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raffie-rest/jwt
===============

Google oAuth2 JWT Generator

0525PHP

Since Apr 5Pushed 11y ago1 watchersCompare

[ Source](https://github.com/raffie-rest/jwt)[ Packagist](https://packagist.org/packages/raffie-rest/jwt)[ RSS](/packages/raffie-rest-jwt/feed)WikiDiscussions master Synced 1mo ago

READMEChangelogDependenciesVersions (1)Used By (0)

JWT
===

[](#jwt)

Google® oAuth2 JWT Generator Class

- [Using OAuth 2.0 to Access Google APIs](https://developers.google.com/accounts/docs/OAuth2)
- [Using OAuth 2.0 for Server to Server Applications](https://developers.google.com/accounts/docs/OAuth2ServiceAccount)

Introduction
------------

[](#introduction)

This class is already hooked up in another proprietary Remote REST abstraction, but I aim to implement the Google oAuth2 service account auth method by virtue of this class in my [Adapter](https://github.com/raffie-rest/adapter) project also.

For the moment, you might be able to incorporate it in your own Remote REST abstraction.

It is exactly intended for that purpose; those who find the PHP google client libraries too bloated, but have a hard time figuring out how to generate a JWT / negotiating for a token whilst dodging cryptic `bad_request` / `invalid_grant` responses. Mostly this is due to the system clock being out of sync with NTP, but this class accounts for this.

Generating a JWT
----------------

[](#generating-a-jwt)

Feed it a config array, like so:

```
$jwtConfig = [
  'key'    => [
    'pass'  => 'notasecret',
    // Converted from the .p12 off of the Developer console
    'path'  => 'file://' . storage_path() . '/certs/google.pem'
  ],
  'header'  => [
    'alg'  => 'RS256',
    'typ'  => 'JWT'
  ],
  'claim_set' => [
    'iss'     => '',  // service account e-mail
    'scope'   => 'https://www.googleapis.com/auth/calendar https://www.googleapis.com/auth/prediction',
    'aud'     => 'https://www.googleapis.com/oauth2/v3/token',
    'exp'     => '+30 minutes',
    'sub'     => ''
  ]
];

$generator = new Generator($jwtConfig);

$returnedJwt = $generator->generate();

```

Make sure that the relevant API's are enabled, and the user has read/write access.

Negotiate for an access token
-----------------------------

[](#negotiate-for-an-access-token)

The JWT can be used to negotiate an access token via the pseudocode below:

```
POST https://www.googleapis.com/oauth2/v3/token HTTP/1.1
Content-Type: application/x-www-form-urlencoded
grant_type=urlencode(JWT::$grant_type)&assertion=urlencode($returnedJwt)

```

In the case of Google oAuth2, the `grant_type` is virtually always `urn:ietf:params:oauth:grant-type:jwt-bearer`.

### If stuff goes wrong

[](#if-stuff-goes-wrong)

The class is aimed at preventing the cryptic `bad_request` stuff by converting your time to UTC, but always make sure your system time is in sync with NTP and that you use your service account e-mail address (not your ID).

### If all is well...

[](#if-all-is-well)

If everything goes well, you get something like this you can cache for further usage:

```
{
  "access_token" : "1/8xbJqaOZXSUZbHLl5EOtu1pxz3fmmetKx9W8CV4t79M",
  "token_type" : "Bearer",
  "expires_in" : 3600
}

```

After the access token is expired, you can simply rebuild the JWT and request a new access token.

Authenticate with the access token
----------------------------------

[](#authenticate-with-the-access-token)

Put this header on each Google API request:

```
GET https://www.googleapis.com/calendar/v3/users/me/calendarlist HTTP/1.1
Authorization: Bearer 1/8xbJqaOZXSUZbHLl5EOtu1pxz3fmmetKx9W8CV4t79M

```

###  Health Score

22

—

LowBetter than 22% of packages

Maintenance20

Infrequent updates — may be unmaintained

Popularity12

Limited adoption so far

Community9

Small or concentrated contributor base

Maturity41

Maturing project, gaining track record

 Bus Factor1

Top contributor holds 66.7% of commits — single point of failure

How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window.

**Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores.

**Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement.

**Maturity (30%)** — Project age, version count, PHP version support, and release stability.

### Community

Maintainers

![](https://www.gravatar.com/avatar/cdf9d526b6fdee2ef3acdd3f3f38a9b9bada96e8a6a82ee684fd87ab85c3010d?d=identicon)[raffie.rest](/maintainers/raffie.rest)

---

Top Contributors

[![raffie-rest](https://avatars.githubusercontent.com/u/11791963?v=4)](https://github.com/raffie-rest "raffie-rest (2 commits)")[![r-hebing](https://avatars.githubusercontent.com/u/3007939?v=4)](https://github.com/r-hebing "r-hebing (1 commits)")

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