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MSC3860: Media Download Redirects #3860

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Merged
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May 9, 2023
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MSC3860: Media Download Redirects #3860

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ce59930
Add media download redirect proposal
Fizzadar Aug 4, 2022
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Add note about MSC proposal and implementation work
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Rework to be opt-in via query param
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sumnerevans Mar 29, 2023
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Clarify security considerations
sumnerevans Mar 29, 2023
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Clarify that unstable prefix should be used
sumnerevans Mar 30, 2023
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Add 308 status code for redirects
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Add clarification about no/false redirect param
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Add link to current spec media endpoints
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Add note about additional benefit of not proxying untrusted homeserve…
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Expand issues section to cover possible homeserver abuse
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fix a typo
anoadragon453 May 4, 2023
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20 changes: 20 additions & 0 deletions proposals/3860-media-download-redirect.md
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# MSC3860: Media Download Redirects

Currently the media download endpoints must return either a 200 with content or error responses. This
means the media server instance must stream the data from wherever it is stored, which is likely not
local to itself. Allowing redirects on these endpoints would make it possible for the media repo to
tell clients/servers to pull data direct from the source, eg. a CDN.

## Proposal

This MSC simply proposes that a 307 redirect code is allowed and followed according to the `Location`
header. It is possible some clients would already follow these which needs to be confirmed. Specifc
endpoints in question:

+ `/_matrix/media/v3/download/{serverName}/{mediaId}`
+ `/_matrix/media/v3/download/{serverName}/{mediaId}/{fileName}`
+ `/_matrix/media/v3/thumbnail/{serverName}/{mediaId}`

The media repo already conforms to standard HTTP practices so this may already work as expected. The
MSC is proposing to add redirects to the list of possible HTTP responses for the above endpoints in
the Matrix Specifiction. Implementation would be confirming that this works in all the major clients.