1 files changed, 163 insertions, 0 deletions
diff --git a/lib/facebook-graph-sdk/src/Facebook/Url/FacebookUrlDetectionHandler.php b/lib/facebook-graph-sdk/src/Facebook/Url/FacebookUrlDetectionHandler.php
new file mode 100644
index 0000000..5fbb9ce
--- /dev/null
+++ b/lib/facebook-graph-sdk/src/Facebook/Url/FacebookUrlDetectionHandler.php
@@ -0,0 +1,163 @@
+<?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\Url;
+
+/**
+ * Class FacebookUrlDetectionHandler
+ *
+ * @package Facebook
+ */
+class FacebookUrlDetectionHandler implements UrlDetectionInterface
+{
+    /**
+     * @inheritdoc
+     */
+    public function getCurrentUrl()
+    {
+        return $this->getHttpScheme() . '://' . $this->getHostName() . $this->getServerVar('REQUEST_URI');
+    }
+
+    /**
+     * Get the currently active URL scheme.
+     *
+     * @return string
+     */
+    protected function getHttpScheme()
+    {
+        return $this->isBehindSsl() ? 'https' : 'http';
+    }
+
+    /**
+     * Tries to detect if the server is running behind an SSL.
+     *
+     * @return boolean
+     */
+    protected function isBehindSsl()
+    {
+        // Check for proxy first
+        $protocol = $this->getHeader('X_FORWARDED_PROTO');
+        if ($protocol) {
+            return $this->protocolWithActiveSsl($protocol);
+        }
+
+        $protocol = $this->getServerVar('HTTPS');
+        if ($protocol) {
+            return $this->protocolWithActiveSsl($protocol);
+        }
+
+        return (string)$this->getServerVar('SERVER_PORT') === '443';
+    }
+
+    /**
+     * Detects an active SSL protocol value.
+     *
+     * @param string $protocol
+     *
+     * @return boolean
+     */
+    protected function protocolWithActiveSsl($protocol)
+    {
+        $protocol = strtolower((string)$protocol);
+
+        return in_array($protocol, ['on', '1', 'https', 'ssl'], true);
+    }
+
+    /**
+     * Tries to detect the host name of the server.
+     *
+     * Some elements adapted from
+     *
+     * @see https://github.com/symfony/HttpFoundation/blob/master/Request.php
+     *
+     * @return string
+     */
+    protected function getHostName()
+    {
+        // Check for proxy first
+        if ($host = $this->getHeader('X_FORWARDED_HOST')) {
+            $elements = explode(',', $host);
+            $host = $elements[count($elements) - 1];
+        } elseif (!$host = $this->getHeader('HOST')) {
+            if (!$host = $this->getServerVar('SERVER_NAME')) {
+                $host = $this->getServerVar('SERVER_ADDR');
+            }
+        }
+
+        // trim and remove port number from host
+        // host is lowercase as per RFC 952/2181
+        $host = strtolower(preg_replace('/:\d+$/', '', trim($host)));
+
+        // Port number
+        $scheme = $this->getHttpScheme();
+        $port = $this->getCurrentPort();
+        $appendPort = ':' . $port;
+
+        // Don't append port number if a normal port.
+        if (($scheme == 'http' && $port == '80') || ($scheme == 'https' && $port == '443')) {
+            $appendPort = '';
+        }
+
+        return $host . $appendPort;
+    }
+
+    protected function getCurrentPort()
+    {
+        // Check for proxy first
+        $port = $this->getHeader('X_FORWARDED_PORT');
+        if ($port) {
+            return (string)$port;
+        }
+
+        $protocol = (string)$this->getHeader('X_FORWARDED_PROTO');
+        if ($protocol === 'https') {
+            return '443';
+        }
+
+        return (string)$this->getServerVar('SERVER_PORT');
+    }
+
+    /**
+     * Returns the a value from the $_SERVER super global.
+     *
+     * @param string $key
+     *
+     * @return string
+     */
+    protected function getServerVar($key)
+    {
+        return isset($_SERVER[$key]) ? $_SERVER[$key] : '';
+    }
+
+    /**
+     * Gets a value from the HTTP request headers.
+     *
+     * @param string $key
+     *
+     * @return string
+     */
+    protected function getHeader($key)
+    {
+        return $this->getServerVar('HTTP_' . $key);
+    }
+}