Add support for Apprise

[PiDroid-B]

Hello,

I use Watchtower and i like this amazing project !

To improve the management of migrations, i use Apprise as a "notification broker" then i can change all the end points at the same place (i.e. : migration of mattermost, add discord channel etc... without change it on each services).

I search about integration of Apprise in Watchtower and/or Shoutrrr and found this : #59

i like a lot if i can use Apprise as like as i can use Discord or Mattermost (or everything else in this page : https://containrrr.dev/shoutrrr/v0.5/services/overview/ )

There is a futur integration of Apprise with Shoutrrr ?

Thank's a lot !

[piksel]

Yeah, we should probably add an apprise provider that puts the content in the body field. You can already do it by using the generic service, but you would have to make a custom template payload, which makes it a lot harder to use.

[RichyHBM]

Has there been any more thought in this? Or any guides on how to achieve it using the generic method?

[piksel]

@RichyHBM No, not really. I have not had the time to look into it, my statement above is just from a technical stand, it should be possible to do using a custom template, but it would require some trial and error. You would need to create a custom template that matches the apprise JSON body, something like:

{
   "urls": {"pbul://apikey, mailto://user:pass@gmail.com"},
   "title": {"{{ .Title }}"},
   "body": {"{{range .Entries -}}{{.Message}}{{\"\n\"}}{{- end -}}"},
   "type": {"info"},
}

and using the shoutrrr URL: generic://apprise-api-hostname/notify/
(this is assuming you are using watchtower)

[simskij]

Has there been any more thought in this? Or any guides on how to achieve it using the generic method?

Feel free to have a stab at it if you want! 👍🏼

[TheFiZi]

Has there been any more thought in this? Or any guides on how to achieve it using the generic method?

A workaround for now based on this PR: #364

Set WATCHTOWER_NOTIFICATION_URL to: generic://[APPRISE FQDN]/notify/[CONFIG ID]?template=json&messagekey=body&title=title&tags=[YOUR TAG]

Example: generic://apprise.mydomain.com/notify/my_apprise_config_id?template=json&messagekey=body&title=title&tags=discord_notifications