Add Syncthing Relay Server widget

[DevPGSV]

• Added Syncthing Relay Server widget

[JazzFisch]

Is genericProxyHandler the correct proxy to use? According to https://docs.syncthing.net/dev/rest.html, this API is secured via the X-API-Key header. Would credentialedProxyHandler not be a better choice?

[DevPGSV]

That link points to the Syncthing client documentation.
The service used here is the Syncthing Relay Server:

https://docs.syncthing.net/users/strelaysrv.html

The request is done to the address defined in:
--status-srv
That address only offers one endpoint: /status
That endpoint is public,it doesn't require authorization.
That endpoint is the one used by the following service:
https://relays.syncthing.net/

[benphelps]

I need an example widget entry, along with any details a user might need to know to get the widget hooked up, for the Wiki.

After that, I'll merge this in.

[benphelps]

I would suggest changing the last two stats to be just "Relayed" and "Rate", but I can do that after the merge, either way.

We try to keep them single words, since the translation is often much longer, but still needs to fit.

[DevPGSV]

The service configuration I am using:

    - Syncthing Relay Server:
        description: Syncthing Relay Server
        icon: syncthing
        server: [redacted]
        container: [redacted]
        widget:
            type: strelaysrv
            url: http://syncthing.librelabucm.org:22070

The command documentation is here: https://docs.syncthing.net/users/strelaysrv.html

We are currently running that Syncthing Relay Server by using: https://hub.docker.com/r/syncthing/relaysrv

Docker or not, the the flag "-status-srv=" defines the address for status endpoint with statistics. By default its value is :22070.
When run on a docker-compose, the flag can be set by using a custom entrypoint:

services:
  strelaysrv:
    image: syncthing/relaysrv:latest
    network_mode: "host"
    entrypoint: ["/bin/entrypoint.sh", "/bin/strelaysrv", "-listen=0.0.0.0:22067", "-ext-address=syncthing.librelabucm.org:22067", "-status-srv=syncthing.librelabucm.org:22070"]
   volumes:
      - ./volumes/strelaysrv:/var/strelaysrv
   ports:
      - 22067:22067
      - 22070:22070

The site https://relays.syncthing.net/ periodically queries the endpoint of known Syncthing Relay Servers to display the statistics.
To test the widget with other servers, choose any other server in the list of https://relays.syncthing.net/ , and set widget.url to the Address of the service. The port (usually :22067) displayed there is the port where the service runs. It has to be changed to :22070, the port where the statistics are available. In that port the statistics are shown at the endpoint /status.

For example, choosing from the list: 195.201.44.21:22067, we would have to set widget.url to http://195.201.44.21:22070.
With that, the widget will query: http://195.201.44.21:22070/status

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