316 lines
8.6 KiB
PHP
316 lines
8.6 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.5.0
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*/
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namespace PrivateBin;
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use Exception;
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/**
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* Request
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*
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* parses request parameters and provides helper functions for routing
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*/
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class Request
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{
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/**
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* MIME type for JSON
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*
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* @const string
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*/
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const MIME_JSON = 'application/json';
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/**
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* MIME type for HTML
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*
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* @const string
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*/
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const MIME_HTML = 'text/html';
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/**
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* MIME type for XHTML
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*
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* @const string
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*/
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const MIME_XHTML = 'application/xhtml+xml';
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/**
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* Input stream to use for PUT parameter parsing
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*
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* @access private
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* @var string
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*/
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private static $_inputStream = 'php://input';
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/**
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* Operation to perform
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*
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* @access private
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* @var string
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*/
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private $_operation = 'view';
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/**
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* Request parameters
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*
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* @access private
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* @var array
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*/
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private $_params = array();
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/**
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* If we are in a JSON API context
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*
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* @access private
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* @var bool
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*/
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private $_isJsonApi = false;
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/**
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* Return the paste ID of the current paste.
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*
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* @access private
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* @return string
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*/
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private function getPasteId()
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{
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// RegEx to check for valid paste ID (16 base64 chars)
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$pasteIdRegEx = '/^[a-f0-9]{16}$/';
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foreach ($_GET as $key => $value) {
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// only return if value is empty and key matches RegEx
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if (($value === '') and preg_match($pasteIdRegEx, $key, $match)) {
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return $match[0];
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}
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}
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return 'invalid id';
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}
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/**
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* Constructor
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*
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* @access public
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*/
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public function __construct()
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{
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// decide if we are in JSON API or HTML context
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$this->_isJsonApi = $this->_detectJsonRequest();
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// parse parameters, depending on request type
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switch (array_key_exists('REQUEST_METHOD', $_SERVER) ? $_SERVER['REQUEST_METHOD'] : 'GET') {
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case 'DELETE':
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case 'PUT':
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case 'POST':
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// it might be a creation or a deletion, the latter is detected below
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$this->_operation = 'create';
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try {
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$this->_params = Json::decode(
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file_get_contents(self::$_inputStream)
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);
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} catch (Exception $e) {
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// ignore error, $this->_params will remain empty
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}
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break;
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default:
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$this->_params = $_GET;
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}
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if (
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!array_key_exists('pasteid', $this->_params) &&
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!array_key_exists('jsonld', $this->_params) &&
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!array_key_exists('link', $this->_params) &&
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array_key_exists('QUERY_STRING', $_SERVER) &&
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!empty($_SERVER['QUERY_STRING'])
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) {
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$this->_params['pasteid'] = $this->getPasteId();
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}
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// prepare operation, depending on current parameters
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if (array_key_exists('pasteid', $this->_params) && !empty($this->_params['pasteid'])) {
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if (array_key_exists('deletetoken', $this->_params) && !empty($this->_params['deletetoken'])) {
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$this->_operation = 'delete';
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} elseif ($this->_operation != 'create') {
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$this->_operation = 'read';
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}
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} elseif (array_key_exists('jsonld', $this->_params) && !empty($this->_params['jsonld'])) {
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$this->_operation = 'jsonld';
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} elseif (array_key_exists('link', $this->_params) && !empty($this->_params['link'])) {
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if (strpos($this->getRequestUri(), '/shortenviayourls') !== false) {
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$this->_operation = 'yourlsproxy';
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}
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}
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}
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/**
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* Get current operation
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*
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* @access public
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* @return string
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*/
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public function getOperation()
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{
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return $this->_operation;
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}
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/**
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* Get data of paste or comment
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*
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* @access public
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* @return array
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*/
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public function getData()
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{
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$data = array(
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'adata' => $this->getParam('adata'),
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);
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$required_keys = array('v', 'ct');
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$meta = $this->getParam('meta');
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if (empty($meta)) {
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$required_keys[] = 'pasteid';
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$required_keys[] = 'parentid';
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} else {
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$data['meta'] = $meta;
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}
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foreach ($required_keys as $key) {
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$data[$key] = $this->getParam($key, $key == 'v' ? 1 : '');
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}
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// forcing a cast to int or float
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$data['v'] = $data['v'] + 0;
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return $data;
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}
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/**
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* Get a request parameter
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*
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* @access public
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* @param string $param
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* @param string $default
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* @return string
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*/
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public function getParam($param, $default = '')
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{
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return array_key_exists($param, $this->_params) ?
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$this->_params[$param] : $default;
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}
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/**
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* Get host as requested by the client
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*
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* @access public
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* @return string
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*/
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public function getHost()
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{
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return array_key_exists('HTTP_HOST', $_SERVER) ?
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htmlspecialchars($_SERVER['HTTP_HOST']) :
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'localhost';
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}
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/**
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* Get request URI
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*
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* @access public
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* @return string
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*/
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public function getRequestUri()
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{
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return array_key_exists('REQUEST_URI', $_SERVER) ?
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htmlspecialchars(
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parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)
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) : '/';
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}
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/**
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* If we are in a JSON API context
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*
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* @access public
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* @return bool
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*/
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public function isJsonApiCall()
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{
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return $this->_isJsonApi;
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}
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/**
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* Override the default input stream source, used for unit testing
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*
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* @param string $input
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*/
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public static function setInputStream($input)
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{
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self::$_inputStream = $input;
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}
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/**
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* Detect the clients supported media type and decide if its a JSON API call or not
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*
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* Adapted from: https://stackoverflow.com/questions/3770513/detect-browser-language-in-php#3771447
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*
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* @access private
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* @return bool
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*/
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private function _detectJsonRequest()
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{
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$hasAcceptHeader = array_key_exists('HTTP_ACCEPT', $_SERVER);
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$acceptHeader = $hasAcceptHeader ? $_SERVER['HTTP_ACCEPT'] : '';
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// simple cases
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if (
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(array_key_exists('HTTP_X_REQUESTED_WITH', $_SERVER) &&
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$_SERVER['HTTP_X_REQUESTED_WITH'] == 'JSONHttpRequest') ||
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($hasAcceptHeader &&
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strpos($acceptHeader, self::MIME_JSON) !== false &&
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strpos($acceptHeader, self::MIME_HTML) === false &&
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strpos($acceptHeader, self::MIME_XHTML) === false)
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) {
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return true;
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}
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// advanced case: media type negotiation
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$mediaTypes = array();
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if ($hasAcceptHeader) {
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$mediaTypeRanges = explode(',', trim($acceptHeader));
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foreach ($mediaTypeRanges as $mediaTypeRange) {
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if (preg_match(
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'#(\*/\*|[a-z\-]+/[a-z\-+*]+(?:\s*;\s*[^q]\S*)*)(?:\s*;\s*q\s*=\s*(0(?:\.\d{0,3})|1(?:\.0{0,3})))?#',
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trim($mediaTypeRange), $match
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)) {
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if (!isset($match[2])) {
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$match[2] = '1.0';
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} else {
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$match[2] = (string) floatval($match[2]);
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}
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if (!isset($mediaTypes[$match[2]])) {
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$mediaTypes[$match[2]] = array();
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}
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$mediaTypes[$match[2]][] = strtolower($match[1]);
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}
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}
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krsort($mediaTypes);
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foreach ($mediaTypes as $acceptedQuality => $acceptedValues) {
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if ($acceptedQuality === '0.0') {
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continue;
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}
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foreach ($acceptedValues as $acceptedValue) {
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if (
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strpos($acceptedValue, self::MIME_HTML) === 0 ||
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strpos($acceptedValue, self::MIME_XHTML) === 0
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) {
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return false;
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} elseif (strpos($acceptedValue, self::MIME_JSON) === 0) {
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return true;
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}
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}
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}
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}
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return false;
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}
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}
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