Support for avatars/attachments when possible about matterbridge

[42wim]

At the moment the bridge are very generic, to do what you propose I'll need to add some kind of capability system to know what every bridge can support (beside just text).
Not committing to this, but I'll think about it.

File attachments are handled already btw, in the way that a download URL is posted.

[akhmerov]

BTW just verified that something goes wrong with attachments:

This is what I get with click + copy public link:
https://our.mattermost.server/api/v3/public/files/get/nh5rs8bpitrxtdr5juit3tdz4r/psbs9a5kmfga5biiho41eer5jy/hbwgxekk8inktn3beng4ewjr8r/oqtntdukobgo9fiwjda9syu8jr/Image Pasted at 2016-10-18 23-53.png?h=N4huqINVMkUc4BdL2ytW6R5-UHFd8qjZ68A9TC_QnFs

and this is what matterbridge wrote:
https://our.mattermost.server/api/v3/public/files/get/nh5rs8bpitrxtdr5juit3tdz4r/psbs9a5kmfga5biiho41eer5jy/hbwgxekk8inktn3beng4ewjr8r/oqtntdukobgo9fiwjda9syu8jr/Image%20Pasted%20at%202016-10-18%2023-53.png?h=kJm5rYTmtNz_t6qbsDw6q5C8jRbCyBboDLAtj1oCuIw

and it results in {"id":"api.file.get_file.public_invalid.app_error","message":"The public link does not appear to be valid","detailed_error":"","request_id":"bj5jdogatiytzdo1wujzohuq8h","status_code":400}

[42wim]

I can not reproduce this, works fine for me

[akhmerov]

Could it be a bug with mattermost lingering after several subsequent upgrades?

[akhmerov]

About the additional things that may be worth including in the bridge similarly to avatars:

• message editing (supported at least by slack, mattermost, and gitter).
• message responses (specific to mattermost I believe)

[42wim]

Message editing (and responses) should now be working.
They are sent as a normal message so every protocol is supported