453 lines
14 KiB
PHP
453 lines
14 KiB
PHP
<?php
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/**
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* ZeroBin
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*
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* a zero-knowledge paste bin
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*
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* @link http://sebsauvage.net/wiki/doku.php?id=php:zerobin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 0.21.1
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*/
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/**
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* zerobin
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*
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* Controller, puts it all together.
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*/
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class zerobin
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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 = '0.21.1';
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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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* data
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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 $_data = '';
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/**
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* formatter
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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 $_formatter = 'plaintext';
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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 $_request;
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/**
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* constructor
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*
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* initializes and runs ZeroBin
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*
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* @access public
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* @return void
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*/
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public function __construct()
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{
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if (version_compare(PHP_VERSION, '5.2.6') < 0)
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{
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throw new Exception(i18n::_('ZeroBin requires php 5.2.6 or above to work. Sorry.'), 1);
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}
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// load config from ini file
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$this->_init();
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switch ($this->_request->getOperation())
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{
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case 'create':
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$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($this->_request->getParam('pasteid'));
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break;
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}
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// output JSON or HTML
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if ($this->_request->isJsonApiCall())
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{
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header('Content-type: application/json');
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echo $this->_json;
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}
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else
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{
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$this->_view();
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}
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}
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/**
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* initialize zerobin
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*
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* @access private
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* @return void
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*/
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private function _init()
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{
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foreach (array('cfg', 'lib') as $dir)
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{
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if (!is_file(PATH . $dir . DIRECTORY_SEPARATOR . '.htaccess')) file_put_contents(
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PATH . $dir . DIRECTORY_SEPARATOR . '.htaccess',
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'Allow from none' . PHP_EOL .
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'Deny from all'. PHP_EOL,
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LOCK_EX
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);
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}
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$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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}
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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 SJCL encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* attachment = json encoded SJCL 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 SJCL encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* nickname (optional) = in discussion, encoded SJCL 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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$error = false;
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// Ensure last paste from visitors IP address was more than configured amount of seconds ago.
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trafficlimiter::setConfiguration($this->_conf);
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if (!trafficlimiter::canPass()) return $this->_return_message(
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1, i18n::_(
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'Please wait %d seconds between each post.',
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$this->_conf->getKey('limit', 'traffic')
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)
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);
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$data = $this->_request->getParam('data');
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$attachment = $this->_request->getParam('attachment');
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$attachmentname = $this->_request->getParam('attachmentname');
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// Ensure content is not too big.
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$sizelimit = $this->_conf->getKey('sizelimit');
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if (
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strlen($data) + strlen($attachment) + strlen($attachmentname) > $sizelimit
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) return $this->_return_message(
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1,
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i18n::_(
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'Paste is limited to %s of encrypted data.',
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filter::size_humanreadable($sizelimit)
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)
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);
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// The user posts a comment.
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$pasteid = $this->_request->getParam('pasteid');
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$parentid = $this->_request->getParam('parentid');
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if (!empty($pasteid) && !empty($parentid))
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{
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$paste = $this->_model->getPaste($pasteid);
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if ($paste->exists()) {
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try {
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$comment = $paste->getComment($parentid);
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$nickname = $this->_request->getParam('nickname');
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if (!empty($nickname)) $comment->setNickname($nickname);
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$comment->setData($data);
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$comment->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, $comment->getId());
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}
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else
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{
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$this->_return_message(1, '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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{
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$paste = $this->_model->getPaste();
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try {
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if (!empty($attachment))
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{
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$paste->setAttachment($attachment);
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if (!empty($attachmentname))
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$paste->setAttachmentName($attachmentname);
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}
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$expire = $this->_request->getParam('expire');
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if (!empty($expire)) $paste->setExpiration($expire);
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$burnafterreading = $this->_request->getParam('burnafterreading');
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if (!empty($burnafterreading)) $paste->setBurnafterreading($burnafterreading);
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$opendiscussion = $this->_request->getParam('opendiscussion');
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if (!empty($opendiscussion)) $paste->setOpendiscussion($opendiscussion);
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$formatter = $this->_request->getParam('formatter');
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if (!empty($formatter)) $paste->setFormatter($formatter);
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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 $deletetoken
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* @return void
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*/
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private function _delete($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 ($paste->exists())
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{
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// accessing this property ensures that the paste would be
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// deleted if it has already expired
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$burnafterreading = $paste->isBurnafterreading();
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if ($deletetoken == 'burnafterreading')
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{
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if ($burnafterreading)
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{
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$paste->delete();
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$this->_return_message(0, $dataid);
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}
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else
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{
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$this->_return_message(1, 'Paste is not of burn-after-reading type.');
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}
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}
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else
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{
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// Make sure the token is valid.
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serversalt::setPath($this->_conf->getKey('dir', 'traffic'));
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if (filter::slow_equals($deletetoken, $paste->getDeleteToken()))
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{
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// Paste exists and deletion token is valid: Delete the paste.
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$paste->delete();
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$this->_status = 'Paste was properly deleted.';
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}
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else
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{
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$this->_error = 'Wrong deletion token. Paste was not deleted.';
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}
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}
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}
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else
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{
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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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}
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/**
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* Read an existing paste or comment
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*
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* @access private
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* @param string $dataid
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* @return void
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*/
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private function _read($dataid)
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{
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try {
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$paste = $this->_model->getPaste($dataid);
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if ($paste->exists())
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{
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// The paste itself is the first in the list of encrypted messages.
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$messages = array_merge(
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array($paste->get()),
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$paste->getComments()
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);
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$this->_data = json_encode($messages);
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}
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else
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{
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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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{
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if (strlen($this->_error))
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{
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$this->_return_message(1, $this->_error);
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}
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else
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{
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$this->_return_message(0, $dataid, array('messages' => $messages));
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}
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}
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}
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/**
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* Display ZeroBin frontend.
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*
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* @access private
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* @return void
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*/
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private function _view()
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{
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// set headers to disable caching
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$time = gmdate('D, d M Y H:i:s \G\M\T');
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header('Cache-Control: no-store, no-cache, must-revalidate');
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header('Pragma: no-cache');
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header('Expires: ' . $time);
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header('Last-Modified: ' . $time);
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header('Vary: Accept');
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// label all the expiration options
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$expire = array();
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foreach ($this->_conf->getSection('expire_options') as $time => $seconds)
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{
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$expire[$time] = ($seconds == 0) ? i18n::_(ucfirst($time)): filter::time_humanreadable($time);
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}
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// translate all the formatter options
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$formatters = array_map(array('i18n', 'translate'), $this->_conf->getSection('formatter_options'));
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// set language cookie if that functionality was enabled
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$languageselection = '';
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if ($this->_conf->getKey('languageselection'))
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{
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$languageselection = i18n::getLanguage();
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setcookie('lang', $languageselection);
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}
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$page = new RainTPL;
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$page::$path_replace = false;
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// we escape it here because ENT_NOQUOTES can't be used in RainTPL templates
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$page->assign('CIPHERDATA', htmlspecialchars($this->_data, ENT_NOQUOTES));
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$page->assign('ERROR', i18n::_($this->_error));
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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('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('BASE64JSVERSION', $this->_conf->getKey('base64version'));
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$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->draw($this->_conf->getKey('template'));
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}
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/**
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* return JSON encoded message and exit
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*
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* @access private
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* @param bool $status
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* @param string $message
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* @param array $other
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* @return void
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*/
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private function _return_message($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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{
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$result['message'] = i18n::_($message);
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}
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else
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{
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$result['id'] = $message;
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}
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$result += $other;
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$this->_json = json_encode($result);
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}
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}
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