Merge pull request #3236 from matrix-org/rav/consent_notice

Send users a server notice about consent

13 files changed, 322 insertions, 18 deletions

diff --git a/synapse/config/consent_config.py b/synapse/config/consent_config.py
index 675fce0911..8698b2993f 100644
--- a/synapse/config/consent_config.py
+++ b/synapse/config/consent_config.py
@@ -18,25 +18,49 @@ from ._base import Config
 DEFAULT_CONFIG = """\
 # User Consent configuration
 #
-# uncomment and configure if enabling the 'consent' resource under 'listeners'.
+# Parts of this section are required if enabling the 'consent' resource under
+# 'listeners', in particular 'template_dir' and 'version'.
 #
 # 'template_dir' gives the location of the templates for the HTML forms.
 # This directory should contain one subdirectory per language (eg, 'en', 'fr'),
 # and each language directory should contain the policy document (named as
 # '<version>.html') and a success page (success.html).
 #
-# 'default_version' gives the version of the policy document to serve up if
-# there is no 'v' parameter.
+# 'version' specifies the 'current' version of the policy document. It defines
+# the version to be served by the consent resource if there is no 'v'
+# parameter.
+#
+# 'server_notice_content', if enabled, will send a user a "Server Notice"
+# asking them to consent to the privacy policy. The 'server_notices' section
+# must also be configured for this to work.
 #
 # user_consent:
 #   template_dir: res/templates/privacy
-#   default_version: 1.0
+#   version: 1.0
+#   server_notice_content:
+#     msgtype: m.text
+#     body: |
+#       Pls do consent kthx
 """
 
 
 class ConsentConfig(Config):
+    def __init__(self):
+        super(ConsentConfig, self).__init__()
+
+        self.user_consent_version = None
+        self.user_consent_template_dir = None
+        self.user_consent_server_notice_content = None
+
     def read_config(self, config):
-        self.consent_config = config.get("user_consent")
+        consent_config = config.get("user_consent")
+        if consent_config is None:
+            return
+        self.user_consent_version = str(consent_config["version"])
+        self.user_consent_template_dir = consent_config["template_dir"]
+        self.user_consent_server_notice_content = consent_config.get(
+            "server_notice_content",
+        )
 
     def default_config(self, **kwargs):
         return DEFAULT_CONFIG
diff --git a/synapse/handlers/events.py b/synapse/handlers/events.py
index d3685fb12a..8bc642675f 100644
--- a/synapse/handlers/events.py
+++ b/synapse/handlers/events.py
@@ -48,6 +48,7 @@ class EventStreamHandler(BaseHandler):
 
         self.notifier = hs.get_notifier()
         self.state = hs.get_state_handler()
+        self._server_notices_sender = hs.get_server_notices_sender()
 
     @defer.inlineCallbacks
     @log_function
@@ -58,6 +59,10 @@ class EventStreamHandler(BaseHandler):
 
         If `only_keys` is not None, events from keys will be sent down.
         """
+
+        # send any outstanding server notices to the user.
+        yield self._server_notices_sender.on_user_syncing(auth_user_id)
+
         auth_user = UserID.from_string(auth_user_id)
         presence_handler = self.hs.get_presence_handler()
 
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 91218e40e6..500a131874 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -87,6 +87,11 @@ assert LAST_ACTIVE_GRANULARITY < IDLE_TIMER
 class PresenceHandler(object):
 
     def __init__(self, hs):
+        """
+
+        Args:
+            hs (synapse.server.HomeServer):
+        """
         self.is_mine = hs.is_mine
         self.is_mine_id = hs.is_mine_id
         self.clock = hs.get_clock()
@@ -94,7 +99,6 @@ class PresenceHandler(object):
         self.wheel_timer = WheelTimer()
         self.notifier = hs.get_notifier()
         self.federation = hs.get_federation_sender()
-
         self.state = hs.get_state_handler()
 
         federation_registry = hs.get_federation_registry()
diff --git a/synapse/replication/tcp/resource.py b/synapse/replication/tcp/resource.py
index a41af4fd6c..a603c520ea 100644
--- a/synapse/replication/tcp/resource.py
+++ b/synapse/replication/tcp/resource.py
@@ -69,6 +69,7 @@ class ReplicationStreamer(object):
         self.presence_handler = hs.get_presence_handler()
         self.clock = hs.get_clock()
         self.notifier = hs.get_notifier()
+        self._server_notices_sender = hs.get_server_notices_sender()
 
         # Current connections.
         self.connections = []
@@ -253,6 +254,7 @@ class ReplicationStreamer(object):
         yield self.store.insert_client_ip(
             user_id, access_token, ip, user_agent, device_id, last_seen,
         )
+        yield self._server_notices_sender.on_user_ip(user_id)
 
     def send_sync_to_all_connections(self, data):
         """Sends a SYNC command to all clients.
diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py
index eb91c0b293..a291cffbf1 100644
--- a/synapse/rest/client/v2_alpha/sync.py
+++ b/synapse/rest/client/v2_alpha/sync.py
@@ -85,6 +85,7 @@ class SyncRestServlet(RestServlet):
         self.clock = hs.get_clock()
         self.filtering = hs.get_filtering()
         self.presence_handler = hs.get_presence_handler()
+        self._server_notices_sender = hs.get_server_notices_sender()
 
     @defer.inlineCallbacks
     def on_GET(self, request):
@@ -149,6 +150,9 @@ class SyncRestServlet(RestServlet):
         else:
             since_token = None
 
+        # send any outstanding server notices to the user.
+        yield self._server_notices_sender.on_user_syncing(user.to_string())
+
         affect_presence = set_presence != PresenceState.OFFLINE
 
         if affect_presence:
diff --git a/synapse/rest/consent/consent_resource.py b/synapse/rest/consent/consent_resource.py
index d791302278..306385601c 100644
--- a/synapse/rest/consent/consent_resource.py
+++ b/synapse/rest/consent/consent_resource.py
@@ -95,8 +95,8 @@ class ConsentResource(Resource):
         # this is required by the request_handler wrapper
         self.clock = hs.get_clock()
 
-        consent_config = hs.config.consent_config
-        if consent_config is None:
+        self._default_consent_verison = hs.config.user_consent_version
+        if self._default_consent_verison is None:
             raise ConfigError(
                 "Consent resource is enabled but user_consent section is "
                 "missing in config file.",
@@ -104,7 +104,7 @@ class ConsentResource(Resource):
 
         # daemonize changes the cwd to /, so make the path absolute now.
         consent_template_directory = path.abspath(
-            consent_config["template_dir"],
+            hs.config.user_consent_template_dir,
         )
         if not path.isdir(consent_template_directory):
             raise ConfigError(
@@ -116,8 +116,6 @@ class ConsentResource(Resource):
         loader = jinja2.FileSystemLoader(consent_template_directory)
         self._jinja_env = jinja2.Environment(loader=loader)
 
-        self._default_consent_verison = consent_config["default_version"]
-
         if hs.config.form_secret is None:
             raise ConfigError(
                 "Consent resource is enabled but form_secret is not set in "
diff --git a/synapse/server.py b/synapse/server.py
index 85f54cd047..58dbf78437 100644
--- a/synapse/server.py
+++ b/synapse/server.py
@@ -73,6 +73,10 @@ from synapse.rest.media.v1.media_repository import (
     MediaRepositoryResource,
 )
 from synapse.server_notices.server_notices_manager import ServerNoticesManager
+from synapse.server_notices.server_notices_sender import ServerNoticesSender
+from synapse.server_notices.worker_server_notices_sender import (
+    WorkerServerNoticesSender,
+)
 from synapse.state import StateHandler, StateResolutionHandler
 from synapse.storage import DataStore
 from synapse.streams.events import EventSources
@@ -158,6 +162,7 @@ class HomeServer(object):
         'room_member_handler',
         'federation_registry',
         'server_notices_manager',
+        'server_notices_sender',
     ]
 
     def __init__(self, hostname, **kwargs):
@@ -401,8 +406,15 @@ class HomeServer(object):
         return FederationHandlerRegistry()
 
     def build_server_notices_manager(self):
+        if self.config.worker_app:
+            raise Exception("Workers cannot send server notices")
         return ServerNoticesManager(self)
 
+    def build_server_notices_sender(self):
+        if self.config.worker_app:
+            return WorkerServerNoticesSender(self)
+        return ServerNoticesSender(self)
+
     def remove_pusher(self, app_id, push_key, user_id):
         return self.get_pusherpool().remove_pusher(app_id, push_key, user_id)
 
diff --git a/synapse/server.pyi b/synapse/server.pyi
index 6fbe15168d..ce28486233 100644
--- a/synapse/server.pyi
+++ b/synapse/server.pyi
@@ -10,6 +10,7 @@ import synapse.handlers.e2e_keys
 import synapse.handlers.set_password
 import synapse.rest.media.v1.media_repository
 import synapse.server_notices.server_notices_manager
+import synapse.server_notices.server_notices_sender
 import synapse.state
 import synapse.storage
 
@@ -69,3 +70,6 @@ class HomeServer(object):
 
     def get_server_notices_manager(self) -> synapse.server_notices.server_notices_manager.ServerNoticesManager:
         pass
+
+    def get_server_notices_sender(self) -> synapse.server_notices.server_notices_sender.ServerNoticesSender:
+        pass
diff --git a/synapse/server_notices/consent_server_notices.py b/synapse/server_notices/consent_server_notices.py
new file mode 100644
index 0000000000..440f6b1cd4
--- /dev/null
+++ b/synapse/server_notices/consent_server_notices.py
@@ -0,0 +1,95 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+
+from twisted.internet import defer
+
+from synapse.api.errors import SynapseError
+from synapse.config import ConfigError
+
+logger = logging.getLogger(__name__)
+
+
+class ConsentServerNotices(object):
+    """Keeps track of whether we need to send users server_notices about
+    privacy policy consent, and sends one if we do.
+    """
+    def __init__(self, hs):
+        """
+
+        Args:
+            hs (synapse.server.HomeServer):
+        """
+        self._server_notices_manager = hs.get_server_notices_manager()
+        self._store = hs.get_datastore()
+
+        self._users_in_progress = set()
+
+        self._current_consent_version = hs.config.user_consent_version
+        self._server_notice_content = hs.config.user_consent_server_notice_content
+
+        if self._server_notice_content is not None:
+            if not self._server_notices_manager.is_enabled():
+                raise ConfigError(
+                    "user_consent configuration requires server notices, but "
+                    "server notices are not enabled.",
+                )
+            if 'body' not in self._server_notice_content:
+                raise ConfigError(
+                    "user_consent server_notice_consent must contain a 'body' "
+                    "key.",
+                )
+
+    @defer.inlineCallbacks
+    def maybe_send_server_notice_to_user(self, user_id):
+        """Check if we need to send a notice to this user, and does so if so
+
+        Args:
+            user_id (str): user to check
+
+        Returns:
+            Deferred
+        """
+        if self._server_notice_content is None:
+            # not enabled
+            return
+
+        # make sure we don't send two messages to the same user at once
+        if user_id in self._users_in_progress:
+            return
+        self._users_in_progress.add(user_id)
+        try:
+            u = yield self._store.get_user_by_id(user_id)
+
+            if u["consent_version"] == self._current_consent_version:
+                # user has already consented
+                return
+
+            if u["consent_server_notice_sent"] == self._current_consent_version:
+                # we've already sent a notice to the user
+                return
+
+            # need to send a message
+            try:
+                yield self._server_notices_manager.send_notice(
+                    user_id, self._server_notice_content,
+                )
+                yield self._store.user_set_consent_server_notice_sent(
+                    user_id, self._current_consent_version,
+                )
+            except SynapseError as e:
+                logger.error("Error sending server notice about user consent: %s", e)
+        finally:
+            self._users_in_progress.remove(user_id)
diff --git a/synapse/server_notices/server_notices_sender.py b/synapse/server_notices/server_notices_sender.py
new file mode 100644
index 0000000000..5d23965f34
--- /dev/null
+++ b/synapse/server_notices/server_notices_sender.py
@@ -0,0 +1,58 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from synapse.server_notices.consent_server_notices import ConsentServerNotices
+
+
+class ServerNoticesSender(object):
+    """A centralised place which sends server notices automatically when
+    Certain Events take place
+    """
+    def __init__(self, hs):
+        """
+
+        Args:
+            hs (synapse.server.HomeServer):
+        """
+        # todo: it would be nice to make this more dynamic
+        self._consent_server_notices = ConsentServerNotices(hs)
+
+    def on_user_syncing(self, user_id):
+        """Called when the user performs a sync operation.
+
+        Args:
+            user_id (str): mxid of user who synced
+
+        Returns:
+            Deferred
+        """
+        return self._consent_server_notices.maybe_send_server_notice_to_user(
+            user_id,
+        )
+
+    def on_user_ip(self, user_id):
+        """Called on the master when a worker process saw a client request.
+
+        Args:
+            user_id (str): mxid
+
+        Returns:
+            Deferred
+        """
+        # The synchrotrons use a stubbed version of ServerNoticesSender, so
+        # we check for notices to send to the user in on_user_ip as well as
+        # in on_user_syncing
+        return self._consent_server_notices.maybe_send_server_notice_to_user(
+            user_id,
+        )
diff --git a/synapse/server_notices/worker_server_notices_sender.py b/synapse/server_notices/worker_server_notices_sender.py
new file mode 100644
index 0000000000..25abb4ccf5
--- /dev/null
+++ b/synapse/server_notices/worker_server_notices_sender.py
@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from twisted.internet import defer
+
+
+class WorkerServerNoticesSender(object):
+    """Stub impl of ServerNoticesSender which does nothing"""
+    def __init__(self, hs):
+        """
+        Args:
+            hs (synapse.server.HomeServer):
+        """
+
+    def on_user_syncing(self, user_id):
+        """Called when the user performs a sync operation.
+
+        Args:
+            user_id (str): mxid of user who synced
+
+        Returns:
+            Deferred
+        """
+        return defer.succeed()
+
+    def on_user_ip(self, user_id):
+        """Called on the master when a worker process saw a client request.
+
+        Args:
+            user_id (str): mxid
+
+        Returns:
+            Deferred
+        """
+        raise AssertionError("on_user_ip unexpectedly called on worker")
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py
index 8d1a01f1ee..a530e29f43 100644
--- a/synapse/storage/registration.py
+++ b/synapse/storage/registration.py
@@ -33,7 +33,10 @@ class RegistrationWorkerStore(SQLBaseStore):
             keyvalues={
                 "name": user_id,
             },
-            retcols=["name", "password_hash", "is_guest"],
+            retcols=[
+                "name", "password_hash", "is_guest",
+                "consent_version", "consent_server_notice_sent",
+            ],
             allow_none=True,
             desc="get_user_by_id",
         )
@@ -297,12 +300,41 @@ class RegistrationStore(RegistrationWorkerStore,
         Raises:
             StoreError(404) if user not found
         """
-        return self._simple_update_one(
-            table='users',
-            keyvalues={'name': user_id, },
-            updatevalues={'consent_version': consent_version, },
-            desc="user_set_consent_version"
-        )
+        def f(txn):
+            self._simple_update_one_txn(
+                txn,
+                table='users',
+                keyvalues={'name': user_id, },
+                updatevalues={'consent_version': consent_version, },
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_user_by_id, (user_id,)
+            )
+        return self.runInteraction("user_set_consent_version", f)
+
+    def user_set_consent_server_notice_sent(self, user_id, consent_version):
+        """Updates the user table to record that we have sent the user a server
+        notice about privacy policy consent
+
+        Args:
+            user_id (str): full mxid of the user to update
+            consent_version (str): version of the policy we have notified the
+                user about
+
+        Raises:
+            StoreError(404) if user not found
+        """
+        def f(txn):
+            self._simple_update_one_txn(
+                txn,
+                table='users',
+                keyvalues={'name': user_id, },
+                updatevalues={'consent_server_notice_sent': consent_version, },
+            )
+            self._invalidate_cache_and_stream(
+                txn, self.get_user_by_id, (user_id,)
+            )
+        return self.runInteraction("user_set_consent_server_notice_sent", f)
 
     def user_delete_access_tokens(self, user_id, except_token_id=None,
                                   device_id=None):
diff --git a/synapse/storage/schema/delta/49/add_user_consent_server_notice_sent.sql b/synapse/storage/schema/delta/49/add_user_consent_server_notice_sent.sql
new file mode 100644
index 0000000000..14dcf18d73
--- /dev/null
+++ b/synapse/storage/schema/delta/49/add_user_consent_server_notice_sent.sql
@@ -0,0 +1,20 @@
+/* Copyright 2018 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* record whether we have sent a server notice about consenting to the
+ * privacy policy. Specifically records the version of the policy we sent
+ * a message about.
+ */
+ALTER TABLE users ADD COLUMN consent_server_notice_sent TEXT;