Use native upload when relaying from discord

[yousefmansy1]

Add option for using a native upload when relaying from discord.
Resolves #1965

[discord]
	[discord.maps]
		Server="xxxxxxxxxxxxxxxxxxxxxxxxxx"
		Token="xxxxxxxxxxxxxxxxxxxxxxxxxx"
		RemoteNickFormat="{NICK}\n"
		AutoWebhooks=true
		UseLocalAvatar=["telegram.bot"]
		PreserveThreading=true
		UseNativeUpload=true # ! new

[qaisjp]

I think this behaviour should be non-configurable (i.e. just the default behaviour) for any bridges where it's possible. I can't think of a good use-cases for some people wanting external links, and others not wanting external links.

[qaisjp]

(We can always add a setting later on if someone really wants it. Otherwise I don't think it's worth supporting an extra code path here.)

[yousefmansy1]

The reason why I had it configurable is because according to the documentation in the wiki a public link is preferable (referenced in the my issue #1965).

For most platforms this actually isn't possible (without using the media server)
Discord is unique in this regard.

So we'd be betraying that "standard" by making it non configurable.

Personally, I'm fine with making it the default discord behavior but it's up to the maintainers/community if that's the route we take.

[qaisjp]

my bad, i missed that part of the documentation. i will post a comment on your issue to help inform the spec for this pull request

[yousefmansy1]

So I updated the CR to not make it an option, should drop the commit for that change?

[yousefmansy1]

So I updated the CR to not make it an option, should drop the commit for that change?

@42wim what do you think?

[codeclimate]

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[yousefmansy1]

@42wim I think I fixed the golangci-lint issues, also squashed the commits into 1.

I removed the error return from the handle download because in reality there isn't really much we can do about it other than log it.

[oizyumov]

@42wim could you please look into this PR?

Seems like a little lines of code, yet a worthy update to a matterbridge :)

[jtrees]

Thanks! This is really cool. I've applied the patch and it seems to work... kind of.

The image gets rendered correctly in Element Web and Element Android but not in Cinny. There it just looks like a regular downloadable attachment.

I presume the issue is a missing mimetype field. A working image looks like this for me:

{
  "content": {
    "body": "foo.jpeg",
    "info": {
      "h": 512,
      "mimetype": "image/jpeg",
      "size": 1337,
      "w": 512,
      "xyz.amorgan.blurhash": "..."
    },
    "msgtype": "m.image",
    "url": "mxc://matrix.org/blablabla"
  },
  // ...
}

The message from Matterbridge looks like this though:

{
  "content": {
    "body": "foo.jpeg",
    "info": {
      "thumbnail_info": {}
    },
    "msgtype": "m.image",
    "url": "mxc://matrix.org/blablabla"
  },
  // ...
}