Factor out an is_mine_server_name method (#15542)

Add an `is_mine_server_name` method, similar to `is_mine_id`.

Ideally we would use this consistently, instead of sometimes comparing
against `hs.hostname` and other times reaching into
`hs.config.server.server_name`.

Also fix a bug in the tests where `hs.hostname` would sometimes differ
from `hs.config.server.server_name`.

Signed-off-by: Sean Quah <seanq@matrix.org>

changelog.d/15542.misc

@@ -0,0 +1 @@
+Factor out an `is_mine_server_name` method.

synapse/api/auth_blocking.py

@@ -39,7 +39,7 @@ def __init__(self, hs: "HomeServer"):
         self._mau_limits_reserved_threepids = (
             hs.config.server.mau_limits_reserved_threepids
         )
-        self._server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
         self._track_appservice_user_ips = hs.config.appservice.track_appservice_user_ips
 
     async def check_auth_blocking(
@@ -77,7 +77,7 @@ async def check_auth_blocking(
         if requester:
             if requester.authenticated_entity.startswith("@"):
                 user_id = requester.authenticated_entity
-            elif requester.authenticated_entity == self._server_name:
+            elif self._is_mine_server_name(requester.authenticated_entity):
                 # We never block the server from doing actions on behalf of
                 # users.
                 return

synapse/crypto/keyring.py

@@ -173,7 +173,7 @@ def __init__(
             process_batch_callback=self._inner_fetch_key_requests,
         )
 
-        self._hostname = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
 
         # build a FetchKeyResult for each of our own keys, to shortcircuit the
         # fetcher.
@@ -277,7 +277,7 @@ async def process_request(self, verify_request: VerifyJsonRequest) -> None:
 
         # If we are the originating server, short-circuit the key-fetch for any keys
         # we already have
-        if verify_request.server_name == self._hostname:
+        if self._is_mine_server_name(verify_request.server_name):
             for key_id in verify_request.key_ids:
                 if key_id in self._local_verify_keys:
                     found_keys[key_id] = self._local_verify_keys[key_id]

synapse/federation/federation_base.py

@@ -49,7 +49,7 @@ class FederationBase:
     def __init__(self, hs: "HomeServer"):
         self.hs = hs
 
-        self.server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
         self.keyring = hs.get_keyring()
         self._spam_checker_module_callbacks = hs.get_module_api_callbacks().spam_checker
         self.store = hs.get_datastores().main

synapse/federation/federation_client.py

@@ -854,7 +854,7 @@ async def _try_destination_list(
 
         for destination in destinations:
             # We don't want to ask our own server for information we don't have
-            if destination == self.server_name:
+            if self._is_mine_server_name(destination):
                 continue
 
             try:
@@ -1536,7 +1536,7 @@ async def forward_third_party_invite(
         self, destinations: Iterable[str], room_id: str, event_dict: JsonDict
     ) -> None:
         for destination in destinations:
-            if destination == self.server_name:
+            if self._is_mine_server_name(destination):
                 continue
 
             try:

synapse/federation/federation_server.py

@@ -129,6 +129,7 @@ class FederationServer(FederationBase):
     def __init__(self, hs: "HomeServer"):
         super().__init__(hs)
 
+        self.server_name = hs.hostname
         self.handler = hs.get_federation_handler()
         self._spam_checker_module_callbacks = hs.get_module_api_callbacks().spam_checker
         self._federation_event_handler = hs.get_federation_event_handler()
@@ -942,7 +943,7 @@ async def _on_send_membership_event(
             authorising_server = get_domain_from_id(
                 event.content[EventContentFields.AUTHORISING_USER]
             )
-            if authorising_server != self.server_name:
+            if not self._is_mine_server_name(authorising_server):
                 raise SynapseError(
                     400,
                     f"Cannot authorise request from resident server: {authorising_server}",

synapse/federation/send_queue.py

@@ -68,6 +68,7 @@ def __init__(self, hs: "HomeServer"):
         self.clock = hs.get_clock()
         self.notifier = hs.get_notifier()
         self.is_mine_id = hs.is_mine_id
+        self.is_mine_server_name = hs.is_mine_server_name
 
         # We may have multiple federation sender instances, so we need to track
         # their positions separately.
@@ -198,7 +199,7 @@ def build_and_send_edu(
         key: Optional[Hashable] = None,
     ) -> None:
         """As per FederationSender"""
-        if destination == self.server_name:
+        if self.is_mine_server_name(destination):
             logger.info("Not sending EDU to ourselves")
             return
 

synapse/federation/sender/__init__.py

@@ -362,6 +362,7 @@ def __init__(self, hs: "HomeServer"):
 
         self.clock = hs.get_clock()
         self.is_mine_id = hs.is_mine_id
+        self.is_mine_server_name = hs.is_mine_server_name
 
         self._presence_router: Optional["PresenceRouter"] = None
         self._transaction_manager = TransactionManager(hs)
@@ -766,7 +767,7 @@ async def send_read_receipt(self, receipt: ReadReceipt) -> None:
         domains = [
             d
             for d in domains_set
-            if d != self.server_name
+            if not self.is_mine_server_name(d)
             and self._federation_shard_config.should_handle(self._instance_name, d)
         ]
         if not domains:
@@ -832,7 +833,7 @@ def send_presence_to_destinations(
             assert self.is_mine_id(state.user_id)
 
         for destination in destinations:
-            if destination == self.server_name:
+            if self.is_mine_server_name(destination):
                 continue
             if not self._federation_shard_config.should_handle(
                 self._instance_name, destination
@@ -860,7 +861,7 @@ def build_and_send_edu(
             content: content of EDU
             key: clobbering key for this edu
         """
-        if destination == self.server_name:
+        if self.is_mine_server_name(destination):
             logger.info("Not sending EDU to ourselves")
             return
 
@@ -897,7 +898,7 @@ def send_edu(self, edu: Edu, key: Optional[Hashable]) -> None:
             queue.send_edu(edu)
 
     def send_device_messages(self, destination: str, immediate: bool = True) -> None:
-        if destination == self.server_name:
+        if self.is_mine_server_name(destination):
             logger.warning("Not sending device update to ourselves")
             return
 
@@ -919,7 +920,7 @@ def wake_destination(self, destination: str) -> None:
         might have come back.
         """
 
-        if destination == self.server_name:
+        if self.is_mine_server_name(destination):
             logger.warning("Not waking up ourselves")
             return
 

synapse/federation/transport/client.py

@@ -58,9 +58,9 @@ class TransportLayerClient:
     """Sends federation HTTP requests to other servers"""
 
     def __init__(self, hs: "HomeServer"):
-        self.server_name = hs.hostname
         self.client = hs.get_federation_http_client()
         self._faster_joins_enabled = hs.config.experimental.faster_joins_enabled
+        self._is_mine_server_name = hs.is_mine_server_name
 
     async def get_room_state_ids(
         self, destination: str, room_id: str, event_id: str
@@ -235,7 +235,7 @@ async def send_transaction(
             transaction.transaction_id,
         )
 
-        if transaction.destination == self.server_name:
+        if self._is_mine_server_name(transaction.destination):
             raise RuntimeError("Transport layer cannot send to itself!")
 
         # FIXME: This is only used by the tests. The actual json sent is

synapse/federation/transport/server/_base.py

@@ -57,6 +57,7 @@ def __init__(self, hs: "HomeServer"):
         self._clock = hs.get_clock()
         self.keyring = hs.get_keyring()
         self.server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
         self.store = hs.get_datastores().main
         self.federation_domain_whitelist = (
             hs.config.federation.federation_domain_whitelist
@@ -100,7 +101,9 @@ async def authenticate_request(
                 json_request["signatures"].setdefault(origin, {})[key] = sig
 
                 # if the origin_server sent a destination along it needs to match our own server_name
-                if destination is not None and destination != self.server_name:
+                if destination is not None and not self._is_mine_server_name(
+                    destination
+                ):
                     raise AuthenticationError(
                         HTTPStatus.UNAUTHORIZED,
                         "Destination mismatch in auth header",

synapse/handlers/event_auth.py

@@ -29,7 +29,7 @@
 )
 from synapse.events import EventBase
 from synapse.events.builder import EventBuilder
-from synapse.types import StateMap, StrCollection, get_domain_from_id
+from synapse.types import StateMap, StrCollection
 
 if TYPE_CHECKING:
     from synapse.server import HomeServer
@@ -47,6 +47,7 @@ def __init__(self, hs: "HomeServer"):
         self._store = hs.get_datastores().main
         self._state_storage_controller = hs.get_storage_controllers().state
         self._server_name = hs.hostname
+        self._is_mine_id = hs.is_mine_id
 
     async def check_auth_rules_from_context(
         self,
@@ -247,7 +248,7 @@ async def check_restricted_join_rules(
         if not await self.is_user_in_rooms(allowed_rooms, user_id):
             # If this is a remote request, the user might be in an allowed room
             # that we do not know about.
-            if get_domain_from_id(user_id) != self._server_name:
+            if not self._is_mine_id(user_id):
                 for room_id in allowed_rooms:
                     if not await self._store.is_host_joined(room_id, self._server_name):
                         raise SynapseError(

synapse/handlers/federation.py

@@ -141,6 +141,7 @@ def __init__(self, hs: "HomeServer"):
         self.server_name = hs.hostname
         self.keyring = hs.get_keyring()
         self.is_mine_id = hs.is_mine_id
+        self.is_mine_server_name = hs.is_mine_server_name
         self._spam_checker_module_callbacks = hs.get_module_api_callbacks().spam_checker
         self.event_creation_handler = hs.get_event_creation_handler()
         self.event_builder_factory = hs.get_event_builder_factory()
@@ -453,7 +454,7 @@ async def try_backfill(domains: StrCollection) -> bool:
 
             for dom in domains:
                 # We don't want to ask our own server for information we don't have
-                if dom == self.server_name:
+                if self.is_mine_server_name(dom):
                     continue
 
                 try:

synapse/handlers/federation_event.py

@@ -163,6 +163,7 @@ def __init__(self, hs: "HomeServer"):
         self._notifier = hs.get_notifier()
 
         self._is_mine_id = hs.is_mine_id
+        self._is_mine_server_name = hs.is_mine_server_name
         self._server_name = hs.hostname
         self._instance_name = hs.get_instance_name()
 
@@ -688,7 +689,7 @@ async def backfill(
         server from invalid events (there is probably no point in trying to
         re-fetch invalid events from every other HS in the room.)
         """
-        if dest == self._server_name:
+        if self._is_mine_server_name(dest):
             raise SynapseError(400, "Can't backfill from self.")
 
         events = await self._federation_client.backfill(

synapse/handlers/profile.py

@@ -59,7 +59,7 @@ def __init__(self, hs: "HomeServer"):
         self.max_avatar_size = hs.config.server.max_avatar_size
         self.allowed_avatar_mimetypes = hs.config.server.allowed_avatar_mimetypes
 
-        self.server_name = hs.config.server.server_name
+        self._is_mine_server_name = hs.is_mine_server_name
 
         self._third_party_rules = hs.get_module_api_callbacks().third_party_event_rules
 
@@ -309,7 +309,7 @@ async def check_avatar_size_and_mime_type(self, mxc: str) -> bool:
         else:
             server_name = host
 
-        if server_name == self.server_name:
+        if self._is_mine_server_name(server_name):
             media_info = await self.store.get_local_media(media_id)
         else:
             media_info = await self.store.get_cached_remote_media(server_name, media_id)

synapse/handlers/sso.py

@@ -194,6 +194,7 @@ def __init__(self, hs: "HomeServer"):
         self._clock = hs.get_clock()
         self._store = hs.get_datastores().main
         self._server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
         self._registration_handler = hs.get_registration_handler()
         self._auth_handler = hs.get_auth_handler()
         self._device_handler = hs.get_device_handler()
@@ -802,7 +803,7 @@ def is_allowed_mime_type(content_type: str) -> bool:
             if profile["avatar_url"] is not None:
                 server_name = profile["avatar_url"].split("/")[-2]
                 media_id = profile["avatar_url"].split("/")[-1]
-                if server_name == self._server_name:
+                if self._is_mine_server_name(server_name):
                     media = await self._media_repo.store.get_local_media(media_id)
                     if media is not None and upload_name == media["upload_name"]:
                         logger.info("skipping saving the user avatar")

synapse/handlers/typing.py

@@ -68,6 +68,7 @@ def __init__(self, hs: "HomeServer"):
         self.server_name = hs.config.server.server_name
         self.clock = hs.get_clock()
         self.is_mine_id = hs.is_mine_id
+        self.is_mine_server_name = hs.is_mine_server_name
 
         self.federation = None
         if hs.should_send_federation():
@@ -153,7 +154,7 @@ async def _push_remote(self, member: RoomMember, typing: bool) -> None:
                 member.room_id
             )
             for domain in hosts:
-                if domain != self.server_name:
+                if not self.is_mine_server_name(domain):
                     logger.debug("sending typing update to %s", domain)
                     self.federation.build_and_send_edu(
                         destination=domain,

synapse/rest/admin/media.py

@@ -258,15 +258,15 @@ class DeleteMediaByID(RestServlet):
     def __init__(self, hs: "HomeServer"):
         self.store = hs.get_datastores().main
         self.auth = hs.get_auth()
-        self.server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
         self.media_repository = hs.get_media_repository()
 
     async def on_DELETE(
         self, request: SynapseRequest, server_name: str, media_id: str
     ) -> Tuple[int, JsonDict]:
         await assert_requester_is_admin(self.auth, request)
 
-        if self.server_name != server_name:
+        if not self._is_mine_server_name(server_name):
             raise SynapseError(HTTPStatus.BAD_REQUEST, "Can only delete local media")
 
         if await self.store.get_local_media(media_id) is None:

synapse/rest/client/room.py

@@ -501,7 +501,7 @@ async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
             limit = None
 
         handler = self.hs.get_room_list_handler()
-        if server and server != self.hs.config.server.server_name:
+        if server and not self.hs.is_mine_server_name(server):
             # Ensure the server is valid.
             try:
                 parse_and_validate_server_name(server)
@@ -551,7 +551,7 @@ async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
             limit = None
 
         handler = self.hs.get_room_list_handler()
-        if server and server != self.hs.config.server.server_name:
+        if server and not self.hs.is_mine_server_name(server):
             # Ensure the server is valid.
             try:
                 parse_and_validate_server_name(server)

synapse/rest/media/download_resource.py

@@ -37,7 +37,7 @@ class DownloadResource(DirectServeJsonResource):
     def __init__(self, hs: "HomeServer", media_repo: "MediaRepository"):
         super().__init__()
         self.media_repo = media_repo
-        self.server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
 
     async def _async_render_GET(self, request: SynapseRequest) -> None:
         set_cors_headers(request)
@@ -59,7 +59,7 @@ async def _async_render_GET(self, request: SynapseRequest) -> None:
             b"no-referrer",
         )
         server_name, media_id, name = parse_media_id(request)
-        if server_name == self.server_name:
+        if self._is_mine_server_name(server_name):
             await self.media_repo.get_local_media(request, media_id, name)
         else:
             allow_remote = parse_boolean(request, "allow_remote", default=True)

synapse/rest/media/thumbnail_resource.py

@@ -59,7 +59,7 @@ def __init__(
         self.media_repo = media_repo
         self.media_storage = media_storage
         self.dynamic_thumbnails = hs.config.media.dynamic_thumbnails
-        self.server_name = hs.hostname
+        self._is_mine_server_name = hs.is_mine_server_name
 
     async def _async_render_GET(self, request: SynapseRequest) -> None:
         set_cors_headers(request)
@@ -71,7 +71,7 @@ async def _async_render_GET(self, request: SynapseRequest) -> None:
         # TODO Parse the Accept header to get an prioritised list of thumbnail types.
         m_type = "image/png"
 
-        if server_name == self.server_name:
+        if self._is_mine_server_name(server_name):
             if self.dynamic_thumbnails:
                 await self._select_or_generate_local_thumbnail(
                     request, media_id, width, height, method, m_type

synapse/server.py

@@ -377,6 +377,10 @@ def is_mine_id(self, string: str) -> bool:
             return False
         return localpart_hostname[1] == self.hostname
 
+    def is_mine_server_name(self, server_name: str) -> bool:
+        """Determines whether a server name refers to this homeserver."""
+        return server_name == self.hostname
+
     @cache_in_self
     def get_clock(self) -> Clock:
         return Clock(self._reactor)

synapse/storage/databases/main/room.py

@@ -996,7 +996,7 @@ async def quarantine_media_by_id(
                 If it is `None` media will be removed from quarantine
         """
         logger.info("Quarantining media: %s/%s", server_name, media_id)
-        is_local = server_name == self.config.server.server_name
+        is_local = self.hs.is_mine_server_name(server_name)
 
         def _quarantine_media_by_id_txn(txn: LoggingTransaction) -> int:
             local_mxcs = [media_id] if is_local else []