forked from Mirrors/oauth2
72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
// Copyright 2015 The oauth2 Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package google
|
|
|
|
import (
|
|
"crypto/rsa"
|
|
"fmt"
|
|
"time"
|
|
|
|
"golang.org/x/oauth2"
|
|
"golang.org/x/oauth2/internal"
|
|
"golang.org/x/oauth2/jws"
|
|
)
|
|
|
|
// JWTAccessTokenSourceFromJSON uses a Google Developers service account JSON
|
|
// key file to read the credentials that authorize and authenticate the
|
|
// requests, and returns a TokenSource that does not use any OAuth2 flow but
|
|
// instead creates a JWT and sends that as the access token.
|
|
// The audience is typically a URL that specifies the scope of the credentials.
|
|
//
|
|
// Note that this is not a standard OAuth flow, but rather an
|
|
// optimization supported by a few Google services.
|
|
// Unless you know otherwise, you should use JWTConfigFromJSON instead.
|
|
func JWTAccessTokenSourceFromJSON(jsonKey []byte, audience string) (oauth2.TokenSource, error) {
|
|
cfg, err := JWTConfigFromJSON(jsonKey)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("google: could not parse JSON key: %v", err)
|
|
}
|
|
pk, err := internal.ParseKey(cfg.PrivateKey)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("google: could not parse key: %v", err)
|
|
}
|
|
ts := &jwtAccessTokenSource{
|
|
email: cfg.Email,
|
|
audience: audience,
|
|
pk: pk,
|
|
}
|
|
tok, err := ts.Token()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return oauth2.ReuseTokenSource(tok, ts), nil
|
|
}
|
|
|
|
type jwtAccessTokenSource struct {
|
|
email, audience string
|
|
pk *rsa.PrivateKey
|
|
}
|
|
|
|
func (ts *jwtAccessTokenSource) Token() (*oauth2.Token, error) {
|
|
iat := time.Now()
|
|
exp := iat.Add(time.Hour)
|
|
cs := &jws.ClaimSet{
|
|
Iss: ts.email,
|
|
Sub: ts.email,
|
|
Aud: ts.audience,
|
|
Iat: iat.Unix(),
|
|
Exp: exp.Unix(),
|
|
}
|
|
hdr := &jws.Header{
|
|
Algorithm: "RS256",
|
|
Typ: "JWT",
|
|
}
|
|
msg, err := jws.Encode(hdr, cs, ts.pk)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("google: could not encode JWT: %v", err)
|
|
}
|
|
return &oauth2.Token{AccessToken: msg, TokenType: "Bearer"}, nil
|
|
}
|