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Programming language: Go
Latest version: v1.0.1

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README

OSIN

GoDoc

Golang OAuth2 server library

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

It also includes support for PKCE, as specified at https://tools.ietf.org/html/rfc7636, which increases security for code-exchange flows for public OAuth clients.

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.

Example Server

import (
    "github.com/RangelReale/osin"
    ex "github.com/RangelReale/osin/example" 
)

// ex.NewTestStorage implements the "osin.Storage" interface
server := osin.NewServer(osin.NewServerConfig(), ex.NewTestStorage())

// 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)

Example Access

Open in your web browser:

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

Storage backends

There is a mock available at example/teststorage.go which you can use as a guide for writing your own.

You might want to check out other implementations for common database management systems as well:

License

The code is licensed using "New BSD" license.

Author

Rangel Reale rangelreale@gmail.com

Changes

2014-06-25

  • 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()
        


*Note that all licence references and agreements mentioned in the osin README section above are relevant to that project's source code only.