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-rw-r--r--changelog.d/7836.misc1
-rw-r--r--synapse/api/errors.py4
-rw-r--r--synapse/federation/federation_server.py2
-rw-r--r--synapse/handlers/ui_auth/checkers.py3
-rw-r--r--synapse/http/client.py4
-rw-r--r--synapse/http/servlet.py4
-rw-r--r--synapse/rest/client/v1/room.py13
-rw-r--r--synapse/rest/key/v2/remote_key_resource.py4
8 files changed, 22 insertions, 13 deletions
diff --git a/changelog.d/7836.misc b/changelog.d/7836.misc
new file mode 100644
index 0000000000..a3a97c7590
--- /dev/null
+++ b/changelog.d/7836.misc
@@ -0,0 +1 @@
+Ensure that calls to `json.dumps` are compatible with the standard library json.
diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index cc5edb5118..b3bab1aa52 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -15,12 +15,14 @@
 # limitations under the License.
 
 """Contains exceptions and error codes."""
-import json
+
 import logging
 import typing
 from http import HTTPStatus
 from typing import Dict, List, Optional, Union
 
+from canonicaljson import json
+
 from twisted.web import http
 
 if typing.TYPE_CHECKING:
diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index 2aab9c5f55..8c53330c49 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -14,10 +14,10 @@
 # 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 json
 import logging
 from typing import Any, Callable, Dict, List, Match, Optional, Tuple, Union
 
+from canonicaljson import json
 from prometheus_client import Counter, Histogram
 
 from twisted.internet import defer
diff --git a/synapse/handlers/ui_auth/checkers.py b/synapse/handlers/ui_auth/checkers.py
index 8b24a73319..a140e9391e 100644
--- a/synapse/handlers/ui_auth/checkers.py
+++ b/synapse/handlers/ui_auth/checkers.py
@@ -12,6 +12,7 @@
 # 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 canonicaljson import json
@@ -117,7 +118,7 @@ class RecaptchaAuthChecker(UserInteractiveAuthChecker):
         except PartialDownloadError as pde:
             # Twisted is silly
             data = pde.response
-            resp_body = json.loads(data)
+            resp_body = json.loads(data.decode("utf-8"))
 
         if "success" in resp_body:
             # Note that we do NOT check the hostname here: we explicitly
diff --git a/synapse/http/client.py b/synapse/http/client.py
index b80681135e..6bc51202cd 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -13,13 +13,13 @@
 # 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 json
+
 import logging
 import urllib
 from io import BytesIO
 
 import treq
-from canonicaljson import encode_canonical_json
+from canonicaljson import encode_canonical_json, json
 from netaddr import IPAddress
 from prometheus_client import Counter
 from zope.interface import implementer, provider
diff --git a/synapse/http/servlet.py b/synapse/http/servlet.py
index 3cabe9d02e..a34e5ead88 100644
--- a/synapse/http/servlet.py
+++ b/synapse/http/servlet.py
@@ -14,9 +14,11 @@
 # limitations under the License.
 
 """ This module contains base REST classes for constructing REST servlets. """
-import json
+
 import logging
 
+from canonicaljson import json
+
 from synapse.api.errors import Codes, SynapseError
 
 logger = logging.getLogger(__name__)
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index f40ed82142..ea5912d4e4 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -15,6 +15,7 @@
 # limitations under the License.
 
 """ This module contains REST servlets to do with rooms: /rooms/<paths> """
+
 import logging
 import re
 from typing import List, Optional
@@ -515,9 +516,9 @@ class RoomMessageListRestServlet(RestServlet):
         requester = await self.auth.get_user_by_req(request, allow_guest=True)
         pagination_config = PaginationConfig.from_request(request, default_limit=10)
         as_client_event = b"raw" not in request.args
-        filter_bytes = parse_string(request, b"filter", encoding=None)
-        if filter_bytes:
-            filter_json = urlparse.unquote(filter_bytes.decode("UTF-8"))
+        filter_str = parse_string(request, b"filter", encoding="utf-8")
+        if filter_str:
+            filter_json = urlparse.unquote(filter_str)
             event_filter = Filter(json.loads(filter_json))  # type: Optional[Filter]
             if (
                 event_filter
@@ -627,9 +628,9 @@ class RoomEventContextServlet(RestServlet):
         limit = parse_integer(request, "limit", default=10)
 
         # picking the API shape for symmetry with /messages
-        filter_bytes = parse_string(request, "filter")
-        if filter_bytes:
-            filter_json = urlparse.unquote(filter_bytes)
+        filter_str = parse_string(request, b"filter", encoding="utf-8")
+        if filter_str:
+            filter_json = urlparse.unquote(filter_str)
             event_filter = Filter(json.loads(filter_json))  # type: Optional[Filter]
         else:
             event_filter = None
diff --git a/synapse/rest/key/v2/remote_key_resource.py b/synapse/rest/key/v2/remote_key_resource.py
index e149ac1733..9b3f85b306 100644
--- a/synapse/rest/key/v2/remote_key_resource.py
+++ b/synapse/rest/key/v2/remote_key_resource.py
@@ -202,9 +202,11 @@ class RemoteKey(DirectServeJsonResource):
 
                 if miss:
                     cache_misses.setdefault(server_name, set()).add(key_id)
+                # Cast to bytes since postgresql returns a memoryview.
                 json_results.add(bytes(most_recent_result["key_json"]))
             else:
                 for ts_added, result in results:
+                    # Cast to bytes since postgresql returns a memoryview.
                     json_results.add(bytes(result["key_json"]))
 
         if cache_misses and query_remote_on_cache_miss:
@@ -213,7 +215,7 @@ class RemoteKey(DirectServeJsonResource):
         else:
             signed_keys = []
             for key_json in json_results:
-                key_json = json.loads(key_json)
+                key_json = json.loads(key_json.decode("utf-8"))
                 for signing_key in self.config.key_server_signing_keys:
                     key_json = sign_json(key_json, self.config.server_name, signing_key)