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<?php |
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/** |
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* Copyright 2017 Facebook, Inc. |
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* |
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* You are hereby granted a non-exclusive, worldwide, royalty-free license to |
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* use, copy, modify, and distribute this software in source code or binary |
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* form for use in connection with the web services and APIs provided by |
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* Facebook. |
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* |
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* As with any software that integrates with the Facebook platform, your use |
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* of this software is subject to the Facebook Developer Principles and |
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* Policies [http://developers.facebook.com/policy/]. This copyright notice |
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* shall be included in all copies or substantial portions of the software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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*/ |
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namespace Facebook\Url; |
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/** |
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* @package Facebook |
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*/ |
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class UrlDetectionHandler implements UrlDetectionInterface |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCurrentUrl() |
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{ |
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return $this->getHttpScheme() . '://' . $this->getHostName() . $this->getServerVar('REQUEST_URI'); |
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} |
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/** |
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* Get the currently active URL scheme. |
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* |
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* @return string |
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*/ |
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protected function getHttpScheme() |
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{ |
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return $this->isBehindSsl() ? 'https' : 'http'; |
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} |
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/** |
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* Tries to detect if the server is running behind an SSL. |
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* |
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* @return bool |
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*/ |
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protected function isBehindSsl() |
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{ |
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// Check for proxy first |
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$protocol = $this->getHeader('X_FORWARDED_PROTO'); |
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if ($protocol) { |
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return $this->protocolWithActiveSsl($protocol); |
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} |
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$protocol = $this->getServerVar('HTTPS'); |
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if ($protocol) { |
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return $this->protocolWithActiveSsl($protocol); |
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} |
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return (string)$this->getServerVar('SERVER_PORT') === '443'; |
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} |
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/** |
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* Detects an active SSL protocol value. |
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* |
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* @param string $protocol |
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* |
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* @return bool |
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*/ |
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protected function protocolWithActiveSsl($protocol) |
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{ |
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$protocol = strtolower((string)$protocol); |
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return in_array($protocol, ['on', '1', 'https', 'ssl'], true); |
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} |
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/** |
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* Tries to detect the host name of the server. |
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* |
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* Some elements adapted from |
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* |
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* @see https://github.com/symfony/HttpFoundation/blob/master/Request.php |
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* |
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* @return string |
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*/ |
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protected function getHostName() |
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{ |
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// Check for proxy first |
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$header = $this->getHeader('X_FORWARDED_HOST'); |
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if ($header && $this->isValidForwardedHost($header)) { |
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$elements = explode(',', $header); |
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$host = $elements[count($elements) - 1]; |
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} elseif (!$host = $this->getHeader('HOST')) { |
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if (!$host = $this->getServerVar('SERVER_NAME')) { |
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$host = $this->getServerVar('SERVER_ADDR'); |
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} |
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} |
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// trim and remove port number from host |
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// host is lowercase as per RFC 952/2181 |
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$host = strtolower(preg_replace('/:\d+$/', '', trim($host))); |
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// Port number |
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$scheme = $this->getHttpScheme(); |
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$port = $this->getCurrentPort(); |
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$appendPort = ':' . $port; |
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// Don't append port number if a normal port. |
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if (($scheme == 'http' && $port == '80') || ($scheme == 'https' && $port == '443')) { |
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$appendPort = ''; |
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} |
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return $host . $appendPort; |
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} |
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protected function getCurrentPort() |
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{ |
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// Check for proxy first |
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$port = $this->getHeader('X_FORWARDED_PORT'); |
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if ($port) { |
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return (string)$port; |
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} |
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$protocol = (string)$this->getHeader('X_FORWARDED_PROTO'); |
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if ($protocol === 'https') { |
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return '443'; |
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} |
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return (string)$this->getServerVar('SERVER_PORT'); |
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} |
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/** |
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* Returns the a value from the $_SERVER super global. |
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* |
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* @param string $key |
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* |
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* @return string |
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*/ |
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protected function getServerVar($key) |
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{ |
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return isset($_SERVER[$key]) ? $_SERVER[$key] : ''; |
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} |
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/** |
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* Gets a value from the HTTP request headers. |
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* |
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* @param string $key |
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* |
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* @return string |
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*/ |
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protected function getHeader($key) |
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{ |
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return $this->getServerVar('HTTP_' . $key); |
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} |
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/** |
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* Checks if the value in X_FORWARDED_HOST is a valid hostname |
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* Could prevent unintended redirections. |
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* |
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* @param string $header |
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* |
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* @return bool |
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*/ |
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protected function isValidForwardedHost($header) |
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{ |
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$elements = explode(',', $header); |
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$host = $elements[count($elements) - 1]; |
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return preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i", $host) //valid chars check |
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&& 0 < strlen($host) && strlen($host) < 254 //overall length check |
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&& preg_match("/^[^\.]{1,63}(\.[^\.]{1,63})*$/", $host); //length of each label |
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} |
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} |
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facebook /
php-graph-sdk
