486 lines
16 KiB
PHP
486 lines
16 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 1.4.0
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*/
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namespace PrivateBin;
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use Exception;
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use PrivateBin\Persistence\ServerSalt;
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use PrivateBin\Persistence\TrafficLimiter;
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/**
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* Controller
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*
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* Puts it all together.
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*/
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class Controller
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{
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/**
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* version
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*
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* @const string
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*/
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const VERSION = '1.4.0';
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/**
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* minimal required PHP version
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*
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* @const string
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*/
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const MIN_PHP_VERSION = '5.6.0';
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/**
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* show the same error message if the paste expired or does not exist
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*
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* @const string
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*/
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const GENERIC_ERROR = 'Paste does not exist, has expired or has been deleted.';
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/**
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* configuration
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*
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* @access private
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* @var Configuration
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*/
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private $_conf;
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/**
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* error message
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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 $_error = '';
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/**
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* status message
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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 $_status = '';
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/**
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* JSON message
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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 $_json = '';
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/**
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* Factory of instance models
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*
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* @access private
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* @var model
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*/
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private $_model;
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/**
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* request
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*
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* @access private
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* @var request
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*/
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private $_request;
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/**
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* URL base
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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 $_urlBase;
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/**
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* constructor
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*
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* initializes and runs PrivateBin
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*
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* @access public
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* @throws Exception
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*/
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public function __construct()
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{
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if (version_compare(PHP_VERSION, self::MIN_PHP_VERSION) < 0) {
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throw new Exception(I18n::_('%s requires php %s or above to work. Sorry.', I18n::_('PrivateBin'), self::MIN_PHP_VERSION), 1);
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}
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if (strlen(PATH) < 0 && substr(PATH, -1) !== DIRECTORY_SEPARATOR) {
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throw new Exception(I18n::_('%s requires the PATH to end in a "%s". Please update the PATH in your index.php.', I18n::_('PrivateBin'), DIRECTORY_SEPARATOR), 5);
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}
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// load config from ini file, initialize required classes
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$this->_init();
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switch ($this->_request->getOperation()) {
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case 'create':
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$this->_create();
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break;
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case 'delete':
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$this->_delete(
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$this->_request->getParam('pasteid'),
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$this->_request->getParam('deletetoken')
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);
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break;
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case 'read':
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$this->_read($this->_request->getParam('pasteid'));
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break;
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case 'jsonld':
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$this->_jsonld($this->_request->getParam('jsonld'));
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return;
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case 'yourlsproxy':
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$this->_yourlsproxy($this->_request->getParam('link'));
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break;
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}
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// output JSON or HTML
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if ($this->_request->isJsonApiCall()) {
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header('Content-type: ' . Request::MIME_JSON);
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE');
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header('Access-Control-Allow-Headers: X-Requested-With, Content-Type');
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echo $this->_json;
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} else {
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$this->_view();
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}
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}
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/**
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* initialize PrivateBin
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*
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* @access private
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* @throws Exception
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*/
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private function _init()
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{
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$this->_conf = new Configuration;
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$this->_model = new Model($this->_conf);
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$this->_request = new Request;
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$this->_urlBase = $this->_request->getRequestUri();
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// set default language
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$lang = $this->_conf->getKey('languagedefault');
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I18n::setLanguageFallback($lang);
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// force default language, if language selection is disabled and a default is set
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if (!$this->_conf->getKey('languageselection') && strlen($lang) == 2) {
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$_COOKIE['lang'] = $lang;
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setcookie('lang', $lang, 0, '', '', true);
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}
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}
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/**
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* Store new paste or comment
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*
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* POST contains one or both:
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* data = json encoded FormatV2 encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* attachment = json encoded FormatV2 encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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*
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* All optional data will go to meta information:
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* expire (optional) = expiration delay (never,5min,10min,1hour,1day,1week,1month,1year,burn) (default:never)
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* formatter (optional) = format to display the paste as (plaintext,syntaxhighlighting,markdown) (default:syntaxhighlighting)
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* burnafterreading (optional) = if this paste may only viewed once ? (0/1) (default:0)
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* opendiscusssion (optional) = is the discussion allowed on this paste ? (0/1) (default:0)
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* attachmentname = json encoded FormatV2 encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* nickname (optional) = in discussion, encoded FormatV2 encrypted text nickname of author of comment (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* parentid (optional) = in discussion, which comment this comment replies to.
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* pasteid (optional) = in discussion, which paste this comment belongs to.
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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 _create()
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{
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// Ensure last paste from visitors IP address was more than configured amount of seconds ago.
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ServerSalt::setStore($this->_model->getStore());
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TrafficLimiter::setConfiguration($this->_conf);
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TrafficLimiter::setStore($this->_model->getStore());
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try {
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TrafficLimiter::canPass();
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} catch (Exception $e) {
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$this->_return_message(1, $e->getMessage());
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return;
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}
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$data = $this->_request->getData();
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$isComment = array_key_exists('pasteid', $data) &&
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!empty($data['pasteid']) &&
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array_key_exists('parentid', $data) &&
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!empty($data['parentid']);
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if (!FormatV2::isValid($data, $isComment)) {
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$this->_return_message(1, I18n::_('Invalid data.'));
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return;
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}
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$sizelimit = $this->_conf->getKey('sizelimit');
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// Ensure content is not too big.
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if (strlen($data['ct']) > $sizelimit) {
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$this->_return_message(
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1,
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I18n::_(
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'Paste is limited to %s of encrypted data.',
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Filter::formatHumanReadableSize($sizelimit)
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)
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);
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return;
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}
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// The user posts a comment.
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if ($isComment) {
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$paste = $this->_model->getPaste($data['pasteid']);
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if ($paste->exists()) {
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try {
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$comment = $paste->getComment($data['parentid']);
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$comment->setData($data);
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$comment->store();
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} catch (Exception $e) {
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$this->_return_message(1, $e->getMessage());
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return;
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}
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$this->_return_message(0, $comment->getId());
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} else {
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$this->_return_message(1, I18n::_('Invalid data.'));
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}
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}
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// The user posts a standard paste.
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else {
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$this->_model->purge();
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$paste = $this->_model->getPaste();
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try {
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$paste->setData($data);
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$paste->store();
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} catch (Exception $e) {
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return $this->_return_message(1, $e->getMessage());
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}
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$this->_return_message(0, $paste->getId(), array('deletetoken' => $paste->getDeleteToken()));
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}
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}
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/**
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* Delete an existing paste
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*
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* @access private
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* @param string $dataid
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* @param string $deletetoken
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*/
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private function _delete($dataid, $deletetoken)
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{
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try {
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$paste = $this->_model->getPaste($dataid);
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if ($paste->exists()) {
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// accessing this method ensures that the paste would be
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// deleted if it has already expired
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$paste->get();
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if (hash_equals($paste->getDeleteToken(), $deletetoken)) {
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// Paste exists and deletion token is valid: Delete the paste.
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$paste->delete();
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$this->_status = 'Paste was properly deleted.';
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} else {
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$this->_error = 'Wrong deletion token. Paste was not deleted.';
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}
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} else {
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$this->_error = self::GENERIC_ERROR;
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}
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} catch (Exception $e) {
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$this->_error = $e->getMessage();
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}
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if ($this->_request->isJsonApiCall()) {
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if (strlen($this->_error)) {
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$this->_return_message(1, $this->_error);
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} else {
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$this->_return_message(0, $dataid);
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}
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}
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}
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/**
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* Read an existing paste or comment, only allowed via a JSON API call
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*
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* @access private
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* @param string $dataid
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*/
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private function _read($dataid)
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{
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if (!$this->_request->isJsonApiCall()) {
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return;
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}
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try {
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$paste = $this->_model->getPaste($dataid);
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if ($paste->exists()) {
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$data = $paste->get();
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if (array_key_exists('salt', $data['meta'])) {
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unset($data['meta']['salt']);
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}
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$this->_return_message(0, $dataid, (array) $data);
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} else {
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$this->_return_message(1, self::GENERIC_ERROR);
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}
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} catch (Exception $e) {
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$this->_return_message(1, $e->getMessage());
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}
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}
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/**
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* Display frontend.
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*
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* @access private
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*/
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private function _view()
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{
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// set headers to disable caching
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$time = gmdate('D, d M Y H:i:s \G\M\T');
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header('Cache-Control: no-store, no-cache, no-transform, must-revalidate');
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header('Pragma: no-cache');
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header('Expires: ' . $time);
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header('Last-Modified: ' . $time);
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header('Vary: Accept');
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header('Content-Security-Policy: ' . $this->_conf->getKey('cspheader'));
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header('Cross-Origin-Resource-Policy: same-origin');
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header('Cross-Origin-Embedder-Policy: require-corp');
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// disabled, because it prevents links from a paste to the same site to
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// be opened. Didn't work with `same-origin-allow-popups` either.
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// See issue https://github.com/PrivateBin/PrivateBin/issues/970 for details.
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// header('Cross-Origin-Opener-Policy: same-origin');
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header('Permissions-Policy: browsing-topics=()');
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header('Referrer-Policy: no-referrer');
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header('X-Content-Type-Options: nosniff');
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header('X-Frame-Options: deny');
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header('X-XSS-Protection: 1; mode=block');
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// label all the expiration options
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$expire = array();
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foreach ($this->_conf->getSection('expire_options') as $time => $seconds) {
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$expire[$time] = ($seconds == 0) ? I18n::_(ucfirst($time)) : Filter::formatHumanReadableTime($time);
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}
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// translate all the formatter options
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$formatters = array_map('PrivateBin\\I18n::_', $this->_conf->getSection('formatter_options'));
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// set language cookie if that functionality was enabled
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$languageselection = '';
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if ($this->_conf->getKey('languageselection')) {
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$languageselection = I18n::getLanguage();
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setcookie('lang', $languageselection, 0, '', '', true);
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}
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// strip policies that are unsupported in meta tag
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$metacspheader = str_replace(
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array(
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'frame-ancestors \'none\'; ',
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'; sandbox allow-same-origin allow-scripts allow-forms allow-popups allow-modals allow-downloads',
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),
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'',
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$this->_conf->getKey('cspheader')
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);
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$page = new View;
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$page->assign('CSPHEADER', $metacspheader);
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$page->assign('ERROR', I18n::_($this->_error));
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if ($this->_request->getOperation() === 'yourlsproxy') {
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$page->assign('SHORTURL', $this->_status);
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$page->draw('yourlsproxy');
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return;
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}
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$page->assign('NAME', $this->_conf->getKey('name'));
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$page->assign('BASEPATH', I18n::_($this->_conf->getKey('basepath')));
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$page->assign('STATUS', I18n::_($this->_status));
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$page->assign('VERSION', self::VERSION);
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$page->assign('DISCUSSION', $this->_conf->getKey('discussion'));
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$page->assign('OPENDISCUSSION', $this->_conf->getKey('opendiscussion'));
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$page->assign('MARKDOWN', array_key_exists('markdown', $formatters));
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$page->assign('SYNTAXHIGHLIGHTING', array_key_exists('syntaxhighlighting', $formatters));
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$page->assign('SYNTAXHIGHLIGHTINGTHEME', $this->_conf->getKey('syntaxhighlightingtheme'));
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$page->assign('FORMATTER', $formatters);
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$page->assign('FORMATTERDEFAULT', $this->_conf->getKey('defaultformatter'));
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$page->assign('INFO', I18n::_(str_replace("'", '"', $this->_conf->getKey('info'))));
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$page->assign('NOTICE', I18n::_($this->_conf->getKey('notice')));
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$page->assign('BURNAFTERREADINGSELECTED', $this->_conf->getKey('burnafterreadingselected'));
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$page->assign('PASSWORD', $this->_conf->getKey('password'));
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$page->assign('FILEUPLOAD', $this->_conf->getKey('fileupload'));
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$page->assign('ZEROBINCOMPATIBILITY', $this->_conf->getKey('zerobincompatibility'));
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$page->assign('LANGUAGESELECTION', $languageselection);
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$page->assign('LANGUAGES', I18n::getLanguageLabels(I18n::getAvailableLanguages()));
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$page->assign('EXPIRE', $expire);
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$page->assign('EXPIREDEFAULT', $this->_conf->getKey('default', 'expire'));
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$page->assign('URLSHORTENER', $this->_conf->getKey('urlshortener'));
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$page->assign('QRCODE', $this->_conf->getKey('qrcode'));
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$page->assign('HTTPWARNING', $this->_conf->getKey('httpwarning'));
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$page->assign('HTTPSLINK', 'https://' . $this->_request->getHost() . $this->_request->getRequestUri());
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$page->assign('COMPRESSION', $this->_conf->getKey('compression'));
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$page->draw($this->_conf->getKey('template'));
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}
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/**
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* outputs requested JSON-LD context
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*
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* @access private
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* @param string $type
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*/
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private function _jsonld($type)
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{
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if (
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$type !== 'paste' && $type !== 'comment' &&
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$type !== 'pastemeta' && $type !== 'commentmeta'
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) {
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$type = '';
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}
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$content = '{}';
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$file = PUBLIC_PATH . DIRECTORY_SEPARATOR . 'js' . DIRECTORY_SEPARATOR . $type . '.jsonld';
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if (is_readable($file)) {
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$content = str_replace(
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'?jsonld=',
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$this->_urlBase . '?jsonld=',
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file_get_contents($file)
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);
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}
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header('Content-type: application/ld+json');
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET');
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echo $content;
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}
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/**
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* proxies link to YOURLS, updates status or error with response
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*
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* @access private
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* @param string $link
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*/
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private function _yourlsproxy($link)
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{
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$yourls = new YourlsProxy($this->_conf, $link);
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if ($yourls->isError()) {
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$this->_error = $yourls->getError();
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} else {
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$this->_status = $yourls->getUrl();
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}
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}
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/**
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* prepares JSON encoded status message
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*
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* @access private
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* @param int $status
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* @param string $message
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* @param array $other
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*/
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private function _return_message($status, $message, $other = array())
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{
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$result = array('status' => $status);
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if ($status) {
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$result['message'] = I18n::_($message);
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} else {
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$result['id'] = $message;
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$result['url'] = $this->_urlBase . '?' . $message;
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}
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$result += $other;
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$this->_json = Json::encode($result);
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}
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}
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