Add federation support for end-to-end key requests

5 files changed, 231 insertions, 30 deletions

diff --git a/synapse/federation/federation_client.py b/synapse/federation/federation_client.py
index 7736d14fb5..21a86a4c6d 100644
--- a/synapse/federation/federation_client.py
+++ b/synapse/federation/federation_client.py
@@ -134,6 +134,40 @@ class FederationClient(FederationBase):
             destination, query_type, args, retry_on_dns_fail=retry_on_dns_fail
         )
 
+    @log_function
+    def query_client_keys(self, destination, content, retry_on_dns_fail=True):
+        """Query device keys for a device hosted on a remote server.
+
+        Args:
+            destination (str): Domain name of the remote homeserver
+            content (dict): The query content.
+
+        Returns:
+            a Deferred which will eventually yield a JSON object from the
+            response
+        """
+        sent_queries_counter.inc("client_device_keys")
+        return self.transport_layer.query_client_keys(
+            destination, content, retry_on_dns_fail=retry_on_dns_fail
+        )
+
+    @log_function
+    def claim_client_keys(self, destination, content, retry_on_dns_fail=True):
+        """Claims one-time keys for a device hosted on a remote server.
+
+        Args:
+            destination (str): Domain name of the remote homeserver
+            content (dict): The query content.
+
+        Returns:
+            a Deferred which will eventually yield a JSON object from the
+            response
+        """
+        sent_queries_counter.inc("client_one_time_keys")
+        return self.transport_layer.claim_client_keys(
+            destination, content, retry_on_dns_fail=retry_on_dns_fail
+        )
+
     @defer.inlineCallbacks
     @log_function
     def backfill(self, dest, context, limit, extremities):
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index cd79e23f4b..c32908ac28 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -27,6 +27,7 @@ from synapse.api.errors import FederationError, SynapseError
 
 from synapse.crypto.event_signing import compute_event_signature
 
+import simplejson as json
 import logging
 
 
@@ -314,6 +315,42 @@ class FederationServer(FederationBase):
 
     @defer.inlineCallbacks
     @log_function
+    def on_query_client_keys(self, origin, content):
+        query = []
+        for user_id, device_ids in content.get("device_keys", {}).items():
+            if not device_ids:
+                query.append((user_id, None))
+            else:
+                for device_id in device_ids:
+                    query.append((user_id, device_id))
+        results = yield self.store.get_e2e_device_keys(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
+                )
+        defer.returnValue({"device_keys": json_result})
+
+    @defer.inlineCallbacks
+    @log_function
+    def on_claim_client_keys(self, origin, content):
+        query = []
+        for user_id, device_keys in content.get("one_time_keys", {}).items():
+            for device_id, algorithm in device_keys.items():
+                query.append((user_id, device_id, algorithm))
+        results = yield self.store.claim_e2e_one_time_keys(query)
+        json_result = {}
+        for user_id, device_keys in results.items():
+            for device_id, keys in device_keys.items():
+                for key_id, json_bytes in keys.items():
+                    json_result.setdefault(user_id, {})[device_id] = {
+                        key_id: json.loads(json_bytes)
+                    }
+        defer.returnValue({"one_time_keys": json_result})
+
+    @defer.inlineCallbacks
+    @log_function
     def on_get_missing_events(self, origin, room_id, earliest_events,
                               latest_events, limit, min_depth):
         missing_events = yield self.handler.on_get_missing_events(
diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
index 610a4c3163..df5083dd22 100644
--- a/synapse/federation/transport/client.py
+++ b/synapse/federation/transport/client.py
@@ -224,6 +224,76 @@ class TransportLayerClient(object):
 
     @defer.inlineCallbacks
     @log_function
+    def query_client_keys(self, destination, query_content):
+        """Query the device keys for a list of user ids hosted on a remote
+        server.
+
+        Request:
+            {
+              "device_keys": {
+                "<user_id>": ["<device_id>"]
+            } }
+
+        Response:
+            {
+              "device_keys": {
+                "<user_id>": {
+                  "<device_id>": {...}
+            } } }
+
+        Args:
+            destination(str): The server to query.
+            query_content(dict): The user ids to query.
+        Returns:
+            A dict containg the device keys.
+        """
+        path = PREFIX + "/client_keys/query"
+
+        content = yield self.client.post_json(
+            destination=destination,
+            path=path,
+            data=query_content,
+        )
+        defer.returnValue(content)
+
+    @defer.inlineCallbacks
+    @log_function
+    def claim_client_keys(self, destination, query_content):
+        """Claim one-time keys for a list of devices hosted on a remote server.
+
+        Request:
+            {
+              "one_time_keys": {
+                "<user_id>": {
+                    "<device_id>": "<algorithm>"
+            } } }
+
+        Response:
+            {
+              "device_keys": {
+                "<user_id>": {
+                  "<device_id>": {
+                    "<algorithm>:<key_id>": "<key_base64>"
+            } } } }
+
+        Args:
+            destination(str): The server to query.
+            query_content(dict): The user ids to query.
+        Returns:
+            A dict containg the one-time keys.
+        """
+
+        path = PREFIX + "/client_keys/claim"
+
+        content = yield self.client.post_json(
+            destination=destination,
+            path=path,
+            data=query_content,
+        )
+        defer.returnValue(content)
+
+    @defer.inlineCallbacks
+    @log_function
     def get_missing_events(self, destination, room_id, earliest_events,
                            latest_events, limit, min_depth):
         path = PREFIX + "/get_missing_events/%s" % (room_id,)
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py
index bad93c6b2f..fb59383ecd 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -325,6 +325,24 @@ class FederationInviteServlet(BaseFederationServlet):
         defer.returnValue((200, content))
 
 
+class FederationClientKeysQueryServlet(BaseFederationServlet):
+    PATH = "/client_keys/query"
+
+    @defer.inlineCallbacks
+    def on_POST(self, origin, content):
+        response = yield self.handler.on_client_key_query(origin, content)
+        defer.returnValue((200, response))
+
+
+class FederationClientKeysClaimServlet(BaseFederationServlet):
+    PATH = "/client_keys/claim"
+
+    @defer.inlineCallbacks
+    def on_POST(self, origin, content):
+        response = yield self.handler.on_client_key_claim(origin, content)
+        defer.returnValue((200, response))
+
+
 class FederationQueryAuthServlet(BaseFederationServlet):
     PATH = "/query_auth/([^/]*)/([^/]*)"
 
@@ -373,4 +391,6 @@ SERVLET_CLASSES = (
     FederationQueryAuthServlet,
     FederationGetMissingEventsServlet,
     FederationEventAuthServlet,
+    FederationClientKeysQueryServlet,
+    FederationClientKeysClaimServlet,
 )
diff --git a/synapse/rest/client/v2_alpha/keys.py b/synapse/rest/client/v2_alpha/keys.py
index 5f3a6207b5..739a08ada8 100644
--- a/synapse/rest/client/v2_alpha/keys.py
+++ b/synapse/rest/client/v2_alpha/keys.py
@@ -17,6 +17,7 @@ from twisted.internet import defer
 
 from synapse.api.errors import SynapseError
 from synapse.http.servlet import RestServlet
+from synapse.types import UserID
 from syutil.jsonutil import encode_canonical_json
 
 from ._base import client_v2_pattern
@@ -164,45 +165,63 @@ class KeyQueryServlet(RestServlet):
         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
 
     @defer.inlineCallbacks
     def on_POST(self, request, user_id, device_id):
-        logger.debug("onPOST")
         yield self.auth.get_user_by_req(request)
         try:
             body = json.loads(request.content.read())
         except:
             raise SynapseError(400, "Invalid key JSON")
-        query = []
-        for user_id, device_ids in body.get("device_keys", {}).items():
-            if not device_ids:
-                query.append((user_id, None))
-            else:
-                for device_id in device_ids:
-                    query.append((user_id, device_id))
-        results = yield self.store.get_e2e_device_keys(query)
-        defer.returnValue(self.json_result(request, results))
+        result = yield self.handle_request(body)
+        defer.returnValue(result)
 
     @defer.inlineCallbacks
     def on_GET(self, request, user_id, device_id):
         auth_user, client_info = yield self.auth.get_user_by_req(request)
         auth_user_id = auth_user.to_string()
-        if not user_id:
-            user_id = auth_user_id
-        if not device_id:
-            device_id = None
-        # Returns a map of user_id->device_id->json_bytes.
-        results = yield self.store.get_e2e_device_keys([(user_id, device_id)])
-        defer.returnValue(self.json_result(request, results))
-
-    def json_result(self, request, results):
+        user_id = user_id if user_id else auth_user_id
+        device_ids = [device_id] if device_id else []
+        result = yield self.handle_request(
+            {"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.set_default(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
                 )
-        return (200, {"device_keys": json_result})
+
+        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.items():
+                if user_id in device_keys:
+                    json_result[user_id] = keys
+        defer.returnValue((200, {"device_keys": json_result}))
 
 
 class OneTimeKeyServlet(RestServlet):
@@ -236,14 +255,16 @@ class OneTimeKeyServlet(RestServlet):
         self.store = hs.get_datastore()
         self.auth = hs.get_auth()
         self.clock = hs.get_clock()
+        self.federation = hs.get_replication_layer()
+        self.is_mine = hs.is_mine
 
     @defer.inlineCallbacks
     def on_GET(self, request, user_id, device_id, algorithm):
         yield self.auth.get_user_by_req(request)
-        results = yield self.store.claim_e2e_one_time_keys(
-            [(user_id, device_id, algorithm)]
+        result = yield self.handle_request(
+            {"one_time_keys": {user_id: {device_id: algorithm}}}
         )
-        defer.returnValue(self.json_result(request, results))
+        defer.returnValue(result)
 
     @defer.inlineCallbacks
     def on_POST(self, request, user_id, device_id, algorithm):
@@ -252,14 +273,24 @@ class OneTimeKeyServlet(RestServlet):
             body = json.loads(request.content.read())
         except:
             raise SynapseError(400, "Invalid key JSON")
-        query = []
+        result = yield self.handle_request(body)
+        defer.returnValue(result)
+
+    @defer.inlineCallbacks
+    def handle_request(self, body):
+        local_query = []
+        remote_queries = {}
         for user_id, device_keys in body.get("one_time_keys", {}).items():
-            for device_id, algorithm in device_keys.items():
-                query.append((user_id, device_id, algorithm))
-        results = yield self.store.claim_e2e_one_time_keys(query)
-        defer.returnValue(self.json_result(request, results))
+            user = UserID.from_string(user_id)
+            if self.is_mine(user):
+                for device_id, algorithm in device_keys.items():
+                    local_query.append((user_id, device_id, algorithm))
+            else:
+                remote_queries.set_default(user.domain, {})[user_id] = (
+                    device_keys
+                )
+        results = yield self.store.claim_e2e_one_time_keys(local_query)
 
-    def json_result(self, request, results):
         json_result = {}
         for user_id, device_keys in results.items():
             for device_id, keys in device_keys.items():
@@ -267,7 +298,16 @@ class OneTimeKeyServlet(RestServlet):
                     json_result.setdefault(user_id, {})[device_id] = {
                         key_id: json.loads(json_bytes)
                     }
-        return (200, {"one_time_keys": json_result})
+
+        for destination, device_keys in remote_queries.items():
+            remote_result = yield self.federation.query_client_keys(
+                destination, {"one_time_keys": device_keys}
+            )
+            for user_id, keys in remote_result.items():
+                if user_id in device_keys:
+                    json_result[user_id] = keys
+
+        defer.returnValue((200, {"one_time_keys": json_result}))
 
 
 def register_servlets(hs, http_server):