Clarify that MSC3827 also affects federation endpoints #3858
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matrix-org/synapse#13031 originally added support for the feature to Synapse, which although doesn't include an obvious federation route it does end up sending the field over federation. [Here](https://github.com/matrix-org/synapse/blob/a6895dd576f96d7fd086fb4128d48ac8a3f098c5/synapse/federation/transport/client.py#L481) the server copies the search filter just before it goes over the wire, which is supplied by through a chain of function calls originating [here](https://github.com/matrix-org/synapse/blob/c6d617641186221829c644204f24654430858826/synapse/rest/client/room.py#L456). Additionally, it is clear that this sort of feature would have included federation given the filtering is able to be proxied directly like this (as demonstrated by Synapse above). As such, this is determined to be a clarification/minor edit to the MSC, not requiring a second MSC to add the functionality.
richvdh
approved these changes
Aug 4, 2022
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MSC: #3827
matrix-org/synapse#13031 originally added support for the feature to Synapse, which although doesn't include an obvious federation route it does end up sending the field over federation.
Here the server copies the search filter just before it goes over the wire, which is supplied by through a chain of function calls originating here.
Additionally, it is clear that this sort of feature would have included federation given the filtering is able to be proxied directly like this (as demonstrated by Synapse above).
As such, this is determined to be a clarification/minor edit to the MSC, not requiring a second MSC to add the functionality.