From 5c7f2f17f9c471d306955df457c7cab4e5c6ed3b Mon Sep 17 00:00:00 2001
From: Snap <snapwilliam@gmail.com>
Date: Thu, 16 Apr 2015 14:51:26 -0700
Subject: Google's OpenID Connect method $google_client_id &
 $google_client_secret must be added to db.inc.php!

---
 .../src/Google/Auth/AssertionCredentials.php       | 136 +++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 includes/google-api-php-client-master/src/Google/Auth/AssertionCredentials.php

(limited to 'includes/google-api-php-client-master/src/Google/Auth/AssertionCredentials.php')

diff --git a/includes/google-api-php-client-master/src/Google/Auth/AssertionCredentials.php b/includes/google-api-php-client-master/src/Google/Auth/AssertionCredentials.php
new file mode 100644
index 0000000..831d374
--- /dev/null
+++ b/includes/google-api-php-client-master/src/Google/Auth/AssertionCredentials.php
@@ -0,0 +1,136 @@
+<?php
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+if (!class_exists('Google_Client')) {
+  require_once dirname(__FILE__) . '/../autoload.php';
+}
+
+/**
+ * Credentials object used for OAuth 2.0 Signed JWT assertion grants.
+ */
+class Google_Auth_AssertionCredentials
+{
+  const MAX_TOKEN_LIFETIME_SECS = 3600;
+
+  public $serviceAccountName;
+  public $scopes;
+  public $privateKey;
+  public $privateKeyPassword;
+  public $assertionType;
+  public $sub;
+  /**
+   * @deprecated
+   * @link http://tools.ietf.org/html/draft-ietf-oauth-json-web-token-06
+   */
+  public $prn;
+  private $useCache;
+
+  /**
+   * @param $serviceAccountName
+   * @param $scopes array List of scopes
+   * @param $privateKey
+   * @param string $privateKeyPassword
+   * @param string $assertionType
+   * @param bool|string $sub The email address of the user for which the
+   *              application is requesting delegated access.
+   * @param bool useCache Whether to generate a cache key and allow
+   *              automatic caching of the generated token.
+   */
+  public function __construct(
+      $serviceAccountName,
+      $scopes,
+      $privateKey,
+      $privateKeyPassword = 'notasecret',
+      $assertionType = 'http://oauth.net/grant_type/jwt/1.0/bearer',
+      $sub = false,
+      $useCache = true
+  ) {
+    $this->serviceAccountName = $serviceAccountName;
+    $this->scopes = is_string($scopes) ? $scopes : implode(' ', $scopes);
+    $this->privateKey = $privateKey;
+    $this->privateKeyPassword = $privateKeyPassword;
+    $this->assertionType = $assertionType;
+    $this->sub = $sub;
+    $this->prn = $sub;
+    $this->useCache = $useCache;
+  }
+  
+  /**
+   * Generate a unique key to represent this credential.
+   * @return string
+   */
+  public function getCacheKey()
+  {
+    if (!$this->useCache) {
+      return false;
+    }
+    $h = $this->sub;
+    $h .= $this->assertionType;
+    $h .= $this->privateKey;
+    $h .= $this->scopes;
+    $h .= $this->serviceAccountName;
+    return md5($h);
+  }
+
+  public function generateAssertion()
+  {
+    $now = time();
+
+    $jwtParams = array(
+          'aud' => Google_Auth_OAuth2::OAUTH2_TOKEN_URI,
+          'scope' => $this->scopes,
+          'iat' => $now,
+          'exp' => $now + self::MAX_TOKEN_LIFETIME_SECS,
+          'iss' => $this->serviceAccountName,
+    );
+
+    if ($this->sub !== false) {
+      $jwtParams['sub'] = $this->sub;
+    } else if ($this->prn !== false) {
+      $jwtParams['prn'] = $this->prn;
+    }
+
+    return $this->makeSignedJwt($jwtParams);
+  }
+
+  /**
+   * Creates a signed JWT.
+   * @param array $payload
+   * @return string The signed JWT.
+   */
+  private function makeSignedJwt($payload)
+  {
+    $header = array('typ' => 'JWT', 'alg' => 'RS256');
+
+    $payload = json_encode($payload);
+    // Handle some overzealous escaping in PHP json that seemed to cause some errors
+    // with claimsets.
+    $payload = str_replace('\/', '/', $payload);
+
+    $segments = array(
+      Google_Utils::urlSafeB64Encode(json_encode($header)),
+      Google_Utils::urlSafeB64Encode($payload)
+    );
+
+    $signingInput = implode('.', $segments);
+    $signer = new Google_Signer_P12($this->privateKey, $this->privateKeyPassword);
+    $signature = $signer->sign($signingInput);
+    $segments[] = Google_Utils::urlSafeB64Encode($signature);
+
+    return implode(".", $segments);
+  }
+}
-- 
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