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Filename : url-shortener.php
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<?php
/*
 * Copyright 2011 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.
 */

include_once __DIR__ . '/../vendor/autoload.php';
include_once "templates/base.php";

echo pageHeader('User Query - URL Shortener');

/*************************************************
 * Ensure you've downloaded your oauth credentials
 ************************************************/
if (!$oauth_credentials = getOAuthCredentialsFile()) {
  echo missingOAuth2CredentialsWarning();
  return;
}

/************************************************
  Make an API request on behalf of a user. In
  this case we need to have a valid OAuth 2.0
  token for the user, so we need to send them
  through a login flow. To do this we need some
  information from our API console project.
 ************************************************/
/************************************************
 * NOTICE:
 * The redirect URI is to this page, e.g:
 * http://localhost:8080/simplefileupload.php
 ************************************************/
$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];

$client = new Google_Client();
$client->setAuthConfig($oauth_credentials);
$client->setRedirectUri($redirect_uri);
$client->addScope("https://www.googleapis.com/auth/urlshortener");

/************************************************
 * When we create the service here, we pass the
 * client to it. The client then queries the service
 * for the required scopes, and uses that when
 * generating the authentication URL later.
 ************************************************/
$service = new Google_Service_Urlshortener($client);

/************************************************
 * If we're logging out we just need to clear our
 * local access token in this case
 ************************************************/
if (isset($_REQUEST['logout'])) {
  unset($_SESSION['access_token']);
}

/************************************************
 * If we have a code back from the OAuth 2.0 flow,
 * we need to exchange that with the
 * Google_Client::fetchAccessTokenWithAuthCode()
 * function. We store the resultant access token
 * bundle in the session, and redirect to ourself.
 ************************************************/
if (isset($_GET['code'])) {
  $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
  $client->setAccessToken($token);

  // store in the session also
  $_SESSION['access_token'] = $token;

  // redirect back to the example
  header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}

/************************************************
  If we have an access token, we can make
  requests, else we generate an authentication URL.
 ************************************************/
if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
  $client->setAccessToken($_SESSION['access_token']);
} else {
  $authUrl = $client->createAuthUrl();
}

/************************************************
  If we're signed in and have a request to shorten
  a URL, then we create a new URL object, set the
  unshortened URL, and call the 'insert' method on
  the 'url' resource. Note that we re-store the
  access_token bundle, just in case anything
  changed during the request - the main thing that
  might happen here is the access token itself is
  refreshed if the application has offline access.
 ************************************************/
if ($client->getAccessToken() && isset($_GET['url'])) {
  $url = new Google_Service_Urlshortener_Url();
  $url->longUrl = $_GET['url'];
  $short = $service->url->insert($url);
  $_SESSION['access_token'] = $client->getAccessToken();
}
?>

<div class="box">
<?php if (isset($authUrl)): ?>
  <div class="request">
    <a class='login' href='<?= $authUrl ?>'>Connect Me!</a>
  </div>
<?php elseif (empty($short)): ?>
  <form id="url" method="GET" action="<?= $_SERVER['PHP_SELF'] ?>">
    <input name="url" class="url" type="text">
    <input type="submit" value="Shorten">
  </form>
  <a class='logout' href='?logout'>Logout</a>
<?php else: ?>
  You created a short link! <br />
  <a href="<?= $short['id'] ?>"><?= $short['id'] ?></a>
  <div class="shortened">
    <pre><?php var_export($short) ?></pre>
  </div>
  <a href="<?= $_SERVER['PHP_SELF'] ?>">Create another</a>
<?php endif ?>
</div>

<?= pageFooter(__FILE__);