New provider for just released LinkedIn oAuth2

libraries/Provider/Linkedin.php

@@ -0,0 +1,66 @@
+<?php
+
+if (!defined('BASEPATH'))
+  exit('No direct script access allowed');
+
+/**
+ * LinkedIn OAuth2 Provider
+ * https://developer.linkedin.com/documents/authentication
+ * 
+ * @package    CodeIgniter/OAuth2
+ * @category   Provider
+ * @author     Benjamin Hill benjaminhill@gmail.com
+ * @copyright  (c) Same as parent project
+ * @license    http://philsturgeon.co.uk/code/dbad-license
+ */
+class OAuth2_Provider_Linkedin extends OAuth2_Provider {
+
+  public $method = 'POST';
+  public $scope_seperator = ' ';
+
+  public function __construct(array $options = array()) {
+    if (empty($options['scope'])) {
+      $options['scope'] = array(
+          'r_basicprofile',
+          'r_emailaddress'
+      );
+    }
+
+    // Array it if its string
+    $options['scope'] = (array) $options['scope'];
+
+    parent::__construct($options);
+  }
+
+  public function url_authorize() {
+    return 'https://www.linkedin.com/uas/oauth2/authorization';
+  }
+
+  public function url_access_token() {
+    return 'https://www.linkedin.com/uas/oauth2/accessToken';
+  }
+
+  public function get_user_info(OAuth2_Token_Access $token) {
+
+    $url_profile = 'https://api.linkedin.com/v1/people/~?format=json&' . http_build_query(array(
+                'oauth2_access_token' => $token->access_token,
+    ));
+    $user = json_decode(file_get_contents($url_profile), true);
+
+    $url_email = 'https://api.linkedin.com/v1/people/~/email-address?format=json&' . http_build_query(array(
+                'oauth2_access_token' => $token->access_token,
+    ));
+    $user_email = json_decode(file_get_contents($url_email), true);
+
+    return array(
+        'first_name' => $user['firstName'],
+        'last_name' => $user['lastName'],
+        'title' => $user['headline'],
+        'email' => $user_email,
+        'urls' => array(
+            'LinkedIn' => $user->siteStandardProfileRequest->url
+        ),
+    );
+  }
+
+}