[Galene] Re: coturn config

[Juliusz Chroboczek <jch@irif.fr>]

>> In Galène, authentication only happens when you join a group, so that
>> would mean communicating the ICE configuration together with the "joined"
>> message that carries the client's permissions.

> Yup, that makes sense!

I've made the protocol change in the master branch, and made it so the
TURN configuration can change at any time and Galène will notice within
5 minutes at most.  We're not changing the configuration of previously
joined clients yet, but the protocol could support it quite easily.

(We'd simply need to send a "type=joined, kind=change" message to all the
clients when we detect a change, and the clients will switch to the new
TURN credentials at the next ICE restart.)

> I look forward to your implementation :)

I've put an implementation into the branch "tokes-folly".  It's completely
untested, please let me know if it works.

I'm a little hesitant to merge it, since it is just as easily done by
writing a five-line Python or Lua script that fetches the new
configuration and dumps it into Galènes data directory.

-- Juliuszp