获取服务器到服务器访问(谷歌服务帐户)令牌.invalid_grant错误

Question

我得到

{ "error": "invalid_grant", "error_description": "Bad Request" }

当我试图从谷歌获得访问令牌时。我在关注https://developers.google.com/identity/protocols/OAuth2ServiceAccount.我想我生成JWT令牌的方式可能不正确？

var header = { "alg": "RS256", "typ": "JWT" };
var body = {
    iss:'[e-mail]',
    scope: 'https://www.googleapis.com/auth/calendar',
    aud: 'https://www.googleapis.com/oauth2/v4/token',
    exp: Date.now() + ONE_HOUR,
    iat: Date.now(),
};
var token = jsrsasign.jws.JWS.sign('RS256', header, body, googleServicePrivateKey);
return Q.Promise(function(resolve, reject) {
    superagent.post('https://www.googleapis.com/oauth2/v4/token')
        .set('Content-Type', 'application/x-www-form-urlencoded')
        .send({
            grant_type: encodeURIComponent('urn:ietf:params:oauth:grant-type:jwt-bearer'),
            assertion: token
        })
        .end(function(err, res) {
            if (err) return reject(err);
            resolve(res.body);
        });
});

我的googleServicePrivateKey看起来像

'-----BEGIN PRIVATE KEY-----nMIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCNPsOIG1HGgMhPnG...

Isit ok？用那些n？

Answer 1

好的，使用kjwt解决了问题，并省略了到期/发布日期。