libsignal VS signald

I am in the process of building a Go implementation of the libsignal-protocol, which powers the Signal app.

How is twitter intending to use libsignal? I doubt it would be via the primary AGPL license[1], forcing them to publish the source code of their server source code. Does signal sell private licenses?

[1] https://github.com/signalapp/libsignal/blob/main/LICENSE

The Signal Protocol is licensed under AGPLv3 (see here).

Signal protocol is AGPL3 https://github.com/signalapp/libsignal

This is the license for libsignal: https://github.com/signalapp/libsignal/blob/main/LICENSE

The only reference to trademark is:

> Notwithstanding any other provision of this License, for material you add to a covered work, you may (if authorized by the copyright holders of that material) supplement the terms of this License with terms:

Signald : https://gitlab.com/signald/signald/-/issues/259

This is neat.

I looked at the install instructions ("from source") and i while there were instructions, there was no download link for the tarball or even the git repository.

You have to click on the "gitlab" widget that shows the number of stars on the start page to get to the gitlab repository at https://gitlab.com/signald/signald

I've been using Signald for the last few months and then bridging it to Matrix. I think building exactly the same thing based off the Rust client is the most compelling option (and probably something I'd be interested in working on as well!). Given that a double-puppeted Signal account can be used with Matrix today, it'd be a shame to invest in Signal-specific UI. There are multiple "nearly there" Matrix clients that can work on the pinephone and others. You could even bridge libpurple to Matrix if you're into that ecosystem.

As Signal does not have a real API, it uses signald for communication with Signals server, which is also open source: https://gitlab.com/signald/signald

It looks like you just need a client that uses https://gitlab.com/signald/signald, and the matrix-signal bridge /u/anakinfredo posted is one of them.

When I wanted to use Signal on my PinePhone and realized how restrictive Signal was in a lot of ways I started looking at Matrix. Matrix feels a lot more like what chat "should" be, if it weren't for reality - there's an existing Java client (https://gitlab.com/signald/signald) that I've used for a few weeks and been impressed with. Now I bridge my Signal account to Matrix as the first step towards migrating away.