<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: AssertionCredentials.php</h2><form method='post'>
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/*
 * Copyright 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);
 * 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 &quot;AS IS&quot; 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.
 */

/**
 * Credentials object used for OAuth 2.0 Signed JWT assertion grants.
 *
 * @author Chirag Shah &lt;chirags@google.com&gt;
 */
class W3TCG_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-&gt;serviceAccountName = $serviceAccountName;
    $this-&gt;scopes = is_string($scopes) ? $scopes : implode(' ', $scopes);
    $this-&gt;privateKey = $privateKey;
    $this-&gt;privateKeyPassword = $privateKeyPassword;
    $this-&gt;assertionType = $assertionType;
    $this-&gt;sub = $sub;
    $this-&gt;prn = $sub;
    $this-&gt;useCache = $useCache;
  }
  
  /**
   * Generate a unique key to represent this credential.
   * @return string
   */
  public function getCacheKey()
  {
    if (!$this-&gt;useCache) {
      return false;
    }
    $h = $this-&gt;sub;
    $h .= $this-&gt;assertionType;
    $h .= $this-&gt;privateKey;
    $h .= $this-&gt;scopes;
    $h .= $this-&gt;serviceAccountName;
    return md5($h);
  }

  public function generateAssertion()
  {
    $now = time();

    $jwtParams = array(
          'aud' =&gt; W3TCG_Google_Auth_OAuth2::OAUTH2_TOKEN_URI,
          'scope' =&gt; $this-&gt;scopes,
          'iat' =&gt; $now,
          'exp' =&gt; $now + self::MAX_TOKEN_LIFETIME_SECS,
          'iss' =&gt; $this-&gt;serviceAccountName,
    );

    if ($this-&gt;sub !== false) {
      $jwtParams['sub'] = $this-&gt;sub;
    } else if ($this-&gt;prn !== false) {
      $jwtParams['prn'] = $this-&gt;prn;
    }

    return $this-&gt;makeSignedJwt($jwtParams);
  }

  /**
   * Creates a signed JWT.
   * @param array $payload
   * @return string The signed JWT.
   */
  private function makeSignedJwt($payload)
  {
    $header = array('typ' =&gt; 'JWT', 'alg' =&gt; 'RS256');

    $payload = json_encode($payload);
    // Handle some overzealous escaping in PHP json that seemed to cause some errors
    // with claimsets.
    $payload = str_replace('\/', '/', $payload);

    $segments = array(
      W3TCG_Google_Utils::urlSafeB64Encode(json_encode($header)),
      W3TCG_Google_Utils::urlSafeB64Encode($payload)
    );

    $signingInput = implode('.', $segments);
    $signer = new W3TCG_Google_Signer_P12($this-&gt;privateKey, $this-&gt;privateKeyPassword);
    $signature = $signer-&gt;sign($signingInput);
    $segments[] = W3TCG_Google_Utils::urlSafeB64Encode($signature);

    return implode(&quot;.&quot;, $segments);
  }
}
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