appengine/standard/metadata/index.php (58 lines of code) (raw):
<?php
/**
* Copyright 2018 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.
*/
// Install composer dependencies with "composer install"
// @see http://getcomposer.org for more information.
require __DIR__ . '/vendor/autoload.php';
use Google\Auth\Credentials\GCECredentials;
/**
* This sample shows various ways to access the Metadata server, which provides
* information about your running instance.
* @see https://cloud.google.com/compute/docs/storing-retrieving-metadata
*/
# [START gae_metadata]
/**
* Requests a key from the Metadata server using the Google Cloud SDK. Install
* the Google Cloud SDK by running "composer install google/cloud"
*
* @param $metadataKey the key for the metadata server
*/
function request_metadata_using_google_cloud($metadataKey)
{
$metadata = new Google\Cloud\Core\Compute\Metadata();
$metadataValue = $metadata->get($metadataKey);
return $metadataValue;
}
/**
* Requests a key from the Metadata server using cURL.
*
* @param $metadataKey the key for the metadata server
*/
function request_metadata_using_curl($metadataKey)
{
$url = 'http://metadata/computeMetadata/v1/' . $metadataKey;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Metadata-Flavor: Google'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
return curl_exec($ch);
}
# [END gae_metadata]
function print_metadata_paths($root = '')
{
$keys = request_metadata_using_google_cloud($root);
$html = '<ul>';
foreach (explode("\n", trim($keys)) as $key) {
$path = $root . $key;
$html .= '<li>';
if (substr($key, -1) == '/') {
$html .= sprintf('<strong>%s</strong><br />', $key);
$html .= print_metadata_paths($path);
} else {
$html .= sprintf('<a href="/?path=%s">%s</a>', urlencode($path), $key);
}
$html .= '</li>';
}
return $html . '</ul>';
}
if (!GCECredentials::onGce()) {
exit('The metadata server can only be reached when running on App Engine.');
}
?>
<html>
<body>
<h2>Call the Metadata server</h2>
<?php if (isset($_GET['path'])): ?>
<h3>Metadata for <code><?= $_GET['path'] ?></code>:</h3>
<ul>
<?php if ('/token' == substr($_GET['path'], -6)): ?>
<li><em>the metadata value requested contains sensitive information and so will not be displayed here</em></li>
<?php else: ?>
<li>With Google Cloud: <pre><?= request_metadata_using_google_cloud($_GET['path']) ?></pre></li>
<li>With cURL: <pre><?= request_metadata_using_curl($_GET['path']) ?></pre></li>
<?php endif ?>
</ul>
<?php endif ?>
<h3>All metadata keys:</h3>
<?= print_metadata_paths() ?>
</body>
</html>