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<?php |
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namespace Psr7Middlewares\Utils; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Helper functions. |
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*/ |
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class Helpers |
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{ |
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private static $hash_equals; |
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/** |
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* helper function to fix paths '//' or '/./' or '/foo/../' in a path. |
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* |
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* @param string $path Path to resolve |
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* |
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* @return string |
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*/ |
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public static function fixPath($path) |
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{ |
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$path = str_replace('\\', '/', $path); //windows paths |
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$replace = ['#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#']; |
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do { |
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$path = preg_replace($replace, '/', $path, -1, $n); |
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} while ($n > 0); |
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return $path; |
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} |
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/** |
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* Join several pieces into a path. |
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* |
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* @param string |
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* ... |
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* |
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* @return string |
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*/ |
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public static function joinPath() |
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{ |
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return self::fixPath(implode('/', func_get_args())); |
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} |
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/** |
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* Check whether a request is or not ajax. |
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* |
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* @param RequestInterface $request |
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* |
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* @return bool |
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*/ |
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public static function isAjax(RequestInterface $request) |
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{ |
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return strtolower($request->getHeaderLine('X-Requested-With')) === 'xmlhttprequest'; |
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} |
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/** |
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* Check if a request is post or any similar method. |
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* |
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* @param RequestInterface $request |
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* |
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* @return bool |
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*/ |
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public static function isPost(RequestInterface $request) |
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{ |
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switch (strtoupper($request->getMethod())) { |
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case 'GET': |
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case 'HEAD': |
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case 'CONNECT': |
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case 'TRACE': |
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case 'OPTIONS': |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check whether a response is a redirection. |
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* |
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* @param ResponseInterface $response |
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* |
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* @return bool |
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*/ |
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public static function isRedirect(ResponseInterface $response) |
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{ |
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return in_array($response->getStatusCode(), [302, 301]); |
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} |
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/** |
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* Return the output buffer. |
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* |
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* @param int $level |
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* |
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* @return string |
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*/ |
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public static function getOutput($level) |
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{ |
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$output = ''; |
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while (ob_get_level() >= $level) { |
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$output .= ob_get_clean(); |
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} |
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return $output; |
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} |
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/** |
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* Very short timing attack safe string comparison for PHP < 5.6 |
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* http://php.net/manual/en/function.hash-equals.php#118384 |
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* |
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* @param string $a |
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* @param string $b |
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* |
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* @return bool |
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*/ |
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public static function hash_equals($a, $b) |
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{ |
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if (self::$hash_equals === null) { |
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self::$hash_equals = function_exists('hash_equals'); |
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} |
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if (self::$hash_equals) { |
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return hash_equals($a, $b); |
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} |
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return substr_count($a ^ $b, "\0") * 2 === strlen($a . $b); |
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} |
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} |
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oscarotero /
psr7-middlewares
