go-webfinger

go-webfinger is a golang webfinger server implementation.

See v1.0 for the latest stable version -- you should fork from here if you'd like to use this in your own projects. Past v1.0, this libary is built particularly to support federation on WriteFreely / Write.as.

Usage

webfinger.Service is implemented as a net/http handler, which means usage is simply registering the object with your http service.

Using the webfinger service as the main ServeHTTP:

myResolver = ...
wf := webfinger.Default(myResolver{})
wf.NotFoundHandler = // the rest of your app
http.ListenAndService(":8080", wf)

Using the webfinger service as a route on an existing HTTP router:

myResolver = ...
wf := webfinger.Default(myResolver{})
http.Handle(webfinger.WebFingerPath, http.HandlerFunc(wf.Webfinger))
http.ListenAndService(":8080", nil)

Defaults

The webfinger service is installed with a few defaults. Some of these defaults ensure we stick closely to the webfinger specification (tls-only, CORS, Content-Type) and other defaults are simply useful for development (no-cache)

The full list of defaults can be found in the godoc for webfinger.Service. They are exposed as public variables which can be overriden.

PreHandlers are the list of preflight HTTP handlers to run. You can add your own via wf.PreHandlers["my-custom-name"] = ..., however, execution order is not guaranteed.

TLS-Only

Handler which routes to the TLS version of the page. Disable via wf.NoTLSHandler = nil.

No-Cache

A PreFlight handler which sets no-cache headers on anything under /.well-known/webfinger. Disable or override via wf.PreHandlers[webfinger.NoCacheMiddleware]

Content Type as application/jrd+json

A PreFlight handler which sets the Content-Type to application/jrd+json. Disable or override via wf.PreHandlers[webfinger.ContentTypeMiddleware].

CORS

A PreFlight handler which adds the CORS headers. Disable or override via wf.PreHandlers[webfinger.CorsMiddleware].

Credits

Thanks to @sheenobu for all the initial work on this library!