Merge branch 'release-v0.17.0' of github.com:matrix-org/synapse v0.17.0

17 files changed, 829 insertions, 365 deletions

diff --git a/synapse/rest/__init__.py b/synapse/rest/__init__.py
index 8b223e032b..14227f1cdb 100644
--- a/synapse/rest/__init__.py
+++ b/synapse/rest/__init__.py
@@ -46,6 +46,7 @@ from synapse.rest.client.v2_alpha import (
     account_data,
     report_event,
     openid,
+    devices,
 )
 
 from synapse.http.server import JsonResource
@@ -90,3 +91,4 @@ class ClientRestResource(JsonResource):
         account_data.register_servlets(hs, client_resource)
         report_event.register_servlets(hs, client_resource)
         openid.register_servlets(hs, client_resource)
+        devices.register_servlets(hs, client_resource)
diff --git a/synapse/rest/client/v1/admin.py b/synapse/rest/client/v1/admin.py
index aa05b3f023..b0cb31a448 100644
--- a/synapse/rest/client/v1/admin.py
+++ b/synapse/rest/client/v1/admin.py
@@ -46,5 +46,82 @@ class WhoisRestServlet(ClientV1RestServlet):
         defer.returnValue((200, ret))
 
 
+class PurgeMediaCacheRestServlet(ClientV1RestServlet):
+    PATTERNS = client_path_patterns("/admin/purge_media_cache")
+
+    def __init__(self, hs):
+        self.media_repository = hs.get_media_repository()
+        super(PurgeMediaCacheRestServlet, self).__init__(hs)
+
+    @defer.inlineCallbacks
+    def on_POST(self, request):
+        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")
+
+        before_ts = request.args.get("before_ts", None)
+        if not before_ts:
+            raise SynapseError(400, "Missing 'before_ts' arg")
+
+        logger.info("before_ts: %r", before_ts[0])
+
+        try:
+            before_ts = int(before_ts[0])
+        except Exception:
+            raise SynapseError(400, "Invalid 'before_ts' arg")
+
+        ret = yield self.media_repository.delete_old_remote_media(before_ts)
+
+        defer.returnValue((200, ret))
+
+
+class PurgeHistoryRestServlet(ClientV1RestServlet):
+    PATTERNS = client_path_patterns(
+        "/admin/purge_history/(?P<room_id>[^/]*)/(?P<event_id>[^/]*)"
+    )
+
+    @defer.inlineCallbacks
+    def on_POST(self, request, room_id, event_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")
+
+        yield self.handlers.message_handler.purge_history(room_id, event_id)
+
+        defer.returnValue((200, {}))
+
+
+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)
+    PurgeHistoryRestServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v1/base.py b/synapse/rest/client/v1/base.py
index 1c020b7e2c..96b49b01f2 100644
--- a/synapse/rest/client/v1/base.py
+++ b/synapse/rest/client/v1/base.py
@@ -52,6 +52,10 @@ class ClientV1RestServlet(RestServlet):
     """
 
     def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer):
+        """
         self.hs = hs
         self.handlers = hs.get_handlers()
         self.builder_factory = hs.get_event_builder_factory()
diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py
index 8df9d10efa..92fcae674a 100644
--- a/synapse/rest/client/v1/login.py
+++ b/synapse/rest/client/v1/login.py
@@ -59,6 +59,7 @@ class LoginRestServlet(ClientV1RestServlet):
         self.servername = hs.config.server_name
         self.http_client = hs.get_simple_http_client()
         self.auth_handler = self.hs.get_auth_handler()
+        self.device_handler = self.hs.get_device_handler()
 
     def on_GET(self, request):
         flows = []
@@ -145,15 +146,23 @@ class LoginRestServlet(ClientV1RestServlet):
             ).to_string()
 
         auth_handler = self.auth_handler
-        user_id, access_token, refresh_token = yield auth_handler.login_with_password(
+        user_id = yield auth_handler.validate_password_login(
             user_id=user_id,
-            password=login_submission["password"])
-
+            password=login_submission["password"],
+        )
+        device_id = yield self._register_device(user_id, login_submission)
+        access_token, refresh_token = (
+            yield auth_handler.get_login_tuple_for_user_id(
+                user_id, device_id,
+                login_submission.get("initial_device_display_name")
+            )
+        )
         result = {
             "user_id": user_id,  # may have changed
             "access_token": access_token,
             "refresh_token": refresh_token,
             "home_server": self.hs.hostname,
+            "device_id": device_id,
         }
 
         defer.returnValue((200, result))
@@ -165,14 +174,19 @@ class LoginRestServlet(ClientV1RestServlet):
         user_id = (
             yield auth_handler.validate_short_term_login_token_and_get_user_id(token)
         )
-        user_id, access_token, refresh_token = (
-            yield auth_handler.get_login_tuple_for_user_id(user_id)
+        device_id = yield self._register_device(user_id, login_submission)
+        access_token, refresh_token = (
+            yield auth_handler.get_login_tuple_for_user_id(
+                user_id, device_id,
+                login_submission.get("initial_device_display_name")
+            )
         )
         result = {
             "user_id": user_id,  # may have changed
             "access_token": access_token,
             "refresh_token": refresh_token,
             "home_server": self.hs.hostname,
+            "device_id": device_id,
         }
 
         defer.returnValue((200, result))
@@ -196,13 +210,15 @@ class LoginRestServlet(ClientV1RestServlet):
 
         user_id = UserID.create(user, self.hs.hostname).to_string()
         auth_handler = self.auth_handler
-        user_exists = yield auth_handler.does_user_exist(user_id)
-        if user_exists:
-            user_id, access_token, refresh_token = (
-                yield auth_handler.get_login_tuple_for_user_id(user_id)
+        registered_user_id = yield auth_handler.check_user_exists(user_id)
+        if registered_user_id:
+            access_token, refresh_token = (
+                yield auth_handler.get_login_tuple_for_user_id(
+                    registered_user_id
+                )
             )
             result = {
-                "user_id": user_id,  # may have changed
+                "user_id": registered_user_id,  # may have changed
                 "access_token": access_token,
                 "refresh_token": refresh_token,
                 "home_server": self.hs.hostname,
@@ -245,18 +261,27 @@ class LoginRestServlet(ClientV1RestServlet):
 
         user_id = UserID.create(user, self.hs.hostname).to_string()
         auth_handler = self.auth_handler
-        user_exists = yield auth_handler.does_user_exist(user_id)
-        if user_exists:
-            user_id, access_token, refresh_token = (
-                yield auth_handler.get_login_tuple_for_user_id(user_id)
+        registered_user_id = yield auth_handler.check_user_exists(user_id)
+        if registered_user_id:
+            device_id = yield self._register_device(
+                registered_user_id, login_submission
+            )
+            access_token, refresh_token = (
+                yield auth_handler.get_login_tuple_for_user_id(
+                    registered_user_id, device_id,
+                    login_submission.get("initial_device_display_name")
+                )
             )
             result = {
-                "user_id": user_id,  # may have changed
+                "user_id": registered_user_id,
                 "access_token": access_token,
                 "refresh_token": refresh_token,
                 "home_server": self.hs.hostname,
             }
         else:
+            # TODO: we should probably check that the register isn't going
+            # to fonx/change our user_id before registering the device
+            device_id = yield self._register_device(user_id, login_submission)
             user_id, access_token = (
                 yield self.handlers.registration_handler.register(localpart=user)
             )
@@ -295,6 +320,26 @@ class LoginRestServlet(ClientV1RestServlet):
 
         return (user, attributes)
 
+    def _register_device(self, user_id, login_submission):
+        """Register a device for a user.
+
+        This is called after the user's credentials have been validated, but
+        before the access token has been issued.
+
+        Args:
+            (str) user_id: full canonical @user:id
+            (object) login_submission: dictionary supplied to /login call, from
+               which we pull device_id and initial_device_name
+        Returns:
+            defer.Deferred: (str) device_id
+        """
+        device_id = login_submission.get("device_id")
+        initial_display_name = login_submission.get(
+            "initial_device_display_name")
+        return self.device_handler.check_device_registered(
+            user_id, device_id, initial_display_name
+        )
+
 
 class SAML2RestServlet(ClientV1RestServlet):
     PATTERNS = client_path_patterns("/login/saml2", releases=())
@@ -414,13 +459,13 @@ class CasTicketServlet(ClientV1RestServlet):
 
         user_id = UserID.create(user, self.hs.hostname).to_string()
         auth_handler = self.auth_handler
-        user_exists = yield auth_handler.does_user_exist(user_id)
-        if not user_exists:
-            user_id, _ = (
+        registered_user_id = yield auth_handler.check_user_exists(user_id)
+        if not registered_user_id:
+            registered_user_id, _ = (
                 yield self.handlers.registration_handler.register(localpart=user)
             )
 
-        login_token = auth_handler.generate_short_term_login_token(user_id)
+        login_token = auth_handler.generate_short_term_login_token(registered_user_id)
         redirect_url = self.add_login_token_to_redirect_url(client_redirect_url,
                                                             login_token)
         request.redirect(redirect_url)
diff --git a/synapse/rest/client/v1/register.py b/synapse/rest/client/v1/register.py
index e3f4fbb0bb..2383b9df86 100644
--- a/synapse/rest/client/v1/register.py
+++ b/synapse/rest/client/v1/register.py
@@ -52,6 +52,10 @@ class RegisterRestServlet(ClientV1RestServlet):
     PATTERNS = client_path_patterns("/register$", releases=(), include_in_unstable=False)
 
     def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
         super(RegisterRestServlet, self).__init__(hs)
         # sessions are stored as:
         # self.sessions = {
@@ -60,6 +64,7 @@ class RegisterRestServlet(ClientV1RestServlet):
         # TODO: persistent storage
         self.sessions = {}
         self.enable_registration = hs.config.enable_registration
+        self.auth_handler = hs.get_auth_handler()
 
     def on_GET(self, request):
         if self.hs.config.enable_registration_captcha:
@@ -299,9 +304,10 @@ class RegisterRestServlet(ClientV1RestServlet):
         user_localpart = register_json["user"].encode("utf-8")
 
         handler = self.handlers.registration_handler
-        (user_id, token) = yield handler.appservice_register(
+        user_id = yield handler.appservice_register(
             user_localpart, as_token
         )
+        token = yield self.auth_handler.issue_access_token(user_id)
         self._remove_session(session)
         defer.returnValue({
             "user_id": user_id,
@@ -324,6 +330,14 @@ class RegisterRestServlet(ClientV1RestServlet):
             raise SynapseError(400, "Shared secret registration is not enabled")
 
         user = register_json["user"].encode("utf-8")
+        password = register_json["password"].encode("utf-8")
+        admin = register_json.get("admin", None)
+
+        # Its important to check as we use null bytes as HMAC field separators
+        if "\x00" in user:
+            raise SynapseError(400, "Invalid user")
+        if "\x00" in password:
+            raise SynapseError(400, "Invalid password")
 
         # str() because otherwise hmac complains that 'unicode' does not
         # have the buffer interface
@@ -331,17 +345,21 @@ class RegisterRestServlet(ClientV1RestServlet):
 
         want_mac = hmac.new(
             key=self.hs.config.registration_shared_secret,
-            msg=user,
             digestmod=sha1,
-        ).hexdigest()
-
-        password = register_json["password"].encode("utf-8")
+        )
+        want_mac.update(user)
+        want_mac.update("\x00")
+        want_mac.update(password)
+        want_mac.update("\x00")
+        want_mac.update("admin" if admin else "notadmin")
+        want_mac = want_mac.hexdigest()
 
         if compare_digest(want_mac, got_mac):
             handler = self.handlers.registration_handler
             user_id, token = yield handler.register(
                 localpart=user,
                 password=password,
+                admin=bool(admin),
             )
             self._remove_session(session)
             defer.returnValue({
@@ -410,12 +428,15 @@ class CreateUserRestServlet(ClientV1RestServlet):
             raise SynapseError(400, "Failed to parse 'duration_seconds'")
         if duration_seconds > self.direct_user_creation_max_duration:
             duration_seconds = self.direct_user_creation_max_duration
+        password_hash = user_json["password_hash"].encode("utf-8") \
+            if user_json.get("password_hash") else None
 
         handler = self.handlers.registration_handler
         user_id, token = yield handler.get_or_create_user(
             localpart=localpart,
             displayname=displayname,
-            duration_seconds=duration_seconds
+            duration_in_ms=(duration_seconds * 1000),
+            password_hash=password_hash
         )
 
         defer.returnValue({
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 86fbe2747d..866a1e9120 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -20,12 +20,14 @@ from .base import ClientV1RestServlet, client_path_patterns
 from synapse.api.errors import SynapseError, Codes, AuthError
 from synapse.streams.config import PaginationConfig
 from synapse.api.constants import EventTypes, Membership
+from synapse.api.filtering import Filter
 from synapse.types import UserID, RoomID, RoomAlias
 from synapse.events.utils import serialize_event
 from synapse.http.servlet import parse_json_object_from_request
 
 import logging
 import urllib
+import ujson as json
 
 logger = logging.getLogger(__name__)
 
@@ -327,12 +329,19 @@ class RoomMessageListRestServlet(ClientV1RestServlet):
             request, default_limit=10,
         )
         as_client_event = "raw" not in request.args
+        filter_bytes = request.args.get("filter", None)
+        if filter_bytes:
+            filter_json = urllib.unquote(filter_bytes[-1]).decode("UTF-8")
+            event_filter = Filter(json.loads(filter_json))
+        else:
+            event_filter = None
         handler = self.handlers.message_handler
         msgs = yield handler.get_messages(
             room_id=room_id,
             requester=requester,
             pagin_config=pagination_config,
-            as_client_event=as_client_event
+            as_client_event=as_client_event,
+            event_filter=event_filter,
         )
 
         defer.returnValue((200, msgs))
diff --git a/synapse/rest/client/v2_alpha/_base.py b/synapse/rest/client/v2_alpha/_base.py
index b6faa2b0e6..20e765f48f 100644
--- a/synapse/rest/client/v2_alpha/_base.py
+++ b/synapse/rest/client/v2_alpha/_base.py
@@ -25,7 +25,9 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-def client_v2_patterns(path_regex, releases=(0,)):
+def client_v2_patterns(path_regex, releases=(0,),
+                       v2_alpha=True,
+                       unstable=True):
     """Creates a regex compiled client path with the correct client path
     prefix.
 
@@ -35,9 +37,12 @@ def client_v2_patterns(path_regex, releases=(0,)):
     Returns:
         SRE_Pattern
     """
-    patterns = [re.compile("^" + CLIENT_V2_ALPHA_PREFIX + path_regex)]
-    unstable_prefix = CLIENT_V2_ALPHA_PREFIX.replace("/v2_alpha", "/unstable")
-    patterns.append(re.compile("^" + unstable_prefix + path_regex))
+    patterns = []
+    if v2_alpha:
+        patterns.append(re.compile("^" + CLIENT_V2_ALPHA_PREFIX + path_regex))
+    if unstable:
+        unstable_prefix = CLIENT_V2_ALPHA_PREFIX.replace("/v2_alpha", "/unstable")
+        patterns.append(re.compile("^" + unstable_prefix + path_regex))
     for release in releases:
         new_prefix = CLIENT_V2_ALPHA_PREFIX.replace("/v2_alpha", "/r%d" % release)
         patterns.append(re.compile("^" + new_prefix + path_regex))
diff --git a/synapse/rest/client/v2_alpha/account.py b/synapse/rest/client/v2_alpha/account.py
index 9a84873a5f..eb49ad62e9 100644
--- a/synapse/rest/client/v2_alpha/account.py
+++ b/synapse/rest/client/v2_alpha/account.py
@@ -28,8 +28,40 @@ import logging
 logger = logging.getLogger(__name__)
 
 
+class PasswordRequestTokenRestServlet(RestServlet):
+    PATTERNS = client_v2_patterns("/account/password/email/requestToken$")
+
+    def __init__(self, hs):
+        super(PasswordRequestTokenRestServlet, self).__init__()
+        self.hs = hs
+        self.identity_handler = hs.get_handlers().identity_handler
+
+    @defer.inlineCallbacks
+    def on_POST(self, request):
+        body = parse_json_object_from_request(request)
+
+        required = ['id_server', 'client_secret', 'email', 'send_attempt']
+        absent = []
+        for k in required:
+            if k not in body:
+                absent.append(k)
+
+        if absent:
+            raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
+
+        existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
+            'email', body['email']
+        )
+
+        if existingUid is None:
+            raise SynapseError(400, "Email not found", Codes.THREEPID_NOT_FOUND)
+
+        ret = yield self.identity_handler.requestEmailToken(**body)
+        defer.returnValue((200, ret))
+
+
 class PasswordRestServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/account/password")
+    PATTERNS = client_v2_patterns("/account/password$")
 
     def __init__(self, hs):
         super(PasswordRestServlet, self).__init__()
@@ -89,8 +121,83 @@ class PasswordRestServlet(RestServlet):
         return 200, {}
 
 
+class DeactivateAccountRestServlet(RestServlet):
+    PATTERNS = client_v2_patterns("/account/deactivate$")
+
+    def __init__(self, hs):
+        self.hs = hs
+        self.store = hs.get_datastore()
+        self.auth = hs.get_auth()
+        self.auth_handler = hs.get_auth_handler()
+        super(DeactivateAccountRestServlet, self).__init__()
+
+    @defer.inlineCallbacks
+    def on_POST(self, request):
+        body = parse_json_object_from_request(request)
+
+        authed, result, params, _ = yield self.auth_handler.check_auth([
+            [LoginType.PASSWORD],
+        ], body, self.hs.get_ip_from_request(request))
+
+        if not authed:
+            defer.returnValue((401, result))
+
+        user_id = None
+        requester = None
+
+        if LoginType.PASSWORD in result:
+            # if using password, they should also be logged in
+            requester = yield self.auth.get_user_by_req(request)
+            user_id = requester.user.to_string()
+            if user_id != result[LoginType.PASSWORD]:
+                raise LoginError(400, "", Codes.UNKNOWN)
+        else:
+            logger.error("Auth succeeded but no known type!", result.keys())
+            raise SynapseError(500, "", Codes.UNKNOWN)
+
+        # FIXME: Theoretically there is a race here wherein user resets password
+        # using threepid.
+        yield self.store.user_delete_access_tokens(user_id)
+        yield self.store.user_delete_threepids(user_id)
+        yield self.store.user_set_password_hash(user_id, None)
+
+        defer.returnValue((200, {}))
+
+
+class ThreepidRequestTokenRestServlet(RestServlet):
+    PATTERNS = client_v2_patterns("/account/3pid/email/requestToken$")
+
+    def __init__(self, hs):
+        self.hs = hs
+        super(ThreepidRequestTokenRestServlet, self).__init__()
+        self.identity_handler = hs.get_handlers().identity_handler
+
+    @defer.inlineCallbacks
+    def on_POST(self, request):
+        body = parse_json_object_from_request(request)
+
+        required = ['id_server', 'client_secret', 'email', 'send_attempt']
+        absent = []
+        for k in required:
+            if k not in body:
+                absent.append(k)
+
+        if absent:
+            raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
+
+        existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
+            'email', body['email']
+        )
+
+        if existingUid is not None:
+            raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
+
+        ret = yield self.identity_handler.requestEmailToken(**body)
+        defer.returnValue((200, ret))
+
+
 class ThreepidRestServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/account/3pid")
+    PATTERNS = client_v2_patterns("/account/3pid$")
 
     def __init__(self, hs):
         super(ThreepidRestServlet, self).__init__()
@@ -157,5 +264,8 @@ class ThreepidRestServlet(RestServlet):
 
 
 def register_servlets(hs, http_server):
+    PasswordRequestTokenRestServlet(hs).register(http_server)
     PasswordRestServlet(hs).register(http_server)
+    DeactivateAccountRestServlet(hs).register(http_server)
+    ThreepidRequestTokenRestServlet(hs).register(http_server)
     ThreepidRestServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v2_alpha/devices.py b/synapse/rest/client/v2_alpha/devices.py
new file mode 100644
index 0000000000..8fbd3d3dfc
--- /dev/null
+++ b/synapse/rest/client/v2_alpha/devices.py
@@ -0,0 +1,100 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015, 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.
+
+import logging
+
+from twisted.internet import defer
+
+from synapse.http import servlet
+from ._base import client_v2_patterns
+
+logger = logging.getLogger(__name__)
+
+
+class DevicesRestServlet(servlet.RestServlet):
+    PATTERNS = client_v2_patterns("/devices$", releases=[], v2_alpha=False)
+
+    def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
+        super(DevicesRestServlet, self).__init__()
+        self.hs = hs
+        self.auth = hs.get_auth()
+        self.device_handler = hs.get_device_handler()
+
+    @defer.inlineCallbacks
+    def on_GET(self, request):
+        requester = yield self.auth.get_user_by_req(request)
+        devices = yield self.device_handler.get_devices_by_user(
+            requester.user.to_string()
+        )
+        defer.returnValue((200, {"devices": devices}))
+
+
+class DeviceRestServlet(servlet.RestServlet):
+    PATTERNS = client_v2_patterns("/devices/(?P<device_id>[^/]*)$",
+                                  releases=[], v2_alpha=False)
+
+    def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
+        super(DeviceRestServlet, self).__init__()
+        self.hs = hs
+        self.auth = hs.get_auth()
+        self.device_handler = hs.get_device_handler()
+
+    @defer.inlineCallbacks
+    def on_GET(self, request, device_id):
+        requester = yield self.auth.get_user_by_req(request)
+        device = yield self.device_handler.get_device(
+            requester.user.to_string(),
+            device_id,
+        )
+        defer.returnValue((200, device))
+
+    @defer.inlineCallbacks
+    def on_DELETE(self, request, device_id):
+        # XXX: it's not completely obvious we want to expose this endpoint.
+        # It allows the client to delete access tokens, which feels like a
+        # thing which merits extra auth. But if we want to do the interactive-
+        # auth dance, we should really make it possible to delete more than one
+        # device at a time.
+        requester = yield self.auth.get_user_by_req(request)
+        yield self.device_handler.delete_device(
+            requester.user.to_string(),
+            device_id,
+        )
+        defer.returnValue((200, {}))
+
+    @defer.inlineCallbacks
+    def on_PUT(self, request, device_id):
+        requester = yield self.auth.get_user_by_req(request)
+
+        body = servlet.parse_json_object_from_request(request)
+        yield self.device_handler.update_device(
+            requester.user.to_string(),
+            device_id,
+            body
+        )
+        defer.returnValue((200, {}))
+
+
+def register_servlets(hs, http_server):
+    DevicesRestServlet(hs).register(http_server)
+    DeviceRestServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v2_alpha/keys.py b/synapse/rest/client/v2_alpha/keys.py
index 89ab39491c..c5ff16adf3 100644
--- a/synapse/rest/client/v2_alpha/keys.py
+++ b/synapse/rest/client/v2_alpha/keys.py
@@ -13,24 +13,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import logging
+
+import simplejson as json
+from canonicaljson import encode_canonical_json
 from twisted.internet import defer
 
+import synapse.api.errors
+import synapse.server
+import synapse.types
 from synapse.http.servlet import RestServlet, parse_json_object_from_request
 from synapse.types import UserID
-
-from canonicaljson import encode_canonical_json
-
 from ._base import client_v2_patterns
 
-import logging
-import simplejson as json
-
 logger = logging.getLogger(__name__)
 
 
 class KeyUploadServlet(RestServlet):
     """
-    POST /keys/upload/<device_id> HTTP/1.1
+    POST /keys/upload HTTP/1.1
     Content-Type: application/json
 
     {
@@ -53,23 +54,45 @@ class KeyUploadServlet(RestServlet):
       },
     }
     """
-    PATTERNS = client_v2_patterns("/keys/upload/(?P<device_id>[^/]*)", releases=())
+    PATTERNS = client_v2_patterns("/keys/upload(/(?P<device_id>[^/]+))?$",
+                                  releases=())
 
     def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
         super(KeyUploadServlet, self).__init__()
         self.store = hs.get_datastore()
         self.clock = hs.get_clock()
         self.auth = hs.get_auth()
+        self.device_handler = hs.get_device_handler()
 
     @defer.inlineCallbacks
     def on_POST(self, request, device_id):
         requester = yield self.auth.get_user_by_req(request)
+
         user_id = requester.user.to_string()
-        # TODO: Check that the device_id matches that in the authentication
-        # or derive the device_id from the authentication instead.
 
         body = parse_json_object_from_request(request)
 
+        if device_id is not None:
+            # passing the device_id here is deprecated; however, we allow it
+            # for now for compatibility with older clients.
+            if (requester.device_id is not None and
+                    device_id != requester.device_id):
+                logger.warning("Client uploading keys for a different device "
+                               "(logged in as %s, uploading for %s)",
+                               requester.device_id, device_id)
+        else:
+            device_id = requester.device_id
+
+        if device_id is None:
+            raise synapse.api.errors.SynapseError(
+                400,
+                "To upload keys, you must pass device_id when authenticating"
+            )
+
         time_now = self.clock.time_msec()
 
         # TODO: Validate the JSON to make sure it has the right keys.
@@ -102,13 +125,12 @@ class KeyUploadServlet(RestServlet):
                 user_id, device_id, time_now, key_list
             )
 
-        result = yield self.store.count_e2e_one_time_keys(user_id, device_id)
-        defer.returnValue((200, {"one_time_key_counts": result}))
-
-    @defer.inlineCallbacks
-    def on_GET(self, request, device_id):
-        requester = yield self.auth.get_user_by_req(request)
-        user_id = requester.user.to_string()
+        # the device should have been registered already, but it may have been
+        # deleted due to a race with a DELETE request. Or we may be using an
+        # old access_token without an associated device_id. Either way, we
+        # need to double-check the device is registered to avoid ending up with
+        # keys without a corresponding device.
+        self.device_handler.check_device_registered(user_id, device_id)
 
         result = yield self.store.count_e2e_one_time_keys(user_id, device_id)
         defer.returnValue((200, {"one_time_key_counts": result}))
@@ -162,17 +184,19 @@ class KeyQueryServlet(RestServlet):
     )
 
     def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer):
+        """
         super(KeyQueryServlet, self).__init__()
-        self.store = hs.get_datastore()
         self.auth = hs.get_auth()
-        self.federation = hs.get_replication_layer()
-        self.is_mine = hs.is_mine
+        self.e2e_keys_handler = hs.get_e2e_keys_handler()
 
     @defer.inlineCallbacks
     def on_POST(self, request, user_id, device_id):
         yield self.auth.get_user_by_req(request)
         body = parse_json_object_from_request(request)
-        result = yield self.handle_request(body)
+        result = yield self.e2e_keys_handler.query_devices(body)
         defer.returnValue(result)
 
     @defer.inlineCallbacks
@@ -181,45 +205,11 @@ class KeyQueryServlet(RestServlet):
         auth_user_id = requester.user.to_string()
         user_id = user_id if user_id else auth_user_id
         device_ids = [device_id] if device_id else []
-        result = yield self.handle_request(
+        result = yield self.e2e_keys_handler.query_devices(
             {"device_keys": {user_id: device_ids}}
         )
         defer.returnValue(result)
 
-    @defer.inlineCallbacks
-    def handle_request(self, body):
-        local_query = []
-        remote_queries = {}
-        for user_id, device_ids in body.get("device_keys", {}).items():
-            user = UserID.from_string(user_id)
-            if self.is_mine(user):
-                if not device_ids:
-                    local_query.append((user_id, None))
-                else:
-                    for device_id in device_ids:
-                        local_query.append((user_id, device_id))
-            else:
-                remote_queries.setdefault(user.domain, {})[user_id] = list(
-                    device_ids
-                )
-        results = yield self.store.get_e2e_device_keys(local_query)
-
-        json_result = {}
-        for user_id, device_keys in results.items():
-            for device_id, json_bytes in device_keys.items():
-                json_result.setdefault(user_id, {})[device_id] = json.loads(
-                    json_bytes
-                )
-
-        for destination, device_keys in remote_queries.items():
-            remote_result = yield self.federation.query_client_keys(
-                destination, {"device_keys": device_keys}
-            )
-            for user_id, keys in remote_result["device_keys"].items():
-                if user_id in device_keys:
-                    json_result[user_id] = keys
-        defer.returnValue((200, {"device_keys": json_result}))
-
 
 class OneTimeKeyServlet(RestServlet):
     """
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index 2088c316d1..943f5676a3 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -41,17 +41,59 @@ else:
 logger = logging.getLogger(__name__)
 
 
+class RegisterRequestTokenRestServlet(RestServlet):
+    PATTERNS = client_v2_patterns("/register/email/requestToken$")
+
+    def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
+        super(RegisterRequestTokenRestServlet, self).__init__()
+        self.hs = hs
+        self.identity_handler = hs.get_handlers().identity_handler
+
+    @defer.inlineCallbacks
+    def on_POST(self, request):
+        body = parse_json_object_from_request(request)
+
+        required = ['id_server', 'client_secret', 'email', 'send_attempt']
+        absent = []
+        for k in required:
+            if k not in body:
+                absent.append(k)
+
+        if len(absent) > 0:
+            raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
+
+        existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
+            'email', body['email']
+        )
+
+        if existingUid is not None:
+            raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
+
+        ret = yield self.identity_handler.requestEmailToken(**body)
+        defer.returnValue((200, ret))
+
+
 class RegisterRestServlet(RestServlet):
-    PATTERNS = client_v2_patterns("/register")
+    PATTERNS = client_v2_patterns("/register$")
 
     def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer): server
+        """
         super(RegisterRestServlet, self).__init__()
+
         self.hs = hs
         self.auth = hs.get_auth()
         self.store = hs.get_datastore()
         self.auth_handler = hs.get_auth_handler()
         self.registration_handler = hs.get_handlers().registration_handler
         self.identity_handler = hs.get_handlers().identity_handler
+        self.device_handler = hs.get_device_handler()
 
     @defer.inlineCallbacks
     def on_POST(self, request):
@@ -70,10 +112,6 @@ class RegisterRestServlet(RestServlet):
                 "Do not understand membership kind: %s" % (kind,)
             )
 
-        if '/register/email/requestToken' in request.path:
-            ret = yield self.onEmailTokenRequest(request)
-            defer.returnValue(ret)
-
         body = parse_json_object_from_request(request)
 
         # we do basic sanity checks here because the auth layer will store these
@@ -104,11 +142,12 @@ class RegisterRestServlet(RestServlet):
             # Set the desired user according to the AS API (which uses the
             # 'user' key not 'username'). Since this is a new addition, we'll
             # fallback to 'username' if they gave one.
-            if isinstance(body.get("user"), basestring):
-                desired_username = body["user"]
-            result = yield self._do_appservice_registration(
-                desired_username, request.args["access_token"][0]
-            )
+            desired_username = body.get("user", desired_username)
+
+            if isinstance(desired_username, basestring):
+                result = yield self._do_appservice_registration(
+                    desired_username, request.args["access_token"][0], body
+                )
             defer.returnValue((200, result))  # we throw for non 200 responses
             return
 
@@ -117,7 +156,7 @@ class RegisterRestServlet(RestServlet):
             # FIXME: Should we really be determining if this is shared secret
             # auth based purely on the 'mac' key?
             result = yield self._do_shared_secret_registration(
-                desired_username, desired_password, body["mac"]
+                desired_username, desired_password, body
             )
             defer.returnValue((200, result))  # we throw for non 200 responses
             return
@@ -157,12 +196,12 @@ class RegisterRestServlet(RestServlet):
                 [LoginType.EMAIL_IDENTITY]
             ]
 
-        authed, result, params, session_id = yield self.auth_handler.check_auth(
+        authed, auth_result, params, session_id = yield self.auth_handler.check_auth(
             flows, body, self.hs.get_ip_from_request(request)
         )
 
         if not authed:
-            defer.returnValue((401, result))
+            defer.returnValue((401, auth_result))
             return
 
         if registered_user_id is not None:
@@ -170,106 +209,58 @@ class RegisterRestServlet(RestServlet):
                 "Already registered user ID %r for this session",
                 registered_user_id
             )
-            access_token = yield self.auth_handler.issue_access_token(registered_user_id)
-            refresh_token = yield self.auth_handler.issue_refresh_token(
-                registered_user_id
+            # don't re-register the email address
+            add_email = False
+        else:
+            # NB: This may be from the auth handler and NOT from the POST
+            if 'password' not in params:
+                raise SynapseError(400, "Missing password.",
+                                   Codes.MISSING_PARAM)
+
+            desired_username = params.get("username", None)
+            new_password = params.get("password", None)
+            guest_access_token = params.get("guest_access_token", None)
+
+            (registered_user_id, _) = yield self.registration_handler.register(
+                localpart=desired_username,
+                password=new_password,
+                guest_access_token=guest_access_token,
+                generate_token=False,
             )
-            defer.returnValue((200, {
-                "user_id": registered_user_id,
-                "access_token": access_token,
-                "home_server": self.hs.hostname,
-                "refresh_token": refresh_token,
-            }))
-
-        # NB: This may be from the auth handler and NOT from the POST
-        if 'password' not in params:
-            raise SynapseError(400, "Missing password.", Codes.MISSING_PARAM)
-
-        desired_username = params.get("username", None)
-        new_password = params.get("password", None)
-        guest_access_token = params.get("guest_access_token", None)
-
-        (user_id, token) = yield self.registration_handler.register(
-            localpart=desired_username,
-            password=new_password,
-            guest_access_token=guest_access_token,
-        )
 
-        # remember that we've now registered that user account, and with what
-        # user ID (since the user may not have specified)
-        self.auth_handler.set_session_data(
-            session_id, "registered_user_id", user_id
+            # remember that we've now registered that user account, and with
+            #  what user ID (since the user may not have specified)
+            self.auth_handler.set_session_data(
+                session_id, "registered_user_id", registered_user_id
+            )
+
+            add_email = True
+
+        return_dict = yield self._create_registration_details(
+            registered_user_id, params
         )
 
-        if result and LoginType.EMAIL_IDENTITY in result:
-            threepid = result[LoginType.EMAIL_IDENTITY]
-
-            for reqd in ['medium', 'address', 'validated_at']:
-                if reqd not in threepid:
-                    logger.info("Can't add incomplete 3pid")
-                else:
-                    yield self.auth_handler.add_threepid(
-                        user_id,
-                        threepid['medium'],
-                        threepid['address'],
-                        threepid['validated_at'],
-                    )
-
-                    # And we add an email pusher for them by default, but only
-                    # if email notifications are enabled (so people don't start
-                    # getting mail spam where they weren't before if email
-                    # notifs are set up on a home server)
-                    if (
-                        self.hs.config.email_enable_notifs and
-                        self.hs.config.email_notif_for_new_users
-                    ):
-                        # Pull the ID of the access token back out of the db
-                        # It would really make more sense for this to be passed
-                        # up when the access token is saved, but that's quite an
-                        # invasive change I'd rather do separately.
-                        user_tuple = yield self.store.get_user_by_access_token(
-                            token
-                        )
-
-                        yield self.hs.get_pusherpool().add_pusher(
-                            user_id=user_id,
-                            access_token=user_tuple["token_id"],
-                            kind="email",
-                            app_id="m.email",
-                            app_display_name="Email Notifications",
-                            device_display_name=threepid["address"],
-                            pushkey=threepid["address"],
-                            lang=None,  # We don't know a user's language here
-                            data={},
-                        )
-
-            if 'bind_email' in params and params['bind_email']:
-                logger.info("bind_email specified: binding")
-
-                emailThreepid = result[LoginType.EMAIL_IDENTITY]
-                threepid_creds = emailThreepid['threepid_creds']
-                logger.debug("Binding emails %s to %s" % (
-                    emailThreepid, user_id
-                ))
-                yield self.identity_handler.bind_threepid(threepid_creds, user_id)
-            else:
-                logger.info("bind_email not specified: not binding email")
-
-        result = yield self._create_registration_details(user_id, token)
-        defer.returnValue((200, result))
+        if add_email and auth_result and LoginType.EMAIL_IDENTITY in auth_result:
+            threepid = auth_result[LoginType.EMAIL_IDENTITY]
+            yield self._register_email_threepid(
+                registered_user_id, threepid, return_dict["access_token"],
+                params.get("bind_email")
+            )
+
+        defer.returnValue((200, return_dict))
 
     def on_OPTIONS(self, _):
         return 200, {}
 
     @defer.inlineCallbacks
-    def _do_appservice_registration(self, username, as_token):
-        (user_id, token) = yield self.registration_handler.appservice_register(
+    def _do_appservice_registration(self, username, as_token, body):
+        user_id = yield self.registration_handler.appservice_register(
             username, as_token
         )
-        defer.returnValue((yield self._create_registration_details(user_id, token)))
+        defer.returnValue((yield self._create_registration_details(user_id, body)))
 
     @defer.inlineCallbacks
-    def _do_shared_secret_registration(self, username, password, mac):
+    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")
 
@@ -277,7 +268,7 @@ class RegisterRestServlet(RestServlet):
 
         # str() because otherwise hmac complains that 'unicode' does not
         # have the buffer interface
-        got_mac = str(mac)
+        got_mac = str(body["mac"])
 
         want_mac = hmac.new(
             key=self.hs.config.registration_shared_secret,
@@ -290,43 +281,132 @@ class RegisterRestServlet(RestServlet):
                 403, "HMAC incorrect",
             )
 
-        (user_id, token) = yield self.registration_handler.register(
-            localpart=username, password=password
+        (user_id, _) = yield self.registration_handler.register(
+            localpart=username, password=password, generate_token=False,
         )
-        defer.returnValue((yield self._create_registration_details(user_id, token)))
 
-    @defer.inlineCallbacks
-    def _create_registration_details(self, user_id, token):
-        refresh_token = yield self.auth_handler.issue_refresh_token(user_id)
-        defer.returnValue({
-            "user_id": user_id,
-            "access_token": token,
-            "home_server": self.hs.hostname,
-            "refresh_token": refresh_token,
-        })
+        result = yield self._create_registration_details(user_id, body)
+        defer.returnValue(result)
 
     @defer.inlineCallbacks
-    def onEmailTokenRequest(self, request):
-        body = parse_json_object_from_request(request)
+    def _register_email_threepid(self, user_id, threepid, token, bind_email):
+        """Add an email address as a 3pid identifier
+
+        Also adds an email pusher for the email address, if configured in the
+        HS config
+
+        Also optionally binds emails to the given user_id on the identity server
+
+        Args:
+            user_id (str): id of user
+            threepid (object): m.login.email.identity auth response
+            token (str): access_token for the user
+            bind_email (bool): true if the client requested the email to be
+                bound at the identity server
+        Returns:
+            defer.Deferred:
+        """
+        reqd = ('medium', 'address', 'validated_at')
+        if any(x not in threepid for x in reqd):
+            logger.info("Can't add incomplete 3pid")
+            defer.returnValue()
+
+        yield self.auth_handler.add_threepid(
+            user_id,
+            threepid['medium'],
+            threepid['address'],
+            threepid['validated_at'],
+        )
 
-        required = ['id_server', 'client_secret', 'email', 'send_attempt']
-        absent = []
-        for k in required:
-            if k not in body:
-                absent.append(k)
+        # And we add an email pusher for them by default, but only
+        # if email notifications are enabled (so people don't start
+        # getting mail spam where they weren't before if email
+        # notifs are set up on a home server)
+        if (self.hs.config.email_enable_notifs and
+                self.hs.config.email_notif_for_new_users):
+            # Pull the ID of the access token back out of the db
+            # It would really make more sense for this to be passed
+            # up when the access token is saved, but that's quite an
+            # invasive change I'd rather do separately.
+            user_tuple = yield self.store.get_user_by_access_token(
+                token
+            )
+            token_id = user_tuple["token_id"]
+
+            yield self.hs.get_pusherpool().add_pusher(
+                user_id=user_id,
+                access_token=token_id,
+                kind="email",
+                app_id="m.email",
+                app_display_name="Email Notifications",
+                device_display_name=threepid["address"],
+                pushkey=threepid["address"],
+                lang=None,  # We don't know a user's language here
+                data={},
+            )
 
-        if len(absent) > 0:
-            raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
+        if bind_email:
+            logger.info("bind_email specified: binding")
+            logger.debug("Binding emails %s to %s" % (
+                threepid, user_id
+            ))
+            yield self.identity_handler.bind_threepid(
+                threepid['threepid_creds'], user_id
+            )
+        else:
+            logger.info("bind_email not specified: not binding email")
 
-        existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
-            'email', body['email']
+    @defer.inlineCallbacks
+    def _create_registration_details(self, user_id, params):
+        """Complete registration of newly-registered user
+
+        Allocates device_id if one was not given; also creates access_token
+        and refresh_token.
+
+        Args:
+            (str) user_id: full canonical @user:id
+            (object) params: registration parameters, from which we pull
+                device_id and initial_device_name
+        Returns:
+            defer.Deferred: (object) dictionary for response from /register
+        """
+        device_id = yield self._register_device(user_id, params)
+
+        access_token, refresh_token = (
+            yield self.auth_handler.get_login_tuple_for_user_id(
+                user_id, device_id=device_id,
+                initial_display_name=params.get("initial_device_display_name")
+            )
         )
 
-        if existingUid is not None:
-            raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
+        defer.returnValue({
+            "user_id": user_id,
+            "access_token": access_token,
+            "home_server": self.hs.hostname,
+            "refresh_token": refresh_token,
+            "device_id": device_id,
+        })
 
-        ret = yield self.identity_handler.requestEmailToken(**body)
-        defer.returnValue((200, ret))
+    def _register_device(self, user_id, params):
+        """Register a device for a user.
+
+        This is called after the user's credentials have been validated, but
+        before the access token has been issued.
+
+        Args:
+            (str) user_id: full canonical @user:id
+            (object) params: registration parameters, from which we pull
+                device_id and initial_device_name
+        Returns:
+            defer.Deferred: (str) device_id
+        """
+        # register the user's device
+        device_id = params.get("device_id")
+        initial_display_name = params.get("initial_device_display_name")
+        device_id = self.device_handler.check_device_registered(
+            user_id, device_id, initial_display_name
+        )
+        return device_id
 
     @defer.inlineCallbacks
     def _do_guest_registration(self):
@@ -336,7 +416,11 @@ class RegisterRestServlet(RestServlet):
             generate_token=False,
             make_guest=True
         )
-        access_token = self.auth_handler.generate_access_token(user_id, ["guest = true"])
+        access_token = self.auth_handler.generate_access_token(
+            user_id, ["guest = true"]
+        )
+        # XXX the "guest" caveat is not copied by /tokenrefresh. That's ok
+        # so long as we don't return a refresh_token here.
         defer.returnValue((200, {
             "user_id": user_id,
             "access_token": access_token,
@@ -345,4 +429,5 @@ class RegisterRestServlet(RestServlet):
 
 
 def register_servlets(hs, http_server):
+    RegisterRequestTokenRestServlet(hs).register(http_server)
     RegisterRestServlet(hs).register(http_server)
diff --git a/synapse/rest/client/v2_alpha/tokenrefresh.py b/synapse/rest/client/v2_alpha/tokenrefresh.py
index 8270e8787f..0d312c91d4 100644
--- a/synapse/rest/client/v2_alpha/tokenrefresh.py
+++ b/synapse/rest/client/v2_alpha/tokenrefresh.py
@@ -39,9 +39,13 @@ class TokenRefreshRestServlet(RestServlet):
         try:
             old_refresh_token = body["refresh_token"]
             auth_handler = self.hs.get_auth_handler()
-            (user_id, new_refresh_token) = yield self.store.exchange_refresh_token(
-                old_refresh_token, auth_handler.generate_refresh_token)
-            new_access_token = yield auth_handler.issue_access_token(user_id)
+            refresh_result = yield self.store.exchange_refresh_token(
+                old_refresh_token, auth_handler.generate_refresh_token
+            )
+            (user_id, new_refresh_token, device_id) = refresh_result
+            new_access_token = yield auth_handler.issue_access_token(
+                user_id, device_id
+            )
             defer.returnValue((200, {
                 "access_token": new_access_token,
                 "refresh_token": new_refresh_token,
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index ca5468c402..e984ea47db 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -26,7 +26,11 @@ class VersionsRestServlet(RestServlet):
 
     def on_GET(self, request):
         return (200, {
-            "versions": ["r0.0.1"]
+            "versions": [
+                "r0.0.1",
+                "r0.1.0",
+                "r0.2.0",
+            ]
         })
 
 
diff --git a/synapse/rest/media/v0/content_repository.py b/synapse/rest/media/v0/content_repository.py
index d9fc045fc6..956bd5da75 100644
--- a/synapse/rest/media/v0/content_repository.py
+++ b/synapse/rest/media/v0/content_repository.py
@@ -15,14 +15,12 @@
 
 from synapse.http.server import respond_with_json_bytes, finish_request
 
-from synapse.util.stringutils import random_string
 from synapse.api.errors import (
-    cs_exception, SynapseError, CodeMessageException, Codes, cs_error
+    Codes, cs_error
 )
 
 from twisted.protocols.basic import FileSender
 from twisted.web import server, resource
-from twisted.internet import defer
 
 import base64
 import simplejson as json
@@ -50,64 +48,10 @@ class ContentRepoResource(resource.Resource):
     """
     isLeaf = True
 
-    def __init__(self, hs, directory, auth, external_addr):
+    def __init__(self, hs, directory):
         resource.Resource.__init__(self)
         self.hs = hs
         self.directory = directory
-        self.auth = auth
-        self.external_addr = external_addr.rstrip('/')
-        self.max_upload_size = hs.config.max_upload_size
-
-        if not os.path.isdir(self.directory):
-            os.mkdir(self.directory)
-            logger.info("ContentRepoResource : Created %s directory.",
-                        self.directory)
-
-    @defer.inlineCallbacks
-    def map_request_to_name(self, request):
-        # auth the user
-        requester = yield self.auth.get_user_by_req(request)
-
-        # namespace all file uploads on the user
-        prefix = base64.urlsafe_b64encode(
-            requester.user.to_string()
-        ).replace('=', '')
-
-        # use a random string for the main portion
-        main_part = random_string(24)
-
-        # suffix with a file extension if we can make one. This is nice to
-        # provide a hint to clients on the file information. We will also reuse
-        # this info to spit back the content type to the client.
-        suffix = ""
-        if request.requestHeaders.hasHeader("Content-Type"):
-            content_type = request.requestHeaders.getRawHeaders(
-                "Content-Type")[0]
-            suffix = "." + base64.urlsafe_b64encode(content_type)
-            if (content_type.split("/")[0].lower() in
-                    ["image", "video", "audio"]):
-                file_ext = content_type.split("/")[-1]
-                # be a little paranoid and only allow a-z
-                file_ext = re.sub("[^a-z]", "", file_ext)
-                suffix += "." + file_ext
-
-        file_name = prefix + main_part + suffix
-        file_path = os.path.join(self.directory, file_name)
-        logger.info("User %s is uploading a file to path %s",
-                    request.user.user_id.to_string(),
-                    file_path)
-
-        # keep trying to make a non-clashing file, with a sensible max attempts
-        attempts = 0
-        while os.path.exists(file_path):
-            main_part = random_string(24)
-            file_name = prefix + main_part + suffix
-            file_path = os.path.join(self.directory, file_name)
-            attempts += 1
-            if attempts > 25:  # really? Really?
-                raise SynapseError(500, "Unable to create file.")
-
-        defer.returnValue(file_path)
 
     def render_GET(self, request):
         # no auth here on purpose, to allow anyone to view, even across home
@@ -155,58 +99,6 @@ class ContentRepoResource(resource.Resource):
 
         return server.NOT_DONE_YET
 
-    def render_POST(self, request):
-        self._async_render(request)
-        return server.NOT_DONE_YET
-
     def render_OPTIONS(self, request):
         respond_with_json_bytes(request, 200, {}, send_cors=True)
         return server.NOT_DONE_YET
-
-    @defer.inlineCallbacks
-    def _async_render(self, request):
-        try:
-            # TODO: The checks here are a bit late. The content will have
-            # already been uploaded to a tmp file at this point
-            content_length = request.getHeader("Content-Length")
-            if content_length is None:
-                raise SynapseError(
-                    msg="Request must specify a Content-Length", code=400
-                )
-            if int(content_length) > self.max_upload_size:
-                raise SynapseError(
-                    msg="Upload request body is too large",
-                    code=413,
-                )
-
-            fname = yield self.map_request_to_name(request)
-
-            # TODO I have a suspicious feeling this is just going to block
-            with open(fname, "wb") as f:
-                f.write(request.content.read())
-
-            # FIXME (erikj): These should use constants.
-            file_name = os.path.basename(fname)
-            # FIXME: we can't assume what the repo's public mounted path is
-            # ...plus self-signed SSL won't work to remote clients anyway
-            # ...and we can't assume that it's SSL anyway, as we might want to
-            # serve it via the non-SSL listener...
-            url = "%s/_matrix/content/%s" % (
-                self.external_addr, file_name
-            )
-
-            respond_with_json_bytes(request, 200,
-                                    json.dumps({"content_token": url}),
-                                    send_cors=True)
-
-        except CodeMessageException as e:
-            logger.exception(e)
-            respond_with_json_bytes(request, e.code,
-                                    json.dumps(cs_exception(e)))
-        except Exception as e:
-            logger.error("Failed to store file: %s" % e)
-            respond_with_json_bytes(
-                request,
-                500,
-                json.dumps({"error": "Internal server error"}),
-                send_cors=True)
diff --git a/synapse/rest/media/v1/filepath.py b/synapse/rest/media/v1/filepath.py
index 422ab86fb3..0137458f71 100644
--- a/synapse/rest/media/v1/filepath.py
+++ b/synapse/rest/media/v1/filepath.py
@@ -65,3 +65,9 @@ class MediaFilePaths(object):
             file_id[0:2], file_id[2:4], file_id[4:],
             file_name
         )
+
+    def remote_media_thumbnail_dir(self, server_name, file_id):
+        return os.path.join(
+            self.base_path, "remote_thumbnail", server_name,
+            file_id[0:2], file_id[2:4], file_id[4:],
+        )
diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py
index 2468c3ac42..692e078419 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -30,11 +30,13 @@ from synapse.api.errors import SynapseError
 
 from twisted.internet import defer, threads
 
-from synapse.util.async import ObservableDeferred
+from synapse.util.async import Linearizer
 from synapse.util.stringutils import is_ascii
 from synapse.util.logcontext import preserve_context_over_fn
 
 import os
+import errno
+import shutil
 
 import cgi
 import logging
@@ -43,8 +45,11 @@ import urlparse
 logger = logging.getLogger(__name__)
 
 
+UPDATE_RECENTLY_ACCESSED_REMOTES_TS = 60 * 1000
+
+
 class MediaRepository(object):
-    def __init__(self, hs, filepaths):
+    def __init__(self, hs):
         self.auth = hs.get_auth()
         self.client = MatrixFederationHttpClient(hs)
         self.clock = hs.get_clock()
@@ -52,11 +57,28 @@ class MediaRepository(object):
         self.store = hs.get_datastore()
         self.max_upload_size = hs.config.max_upload_size
         self.max_image_pixels = hs.config.max_image_pixels
-        self.filepaths = filepaths
-        self.downloads = {}
+        self.filepaths = MediaFilePaths(hs.config.media_store_path)
         self.dynamic_thumbnails = hs.config.dynamic_thumbnails
         self.thumbnail_requirements = hs.config.thumbnail_requirements
 
+        self.remote_media_linearizer = Linearizer()
+
+        self.recently_accessed_remotes = set()
+
+        self.clock.looping_call(
+            self._update_recently_accessed_remotes,
+            UPDATE_RECENTLY_ACCESSED_REMOTES_TS
+        )
+
+    @defer.inlineCallbacks
+    def _update_recently_accessed_remotes(self):
+        media = self.recently_accessed_remotes
+        self.recently_accessed_remotes = set()
+
+        yield self.store.update_cached_last_access_time(
+            media, self.clock.time_msec()
+        )
+
     @staticmethod
     def _makedirs(filepath):
         dirname = os.path.dirname(filepath)
@@ -93,22 +115,12 @@ class MediaRepository(object):
 
         defer.returnValue("mxc://%s/%s" % (self.server_name, media_id))
 
+    @defer.inlineCallbacks
     def get_remote_media(self, server_name, media_id):
         key = (server_name, media_id)
-        download = self.downloads.get(key)
-        if download is None:
-            download = self._get_remote_media_impl(server_name, media_id)
-            download = ObservableDeferred(
-                download,
-                consumeErrors=True
-            )
-            self.downloads[key] = download
-
-            @download.addBoth
-            def callback(media_info):
-                del self.downloads[key]
-                return media_info
-        return download.observe()
+        with (yield self.remote_media_linearizer.queue(key)):
+            media_info = yield self._get_remote_media_impl(server_name, media_id)
+        defer.returnValue(media_info)
 
     @defer.inlineCallbacks
     def _get_remote_media_impl(self, server_name, media_id):
@@ -119,6 +131,11 @@ class MediaRepository(object):
             media_info = yield self._download_remote_file(
                 server_name, media_id
             )
+        else:
+            self.recently_accessed_remotes.add((server_name, media_id))
+            yield self.store.update_cached_last_access_time(
+                [(server_name, media_id)], self.clock.time_msec()
+            )
         defer.returnValue(media_info)
 
     @defer.inlineCallbacks
@@ -416,6 +433,41 @@ class MediaRepository(object):
             "height": m_height,
         })
 
+    @defer.inlineCallbacks
+    def delete_old_remote_media(self, before_ts):
+        old_media = yield self.store.get_remote_media_before(before_ts)
+
+        deleted = 0
+
+        for media in old_media:
+            origin = media["media_origin"]
+            media_id = media["media_id"]
+            file_id = media["filesystem_id"]
+            key = (origin, media_id)
+
+            logger.info("Deleting: %r", key)
+
+            with (yield self.remote_media_linearizer.queue(key)):
+                full_path = self.filepaths.remote_media_filepath(origin, file_id)
+                try:
+                    os.remove(full_path)
+                except OSError as e:
+                    logger.warn("Failed to remove file: %r", full_path)
+                    if e.errno == errno.ENOENT:
+                        pass
+                    else:
+                        continue
+
+                thumbnail_dir = self.filepaths.remote_media_thumbnail_dir(
+                    origin, file_id
+                )
+                shutil.rmtree(thumbnail_dir, ignore_errors=True)
+
+                yield self.store.delete_remote_media(origin, media_id)
+                deleted += 1
+
+        defer.returnValue({"deleted": deleted})
+
 
 class MediaRepositoryResource(Resource):
     """File uploading and downloading.
@@ -464,9 +516,8 @@ class MediaRepositoryResource(Resource):
 
     def __init__(self, hs):
         Resource.__init__(self)
-        filepaths = MediaFilePaths(hs.config.media_store_path)
 
-        media_repo = MediaRepository(hs, filepaths)
+        media_repo = hs.get_media_repository()
 
         self.putChild("upload", UploadResource(hs, media_repo))
         self.putChild("download", DownloadResource(hs, media_repo))
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 74c64f1371..bdd0e60c5b 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -29,6 +29,8 @@ from synapse.http.server import (
 from synapse.util.async import ObservableDeferred
 from synapse.util.stringutils import is_ascii
 
+from copy import deepcopy
+
 import os
 import re
 import fnmatch
@@ -329,20 +331,24 @@ class PreviewUrlResource(Resource):
                 # ...or if they are within a <script/> or <style/> tag.
                 # This is a very very very coarse approximation to a plain text
                 # render of the page.
-                text_nodes = tree.xpath("//text()[not(ancestor::header | ancestor::nav | "
-                                        "ancestor::aside | ancestor::footer | "
-                                        "ancestor::script | ancestor::style)]" +
-                                        "[ancestor::body]")
-                text = ''
-                for text_node in text_nodes:
-                    if len(text) < 500:
-                        text += text_node + ' '
-                    else:
-                        break
-                text = re.sub(r'[\t ]+', ' ', text)
-                text = re.sub(r'[\t \r\n]*[\r\n]+', '\n', text)
-                text = text.strip()[:500]
-                og['og:description'] = text if text else None
+
+                # We don't just use XPATH here as that is slow on some machines.
+
+                # We clone `tree` as we modify it.
+                cloned_tree = deepcopy(tree.find("body"))
+
+                TAGS_TO_REMOVE = ("header", "nav", "aside", "footer", "script", "style",)
+                for el in cloned_tree.iter(TAGS_TO_REMOVE):
+                    el.getparent().remove(el)
+
+                # Split all the text nodes into paragraphs (by splitting on new
+                # lines)
+                text_nodes = (
+                    re.sub(r'\s+', '\n', el.text).strip()
+                    for el in cloned_tree.iter()
+                    if el.text and isinstance(el.tag, basestring)  # Removes comments
+                )
+                og['og:description'] = summarize_paragraphs(text_nodes)
 
         # TODO: delete the url downloads to stop diskfilling,
         # as we only ever cared about its OG
@@ -450,3 +456,56 @@ class PreviewUrlResource(Resource):
             content_type.startswith("application/xhtml")
         ):
             return True
+
+
+def summarize_paragraphs(text_nodes, min_size=200, max_size=500):
+    # Try to get a summary of between 200 and 500 words, respecting
+    # first paragraph and then word boundaries.
+    # TODO: Respect sentences?
+
+    description = ''
+
+    # Keep adding paragraphs until we get to the MIN_SIZE.
+    for text_node in text_nodes:
+        if len(description) < min_size:
+            text_node = re.sub(r'[\t \r\n]+', ' ', text_node)
+            description += text_node + '\n\n'
+        else:
+            break
+
+    description = description.strip()
+    description = re.sub(r'[\t ]+', ' ', description)
+    description = re.sub(r'[\t \r\n]*[\r\n]+', '\n\n', description)
+
+    # If the concatenation of paragraphs to get above MIN_SIZE
+    # took us over MAX_SIZE, then we need to truncate mid paragraph
+    if len(description) > max_size:
+        new_desc = ""
+
+        # This splits the paragraph into words, but keeping the
+        # (preceeding) whitespace intact so we can easily concat
+        # words back together.
+        for match in re.finditer("\s*\S+", description):
+            word = match.group()
+
+            # Keep adding words while the total length is less than
+            # MAX_SIZE.
+            if len(word) + len(new_desc) < max_size:
+                new_desc += word
+            else:
+                # At this point the next word *will* take us over
+                # MAX_SIZE, but we also want to ensure that its not
+                # a huge word. If it is add it anyway and we'll
+                # truncate later.
+                if len(new_desc) < min_size:
+                    new_desc += word
+                break
+
+        # Double check that we're not over the limit
+        if len(new_desc) > max_size:
+            new_desc = new_desc[:max_size]
+
+        # We always add an ellipsis because at the very least
+        # we chopped mid paragraph.
+        description = new_desc.strip() + "…"
+    return description if description else None