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Fix /messages
throwing a 500 when querying for non-existent room (#12683)
Fix https://github.com/matrix-org/synapse/issues/12678 Complement test added: https://github.com/matrix-org/complement/pull/369 **Before:** 500 internal server error **After:** According to the [spec](https://spec.matrix.org/latest/client-server-api/#get_matrixclientv3roomsroomidmessages), calling `/messages` against a non-existent `room_id` should throw a 403 forbidden (since you're not part of the room). This also matches the behavior before https://github.com/matrix-org/synapse/pull/12370 which regressed Synapse to the 500 behavior. ```json { "errcode": "M_FORBIDDEN", "error": "User @test:my.synapse.server not in room !dne:my.synapse.server, and room previews are disabled" } ```
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Fix a bug introduced in Synapse 1.57.0 where `/messages` would throw a 500 error when querying for a non-existent room.
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@ -448,7 +448,7 @@ class PaginationHandler:
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)
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# We expect `/messages` to use historic pagination tokens by default but
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# `/messages` should still works with live tokens when manually provided.
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assert from_token.room_key.topological
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assert from_token.room_key.topological is not None
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if pagin_config.limit is None:
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# This shouldn't happen as we've set a default limit before this
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@ -785,18 +785,10 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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return None
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async def get_current_room_stream_token_for_room_id(
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self, room_id: Optional[str] = None
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self, room_id: str
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) -> RoomStreamToken:
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"""Returns the current position of the rooms stream.
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By default, it returns a live token with the current global stream
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token. Specifying a `room_id` causes it to return a historic token with
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the room specific topological token.
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"""
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"""Returns the current position of the rooms stream (historic token)."""
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stream_ordering = self.get_room_max_stream_ordering()
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if room_id is None:
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return RoomStreamToken(None, stream_ordering)
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else:
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topo = await self.db_pool.runInteraction(
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"_get_max_topological_txn", self._get_max_topological_txn, room_id
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)
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@ -870,7 +862,11 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
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)
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rows = txn.fetchall()
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return rows[0][0] if rows else 0
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# An aggregate function like MAX() will always return one row per group
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# so we can safely rely on the lookup here. For example, when a we
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# lookup a `room_id` which does not exist, `rows` will look like
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# `[(None,)]`
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return rows[0][0] if rows[0][0] is not None else 0
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@staticmethod
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def _set_before_and_after(
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