Add get_userinfo_by_id method to ModuleApi

changelog.d/9581.feature

@@ -0,0 +1 @@
+Add get_user_by_id method to ModuleApi.

synapse/module_api/__init__.py

@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
-from typing import TYPE_CHECKING, Any, Generator, Iterable, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Dict, Generator, Iterable, Optional, Tuple
 
 from twisted.internet import defer
 
@@ -72,6 +72,16 @@ def public_room_list_manager(self):
         """
         return self._public_room_list_manager
 
+    def get_user_by_id(self, user_id: str) -> Optional[Dict[str, Any]]:
+        """Get user by user_id
+
+        Args:
+            user_id: Fully qualified user id.
+        Returns:
+            the user dictionary or None if not found.
+        """
+        return self._store.get_user_by_id(user_id)
+
     def get_user_by_req(self, req, allow_guest=False):
         """Check the access_token provided for a request
 

tests/module_api/test_api.py

@@ -64,6 +64,11 @@ def test_can_register_user(self):
         displayname = self.get_success(self.store.get_profile_displayname("bob"))
         self.assertEqual(displayname, "Bobberino")
 
+    def test_get_user_by_id(self):
+        user_id = self.register_user("alice", "1234")
+        found_user = self.get_success(self.module_api.get_user_by_id(user_id))
+        self.assertTrue(found_user.get("name"), user_id)
+
     def test_sending_events_into_room(self):
         """Tests that a module can send events into a room"""
         # Mock out create_and_send_nonmember_event to check whether events are being sent