Implement GET /device/{deviceId}

synapse/handlers/device.py

@@ -12,7 +12,8 @@
 # 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.api.errors import StoreError
+
+from synapse.api import errors
 from synapse.util import stringutils
 from twisted.internet import defer
 from ._base import BaseHandler
@@ -65,10 +66,10 @@ class DeviceHandler(BaseHandler):
                     ignore_if_known=False,
                 )
                 defer.returnValue(device_id)
-            except StoreError:
+            except errors.StoreError:
                 attempts += 1
 
-        raise StoreError(500, "Couldn't generate a device ID.")
+        raise errors.StoreError(500, "Couldn't generate a device ID.")
 
     @defer.inlineCallbacks
     def get_devices_by_user(self, user_id):
@@ -88,11 +89,38 @@ class DeviceHandler(BaseHandler):
             devices=((user_id, device_id) for device_id in devices.keys())
         )
 
-        for device_id in devices.keys():
-            ip = ips.get((user_id, device_id), {})
-            devices[device_id].update({
-                "last_seen_ts": ip.get("last_seen"),
-                "last_seen_ip": ip.get("ip"),
-            })
+        for device in devices.values():
+            _update_device_from_client_ips(device, ips)
 
         defer.returnValue(devices)
+
+    @defer.inlineCallbacks
+    def get_device(self, user_id, device_id):
+        """ Retrieve the given device
+
+        Args:
+            user_id (str):
+            device_id (str)
+
+        Returns:
+            defer.Deferred: dict[str, X]: info on the device
+        Raises:
+            errors.NotFoundError: if the device was not found
+        """
+        try:
+            device = yield self.store.get_device(user_id, device_id)
+        except errors.StoreError, e:
+            raise errors.NotFoundError
+        ips = yield self.store.get_last_client_ip_by_device(
+            devices=((user_id, device_id),)
+        )
+        _update_device_from_client_ips(device, ips)
+        defer.returnValue(device)
+
+
+def _update_device_from_client_ips(device, client_ips):
+    ip = client_ips.get((device["user_id"], device["device_id"]), {})
+    device.update({
+        "last_seen_ts": ip.get("last_seen"),
+        "last_seen_ip": ip.get("ip"),
+    })

synapse/rest/client/v2_alpha/devices.py

@@ -47,5 +47,30 @@ class DevicesRestServlet(RestServlet):
         defer.returnValue((200, {"devices": devices}))
 
 
+class DeviceRestServlet(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))
+
+
 def register_servlets(hs, http_server):
     DevicesRestServlet(hs).register(http_server)
+    DeviceRestServlet(hs).register(http_server)

tests/handlers/test_device.py

@@ -19,6 +19,8 @@ import synapse.handlers.device
 import synapse.storage
 from tests import unittest, utils
 
+user1 = "@boris:aaa"
+user2 = "@theresa:bbb"
 
 class DeviceTestCase(unittest.TestCase):
     def __init__(self, *args, **kwargs):
@@ -78,16 +80,7 @@ class DeviceTestCase(unittest.TestCase):
 
     @defer.inlineCallbacks
     def test_get_devices_by_user(self):
-        # check this works for both devices which have a recorded client_ip,
-        # and those which don't.
-        user1 = "@boris:aaa"
-        user2 = "@theresa:bbb"
-        yield self._record_user(user1, "xyz", "display 0")
-        yield self._record_user(user1, "fco", "display 1", "token1", "ip1")
-        yield self._record_user(user1, "abc", "display 2", "token2", "ip2")
-        yield self._record_user(user1, "abc", "display 2", "token3", "ip3")
-
-        yield self._record_user(user2, "def", "dispkay", "token4", "ip4")
+        yield self._record_users()
 
         res = yield self.handler.get_devices_by_user(user1)
         self.assertEqual(3, len(res.keys()))
@@ -113,6 +106,30 @@ class DeviceTestCase(unittest.TestCase):
             "last_seen_ts": 3000000,
         }, res["abc"])
 
+    @defer.inlineCallbacks
+    def test_get_device(self):
+        yield self._record_users()
+
+        res = yield self.handler.get_device(user1, "abc")
+        self.assertDictContainsSubset({
+            "user_id": user1,
+            "device_id": "abc",
+            "display_name": "display 2",
+            "last_seen_ip": "ip3",
+            "last_seen_ts": 3000000,
+        }, res)
+
+    @defer.inlineCallbacks
+    def _record_users(self):
+        # check this works for both devices which have a recorded client_ip,
+        # and those which don't.
+        yield self._record_user(user1, "xyz", "display 0")
+        yield self._record_user(user1, "fco", "display 1", "token1", "ip1")
+        yield self._record_user(user1, "abc", "display 2", "token2", "ip2")
+        yield self._record_user(user1, "abc", "display 2", "token3", "ip3")
+
+        yield self._record_user(user2, "def", "dispkay", "token4", "ip4")
+
     @defer.inlineCallbacks
     def _record_user(self, user_id, device_id, display_name,
                      access_token=None, ip=None):