<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: AppIdentity.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
/*
 * Copyright 2014 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.
 */

/*
 * WARNING - this class depends on the Google App Engine PHP library
 * which is 5.3 and above only, so if you include this in a PHP 5.2
 * setup or one without 5.3 things will blow up.
 */
use google\appengine\api\app_identity\AppIdentityService;

/**
 * Authentication via the Google App Engine App Identity service.
 */
class W3TCG_Google_Auth_AppIdentity extends W3TCG_Google_Auth_Abstract
{
  const CACHE_PREFIX = &quot;W3TCG_Google_Auth_AppIdentity::&quot;;
  private $key = null;
  private $client;
  private $token = false;
  private $tokenScopes = false;

  public function __construct(W3TCG_Google_Client $client, $config = null)
  {
    $this-&gt;client = $client;
  }

  /**
   * Retrieve an access token for the scopes supplied.
   */
  public function authenticateForScope($scopes)
  {
    if ($this-&gt;token &amp;&amp; $this-&gt;tokenScopes == $scopes) {
      return $this-&gt;token;
    }

    $cacheKey = self::CACHE_PREFIX;
    if (is_string($scopes)) {
      $cacheKey .= $scopes;
    } else if (is_array($scopes)) {
      $cacheKey .= implode(&quot;:&quot;, $scopes);
    }

    $this-&gt;token = $this-&gt;client-&gt;getCache()-&gt;get($cacheKey);
    if (!$this-&gt;token) {
      $this-&gt;token = AppIdentityService::getAccessToken($scopes);
      if ($this-&gt;token) {
        $this-&gt;client-&gt;getCache()-&gt;set(
            $cacheKey,
            $this-&gt;token
        );
      }
    }
    $this-&gt;tokenScopes = $scopes;
    return $this-&gt;token;
  }

  /**
   * Perform an authenticated / signed apiHttpRequest.
   * This function takes the apiHttpRequest, calls apiAuth-&gt;sign on it
   * (which can modify the request in what ever way fits the auth mechanism)
   * and then calls apiCurlIO::makeRequest on the signed request
   *
   * @param W3TCG_Google_Http_Request $request
   * @return W3TCG_Google_Http_Request The resulting HTTP response including the
   * responseHttpCode, responseHeaders and responseBody.
   */
  public function authenticatedRequest(W3TCG_Google_Http_Request $request)
  {
    $request = $this-&gt;sign($request);
    return $this-&gt;client-&gt;getIo()-&gt;makeRequest($request);
  }

  public function sign(W3TCG_Google_Http_Request $request)
  {
    if (!$this-&gt;token) {
      // No token, so nothing to do.
      return $request;
    }
    // Add the OAuth2 header to the request
    $request-&gt;setRequestHeaders(
        array('Authorization' =&gt; 'Bearer ' . $this-&gt;token['access_token'])
    );

    return $request;
  }
}
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