Fixes https://github.com/turt2live/matrix-media-repo/issues/168

Fixes https://github.com/turt2live/matrix-media-repo/issues/167

Fixes https://github.com/turt2live/matrix-media-repo/issues/166

Validate certificates as per Matrix 1.0

Fixes https://github.com/turt2live/matrix-media-repo/issues/137

See https://matrix.org/blog/2019/05/24/final-countdown-to-1-0

Fix tempfile handling for SVG thumbnailing

See ce7259f1

See https://github.com/matrix-org/synapse/issues/4242 for some information - we were previously vulnerable to the short TTL problem. If someone were to take sufficient control of DNS, they could trick us into doing requests to a blacklisted host.

This also fixes a vulnerability where OpenGraph images were not passed through the same validation rules.

See https://github.com/matrix-org/synapse/pull/5134

It doesn't work

Fixes #150

Fixes https://github.com/turt2live/matrix-media-repo/issues/134

This can cause a panic of the process under the right conditions

There's a race condition where a stream might not be available if the media is remote and being downloaded. After a couple download attempts, it fixes itself. This will acquire a media stream if one isn't provided to ensure that a stream is always available to the consumer.

Fixes https://github.com/turt2live/matrix-media-repo/issues/142

Might be a fix for https://github.com/turt2live/matrix-media-repo/issues/92