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app/Vendor/Facebook/FacebookPageTabHelper.php

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+<?php
+/**
+ * Copyright 2014 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook;
+
+/**
+ * Class FacebookPageTabHelper
+ * @package Facebook
+ * @author Fosco Marotto <fjm@fb.com>
+ */
+class FacebookPageTabHelper extends FacebookCanvasLoginHelper
+{
+
+  /**
+   * @var array|null
+   */
+  protected $pageData;
+
+  /**
+   * Initialize the helper and process available signed request data.
+   *
+   * @param string|null $appId
+   * @param string|null $appSecret
+   */
+  public function __construct($appId = null, $appSecret = null)
+  {
+    parent::__construct($appId, $appSecret);
+
+    if (!$this->signedRequest) {
+      return;
+    }
+
+    $this->pageData = $this->signedRequest->get('page');
+  }
+
+  /**
+   * Returns a value from the page data.
+   *
+   * @param string $key
+   * @param mixed|null $default
+   *
+   * @return mixed|null
+   */
+  public function getPageData($key, $default = null)
+  {
+    if (isset($this->pageData[$key])) {
+      return $this->pageData[$key];
+    }
+    return $default;
+  }
+
+  /**
+   * Returns true if the page is liked by the user.
+   *
+   * @return boolean
+   */
+  public function isLiked()
+  {
+    return $this->getPageData('liked') === true;
+  }
+
+  /**
+   * Returns true if the user is an admin.
+   *
+   * @return boolean
+   */
+  public function isAdmin()
+  {
+    return $this->getPageData('admin') === true;
+  }
+
+  /**
+   * Returns the page id if available.
+   *
+   * @return string|null
+   */
+  public function getPageId()
+  {
+    return $this->getPageData('id');
+  }
+
+}