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-rw-r--r--changelog.d/3405.bugfix1
-rw-r--r--synapse/api/filtering.py11
2 files changed, 9 insertions, 3 deletions
diff --git a/changelog.d/3405.bugfix b/changelog.d/3405.bugfix
new file mode 100644
index 0000000000..27f5226b3d
--- /dev/null
+++ b/changelog.d/3405.bugfix
@@ -0,0 +1 @@
+Fix contains_url check to be consistent with other instances in code-base and check that value is an instance of string.
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index 677c0bdd4c..16ad654864 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -12,6 +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 six import text_type
+
 import jsonschema
 from canonicaljson import json
 from jsonschema import FormatChecker
@@ -353,7 +355,7 @@ class Filter(object):
             sender = event.user_id
             room_id = None
             ev_type = "m.presence"
-            is_url = False
+            contains_url = False
         else:
             sender = event.get("sender", None)
             if not sender:
@@ -368,13 +370,16 @@ class Filter(object):
 
             room_id = event.get("room_id", None)
             ev_type = event.get("type", None)
-            is_url = "url" in event.get("content", {})
+
+            content = event.get("content", {})
+            # check if there is a string url field in the content for filtering purposes
+            contains_url = isinstance(content.get("url"), text_type)
 
         return self.check_fields(
             room_id,
             sender,
             ev_type,
-            is_url,
+            contains_url,
         )
 
     def check_fields(self, room_id, sender, event_type, contains_url):