OSIN is an OAuth2 server library for the Go language, as specified at https://tools.ietf.org/html/rfc6749 and https://tools.ietf.org/html/draft-ietf-oauth-v2-10.

Using it, you can build your own OAuth2 authentication service.

The library implements the majority of the specification, like authorization and token endpoints, and authorization code, implicit, resource owner and client credentials grant types.

import "github.com/RangelReale/osin"

// TestStorage implements the "osin.Storage" interface
server := osin.NewServer(osin.NewServerConfig(), &TestStorage{})

// Authorization code endpoint
http.HandleFunc("/authorize", func(w http.ResponseWriter, r *http.Request) {
	resp := server.NewResponse()
	defer resp.Close()

	if ar := server.HandleAuthorizeRequest(resp, r); ar != nil {

		// HANDLE LOGIN PAGE HERE

		ar.Authorized = true
		server.FinishAuthorizeRequest(resp, r, ar)
	}
	osin.OutputJSON(resp, w, r)
})

// Access token endpoint
http.HandleFunc("/token", func(w http.ResponseWriter, r *http.Request) {
	resp := server.NewResponse()
	defer resp.Close()

	if ar := server.HandleAccessRequest(resp, r); ar != nil {
		ar.Authorized = true
		server.FinishAccessRequest(resp, r, ar)
	}
	osin.OutputJSON(resp, w, r)
})

http.ListenAndServe(":14000", nil)

Open in your web browser:

https://localhost:14000/authorize?response_type=code&client_id=1234&redirect_uri=http%3A%2F%2Flocalhost%3A14000%2Fappauth%2Fcode

The code is licensed using "New BSD" license.

Rangel Reale [email protected]

• BREAKING CHANGES:

  • Storage interface has 2 new methods, Clone and Close, to better support storages that need to clone / close in each connection (mgo)

  • Client was changed to be an interface instead of an struct. Because of that, the Storage interface also had to change, as interface is already a pointer.

  • HOW TO FIX YOUR CODE:

    • In your Storage, add a Clone function returning itself, and a do nothing Close.

    • In your Storage, replace all *osin.Client with osin.Client (remove the pointer reference)

    • If you used the osin.Client struct directly in your code, change it to osin.DefaultClient, which is a struct with the same fields that implements the interface.

    • Change all accesses using osin.Client to use the methods instead of the fields directly.

    • You MUST defer Response.Close in all your http handlers, otherwise some Storages may not clean correctly.

        resp := server.NewResponse()
        defer resp.Close()