735 lines
23 KiB
PHP
735 lines
23 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 0.20
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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 = '0.20';
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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 array
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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 $_conf = array(
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'model' => 'zerobin_data',
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);
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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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* data storage model
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*
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* @access private
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* @var zerobin_abstract
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*/
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private $_model;
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/**
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* constructor
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*
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* initializes and runs ZeroBin
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*
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* @access public
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* @return void
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*/
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public function __construct()
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{
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if (version_compare(PHP_VERSION, '5.2.6') < 0)
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{
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throw new Exception(i18n::_('ZeroBin requires php 5.2.6 or above to work. Sorry.'), 1);
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}
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// in case stupid admin has left magic_quotes enabled in php.ini
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if (get_magic_quotes_gpc())
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{
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$_POST = array_map('filter::stripslashes_deep', $_POST);
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$_GET = array_map('filter::stripslashes_deep', $_GET);
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$_COOKIE = array_map('filter::stripslashes_deep', $_COOKIE);
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}
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// load config from ini file
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$this->_init();
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// create new paste or comment
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if (
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(array_key_exists('data', $_POST) && !empty($_POST['data'])) ||
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(array_key_exists('attachment', $_POST) && !empty($_POST['attachment']))
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)
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{
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$this->_create();
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}
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// delete an existing paste
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elseif (!empty($_GET['deletetoken']) && !empty($_GET['pasteid']))
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{
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$this->_delete($_GET['pasteid'], $_GET['deletetoken']);
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}
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// display an existing paste
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elseif (!empty($_SERVER['QUERY_STRING']))
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{
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$this->_read($_SERVER['QUERY_STRING']);
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}
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// output JSON or HTML
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if (strlen($this->_json))
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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 = parse_ini_file(PATH . 'cfg' . DIRECTORY_SEPARATOR . 'conf.ini', true);
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foreach (array('main', 'model') as $section) {
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if (!array_key_exists($section, $this->_conf)) {
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throw new Exception(i18n::_('ZeroBin requires configuration section [%s] to be present in configuration file.', $section), 2);
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}
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}
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$this->_model = $this->_conf['model']['class'];
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}
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/**
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* get the model, create one if needed
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*
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* @access private
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* @return zerobin_abstract
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*/
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private function _model()
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{
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// if needed, initialize the model
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if(is_string($this->_model)) {
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$this->_model = forward_static_call(
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array($this->_model, 'getInstance'),
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$this->_conf['model_options']
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);
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}
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return $this->_model;
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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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* 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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$has_attachment = array_key_exists('attachment', $_POST);
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$has_attachmentname = $has_attachment && array_key_exists('attachmentname', $_POST) && !empty($_POST['attachmentname']);
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$data = array_key_exists('data', $_POST) ? $_POST['data'] : '';
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$attachment = $has_attachment ? $_POST['attachment'] : '';
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$attachmentname = $has_attachmentname ? $_POST['attachmentname'] : '';
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// Make sure last paste from the IP address was more than X seconds ago.
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trafficlimiter::setLimit($this->_conf['traffic']['limit']);
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trafficlimiter::setPath($this->_conf['traffic']['dir']);
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$ipKey = 'REMOTE_ADDR';
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if (array_key_exists('header', $this->_conf['traffic']))
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{
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$header = 'HTTP_' . $this->_conf['traffic']['header'];
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if (array_key_exists($header, $_SERVER) && !empty($_SERVER[$header]))
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{
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$ipKey = $header;
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}
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}
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if (!trafficlimiter::canPass($_SERVER[$ipKey]))
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{
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$this->_return_message(
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1,
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i18n::_(
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'Please wait %d seconds between each post.',
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$this->_conf['traffic']['limit']
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)
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);
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return;
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}
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// Make sure content is not too big.
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$sizelimit = (int) $this->_getMainConfig('sizelimit', 2097152);
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if (strlen($data) + strlen($attachment) + strlen($attachmentname) > $sizelimit)
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{
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$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::size_humanreadable($sizelimit)
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)
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);
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return;
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}
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// Make sure format is correct.
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if (!sjcl::isValid($data)) return $this->_return_message(1, 'Invalid data.');
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// Make sure attachments are enabled and format is correct.
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if($has_attachment)
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{
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if (
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!$this->_getMainConfig('fileupload', false) ||
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!sjcl::isValid($attachment) ||
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!($has_attachmentname && sjcl::isValid($attachmentname))
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) $this->_return_message(1, 'Invalid attachment.');
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}
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// Read additional meta-information.
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$meta = array();
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// Read expiration date
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if (array_key_exists('expire', $_POST) && !empty($_POST['expire']))
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{
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$selected_expire = (string) $_POST['expire'];
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if (array_key_exists($selected_expire, $this->_conf['expire_options']))
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{
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$expire = $this->_conf['expire_options'][$selected_expire];
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}
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else
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{
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$expire = $this->_conf['expire_options'][$this->_conf['expire']['default']];
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}
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if ($expire > 0) $meta['expire_date'] = time() + $expire;
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}
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// Destroy the paste when it is read.
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if (array_key_exists('burnafterreading', $_POST) && !empty($_POST['burnafterreading']))
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{
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$burnafterreading = $_POST['burnafterreading'];
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if ($burnafterreading !== '0')
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{
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if ($burnafterreading !== '1') $error = true;
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$meta['burnafterreading'] = true;
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}
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}
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// Read open discussion flag.
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if (
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$this->_getMainConfig('discussion', true) &&
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array_key_exists('opendiscussion', $_POST) &&
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!empty($_POST['opendiscussion'])
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)
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{
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$opendiscussion = $_POST['opendiscussion'];
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if ($opendiscussion !== '0')
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{
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if ($opendiscussion !== '1') $error = true;
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$meta['opendiscussion'] = true;
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}
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}
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// Read formatter flag.
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if (array_key_exists('formatter', $_POST) && !empty($_POST['formatter']))
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{
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$formatter = $_POST['formatter'];
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if (!array_key_exists($formatter, $this->_conf['formatter_options']))
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{
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$formatter = $this->_getMainConfig('defaultformatter', 'syntaxhighlighting');
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}
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$meta['formatter'] = $formatter;
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}
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// You can't have an open discussion on a "Burn after reading" paste:
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if (isset($meta['burnafterreading'])) unset($meta['opendiscussion']);
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// Optional nickname for comments
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if (!empty($_POST['nickname']))
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{
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// Generation of the anonymous avatar (Vizhash):
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// If a nickname is provided, we generate a Vizhash.
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// (We assume that if the user did not enter a nickname, he/she wants
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// to be anonymous and we will not generate the vizhash.)
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$nick = $_POST['nickname'];
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if (!sjcl::isValid($nick))
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{
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$error = true;
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}
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else
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{
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$meta['nickname'] = $nick;
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$vz = new vizhash16x16();
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$pngdata = $vz->generate($_SERVER['REMOTE_ADDR']);
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if ($pngdata != '')
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{
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$meta['vizhash'] = 'data:image/png;base64,' . base64_encode($pngdata);
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}
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// Once the avatar is generated, we do not keep the IP address, nor its hash.
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}
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}
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if ($error)
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{
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$this->_return_message(1, 'Invalid data.');
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return;
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}
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// Add post date to meta.
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$meta['postdate'] = time();
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// We just want a small hash to avoid collisions:
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// Half-MD5 (64 bits) will do the trick
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$dataid = substr(hash('md5', $data), 0, 16);
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$storage = array('data' => $data);
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// Add meta-information only if necessary.
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if (count($meta)) $storage['meta'] = $meta;
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// The user posts a comment.
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if (
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!empty($_POST['parentid']) &&
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!empty($_POST['pasteid'])
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)
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{
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$pasteid = (string) $_POST['pasteid'];
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$parentid = (string) $_POST['parentid'];
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if (
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!filter::is_valid_paste_id($pasteid) ||
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!filter::is_valid_paste_id($parentid)
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)
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{
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$this->_return_message(1, 'Invalid data.');
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return;
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}
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// Comments do not expire (it's the paste that expires)
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unset($storage['expire_date']);
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unset($storage['opendiscussion']);
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// Make sure paste exists.
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if (
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!$this->_model()->exists($pasteid)
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)
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{
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$this->_return_message(1, 'Invalid data.');
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return;
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}
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// Make sure the discussion is opened in this paste.
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$paste = $this->_model()->read($pasteid);
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if (
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!$paste->meta->opendiscussion
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)
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{
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$this->_return_message(1, 'Invalid data.');
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return;
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}
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// Check for improbable collision.
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if (
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$this->_model()->existsComment($pasteid, $parentid, $dataid)
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)
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{
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$this->_return_message(1, 'You are unlucky. Try again.');
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return;
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}
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// New comment
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if (
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$this->_model()->createComment($pasteid, $parentid, $dataid, $storage) === false
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)
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{
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$this->_return_message(1, 'Error saving comment. Sorry.');
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return;
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}
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// 0 = no error
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$this->_return_message(0, $dataid);
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return;
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}
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// The user posts a standard paste.
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else
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{
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// Check for improbable collision.
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if (
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$this->_model()->exists($dataid)
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)
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{
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$this->_return_message(1, 'You are unlucky. Try again.');
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return;
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}
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// Add attachment and its name, if one was sent
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if ($has_attachment) $storage['attachment'] = $attachment;
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if ($has_attachmentname) $storage['attachmentname'] = $attachmentname;
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// New paste
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if (
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$this->_model()->create($dataid, $storage) === false
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) {
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$this->_return_message(1, 'Error saving paste. Sorry.');
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return;
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}
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// Generate the "delete" token.
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// The token is the hmac of the pasteid signed with the server salt.
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// The paste can be delete by calling http://example.com/zerobin/?pasteid=<pasteid>&deletetoken=<deletetoken>
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$deletetoken = hash_hmac('sha1', $dataid, serversalt::get());
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// 0 = no error
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$this->_return_message(0, $dataid, array('deletetoken' => $deletetoken));
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return;
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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, $deletetoken)
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{
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// Is this a valid paste identifier?
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if (!filter::is_valid_paste_id($dataid))
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{
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$this->_error = 'Invalid paste ID.';
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return;
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}
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// Check that paste exists.
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if (!$this->_model()->exists($dataid))
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{
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$this->_error = self::GENERIC_ERROR;
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return;
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}
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// Get the paste itself.
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$paste = $this->_model()->read($dataid);
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// See if paste has expired.
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if (
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isset($paste->meta->expire_date) &&
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$paste->meta->expire_date < time()
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)
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{
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// Delete the paste
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$this->_model()->delete($dataid);
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$this->_error = self::GENERIC_ERROR;
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return;
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}
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if ($deletetoken == 'burnafterreading') {
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if (
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isset($paste->meta->burnafterreading) &&
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$paste->meta->burnafterreading
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)
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{
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// Delete the paste
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$this->_model()->delete($dataid);
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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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return;
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}
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// Make sure token is valid.
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serversalt::setPath($this->_conf['traffic']['dir']);
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if (!filter::slow_equals($deletetoken, hash_hmac('sha1', $dataid, serversalt::get())))
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{
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$this->_error = 'Wrong deletion token. Paste was not deleted.';
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return;
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}
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// Paste exists and deletion token is valid: Delete the paste.
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$this->_model()->delete($dataid);
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$this->_status = 'Paste was properly deleted.';
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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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$isJson = false;
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if (($pos = strpos($dataid, '&json')) !== false) {
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$isJson = true;
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$dataid = substr($dataid, 0, $pos);
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}
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// Is this a valid paste identifier?
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if (!filter::is_valid_paste_id($dataid))
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{
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$this->_error = 'Invalid paste ID.';
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return;
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}
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// Check that paste exists.
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if ($this->_model()->exists($dataid))
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{
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// Get the paste itself.
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$paste = $this->_model()->read($dataid);
|
|
|
|
// See if paste has expired.
|
|
if (
|
|
isset($paste->meta->expire_date) &&
|
|
$paste->meta->expire_date < time()
|
|
)
|
|
{
|
|
// Delete the paste
|
|
$this->_model()->delete($dataid);
|
|
$this->_error = self::GENERIC_ERROR;
|
|
}
|
|
// If no error, return the paste.
|
|
else
|
|
{
|
|
// We kindly provide the remaining time before expiration (in seconds)
|
|
if (
|
|
property_exists($paste->meta, 'expire_date')
|
|
) $paste->meta->remaining_time = $paste->meta->expire_date - time();
|
|
|
|
// The paste itself is the first in the list of encrypted messages.
|
|
$messages = array($paste);
|
|
|
|
// If it's a discussion, get all comments.
|
|
if (
|
|
property_exists($paste->meta, 'opendiscussion') &&
|
|
$paste->meta->opendiscussion
|
|
)
|
|
{
|
|
$messages = array_merge(
|
|
$messages,
|
|
$this->_model()->readComments($dataid)
|
|
);
|
|
}
|
|
|
|
// set formatter for for the view.
|
|
if (!property_exists($paste->meta, 'formatter'))
|
|
{
|
|
// support < 0.21 syntax highlighting
|
|
if (property_exists($paste->meta, 'syntaxcoloring') && $paste->meta->syntaxcoloring === true)
|
|
{
|
|
$paste->meta->formatter = 'syntaxhighlighting';
|
|
}
|
|
else
|
|
{
|
|
$paste->meta->formatter = $this->_getMainConfig('defaultformatter', 'syntaxhighlighting');
|
|
}
|
|
}
|
|
|
|
$this->_data = json_encode($messages);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$this->_error = self::GENERIC_ERROR;
|
|
}
|
|
if ($isJson)
|
|
{
|
|
if (strlen($this->_error))
|
|
{
|
|
$this->_return_message(1, $this->_error);
|
|
}
|
|
else
|
|
{
|
|
$this->_return_message(0, $dataid, array('messages' => $messages));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Display ZeroBin frontend.
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
private function _view()
|
|
{
|
|
// set headers to disable caching
|
|
$time = gmdate('D, d M Y H:i:s \G\M\T');
|
|
header('Cache-Control: no-store, no-cache, must-revalidate');
|
|
header('Pragma: no-cache');
|
|
header('Expires: ' . $time);
|
|
header('Last-Modified: ' . $time);
|
|
header('Vary: Accept');
|
|
|
|
// label all the expiration options
|
|
$expire = array();
|
|
foreach ($this->_conf['expire_options'] as $time => $seconds)
|
|
{
|
|
$expire[$time] = ($seconds == 0) ? i18n::_(ucfirst($time)): filter::time_humanreadable($time);
|
|
}
|
|
|
|
// translate all the formatter options
|
|
$formatters = array_map(array('i18n', 'translate'), $this->_conf['formatter_options']);
|
|
|
|
// set language cookie if that functionality was enabled
|
|
$languageselection = '';
|
|
if ($this->_getMainConfig('languageselection', false))
|
|
{
|
|
$languageselection = i18n::getLanguage();
|
|
setcookie('lang', $languageselection);
|
|
}
|
|
|
|
$page = new RainTPL;
|
|
$page::$path_replace = false;
|
|
// we escape it here because ENT_NOQUOTES can't be used in RainTPL templates
|
|
$page->assign('CIPHERDATA', htmlspecialchars($this->_data, ENT_NOQUOTES));
|
|
$page->assign('ERROR', i18n::_($this->_error));
|
|
$page->assign('STATUS', i18n::_($this->_status));
|
|
$page->assign('VERSION', self::VERSION);
|
|
$page->assign('DISCUSSION', $this->_getMainConfig('discussion', true));
|
|
$page->assign('OPENDISCUSSION', $this->_getMainConfig('opendiscussion', true));
|
|
$page->assign('MARKDOWN', array_key_exists('markdown', $formatters));
|
|
$page->assign('SYNTAXHIGHLIGHTING', array_key_exists('syntaxhighlighting', $formatters));
|
|
$page->assign('SYNTAXHIGHLIGHTINGTHEME', $this->_getMainConfig('syntaxhighlightingtheme', ''));
|
|
$page->assign('FORMATTER', $formatters);
|
|
$page->assign('FORMATTERDEFAULT', $this->_getMainConfig('defaultformatter', 'syntaxhighlighting'));
|
|
$page->assign('NOTICE', i18n::_($this->_getMainConfig('notice', '')));
|
|
$page->assign('BURNAFTERREADINGSELECTED', $this->_getMainConfig('burnafterreadingselected', false));
|
|
$page->assign('PASSWORD', $this->_getMainConfig('password', true));
|
|
$page->assign('FILEUPLOAD', $this->_getMainConfig('fileupload', false));
|
|
$page->assign('BASE64JSVERSION', $this->_getMainConfig('base64version', '2.1.9'));
|
|
$page->assign('LANGUAGESELECTION', $languageselection);
|
|
$page->assign('LANGUAGES', i18n::getLanguageLabels(i18n::getAvailableLanguages()));
|
|
$page->assign('EXPIRE', $expire);
|
|
$page->assign('EXPIREDEFAULT', $this->_conf['expire']['default']);
|
|
$page->draw($this->_getMainConfig('template', 'page'));
|
|
}
|
|
|
|
/**
|
|
* get configuration option from [main] section, optionally set a default
|
|
*
|
|
* @access private
|
|
* @param string $option
|
|
* @param mixed $default (optional)
|
|
* @return mixed
|
|
*/
|
|
private function _getMainConfig($option, $default = false)
|
|
{
|
|
return array_key_exists($option, $this->_conf['main']) ?
|
|
$this->_conf['main'][$option] :
|
|
$default;
|
|
}
|
|
|
|
/**
|
|
* return JSON encoded message and exit
|
|
*
|
|
* @access private
|
|
* @param bool $status
|
|
* @param string $message
|
|
* @param array $other
|
|
* @return void
|
|
*/
|
|
private function _return_message($status, $message, $other = array())
|
|
{
|
|
$result = array('status' => $status);
|
|
if ($status)
|
|
{
|
|
$result['message'] = i18n::_($message);
|
|
}
|
|
else
|
|
{
|
|
$result['id'] = $message;
|
|
}
|
|
$result += $other;
|
|
$this->_json = json_encode($result);
|
|
}
|
|
}
|