Facebook login implemented

website/queries/Facebook/Authentication/AccessToken.php

@@ -0,0 +1,160 @@
+<?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\Authentication;
+
+/**
+ * Class AccessToken
+ *
+ * @package Facebook
+ */
+class AccessToken
+{
+    /**
+     * The access token value.
+     *
+     * @var string
+     */
+    protected $value = '';
+
+    /**
+     * Date when token expires.
+     *
+     * @var \DateTime|null
+     */
+    protected $expiresAt;
+
+    /**
+     * Create a new access token entity.
+     *
+     * @param string $accessToken
+     * @param int    $expiresAt
+     */
+    public function __construct($accessToken, $expiresAt = 0)
+    {
+        $this->value = $accessToken;
+        if ($expiresAt) {
+            $this->setExpiresAtFromTimeStamp($expiresAt);
+        }
+    }
+
+    /**
+     * Generate an app secret proof to sign a request to Graph.
+     *
+     * @param string $appSecret The app secret.
+     *
+     * @return string
+     */
+    public function getAppSecretProof($appSecret)
+    {
+        return hash_hmac('sha256', $this->value, $appSecret);
+    }
+
+    /**
+     * Getter for expiresAt.
+     *
+     * @return \DateTime|null
+     */
+    public function getExpiresAt()
+    {
+        return $this->expiresAt;
+    }
+
+    /**
+     * Determines whether or not this is an app access token.
+     *
+     * @return bool
+     */
+    public function isAppAccessToken()
+    {
+        return strpos($this->value, '|') !== false;
+    }
+
+    /**
+     * Determines whether or not this is a long-lived token.
+     *
+     * @return bool
+     */
+    public function isLongLived()
+    {
+        if ($this->expiresAt) {
+            return $this->expiresAt->getTimestamp() > time() + (60 * 60 * 2);
+        }
+
+        if ($this->isAppAccessToken()) {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Checks the expiration of the access token.
+     *
+     * @return boolean|null
+     */
+    public function isExpired()
+    {
+        if ($this->getExpiresAt() instanceof \DateTime) {
+            return $this->getExpiresAt()->getTimestamp() < time();
+        }
+
+        if ($this->isAppAccessToken()) {
+            return false;
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns the access token as a string.
+     *
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Returns the access token as a string.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->getValue();
+    }
+
+    /**
+     * Setter for expires_at.
+     *
+     * @param int $timeStamp
+     */
+    protected function setExpiresAtFromTimeStamp($timeStamp)
+    {
+        $dt = new \DateTime();
+        $dt->setTimestamp($timeStamp);
+        $this->expiresAt = $dt;
+    }
+}