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Replace username picker with a template (#9275)

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There's some prelimiary work here to pull out the construction of a jinja environment to a separate function.

I wanted to load the template at display time rather than load time, so that it's easy to update on the fly. Honestly, I think we should do this with all our templates: the risk of ending up with malformed templates is far outweighed by the improved turnaround time for an admin trying to update them.
This commit is contained in:
Richard van der Hoff 2021-02-01 15:52:50 +00:00 committed by GitHub
parent 8aed29dc61
commit 4167494c90
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15 changed files with 429 additions and 204 deletions
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1
changelog.d/9275.feature Normal file
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@ -0,0 +1 @@
Improve the user experience of setting up an account via single-sign on.

32
docs/sample_config.yaml
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@ -1801,7 +1801,8 @@ saml2_config:
#
# localpart_template: Jinja2 template for the localpart of the MXID.
# If this is not set, the user will be prompted to choose their
# own username.
# own username (see 'sso_auth_account_details.html' in the 'sso'
# section of this file).
#
# display_name_template: Jinja2 template for the display name to set
# on first login. If unset, no displayname will be set.
@ -1968,6 +1969,35 @@ sso:
#
# * idp: the 'idp_id' of the chosen IDP.
#
# * HTML page to prompt new users to enter a userid and confirm other
# details: 'sso_auth_account_details.html'. This is only shown if the
# SSO implementation (with any user_mapping_provider) does not return
# a localpart.
#
# When rendering, this template is given the following variables:
#
# * server_name: the homeserver's name.
#
# * idp: details of the SSO Identity Provider that the user logged in
# with: an object with the following attributes:
#
# * idp_id: unique identifier for the IdP
# * idp_name: user-facing name for the IdP
# * idp_icon: if specified in the IdP config, an MXC URI for an icon
# for the IdP
# * idp_brand: if specified in the IdP config, a textual identifier
# for the brand of the IdP
#
# * user_attributes: an object containing details about the user that
# we received from the IdP. May have the following attributes:
#
# * display_name: the user's display_name
# * emails: a list of email addresses
#
# The template should render a form which submits the following fields:
#
# * username: the localpart of the user's chosen user id
#
# * HTML page for a confirmation step before redirecting back to the client
# with the login token: 'sso_redirect_confirm.html'.
#

39
synapse/config/_base.py
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@ -18,18 +18,18 @@
import argparse
import errno
import os
import time
import urllib.parse
from collections import OrderedDict
from hashlib import sha256
from textwrap import dedent
from typing import Any, Callable, Iterable, List, MutableMapping, Optional
from typing import Any, Iterable, List, MutableMapping, Optional
import attr
import jinja2
import pkg_resources
import yaml
from synapse.util.templates import _create_mxc_to_http_filter, _format_ts_filter
class ConfigError(Exception):
"""Represents a problem parsing the configuration
@ -248,6 +248,7 @@ class Config:
# Search the custom template directory as well
search_directories.insert(0, custom_template_directory)
# TODO: switch to synapse.util.templates.build_jinja_env
loader = jinja2.FileSystemLoader(search_directories)
env = jinja2.Environment(loader=loader, autoescape=autoescape)
@ -267,38 +268,6 @@ class Config:
return templates
def _format_ts_filter(value: int, format: str):
return time.strftime(format, time.localtime(value / 1000))
def _create_mxc_to_http_filter(public_baseurl: str) -> Callable:
"""Create and return a jinja2 filter that converts MXC urls to HTTP
Args:
public_baseurl: The public, accessible base URL of the homeserver
"""
def mxc_to_http_filter(value, width, height, resize_method="crop"):
if value[0:6] != "mxc://":
return ""
server_and_media_id = value[6:]
fragment = None
if "#" in server_and_media_id:
server_and_media_id, fragment = server_and_media_id.split("#", 1)
fragment = "#" + fragment
params = {"width": width, "height": height, "method": resize_method}
return "%s_matrix/media/v1/thumbnail/%s?%s%s" % (
public_baseurl,
server_and_media_id,
urllib.parse.urlencode(params),
fragment or "",
)
return mxc_to_http_filter
class RootConfig:
"""
Holder of an application's configuration.

3
synapse/config/oidc_config.py
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@ -152,7 +152,8 @@ class OIDCConfig(Config):
#
# localpart_template: Jinja2 template for the localpart of the MXID.
# If this is not set, the user will be prompted to choose their
# own username.
# own username (see 'sso_auth_account_details.html' in the 'sso'
# section of this file).
#
# display_name_template: Jinja2 template for the display name to set
# on first login. If unset, no displayname will be set.

33
synapse/config/sso.py
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@ -27,7 +27,7 @@ class SSOConfig(Config):
sso_config = config.get("sso") or {} # type: Dict[str, Any]
# The sso-specific template_dir
template_dir = sso_config.get("template_dir")
self.sso_template_dir = sso_config.get("template_dir")
# Read templates from disk
(
@ -48,7 +48,7 @@ class SSOConfig(Config):
"sso_auth_success.html",
"sso_auth_bad_user.html",
],
template_dir,
self.sso_template_dir,
)
# These templates have no placeholders, so render them here
@ -124,6 +124,35 @@ class SSOConfig(Config):
#
# * idp: the 'idp_id' of the chosen IDP.
#
# * HTML page to prompt new users to enter a userid and confirm other
# details: 'sso_auth_account_details.html'. This is only shown if the
# SSO implementation (with any user_mapping_provider) does not return
# a localpart.
#
# When rendering, this template is given the following variables:
#
# * server_name: the homeserver's name.
#
# * idp: details of the SSO Identity Provider that the user logged in
# with: an object with the following attributes:
#
# * idp_id: unique identifier for the IdP
# * idp_name: user-facing name for the IdP
# * idp_icon: if specified in the IdP config, an MXC URI for an icon
# for the IdP
# * idp_brand: if specified in the IdP config, a textual identifier
# for the brand of the IdP
#
# * user_attributes: an object containing details about the user that
# we received from the IdP. May have the following attributes:
#
# * display_name: the user's display_name
# * emails: a list of email addresses
#
# The template should render a form which submits the following fields:
#
# * username: the localpart of the user's chosen user id
#
# * HTML page for a confirmation step before redirecting back to the client
# with the login token: 'sso_redirect_confirm.html'.
#

2
synapse/handlers/sso.py
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@ -530,7 +530,7 @@ class SsoHandler:
logger.info("Recorded registration session id %s", session_id)
# Set the cookie and redirect to the username picker
e = RedirectException(b"/_synapse/client/pick_username")
e = RedirectException(b"/_synapse/client/pick_username/account_details")
e.cookies.append(
b"%s=%s; path=/"
% (USERNAME_MAPPING_SESSION_COOKIE_NAME, session_id.encode("ascii"))

115
synapse/res/templates/sso_auth_account_details.html Normal file
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@ -0,0 +1,115 @@
<!DOCTYPE html>
<html lang="en">
<head>
<title>Synapse Login</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no">
<style type="text/css">
{% include "sso.css" without context %}
.username_input {
display: flex;
border: 2px solid #418DED;
border-radius: 8px;
padding: 12px;
position: relative;
margin: 16px 0;
align-items: center;
font-size: 12px;
}
.username_input label {
position: absolute;
top: -8px;
left: 14px;
font-size: 80%;
background: white;
padding: 2px;
}
.username_input input {
flex: 1;
display: block;
min-width: 0;
border: none;
}
.username_input div {
color: #8D99A5;
}
.idp-pick-details {
border: 1px solid #E9ECF1;
border-radius: 8px;
margin: 24px 0;
}
.idp-pick-details h2 {
margin: 0;
padding: 8px 12px;
}
.idp-pick-details .idp-detail {
border-top: 1px solid #E9ECF1;
padding: 12px;
}
.idp-pick-details .use, .idp-pick-details .idp-value {
color: #737D8C;
}
.idp-pick-details .idp-value {
margin: 0;
margin-top: 8px;
}
.idp-pick-details .avatar {
width: 53px;
height: 53px;
border-radius: 100%;
display: block;
margin-top: 8px;
}
</style>
</head>
<body>
<header>
<h1>Your account is nearly ready</h1>
<p>Check your details before creating an account on {{ server_name }}</p>
</header>
<main>
<form method="post" class="form__input" id="form">
<div class="username_input">
<label for="field-username">Username</label>
<div class="prefix">@</div>
<input type="text" name="username" id="field-username" autofocus required pattern="[a-z0-9\-=_\/\.]+">
<div class="postfix">:{{ server_name }}</div>
</div>
<input type="submit" value="Continue" class="primary-button">
{% if user_attributes %}
<section class="idp-pick-details">
<h2><img src="{{ idp.idp_icon | mxc_to_http(24, 24) }}"/>Information from {{ idp.idp_name }}</h2>
{% if user_attributes.avatar_url %}
<div class="idp-detail idp-avatar">
<img src="{{ user_attributes.avatar_url }}" class="avatar" />
</div>
{% endif %}
{% if user_attributes.display_name %}
<div class="idp-detail">
<p class="idp-value">{{ user_attributes.display_name }}</p>
</div>
{% endif %}
{% for email in user_attributes.emails %}
<div class="idp-detail">
<p class="idp-value">{{ email }}</p>
</div>
{% endfor %}
</section>
{% endif %}
</form>
</main>
<script type="text/javascript">
{% include "sso_auth_account_details.js" without context %}
</script>
</body>
</html>

76
synapse/res/templates/sso_auth_account_details.js Normal file
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@ -0,0 +1,76 @@
const usernameField = document.getElementById("field-username");
function throttle(fn, wait) {
let timeout;
return function() {
const args = Array.from(arguments);
if (timeout) {
clearTimeout(timeout);
}
timeout = setTimeout(fn.bind.apply(fn, [null].concat(args)), wait);
}
}
function checkUsernameAvailable(username) {
let check_uri = 'check?username=' + encodeURIComponent(username);
return fetch(check_uri, {
// include the cookie
"credentials": "same-origin",
}).then((response) => {
if(!response.ok) {
// for non-200 responses, raise the body of the response as an exception
return response.text().then((text) => { throw new Error(text); });
} else {
return response.json();
}
}).then((json) => {
if(json.error) {
return {message: json.error};
} else if(json.available) {
return {available: true};
} else {
return {message: username + " is not available, please choose another."};
}
});
}
function validateUsername(username) {
usernameField.setCustomValidity("");
if (usernameField.validity.valueMissing) {
usernameField.setCustomValidity("Please provide a username");
return;
}
if (usernameField.validity.patternMismatch) {
usernameField.setCustomValidity("Invalid username, please only use " + allowedCharactersString);
return;
}
usernameField.setCustomValidity("Checking if username is available …");
throttledCheckUsernameAvailable(username);
}
const throttledCheckUsernameAvailable = throttle(function(username) {
const handleError = function(err) {
// don't prevent form submission on error
usernameField.setCustomValidity("");
console.log(err.message);
};
try {
checkUsernameAvailable(username).then(function(result) {
if (!result.available) {
usernameField.setCustomValidity(result.message);
usernameField.reportValidity();
} else {
usernameField.setCustomValidity("");
}
}, handleError);
} catch (err) {
handleError(err);
}
}, 500);
usernameField.addEventListener("input", function(evt) {
validateUsername(usernameField.value);
});
usernameField.addEventListener("change", function(evt) {
validateUsername(usernameField.value);
});

19
synapse/res/username_picker/index.html
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@ -1,19 +0,0 @@
<!DOCTYPE html>
<html lang="en">
<head>
<title>Synapse Login</title>
<link rel="stylesheet" href="style.css" type="text/css" />
</head>
<body>
<div class="card">
<form method="post" class="form__input" id="form" action="submit">
<label for="field-username">Please pick your username:</label>
<input type="text" name="username" id="field-username" autofocus="">
<input type="submit" class="button button--full-width" id="button-submit" value="Submit">
</form>
<!-- this is used for feedback -->
<div role=alert class="tooltip hidden" id="message"></div>
<script src="script.js"></script>
</div>
</body>
</html>

95
synapse/res/username_picker/script.js
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@ -1,95 +0,0 @@
let inputField = document.getElementById("field-username");
let inputForm = document.getElementById("form");
let submitButton = document.getElementById("button-submit");
let message = document.getElementById("message");
// Submit username and receive response
function showMessage(messageText) {
// Unhide the message text
message.classList.remove("hidden");
message.textContent = messageText;
};
function doSubmit() {
showMessage("Success. Please wait a moment for your browser to redirect.");
// remove the event handler before re-submitting the form.
delete inputForm.onsubmit;
inputForm.submit();
}
function onResponse(response) {
// Display message
showMessage(response);
// Enable submit button and input field
submitButton.classList.remove('button--disabled');
submitButton.value = "Submit";
};
let allowedUsernameCharacters = RegExp("[^a-z0-9\\.\\_\\=\\-\\/]");
function usernameIsValid(username) {
return !allowedUsernameCharacters.test(username);
}
let allowedCharactersString = "lowercase letters, digits, ., _, -, /, =";
function buildQueryString(params) {
return Object.keys(params)
.map(k => encodeURIComponent(k) + '=' + encodeURIComponent(params[k]))
.join('&');
}
function submitUsername(username) {
if(username.length == 0) {
onResponse("Please enter a username.");
return;
}
if(!usernameIsValid(username)) {
onResponse("Invalid username. Only the following characters are allowed: " + allowedCharactersString);
return;
}
// if this browser doesn't support fetch, skip the availability check.
if(!window.fetch) {
doSubmit();
return;
}
let check_uri = 'check?' + buildQueryString({"username": username});
fetch(check_uri, {
// include the cookie
"credentials": "same-origin",
}).then((response) => {
if(!response.ok) {
// for non-200 responses, raise the body of the response as an exception
return response.text().then((text) => { throw text; });
} else {
return response.json();
}
}).then((json) => {
if(json.error) {
throw json.error;
} else if(json.available) {
doSubmit();
} else {
onResponse("This username is not available, please choose another.");
}
}).catch((err) => {
onResponse("Error checking username availability: " + err);
});
}
function clickSubmit() {
event.preventDefault();
if(submitButton.classList.contains('button--disabled')) { return; }
// Disable submit button and input field
submitButton.classList.add('button--disabled');
// Submit username
submitButton.value = "Checking...";
submitUsername(inputField.value);
};
inputForm.onsubmit = clickSubmit;

27
synapse/res/username_picker/style.css
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@ -1,27 +0,0 @@
input[type="text"] {
font-size: 100%;
background-color: #ededf0;
border: 1px solid #fff;
border-radius: .2em;
padding: .5em .9em;
display: block;
width: 26em;
}
.button--disabled {
border-color: #fff;
background-color: transparent;
color: #000;
text-transform: none;
}
.hidden {
display: none;
}
.tooltip {
background-color: #f9f9fa;
padding: 1em;
margin: 1em 0;
}

1
synapse/rest/consent/consent_resource.py
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@ -100,6 +100,7 @@ class ConsentResource(DirectServeHtmlResource):
consent_template_directory = hs.config.user_consent_template_dir
# TODO: switch to synapse.util.templates.build_jinja_env
loader = jinja2.FileSystemLoader(consent_template_directory)
self._jinja_env = jinja2.Environment(
loader=loader, autoescape=jinja2.select_autoescape(["html", "htm", "xml"])

79
synapse/rest/synapse/client/pick_username.py
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@ -13,41 +13,41 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import TYPE_CHECKING
import pkg_resources
from twisted.web.http import Request
from twisted.web.resource import Resource
from twisted.web.static import File
from synapse.api.errors import SynapseError
from synapse.handlers.sso import get_username_mapping_session_cookie_from_request
from synapse.http.server import DirectServeHtmlResource, DirectServeJsonResource
from synapse.http.server import (
DirectServeHtmlResource,
DirectServeJsonResource,
respond_with_html,
)
from synapse.http.servlet import parse_string
from synapse.http.site import SynapseRequest
from synapse.util.templates import build_jinja_env
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
def pick_username_resource(hs: "HomeServer") -> Resource:
"""Factory method to generate the username picker resource.
This resource gets mounted under /_synapse/client/pick_username. The top-level
resource is just a File resource which serves up the static files in the resources
"res" directory, but it has a couple of children:
This resource gets mounted under /_synapse/client/pick_username and has two
children:
* "submit", which does the mechanics of registering the new user, and redirects the
browser back to the client URL
* "check": checks if a userid is free.
* "account_details": renders the form and handles the POSTed response
* "check": a JSON endpoint which checks if a userid is free.
"""
# XXX should we make this path customisable so that admins can restyle it?
base_path = pkg_resources.resource_filename("synapse", "res/username_picker")
res = File(base_path)
res.putChild(b"submit", SubmitResource(hs))
res = Resource()
res.putChild(b"account_details", AccountDetailsResource(hs))
res.putChild(b"check", AvailabilityCheckResource(hs))
return res
@ -69,15 +69,54 @@ class AvailabilityCheckResource(DirectServeJsonResource):
return 200, {"available": is_available}
class SubmitResource(DirectServeHtmlResource):
class AccountDetailsResource(DirectServeHtmlResource):
def __init__(self, hs: "HomeServer"):
super().__init__()
self._sso_handler = hs.get_sso_handler()
async def _async_render_POST(self, request: SynapseRequest):
localpart = parse_string(request, "username", required=True)
def template_search_dirs():
if hs.config.sso.sso_template_dir:
yield hs.config.sso.sso_template_dir
yield hs.config.sso.default_template_dir
session_id = get_username_mapping_session_cookie_from_request(request)
self._jinja_env = build_jinja_env(template_search_dirs(), hs.config)
async def _async_render_GET(self, request: Request) -> None:
try:
session_id = get_username_mapping_session_cookie_from_request(request)
session = self._sso_handler.get_mapping_session(session_id)
except SynapseError as e:
logger.warning("Error fetching session: %s", e)
self._sso_handler.render_error(request, "bad_session", e.msg, code=e.code)
return
idp_id = session.auth_provider_id
template_params = {
"idp": self._sso_handler.get_identity_providers()[idp_id],
"user_attributes": {
"display_name": session.display_name,
"emails": session.emails,
},
}
template = self._jinja_env.get_template("sso_auth_account_details.html")
html = template.render(template_params)
respond_with_html(request, 200, html)
async def _async_render_POST(self, request: SynapseRequest):
try:
session_id = get_username_mapping_session_cookie_from_request(request)
except SynapseError as e:
logger.warning("Error fetching session cookie: %s", e)
self._sso_handler.render_error(request, "bad_session", e.msg, code=e.code)
return
try:
localpart = parse_string(request, "username", required=True)
except SynapseError as e:
logger.warning("[session %s] bad param: %s", session_id, e)
self._sso_handler.render_error(request, "bad_param", e.msg, code=e.code)
return
await self._sso_handler.handle_submit_username_request(
request, localpart, session_id

106
synapse/util/templates.py Normal file
View File

@ -0,0 +1,106 @@
# -*- coding: utf-8 -*-
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# 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.
"""Utilities for dealing with jinja2 templates"""
import time
import urllib.parse
from typing import TYPE_CHECKING, Callable, Iterable, Union
import jinja2
if TYPE_CHECKING:
from synapse.config.homeserver import HomeServerConfig
def build_jinja_env(
template_search_directories: Iterable[str],
config: "HomeServerConfig",
autoescape: Union[bool, Callable[[str], bool], None] = None,
) -> jinja2.Environment:
"""Set up a Jinja2 environment to load templates from the given search path
The returned environment defines the following filters:
- format_ts: formats timestamps as strings in the server's local timezone
(XXX: why is that useful??)
- mxc_to_http: converts mxc: uris to http URIs. Args are:
(uri, width, height, resize_method="crop")
and the following global variables:
- server_name: matrix server name
Args:
template_search_directories: directories to search for templates
config: homeserver config, for things like `server_name` and `public_baseurl`
autoescape: whether template variables should be autoescaped. bool, or
a function mapping from template name to bool. Defaults to escaping templates
whose names end in .html, .xml or .htm.
Returns:
jinja environment
"""
if autoescape is None:
autoescape = jinja2.select_autoescape()
loader = jinja2.FileSystemLoader(template_search_directories)
env = jinja2.Environment(loader=loader, autoescape=autoescape)
# Update the environment with our custom filters
env.filters.update(
{
"format_ts": _format_ts_filter,
"mxc_to_http": _create_mxc_to_http_filter(config.public_baseurl),
}
)
# common variables for all templates
env.globals.update({"server_name": config.server_name})
return env
def _create_mxc_to_http_filter(public_baseurl: str) -> Callable:
"""Create and return a jinja2 filter that converts MXC urls to HTTP
Args:
public_baseurl: The public, accessible base URL of the homeserver
"""
def mxc_to_http_filter(value, width, height, resize_method="crop"):
if value[0:6] != "mxc://":
return ""
server_and_media_id = value[6:]
fragment = None
if "#" in server_and_media_id:
server_and_media_id, fragment = server_and_media_id.split("#", 1)
fragment = "#" + fragment
params = {"width": width, "height": height, "method": resize_method}
return "%s_matrix/media/v1/thumbnail/%s?%s%s" % (
public_baseurl,
server_and_media_id,
urllib.parse.urlencode(params),
fragment or "",
)
return mxc_to_http_filter
def _format_ts_filter(value: int, format: str):
return time.strftime(format, time.localtime(value / 1000))

5
tests/rest/client/v1/test_login.py
View File

@ -1222,7 +1222,7 @@ class UsernamePickerTestCase(HomeserverTestCase):
# that should redirect to the username picker
self.assertEqual(channel.code, 302, channel.result)
picker_url = channel.headers.getRawHeaders("Location")[0]
self.assertEqual(picker_url, "/_synapse/client/pick_username")
self.assertEqual(picker_url, "/_synapse/client/pick_username/account_details")
# ... with a username_mapping_session cookie
cookies = {} # type: Dict[str,str]
@ -1247,11 +1247,10 @@ class UsernamePickerTestCase(HomeserverTestCase):
# Now, submit a username to the username picker, which should serve a redirect
# to the completion page
submit_path = picker_url + "/submit"
content = urlencode({b"username": b"bobby"}).encode("utf8")
chan = self.make_request(
"POST",
path=submit_path,
path=picker_url,
content=content,
content_is_form=True,
custom_headers=[