Always allow the empty string as an avatar_url. (#12261)

Hopefully this fixes #12257.

Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/tests/handlers/test_profile.py b/tests/handlers/test_profile.py
index 08733a9f2d..1ec105c373 100644
--- a/tests/handlers/test_profile.py
+++ b/tests/handlers/test_profile.py
@@ -268,6 +268,12 @@ class ProfileTestCase(unittest.HomeserverTestCase):
         self.assertTrue(res)
 
     @unittest.override_config({"max_avatar_size": 50})
+    def test_avatar_constraints_allow_empty_avatar_url(self) -> None:
+        """An empty avatar is always permitted."""
+        res = self.get_success(self.handler.check_avatar_size_and_mime_type(""))
+        self.assertTrue(res)
+
+    @unittest.override_config({"max_avatar_size": 50})
     def test_avatar_constraints_missing(self) -> None:
         """Tests that an avatar isn't allowed if the file at the given MXC URI couldn't
         be found.
diff --git a/tests/rest/admin/test_user.py b/tests/rest/admin/test_user.py
index a60ea0a563..bef911d5df 100644
--- a/tests/rest/admin/test_user.py
+++ b/tests/rest/admin/test_user.py
@@ -1050,6 +1050,25 @@ class DeactivateAccountTestCase(unittest.HomeserverTestCase):
 
         self._is_erased("@user:test", True)
 
+    @override_config({"max_avatar_size": 1234})
+    def test_deactivate_user_erase_true_avatar_nonnull_but_empty(self) -> None:
+        """Check we can erase a user whose avatar is the empty string.
+
+        Reproduces #12257.
+        """
+        # Patch `self.other_user` to have an empty string as their avatar.
+        self.get_success(self.store.set_profile_avatar_url("user", ""))
+
+        # Check we can still erase them.
+        channel = self.make_request(
+            "POST",
+            self.url,
+            access_token=self.admin_user_tok,
+            content={"erase": True},
+        )
+        self.assertEqual(HTTPStatus.OK, channel.code, msg=channel.json_body)
+        self._is_erased("@user:test", True)
+
     def test_deactivate_user_erase_false(self) -> None:
         """
         Test deactivating a user and set `erase` to `false`