google

package
Version: v0.13.0 Latest Latest
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Published: May 29, 2015 License: BSD-3-Clause, Apache-2.0 Imports: 11 Imported by: 0

Documentation

Overview

Package google provides support for making OAuth2 authorized and authenticated HTTP requests to Google APIs. It supports Web server, client-side, service accounts, Google Compute Engine service accounts, and Google App Engine service accounts authorization and authentications flows:

For more information, please read https://developers.google.com/accounts/docs/OAuth2.

Example (ServiceAccount)
package main

import (
	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	"golang.org/x/oauth2/jwt"
)

func main() {
	// Your credentials should be obtained from the Google
	// Developer Console (https://console.developers.google.com).
	conf := &jwt.Config{
		Email: "xxx@developer.gserviceaccount.com",
		// The contents of your RSA private key or your PEM file
		// that contains a private key.
		// If you have a p12 file instead, you
		// can use `openssl` to export the private key into a pem file.
		//
		//    $ openssl pkcs12 -in key.p12 -passin pass:notasecret -out key.pem -nodes
		//
		// The field only supports PEM containers with no passphrase.
		// The openssl command will convert p12 keys to passphrase-less PEM containers.
		PrivateKey: []byte("-----BEGIN RSA PRIVATE KEY-----..."),
		Scopes: []string{
			"https://www.googleapis.com/auth/bigquery",
			"https://www.googleapis.com/auth/blogger",
		},
		TokenURL: google.JWTTokenURL,
		// If you would like to impersonate a user, you can
		// create a transport with a subject. The following GET
		// request will be made on the behalf of user@example.com.
		// Optional.
		Subject: "user@example.com",
	}
	// Initiate an http.Client, the following GET request will be
	// authorized and authenticated on the behalf of user@example.com.
	client := conf.Client(oauth2.NoContext)
	client.Get("...")
}
Output:

Example (WebServer)
package main

import (
	"fmt"
	"log"

	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
)

func main() {
	// Your credentials should be obtained from the Google
	// Developer Console (https://console.developers.google.com).
	conf := &oauth2.Config{
		ClientID:     "YOUR_CLIENT_ID",
		ClientSecret: "YOUR_CLIENT_SECRET",
		RedirectURL:  "YOUR_REDIRECT_URL",
		Scopes: []string{
			"https://www.googleapis.com/auth/bigquery",
			"https://www.googleapis.com/auth/blogger",
		},
		Endpoint: google.Endpoint,
	}
	// Redirect user to Google's consent page to ask for permission
	// for the scopes specified above.
	url := conf.AuthCodeURL("state")
	fmt.Printf("Visit the URL for the auth dialog: %v", url)

	// Handle the exchange code to initiate a transport.
	tok, err := conf.Exchange(oauth2.NoContext, "authorization-code")
	if err != nil {
		log.Fatal(err)
	}
	client := conf.Client(oauth2.NoContext, tok)
	client.Get("...")
}
Output:

Index

Examples

Constants

View Source
const JWTTokenURL = "https://accounts.google.com/o/oauth2/token"

JWTTokenURL is Google's OAuth 2.0 token URL to use with the JWT flow.

Variables

View Source
var Endpoint = oauth2.Endpoint{
	AuthURL:  "https://accounts.google.com/o/oauth2/auth",
	TokenURL: "https://accounts.google.com/o/oauth2/token",
}

Endpoint is Google's OAuth 2.0 endpoint.

Functions

func AppEngineTokenSource

func AppEngineTokenSource(ctx appengine.Context, scope ...string) oauth2.TokenSource

AppEngineTokenSource returns a token source that fetches tokens issued to the current App Engine application's service account. If you are implementing a 3-legged OAuth 2.0 flow on App Engine that involves user accounts, see oauth2.Config instead.

You are required to provide a valid appengine.Context as context.

Example
package main

import (
	"net/http"

	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	"google.golang.org/appengine"
	"google.golang.org/appengine/urlfetch"
)

func main() {
	var req *http.Request // from the ServeHTTP handler
	ctx := appengine.NewContext(req)
	client := &http.Client{
		Transport: &oauth2.Transport{
			Source: google.AppEngineTokenSource(ctx, "https://www.googleapis.com/auth/bigquery"),
			Base: &urlfetch.Transport{
				Context: ctx,
			},
		},
	}
	client.Get("...")
}
Output:

func ComputeTokenSource

func ComputeTokenSource(account string) oauth2.TokenSource

ComputeTokenSource returns a token source that fetches access tokens from Google Compute Engine (GCE)'s metadata server. It's only valid to use this token source if your program is running on a GCE instance. If no account is specified, "default" is used. Further information about retrieving access tokens from the GCE metadata server can be found at https://cloud.google.com/compute/docs/authentication.

Example
package main

import (
	"net/http"

	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
)

func main() {
	client := &http.Client{
		Transport: &oauth2.Transport{
			// Fetch from Google Compute Engine's metadata server to retrieve
			// an access token for the provided account.
			// If no account is specified, "default" is used.
			Source: google.ComputeTokenSource(""),
		},
	}
	client.Get("...")
}
Output:

func JWTConfigFromJSON

func JWTConfigFromJSON(jsonKey []byte, scope ...string) (*jwt.Config, error)

JWTConfigFromJSON uses a Google Developers service account JSON key file to read the credentials that authorize and authenticate the requests. Create a service account on "Credentials" page under "APIs & Auth" for your project at https://console.developers.google.com to download a JSON key file.

Example
package main

import (
	"io/ioutil"
	"log"

	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
)

func main() {
	// Your credentials should be obtained from the Google
	// Developer Console (https://console.developers.google.com).
	// Navigate to your project, then see the "Credentials" page
	// under "APIs & Auth".
	// To create a service account client, click "Create new Client ID",
	// select "Service Account", and click "Create Client ID". A JSON
	// key file will then be downloaded to your computer.
	data, err := ioutil.ReadFile("/path/to/your-project-key.json")
	if err != nil {
		log.Fatal(err)
	}
	conf, err := google.JWTConfigFromJSON(data, "https://www.googleapis.com/auth/bigquery")
	if err != nil {
		log.Fatal(err)
	}
	// Initiate an http.Client. The following GET request will be
	// authorized and authenticated on the behalf of
	// your service account.
	client := conf.Client(oauth2.NoContext)
	client.Get("...")
}
Output:

Types

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