# OAuth2 for Go

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oauth2 package contains a client implementation for OAuth 2.0 spec.

## Installation

~~~~
go get golang.org/x/oauth2
~~~~

Or you can manually git clone the repository to
`$(go env GOPATH)/src/golang.org/x/oauth2`.

See godoc for further documentation and examples.

* [godoc.org/golang.org/x/oauth2](http://godoc.org/golang.org/x/oauth2)
* [godoc.org/golang.org/x/oauth2/google](http://godoc.org/golang.org/x/oauth2/google)


## App Engine

In change 96e89be (March 2015), we removed the `oauth2.Context2` type in favor
of the [`context.Context`](https://golang.org/x/net/context#Context) type from
the `golang.org/x/net/context` package. Later replaced by the standard `context` package
of the [`context.Context`](https://golang.org/pkg/context#Context) type.


This means it's no longer possible to use the "Classic App Engine"
`appengine.Context` type with the `oauth2` package. (You're using
Classic App Engine if you import the package `"appengine"`.)

To work around this, you may use the new `"google.golang.org/appengine"`
package. This package has almost the same API as the `"appengine"` package,
but it can be fetched with `go get` and used on "Managed VMs" and well as
Classic App Engine.

See the [new `appengine` package's readme](https://github.com/golang/appengine#updating-a-go-app-engine-app)
for information on updating your app.

If you don't want to update your entire app to use the new App Engine packages,
you may use both sets of packages in parallel, using only the new packages
with the `oauth2` package.

```go
import (
	"context"
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	newappengine "google.golang.org/appengine"
	newurlfetch "google.golang.org/appengine/urlfetch"

	"appengine"
)

func handler(w http.ResponseWriter, r *http.Request) {
	var c appengine.Context = appengine.NewContext(r)
	c.Infof("Logging a message with the old package")

	var ctx context.Context = newappengine.NewContext(r)
	client := &http.Client{
		Transport: &oauth2.Transport{
			Source: google.AppEngineTokenSource(ctx, "scope"),
			Base:   &newurlfetch.Transport{Context: ctx},
		},
	}
	client.Get("...")
}
```

## Policy for new packages

We no longer accept new provider-specific packages in this repo. For
defining provider endpoints and provider-specific OAuth2 behavior, we
encourage you to create packages elsewhere. We'll keep the existing
packages for compatibility.

## Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to
this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the oauth2 repository is located at
https://github.com/golang/oauth2/issues.
