Feature: Add deactivate account admin API

Allows server admins to "deactivate" accounts, which:

- Revokes all access tokens
- Removes all threepids
- Removes password

The API is a POST to `/admin/deactivate/<user_id>`

synapse/rest/client/v1/admin.py

@@ -77,6 +77,32 @@ class PurgeMediaCacheRestServlet(ClientV1RestServlet):
         defer.returnValue((200, ret))
 
 
+class DeactivateAccountRestServlet(ClientV1RestServlet):
+    PATTERNS = client_path_patterns("/admin/deactivate/(?P<target_user_id>[^/]*)")
+
+    def __init__(self, hs):
+        self.store = hs.get_datastore()
+        super(DeactivateAccountRestServlet, self).__init__(hs)
+
+    @defer.inlineCallbacks
+    def on_POST(self, request, target_user_id):
+        UserID.from_string(target_user_id)
+        requester = yield self.auth.get_user_by_req(request)
+        is_admin = yield self.auth.is_server_admin(requester.user)
+
+        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)
+
+        defer.returnValue((200, {}))
+
+
 def register_servlets(hs, http_server):
     WhoisRestServlet(hs).register(http_server)
     PurgeMediaCacheRestServlet(hs).register(http_server)
+    DeactivateAccountRestServlet(hs).register(http_server)

synapse/storage/_base.py

@@ -807,6 +807,11 @@ class SQLBaseStore(object):
         if txn.rowcount > 1:
             raise StoreError(500, "more than one row matched")
 
+    def _simple_delete(self, table, keyvalues, desc):
+        return self.runInteraction(
+            desc, self._simple_delete_txn, table, keyvalues
+        )
+
     @staticmethod
     def _simple_delete_txn(txn, table, keyvalues):
         sql = "DELETE FROM %s WHERE %s" % (

synapse/storage/registration.py

@@ -384,6 +384,15 @@ class RegistrationStore(SQLBaseStore):
             defer.returnValue(ret['user_id'])
         defer.returnValue(None)
 
+    def user_delete_threepids(self, user_id):
+        return self._simple_delete(
+            "user_threepids",
+            keyvalues={
+                "user_id": user_id,
+            },
+            desc="user_delete_threepids",
+        )
+
     @defer.inlineCallbacks
     def count_all_users(self):
         """Counts all users registered on the homeserver."""