Added google_offline example

Author: logical-and

examples/google_offline.php

@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * Example of retrieving an authentication token of the Google service
+ *
+ * PHP version 5.4
+ *
+ * @author     And <and.webdev@gmail.com>
+ * @author     David Desberg <david@daviddesberg.com>
+ * @author     Pieter Hordijk <info@pieterhordijk.com>
+ * @copyright  Copyright (c) 2015 The authors
+ * @license    http://www.opensource.org/licenses/mit-license.html  MIT License
+ */
+
+use OAuth\OAuth2\Service\Google;
+use OAuth\Common\Storage\Session;
+use OAuth\Common\Consumer\Credentials;
+
+/**
+ * Bootstrap the example
+ */
+require_once __DIR__ . '/bootstrap.php';
+
+// Session storage
+$storage = new Session();
+
+// Setup the credentials for the requests
+$credentials = new Credentials(
+    $servicesCredentials['google']['key'],
+    $servicesCredentials['google']['secret'],
+    $currentUri
+);
+
+// Instantiate the Google service using the credentials, http client and storage mechanism for the token
+/** @var Google $googleService */
+$googleService = $serviceFactory->createService('google', $credentials, $storage,
+	[Google::SCOPE_USERINFO_EMAIL, Google::SCOPE_USERINFO_PROFILE]);
+
+if (!empty($_GET['clear']) && $_GET['clear'] === 'clear') {
+	$googleService->getStorage()->clearToken($googleService->service());
+	header("Location: $currentUri", TRUE);
+} elseif ($googleService->isGlobalRequestArgumentsPassed() OR
+	$googleService->getStorage()->hasAccessToken($googleService->service())) {
+
+	if (!$googleService->getStorage()->hasAccessToken($googleService->service())) $googleService->retrieveAccessTokenByGlobReqArgs();
+
+    // Retrieve a token and send a request
+    $result = $googleService->requestJSON('https://www.googleapis.com/oauth2/v1/userinfo');
+
+    // Show some of the resultant data
+    echo 'Your unique google user id is: ' . $result['id'] . ' and your name is ' . $result['name'];
+
+	echo '<br />';
+	$extractor = $googleService->constructExtractor();
+	echo 'Your extracted email is a: ' . $extractor->getEmail() . ', ' .
+		'<br>and image: ' . inline_image($extractor->getImageRawData(50));
+
+	echo '<br />';
+	echo '<br />';
+	echo "<a href='$currentUri?clear=clear'>Clear offline access token</a>";
+} elseif (!empty($_GET['go']) && $_GET['go'] === 'go') {
+    $googleService->setAccessType('offline')->redirectToAuthorizationUri();
+} else {
+	echo "<a href='$currentUri?go=go'>Login with Google!</a>";
+}

src/OAuth2/Service/Google.php

@@ -113,6 +113,8 @@ public function setAccessType($accessType)
 			throw new InvalidAccessTypeException('Invalid accessType, expected either online or offline');
 		}
 		$this->accessType = $accessType;
+
+		return $this;
 	}
 
 	/**