diff --git a/CHANGES.rst b/CHANGES.rst
index 4911cfa28..a8b821a2d 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,61 @@
+Changes in synapse v0.25.0 (2017-11-15)
+=======================================
+
+Bug fixes:
+
+* Fix port script (PR #2673)
+
+
+Changes in synapse v0.25.0-rc1 (2017-11-14)
+===========================================
+
+Features:
+
+* Add is_public to groups table to allow for private groups (PR #2582)
+* Add a route for determining who you are (PR #2668) Thanks to @turt2live!
+* Add more features to the password providers (PR #2608, #2610, #2620, #2622,
+  #2623, #2624, #2626, #2628, #2629)
+* Add a hook for custom rest endpoints (PR #2627)
+* Add API to update group room visibility (PR #2651)
+
+
+Changes:
+
+* Ignore <noscript> tags when generating URL preview descriptions (PR #2576)
+  Thanks to @maximevaillancourt!
+* Register some /unstable endpoints in /r0 as well (PR #2579) Thanks to
+  @krombel!
+* Support /keys/upload on /r0 as well as /unstable (PR #2585)
+* Front-end proxy: pass through auth header (PR #2586)
+* Allow ASes to deactivate their own users (PR #2589)
+* Remove refresh tokens (PR #2613)
+* Automatically set default displayname on register (PR #2617)
+* Log login requests (PR #2618)
+* Always return `is_public` in the `/groups/:group_id/rooms` API (PR #2630)
+* Avoid no-op media deletes (PR #2637) Thanks to @spantaleev!
+* Fix various embarrassing typos around user_directory and add some doc. (PR
+  #2643)
+* Return whether a user is an admin within a group (PR #2647)
+* Namespace visibility options for groups (PR #2657)
+* Downcase UserIDs on registration (PR #2662)
+* Cache failures when fetching URL previews (PR #2669)
+
+
+Bug fixes:
+
+* Fix port script (PR #2577)
+* Fix error when running synapse with no logfile (PR #2581)
+* Fix UI auth when deleting devices (PR #2591)
+* Fix typo when checking if user is invited to group (PR #2599)
+* Fix the port script to drop NUL values in all tables (PR #2611)
+* Fix appservices being backlogged and not receiving new events due to a bug in
+  notify_interested_services (PR #2631) Thanks to @xyzz!
+* Fix updating rooms avatar/display name when modified by admin (PR #2636)
+  Thanks to @farialima!
+* Fix bug in state group storage (PR #2649)
+* Fix 500 on invalid utf-8 in request (PR #2663)
+
+
 Changes in synapse v0.24.1 (2017-10-24)
 =======================================
 
diff --git a/README.rst b/README.rst
index 9da8c7f7a..6f146b63b 100644
--- a/README.rst
+++ b/README.rst
@@ -823,7 +823,9 @@ spidering 'internal' URLs on your network.  At the very least we recommend that
 your loopback and RFC1918 IP addresses are blacklisted.
 
 This also requires the optional lxml and netaddr python dependencies to be
-installed.
+installed.  This in turn requires the libxml2 library to be available - on
+Debian/Ubuntu this means ``apt-get install libxml2-dev``, or equivalent for
+your OS.
 
 
 Password reset
diff --git a/docs/code_style.rst b/docs/code_style.rst
index 8d73d17be..9c52cb318 100644
--- a/docs/code_style.rst
+++ b/docs/code_style.rst
@@ -1,52 +1,119 @@
-Basically, PEP8
+- Everything should comply with PEP8. Code should pass
+  ``pep8 --max-line-length=100`` without any warnings.
 
-- NEVER tabs. 4 spaces to indent.
-- Max line width: 79 chars (with flexibility to overflow by a "few chars" if
+- **Indenting**:
+
+  - NEVER tabs. 4 spaces to indent.
+
+  - follow PEP8; either hanging indent or multiline-visual indent depending
+    on the size and shape of the arguments and what makes more sense to the
+    author. In other words, both this::
+
+      print("I am a fish %s" % "moo")
+
+    and this::
+
+      print("I am a fish %s" %
+            "moo")
+
+      and this::
+
+        print(
+            "I am a fish %s" %
+            "moo",
+        )
+
+    ...are valid, although given each one takes up 2x more vertical space than
+    the previous, it's up to the author's discretion as to which layout makes
+    most sense for their function invocation.  (e.g. if they want to add
+    comments per-argument, or put expressions in the arguments, or group
+    related arguments together, or want to deliberately extend or preserve
+    vertical/horizontal space)
+
+- **Line length**:
+
+  Max line length is 79 chars (with flexibility to overflow by a "few chars" if
   the overflowing content is not semantically significant and avoids an
   explosion of vertical whitespace).
-- Use camel case for class and type names
-- Use underscores for functions and variables.
-- Use double quotes.
-- Use parentheses instead of '\\' for line continuation where ever possible
-  (which is pretty much everywhere)
-- There should be max a single new line between:
+
+  Use parentheses instead of ``\`` for line continuation where ever possible
+  (which is pretty much everywhere).
+
+- **Naming**:
+
+  - Use camel case for class and type names
+  - Use underscores for functions and variables.
+
+- Use double quotes ``"foo"`` rather than single quotes ``'foo'``.
+
+- **Blank lines**:
+
+  - There should be max a single new line between:
+
     - statements
     - functions in a class
-- There should be two new lines between:
+
+  - There should be two new lines between:
+
     - definitions in a module (e.g., between different classes)
-- There should be spaces where spaces should be and not where there shouldn't be:
-    - a single space after a comma
-    - a single space before and after for '=' when used as assignment
-    - no spaces before and after for '=' for default values and keyword arguments.
-- Indenting must follow PEP8; either hanging indent or multiline-visual indent
-  depending on the size and shape of the arguments and what makes more sense to
-  the author. In other words, both this::
 
-    print("I am a fish %s" % "moo")
+- **Whitespace**:
 
-  and this::
+  There should be spaces where spaces should be and not where there shouldn't
+  be:
 
-    print("I am a fish %s" %
-          "moo")
+  - a single space after a comma
+  - a single space before and after for '=' when used as assignment
+  - no spaces before and after for '=' for default values and keyword arguments.
 
-  and this::
+- **Comments**: should follow the `google code style
+  <http://google.github.io/styleguide/pyguide.html?showone=Comments#Comments>`_.
+  This is so that we can generate documentation with `sphinx
+  <http://sphinxcontrib-napoleon.readthedocs.org/en/latest/>`_. See the
+  `examples
+  <http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html>`_
+  in the sphinx documentation.
 
-    print(
-        "I am a fish %s" %
-        "moo"
-    )
+- **Imports**:
 
-  ...are valid, although given each one takes up 2x more vertical space than
-  the previous, it's up to the author's discretion as to which layout makes most
-  sense for their function invocation.  (e.g. if they want to add comments
-  per-argument, or put expressions in the arguments, or group related arguments
-  together, or want to deliberately extend or preserve vertical/horizontal
-  space)
+  - Prefer to import classes and functions than packages or modules.
 
-Comments should follow the `google code style <http://google.github.io/styleguide/pyguide.html?showone=Comments#Comments>`_.
-This is so that we can generate documentation with 
-`sphinx <http://sphinxcontrib-napoleon.readthedocs.org/en/latest/>`_. See the
-`examples <http://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html>`_
-in the sphinx documentation.
+    Example::
 
-Code should pass pep8 --max-line-length=100 without any warnings.
+      from synapse.types import UserID
+      ...
+      user_id = UserID(local, server)
+
+    is preferred over::
+
+      from synapse import types
+      ...
+      user_id = types.UserID(local, server)
+
+    (or any other variant).
+
+    This goes against the advice in the Google style guide, but it means that
+    errors in the name are caught early (at import time).
+
+  - Multiple imports from the same package can be combined onto one line::
+
+      from synapse.types import GroupID, RoomID, UserID
+
+    An effort should be made to keep the individual imports in alphabetical
+    order.
+
+    If the list becomes long, wrap it with parentheses and split it over
+    multiple lines.
+
+  - As per `PEP-8 <https://www.python.org/dev/peps/pep-0008/#imports>`_,
+    imports should be grouped in the following order, with a blank line between
+    each group:
+
+    1. standard library imports
+    2. related third party imports
+    3. local application/library specific imports
+
+  - Imports within each group should be sorted alphabetically by module name.
+
+  - Avoid wildcard imports (``from synapse.types import *``) and relative
+    imports (``from .types import UserID``).
diff --git a/docs/password_auth_providers.rst b/docs/password_auth_providers.rst
new file mode 100644
index 000000000..d8a7b61cd
--- /dev/null
+++ b/docs/password_auth_providers.rst
@@ -0,0 +1,99 @@
+Password auth provider modules
+==============================
+
+Password auth providers offer a way for server administrators to integrate
+their Synapse installation with an existing authentication system.
+
+A password auth provider is a Python class which is dynamically loaded into
+Synapse, and provides a number of methods by which it can integrate with the
+authentication system.
+
+This document serves as a reference for those looking to implement their own
+password auth providers.
+
+Required methods
+----------------
+
+Password auth provider classes must provide the following methods:
+
+*class* ``SomeProvider.parse_config``\(*config*)
+
+    This method is passed the ``config`` object for this module from the
+    homeserver configuration file.
+
+    It should perform any appropriate sanity checks on the provided
+    configuration, and return an object which is then passed into ``__init__``.
+
+*class* ``SomeProvider``\(*config*, *account_handler*)
+
+    The constructor is passed the config object returned by ``parse_config``,
+    and a ``synapse.module_api.ModuleApi`` object which allows the
+    password provider to check if accounts exist and/or create new ones.
+
+Optional methods
+----------------
+
+Password auth provider classes may optionally provide the following methods.
+
+*class* ``SomeProvider.get_db_schema_files``\()
+
+    This method, if implemented, should return an Iterable of ``(name,
+    stream)`` pairs of database schema files. Each file is applied in turn at
+    initialisation, and a record is then made in the database so that it is
+    not re-applied on the next start.
+
+``someprovider.get_supported_login_types``\()
+
+    This method, if implemented, should return a ``dict`` mapping from a login
+    type identifier (such as ``m.login.password``) to an iterable giving the
+    fields which must be provided by the user in the submission to the
+    ``/login`` api. These fields are passed in the ``login_dict`` dictionary
+    to ``check_auth``.
+
+    For example, if a password auth provider wants to implement a custom login
+    type of ``com.example.custom_login``, where the client is expected to pass
+    the fields ``secret1`` and ``secret2``, the provider should implement this
+    method and return the following dict::
+
+      {"com.example.custom_login": ("secret1", "secret2")}
+
+``someprovider.check_auth``\(*username*, *login_type*, *login_dict*)
+
+    This method is the one that does the real work. If implemented, it will be
+    called for each login attempt where the login type matches one of the keys
+    returned by ``get_supported_login_types``.
+
+    It is passed the (possibly UNqualified) ``user`` provided by the client,
+    the login type, and a dictionary of login secrets passed by the client.
+
+    The method should return a Twisted ``Deferred`` object, which resolves to
+    the canonical ``@localpart:domain`` user id if authentication is successful,
+    and ``None`` if not.
+
+    Alternatively, the ``Deferred`` can resolve to a ``(str, func)`` tuple, in
+    which case the second field is a callback which will be called with the
+    result from the ``/login`` call (including ``access_token``, ``device_id``,
+    etc.)
+
+``someprovider.check_password``\(*user_id*, *password*)
+
+    This method provides a simpler interface than ``get_supported_login_types``
+    and ``check_auth`` for password auth providers that just want to provide a
+    mechanism for validating ``m.login.password`` logins.
+
+    Iif implemented, it will be called to check logins with an
+    ``m.login.password`` login type. It is passed a qualified
+    ``@localpart:domain`` user id, and the password provided by the user.
+
+    The method should return a Twisted ``Deferred`` object, which resolves to
+    ``True`` if authentication is successful, and ``False`` if not.
+
+``someprovider.on_logged_out``\(*user_id*, *device_id*, *access_token*)
+
+    This method, if implemented, is called when a user logs out. It is passed
+    the qualified user ID, the ID of the deactivated device (if any: access
+    tokens are occasionally created without an associated device ID), and the
+    (now deactivated) access token.
+
+    It may return a Twisted ``Deferred`` object; the logout request will wait
+    for the deferred to complete but the result is ignored.
diff --git a/docs/url_previews.rst b/docs/url_previews.md
similarity index 99%
rename from docs/url_previews.rst
rename to docs/url_previews.md
index 634d9d907..665554e16 100644
--- a/docs/url_previews.rst
+++ b/docs/url_previews.md
@@ -56,6 +56,7 @@ As a first cut, let's do #2 and have the receiver hit the API to calculate its o
 API
 ---
 
+```
 GET /_matrix/media/r0/preview_url?url=http://wherever.com
 200 OK
 {
@@ -66,6 +67,7 @@ GET /_matrix/media/r0/preview_url?url=http://wherever.com
     "og:description" : "“Synapse 0.12 is out! Lots of polishing, performance &amp;amp; bugfixes: /sync API, /r0 prefix, fulltext search, 3PID invites https://t.co/5alhXLLEGP”"
     "og:site_name"   : "Twitter"
 }
+```
 
 * Downloads the URL
   * If HTML, just stores it in RAM and parses it for OG meta tags
diff --git a/docs/user_directory.md b/docs/user_directory.md
new file mode 100644
index 000000000..4c8ee44f3
--- /dev/null
+++ b/docs/user_directory.md
@@ -0,0 +1,17 @@
+User Directory API Implementation
+=================================
+
+The user directory is currently maintained based on the 'visible' users
+on this particular server - i.e. ones which your account shares a room with, or
+who are present in a publicly viewable room present on the server.
+
+The directory info is stored in various tables, which can (typically after
+DB corruption) get stale or out of sync.  If this happens, for now the
+quickest solution to fix it is:
+
+```
+UPDATE user_directory_stream_pos SET stream_id = NULL;
+```
+
+and restart the synapse, which should then start a background task to
+flush the current tables and regenerate the directory.
diff --git a/scripts/synapse_port_db b/scripts/synapse_port_db
index dc7fe940e..d46581e4e 100755
--- a/scripts/synapse_port_db
+++ b/scripts/synapse_port_db
@@ -42,6 +42,14 @@ BOOLEAN_COLUMNS = {
     "public_room_list_stream": ["visibility"],
     "device_lists_outbound_pokes": ["sent"],
     "users_who_share_rooms": ["share_private"],
+    "groups": ["is_public"],
+    "group_rooms": ["is_public"],
+    "group_users": ["is_public", "is_admin"],
+    "group_summary_rooms": ["is_public"],
+    "group_room_categories": ["is_public"],
+    "group_summary_users": ["is_public"],
+    "group_roles": ["is_public"],
+    "local_group_membership": ["is_publicised", "is_admin"],
 }
 
 
@@ -112,6 +120,7 @@ class Store(object):
 
     _simple_update_one = SQLBaseStore.__dict__["_simple_update_one"]
     _simple_update_one_txn = SQLBaseStore.__dict__["_simple_update_one_txn"]
+    _simple_update_txn = SQLBaseStore.__dict__["_simple_update_txn"]
 
     def runInteraction(self, desc, func, *args, **kwargs):
         def r(conn):
@@ -318,7 +327,7 @@ class Porter(object):
                     backward_chunk = min(row[0] for row in brows) - 1
 
                 rows = frows + brows
-                self._convert_rows(table, headers, rows)
+                rows = self._convert_rows(table, headers, rows)
 
                 def insert(txn):
                     self.postgres_store.insert_many_txn(
@@ -554,17 +563,29 @@ class Porter(object):
             i for i, h in enumerate(headers) if h in bool_col_names
         ]
 
+        class BadValueException(Exception):
+            pass
+
         def conv(j, col):
             if j in bool_cols:
                 return bool(col)
+            elif isinstance(col, basestring) and "\0" in col:
+                logger.warn("DROPPING ROW: NUL value in table %s col %s: %r", table, headers[j], col)
+                raise BadValueException();
             return col
 
+        outrows = []
         for i, row in enumerate(rows):
-            rows[i] = tuple(
-                conv(j, col)
-                for j, col in enumerate(row)
-                if j > 0
-            )
+            try:
+                outrows.append(tuple(
+                    conv(j, col)
+                    for j, col in enumerate(row)
+                    if j > 0
+                ))
+            except BadValueException:
+                pass
+
+        return outrows
 
     @defer.inlineCallbacks
     def _setup_sent_transactions(self):
@@ -592,7 +613,7 @@ class Porter(object):
             "select", r,
         )
 
-        self._convert_rows("sent_transactions", headers, rows)
+        rows = self._convert_rows("sent_transactions", headers, rows)
 
         inserted_rows = len(rows)
         if inserted_rows:
diff --git a/synapse/__init__.py b/synapse/__init__.py
index e74abe013..e04208961 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -16,4 +16,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.24.1"
+__version__ = "0.25.0"
diff --git a/synapse/app/frontend_proxy.py b/synapse/app/frontend_proxy.py
index bee4c4749..abc7ef572 100644
--- a/synapse/app/frontend_proxy.py
+++ b/synapse/app/frontend_proxy.py
@@ -50,8 +50,7 @@ logger = logging.getLogger("synapse.app.frontend_proxy")
 
 
 class KeyUploadServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/keys/upload(/(?P<device_id>[^/]+))?$",
-                                  releases=())
+    PATTERNS = client_v2_patterns("/keys/upload(/(?P<device_id>[^/]+))?$")
 
     def __init__(self, hs):
         """
@@ -89,9 +88,16 @@ class KeyUploadServlet(RestServlet):
 
         if body:
             # They're actually trying to upload something, proxy to main synapse.
+            # Pass through the auth headers, if any, in case the access token
+            # is there.
+            auth_headers = request.requestHeaders.getRawHeaders("Authorization", [])
+            headers = {
+                "Authorization": auth_headers,
+            }
             result = yield self.http_client.post_json_get_json(
                 self.main_uri + request.uri,
                 body,
+                headers=headers,
             )
 
             defer.returnValue((200, result))
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index 3adf72e14..9e2614633 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -30,6 +30,8 @@ from synapse.config._base import ConfigError
 from synapse.config.homeserver import HomeServerConfig
 from synapse.crypto import context_factory
 from synapse.federation.transport.server import TransportLayerServer
+from synapse.module_api import ModuleApi
+from synapse.http.additional_resource import AdditionalResource
 from synapse.http.server import RootRedirect
 from synapse.http.site import SynapseSite
 from synapse.metrics import register_memory_metrics
@@ -49,6 +51,7 @@ from synapse.storage.prepare_database import UpgradeDatabaseException, prepare_d
 from synapse.util.httpresourcetree import create_resource_tree
 from synapse.util.logcontext import LoggingContext
 from synapse.util.manhole import manhole
+from synapse.util.module_loader import load_module
 from synapse.util.rlimit import change_resource_limit
 from synapse.util.versionstring import get_version_string
 from twisted.application import service
@@ -107,52 +110,18 @@ class SynapseHomeServer(HomeServer):
         resources = {}
         for res in listener_config["resources"]:
             for name in res["names"]:
-                if name == "client":
-                    client_resource = ClientRestResource(self)
-                    if res["compress"]:
-                        client_resource = gz_wrap(client_resource)
+                resources.update(self._configure_named_resource(
+                    name, res.get("compress", False),
+                ))
 
-                    resources.update({
-                        "/_matrix/client/api/v1": client_resource,
-                        "/_matrix/client/r0": client_resource,
-                        "/_matrix/client/unstable": client_resource,
-                        "/_matrix/client/v2_alpha": client_resource,
-                        "/_matrix/client/versions": client_resource,
-                    })
-
-                if name == "federation":
-                    resources.update({
-                        FEDERATION_PREFIX: TransportLayerServer(self),
-                    })
-
-                if name in ["static", "client"]:
-                    resources.update({
-                        STATIC_PREFIX: File(
-                            os.path.join(os.path.dirname(synapse.__file__), "static")
-                        ),
-                    })
-
-                if name in ["media", "federation", "client"]:
-                    media_repo = MediaRepositoryResource(self)
-                    resources.update({
-                        MEDIA_PREFIX: media_repo,
-                        LEGACY_MEDIA_PREFIX: media_repo,
-                        CONTENT_REPO_PREFIX: ContentRepoResource(
-                            self, self.config.uploads_path
-                        ),
-                    })
-
-                if name in ["keys", "federation"]:
-                    resources.update({
-                        SERVER_KEY_PREFIX: LocalKey(self),
-                        SERVER_KEY_V2_PREFIX: KeyApiV2Resource(self),
-                    })
-
-                if name == "webclient":
-                    resources[WEB_CLIENT_PREFIX] = build_resource_for_web_client(self)
-
-                if name == "metrics" and self.get_config().enable_metrics:
-                    resources[METRICS_PREFIX] = MetricsResource(self)
+        additional_resources = listener_config.get("additional_resources", {})
+        logger.debug("Configuring additional resources: %r",
+                     additional_resources)
+        module_api = ModuleApi(self, self.get_auth_handler())
+        for path, resmodule in additional_resources.items():
+            handler_cls, config = load_module(resmodule)
+            handler = handler_cls(config, module_api)
+            resources[path] = AdditionalResource(self, handler.handle_request)
 
         if WEB_CLIENT_PREFIX in resources:
             root_resource = RootRedirect(WEB_CLIENT_PREFIX)
@@ -188,6 +157,67 @@ class SynapseHomeServer(HomeServer):
                 )
         logger.info("Synapse now listening on port %d", port)
 
+    def _configure_named_resource(self, name, compress=False):
+        """Build a resource map for a named resource
+
+        Args:
+            name (str): named resource: one of "client", "federation", etc
+            compress (bool): whether to enable gzip compression for this
+                resource
+
+        Returns:
+            dict[str, Resource]: map from path to HTTP resource
+        """
+        resources = {}
+        if name == "client":
+            client_resource = ClientRestResource(self)
+            if compress:
+                client_resource = gz_wrap(client_resource)
+
+            resources.update({
+                "/_matrix/client/api/v1": client_resource,
+                "/_matrix/client/r0": client_resource,
+                "/_matrix/client/unstable": client_resource,
+                "/_matrix/client/v2_alpha": client_resource,
+                "/_matrix/client/versions": client_resource,
+            })
+
+        if name == "federation":
+            resources.update({
+                FEDERATION_PREFIX: TransportLayerServer(self),
+            })
+
+        if name in ["static", "client"]:
+            resources.update({
+                STATIC_PREFIX: File(
+                    os.path.join(os.path.dirname(synapse.__file__), "static")
+                ),
+            })
+
+        if name in ["media", "federation", "client"]:
+            media_repo = MediaRepositoryResource(self)
+            resources.update({
+                MEDIA_PREFIX: media_repo,
+                LEGACY_MEDIA_PREFIX: media_repo,
+                CONTENT_REPO_PREFIX: ContentRepoResource(
+                    self, self.config.uploads_path
+                ),
+            })
+
+        if name in ["keys", "federation"]:
+            resources.update({
+                SERVER_KEY_PREFIX: LocalKey(self),
+                SERVER_KEY_V2_PREFIX: KeyApiV2Resource(self),
+            })
+
+        if name == "webclient":
+            resources[WEB_CLIENT_PREFIX] = build_resource_for_web_client(self)
+
+        if name == "metrics" and self.get_config().enable_metrics:
+            resources[METRICS_PREFIX] = MetricsResource(self)
+
+        return resources
+
     def start_listening(self):
         config = self.get_config()
 
diff --git a/synapse/appservice/api.py b/synapse/appservice/api.py
index 6893610e7..40c433d7a 100644
--- a/synapse/appservice/api.py
+++ b/synapse/appservice/api.py
@@ -18,6 +18,7 @@ from synapse.api.constants import ThirdPartyEntityKind
 from synapse.api.errors import CodeMessageException
 from synapse.http.client import SimpleHttpClient
 from synapse.events.utils import serialize_event
+from synapse.util.logcontext import preserve_fn, make_deferred_yieldable
 from synapse.util.caches.response_cache import ResponseCache
 from synapse.types import ThirdPartyInstanceID
 
@@ -192,9 +193,12 @@ class ApplicationServiceApi(SimpleHttpClient):
                 defer.returnValue(None)
 
         key = (service.id, protocol)
-        return self.protocol_meta_cache.get(key) or (
-            self.protocol_meta_cache.set(key, _get())
-        )
+        result = self.protocol_meta_cache.get(key)
+        if not result:
+            result = self.protocol_meta_cache.set(
+                key, preserve_fn(_get)()
+            )
+        return make_deferred_yieldable(result)
 
     @defer.inlineCallbacks
     def push_bulk(self, service, events, txn_id=None):
diff --git a/synapse/config/cas.py b/synapse/config/cas.py
index 938f6f25f..8109e5f95 100644
--- a/synapse/config/cas.py
+++ b/synapse/config/cas.py
@@ -41,7 +41,7 @@ class CasConfig(Config):
         #cas_config:
         #   enabled: true
         #   server_url: "https://cas-server.com"
-        #   service_url: "https://homesever.domain.com:8448"
+        #   service_url: "https://homeserver.domain.com:8448"
         #   #required_attributes:
         #   #    name: value
         """
diff --git a/synapse/config/logger.py b/synapse/config/logger.py
index 2dbeafa9d..a1d6e4d4f 100644
--- a/synapse/config/logger.py
+++ b/synapse/config/logger.py
@@ -148,8 +148,8 @@ def setup_logging(config, use_worker_options=False):
         "%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s"
         " - %(message)s"
     )
-    if log_config is None:
 
+    if log_config is None:
         level = logging.INFO
         level_for_storage = logging.INFO
         if config.verbosity:
@@ -176,6 +176,10 @@ def setup_logging(config, use_worker_options=False):
                 logger.info("Opened new log file due to SIGHUP")
         else:
             handler = logging.StreamHandler()
+
+            def sighup(signum, stack):
+                pass
+
         handler.setFormatter(formatter)
 
         handler.addFilter(LoggingContextFilter(request=""))
diff --git a/synapse/config/password_auth_providers.py b/synapse/config/password_auth_providers.py
index 90824cab7..e9828fac1 100644
--- a/synapse/config/password_auth_providers.py
+++ b/synapse/config/password_auth_providers.py
@@ -13,41 +13,40 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ._base import Config, ConfigError
+from ._base import Config
 
 from synapse.util.module_loader import load_module
 
+LDAP_PROVIDER = 'ldap_auth_provider.LdapAuthProvider'
+
 
 class PasswordAuthProviderConfig(Config):
     def read_config(self, config):
         self.password_providers = []
-
-        provider_config = None
+        providers = []
 
         # We want to be backwards compatible with the old `ldap_config`
         # param.
         ldap_config = config.get("ldap_config", {})
-        self.ldap_enabled = ldap_config.get("enabled", False)
-        if self.ldap_enabled:
-            from ldap_auth_provider import LdapAuthProvider
-            parsed_config = LdapAuthProvider.parse_config(ldap_config)
-            self.password_providers.append((LdapAuthProvider, parsed_config))
+        if ldap_config.get("enabled", False):
+            providers.append[{
+                'module': LDAP_PROVIDER,
+                'config': ldap_config,
+            }]
 
-        providers = config.get("password_providers", [])
+        providers.extend(config.get("password_providers", []))
         for provider in providers:
+            mod_name = provider['module']
+
             # This is for backwards compat when the ldap auth provider resided
             # in this package.
-            if provider['module'] == "synapse.util.ldap_auth_provider.LdapAuthProvider":
-                from ldap_auth_provider import LdapAuthProvider
-                provider_class = LdapAuthProvider
-                try:
-                    provider_config = provider_class.parse_config(provider["config"])
-                except Exception as e:
-                    raise ConfigError(
-                        "Failed to parse config for %r: %r" % (provider['module'], e)
-                    )
-            else:
-                (provider_class, provider_config) = load_module(provider)
+            if mod_name == "synapse.util.ldap_auth_provider.LdapAuthProvider":
+                mod_name = LDAP_PROVIDER
+
+            (provider_class, provider_config) = load_module({
+                "module": mod_name,
+                "config": provider['config'],
+            })
 
             self.password_providers.append((provider_class, provider_config))
 
diff --git a/synapse/config/server.py b/synapse/config/server.py
index b66993dab..4d9193536 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -247,6 +247,13 @@ class ServerConfig(Config):
               - names: [federation]  # Federation APIs
                 compress: false
 
+            # optional list of additional endpoints which can be loaded via
+            # dynamic modules
+            # additional_resources:
+            #   "/_matrix/my/custom/endpoint":
+            #     module: my_module.CustomRequestHandler
+            #     config: {}
+
           # Unsecure HTTP listener,
           # For when matrix traffic passes through loadbalancer that unwraps TLS.
           - port: %(unsecure_port)s
diff --git a/synapse/config/tls.py b/synapse/config/tls.py
index 247f18f45..4748f71c2 100644
--- a/synapse/config/tls.py
+++ b/synapse/config/tls.py
@@ -109,6 +109,12 @@ class TlsConfig(Config):
         # key. It may be necessary to publish the fingerprints of a new
         # certificate and wait until the "valid_until_ts" of the previous key
         # responses have passed before deploying it.
+        #
+        # You can calculate a fingerprint from a given TLS listener via:
+        # openssl s_client -connect $host:$port < /dev/null 2> /dev/null |
+        #   openssl x509 -outform DER | openssl sha256 -binary | base64 | tr -d '='
+        # or by checking matrix.org/federationtester/api/report?server_name=$host
+        #
         tls_fingerprints: []
         # tls_fingerprints: [{"sha256": "<base64_encoded_sha256_fingerprint>"}]
         """ % locals()
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index e15228e70..a2327f24b 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -18,6 +18,7 @@ from .federation_base import FederationBase
 from .units import Transaction, Edu
 
 from synapse.util import async
+from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
 from synapse.util.logutils import log_function
 from synapse.util.caches.response_cache import ResponseCache
 from synapse.events import FrozenEvent
@@ -253,12 +254,13 @@ class FederationServer(FederationBase):
         result = self._state_resp_cache.get((room_id, event_id))
         if not result:
             with (yield self._server_linearizer.queue((origin, room_id))):
-                resp = yield self._state_resp_cache.set(
+                d = self._state_resp_cache.set(
                     (room_id, event_id),
-                    self._on_context_state_request_compute(room_id, event_id)
+                    preserve_fn(self._on_context_state_request_compute)(room_id, event_id)
                 )
+                resp = yield make_deferred_yieldable(d)
         else:
-            resp = yield result
+            resp = yield make_deferred_yieldable(result)
 
         defer.returnValue((200, resp))
 
diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index d25ae1b28..1f3ce238f 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -545,6 +545,20 @@ class TransportLayerClient(object):
             ignore_backoff=True,
         )
 
+    def update_room_in_group(self, destination, group_id, requester_user_id, room_id,
+                             config_key, content):
+        """Update room in group
+        """
+        path = PREFIX + "/groups/%s/room/%s/config/%s" % (group_id, room_id, config_key,)
+
+        return self.client.post_json(
+            destination=destination,
+            path=path,
+            args={"requester_user_id": requester_user_id},
+            data=content,
+            ignore_backoff=True,
+        )
+
     def remove_room_from_group(self, destination, group_id, requester_user_id, room_id):
         """Remove a room from a group
         """
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index 8f3c14c30..2b02b021e 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -676,7 +676,7 @@ class FederationGroupsRoomsServlet(BaseFederationServlet):
 class FederationGroupsAddRoomsServlet(BaseFederationServlet):
     """Add/remove room from group
     """
-    PATH = "/groups/(?P<group_id>[^/]*)/room/(?<room_id>)$"
+    PATH = "/groups/(?P<group_id>[^/]*)/room/(?P<room_id>[^/]*)$"
 
     @defer.inlineCallbacks
     def on_POST(self, origin, content, query, group_id, room_id):
@@ -703,6 +703,27 @@ class FederationGroupsAddRoomsServlet(BaseFederationServlet):
         defer.returnValue((200, new_content))
 
 
+class FederationGroupsAddRoomsConfigServlet(BaseFederationServlet):
+    """Update room config in group
+    """
+    PATH = (
+        "/groups/(?P<group_id>[^/]*)/room/(?P<room_id>[^/]*)"
+        "/config/(?P<config_key>[^/]*)$"
+    )
+
+    @defer.inlineCallbacks
+    def on_POST(self, origin, content, query, group_id, room_id, config_key):
+        requester_user_id = parse_string_from_args(query, "requester_user_id")
+        if get_domain_from_id(requester_user_id) != origin:
+            raise SynapseError(403, "requester_user_id doesn't match origin")
+
+        result = yield self.groups_handler.update_room_in_group(
+            group_id, requester_user_id, room_id, config_key, content,
+        )
+
+        defer.returnValue((200, result))
+
+
 class FederationGroupsUsersServlet(BaseFederationServlet):
     """Get the users in a group on behalf of a user
     """
@@ -1142,6 +1163,8 @@ GROUP_SERVER_SERVLET_CLASSES = (
     FederationGroupsRolesServlet,
     FederationGroupsRoleServlet,
     FederationGroupsSummaryUsersServlet,
+    FederationGroupsAddRoomsServlet,
+    FederationGroupsAddRoomsConfigServlet,
 )
 
 
diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py
index b751cf5e4..1fb709e6c 100644
--- a/synapse/groups/attestations.py
+++ b/synapse/groups/attestations.py
@@ -13,6 +13,31 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+"""Attestations ensure that users and groups can't lie about their memberships.
+
+When a user joins a group the HS and GS swap attestations, which allow them
+both to independently prove to third parties their membership.These
+attestations have a validity period so need to be periodically renewed.
+
+If a user leaves (or gets kicked out of) a group, either side can still use
+their attestation to "prove" their membership, until the attestation expires.
+Therefore attestations shouldn't be relied on to prove membership in important
+cases, but can for less important situtations, e.g. showing a users membership
+of groups on their profile, showing flairs, etc.abs
+
+An attestsation is a signed blob of json that looks like:
+
+    {
+        "user_id": "@foo:a.example.com",
+        "group_id": "+bar:b.example.com",
+        "valid_until_ms": 1507994728530,
+        "signatures":{"matrix.org":{"ed25519:auto":"..."}}
+    }
+"""
+
+import logging
+import random
+
 from twisted.internet import defer
 
 from synapse.api.errors import SynapseError
@@ -22,9 +47,17 @@ from synapse.util.logcontext import preserve_fn
 from signedjson.sign import sign_json
 
 
+logger = logging.getLogger(__name__)
+
+
 # Default validity duration for new attestations we create
 DEFAULT_ATTESTATION_LENGTH_MS = 3 * 24 * 60 * 60 * 1000
 
+# We add some jitter to the validity duration of attestations so that if we
+# add lots of users at once we don't need to renew them all at once.
+# The jitter is a multiplier picked randomly between the first and second number
+DEFAULT_ATTESTATION_JITTER = (0.9, 1.3)
+
 # Start trying to update our attestations when they come this close to expiring
 UPDATE_ATTESTATION_TIME_MS = 1 * 24 * 60 * 60 * 1000
 
@@ -73,10 +106,14 @@ class GroupAttestationSigning(object):
         """Create an attestation for the group_id and user_id with default
         validity length.
         """
+        validity_period = DEFAULT_ATTESTATION_LENGTH_MS
+        validity_period *= random.uniform(*DEFAULT_ATTESTATION_JITTER)
+        valid_until_ms = int(self.clock.time_msec() + validity_period)
+
         return sign_json({
             "group_id": group_id,
             "user_id": user_id,
-            "valid_until_ms": self.clock.time_msec() + DEFAULT_ATTESTATION_LENGTH_MS,
+            "valid_until_ms": valid_until_ms,
         }, self.server_name, self.signing_key)
 
 
@@ -128,12 +165,19 @@ class GroupAttestionRenewer(object):
 
         @defer.inlineCallbacks
         def _renew_attestation(group_id, user_id):
-            attestation = self.attestations.create_attestation(group_id, user_id)
-
-            if self.is_mine_id(group_id):
+            if not self.is_mine_id(group_id):
+                destination = get_domain_from_id(group_id)
+            elif not self.is_mine_id(user_id):
                 destination = get_domain_from_id(user_id)
             else:
-                destination = get_domain_from_id(group_id)
+                logger.warn(
+                    "Incorrectly trying to do attestations for user: %r in %r",
+                    user_id, group_id,
+                )
+                yield self.store.remove_attestation_renewal(group_id, user_id)
+                return
+
+            attestation = self.attestations.create_attestation(group_id, user_id)
 
             yield self.transport_client.renew_group_attestation(
                 destination, group_id, user_id,
diff --git a/synapse/groups/groups_server.py b/synapse/groups/groups_server.py
index 23beb3187..0b995aed7 100644
--- a/synapse/groups/groups_server.py
+++ b/synapse/groups/groups_server.py
@@ -49,7 +49,8 @@ class GroupsServerHandler(object):
         hs.get_groups_attestation_renewer()
 
     @defer.inlineCallbacks
-    def check_group_is_ours(self, group_id, and_exists=False, and_is_admin=None):
+    def check_group_is_ours(self, group_id, requester_user_id,
+                            and_exists=False, and_is_admin=None):
         """Check that the group is ours, and optionally if it exists.
 
         If group does exist then return group.
@@ -67,6 +68,10 @@ class GroupsServerHandler(object):
         if and_exists and not group:
             raise SynapseError(404, "Unknown group")
 
+        is_user_in_group = yield self.store.is_user_in_group(requester_user_id, group_id)
+        if group and not is_user_in_group and not group["is_public"]:
+            raise SynapseError(404, "Unknown group")
+
         if and_is_admin:
             is_admin = yield self.store.is_user_admin_in_group(group_id, and_is_admin)
             if not is_admin:
@@ -84,7 +89,7 @@ class GroupsServerHandler(object):
 
         A user/room may appear in multiple roles/categories.
         """
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         is_user_in_group = yield self.store.is_user_in_group(requester_user_id, group_id)
 
@@ -153,10 +158,16 @@ class GroupsServerHandler(object):
         })
 
     @defer.inlineCallbacks
-    def update_group_summary_room(self, group_id, user_id, room_id, category_id, content):
+    def update_group_summary_room(self, group_id, requester_user_id,
+                                  room_id, category_id, content):
         """Add/update a room to the group summary
         """
-        yield self.check_group_is_ours(group_id, and_exists=True, and_is_admin=user_id)
+        yield self.check_group_is_ours(
+            group_id,
+            requester_user_id,
+            and_exists=True,
+            and_is_admin=requester_user_id,
+        )
 
         RoomID.from_string(room_id)  # Ensure valid room id
 
@@ -175,10 +186,16 @@ class GroupsServerHandler(object):
         defer.returnValue({})
 
     @defer.inlineCallbacks
-    def delete_group_summary_room(self, group_id, user_id, room_id, category_id):
+    def delete_group_summary_room(self, group_id, requester_user_id,
+                                  room_id, category_id):
         """Remove a room from the summary
         """
-        yield self.check_group_is_ours(group_id, and_exists=True, and_is_admin=user_id)
+        yield self.check_group_is_ours(
+            group_id,
+            requester_user_id,
+            and_exists=True,
+            and_is_admin=requester_user_id,
+        )
 
         yield self.store.remove_room_from_summary(
             group_id=group_id,
@@ -189,10 +206,10 @@ class GroupsServerHandler(object):
         defer.returnValue({})
 
     @defer.inlineCallbacks
-    def get_group_categories(self, group_id, user_id):
+    def get_group_categories(self, group_id, requester_user_id):
         """Get all categories in a group (as seen by user)
         """
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         categories = yield self.store.get_group_categories(
             group_id=group_id,
@@ -200,10 +217,10 @@ class GroupsServerHandler(object):
         defer.returnValue({"categories": categories})
 
     @defer.inlineCallbacks
-    def get_group_category(self, group_id, user_id, category_id):
+    def get_group_category(self, group_id, requester_user_id, category_id):
         """Get a specific category in a group (as seen by user)
         """
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         res = yield self.store.get_group_category(
             group_id=group_id,
@@ -213,10 +230,15 @@ class GroupsServerHandler(object):
         defer.returnValue(res)
 
     @defer.inlineCallbacks
-    def update_group_category(self, group_id, user_id, category_id, content):
+    def update_group_category(self, group_id, requester_user_id, category_id, content):
         """Add/Update a group category
         """
-        yield self.check_group_is_ours(group_id, and_exists=True, and_is_admin=user_id)
+        yield self.check_group_is_ours(
+            group_id,
+            requester_user_id,
+            and_exists=True,
+            and_is_admin=requester_user_id,
+        )
 
         is_public = _parse_visibility_from_contents(content)
         profile = content.get("profile")
@@ -231,10 +253,15 @@ class GroupsServerHandler(object):
         defer.returnValue({})
 
     @defer.inlineCallbacks
-    def delete_group_category(self, group_id, user_id, category_id):
+    def delete_group_category(self, group_id, requester_user_id, category_id):
         """Delete a group category
         """
-        yield self.check_group_is_ours(group_id, and_exists=True, and_is_admin=user_id)
+        yield self.check_group_is_ours(
+            group_id,
+            requester_user_id,
+            and_exists=True,
+            and_is_admin=requester_user_id
+        )
 
         yield self.store.remove_group_category(
             group_id=group_id,
@@ -244,10 +271,10 @@ class GroupsServerHandler(object):
         defer.returnValue({})
 
     @defer.inlineCallbacks
-    def get_group_roles(self, group_id, user_id):
+    def get_group_roles(self, group_id, requester_user_id):
         """Get all roles in a group (as seen by user)
         """
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         roles = yield self.store.get_group_roles(
             group_id=group_id,
@@ -255,10 +282,10 @@ class GroupsServerHandler(object):
         defer.returnValue({"roles": roles})
 
     @defer.inlineCallbacks
-    def get_group_role(self, group_id, user_id, role_id):
+    def get_group_role(self, group_id, requester_user_id, role_id):
         """Get a specific role in a group (as seen by user)
         """
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         res = yield self.store.get_group_role(
             group_id=group_id,
@@ -267,10 +294,15 @@ class GroupsServerHandler(object):
         defer.returnValue(res)
 
     @defer.inlineCallbacks
-    def update_group_role(self, group_id, user_id, role_id, content):
+    def update_group_role(self, group_id, requester_user_id, role_id, content):
         """Add/update a role in a group
         """
-        yield self.check_group_is_ours(group_id, and_exists=True, and_is_admin=user_id)
+        yield self.check_group_is_ours(
+            group_id,
+            requester_user_id,
+            and_exists=True,
+            and_is_admin=requester_user_id,
+        )
 
         is_public = _parse_visibility_from_contents(content)
 
@@ -286,10 +318,15 @@ class GroupsServerHandler(object):
         defer.returnValue({})
 
     @defer.inlineCallbacks
-    def delete_group_role(self, group_id, user_id, role_id):
+    def delete_group_role(self, group_id, requester_user_id, role_id):
         """Remove role from group
         """
-        yield self.check_group_is_ours(group_id, and_exists=True, and_is_admin=user_id)
+        yield self.check_group_is_ours(
+            group_id,
+            requester_user_id,
+            and_exists=True,
+            and_is_admin=requester_user_id,
+        )
 
         yield self.store.remove_group_role(
             group_id=group_id,
@@ -304,7 +341,7 @@ class GroupsServerHandler(object):
         """Add/update a users entry in the group summary
         """
         yield self.check_group_is_ours(
-            group_id, and_exists=True, and_is_admin=requester_user_id,
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id,
         )
 
         order = content.get("order", None)
@@ -326,7 +363,7 @@ class GroupsServerHandler(object):
         """Remove a user from the group summary
         """
         yield self.check_group_is_ours(
-            group_id, and_exists=True, and_is_admin=requester_user_id,
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id,
         )
 
         yield self.store.remove_user_from_summary(
@@ -342,7 +379,7 @@ class GroupsServerHandler(object):
         """Get the group profile as seen by requester_user_id
         """
 
-        yield self.check_group_is_ours(group_id)
+        yield self.check_group_is_ours(group_id, requester_user_id)
 
         group_description = yield self.store.get_group(group_id)
 
@@ -356,7 +393,7 @@ class GroupsServerHandler(object):
         """Update the group profile
         """
         yield self.check_group_is_ours(
-            group_id, and_exists=True, and_is_admin=requester_user_id,
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id,
         )
 
         profile = {}
@@ -377,7 +414,7 @@ class GroupsServerHandler(object):
         The ordering is arbitrary at the moment
         """
 
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         is_user_in_group = yield self.store.is_user_in_group(requester_user_id, group_id)
 
@@ -389,14 +426,15 @@ class GroupsServerHandler(object):
         for user_result in user_results:
             g_user_id = user_result["user_id"]
             is_public = user_result["is_public"]
+            is_privileged = user_result["is_admin"]
 
             entry = {"user_id": g_user_id}
 
             profile = yield self.profile_handler.get_profile_from_cache(g_user_id)
             entry.update(profile)
 
-            if not is_public:
-                entry["is_public"] = False
+            entry["is_public"] = bool(is_public)
+            entry["is_privileged"] = bool(is_privileged)
 
             if not self.is_mine_id(g_user_id):
                 attestation = yield self.store.get_remote_attestation(group_id, g_user_id)
@@ -425,7 +463,7 @@ class GroupsServerHandler(object):
         The ordering is arbitrary at the moment
         """
 
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         is_user_in_group = yield self.store.is_user_in_group(requester_user_id, group_id)
 
@@ -459,7 +497,7 @@ class GroupsServerHandler(object):
         This returns rooms in order of decreasing number of joined users
         """
 
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         is_user_in_group = yield self.store.is_user_in_group(requester_user_id, group_id)
 
@@ -470,7 +508,6 @@ class GroupsServerHandler(object):
         chunk = []
         for room_result in room_results:
             room_id = room_result["room_id"]
-            is_public = room_result["is_public"]
 
             joined_users = yield self.store.get_users_in_room(room_id)
             entry = yield self.room_list_handler.generate_room_entry(
@@ -481,8 +518,7 @@ class GroupsServerHandler(object):
             if not entry:
                 continue
 
-            if not is_public:
-                entry["is_public"] = False
+            entry["is_public"] = bool(room_result["is_public"])
 
             chunk.append(entry)
 
@@ -500,7 +536,7 @@ class GroupsServerHandler(object):
         RoomID.from_string(room_id)  # Ensure valid room id
 
         yield self.check_group_is_ours(
-            group_id, and_exists=True, and_is_admin=requester_user_id
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id
         )
 
         is_public = _parse_visibility_from_contents(content)
@@ -509,12 +545,35 @@ class GroupsServerHandler(object):
 
         defer.returnValue({})
 
+    @defer.inlineCallbacks
+    def update_room_in_group(self, group_id, requester_user_id, room_id, config_key,
+                             content):
+        """Update room in group
+        """
+        RoomID.from_string(room_id)  # Ensure valid room id
+
+        yield self.check_group_is_ours(
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id
+        )
+
+        if config_key == "m.visibility":
+            is_public = _parse_visibility_dict(content)
+
+            yield self.store.update_room_in_group_visibility(
+                group_id, room_id,
+                is_public=is_public,
+            )
+        else:
+            raise SynapseError(400, "Uknown config option")
+
+        defer.returnValue({})
+
     @defer.inlineCallbacks
     def remove_room_from_group(self, group_id, requester_user_id, room_id):
         """Remove room from group
         """
         yield self.check_group_is_ours(
-            group_id, and_exists=True, and_is_admin=requester_user_id
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id
         )
 
         yield self.store.remove_room_from_group(group_id, room_id)
@@ -527,7 +586,7 @@ class GroupsServerHandler(object):
         """
 
         group = yield self.check_group_is_ours(
-            group_id, and_exists=True, and_is_admin=requester_user_id
+            group_id, requester_user_id, and_exists=True, and_is_admin=requester_user_id
         )
 
         # TODO: Check if user knocked
@@ -596,35 +655,40 @@ class GroupsServerHandler(object):
             raise SynapseError(502, "Unknown state returned by HS")
 
     @defer.inlineCallbacks
-    def accept_invite(self, group_id, user_id, content):
+    def accept_invite(self, group_id, requester_user_id, content):
         """User tries to accept an invite to the group.
 
         This is different from them asking to join, and so should error if no
         invite exists (and they're not a member of the group)
         """
 
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
-        if not self.store.is_user_invited_to_local_group(group_id, user_id):
+        is_invited = yield self.store.is_user_invited_to_local_group(
+            group_id, requester_user_id,
+        )
+        if not is_invited:
             raise SynapseError(403, "User not invited to group")
 
-        if not self.hs.is_mine_id(user_id):
+        if not self.hs.is_mine_id(requester_user_id):
+            local_attestation = self.attestations.create_attestation(
+                group_id, requester_user_id,
+            )
             remote_attestation = content["attestation"]
 
             yield self.attestations.verify_attestation(
                 remote_attestation,
-                user_id=user_id,
+                user_id=requester_user_id,
                 group_id=group_id,
             )
         else:
+            local_attestation = None
             remote_attestation = None
 
-        local_attestation = self.attestations.create_attestation(group_id, user_id)
-
         is_public = _parse_visibility_from_contents(content)
 
         yield self.store.add_user_to_group(
-            group_id, user_id,
+            group_id, requester_user_id,
             is_admin=False,
             is_public=is_public,
             local_attestation=local_attestation,
@@ -637,31 +701,31 @@ class GroupsServerHandler(object):
         })
 
     @defer.inlineCallbacks
-    def knock(self, group_id, user_id, content):
+    def knock(self, group_id, requester_user_id, content):
         """A user requests becoming a member of the group
         """
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         raise NotImplementedError()
 
     @defer.inlineCallbacks
-    def accept_knock(self, group_id, user_id, content):
+    def accept_knock(self, group_id, requester_user_id, content):
         """Accept a users knock to the room.
 
         Errors if the user hasn't knocked, rather than inviting them.
         """
 
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         raise NotImplementedError()
 
     @defer.inlineCallbacks
     def remove_user_from_group(self, group_id, user_id, requester_user_id, content):
-        """Remove a user from the group; either a user is leaving or and admin
-        kicked htem.
+        """Remove a user from the group; either a user is leaving or an admin
+        kicked them.
         """
 
-        yield self.check_group_is_ours(group_id, and_exists=True)
+        yield self.check_group_is_ours(group_id, requester_user_id, and_exists=True)
 
         is_kick = False
         if requester_user_id != user_id:
@@ -692,8 +756,8 @@ class GroupsServerHandler(object):
         defer.returnValue({})
 
     @defer.inlineCallbacks
-    def create_group(self, group_id, user_id, content):
-        group = yield self.check_group_is_ours(group_id)
+    def create_group(self, group_id, requester_user_id, content):
+        group = yield self.check_group_is_ours(group_id, requester_user_id)
 
         logger.info("Attempting to create group with ID: %r", group_id)
 
@@ -703,11 +767,11 @@ class GroupsServerHandler(object):
         if group:
             raise SynapseError(400, "Group already exists")
 
-        is_admin = yield self.auth.is_server_admin(UserID.from_string(user_id))
+        is_admin = yield self.auth.is_server_admin(UserID.from_string(requester_user_id))
         if not is_admin:
             if not self.hs.config.enable_group_creation:
                 raise SynapseError(
-                    403, "Only server admin can create group on this server",
+                    403, "Only a server admin can create groups on this server",
                 )
             localpart = group_id_obj.localpart
             if not localpart.startswith(self.hs.config.group_creation_prefix):
@@ -727,38 +791,41 @@ class GroupsServerHandler(object):
 
         yield self.store.create_group(
             group_id,
-            user_id,
+            requester_user_id,
             name=name,
             avatar_url=avatar_url,
             short_description=short_description,
             long_description=long_description,
         )
 
-        if not self.hs.is_mine_id(user_id):
+        if not self.hs.is_mine_id(requester_user_id):
             remote_attestation = content["attestation"]
 
             yield self.attestations.verify_attestation(
                 remote_attestation,
-                user_id=user_id,
+                user_id=requester_user_id,
                 group_id=group_id,
             )
 
-            local_attestation = self.attestations.create_attestation(group_id, user_id)
+            local_attestation = self.attestations.create_attestation(
+                group_id,
+                requester_user_id,
+            )
         else:
             local_attestation = None
             remote_attestation = None
 
         yield self.store.add_user_to_group(
-            group_id, user_id,
+            group_id, requester_user_id,
             is_admin=True,
             is_public=True,  # TODO
             local_attestation=local_attestation,
             remote_attestation=remote_attestation,
         )
 
-        if not self.hs.is_mine_id(user_id):
+        if not self.hs.is_mine_id(requester_user_id):
             yield self.store.add_remote_profile_cache(
-                user_id,
+                requester_user_id,
                 displayname=user_profile.get("displayname"),
                 avatar_url=user_profile.get("avatar_url"),
             )
@@ -773,15 +840,25 @@ def _parse_visibility_from_contents(content):
     public or not
     """
 
-    visibility = content.get("visibility")
+    visibility = content.get("m.visibility")
     if visibility:
-        vis_type = visibility["type"]
-        if vis_type not in ("public", "private"):
-            raise SynapseError(
-                400, "Synapse only supports 'public'/'private' visibility"
-            )
-        is_public = vis_type == "public"
+        return _parse_visibility_dict(visibility)
     else:
         is_public = True
 
     return is_public
+
+
+def _parse_visibility_dict(visibility):
+    """Given a dict for the "m.visibility" config return if the entity should
+    be public or not
+    """
+    vis_type = visibility.get("type")
+    if not vis_type:
+        return True
+
+    if vis_type not in ("public", "private"):
+        raise SynapseError(
+            400, "Synapse only supports 'public'/'private' visibility"
+        )
+    return vis_type == "public"
diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index 05af54d31..543bf28ae 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -70,11 +70,10 @@ class ApplicationServicesHandler(object):
         with Measure(self.clock, "notify_interested_services"):
             self.is_processing = True
             try:
-                upper_bound = self.current_max
                 limit = 100
                 while True:
                     upper_bound, events = yield self.store.get_new_events_for_appservice(
-                        upper_bound, limit
+                        self.current_max, limit
                     )
 
                     if not events:
@@ -105,9 +104,6 @@ class ApplicationServicesHandler(object):
                             )
 
                     yield self.store.set_appservice_last_pos(upper_bound)
-
-                    if len(events) < limit:
-                        break
             finally:
                 self.is_processing = False
 
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 9cef9d184..7a0ba6ef3 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -13,13 +13,13 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 from twisted.internet import defer
 
 from ._base import BaseHandler
 from synapse.api.constants import LoginType
-from synapse.types import UserID
 from synapse.api.errors import AuthError, LoginError, Codes, StoreError, SynapseError
+from synapse.module_api import ModuleApi
+from synapse.types import UserID
 from synapse.util.async import run_on_reactor
 from synapse.util.caches.expiringcache import ExpiringCache
 
@@ -63,10 +63,7 @@ class AuthHandler(BaseHandler):
             reset_expiry_on_get=True,
         )
 
-        account_handler = _AccountHandler(
-            hs, check_user_exists=self.check_user_exists
-        )
-
+        account_handler = ModuleApi(hs, self)
         self.password_providers = [
             module(config=config, account_handler=account_handler)
             for module, config in hs.config.password_providers
@@ -75,14 +72,24 @@ class AuthHandler(BaseHandler):
         logger.info("Extra password_providers: %r", self.password_providers)
 
         self.hs = hs  # FIXME better possibility to access registrationHandler later?
-        self.device_handler = hs.get_device_handler()
         self.macaroon_gen = hs.get_macaroon_generator()
+        self._password_enabled = hs.config.password_enabled
+
+        login_types = set()
+        if self._password_enabled:
+            login_types.add(LoginType.PASSWORD)
+        for provider in self.password_providers:
+            if hasattr(provider, "get_supported_login_types"):
+                login_types.update(
+                    provider.get_supported_login_types().keys()
+                )
+        self._supported_login_types = frozenset(login_types)
 
     @defer.inlineCallbacks
     def check_auth(self, flows, clientdict, clientip):
         """
         Takes a dictionary sent by the client in the login / registration
-        protocol and handles the login flow.
+        protocol and handles the User-Interactive Auth flow.
 
         As a side effect, this function fills in the 'creds' key on the user's
         session with a map, which maps each auth-type (str) to the relevant
@@ -260,16 +267,19 @@ class AuthHandler(BaseHandler):
         sess = self._get_session_info(session_id)
         return sess.setdefault('serverdict', {}).get(key, default)
 
+    @defer.inlineCallbacks
     def _check_password_auth(self, authdict, _):
         if "user" not in authdict or "password" not in authdict:
             raise LoginError(400, "", Codes.MISSING_PARAM)
 
         user_id = authdict["user"]
         password = authdict["password"]
-        if not user_id.startswith('@'):
-            user_id = UserID(user_id, self.hs.hostname).to_string()
 
-        return self._check_password(user_id, password)
+        (canonical_id, callback) = yield self.validate_login(user_id, {
+            "type": LoginType.PASSWORD,
+            "password": password,
+        })
+        defer.returnValue(canonical_id)
 
     @defer.inlineCallbacks
     def _check_recaptcha(self, authdict, clientip):
@@ -398,26 +408,8 @@ class AuthHandler(BaseHandler):
 
         return self.sessions[session_id]
 
-    def validate_password_login(self, user_id, password):
-        """
-        Authenticates the user with their username and password.
-
-        Used only by the v1 login API.
-
-        Args:
-            user_id (str): complete @user:id
-            password (str): Password
-        Returns:
-            defer.Deferred: (str) canonical user id
-        Raises:
-            StoreError if there was a problem accessing the database
-            LoginError if there was an authentication problem.
-        """
-        return self._check_password(user_id, password)
-
     @defer.inlineCallbacks
-    def get_access_token_for_user_id(self, user_id, device_id=None,
-                                     initial_display_name=None):
+    def get_access_token_for_user_id(self, user_id, device_id=None):
         """
         Creates a new access token for the user with the given user ID.
 
@@ -431,13 +423,10 @@ class AuthHandler(BaseHandler):
             device_id (str|None): the device ID to associate with the tokens.
                None to leave the tokens unassociated with a device (deprecated:
                we should always have a device ID)
-            initial_display_name (str): display name to associate with the
-               device if it needs re-registering
         Returns:
               The access token for the user's session.
         Raises:
             StoreError if there was a problem storing the token.
-            LoginError if there was an authentication problem.
         """
         logger.info("Logging in user %s on device %s", user_id, device_id)
         access_token = yield self.issue_access_token(user_id, device_id)
@@ -447,9 +436,11 @@ class AuthHandler(BaseHandler):
         # really don't want is active access_tokens without a record of the
         # device, so we double-check it here.
         if device_id is not None:
-            yield self.device_handler.check_device_registered(
-                user_id, device_id, initial_display_name
-            )
+            try:
+                yield self.store.get_device(user_id, device_id)
+            except StoreError:
+                yield self.store.delete_access_token(access_token)
+                raise StoreError(400, "Login raced against device deletion")
 
         defer.returnValue(access_token)
 
@@ -501,29 +492,115 @@ class AuthHandler(BaseHandler):
             )
         defer.returnValue(result)
 
-    @defer.inlineCallbacks
-    def _check_password(self, user_id, password):
-        """Authenticate a user against the LDAP and local databases.
+    def get_supported_login_types(self):
+        """Get a the login types supported for the /login API
 
-        user_id is checked case insensitively against the local database, but
-        will throw if there are multiple inexact matches.
+        By default this is just 'm.login.password' (unless password_enabled is
+        False in the config file), but password auth providers can provide
+        other login types.
+
+        Returns:
+            Iterable[str]: login types
+        """
+        return self._supported_login_types
+
+    @defer.inlineCallbacks
+    def validate_login(self, username, login_submission):
+        """Authenticates the user for the /login API
+
+        Also used by the user-interactive auth flow to validate
+        m.login.password auth types.
 
         Args:
-            user_id (str): complete @user:id
+            username (str): username supplied by the user
+            login_submission (dict): the whole of the login submission
+                (including 'type' and other relevant fields)
         Returns:
-            (str) the canonical_user_id
+            Deferred[str, func]: canonical user id, and optional callback
+                to be called once the access token and device id are issued
         Raises:
-            LoginError if login fails
+            StoreError if there was a problem accessing the database
+            SynapseError if there was a problem with the request
+            LoginError if there was an authentication problem.
         """
+
+        if username.startswith('@'):
+            qualified_user_id = username
+        else:
+            qualified_user_id = UserID(
+                username, self.hs.hostname
+            ).to_string()
+
+        login_type = login_submission.get("type")
+        known_login_type = False
+
+        # special case to check for "password" for the check_password interface
+        # for the auth providers
+        password = login_submission.get("password")
+        if login_type == LoginType.PASSWORD:
+            if not self._password_enabled:
+                raise SynapseError(400, "Password login has been disabled.")
+            if not password:
+                raise SynapseError(400, "Missing parameter: password")
+
         for provider in self.password_providers:
-            is_valid = yield provider.check_password(user_id, password)
-            if is_valid:
-                defer.returnValue(user_id)
+            if (hasattr(provider, "check_password")
+                    and login_type == LoginType.PASSWORD):
+                known_login_type = True
+                is_valid = yield provider.check_password(
+                    qualified_user_id, password,
+                )
+                if is_valid:
+                    defer.returnValue(qualified_user_id)
 
-        canonical_user_id = yield self._check_local_password(user_id, password)
+            if (not hasattr(provider, "get_supported_login_types")
+                    or not hasattr(provider, "check_auth")):
+                # this password provider doesn't understand custom login types
+                continue
 
-        if canonical_user_id:
-            defer.returnValue(canonical_user_id)
+            supported_login_types = provider.get_supported_login_types()
+            if login_type not in supported_login_types:
+                # this password provider doesn't understand this login type
+                continue
+
+            known_login_type = True
+            login_fields = supported_login_types[login_type]
+
+            missing_fields = []
+            login_dict = {}
+            for f in login_fields:
+                if f not in login_submission:
+                    missing_fields.append(f)
+                else:
+                    login_dict[f] = login_submission[f]
+            if missing_fields:
+                raise SynapseError(
+                    400, "Missing parameters for login type %s: %s" % (
+                        login_type,
+                        missing_fields,
+                    ),
+                )
+
+            result = yield provider.check_auth(
+                username, login_type, login_dict,
+            )
+            if result:
+                if isinstance(result, str):
+                    result = (result, None)
+                defer.returnValue(result)
+
+        if login_type == LoginType.PASSWORD:
+            known_login_type = True
+
+            canonical_user_id = yield self._check_local_password(
+                qualified_user_id, password,
+            )
+
+            if canonical_user_id:
+                defer.returnValue((canonical_user_id, None))
+
+        if not known_login_type:
+            raise SynapseError(400, "Unknown login type %s" % login_type)
 
         # unknown username or invalid password. We raise a 403 here, but note
         # that if we're doing user-interactive login, it turns all LoginErrors
@@ -584,13 +661,80 @@ class AuthHandler(BaseHandler):
             if e.code == 404:
                 raise SynapseError(404, "Unknown user", Codes.NOT_FOUND)
             raise e
-        yield self.store.user_delete_access_tokens(
-            user_id, except_access_token_id
+        yield self.delete_access_tokens_for_user(
+            user_id, except_token_id=except_access_token_id,
         )
         yield self.hs.get_pusherpool().remove_pushers_by_user(
             user_id, except_access_token_id
         )
 
+    @defer.inlineCallbacks
+    def deactivate_account(self, user_id):
+        """Deactivate a user's account
+
+        Args:
+            user_id (str): ID of user to be deactivated
+
+        Returns:
+            Deferred
+        """
+        # FIXME: Theoretically there is a race here wherein user resets
+        # password using threepid.
+        yield self.delete_access_tokens_for_user(user_id)
+        yield self.store.user_delete_threepids(user_id)
+        yield self.store.user_set_password_hash(user_id, None)
+
+    @defer.inlineCallbacks
+    def delete_access_token(self, access_token):
+        """Invalidate a single access token
+
+        Args:
+            access_token (str): access token to be deleted
+
+        Returns:
+            Deferred
+        """
+        user_info = yield self.auth.get_user_by_access_token(access_token)
+        yield self.store.delete_access_token(access_token)
+
+        # see if any of our auth providers want to know about this
+        for provider in self.password_providers:
+            if hasattr(provider, "on_logged_out"):
+                yield provider.on_logged_out(
+                    user_id=str(user_info["user"]),
+                    device_id=user_info["device_id"],
+                    access_token=access_token,
+                )
+
+    @defer.inlineCallbacks
+    def delete_access_tokens_for_user(self, user_id, except_token_id=None,
+                                      device_id=None):
+        """Invalidate access tokens belonging to a user
+
+        Args:
+            user_id (str):  ID of user the tokens belong to
+            except_token_id (str|None): access_token ID which should *not* be
+                deleted
+            device_id (str|None):  ID of device the tokens are associated with.
+                If None, tokens associated with any device (or no device) will
+                be deleted
+        Returns:
+            Deferred
+        """
+        tokens_and_devices = yield self.store.user_delete_access_tokens(
+            user_id, except_token_id=except_token_id, device_id=device_id,
+        )
+
+        # see if any of our auth providers want to know about this
+        for provider in self.password_providers:
+            if hasattr(provider, "on_logged_out"):
+                for token, device_id in tokens_and_devices:
+                    yield provider.on_logged_out(
+                        user_id=user_id,
+                        device_id=device_id,
+                        access_token=token,
+                    )
+
     @defer.inlineCallbacks
     def add_threepid(self, user_id, medium, address, validated_at):
         # 'Canonicalise' email addresses down to lower case.
@@ -696,30 +840,3 @@ class MacaroonGeneartor(object):
         macaroon.add_first_party_caveat("gen = 1")
         macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
         return macaroon
-
-
-class _AccountHandler(object):
-    """A proxy object that gets passed to password auth providers so they
-    can register new users etc if necessary.
-    """
-    def __init__(self, hs, check_user_exists):
-        self.hs = hs
-
-        self._check_user_exists = check_user_exists
-
-    def check_user_exists(self, user_id):
-        """Check if user exissts.
-
-        Returns:
-            Deferred(bool)
-        """
-        return self._check_user_exists(user_id)
-
-    def register(self, localpart):
-        """Registers a new user with given localpart
-
-        Returns:
-            Deferred: a 2-tuple of (user_id, access_token)
-        """
-        reg = self.hs.get_handlers().registration_handler
-        return reg.register(localpart=localpart)
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index dac4b3f4e..579d8477b 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -34,6 +34,7 @@ class DeviceHandler(BaseHandler):
 
         self.hs = hs
         self.state = hs.get_state_handler()
+        self._auth_handler = hs.get_auth_handler()
         self.federation_sender = hs.get_federation_sender()
         self.federation = hs.get_replication_layer()
 
@@ -159,9 +160,8 @@ class DeviceHandler(BaseHandler):
             else:
                 raise
 
-        yield self.store.user_delete_access_tokens(
+        yield self._auth_handler.delete_access_tokens_for_user(
             user_id, device_id=device_id,
-            delete_refresh_tokens=True,
         )
 
         yield self.store.delete_e2e_keys_by_device(
@@ -194,9 +194,8 @@ class DeviceHandler(BaseHandler):
         # Delete access tokens and e2e keys for each device. Not optimised as it is not
         # considered as part of a critical path.
         for device_id in device_ids:
-            yield self.store.user_delete_access_tokens(
+            yield self._auth_handler.delete_access_tokens_for_user(
                 user_id, device_id=device_id,
-                delete_refresh_tokens=True,
             )
             yield self.store.delete_e2e_keys_by_device(
                 user_id=user_id, device_id=device_id
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 8b1e60675..ac7073088 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -1706,6 +1706,17 @@ class FederationHandler(BaseHandler):
     @defer.inlineCallbacks
     @log_function
     def do_auth(self, origin, event, context, auth_events):
+        """
+
+        Args:
+            origin (str):
+            event (synapse.events.FrozenEvent):
+            context (synapse.events.snapshot.EventContext):
+            auth_events (dict[(str, str)->str]):
+
+        Returns:
+            defer.Deferred[None]
+        """
         # Check if we have all the auth events.
         current_state = set(e.event_id for e in auth_events.values())
         event_auth_events = set(e_id for e_id, _ in event.auth_events)
@@ -1817,16 +1828,9 @@ class FederationHandler(BaseHandler):
                 current_state = set(e.event_id for e in auth_events.values())
                 different_auth = event_auth_events - current_state
 
-                context.current_state_ids = dict(context.current_state_ids)
-                context.current_state_ids.update({
-                    k: a.event_id for k, a in auth_events.items()
-                    if k != event_key
-                })
-                context.prev_state_ids = dict(context.prev_state_ids)
-                context.prev_state_ids.update({
-                    k: a.event_id for k, a in auth_events.items()
-                })
-                context.state_group = self.store.get_next_state_group()
+                self._update_context_for_auth_events(
+                    context, auth_events, event_key,
+                )
 
         if different_auth and not event.internal_metadata.is_outlier():
             logger.info("Different auth after resolution: %s", different_auth)
@@ -1906,16 +1910,9 @@ class FederationHandler(BaseHandler):
                 # 4. Look at rejects and their proofs.
                 # TODO.
 
-                context.current_state_ids = dict(context.current_state_ids)
-                context.current_state_ids.update({
-                    k: a.event_id for k, a in auth_events.items()
-                    if k != event_key
-                })
-                context.prev_state_ids = dict(context.prev_state_ids)
-                context.prev_state_ids.update({
-                    k: a.event_id for k, a in auth_events.items()
-                })
-                context.state_group = self.store.get_next_state_group()
+                self._update_context_for_auth_events(
+                    context, auth_events, event_key,
+                )
 
         try:
             self.auth.check(event, auth_events=auth_events)
@@ -1923,6 +1920,35 @@ class FederationHandler(BaseHandler):
             logger.warn("Failed auth resolution for %r because %s", event, e)
             raise e
 
+    def _update_context_for_auth_events(self, context, auth_events,
+                                        event_key):
+        """Update the state_ids in an event context after auth event resolution
+
+        Args:
+            context (synapse.events.snapshot.EventContext): event context
+                to be updated
+
+            auth_events (dict[(str, str)->str]): Events to update in the event
+                context.
+
+            event_key ((str, str)): (type, state_key) for the current event.
+                this will not be included in the current_state in the context.
+        """
+        state_updates = {
+            k: a.event_id for k, a in auth_events.iteritems()
+            if k != event_key
+        }
+        context.current_state_ids = dict(context.current_state_ids)
+        context.current_state_ids.update(state_updates)
+        if context.delta_ids is not None:
+            context.delta_ids = dict(context.delta_ids)
+            context.delta_ids.update(state_updates)
+        context.prev_state_ids = dict(context.prev_state_ids)
+        context.prev_state_ids.update({
+            k: a.event_id for k, a in auth_events.iteritems()
+        })
+        context.state_group = self.store.get_next_state_group()
+
     @defer.inlineCallbacks
     def construct_auth_difference(self, local_auth, remote_auth):
         """ Given a local and remote auth chain, find the differences. This
diff --git a/synapse/handlers/groups_local.py b/synapse/handlers/groups_local.py
index 6699d0888..da00aeb0f 100644
--- a/synapse/handlers/groups_local.py
+++ b/synapse/handlers/groups_local.py
@@ -71,6 +71,7 @@ class GroupsLocalHandler(object):
     get_invited_users_in_group = _create_rerouter("get_invited_users_in_group")
 
     add_room_to_group = _create_rerouter("add_room_to_group")
+    update_room_in_group = _create_rerouter("update_room_in_group")
     remove_room_from_group = _create_rerouter("remove_room_from_group")
 
     update_group_summary_room = _create_rerouter("update_group_summary_room")
diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index 62b9bd503..5e5b1952d 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -17,7 +17,6 @@ import logging
 
 from twisted.internet import defer
 
-import synapse.types
 from synapse.api.errors import SynapseError, AuthError, CodeMessageException
 from synapse.types import UserID, get_domain_from_id
 from ._base import BaseHandler
@@ -140,7 +139,7 @@ class ProfileHandler(BaseHandler):
             target_user.localpart, new_displayname
         )
 
-        yield self._update_join_states(requester)
+        yield self._update_join_states(requester, target_user)
 
     @defer.inlineCallbacks
     def get_avatar_url(self, target_user):
@@ -184,7 +183,7 @@ class ProfileHandler(BaseHandler):
             target_user.localpart, new_avatar_url
         )
 
-        yield self._update_join_states(requester)
+        yield self._update_join_states(requester, target_user)
 
     @defer.inlineCallbacks
     def on_profile_query(self, args):
@@ -209,28 +208,24 @@ class ProfileHandler(BaseHandler):
         defer.returnValue(response)
 
     @defer.inlineCallbacks
-    def _update_join_states(self, requester):
-        user = requester.user
-        if not self.hs.is_mine(user):
+    def _update_join_states(self, requester, target_user):
+        if not self.hs.is_mine(target_user):
             return
 
         yield self.ratelimit(requester)
 
         room_ids = yield self.store.get_rooms_for_user(
-            user.to_string(),
+            target_user.to_string(),
         )
 
         for room_id in room_ids:
             handler = self.hs.get_handlers().room_member_handler
             try:
-                # Assume the user isn't a guest because we don't let guests set
-                # profile or avatar data.
-                # XXX why are we recreating `requester` here for each room?
-                # what was wrong with the `requester` we were passed?
-                requester = synapse.types.create_requester(user)
+                # Assume the target_user isn't a guest,
+                # because we don't let guests set profile or avatar data.
                 yield handler.update_membership(
                     requester,
-                    user,
+                    target_user,
                     room_id,
                     "join",  # We treat a profile update like a join.
                     ratelimit=False,  # Try to hide that these events aren't atomic.
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 49dc33c14..f6e7e5856 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -36,6 +36,7 @@ class RegistrationHandler(BaseHandler):
         super(RegistrationHandler, self).__init__(hs)
 
         self.auth = hs.get_auth()
+        self._auth_handler = hs.get_auth_handler()
         self.profile_handler = hs.get_profile_handler()
         self.captcha_client = CaptchaServerHttpClient(hs)
 
@@ -416,7 +417,7 @@ class RegistrationHandler(BaseHandler):
                 create_profile_with_localpart=user.localpart,
             )
         else:
-            yield self.store.user_delete_access_tokens(user_id=user_id)
+            yield self._auth_handler.delete_access_tokens_for_user(user_id)
             yield self.store.add_access_token_to_user(user_id=user_id, token=token)
 
         if displayname is not None:
diff --git a/synapse/handlers/room_list.py b/synapse/handlers/room_list.py
index 41e1781df..2cf34e51c 100644
--- a/synapse/handlers/room_list.py
+++ b/synapse/handlers/room_list.py
@@ -20,6 +20,7 @@ from ._base import BaseHandler
 from synapse.api.constants import (
     EventTypes, JoinRules,
 )
+from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
 from synapse.util.async import concurrently_execute
 from synapse.util.caches.descriptors import cachedInlineCallbacks
 from synapse.util.caches.response_cache import ResponseCache
@@ -70,6 +71,7 @@ class RoomListHandler(BaseHandler):
         if search_filter:
             # We explicitly don't bother caching searches or requests for
             # appservice specific lists.
+            logger.info("Bypassing cache as search request.")
             return self._get_public_room_list(
                 limit, since_token, search_filter, network_tuple=network_tuple,
             )
@@ -77,13 +79,16 @@ class RoomListHandler(BaseHandler):
         key = (limit, since_token, network_tuple)
         result = self.response_cache.get(key)
         if not result:
+            logger.info("No cached result, calculating one.")
             result = self.response_cache.set(
                 key,
-                self._get_public_room_list(
+                preserve_fn(self._get_public_room_list)(
                     limit, since_token, network_tuple=network_tuple
                 )
             )
-        return result
+        else:
+            logger.info("Using cached deferred result.")
+        return make_deferred_yieldable(result)
 
     @defer.inlineCallbacks
     def _get_public_room_list(self, limit=None, since_token=None,
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 219529936..b12988f3c 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -15,7 +15,7 @@
 
 from synapse.api.constants import Membership, EventTypes
 from synapse.util.async import concurrently_execute
-from synapse.util.logcontext import LoggingContext
+from synapse.util.logcontext import LoggingContext, make_deferred_yieldable, preserve_fn
 from synapse.util.metrics import Measure, measure_func
 from synapse.util.caches.response_cache import ResponseCache
 from synapse.push.clientformat import format_push_rules_for_user
@@ -184,11 +184,11 @@ class SyncHandler(object):
         if not result:
             result = self.response_cache.set(
                 sync_config.request_key,
-                self._wait_for_sync_for_user(
+                preserve_fn(self._wait_for_sync_for_user)(
                     sync_config, since_token, timeout, full_state
                 )
             )
-        return result
+        return make_deferred_yieldable(result)
 
     @defer.inlineCallbacks
     def _wait_for_sync_for_user(self, sync_config, since_token, timeout,
diff --git a/synapse/handlers/user_directory.py b/synapse/handlers/user_directory.py
index 2a49456bf..b5be5d962 100644
--- a/synapse/handlers/user_directory.py
+++ b/synapse/handlers/user_directory.py
@@ -152,7 +152,7 @@ class UserDirectoyHandler(object):
 
         for room_id in room_ids:
             logger.info("Handling room %d/%d", num_processed_rooms, len(room_ids))
-            yield self._handle_intial_room(room_id)
+            yield self._handle_initial_room(room_id)
             num_processed_rooms += 1
             yield sleep(self.INITIAL_SLEEP_MS / 1000.)
 
@@ -166,7 +166,7 @@ class UserDirectoyHandler(object):
         yield self.store.update_user_directory_stream_pos(new_pos)
 
     @defer.inlineCallbacks
-    def _handle_intial_room(self, room_id):
+    def _handle_initial_room(self, room_id):
         """Called when we initially fill out user_directory one room at a time
         """
         is_in_room = yield self.store.is_host_joined(room_id, self.server_name)
diff --git a/synapse/http/additional_resource.py b/synapse/http/additional_resource.py
new file mode 100644
index 000000000..343e932cb
--- /dev/null
+++ b/synapse/http/additional_resource.py
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from synapse.http.server import wrap_request_handler
+from twisted.web.resource import Resource
+from twisted.web.server import NOT_DONE_YET
+
+
+class AdditionalResource(Resource):
+    """Resource wrapper for additional_resources
+
+    If the user has configured additional_resources, we need to wrap the
+    handler class with a Resource so that we can map it into the resource tree.
+
+    This class is also where we wrap the request handler with logging, metrics,
+    and exception handling.
+    """
+    def __init__(self, hs, handler):
+        """Initialise AdditionalResource
+
+        The ``handler`` should return a deferred which completes when it has
+        done handling the request. It should write a response with
+        ``request.write()``, and call ``request.finish()``.
+
+        Args:
+            hs (synapse.server.HomeServer): homeserver
+            handler ((twisted.web.server.Request) -> twisted.internet.defer.Deferred):
+                function to be called to handle the request.
+        """
+        Resource.__init__(self)
+        self._handler = handler
+
+        # these are required by the request_handler wrapper
+        self.version_string = hs.version_string
+        self.clock = hs.get_clock()
+
+    def render(self, request):
+        self._async_render(request)
+        return NOT_DONE_YET
+
+    @wrap_request_handler
+    def _async_render(self, request):
+        return self._handler(request)
diff --git a/synapse/http/client.py b/synapse/http/client.py
index 9eba046bb..4abb479ae 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -18,7 +18,7 @@ from OpenSSL.SSL import VERIFY_NONE
 from synapse.api.errors import (
     CodeMessageException, MatrixCodeMessageException, SynapseError, Codes,
 )
-from synapse.util.logcontext import preserve_context_over_fn
+from synapse.util.logcontext import make_deferred_yieldable
 from synapse.util import logcontext
 import synapse.metrics
 from synapse.http.endpoint import SpiderEndpoint
@@ -114,43 +114,73 @@ class SimpleHttpClient(object):
             raise e
 
     @defer.inlineCallbacks
-    def post_urlencoded_get_json(self, uri, args={}):
+    def post_urlencoded_get_json(self, uri, args={}, headers=None):
+        """
+        Args:
+            uri (str):
+            args (dict[str, str|List[str]]): query params
+            headers (dict[str, List[str]]|None): If not None, a map from
+               header name to a list of values for that header
+
+        Returns:
+            Deferred[object]: parsed json
+        """
+
         # TODO: Do we ever want to log message contents?
         logger.debug("post_urlencoded_get_json args: %s", args)
 
         query_bytes = urllib.urlencode(encode_urlencode_args(args), True)
 
+        actual_headers = {
+            b"Content-Type": [b"application/x-www-form-urlencoded"],
+            b"User-Agent": [self.user_agent],
+        }
+        if headers:
+            actual_headers.update(headers)
+
         response = yield self.request(
             "POST",
             uri.encode("ascii"),
-            headers=Headers({
-                b"Content-Type": [b"application/x-www-form-urlencoded"],
-                b"User-Agent": [self.user_agent],
-            }),
+            headers=Headers(actual_headers),
             bodyProducer=FileBodyProducer(StringIO(query_bytes))
         )
 
-        body = yield preserve_context_over_fn(readBody, response)
+        body = yield make_deferred_yieldable(readBody(response))
 
         defer.returnValue(json.loads(body))
 
     @defer.inlineCallbacks
-    def post_json_get_json(self, uri, post_json):
+    def post_json_get_json(self, uri, post_json, headers=None):
+        """
+
+        Args:
+            uri (str):
+            post_json (object):
+            headers (dict[str, List[str]]|None): If not None, a map from
+               header name to a list of values for that header
+
+        Returns:
+            Deferred[object]: parsed json
+        """
         json_str = encode_canonical_json(post_json)
 
         logger.debug("HTTP POST %s -> %s", json_str, uri)
 
+        actual_headers = {
+            b"Content-Type": [b"application/json"],
+            b"User-Agent": [self.user_agent],
+        }
+        if headers:
+            actual_headers.update(headers)
+
         response = yield self.request(
             "POST",
             uri.encode("ascii"),
-            headers=Headers({
-                b"Content-Type": [b"application/json"],
-                b"User-Agent": [self.user_agent],
-            }),
+            headers=Headers(actual_headers),
             bodyProducer=FileBodyProducer(StringIO(json_str))
         )
 
-        body = yield preserve_context_over_fn(readBody, response)
+        body = yield make_deferred_yieldable(readBody(response))
 
         if 200 <= response.code < 300:
             defer.returnValue(json.loads(body))
@@ -160,7 +190,7 @@ class SimpleHttpClient(object):
         defer.returnValue(json.loads(body))
 
     @defer.inlineCallbacks
-    def get_json(self, uri, args={}):
+    def get_json(self, uri, args={}, headers=None):
         """ Gets some json from the given URI.
 
         Args:
@@ -169,6 +199,8 @@ class SimpleHttpClient(object):
                 None.
                 **Note**: The value of each key is assumed to be an iterable
                 and *not* a string.
+            headers (dict[str, List[str]]|None): If not None, a map from
+               header name to a list of values for that header
         Returns:
             Deferred: Succeeds when we get *any* 2xx HTTP response, with the
             HTTP body as JSON.
@@ -177,13 +209,13 @@ class SimpleHttpClient(object):
             error message.
         """
         try:
-            body = yield self.get_raw(uri, args)
+            body = yield self.get_raw(uri, args, headers=headers)
             defer.returnValue(json.loads(body))
         except CodeMessageException as e:
             raise self._exceptionFromFailedRequest(e.code, e.msg)
 
     @defer.inlineCallbacks
-    def put_json(self, uri, json_body, args={}):
+    def put_json(self, uri, json_body, args={}, headers=None):
         """ Puts some json to the given URI.
 
         Args:
@@ -193,6 +225,8 @@ class SimpleHttpClient(object):
                 None.
                 **Note**: The value of each key is assumed to be an iterable
                 and *not* a string.
+            headers (dict[str, List[str]]|None): If not None, a map from
+               header name to a list of values for that header
         Returns:
             Deferred: Succeeds when we get *any* 2xx HTTP response, with the
             HTTP body as JSON.
@@ -205,17 +239,21 @@ class SimpleHttpClient(object):
 
         json_str = encode_canonical_json(json_body)
 
+        actual_headers = {
+            b"Content-Type": [b"application/json"],
+            b"User-Agent": [self.user_agent],
+        }
+        if headers:
+            actual_headers.update(headers)
+
         response = yield self.request(
             "PUT",
             uri.encode("ascii"),
-            headers=Headers({
-                b"User-Agent": [self.user_agent],
-                "Content-Type": ["application/json"]
-            }),
+            headers=Headers(actual_headers),
             bodyProducer=FileBodyProducer(StringIO(json_str))
         )
 
-        body = yield preserve_context_over_fn(readBody, response)
+        body = yield make_deferred_yieldable(readBody(response))
 
         if 200 <= response.code < 300:
             defer.returnValue(json.loads(body))
@@ -226,7 +264,7 @@ class SimpleHttpClient(object):
             raise CodeMessageException(response.code, body)
 
     @defer.inlineCallbacks
-    def get_raw(self, uri, args={}):
+    def get_raw(self, uri, args={}, headers=None):
         """ Gets raw text from the given URI.
 
         Args:
@@ -235,6 +273,8 @@ class SimpleHttpClient(object):
                 None.
                 **Note**: The value of each key is assumed to be an iterable
                 and *not* a string.
+            headers (dict[str, List[str]]|None): If not None, a map from
+               header name to a list of values for that header
         Returns:
             Deferred: Succeeds when we get *any* 2xx HTTP response, with the
             HTTP body at text.
@@ -246,15 +286,19 @@ class SimpleHttpClient(object):
             query_bytes = urllib.urlencode(args, True)
             uri = "%s?%s" % (uri, query_bytes)
 
+        actual_headers = {
+            b"User-Agent": [self.user_agent],
+        }
+        if headers:
+            actual_headers.update(headers)
+
         response = yield self.request(
             "GET",
             uri.encode("ascii"),
-            headers=Headers({
-                b"User-Agent": [self.user_agent],
-            })
+            headers=Headers(actual_headers),
         )
 
-        body = yield preserve_context_over_fn(readBody, response)
+        body = yield make_deferred_yieldable(readBody(response))
 
         if 200 <= response.code < 300:
             defer.returnValue(body)
@@ -274,27 +318,33 @@ class SimpleHttpClient(object):
     # The two should be factored out.
 
     @defer.inlineCallbacks
-    def get_file(self, url, output_stream, max_size=None):
+    def get_file(self, url, output_stream, max_size=None, headers=None):
         """GETs a file from a given URL
         Args:
             url (str): The URL to GET
             output_stream (file): File to write the response body to.
+            headers (dict[str, List[str]]|None): If not None, a map from
+               header name to a list of values for that header
         Returns:
             A (int,dict,string,int) tuple of the file length, dict of the response
             headers, absolute URI of the response and HTTP response code.
         """
 
+        actual_headers = {
+            b"User-Agent": [self.user_agent],
+        }
+        if headers:
+            actual_headers.update(headers)
+
         response = yield self.request(
             "GET",
             url.encode("ascii"),
-            headers=Headers({
-                b"User-Agent": [self.user_agent],
-            })
+            headers=Headers(actual_headers),
         )
 
-        headers = dict(response.headers.getAllRawHeaders())
+        resp_headers = dict(response.headers.getAllRawHeaders())
 
-        if 'Content-Length' in headers and headers['Content-Length'] > max_size:
+        if 'Content-Length' in resp_headers and resp_headers['Content-Length'] > max_size:
             logger.warn("Requested URL is too large > %r bytes" % (self.max_size,))
             raise SynapseError(
                 502,
@@ -315,10 +365,9 @@ class SimpleHttpClient(object):
         # straight back in again
 
         try:
-            length = yield preserve_context_over_fn(
-                _readBodyToFile,
-                response, output_stream, max_size
-            )
+            length = yield make_deferred_yieldable(_readBodyToFile(
+                response, output_stream, max_size,
+            ))
         except Exception as e:
             logger.exception("Failed to download body")
             raise SynapseError(
@@ -327,7 +376,9 @@ class SimpleHttpClient(object):
                 Codes.UNKNOWN,
             )
 
-        defer.returnValue((length, headers, response.request.absoluteURI, response.code))
+        defer.returnValue(
+            (length, resp_headers, response.request.absoluteURI, response.code),
+        )
 
 
 # XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
@@ -395,7 +446,7 @@ class CaptchaServerHttpClient(SimpleHttpClient):
         )
 
         try:
-            body = yield preserve_context_over_fn(readBody, response)
+            body = yield make_deferred_yieldable(readBody(response))
             defer.returnValue(body)
         except PartialDownloadError as e:
             # twisted dislikes google's response, no content length.
diff --git a/synapse/http/servlet.py b/synapse/http/servlet.py
index 8118ee7cc..71420e54d 100644
--- a/synapse/http/servlet.py
+++ b/synapse/http/servlet.py
@@ -167,7 +167,8 @@ def parse_json_value_from_request(request):
 
     try:
         content = simplejson.loads(content_bytes)
-    except simplejson.JSONDecodeError:
+    except Exception as e:
+        logger.warn("Unable to parse JSON: %s", e)
         raise SynapseError(400, "Content not JSON.", errcode=Codes.NOT_JSON)
 
     return content
diff --git a/synapse/module_api/__init__.py b/synapse/module_api/__init__.py
new file mode 100644
index 000000000..dc680ddf4
--- /dev/null
+++ b/synapse/module_api/__init__.py
@@ -0,0 +1,113 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from synapse.types import UserID
+
+
+class ModuleApi(object):
+    """A proxy object that gets passed to password auth providers so they
+    can register new users etc if necessary.
+    """
+    def __init__(self, hs, auth_handler):
+        self.hs = hs
+
+        self._store = hs.get_datastore()
+        self._auth = hs.get_auth()
+        self._auth_handler = auth_handler
+
+    def get_user_by_req(self, req, allow_guest=False):
+        """Check the access_token provided for a request
+
+        Args:
+            req (twisted.web.server.Request): Incoming HTTP request
+            allow_guest (bool): True if guest users should be allowed. If this
+                is False, and the access token is for a guest user, an
+                AuthError will be thrown
+        Returns:
+            twisted.internet.defer.Deferred[synapse.types.Requester]:
+                the requester for this request
+        Raises:
+            synapse.api.errors.AuthError: if no user by that token exists,
+                or the token is invalid.
+        """
+        return self._auth.get_user_by_req(req, allow_guest)
+
+    def get_qualified_user_id(self, username):
+        """Qualify a user id, if necessary
+
+        Takes a user id provided by the user and adds the @ and :domain to
+        qualify it, if necessary
+
+        Args:
+            username (str): provided user id
+
+        Returns:
+            str: qualified @user:id
+        """
+        if username.startswith('@'):
+            return username
+        return UserID(username, self.hs.hostname).to_string()
+
+    def check_user_exists(self, user_id):
+        """Check if user exists.
+
+        Args:
+            user_id (str): Complete @user:id
+
+        Returns:
+            Deferred[str|None]: Canonical (case-corrected) user_id, or None
+               if the user is not registered.
+        """
+        return self._auth_handler.check_user_exists(user_id)
+
+    def register(self, localpart):
+        """Registers a new user with given localpart
+
+        Returns:
+            Deferred: a 2-tuple of (user_id, access_token)
+        """
+        reg = self.hs.get_handlers().registration_handler
+        return reg.register(localpart=localpart)
+
+    def invalidate_access_token(self, access_token):
+        """Invalidate an access token for a user
+
+        Args:
+            access_token(str): access token
+
+        Returns:
+            twisted.internet.defer.Deferred - resolves once the access token
+               has been removed.
+
+        Raises:
+            synapse.api.errors.AuthError: the access token is invalid
+        """
+
+        return self._auth_handler.delete_access_token(access_token)
+
+    def run_db_interaction(self, desc, func, *args, **kwargs):
+        """Run a function with a database connection
+
+        Args:
+            desc (str): description for the transaction, for metrics etc
+            func (func): function to be run. Passed a database cursor object
+                as well as *args and **kwargs
+            *args: positional args to be passed to func
+            **kwargs: named args to be passed to func
+
+        Returns:
+            Deferred[object]: result of func
+        """
+        return self._store.runInteraction(desc, func, *args, **kwargs)
diff --git a/synapse/replication/slave/storage/_base.py b/synapse/replication/slave/storage/_base.py
index b96264116..61f5590c5 100644
--- a/synapse/replication/slave/storage/_base.py
+++ b/synapse/replication/slave/storage/_base.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 
 class BaseSlavedStore(SQLBaseStore):
     def __init__(self, db_conn, hs):
-        super(BaseSlavedStore, self).__init__(hs)
+        super(BaseSlavedStore, self).__init__(db_conn, hs)
         if isinstance(self.database_engine, PostgresEngine):
             self._cache_id_gen = SlavedIdTracker(
                 db_conn, "cache_invalidation_stream", "stream_id",
diff --git a/synapse/rest/client/v1/admin.py b/synapse/rest/client/v1/admin.py
index 465b25033..1197158fd 100644
--- a/synapse/rest/client/v1/admin.py
+++ b/synapse/rest/client/v1/admin.py
@@ -137,7 +137,7 @@ class DeactivateAccountRestServlet(ClientV1RestServlet):
     PATTERNS = client_path_patterns("/admin/deactivate/(?P<target_user_id>[^/]*)")
 
     def __init__(self, hs):
-        self.store = hs.get_datastore()
+        self._auth_handler = hs.get_auth_handler()
         super(DeactivateAccountRestServlet, self).__init__(hs)
 
     @defer.inlineCallbacks
@@ -149,12 +149,7 @@ class DeactivateAccountRestServlet(ClientV1RestServlet):
         if not is_admin:
             raise AuthError(403, "You are not a server admin")
 
-        # FIXME: Theoretically there is a race here wherein user resets password
-        # using threepid.
-        yield self.store.user_delete_access_tokens(target_user_id)
-        yield self.store.user_delete_threepids(target_user_id)
-        yield self.store.user_set_password_hash(target_user_id, None)
-
+        yield self._auth_handler.deactivate_account(target_user_id)
         defer.returnValue((200, {}))
 
 
diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py
index 9536e8ade..5669ecb72 100644
--- a/synapse/rest/client/v1/login.py
+++ b/synapse/rest/client/v1/login.py
@@ -85,7 +85,6 @@ def login_id_thirdparty_from_phone(identifier):
 
 class LoginRestServlet(ClientV1RestServlet):
     PATTERNS = client_path_patterns("/login$")
-    PASS_TYPE = "m.login.password"
     SAML2_TYPE = "m.login.saml2"
     CAS_TYPE = "m.login.cas"
     TOKEN_TYPE = "m.login.token"
@@ -94,7 +93,6 @@ class LoginRestServlet(ClientV1RestServlet):
     def __init__(self, hs):
         super(LoginRestServlet, self).__init__(hs)
         self.idp_redirect_url = hs.config.saml2_idp_redirect_url
-        self.password_enabled = hs.config.password_enabled
         self.saml2_enabled = hs.config.saml2_enabled
         self.jwt_enabled = hs.config.jwt_enabled
         self.jwt_secret = hs.config.jwt_secret
@@ -121,8 +119,10 @@ class LoginRestServlet(ClientV1RestServlet):
             # fall back to the fallback API if they don't understand one of the
             # login flow types returned.
             flows.append({"type": LoginRestServlet.TOKEN_TYPE})
-        if self.password_enabled:
-            flows.append({"type": LoginRestServlet.PASS_TYPE})
+
+        flows.extend((
+            {"type": t} for t in self.auth_handler.get_supported_login_types()
+        ))
 
         return (200, {"flows": flows})
 
@@ -133,14 +133,8 @@ class LoginRestServlet(ClientV1RestServlet):
     def on_POST(self, request):
         login_submission = parse_json_object_from_request(request)
         try:
-            if login_submission["type"] == LoginRestServlet.PASS_TYPE:
-                if not self.password_enabled:
-                    raise SynapseError(400, "Password login has been disabled.")
-
-                result = yield self.do_password_login(login_submission)
-                defer.returnValue(result)
-            elif self.saml2_enabled and (login_submission["type"] ==
-                                         LoginRestServlet.SAML2_TYPE):
+            if self.saml2_enabled and (login_submission["type"] ==
+                                       LoginRestServlet.SAML2_TYPE):
                 relay_state = ""
                 if "relay_state" in login_submission:
                     relay_state = "&RelayState=" + urllib.quote(
@@ -157,15 +151,31 @@ class LoginRestServlet(ClientV1RestServlet):
                 result = yield self.do_token_login(login_submission)
                 defer.returnValue(result)
             else:
-                raise SynapseError(400, "Bad login type.")
+                result = yield self._do_other_login(login_submission)
+                defer.returnValue(result)
         except KeyError:
             raise SynapseError(400, "Missing JSON keys.")
 
     @defer.inlineCallbacks
-    def do_password_login(self, login_submission):
-        if "password" not in login_submission:
-            raise SynapseError(400, "Missing parameter: password")
+    def _do_other_login(self, login_submission):
+        """Handle non-token/saml/jwt logins
 
+        Args:
+            login_submission:
+
+        Returns:
+            (int, object): HTTP code/response
+        """
+        # Log the request we got, but only certain fields to minimise the chance of
+        # logging someone's password (even if they accidentally put it in the wrong
+        # field)
+        logger.info(
+            "Got login request with identifier: %r, medium: %r, address: %r, user: %r",
+            login_submission.get('identifier'),
+            login_submission.get('medium'),
+            login_submission.get('address'),
+            login_submission.get('user'),
+        )
         login_submission_legacy_convert(login_submission)
 
         if "identifier" not in login_submission:
@@ -208,30 +218,29 @@ class LoginRestServlet(ClientV1RestServlet):
         if "user" not in identifier:
             raise SynapseError(400, "User identifier is missing 'user' key")
 
-        user_id = identifier["user"]
-
-        if not user_id.startswith('@'):
-            user_id = UserID(
-                user_id, self.hs.hostname
-            ).to_string()
-
         auth_handler = self.auth_handler
-        user_id = yield auth_handler.validate_password_login(
-            user_id=user_id,
-            password=login_submission["password"],
+        canonical_user_id, callback = yield auth_handler.validate_login(
+            identifier["user"],
+            login_submission,
+        )
+
+        device_id = yield self._register_device(
+            canonical_user_id, login_submission,
         )
-        device_id = yield self._register_device(user_id, login_submission)
         access_token = yield auth_handler.get_access_token_for_user_id(
-            user_id, device_id,
-            login_submission.get("initial_device_display_name"),
+            canonical_user_id, device_id,
         )
+
         result = {
-            "user_id": user_id,  # may have changed
+            "user_id": canonical_user_id,
             "access_token": access_token,
             "home_server": self.hs.hostname,
             "device_id": device_id,
         }
 
+        if callback is not None:
+            yield callback(result)
+
         defer.returnValue((200, result))
 
     @defer.inlineCallbacks
@@ -244,7 +253,6 @@ class LoginRestServlet(ClientV1RestServlet):
         device_id = yield self._register_device(user_id, login_submission)
         access_token = yield auth_handler.get_access_token_for_user_id(
             user_id, device_id,
-            login_submission.get("initial_device_display_name"),
         )
         result = {
             "user_id": user_id,  # may have changed
@@ -287,7 +295,6 @@ class LoginRestServlet(ClientV1RestServlet):
             )
             access_token = yield auth_handler.get_access_token_for_user_id(
                 registered_user_id, device_id,
-                login_submission.get("initial_device_display_name"),
             )
 
             result = {
diff --git a/synapse/rest/client/v1/logout.py b/synapse/rest/client/v1/logout.py
index 1358d0aca..6add75478 100644
--- a/synapse/rest/client/v1/logout.py
+++ b/synapse/rest/client/v1/logout.py
@@ -30,7 +30,7 @@ class LogoutRestServlet(ClientV1RestServlet):
 
     def __init__(self, hs):
         super(LogoutRestServlet, self).__init__(hs)
-        self.store = hs.get_datastore()
+        self._auth_handler = hs.get_auth_handler()
 
     def on_OPTIONS(self, request):
         return (200, {})
@@ -38,7 +38,7 @@ class LogoutRestServlet(ClientV1RestServlet):
     @defer.inlineCallbacks
     def on_POST(self, request):
         access_token = get_access_token_from_request(request)
-        yield self.store.delete_access_token(access_token)
+        yield self._auth_handler.delete_access_token(access_token)
         defer.returnValue((200, {}))
 
 
@@ -47,8 +47,8 @@ class LogoutAllRestServlet(ClientV1RestServlet):
 
     def __init__(self, hs):
         super(LogoutAllRestServlet, self).__init__(hs)
-        self.store = hs.get_datastore()
         self.auth = hs.get_auth()
+        self._auth_handler = hs.get_auth_handler()
 
     def on_OPTIONS(self, request):
         return (200, {})
@@ -57,7 +57,7 @@ class LogoutAllRestServlet(ClientV1RestServlet):
     def on_POST(self, request):
         requester = yield self.auth.get_user_by_req(request)
         user_id = requester.user.to_string()
-        yield self.store.user_delete_access_tokens(user_id)
+        yield self._auth_handler.delete_access_tokens_for_user(user_id)
         defer.returnValue((200, {}))
 
 
diff --git a/synapse/rest/client/v1/register.py b/synapse/rest/client/v1/register.py
index ecf7e311a..32ed1d3ab 100644
--- a/synapse/rest/client/v1/register.py
+++ b/synapse/rest/client/v1/register.py
@@ -359,7 +359,7 @@ class RegisterRestServlet(ClientV1RestServlet):
         if compare_digest(want_mac, got_mac):
             handler = self.handlers.registration_handler
             user_id, token = yield handler.register(
-                localpart=user,
+                localpart=user.lower(),
                 password=password,
                 admin=bool(admin),
             )
diff --git a/synapse/rest/client/v2_alpha/account.py b/synapse/rest/client/v2_alpha/account.py
index 4990b22b9..726e0a282 100644
--- a/synapse/rest/client/v2_alpha/account.py
+++ b/synapse/rest/client/v2_alpha/account.py
@@ -13,22 +13,21 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import logging
 
 from twisted.internet import defer
 
+from synapse.api.auth import has_access_token
 from synapse.api.constants import LoginType
-from synapse.api.errors import LoginError, SynapseError, Codes
+from synapse.api.errors import Codes, LoginError, SynapseError
 from synapse.http.servlet import (
-    RestServlet, parse_json_object_from_request, assert_params_in_request
+    RestServlet, assert_params_in_request,
+    parse_json_object_from_request,
 )
 from synapse.util.async import run_on_reactor
 from synapse.util.msisdn import phone_number_to_msisdn
-
 from ._base import client_v2_patterns
 
-import logging
-
-
 logger = logging.getLogger(__name__)
 
 
@@ -163,7 +162,6 @@ class DeactivateAccountRestServlet(RestServlet):
 
     def __init__(self, hs):
         self.hs = hs
-        self.store = hs.get_datastore()
         self.auth = hs.get_auth()
         self.auth_handler = hs.get_auth_handler()
         super(DeactivateAccountRestServlet, self).__init__()
@@ -172,6 +170,20 @@ class DeactivateAccountRestServlet(RestServlet):
     def on_POST(self, request):
         body = parse_json_object_from_request(request)
 
+        # if the caller provides an access token, it ought to be valid.
+        requester = None
+        if has_access_token(request):
+            requester = yield self.auth.get_user_by_req(
+                request,
+            )  # type: synapse.types.Requester
+
+        # allow ASes to dectivate their own users
+        if requester and requester.app_service:
+            yield self.auth_handler.deactivate_account(
+                requester.user.to_string()
+            )
+            defer.returnValue((200, {}))
+
         authed, result, params, _ = yield self.auth_handler.check_auth([
             [LoginType.PASSWORD],
         ], body, self.hs.get_ip_from_request(request))
@@ -179,25 +191,22 @@ class DeactivateAccountRestServlet(RestServlet):
         if not authed:
             defer.returnValue((401, result))
 
-        user_id = None
-        requester = None
-
         if LoginType.PASSWORD in result:
+            user_id = result[LoginType.PASSWORD]
             # if using password, they should also be logged in
-            requester = yield self.auth.get_user_by_req(request)
-            user_id = requester.user.to_string()
-            if user_id != result[LoginType.PASSWORD]:
+            if requester is None:
+                raise SynapseError(
+                    400,
+                    "Deactivate account requires an access_token",
+                    errcode=Codes.MISSING_TOKEN
+                )
+            if requester.user.to_string() != user_id:
                 raise LoginError(400, "", Codes.UNKNOWN)
         else:
             logger.error("Auth succeeded but no known type!", result.keys())
             raise SynapseError(500, "", Codes.UNKNOWN)
 
-        # FIXME: Theoretically there is a race here wherein user resets password
-        # using threepid.
-        yield self.store.user_delete_access_tokens(user_id)
-        yield self.store.user_delete_threepids(user_id)
-        yield self.store.user_set_password_hash(user_id, None)
-
+        yield self.auth_handler.deactivate_account(user_id)
         defer.returnValue((200, {}))
 
 
@@ -373,6 +382,20 @@ class ThreepidDeleteRestServlet(RestServlet):
         defer.returnValue((200, {}))
 
 
+class WhoamiRestServlet(RestServlet):
+    PATTERNS = client_v2_patterns("/account/whoami$")
+
+    def __init__(self, hs):
+        super(WhoamiRestServlet, self).__init__()
+        self.auth = hs.get_auth()
+
+    @defer.inlineCallbacks
+    def on_GET(self, request):
+        requester = yield self.auth.get_user_by_req(request)
+
+        defer.returnValue((200, {'user_id': requester.user.to_string()}))
+
+
 def register_servlets(hs, http_server):
     EmailPasswordRequestTokenRestServlet(hs).register(http_server)
     MsisdnPasswordRequestTokenRestServlet(hs).register(http_server)
@@ -382,3 +405,4 @@ def register_servlets(hs, http_server):
     MsisdnThreepidRequestTokenRestServlet(hs).register(http_server)
     ThreepidRestServlet(hs).register(http_server)
     ThreepidDeleteRestServlet(hs).register(http_server)
+    WhoamiRestServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v2_alpha/devices.py b/synapse/rest/client/v2_alpha/devices.py
index b57ba95d2..5321e5abb 100644
--- a/synapse/rest/client/v2_alpha/devices.py
+++ b/synapse/rest/client/v2_alpha/devices.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 
 
 class DevicesRestServlet(servlet.RestServlet):
-    PATTERNS = client_v2_patterns("/devices$", releases=[], v2_alpha=False)
+    PATTERNS = client_v2_patterns("/devices$", v2_alpha=False)
 
     def __init__(self, hs):
         """
@@ -51,7 +51,7 @@ class DeleteDevicesRestServlet(servlet.RestServlet):
     API for bulk deletion of devices. Accepts a JSON object with a devices
     key which lists the device_ids to delete. Requires user interactive auth.
     """
-    PATTERNS = client_v2_patterns("/delete_devices", releases=[], v2_alpha=False)
+    PATTERNS = client_v2_patterns("/delete_devices", v2_alpha=False)
 
     def __init__(self, hs):
         super(DeleteDevicesRestServlet, self).__init__()
@@ -93,8 +93,7 @@ class DeleteDevicesRestServlet(servlet.RestServlet):
 
 
 class DeviceRestServlet(servlet.RestServlet):
-    PATTERNS = client_v2_patterns("/devices/(?P<device_id>[^/]*)$",
-                                  releases=[], v2_alpha=False)
+    PATTERNS = client_v2_patterns("/devices/(?P<device_id>[^/]*)$", v2_alpha=False)
 
     def __init__(self, hs):
         """
@@ -118,6 +117,8 @@ class DeviceRestServlet(servlet.RestServlet):
 
     @defer.inlineCallbacks
     def on_DELETE(self, request, device_id):
+        requester = yield self.auth.get_user_by_req(request)
+
         try:
             body = servlet.parse_json_object_from_request(request)
 
@@ -136,11 +137,12 @@ class DeviceRestServlet(servlet.RestServlet):
         if not authed:
             defer.returnValue((401, result))
 
-        requester = yield self.auth.get_user_by_req(request)
-        yield self.device_handler.delete_device(
-            requester.user.to_string(),
-            device_id,
-        )
+        # check that the UI auth matched the access token
+        user_id = result[constants.LoginType.PASSWORD]
+        if user_id != requester.user.to_string():
+            raise errors.AuthError(403, "Invalid auth")
+
+        yield self.device_handler.delete_device(user_id, device_id)
         defer.returnValue((200, {}))
 
     @defer.inlineCallbacks
diff --git a/synapse/rest/client/v2_alpha/groups.py b/synapse/rest/client/v2_alpha/groups.py
index 100f47ca9..089ec71c8 100644
--- a/synapse/rest/client/v2_alpha/groups.py
+++ b/synapse/rest/client/v2_alpha/groups.py
@@ -39,20 +39,23 @@ class GroupServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
-        group_description = yield self.groups_handler.get_group_profile(group_id, user_id)
+        group_description = yield self.groups_handler.get_group_profile(
+            group_id,
+            requester_user_id,
+        )
 
         defer.returnValue((200, group_description))
 
     @defer.inlineCallbacks
     def on_POST(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         content = parse_json_object_from_request(request)
         yield self.groups_handler.update_group_profile(
-            group_id, user_id, content,
+            group_id, requester_user_id, content,
         )
 
         defer.returnValue((200, {}))
@@ -72,9 +75,12 @@ class GroupSummaryServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
-        get_group_summary = yield self.groups_handler.get_group_summary(group_id, user_id)
+        get_group_summary = yield self.groups_handler.get_group_summary(
+            group_id,
+            requester_user_id,
+        )
 
         defer.returnValue((200, get_group_summary))
 
@@ -101,11 +107,11 @@ class GroupSummaryRoomsCatServlet(RestServlet):
     @defer.inlineCallbacks
     def on_PUT(self, request, group_id, category_id, room_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         content = parse_json_object_from_request(request)
         resp = yield self.groups_handler.update_group_summary_room(
-            group_id, user_id,
+            group_id, requester_user_id,
             room_id=room_id,
             category_id=category_id,
             content=content,
@@ -116,10 +122,10 @@ class GroupSummaryRoomsCatServlet(RestServlet):
     @defer.inlineCallbacks
     def on_DELETE(self, request, group_id, category_id, room_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         resp = yield self.groups_handler.delete_group_summary_room(
-            group_id, user_id,
+            group_id, requester_user_id,
             room_id=room_id,
             category_id=category_id,
         )
@@ -143,10 +149,10 @@ class GroupCategoryServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id, category_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         category = yield self.groups_handler.get_group_category(
-            group_id, user_id,
+            group_id, requester_user_id,
             category_id=category_id,
         )
 
@@ -155,11 +161,11 @@ class GroupCategoryServlet(RestServlet):
     @defer.inlineCallbacks
     def on_PUT(self, request, group_id, category_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         content = parse_json_object_from_request(request)
         resp = yield self.groups_handler.update_group_category(
-            group_id, user_id,
+            group_id, requester_user_id,
             category_id=category_id,
             content=content,
         )
@@ -169,10 +175,10 @@ class GroupCategoryServlet(RestServlet):
     @defer.inlineCallbacks
     def on_DELETE(self, request, group_id, category_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         resp = yield self.groups_handler.delete_group_category(
-            group_id, user_id,
+            group_id, requester_user_id,
             category_id=category_id,
         )
 
@@ -195,10 +201,10 @@ class GroupCategoriesServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         category = yield self.groups_handler.get_group_categories(
-            group_id, user_id,
+            group_id, requester_user_id,
         )
 
         defer.returnValue((200, category))
@@ -220,10 +226,10 @@ class GroupRoleServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id, role_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         category = yield self.groups_handler.get_group_role(
-            group_id, user_id,
+            group_id, requester_user_id,
             role_id=role_id,
         )
 
@@ -232,11 +238,11 @@ class GroupRoleServlet(RestServlet):
     @defer.inlineCallbacks
     def on_PUT(self, request, group_id, role_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         content = parse_json_object_from_request(request)
         resp = yield self.groups_handler.update_group_role(
-            group_id, user_id,
+            group_id, requester_user_id,
             role_id=role_id,
             content=content,
         )
@@ -246,10 +252,10 @@ class GroupRoleServlet(RestServlet):
     @defer.inlineCallbacks
     def on_DELETE(self, request, group_id, role_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         resp = yield self.groups_handler.delete_group_role(
-            group_id, user_id,
+            group_id, requester_user_id,
             role_id=role_id,
         )
 
@@ -272,10 +278,10 @@ class GroupRolesServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         category = yield self.groups_handler.get_group_roles(
-            group_id, user_id,
+            group_id, requester_user_id,
         )
 
         defer.returnValue((200, category))
@@ -343,9 +349,9 @@ class GroupRoomServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
-        result = yield self.groups_handler.get_rooms_in_group(group_id, user_id)
+        result = yield self.groups_handler.get_rooms_in_group(group_id, requester_user_id)
 
         defer.returnValue((200, result))
 
@@ -364,9 +370,9 @@ class GroupUsersServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
-        result = yield self.groups_handler.get_users_in_group(group_id, user_id)
+        result = yield self.groups_handler.get_users_in_group(group_id, requester_user_id)
 
         defer.returnValue((200, result))
 
@@ -385,9 +391,12 @@ class GroupInvitedUsersServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request, group_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
-        result = yield self.groups_handler.get_invited_users_in_group(group_id, user_id)
+        result = yield self.groups_handler.get_invited_users_in_group(
+            group_id,
+            requester_user_id,
+        )
 
         defer.returnValue((200, result))
 
@@ -407,14 +416,18 @@ class GroupCreateServlet(RestServlet):
     @defer.inlineCallbacks
     def on_POST(self, request):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         # TODO: Create group on remote server
         content = parse_json_object_from_request(request)
         localpart = content.pop("localpart")
         group_id = GroupID(localpart, self.server_name).to_string()
 
-        result = yield self.groups_handler.create_group(group_id, user_id, content)
+        result = yield self.groups_handler.create_group(
+            group_id,
+            requester_user_id,
+            content,
+        )
 
         defer.returnValue((200, result))
 
@@ -435,11 +448,11 @@ class GroupAdminRoomsServlet(RestServlet):
     @defer.inlineCallbacks
     def on_PUT(self, request, group_id, room_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         content = parse_json_object_from_request(request)
         result = yield self.groups_handler.add_room_to_group(
-            group_id, user_id, room_id, content,
+            group_id, requester_user_id, room_id, content,
         )
 
         defer.returnValue((200, result))
@@ -447,10 +460,37 @@ class GroupAdminRoomsServlet(RestServlet):
     @defer.inlineCallbacks
     def on_DELETE(self, request, group_id, room_id):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
         result = yield self.groups_handler.remove_room_from_group(
-            group_id, user_id, room_id,
+            group_id, requester_user_id, room_id,
+        )
+
+        defer.returnValue((200, result))
+
+
+class GroupAdminRoomsConfigServlet(RestServlet):
+    """Update the config of a room in a group
+    """
+    PATTERNS = client_v2_patterns(
+        "/groups/(?P<group_id>[^/]*)/admin/rooms/(?P<room_id>[^/]*)"
+        "/config/(?P<config_key>[^/]*)$"
+    )
+
+    def __init__(self, hs):
+        super(GroupAdminRoomsConfigServlet, self).__init__()
+        self.auth = hs.get_auth()
+        self.clock = hs.get_clock()
+        self.groups_handler = hs.get_groups_local_handler()
+
+    @defer.inlineCallbacks
+    def on_PUT(self, request, group_id, room_id, config_key):
+        requester = yield self.auth.get_user_by_req(request)
+        requester_user_id = requester.user.to_string()
+
+        content = parse_json_object_from_request(request)
+        result = yield self.groups_handler.update_room_in_group(
+            group_id, requester_user_id, room_id, config_key, content,
         )
 
         defer.returnValue((200, result))
@@ -685,9 +725,9 @@ class GroupsForUserServlet(RestServlet):
     @defer.inlineCallbacks
     def on_GET(self, request):
         requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        requester_user_id = requester.user.to_string()
 
-        result = yield self.groups_handler.get_joined_groups(user_id)
+        result = yield self.groups_handler.get_joined_groups(requester_user_id)
 
         defer.returnValue((200, result))
 
@@ -700,6 +740,7 @@ def register_servlets(hs, http_server):
     GroupRoomServlet(hs).register(http_server)
     GroupCreateServlet(hs).register(http_server)
     GroupAdminRoomsServlet(hs).register(http_server)
+    GroupAdminRoomsConfigServlet(hs).register(http_server)
     GroupAdminUsersInviteServlet(hs).register(http_server)
     GroupAdminUsersKickServlet(hs).register(http_server)
     GroupSelfLeaveServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v2_alpha/keys.py b/synapse/rest/client/v2_alpha/keys.py
index 943e87e7f..3cc87ea63 100644
--- a/synapse/rest/client/v2_alpha/keys.py
+++ b/synapse/rest/client/v2_alpha/keys.py
@@ -53,8 +53,7 @@ class KeyUploadServlet(RestServlet):
       },
     }
     """
-    PATTERNS = client_v2_patterns("/keys/upload(/(?P<device_id>[^/]+))?$",
-                                  releases=())
+    PATTERNS = client_v2_patterns("/keys/upload(/(?P<device_id>[^/]+))?$")
 
     def __init__(self, hs):
         """
@@ -128,10 +127,7 @@ class KeyQueryServlet(RestServlet):
     } } } } } }
     """
 
-    PATTERNS = client_v2_patterns(
-        "/keys/query$",
-        releases=()
-    )
+    PATTERNS = client_v2_patterns("/keys/query$")
 
     def __init__(self, hs):
         """
@@ -160,10 +156,7 @@ class KeyChangesServlet(RestServlet):
         200 OK
         { "changed": ["@foo:example.com"] }
     """
-    PATTERNS = client_v2_patterns(
-        "/keys/changes$",
-        releases=()
-    )
+    PATTERNS = client_v2_patterns("/keys/changes$")
 
     def __init__(self, hs):
         """
@@ -213,10 +206,7 @@ class OneTimeKeyServlet(RestServlet):
     } } } }
 
     """
-    PATTERNS = client_v2_patterns(
-        "/keys/claim$",
-        releases=()
-    )
+    PATTERNS = client_v2_patterns("/keys/claim$")
 
     def __init__(self, hs):
         super(OneTimeKeyServlet, self).__init__()
diff --git a/synapse/rest/client/v2_alpha/notifications.py b/synapse/rest/client/v2_alpha/notifications.py
index fd2a3d69d..ec170109f 100644
--- a/synapse/rest/client/v2_alpha/notifications.py
+++ b/synapse/rest/client/v2_alpha/notifications.py
@@ -30,7 +30,7 @@ logger = logging.getLogger(__name__)
 
 
 class NotificationsServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/notifications$", releases=())
+    PATTERNS = client_v2_patterns("/notifications$")
 
     def __init__(self, hs):
         super(NotificationsServlet, self).__init__()
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index d9a8cdbbb..9e2f7308c 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -224,6 +224,12 @@ class RegisterRestServlet(RestServlet):
             # 'user' key not 'username'). Since this is a new addition, we'll
             # fallback to 'username' if they gave one.
             desired_username = body.get("user", desired_username)
+
+            # XXX we should check that desired_username is valid. Currently
+            # we give appservices carte blanche for any insanity in mxids,
+            # because the IRC bridges rely on being able to register stupid
+            # IDs.
+
             access_token = get_access_token_from_request(request)
 
             if isinstance(desired_username, basestring):
@@ -233,6 +239,15 @@ class RegisterRestServlet(RestServlet):
             defer.returnValue((200, result))  # we throw for non 200 responses
             return
 
+        # for either shared secret or regular registration, downcase the
+        # provided username before attempting to register it. This should mean
+        # that people who try to register with upper-case in their usernames
+        # don't get a nasty surprise. (Note that we treat username
+        # case-insenstively in login, so they are free to carry on imagining
+        # that their username is CrAzYh4cKeR if that keeps them happy)
+        if desired_username is not None:
+            desired_username = desired_username.lower()
+
         # == Shared Secret Registration == (e.g. create new user scripts)
         if 'mac' in body:
             # FIXME: Should we really be determining if this is shared secret
@@ -336,6 +351,9 @@ class RegisterRestServlet(RestServlet):
             new_password = params.get("password", None)
             guest_access_token = params.get("guest_access_token", None)
 
+            if desired_username is not None:
+                desired_username = desired_username.lower()
+
             (registered_user_id, _) = yield self.registration_handler.register(
                 localpart=desired_username,
                 password=new_password,
@@ -417,13 +435,22 @@ class RegisterRestServlet(RestServlet):
     def _do_shared_secret_registration(self, username, password, body):
         if not self.hs.config.registration_shared_secret:
             raise SynapseError(400, "Shared secret registration is not enabled")
+        if not username:
+            raise SynapseError(
+                400, "username must be specified", errcode=Codes.BAD_JSON,
+            )
 
-        user = username.encode("utf-8")
+        # use the username from the original request rather than the
+        # downcased one in `username` for the mac calculation
+        user = body["username"].encode("utf-8")
 
         # str() because otherwise hmac complains that 'unicode' does not
         # have the buffer interface
         got_mac = str(body["mac"])
 
+        # FIXME this is different to the /v1/register endpoint, which
+        # includes the password and admin flag in the hashed text. Why are
+        # these different?
         want_mac = hmac.new(
             key=self.hs.config.registration_shared_secret,
             msg=user,
@@ -557,25 +584,28 @@ class RegisterRestServlet(RestServlet):
         Args:
             (str) user_id: full canonical @user:id
             (object) params: registration parameters, from which we pull
-                device_id and initial_device_name
+                device_id, initial_device_name and inhibit_login
         Returns:
             defer.Deferred: (object) dictionary for response from /register
         """
-        device_id = yield self._register_device(user_id, params)
-
-        access_token = (
-            yield self.auth_handler.get_access_token_for_user_id(
-                user_id, device_id=device_id,
-                initial_display_name=params.get("initial_device_display_name")
-            )
-        )
-
-        defer.returnValue({
+        result = {
             "user_id": user_id,
-            "access_token": access_token,
             "home_server": self.hs.hostname,
-            "device_id": device_id,
-        })
+        }
+        if not params.get("inhibit_login", False):
+            device_id = yield self._register_device(user_id, params)
+
+            access_token = (
+                yield self.auth_handler.get_access_token_for_user_id(
+                    user_id, device_id=device_id,
+                )
+            )
+
+            result.update({
+                "access_token": access_token,
+                "device_id": device_id,
+            })
+        defer.returnValue(result)
 
     def _register_device(self, user_id, params):
         """Register a device for a user.
diff --git a/synapse/rest/client/v2_alpha/sendtodevice.py b/synapse/rest/client/v2_alpha/sendtodevice.py
index d607bd297..90bdb1db1 100644
--- a/synapse/rest/client/v2_alpha/sendtodevice.py
+++ b/synapse/rest/client/v2_alpha/sendtodevice.py
@@ -29,7 +29,7 @@ logger = logging.getLogger(__name__)
 class SendToDeviceRestServlet(servlet.RestServlet):
     PATTERNS = client_v2_patterns(
         "/sendToDevice/(?P<message_type>[^/]*)/(?P<txn_id>[^/]*)$",
-        releases=[], v2_alpha=False
+        v2_alpha=False
     )
 
     def __init__(self, hs):
diff --git a/synapse/rest/client/v2_alpha/thirdparty.py b/synapse/rest/client/v2_alpha/thirdparty.py
index 6fceb23e2..6773b9ba6 100644
--- a/synapse/rest/client/v2_alpha/thirdparty.py
+++ b/synapse/rest/client/v2_alpha/thirdparty.py
@@ -26,7 +26,7 @@ logger = logging.getLogger(__name__)
 
 
 class ThirdPartyProtocolsServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/thirdparty/protocols", releases=())
+    PATTERNS = client_v2_patterns("/thirdparty/protocols")
 
     def __init__(self, hs):
         super(ThirdPartyProtocolsServlet, self).__init__()
@@ -43,8 +43,7 @@ class ThirdPartyProtocolsServlet(RestServlet):
 
 
 class ThirdPartyProtocolServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/thirdparty/protocol/(?P<protocol>[^/]+)$",
-                                  releases=())
+    PATTERNS = client_v2_patterns("/thirdparty/protocol/(?P<protocol>[^/]+)$")
 
     def __init__(self, hs):
         super(ThirdPartyProtocolServlet, self).__init__()
@@ -66,8 +65,7 @@ class ThirdPartyProtocolServlet(RestServlet):
 
 
 class ThirdPartyUserServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/thirdparty/user(/(?P<protocol>[^/]+))?$",
-                                  releases=())
+    PATTERNS = client_v2_patterns("/thirdparty/user(/(?P<protocol>[^/]+))?$")
 
     def __init__(self, hs):
         super(ThirdPartyUserServlet, self).__init__()
@@ -90,8 +88,7 @@ class ThirdPartyUserServlet(RestServlet):
 
 
 class ThirdPartyLocationServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/thirdparty/location(/(?P<protocol>[^/]+))?$",
-                                  releases=())
+    PATTERNS = client_v2_patterns("/thirdparty/location(/(?P<protocol>[^/]+))?$")
 
     def __init__(self, hs):
         super(ThirdPartyLocationServlet, self).__init__()
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 80114fca0..723f7043f 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -20,6 +20,7 @@ from twisted.web.resource import Resource
 from synapse.api.errors import (
     SynapseError, Codes,
 )
+from synapse.util.logcontext import preserve_fn, make_deferred_yieldable
 from synapse.util.stringutils import random_string
 from synapse.util.caches.expiringcache import ExpiringCache
 from synapse.http.client import SpiderHttpClient
@@ -63,16 +64,15 @@ class PreviewUrlResource(Resource):
 
         self.url_preview_url_blacklist = hs.config.url_preview_url_blacklist
 
-        # simple memory cache mapping urls to OG metadata
-        self.cache = ExpiringCache(
+        # memory cache mapping urls to an ObservableDeferred returning
+        # JSON-encoded OG metadata
+        self._cache = ExpiringCache(
             cache_name="url_previews",
             clock=self.clock,
             # don't spider URLs more often than once an hour
             expiry_ms=60 * 60 * 1000,
         )
-        self.cache.start()
-
-        self.downloads = {}
+        self._cache.start()
 
         self._cleaner_loop = self.clock.looping_call(
             self._expire_url_cache_data, 10 * 1000
@@ -94,6 +94,7 @@ class PreviewUrlResource(Resource):
         else:
             ts = self.clock.time_msec()
 
+        # XXX: we could move this into _do_preview if we wanted.
         url_tuple = urlparse.urlsplit(url)
         for entry in self.url_preview_url_blacklist:
             match = True
@@ -126,14 +127,42 @@ class PreviewUrlResource(Resource):
                     Codes.UNKNOWN
                 )
 
-        # first check the memory cache - good to handle all the clients on this
-        # HS thundering away to preview the same URL at the same time.
-        og = self.cache.get(url)
-        if og:
-            respond_with_json_bytes(request, 200, json.dumps(og), send_cors=True)
-            return
+        # the in-memory cache:
+        # * ensures that only one request is active at a time
+        # * takes load off the DB for the thundering herds
+        # * also caches any failures (unlike the DB) so we don't keep
+        #    requesting the same endpoint
 
-        # then check the URL cache in the DB (which will also provide us with
+        observable = self._cache.get(url)
+
+        if not observable:
+            download = preserve_fn(self._do_preview)(
+                url, requester.user, ts,
+            )
+            observable = ObservableDeferred(
+                download,
+                consumeErrors=True
+            )
+            self._cache[url] = observable
+        else:
+            logger.info("Returning cached response")
+
+        og = yield make_deferred_yieldable(observable.observe())
+        respond_with_json_bytes(request, 200, og, send_cors=True)
+
+    @defer.inlineCallbacks
+    def _do_preview(self, url, user, ts):
+        """Check the db, and download the URL and build a preview
+
+        Args:
+            url (str):
+            user (str):
+            ts (int):
+
+        Returns:
+            Deferred[str]: json-encoded og data
+        """
+        # check the URL cache in the DB (which will also provide us with
         # historical previews, if we have any)
         cache_result = yield self.store.get_url_cache(url, ts)
         if (
@@ -141,32 +170,10 @@ class PreviewUrlResource(Resource):
             cache_result["expires_ts"] > ts and
             cache_result["response_code"] / 100 == 2
         ):
-            respond_with_json_bytes(
-                request, 200, cache_result["og"].encode('utf-8'),
-                send_cors=True
-            )
+            defer.returnValue(cache_result["og"])
             return
 
-        # Ensure only one download for a given URL is active at a time
-        download = self.downloads.get(url)
-        if download is None:
-            download = self._download_url(url, requester.user)
-            download = ObservableDeferred(
-                download,
-                consumeErrors=True
-            )
-            self.downloads[url] = download
-
-            @download.addBoth
-            def callback(media_info):
-                del self.downloads[url]
-                return media_info
-        media_info = yield download.observe()
-
-        # FIXME: we should probably update our cache now anyway, so that
-        # even if the OG calculation raises, we don't keep hammering on the
-        # remote server.  For now, leave it uncached to aid debugging OG
-        # calculation problems
+        media_info = yield self._download_url(url, user)
 
         logger.debug("got media_info of '%s'" % media_info)
 
@@ -212,7 +219,7 @@ class PreviewUrlResource(Resource):
             # just rely on the caching on the master request to speed things up.
             if 'og:image' in og and og['og:image']:
                 image_info = yield self._download_url(
-                    _rebase_url(og['og:image'], media_info['uri']), requester.user
+                    _rebase_url(og['og:image'], media_info['uri']), user
                 )
 
                 if _is_media(image_info['media_type']):
@@ -239,8 +246,7 @@ class PreviewUrlResource(Resource):
 
         logger.debug("Calculated OG for %s as %s" % (url, og))
 
-        # store OG in ephemeral in-memory cache
-        self.cache[url] = og
+        jsonog = json.dumps(og)
 
         # store OG in history-aware DB cache
         yield self.store.store_url_cache(
@@ -248,12 +254,12 @@ class PreviewUrlResource(Resource):
             media_info["response_code"],
             media_info["etag"],
             media_info["expires"] + media_info["created_ts"],
-            json.dumps(og),
+            jsonog,
             media_info["filesystem_id"],
             media_info["created_ts"],
         )
 
-        respond_with_json_bytes(request, 200, json.dumps(og), send_cors=True)
+        defer.returnValue(jsonog)
 
     @defer.inlineCallbacks
     def _download_url(self, url, user):
@@ -520,7 +526,14 @@ def _calc_og(tree, media_uri):
             from lxml import etree
 
             TAGS_TO_REMOVE = (
-                "header", "nav", "aside", "footer", "script", "style", etree.Comment
+                "header",
+                "nav",
+                "aside",
+                "footer",
+                "script",
+                "noscript",
+                "style",
+                etree.Comment
             )
 
             # Split all the text nodes into paragraphs (by splitting on new
diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 594566eb3..d01d46338 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -268,7 +268,7 @@ class DataStore(RoomMemberStore, RoomStore,
         self._stream_order_on_start = self.get_room_max_stream_ordering()
         self._min_stream_order_on_start = self.get_room_min_stream_ordering()
 
-        super(DataStore, self).__init__(hs)
+        super(DataStore, self).__init__(db_conn, hs)
 
     def take_presence_startup_info(self):
         active_on_startup = self._presence_on_startup
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index 6caf7b335..e94917d9c 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -162,7 +162,7 @@ class PerformanceCounters(object):
 class SQLBaseStore(object):
     _TXN_ID = 0
 
-    def __init__(self, hs):
+    def __init__(self, db_conn, hs):
         self.hs = hs
         self._clock = hs.get_clock()
         self._db_pool = hs.get_db_pool()
diff --git a/synapse/storage/account_data.py b/synapse/storage/account_data.py
index ff14e54c1..c8a1eb016 100644
--- a/synapse/storage/account_data.py
+++ b/synapse/storage/account_data.py
@@ -63,7 +63,7 @@ class AccountDataStore(SQLBaseStore):
             "get_account_data_for_user", get_account_data_for_user_txn
         )
 
-    @cachedInlineCallbacks(num_args=2)
+    @cachedInlineCallbacks(num_args=2, max_entries=5000)
     def get_global_account_data_by_type_for_user(self, data_type, user_id):
         """
         Returns:
diff --git a/synapse/storage/appservice.py b/synapse/storage/appservice.py
index c63935cb0..d8c84b714 100644
--- a/synapse/storage/appservice.py
+++ b/synapse/storage/appservice.py
@@ -48,8 +48,8 @@ def _make_exclusive_regex(services_cache):
 
 class ApplicationServiceStore(SQLBaseStore):
 
-    def __init__(self, hs):
-        super(ApplicationServiceStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(ApplicationServiceStore, self).__init__(db_conn, hs)
         self.hostname = hs.hostname
         self.services_cache = load_appservices(
             hs.hostname,
@@ -173,8 +173,8 @@ class ApplicationServiceStore(SQLBaseStore):
 
 class ApplicationServiceTransactionStore(SQLBaseStore):
 
-    def __init__(self, hs):
-        super(ApplicationServiceTransactionStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(ApplicationServiceTransactionStore, self).__init__(db_conn, hs)
 
     @defer.inlineCallbacks
     def get_appservices_by_state(self, state):
diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py
index a6e6f52a6..6f235ac05 100644
--- a/synapse/storage/background_updates.py
+++ b/synapse/storage/background_updates.py
@@ -80,8 +80,8 @@ class BackgroundUpdateStore(SQLBaseStore):
     BACKGROUND_UPDATE_INTERVAL_MS = 1000
     BACKGROUND_UPDATE_DURATION_MS = 100
 
-    def __init__(self, hs):
-        super(BackgroundUpdateStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(BackgroundUpdateStore, self).__init__(db_conn, hs)
         self._background_update_performance = {}
         self._background_update_queue = []
         self._background_update_handlers = {}
diff --git a/synapse/storage/client_ips.py b/synapse/storage/client_ips.py
index 3c95e90ec..a03d1d610 100644
--- a/synapse/storage/client_ips.py
+++ b/synapse/storage/client_ips.py
@@ -32,14 +32,14 @@ LAST_SEEN_GRANULARITY = 120 * 1000
 
 
 class ClientIpStore(background_updates.BackgroundUpdateStore):
-    def __init__(self, hs):
+    def __init__(self, db_conn, hs):
         self.client_ip_last_seen = Cache(
             name="client_ip_last_seen",
             keylen=4,
             max_entries=50000 * CACHE_SIZE_FACTOR,
         )
 
-        super(ClientIpStore, self).__init__(hs)
+        super(ClientIpStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             "user_ips_device_index",
diff --git a/synapse/storage/deviceinbox.py b/synapse/storage/deviceinbox.py
index 0b62b493d..548e795da 100644
--- a/synapse/storage/deviceinbox.py
+++ b/synapse/storage/deviceinbox.py
@@ -29,8 +29,8 @@ logger = logging.getLogger(__name__)
 class DeviceInboxStore(BackgroundUpdateStore):
     DEVICE_INBOX_STREAM_ID = "device_inbox_stream_drop"
 
-    def __init__(self, hs):
-        super(DeviceInboxStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(DeviceInboxStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             "device_inbox_stream_index",
diff --git a/synapse/storage/devices.py b/synapse/storage/devices.py
index bb27fd1f7..bd2effdf3 100644
--- a/synapse/storage/devices.py
+++ b/synapse/storage/devices.py
@@ -26,8 +26,8 @@ logger = logging.getLogger(__name__)
 
 
 class DeviceStore(SQLBaseStore):
-    def __init__(self, hs):
-        super(DeviceStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(DeviceStore, self).__init__(db_conn, hs)
 
         # Map of (user_id, device_id) -> bool. If there is an entry that implies
         # the device exists.
diff --git a/synapse/storage/event_federation.py b/synapse/storage/event_federation.py
index e8133de2f..55a05c59d 100644
--- a/synapse/storage/event_federation.py
+++ b/synapse/storage/event_federation.py
@@ -39,8 +39,8 @@ class EventFederationStore(SQLBaseStore):
 
     EVENT_AUTH_STATE_ONLY = "event_auth_state_only"
 
-    def __init__(self, hs):
-        super(EventFederationStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(EventFederationStore, self).__init__(db_conn, hs)
 
         self.register_background_update_handler(
             self.EVENT_AUTH_STATE_ONLY,
diff --git a/synapse/storage/event_push_actions.py b/synapse/storage/event_push_actions.py
index d6d8723b4..8efe2fd4b 100644
--- a/synapse/storage/event_push_actions.py
+++ b/synapse/storage/event_push_actions.py
@@ -65,8 +65,8 @@ def _deserialize_action(actions, is_highlight):
 class EventPushActionsStore(SQLBaseStore):
     EPA_HIGHLIGHT_INDEX = "epa_highlight_index"
 
-    def __init__(self, hs):
-        super(EventPushActionsStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(EventPushActionsStore, self).__init__(db_conn, hs)
 
         self.register_background_index_update(
             self.EPA_HIGHLIGHT_INDEX,
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 4298d8baf..d08f7571d 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -197,8 +197,8 @@ class EventsStore(SQLBaseStore):
     EVENT_ORIGIN_SERVER_TS_NAME = "event_origin_server_ts"
     EVENT_FIELDS_SENDER_URL_UPDATE_NAME = "event_fields_sender_url"
 
-    def __init__(self, hs):
-        super(EventsStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(EventsStore, self).__init__(db_conn, hs)
         self._clock = hs.get_clock()
         self.register_background_update_handler(
             self.EVENT_ORIGIN_SERVER_TS_NAME, self._background_reindex_origin_server_ts
diff --git a/synapse/storage/group_server.py b/synapse/storage/group_server.py
index 9e63db5c6..8fde1aab8 100644
--- a/synapse/storage/group_server.py
+++ b/synapse/storage/group_server.py
@@ -35,7 +35,9 @@ class GroupServerStore(SQLBaseStore):
             keyvalues={
                 "group_id": group_id,
             },
-            retcols=("name", "short_description", "long_description", "avatar_url",),
+            retcols=(
+                "name", "short_description", "long_description", "avatar_url", "is_public"
+            ),
             allow_none=True,
             desc="is_user_in_group",
         )
@@ -52,7 +54,7 @@ class GroupServerStore(SQLBaseStore):
         return self._simple_select_list(
             table="group_users",
             keyvalues=keyvalues,
-            retcols=("user_id", "is_public",),
+            retcols=("user_id", "is_public", "is_admin",),
             desc="get_users_in_group",
         )
 
@@ -855,6 +857,19 @@ class GroupServerStore(SQLBaseStore):
             desc="add_room_to_group",
         )
 
+    def update_room_in_group_visibility(self, group_id, room_id, is_public):
+        return self._simple_update(
+            table="group_rooms",
+            keyvalues={
+                "group_id": group_id,
+                "room_id": room_id,
+            },
+            updatevalues={
+                "is_public": is_public,
+            },
+            desc="update_room_in_group_visibility",
+        )
+
     def remove_room_from_group(self, group_id, room_id):
         def _remove_room_from_group_txn(txn):
             self._simple_delete_txn(
@@ -1026,6 +1041,7 @@ class GroupServerStore(SQLBaseStore):
                 "avatar_url": avatar_url,
                 "short_description": short_description,
                 "long_description": long_description,
+                "is_public": True,
             },
             desc="create_group",
         )
@@ -1086,6 +1102,24 @@ class GroupServerStore(SQLBaseStore):
             desc="update_remote_attestion",
         )
 
+    def remove_attestation_renewal(self, group_id, user_id):
+        """Remove an attestation that we thought we should renew, but actually
+        shouldn't. Ideally this would never get called as we would never
+        incorrectly try and do attestations for local users on local groups.
+
+        Args:
+            group_id (str)
+            user_id (str)
+        """
+        return self._simple_delete(
+            table="group_attestations_renewals",
+            keyvalues={
+                "group_id": group_id,
+                "user_id": user_id,
+            },
+            desc="remove_attestation_renewal",
+        )
+
     @defer.inlineCallbacks
     def get_remote_attestation(self, group_id, user_id):
         """Get the attestation that proves the remote agrees that the user is
diff --git a/synapse/storage/media_repository.py b/synapse/storage/media_repository.py
index 7110a7127..52e5cdad7 100644
--- a/synapse/storage/media_repository.py
+++ b/synapse/storage/media_repository.py
@@ -254,6 +254,9 @@ class MediaRepositoryStore(SQLBaseStore):
         return self.runInteraction("get_expired_url_cache", _get_expired_url_cache_txn)
 
     def delete_url_cache(self, media_ids):
+        if len(media_ids) == 0:
+            return
+
         sql = (
             "DELETE FROM local_media_repository_url_cache"
             " WHERE media_id = ?"
@@ -281,6 +284,9 @@ class MediaRepositoryStore(SQLBaseStore):
         )
 
     def delete_url_cache_media(self, media_ids):
+        if len(media_ids) == 0:
+            return
+
         def _delete_url_cache_media_txn(txn):
             sql = (
                 "DELETE FROM local_media_repository"
diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index 817c2185c..d1691bbac 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 
 # Remember to update this number every time a change is made to database
 # schema files, so the users will be informed on server restarts.
-SCHEMA_VERSION = 45
+SCHEMA_VERSION = 46
 
 dir_path = os.path.abspath(os.path.dirname(__file__))
 
@@ -44,6 +44,13 @@ def prepare_database(db_conn, database_engine, config):
 
     If `config` is None then prepare_database will assert that no upgrade is
     necessary, *or* will create a fresh database if the database is empty.
+
+    Args:
+        db_conn:
+        database_engine:
+        config (synapse.config.homeserver.HomeServerConfig|None):
+            application config, or None if we are connecting to an existing
+            database which we expect to be configured already
     """
     try:
         cur = db_conn.cursor()
@@ -64,6 +71,10 @@ def prepare_database(db_conn, database_engine, config):
         else:
             _setup_new_database(cur, database_engine)
 
+        # check if any of our configured dynamic modules want a database
+        if config is not None:
+            _apply_module_schemas(cur, database_engine, config)
+
         cur.close()
         db_conn.commit()
     except Exception:
@@ -283,6 +294,65 @@ def _upgrade_existing_database(cur, current_version, applied_delta_files,
             )
 
 
+def _apply_module_schemas(txn, database_engine, config):
+    """Apply the module schemas for the dynamic modules, if any
+
+    Args:
+        cur: database cursor
+        database_engine: synapse database engine class
+        config (synapse.config.homeserver.HomeServerConfig):
+            application config
+    """
+    for (mod, _config) in config.password_providers:
+        if not hasattr(mod, 'get_db_schema_files'):
+            continue
+        modname = ".".join((mod.__module__, mod.__name__))
+        _apply_module_schema_files(
+            txn, database_engine, modname, mod.get_db_schema_files(),
+        )
+
+
+def _apply_module_schema_files(cur, database_engine, modname, names_and_streams):
+    """Apply the module schemas for a single module
+
+    Args:
+        cur: database cursor
+        database_engine: synapse database engine class
+        modname (str): fully qualified name of the module
+        names_and_streams (Iterable[(str, file)]): the names and streams of
+            schemas to be applied
+    """
+    cur.execute(
+        database_engine.convert_param_style(
+            "SELECT file FROM applied_module_schemas WHERE module_name = ?"
+        ),
+        (modname,)
+    )
+    applied_deltas = set(d for d, in cur)
+    for (name, stream) in names_and_streams:
+        if name in applied_deltas:
+            continue
+
+        root_name, ext = os.path.splitext(name)
+        if ext != '.sql':
+            raise PrepareDatabaseException(
+                "only .sql files are currently supported for module schemas",
+            )
+
+        logger.info("applying schema %s for %s", name, modname)
+        for statement in get_statements(stream):
+            cur.execute(statement)
+
+        # Mark as done.
+        cur.execute(
+            database_engine.convert_param_style(
+                "INSERT INTO applied_module_schemas (module_name, file)"
+                " VALUES (?,?)",
+            ),
+            (modname, name)
+        )
+
+
 def get_statements(f):
     statement_buffer = ""
     in_comment = False  # If we're in a /* ... */ style comment
diff --git a/synapse/storage/receipts.py b/synapse/storage/receipts.py
index f42b8014c..12b3cc7f5 100644
--- a/synapse/storage/receipts.py
+++ b/synapse/storage/receipts.py
@@ -27,8 +27,8 @@ logger = logging.getLogger(__name__)
 
 
 class ReceiptsStore(SQLBaseStore):
-    def __init__(self, hs):
-        super(ReceiptsStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(ReceiptsStore, self).__init__(db_conn, hs)
 
         self._receipts_stream_cache = StreamChangeCache(
             "ReceiptsRoomChangeCache", self._receipts_id_gen.get_current_token()
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py
index 20acd58fc..8b9544c20 100644
--- a/synapse/storage/registration.py
+++ b/synapse/storage/registration.py
@@ -24,8 +24,8 @@ from synapse.util.caches.descriptors import cached, cachedInlineCallbacks
 
 class RegistrationStore(background_updates.BackgroundUpdateStore):
 
-    def __init__(self, hs):
-        super(RegistrationStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(RegistrationStore, self).__init__(db_conn, hs)
 
         self.clock = hs.get_clock()
 
@@ -36,12 +36,15 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
             columns=["user_id", "device_id"],
         )
 
-        self.register_background_index_update(
-            "refresh_tokens_device_index",
-            index_name="refresh_tokens_device_id",
-            table="refresh_tokens",
-            columns=["user_id", "device_id"],
-        )
+        # we no longer use refresh tokens, but it's possible that some people
+        # might have a background update queued to build this index. Just
+        # clear the background update.
+        @defer.inlineCallbacks
+        def noop_update(progress, batch_size):
+            yield self._end_background_update("refresh_tokens_device_index")
+            defer.returnValue(1)
+        self.register_background_update_handler(
+            "refresh_tokens_device_index", noop_update)
 
     @defer.inlineCallbacks
     def add_access_token_to_user(self, user_id, token, device_id=None):
@@ -177,9 +180,11 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
             )
 
         if create_profile_with_localpart:
+            # set a default displayname serverside to avoid ugly race
+            # between auto-joins and clients trying to set displaynames
             txn.execute(
-                "INSERT INTO profiles(user_id) VALUES (?)",
-                (create_profile_with_localpart,)
+                "INSERT INTO profiles(user_id, displayname) VALUES (?,?)",
+                (create_profile_with_localpart, create_profile_with_localpart)
             )
 
         self._invalidate_cache_and_stream(
@@ -236,12 +241,10 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
             "user_set_password_hash", user_set_password_hash_txn
         )
 
-    @defer.inlineCallbacks
     def user_delete_access_tokens(self, user_id, except_token_id=None,
-                                  device_id=None,
-                                  delete_refresh_tokens=False):
+                                  device_id=None):
         """
-        Invalidate access/refresh tokens belonging to a user
+        Invalidate access tokens belonging to a user
 
         Args:
             user_id (str):  ID of user the tokens belong to
@@ -250,10 +253,9 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
             device_id (str|None):  ID of device the tokens are associated with.
                 If None, tokens associated with any device (or no device) will
                 be deleted
-            delete_refresh_tokens (bool):  True to delete refresh tokens as
-                well as access tokens.
         Returns:
-            defer.Deferred:
+            defer.Deferred[list[str, str|None]]: a list of the deleted tokens
+                and device IDs
         """
         def f(txn):
             keyvalues = {
@@ -262,13 +264,6 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
             if device_id is not None:
                 keyvalues["device_id"] = device_id
 
-            if delete_refresh_tokens:
-                self._simple_delete_txn(
-                    txn,
-                    table="refresh_tokens",
-                    keyvalues=keyvalues,
-                )
-
             items = keyvalues.items()
             where_clause = " AND ".join(k + " = ?" for k, _ in items)
             values = [v for _, v in items]
@@ -277,14 +272,14 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
                 values.append(except_token_id)
 
             txn.execute(
-                "SELECT token FROM access_tokens WHERE %s" % where_clause,
+                "SELECT token, device_id FROM access_tokens WHERE %s" % where_clause,
                 values
             )
-            rows = self.cursor_to_dict(txn)
+            tokens_and_devices = [(r[0], r[1]) for r in txn]
 
-            for row in rows:
+            for token, _ in tokens_and_devices:
                 self._invalidate_cache_and_stream(
-                    txn, self.get_user_by_access_token, (row["token"],)
+                    txn, self.get_user_by_access_token, (token,)
                 )
 
             txn.execute(
@@ -292,7 +287,9 @@ class RegistrationStore(background_updates.BackgroundUpdateStore):
                 values
             )
 
-        yield self.runInteraction(
+            return tokens_and_devices
+
+        return self.runInteraction(
             "user_delete_access_tokens", f,
         )
 
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 3fa8019eb..3e77fd390 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -49,8 +49,8 @@ _MEMBERSHIP_PROFILE_UPDATE_NAME = "room_membership_profile_update"
 
 
 class RoomMemberStore(SQLBaseStore):
-    def __init__(self, hs):
-        super(RoomMemberStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(RoomMemberStore, self).__init__(db_conn, hs)
         self.register_background_update_handler(
             _MEMBERSHIP_PROFILE_UPDATE_NAME, self._background_add_membership_profile
         )
diff --git a/synapse/storage/schema/delta/33/refreshtoken_device_index.sql b/synapse/storage/schema/delta/33/refreshtoken_device_index.sql
deleted file mode 100644
index bb225dafb..000000000
--- a/synapse/storage/schema/delta/33/refreshtoken_device_index.sql
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Copyright 2016 OpenMarket Ltd
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-INSERT INTO background_updates (update_name, progress_json) VALUES
-  ('refresh_tokens_device_index', '{}');
diff --git a/synapse/storage/schema/delta/43/user_share.sql b/synapse/storage/schema/delta/43/user_share.sql
index 4501d90cb..ee7062abe 100644
--- a/synapse/storage/schema/delta/43/user_share.sql
+++ b/synapse/storage/schema/delta/43/user_share.sql
@@ -29,5 +29,5 @@ CREATE INDEX users_who_share_rooms_r_idx ON users_who_share_rooms(room_id);
 CREATE INDEX users_who_share_rooms_o_idx ON users_who_share_rooms(other_user_id);
 
 
--- Make sure that we popualte the table initially
+-- Make sure that we populate the table initially
 UPDATE user_directory_stream_pos SET stream_id = NULL;
diff --git a/synapse/storage/schema/delta/33/refreshtoken_device.sql b/synapse/storage/schema/delta/46/drop_refresh_tokens.sql
similarity index 81%
rename from synapse/storage/schema/delta/33/refreshtoken_device.sql
rename to synapse/storage/schema/delta/46/drop_refresh_tokens.sql
index 290bd6da8..68c48a89a 100644
--- a/synapse/storage/schema/delta/33/refreshtoken_device.sql
+++ b/synapse/storage/schema/delta/46/drop_refresh_tokens.sql
@@ -1,4 +1,4 @@
-/* Copyright 2016 OpenMarket Ltd
+/* Copyright 2017 New Vector Ltd
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,4 +13,5 @@
  * limitations under the License.
  */
 
-ALTER TABLE refresh_tokens ADD COLUMN device_id TEXT;
+/* we no longer use (or create) the refresh_tokens table */
+DROP TABLE IF EXISTS refresh_tokens;
diff --git a/synapse/storage/schema/delta/46/group_server.sql b/synapse/storage/schema/delta/46/group_server.sql
new file mode 100644
index 000000000..097679bc9
--- /dev/null
+++ b/synapse/storage/schema/delta/46/group_server.sql
@@ -0,0 +1,32 @@
+/* Copyright 2017 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE TABLE groups_new (
+    group_id TEXT NOT NULL,
+    name TEXT,  -- the display name of the room
+    avatar_url TEXT,
+    short_description TEXT,
+    long_description TEXT,
+    is_public BOOL NOT NULL -- whether non-members can access group APIs
+);
+
+-- NB: awful hack to get the default to be true on postgres and 1 on sqlite
+INSERT INTO groups_new
+    SELECT group_id, name, avatar_url, short_description, long_description, (1=1) FROM groups;
+
+DROP TABLE groups;
+ALTER TABLE groups_new RENAME TO groups;
+
+CREATE UNIQUE INDEX groups_idx ON groups(group_id);
diff --git a/synapse/storage/schema/delta/23/refresh_tokens.sql b/synapse/storage/schema/delta/46/user_dir_typos.sql
similarity index 51%
rename from synapse/storage/schema/delta/23/refresh_tokens.sql
rename to synapse/storage/schema/delta/46/user_dir_typos.sql
index 34db0cf12..d9505f8da 100644
--- a/synapse/storage/schema/delta/23/refresh_tokens.sql
+++ b/synapse/storage/schema/delta/46/user_dir_typos.sql
@@ -1,4 +1,4 @@
-/* Copyright 2015, 2016 OpenMarket Ltd
+/* Copyright 2017 New Vector Ltd
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,9 +13,12 @@
  * limitations under the License.
  */
 
-CREATE TABLE IF NOT EXISTS refresh_tokens(
-    id INTEGER PRIMARY KEY,
-    token TEXT NOT NULL,
-    user_id TEXT NOT NULL,
-    UNIQUE (token)
-);
+-- this is just embarassing :|
+ALTER TABLE users_in_pubic_room RENAME TO users_in_public_rooms;
+
+-- this is only 300K rows on matrix.org and takes ~3s to generate the index,
+-- so is hopefully not going to block anyone else for that long...
+CREATE INDEX users_in_public_rooms_room_idx ON users_in_public_rooms(room_id);
+CREATE UNIQUE INDEX users_in_public_rooms_user_idx ON users_in_public_rooms(user_id);
+DROP INDEX users_in_pubic_room_room_idx;
+DROP INDEX users_in_pubic_room_user_idx;
diff --git a/synapse/storage/schema/schema_version.sql b/synapse/storage/schema/schema_version.sql
index a7ade6998..42e5cb6df 100644
--- a/synapse/storage/schema/schema_version.sql
+++ b/synapse/storage/schema/schema_version.sql
@@ -25,3 +25,10 @@ CREATE TABLE IF NOT EXISTS applied_schema_deltas(
     file TEXT NOT NULL,
     UNIQUE(version, file)
 );
+
+-- a list of schema files we have loaded on behalf of dynamic modules
+CREATE TABLE IF NOT EXISTS applied_module_schemas(
+    module_name TEXT NOT NULL,
+    file TEXT NOT NULL,
+    UNIQUE(module_name, file)
+);
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index 05d4ef586..479b04c63 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -33,8 +33,8 @@ class SearchStore(BackgroundUpdateStore):
     EVENT_SEARCH_ORDER_UPDATE_NAME = "event_search_order"
     EVENT_SEARCH_USE_GIST_POSTGRES_NAME = "event_search_postgres_gist"
 
-    def __init__(self, hs):
-        super(SearchStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(SearchStore, self).__init__(db_conn, hs)
         self.register_background_update_handler(
             self.EVENT_SEARCH_UPDATE_NAME, self._background_reindex_search
         )
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 5673e4aa9..dd01b6876 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -63,8 +63,8 @@ class StateStore(SQLBaseStore):
     STATE_GROUP_INDEX_UPDATE_NAME = "state_group_state_type_index"
     CURRENT_STATE_INDEX_UPDATE_NAME = "current_state_members_idx"
 
-    def __init__(self, hs):
-        super(StateStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(StateStore, self).__init__(db_conn, hs)
         self.register_background_update_handler(
             self.STATE_GROUP_DEDUPLICATION_UPDATE_NAME,
             self._background_deduplicate_state,
diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py
index 809fdd311..8f61f7ffa 100644
--- a/synapse/storage/transactions.py
+++ b/synapse/storage/transactions.py
@@ -46,8 +46,8 @@ class TransactionStore(SQLBaseStore):
     """A collection of queries for handling PDUs.
     """
 
-    def __init__(self, hs):
-        super(TransactionStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(TransactionStore, self).__init__(db_conn, hs)
 
         self._clock.looping_call(self._cleanup_transactions, 30 * 60 * 1000)
 
diff --git a/synapse/storage/user_directory.py b/synapse/storage/user_directory.py
index 2a4db3f03..5dc5b9582 100644
--- a/synapse/storage/user_directory.py
+++ b/synapse/storage/user_directory.py
@@ -63,7 +63,7 @@ class UserDirectoryStore(SQLBaseStore):
             user_ids (list(str)): Users to add
         """
         yield self._simple_insert_many(
-            table="users_in_pubic_room",
+            table="users_in_public_rooms",
             values=[
                 {
                     "user_id": user_id,
@@ -219,7 +219,7 @@ class UserDirectoryStore(SQLBaseStore):
     @defer.inlineCallbacks
     def update_user_in_public_user_list(self, user_id, room_id):
         yield self._simple_update_one(
-            table="users_in_pubic_room",
+            table="users_in_public_rooms",
             keyvalues={"user_id": user_id},
             updatevalues={"room_id": room_id},
             desc="update_user_in_public_user_list",
@@ -240,7 +240,7 @@ class UserDirectoryStore(SQLBaseStore):
             )
             self._simple_delete_txn(
                 txn,
-                table="users_in_pubic_room",
+                table="users_in_public_rooms",
                 keyvalues={"user_id": user_id},
             )
             txn.call_after(
@@ -256,7 +256,7 @@ class UserDirectoryStore(SQLBaseStore):
     @defer.inlineCallbacks
     def remove_from_user_in_public_room(self, user_id):
         yield self._simple_delete(
-            table="users_in_pubic_room",
+            table="users_in_public_rooms",
             keyvalues={"user_id": user_id},
             desc="remove_from_user_in_public_room",
         )
@@ -267,7 +267,7 @@ class UserDirectoryStore(SQLBaseStore):
         in the given room_id
         """
         return self._simple_select_onecol(
-            table="users_in_pubic_room",
+            table="users_in_public_rooms",
             keyvalues={"room_id": room_id},
             retcol="user_id",
             desc="get_users_in_public_due_to_room",
@@ -286,7 +286,7 @@ class UserDirectoryStore(SQLBaseStore):
         )
 
         user_ids_pub = yield self._simple_select_onecol(
-            table="users_in_pubic_room",
+            table="users_in_public_rooms",
             keyvalues={"room_id": room_id},
             retcol="user_id",
             desc="get_users_in_dir_due_to_room",
@@ -514,7 +514,7 @@ class UserDirectoryStore(SQLBaseStore):
         def _delete_all_from_user_dir_txn(txn):
             txn.execute("DELETE FROM user_directory")
             txn.execute("DELETE FROM user_directory_search")
-            txn.execute("DELETE FROM users_in_pubic_room")
+            txn.execute("DELETE FROM users_in_public_rooms")
             txn.execute("DELETE FROM users_who_share_rooms")
             txn.call_after(self.get_user_in_directory.invalidate_all)
             txn.call_after(self.get_user_in_public_room.invalidate_all)
@@ -537,7 +537,7 @@ class UserDirectoryStore(SQLBaseStore):
     @cached()
     def get_user_in_public_room(self, user_id):
         return self._simple_select_one(
-            table="users_in_pubic_room",
+            table="users_in_public_rooms",
             keyvalues={"user_id": user_id},
             retcols=("room_id",),
             allow_none=True,
@@ -641,7 +641,7 @@ class UserDirectoryStore(SQLBaseStore):
                 SELECT d.user_id, display_name, avatar_url
                 FROM user_directory_search
                 INNER JOIN user_directory AS d USING (user_id)
-                LEFT JOIN users_in_pubic_room AS p USING (user_id)
+                LEFT JOIN users_in_public_rooms AS p USING (user_id)
                 LEFT JOIN (
                     SELECT other_user_id AS user_id FROM users_who_share_rooms
                     WHERE user_id = ? AND share_private
@@ -680,7 +680,7 @@ class UserDirectoryStore(SQLBaseStore):
                 SELECT d.user_id, display_name, avatar_url
                 FROM user_directory_search
                 INNER JOIN user_directory AS d USING (user_id)
-                LEFT JOIN users_in_pubic_room AS p USING (user_id)
+                LEFT JOIN users_in_public_rooms AS p USING (user_id)
                 LEFT JOIN (
                     SELECT other_user_id AS user_id FROM users_who_share_rooms
                     WHERE user_id = ? AND share_private
diff --git a/synapse/util/async.py b/synapse/util/async.py
index 1a884e96e..e786fb38a 100644
--- a/synapse/util/async.py
+++ b/synapse/util/async.py
@@ -278,8 +278,13 @@ class Limiter(object):
         if entry[0] >= self.max_count:
             new_defer = defer.Deferred()
             entry[1].append(new_defer)
+
+            logger.info("Waiting to acquire limiter lock for key %r", key)
             with PreserveLoggingContext():
                 yield new_defer
+            logger.info("Acquired limiter lock for key %r", key)
+        else:
+            logger.info("Acquired uncontended limiter lock for key %r", key)
 
         entry[0] += 1
 
@@ -288,16 +293,21 @@ class Limiter(object):
             try:
                 yield
             finally:
+                logger.info("Releasing limiter lock for key %r", key)
+
                 # We've finished executing so check if there are any things
                 # blocked waiting to execute and start one of them
                 entry[0] -= 1
-                try:
-                    entry[1].pop(0).callback(None)
-                except IndexError:
-                    # If nothing else is executing for this key then remove it
-                    # from the map
-                    if entry[0] == 0:
-                        self.key_to_defer.pop(key, None)
+
+                if entry[1]:
+                    next_def = entry[1].pop(0)
+
+                    with PreserveLoggingContext():
+                        next_def.callback(None)
+                elif entry[0] == 0:
+                    # We were the last thing for this key: remove it from the
+                    # map.
+                    del self.key_to_defer[key]
 
         defer.returnValue(_ctx_manager())
 
diff --git a/tests/handlers/test_appservice.py b/tests/handlers/test_appservice.py
index 7fe88172c..a667fb6f0 100644
--- a/tests/handlers/test_appservice.py
+++ b/tests/handlers/test_appservice.py
@@ -53,7 +53,10 @@ class AppServiceHandlerTestCase(unittest.TestCase):
             type="m.room.message",
             room_id="!foo:bar"
         )
-        self.mock_store.get_new_events_for_appservice.return_value = (0, [event])
+        self.mock_store.get_new_events_for_appservice.side_effect = [
+            (0, [event]),
+            (0, [])
+        ]
         self.mock_as_api.push = Mock()
         yield self.handler.notify_interested_services(0)
         self.mock_scheduler.submit_event_for_as.assert_called_once_with(
@@ -75,7 +78,10 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         )
         self.mock_as_api.push = Mock()
         self.mock_as_api.query_user = Mock()
-        self.mock_store.get_new_events_for_appservice.return_value = (0, [event])
+        self.mock_store.get_new_events_for_appservice.side_effect = [
+            (0, [event]),
+            (0, [])
+        ]
         yield self.handler.notify_interested_services(0)
         self.mock_as_api.query_user.assert_called_once_with(
             services[0], user_id
@@ -98,7 +104,10 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         )
         self.mock_as_api.push = Mock()
         self.mock_as_api.query_user = Mock()
-        self.mock_store.get_new_events_for_appservice.return_value = (0, [event])
+        self.mock_store.get_new_events_for_appservice.side_effect = [
+            (0, [event]),
+            (0, [])
+        ]
         yield self.handler.notify_interested_services(0)
         self.assertFalse(
             self.mock_as_api.query_user.called,
diff --git a/tests/storage/test_appservice.py b/tests/storage/test_appservice.py
index 79f569e78..13d81f972 100644
--- a/tests/storage/test_appservice.py
+++ b/tests/storage/test_appservice.py
@@ -58,7 +58,7 @@ class ApplicationServiceStoreTestCase(unittest.TestCase):
         self._add_appservice("token2", "as2", "some_url", "some_hs_token", "bob")
         self._add_appservice("token3", "as3", "some_url", "some_hs_token", "bob")
         # must be done after inserts
-        self.store = ApplicationServiceStore(hs)
+        self.store = ApplicationServiceStore(None, hs)
 
     def tearDown(self):
         # TODO: suboptimal that we need to create files for tests!
@@ -150,7 +150,7 @@ class ApplicationServiceTransactionStoreTestCase(unittest.TestCase):
 
         self.as_yaml_files = []
 
-        self.store = TestTransactionStore(hs)
+        self.store = TestTransactionStore(None, hs)
 
     def _add_service(self, url, as_token, id):
         as_yaml = dict(url=url, as_token=as_token, hs_token="something",
@@ -420,8 +420,8 @@ class ApplicationServiceTransactionStoreTestCase(unittest.TestCase):
 class TestTransactionStore(ApplicationServiceTransactionStore,
                            ApplicationServiceStore):
 
-    def __init__(self, hs):
-        super(TestTransactionStore, self).__init__(hs)
+    def __init__(self, db_conn, hs):
+        super(TestTransactionStore, self).__init__(db_conn, hs)
 
 
 class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
@@ -458,7 +458,7 @@ class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
             replication_layer=Mock(),
         )
 
-        ApplicationServiceStore(hs)
+        ApplicationServiceStore(None, hs)
 
     @defer.inlineCallbacks
     def test_duplicate_ids(self):
@@ -477,7 +477,7 @@ class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
         )
 
         with self.assertRaises(ConfigError) as cm:
-            ApplicationServiceStore(hs)
+            ApplicationServiceStore(None, hs)
 
         e = cm.exception
         self.assertIn(f1, e.message)
@@ -501,7 +501,7 @@ class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
         )
 
         with self.assertRaises(ConfigError) as cm:
-            ApplicationServiceStore(hs)
+            ApplicationServiceStore(None, hs)
 
         e = cm.exception
         self.assertIn(f1, e.message)
diff --git a/tests/storage/test_base.py b/tests/storage/test_base.py
index 91e971190..0ac910e76 100644
--- a/tests/storage/test_base.py
+++ b/tests/storage/test_base.py
@@ -56,7 +56,7 @@ class SQLBaseStoreTestCase(unittest.TestCase):
             database_engine=create_engine(config.database_config),
         )
 
-        self.datastore = SQLBaseStore(hs)
+        self.datastore = SQLBaseStore(None, hs)
 
     @defer.inlineCallbacks
     def test_insert_1col(self):
diff --git a/tests/storage/test_directory.py b/tests/storage/test_directory.py
index b087892e0..95709cd50 100644
--- a/tests/storage/test_directory.py
+++ b/tests/storage/test_directory.py
@@ -29,7 +29,7 @@ class DirectoryStoreTestCase(unittest.TestCase):
     def setUp(self):
         hs = yield setup_test_homeserver()
 
-        self.store = DirectoryStore(hs)
+        self.store = DirectoryStore(None, hs)
 
         self.room = RoomID.from_string("!abcde:test")
         self.alias = RoomAlias.from_string("#my-room:test")
diff --git a/tests/storage/test_presence.py b/tests/storage/test_presence.py
index 63203cea3..f5fcb611d 100644
--- a/tests/storage/test_presence.py
+++ b/tests/storage/test_presence.py
@@ -29,7 +29,7 @@ class PresenceStoreTestCase(unittest.TestCase):
     def setUp(self):
         hs = yield setup_test_homeserver(clock=MockClock())
 
-        self.store = PresenceStore(hs)
+        self.store = PresenceStore(None, hs)
 
         self.u_apple = UserID.from_string("@apple:test")
         self.u_banana = UserID.from_string("@banana:test")
diff --git a/tests/storage/test_profile.py b/tests/storage/test_profile.py
index 24118bbc8..423710c9c 100644
--- a/tests/storage/test_profile.py
+++ b/tests/storage/test_profile.py
@@ -29,7 +29,7 @@ class ProfileStoreTestCase(unittest.TestCase):
     def setUp(self):
         hs = yield setup_test_homeserver()
 
-        self.store = ProfileStore(hs)
+        self.store = ProfileStore(None, hs)
 
         self.u_frank = UserID.from_string("@frank:test")
 
diff --git a/tests/storage/test_registration.py b/tests/storage/test_registration.py
index 316ecdb32..7c7b164ee 100644
--- a/tests/storage/test_registration.py
+++ b/tests/storage/test_registration.py
@@ -86,7 +86,8 @@ class RegistrationStoreTestCase(unittest.TestCase):
 
         # now delete some
         yield self.store.user_delete_access_tokens(
-            self.user_id, device_id=self.device_id, delete_refresh_tokens=True)
+            self.user_id, device_id=self.device_id,
+        )
 
         # check they were deleted
         user = yield self.store.get_user_by_access_token(self.tokens[1])
@@ -97,8 +98,7 @@ class RegistrationStoreTestCase(unittest.TestCase):
         self.assertEqual(self.user_id, user["name"])
 
         # now delete the rest
-        yield self.store.user_delete_access_tokens(
-            self.user_id, delete_refresh_tokens=True)
+        yield self.store.user_delete_access_tokens(self.user_id)
 
         user = yield self.store.get_user_by_access_token(self.tokens[0])
         self.assertIsNone(user,
diff --git a/tests/utils.py b/tests/utils.py
index d2ebce4b2..ed8a7360f 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -310,6 +310,7 @@ class SQLiteMemoryDbPool(ConnectionPool, object):
         )
 
         self.config = Mock()
+        self.config.password_providers = []
         self.config.database_config = {"name": "sqlite3"}
 
     def prepare(self):