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| <?php | |
| /** | |
| * PrivateBin | |
| * | |
| * a zero-knowledge paste bin | |
| * | |
| * @link https://github.com/PrivateBin/PrivateBin | |
| * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) | |
| * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License | |
| * @version 1.3.2 | |
| */ | |
| namespace PrivateBin; | |
| /** | |
| * Request | |
| * | |
| * parses request parameters and provides helper functions for routing | |
| */ | |
| class Request | |
| { | |
| /** | |
| * MIME type for JSON | |
| * | |
| * @const string | |
| */ | |
| const MIME_JSON = 'application/json'; | |
| /** | |
| * MIME type for HTML | |
| * | |
| * @const string | |
| */ | |
| const MIME_HTML = 'text/html'; | |
| /** | |
| * MIME type for XHTML | |
| * | |
| * @const string | |
| */ | |
| const MIME_XHTML = 'application/xhtml+xml'; | |
| /** | |
| * Input stream to use for PUT parameter parsing | |
| * | |
| * @access private | |
| * @var string | |
| */ | |
| private static $_inputStream = 'php://input'; | |
| /** | |
| * Operation to perform | |
| * | |
| * @access private | |
| * @var string | |
| */ | |
| private $_operation = 'view'; | |
| /** | |
| * Request parameters | |
| * | |
| * @access private | |
| * @var array | |
| */ | |
| private $_params = array(); | |
| /** | |
| * If we are in a JSON API context | |
| * | |
| * @access private | |
| * @var bool | |
| */ | |
| private $_isJsonApi = false; | |
| /** | |
| * Return the paste ID of the current paste. | |
| * | |
| * @access private | |
| * @return string | |
| */ | |
| private function getPasteId() | |
| { | |
| // RegEx to check for valid paste ID (16 base64 chars) | |
| $pasteIdRegEx = '/^[a-f0-9]{16}$/'; | |
| foreach ($_GET as $key => $value) { | |
| // only return if value is empty and key matches RegEx | |
| if (($value === '') and preg_match($pasteIdRegEx, $key, $match)) { | |
| return $match[0]; | |
| } | |
| } | |
| return 'invalid id'; | |
| } | |
| /** | |
| * Constructor | |
| * | |
| * @access public | |
| */ | |
| public function __construct() | |
| { | |
| // decide if we are in JSON API or HTML context | |
| $this->_isJsonApi = $this->_detectJsonRequest(); | |
| // parse parameters, depending on request type | |
| switch (array_key_exists('REQUEST_METHOD', $_SERVER) ? $_SERVER['REQUEST_METHOD'] : 'GET') { | |
| case 'DELETE': | |
| case 'PUT': | |
| case 'POST': | |
| $this->_params = Json::decode( | |
| file_get_contents(self::$_inputStream) | |
| ); | |
| break; | |
| default: | |
| $this->_params = $_GET; | |
| } | |
| if ( | |
| !array_key_exists('pasteid', $this->_params) && | |
| !array_key_exists('jsonld', $this->_params) && | |
| array_key_exists('QUERY_STRING', $_SERVER) && | |
| !empty($_SERVER['QUERY_STRING']) | |
| ) { | |
| $this->_params['pasteid'] = $this->getPasteId(); | |
| } | |
| // prepare operation, depending on current parameters | |
| if ( | |
| array_key_exists('ct', $this->_params) && | |
| !empty($this->_params['ct']) | |
| ) { | |
| $this->_operation = 'create'; | |
| } elseif (array_key_exists('pasteid', $this->_params) && !empty($this->_params['pasteid'])) { | |
| if (array_key_exists('deletetoken', $this->_params) && !empty($this->_params['deletetoken'])) { | |
| $this->_operation = 'delete'; | |
| } else { | |
| $this->_operation = 'read'; | |
| } | |
| } elseif (array_key_exists('jsonld', $this->_params) && !empty($this->_params['jsonld'])) { | |
| $this->_operation = 'jsonld'; | |
| } | |
| } | |
| /** | |
| * Get current operation | |
| * | |
| * @access public | |
| * @return string | |
| */ | |
| public function getOperation() | |
| { | |
| return $this->_operation; | |
| } | |
| /** | |
| * Get data of paste or comment | |
| * | |
| * @access public | |
| * @return array | |
| */ | |
| public function getData() | |
| { | |
| $data = array( | |
| 'adata' => $this->getParam('adata'), | |
| ); | |
| $required_keys = array('v', 'ct'); | |
| $meta = $this->getParam('meta'); | |
| if (empty($meta)) { | |
| $required_keys[] = 'pasteid'; | |
| $required_keys[] = 'parentid'; | |
| } else { | |
| $data['meta'] = $meta; | |
| } | |
| foreach ($required_keys as $key) { | |
| $data[$key] = $this->getParam($key); | |
| } | |
| // forcing a cast to int or float | |
| $data['v'] = $data['v'] + 0; | |
| return $data; | |
| } | |
| /** | |
| * Get a request parameter | |
| * | |
| * @access public | |
| * @param string $param | |
| * @param string $default | |
| * @return string | |
| */ | |
| public function getParam($param, $default = '') | |
| { | |
| return array_key_exists($param, $this->_params) ? | |
| $this->_params[$param] : $default; | |
| } | |
| /** | |
| * Get host as requested by the client | |
| * | |
| * @access public | |
| * @return string | |
| */ | |
| public function getHost() | |
| { | |
| return array_key_exists('HTTP_HOST', $_SERVER) ? | |
| htmlspecialchars($_SERVER['HTTP_HOST']) : | |
| 'localhost'; | |
| } | |
| /** | |
| * Get request URI | |
| * | |
| * @access public | |
| * @return string | |
| */ | |
| public function getRequestUri() | |
| { | |
| return array_key_exists('REQUEST_URI', $_SERVER) ? | |
| htmlspecialchars( | |
| parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH) | |
| ) : '/'; | |
| } | |
| /** | |
| * If we are in a JSON API context | |
| * | |
| * @access public | |
| * @return bool | |
| */ | |
| public function isJsonApiCall() | |
| { | |
| return $this->_isJsonApi; | |
| } | |
| /** | |
| * Override the default input stream source, used for unit testing | |
| * | |
| * @param string $input | |
| */ | |
| public static function setInputStream($input) | |
| { | |
| self::$_inputStream = $input; | |
| } | |
| /** | |
| * Detect the clients supported media type and decide if its a JSON API call or not | |
| * | |
| * Adapted from: https://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447 | |
| * | |
| * @access private | |
| * @return bool | |
| */ | |
| private function _detectJsonRequest() | |
| { | |
| $hasAcceptHeader = array_key_exists('HTTP_ACCEPT', $_SERVER); | |
| $acceptHeader = $hasAcceptHeader ? $_SERVER['HTTP_ACCEPT'] : ''; | |
| // simple cases | |
| if ( | |
| (array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) && | |
| $_SERVER['HTTP_X_REQUESTED_WITH'] == 'JSONHttpRequest') || | |
| ($hasAcceptHeader && | |
| strpos($acceptHeader, self::MIME_JSON) !== false && | |
| strpos($acceptHeader, self::MIME_HTML) === false && | |
| strpos($acceptHeader, self::MIME_XHTML) === false) | |
| ) { | |
| return true; | |
| } | |
| // advanced case: media type negotiation | |
| $mediaTypes = array(); | |
| if ($hasAcceptHeader) { | |
| $mediaTypeRanges = explode(',', trim($acceptHeader)); | |
| foreach ($mediaTypeRanges as $mediaTypeRange) { | |
| if (preg_match( | |
| '#(\*/\*|[a-z\-]+/[a-z\-+*]+(?:\s*;\s*[^q]\S*)*)(?:\s*;\s*q\s*=\s*(0(?:\.\d{0,3})|1(?:\.0{0,3})))?#', | |
| trim($mediaTypeRange), $match | |
| )) { | |
| if (!isset($match[2])) { | |
| $match[2] = '1.0'; | |
| } else { | |
| $match[2] = (string) floatval($match[2]); | |
| } | |
| if (!isset($mediaTypes[$match[2]])) { | |
| $mediaTypes[$match[2]] = array(); | |
| } | |
| $mediaTypes[$match[2]][] = strtolower($match[1]); | |
| } | |
| } | |
| krsort($mediaTypes); | |
| foreach ($mediaTypes as $acceptedQuality => $acceptedValues) { | |
| if ($acceptedQuality === 0.0) { | |
| continue; | |
| } | |
| foreach ($acceptedValues as $acceptedValue) { | |
| if ( | |
| strpos($acceptedValue, self::MIME_HTML) === 0 || | |
| strpos($acceptedValue, self::MIME_XHTML) === 0 | |
| ) { | |
| return false; | |
| } elseif (strpos($acceptedValue, self::MIME_JSON) === 0) { | |
| return true; | |
| } | |
| } | |
| } | |
| } | |
| return false; | |
| } | |
| } |