This implements media-repo-proxy, a lil' bit of Go to make our
infrastructure work with matrix-media-repo's concept of Host headers.
For some reason, MMR really wants Host: hackerspace.pl instead of Host:
matrix.hackerspace.pl. We'd fix that in their code, but with no tests
and with complex config reload logic it looks very daunting. We'd just
fix that in our Ingress, but that's not easy (no per-rule host
overrides).
So, we commit a tiny little itty bitty war crime and implement a piece
of Go code that serves as a rewriter for this.
This works, tested on boston:
$ curl -H "Host: matrix.hackerspace.pl" 10.10.12.46:8080/_matrix/media/r0/download/hackerspace.pl/EwVBulPgCWDWNGMKjcOKGGbk | file -
/dev/stdin: JPEG image data, JFIF standard 1.01, aspect ratio, density 1x1, segment length 16, baseline, precision 8, 650x300, components 3
(this address is media-repo.matrix.svc.k0.hswaw.net)
But hey, at least it has tests.
Change-Id: Ib6af1988fe8e112c9f3a5577506b18b48d80af62
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1143
Reviewed-by: q3k <q3k@hackerspace.pl>
