Add Signal support

[andig]

There is currently no Go API but a package relying on signal-cli: https://github.com/bbernhard/signal-cli-rest-api

[simskij]

Interesting! Would need to read up on this as I've never heard about signal before. Would you mind providing some more details? 😄

[andig]

Wish I could... seems at this time there is really no Go implementation around. Started investigating in https://community.signalusers.org/t/go-client-library/17511. The actual project website is of course https://www.signal.org.

[piksel]

@simskij I think you have heard of Signal 😁

But yeah, using a CLI-wrapper seems to be cumbersome and I already had a shot at (and gave up) making a Signal client for other purposes and it was a bit too much work.

I'm not saying I won't accept a PR for a Signal service though, but it's not something I seem feasible to implement myself atm.

Useful resources:

• Go curve25519 lib from x
• protos
• java implementation

[andig]

Signal is kinda funny. It is sort of open source but seems to be pretty hard to approach.

[Knapoc]

Would it be possible to integrate Signal using signal-cli-rest-api?

I tried to send notifications via the generic webhook but it seems that I struggle to send a correct payload to it.

[piksel]

@Knapoc that looks really easy, but I guess the consumer would need to have such a container set up and configured for it to work, which generally isn't the smoothest user experience...

Perhaps I can add it as a generic example. The generic service should gain some additional powers pretty soon that should make this really easy...

[OnBartt]

Hi guys, how does it look with that generic-webhook-signal example? I am one of the people who has signal-rest-api contianer up and running. For example Dockge uses it as notification service and I also use it for some custom notificatons in my system. Any kind of support of signal in shoutrrr would be really nice. Thanks a lot guys.

[chrisswanda]

Another signal-rest-api user here. I've been banging rocks together all morning trying to see if I can get the generic web hook to play nicely with the signal-rest-api, but I guess my ham fisted skills are no match.

[dpmpc]

as I ran into the same issue: there is a now a hidden parameter recipient accepting a string (instead of an array) in the /v2/send endpoint provided by recent versions of the signal-cli-rest-api , see bbernhard/signal-cli-rest-api#428

So shoutrr could be used to send Signal messages to a single recipient (or to one group) using signal-cli-rest-api by using the following command :

./shoutrrr send -u 'generic://localhost:8080/v2/send?template=json&disabletls=yes&$number=%2B491111111&$recipient=%2B492222222'  -m Message -t Title