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<?php |
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namespace SilverStripe\Control; |
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use SilverStripe\Core\Environment; |
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class HTTPRequestBuilder |
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{ |
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/** |
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* Create HTTPRequest instance from the current environment variables. |
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* May throw errors if request is invalid. |
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* |
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* @throws HTTPResponse_Exception |
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* @return HTTPRequest |
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*/ |
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public static function createFromEnvironment() |
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{ |
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// Clean and update live global variables |
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$variables = static::cleanEnvironment(Environment::getVariables()); |
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Environment::setVariables($variables); // Currently necessary for SSViewer, etc to work |
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// Health-check prior to creating environment |
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return static::createFromVariables($variables, @file_get_contents('php://input')); |
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} |
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/** |
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* Build HTTPRequest from given variables |
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* |
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* @param array $variables |
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* @param string $input Request body |
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* @return HTTPRequest |
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*/ |
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public static function createFromVariables(array $variables, $input) |
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{ |
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// Strip `url` out of querystring |
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$url = $variables['_GET']['url']; |
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unset($variables['_GET']['url']); |
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// Build request |
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$request = new HTTPRequest( |
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$variables['_SERVER']['REQUEST_METHOD'], |
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$url, |
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$variables['_GET'], |
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$variables['_POST'], |
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$input |
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); |
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// Set the scheme to HTTPS if needed |
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if ((!empty($variables['_SERVER']['HTTPS']) && $variables['_SERVER']['HTTPS'] != 'off') |
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|| isset($variables['_SERVER']['SSL'])) { |
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$request->setScheme('https'); |
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} |
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// Set the client IP |
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if (!empty($variables['_SERVER']['REMOTE_ADDR'])) { |
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$request->setIP($variables['_SERVER']['REMOTE_ADDR']); |
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} |
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// Add headers |
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$headers = static::extractRequestHeaders($variables['_SERVER']); |
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foreach ($headers as $header => $value) { |
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$request->addHeader($header, $value); |
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} |
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// Initiate an empty session - doesn't initialize an actual PHP session (see HTTPApplication) |
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$session = new Session(isset($variables['_SESSION']) ? $variables['_SESSION'] : null); |
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$request->setSession($session); |
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return $request; |
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} |
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/** |
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* Takes a $_SERVER data array and extracts HTTP request headers. |
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* |
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* @param array $server |
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* |
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* @return array |
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*/ |
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public static function extractRequestHeaders(array $server) |
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{ |
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$headers = array(); |
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foreach ($server as $key => $value) { |
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if (substr($key, 0, 5) == 'HTTP_') { |
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$key = substr($key, 5); |
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$key = strtolower(str_replace('_', ' ', $key)); |
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$key = str_replace(' ', '-', ucwords($key)); |
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$headers[$key] = $value; |
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} |
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} |
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if (isset($server['CONTENT_TYPE'])) { |
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$headers['Content-Type'] = $server['CONTENT_TYPE']; |
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} |
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if (isset($server['CONTENT_LENGTH'])) { |
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$headers['Content-Length'] = $server['CONTENT_LENGTH']; |
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} |
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return $headers; |
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} |
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/** |
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* Clean up HTTP global vars for $_GET / $_REQUEST prior to bootstrapping |
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* Will also populate the $_GET['url'] var safely |
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* |
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* @param array $variables |
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* @return array Cleaned variables |
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*/ |
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public static function cleanEnvironment(array $variables) |
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{ |
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// IIS will sometimes generate this. |
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if (!empty($variables['_SERVER']['HTTP_X_ORIGINAL_URL'])) { |
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$variables['_SERVER']['REQUEST_URI'] = $variables['_SERVER']['HTTP_X_ORIGINAL_URL']; |
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} |
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// Override REQUEST_METHOD |
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if (isset($variables['_SERVER']['X-HTTP-Method-Override'])) { |
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$variables['_SERVER']['REQUEST_METHOD'] = $variables['_SERVER']['X-HTTP-Method-Override']; |
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} |
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// Prevent injection of url= querystring argument by prioritising any leading url argument |
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if (isset($variables['_SERVER']['QUERY_STRING']) && |
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preg_match('/^(?<url>url=[^&?]*)(?<query>.*[&?]url=.*)$/', $variables['_SERVER']['QUERY_STRING'], $results) |
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) { |
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$queryString = $results['query'].'&'.$results['url']; |
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parse_str($queryString, $variables['_GET']); |
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} |
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// Decode url from REQUEST_URI if not passed via $_GET['url'] |
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if (!isset($variables['_GET']['url'])) { |
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$url = $variables['_SERVER']['REQUEST_URI']; |
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// Querystring args need to be explicitly parsed |
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if (strpos($url, '?') !== false) { |
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list($url, $queryString) = explode('?', $url, 2); |
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parse_str($queryString); |
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} |
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// Ensure $_GET['url'] is set |
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$variables['_GET']['url'] = urldecode($url); |
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} |
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// Remove base folders from the URL if webroot is hosted in a subfolder |
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if (substr(strtolower($variables['_GET']['url']), 0, strlen(BASE_URL)) === strtolower(BASE_URL)) { |
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$variables['_GET']['url'] = substr($variables['_GET']['url'], strlen(BASE_URL)); |
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} |
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// Merge $_FILES into $_POST |
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$variables['_POST'] = array_merge((array)$variables['_POST'], (array)$variables['_FILES']); |
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// Merge $_POST, $_GET, and $_COOKIE into $_REQUEST |
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$variables['_REQUEST'] = array_merge( |
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(array)$variables['_GET'], |
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(array)$variables['_POST'], |
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(array)$variables['_COOKIE'] |
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); |
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return $variables; |
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} |
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} |
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sminnee /
silverstripe-framework
