forked from Mirrors/oauth2
104 lines
3.5 KiB
Go
104 lines
3.5 KiB
Go
// Copyright 2014 The oauth2 Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package google provides support for making
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// OAuth2 authorized and authenticated HTTP requests
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// to Google APIs. It supports Web server, client-side,
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// service accounts, Google Compute Engine service accounts,
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// and Google App Engine service accounts authorization
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// and authentications flows:
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//
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// For more information, please read
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// https://developers.google.com/accounts/docs/OAuth2.
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package google // import "golang.org/x/oauth2/google"
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"time"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/jwt"
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"google.golang.org/cloud/compute/metadata"
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)
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// TODO(bradfitz,jbd): import "google.golang.org/cloud/compute/metadata" instead of
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// the metaClient and metadata.google.internal stuff below.
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// Endpoint is Google's OAuth 2.0 endpoint.
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var Endpoint = oauth2.Endpoint{
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AuthURL: "https://accounts.google.com/o/oauth2/auth",
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TokenURL: "https://accounts.google.com/o/oauth2/token",
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}
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// JWTTokenURL is Google's OAuth 2.0 token URL to use with the JWT flow.
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const JWTTokenURL = "https://accounts.google.com/o/oauth2/token"
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// JWTConfigFromJSON uses a Google Developers service account JSON key file to read
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// the credentials that authorize and authenticate the requests.
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// Create a service account on "Credentials" page under "APIs & Auth" for your
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// project at https://console.developers.google.com to download a JSON key file.
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func JWTConfigFromJSON(ctx oauth2.Context, jsonKey []byte, scope ...string) (*jwt.Config, error) {
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var key struct {
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Email string `json:"client_email"`
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PrivateKey string `json:"private_key"`
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}
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if err := json.Unmarshal(jsonKey, &key); err != nil {
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return nil, err
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}
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return &jwt.Config{
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Email: key.Email,
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PrivateKey: []byte(key.PrivateKey),
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Scopes: scope,
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TokenURL: JWTTokenURL,
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}, nil
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}
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// ComputeTokenSource returns a token source that fetches access tokens
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// from Google Compute Engine (GCE)'s metadata server. It's only valid to use
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// this token source if your program is running on a GCE instance.
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// If no account is specified, "default" is used.
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// Further information about retrieving access tokens from the GCE metadata
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// server can be found at https://cloud.google.com/compute/docs/authentication.
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func ComputeTokenSource(account string) oauth2.TokenSource {
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return oauth2.ReuseTokenSource(nil, computeSource{account: account})
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}
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type computeSource struct {
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account string
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}
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func (cs computeSource) Token() (*oauth2.Token, error) {
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if !metadata.OnGCE() {
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return nil, errors.New("oauth2/google: can't get a token from the metadata service; not running on GCE")
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}
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acct := cs.account
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if acct == "" {
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acct = "default"
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}
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tokenJSON, err := metadata.Get("instance/service-accounts/" + acct + "/token")
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if err != nil {
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return nil, err
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}
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var res struct {
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AccessToken string `json:"access_token"`
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ExpiresInSec int `json:"expires_in"`
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TokenType string `json:"token_type"`
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}
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err = json.NewDecoder(strings.NewReader(tokenJSON)).Decode(&res)
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if err != nil {
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return nil, fmt.Errorf("oauth2/google: invalid token JSON from metadata: %v", err)
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}
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if res.ExpiresInSec == 0 || res.AccessToken == "" {
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return nil, fmt.Errorf("oauth2/google: incomplete token received from metadata")
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}
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return &oauth2.Token{
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AccessToken: res.AccessToken,
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TokenType: res.TokenType,
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Expiry: time.Now().Add(time.Duration(res.ExpiresInSec) * time.Second),
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}, nil
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}
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