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<?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 1.1 |
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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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* PrivateBin |
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* |
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* Controller, puts it all together. |
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*/ |
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class PrivateBin |
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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 = '1.1'; |
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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 = '5.4.0'; |
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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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* 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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* does the paste expire |
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* |
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* @access private |
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* @var bool |
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*/ |
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private $_doesExpire = false; |
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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 $_urlBase; |
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/** |
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* constructor |
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* |
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* initializes and runs PrivateBin |
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* |
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* @access public |
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* @throws Exception |
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* @return void |
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*/ |
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public function __construct() |
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{ |
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if (version_compare(PHP_VERSION, self::MIN_PHP_VERSION) < 0) { |
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throw new Exception(I18n::_('%s requires php %s or above to work. Sorry.', I18n::_('PrivateBin'), self::MIN_PHP_VERSION), 1); |
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} |
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if (strlen(PATH) < 0 && substr(PATH, -1) !== DIRECTORY_SEPARATOR) { |
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throw new Exception(I18n::_('%s requires the PATH to end in a "%s". Please update the PATH in your index.php.', I18n::_('PrivateBin'), DIRECTORY_SEPARATOR), 5); |
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} |
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// load config from ini file, initialize required classes |
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$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($this->_request->getParam('jsonld')); |
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return; |
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} |
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// output JSON or HTML |
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if ($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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* @return void |
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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 = array_key_exists('REQUEST_URI', $_SERVER) ? |
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htmlspecialchars($_SERVER['REQUEST_URI']) : '/'; |
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ServerSalt::setPath($this->_conf->getKey('dir', 'traffic')); |
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// set default language |
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$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); |
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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 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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// 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()) { |
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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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} |
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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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) { |
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return $this->_return_message( |
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1, |
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I18n::_( |
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'Paste is limited to %s of encrypted data.', |
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Filter::formatHumanReadableSize($sizelimit) |
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) |
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); |
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} |
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// Ensure attachment did not get lost due to webserver limits or Suhosin |
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42 |
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if (strlen($attachmentname) > 0 && strlen($attachment) == 0) { |
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return $this->_return_message(1, 'Attachment missing in data received by server. Please check your webserver or suhosin configuration for maximum POST parameter limitations.'); |
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} |
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// The user posts a comment. |
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40 |
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$pasteid = $this->_request->getParam('pasteid'); |
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40 |
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$parentid = $this->_request->getParam('parentid'); |
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40 |
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if (!empty($pasteid) && !empty($parentid)) { |
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12 |
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$paste = $this->_model->getPaste($pasteid); |
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12 |
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if ($paste->exists()) { |
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try { |
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$comment = $paste->getComment($parentid); |
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8 |
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$nickname = $this->_request->getParam('nickname'); |
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8 |
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if (!empty($nickname)) { |
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8 |
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$comment->setNickname($nickname); |
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} |
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6 |
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$comment->setData($data); |
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$comment->store(); |
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8 |
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} catch (Exception $e) { |
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8 |
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return $this->_return_message(1, $e->getMessage()); |
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} |
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$this->_return_message(0, $comment->getId()); |
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} else { |
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4 |
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$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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28 |
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$this->_model->purge(); |
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28 |
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$paste = $this->_model->getPaste(); |
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try { |
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28 |
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$paste->setData($data); |
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28 |
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if (!empty($attachment)) { |
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2 |
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$paste->setAttachment($attachment); |
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2 |
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if (!empty($attachmentname)) { |
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2 |
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$paste->setAttachmentName($attachmentname); |
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} |
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} |
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28 |
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$expire = $this->_request->getParam('expire'); |
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28 |
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if (!empty($expire)) { |
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6 |
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$paste->setExpiration($expire); |
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} |
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294
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28 |
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$burnafterreading = $this->_request->getParam('burnafterreading'); |
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28 |
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if (!empty($burnafterreading)) { |
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2 |
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$paste->setBurnafterreading($burnafterreading); |
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} |
298
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299
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26 |
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$opendiscussion = $this->_request->getParam('opendiscussion'); |
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26 |
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if (!empty($opendiscussion)) { |
301
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4 |
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$paste->setOpendiscussion($opendiscussion); |
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} |
303
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304
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24 |
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$formatter = $this->_request->getParam('formatter'); |
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24 |
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if (!empty($formatter)) { |
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2 |
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$paste->setFormatter($formatter); |
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} |
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309
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24 |
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$paste->store(); |
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6 |
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} catch (Exception $e) { |
311
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6 |
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return $this->_return_message(1, $e->getMessage()); |
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} |
313
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22 |
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$this->_return_message(0, $paste->getId(), array('deletetoken' => $paste->getDeleteToken())); |
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} |
315
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26 |
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} |
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317
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/** |
318
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* Delete an existing paste |
319
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* |
320
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* @access private |
321
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* @param string $dataid |
322
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* @param string $deletetoken |
323
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* @return void |
324
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*/ |
325
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18 |
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private function _delete($dataid, $deletetoken) |
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{ |
327
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try { |
328
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18 |
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$paste = $this->_model->getPaste($dataid); |
329
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16 |
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if ($paste->exists()) { |
330
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// accessing this property ensures that the paste would be |
331
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// deleted if it has already expired |
332
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14 |
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$burnafterreading = $paste->isBurnafterreading(); |
333
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if ( |
334
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12 |
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($burnafterreading && $deletetoken == 'burnafterreading') || |
335
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12 |
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Filter::slowEquals($deletetoken, $paste->getDeleteToken()) |
336
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) { |
337
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// Paste exists and deletion token is valid: Delete the paste. |
338
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8 |
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$paste->delete(); |
339
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8 |
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$this->_status = 'Paste was properly deleted.'; |
340
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} else { |
341
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4 |
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if (!$burnafterreading && $deletetoken == 'burnafterreading') { |
342
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2 |
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$this->_error = 'Paste is not of burn-after-reading type.'; |
343
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} else { |
344
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12 |
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$this->_error = 'Wrong deletion token. Paste was not deleted.'; |
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} |
346
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} |
347
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} else { |
348
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14 |
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$this->_error = self::GENERIC_ERROR; |
349
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} |
350
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4 |
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} catch (Exception $e) { |
351
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4 |
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$this->_error = $e->getMessage(); |
352
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} |
353
|
18 |
View Code Duplication |
if ($this->_request->isJsonApiCall()) { |
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354
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6 |
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if (strlen($this->_error)) { |
355
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2 |
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$this->_return_message(1, $this->_error); |
356
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} else { |
357
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4 |
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$this->_return_message(0, $dataid); |
358
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} |
359
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} |
360
|
18 |
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} |
361
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362
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/** |
363
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* Read an existing paste or comment |
364
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* |
365
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|
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* @access private |
366
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|
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* @param string $dataid |
367
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|
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* @return void |
368
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|
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*/ |
369
|
19 |
|
private function _read($dataid) |
370
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|
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{ |
371
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try { |
372
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19 |
|
$paste = $this->_model->getPaste($dataid); |
373
|
17 |
|
if ($paste->exists()) { |
374
|
13 |
|
$data = $paste->get(); |
375
|
11 |
|
$this->_doesExpire = property_exists($data, 'meta') && property_exists($data->meta, 'expire_date'); |
376
|
11 |
|
if (property_exists($data->meta, 'salt')) { |
377
|
11 |
|
unset($data->meta->salt); |
378
|
|
|
} |
379
|
11 |
|
$this->_data = json_encode($data); |
380
|
|
|
} else { |
381
|
15 |
|
$this->_error = self::GENERIC_ERROR; |
382
|
|
|
} |
383
|
4 |
|
} catch (Exception $e) { |
384
|
4 |
|
$this->_error = $e->getMessage(); |
385
|
|
|
} |
386
|
|
|
|
387
|
19 |
View Code Duplication |
if ($this->_request->isJsonApiCall()) { |
|
|
|
|
388
|
5 |
|
if (strlen($this->_error)) { |
389
|
2 |
|
$this->_return_message(1, $this->_error); |
390
|
|
|
} else { |
391
|
3 |
|
$this->_return_message(0, $dataid, json_decode($this->_data, true)); |
392
|
|
|
} |
393
|
|
|
} |
394
|
19 |
|
} |
395
|
|
|
|
396
|
|
|
/** |
397
|
|
|
* Display PrivateBin frontend. |
398
|
|
|
* |
399
|
|
|
* @access private |
400
|
|
|
* @return void |
401
|
|
|
*/ |
402
|
34 |
|
private function _view() |
403
|
|
|
{ |
404
|
|
|
// set headers to disable caching |
405
|
34 |
|
$time = gmdate('D, d M Y H:i:s \G\M\T'); |
406
|
34 |
|
header('Cache-Control: no-store, no-cache, no-transform, must-revalidate'); |
407
|
34 |
|
header('Pragma: no-cache'); |
408
|
34 |
|
header('Expires: ' . $time); |
409
|
34 |
|
header('Last-Modified: ' . $time); |
410
|
34 |
|
header('Vary: Accept'); |
411
|
34 |
|
header('Content-Security-Policy: ' . $this->_conf->getKey('cspheader')); |
412
|
34 |
|
header('X-Xss-Protection: 1; mode=block'); |
413
|
34 |
|
header('X-Frame-Options: DENY'); |
414
|
34 |
|
header('X-Content-Type-Options: nosniff'); |
415
|
|
|
|
416
|
|
|
// label all the expiration options |
417
|
34 |
|
$expire = array(); |
418
|
34 |
|
foreach ($this->_conf->getSection('expire_options') as $time => $seconds) { |
419
|
34 |
|
$expire[$time] = ($seconds == 0) ? I18n::_(ucfirst($time)) : Filter::formatHumanReadableTime($time); |
420
|
|
|
} |
421
|
|
|
|
422
|
|
|
// translate all the formatter options |
423
|
34 |
|
$formatters = array_map('PrivateBin\\I18n::_', $this->_conf->getSection('formatter_options')); |
424
|
|
|
|
425
|
|
|
// set language cookie if that functionality was enabled |
426
|
34 |
|
$languageselection = ''; |
427
|
34 |
|
if ($this->_conf->getKey('languageselection')) { |
428
|
2 |
|
$languageselection = I18n::getLanguage(); |
429
|
2 |
|
setcookie('lang', $languageselection); |
430
|
|
|
} |
431
|
|
|
|
432
|
34 |
|
$page = new View; |
433
|
34 |
|
$page->assign('NAME', $this->_conf->getKey('name')); |
434
|
34 |
|
$page->assign('CIPHERDATA', $this->_data); |
435
|
34 |
|
$page->assign('ERROR', I18n::_($this->_error)); |
436
|
34 |
|
$page->assign('STATUS', I18n::_($this->_status)); |
437
|
34 |
|
$page->assign('VERSION', self::VERSION); |
438
|
34 |
|
$page->assign('DISCUSSION', $this->_conf->getKey('discussion')); |
439
|
34 |
|
$page->assign('OPENDISCUSSION', $this->_conf->getKey('opendiscussion')); |
440
|
34 |
|
$page->assign('MARKDOWN', array_key_exists('markdown', $formatters)); |
441
|
34 |
|
$page->assign('SYNTAXHIGHLIGHTING', array_key_exists('syntaxhighlighting', $formatters)); |
442
|
34 |
|
$page->assign('SYNTAXHIGHLIGHTINGTHEME', $this->_conf->getKey('syntaxhighlightingtheme')); |
443
|
34 |
|
$page->assign('FORMATTER', $formatters); |
444
|
34 |
|
$page->assign('FORMATTERDEFAULT', $this->_conf->getKey('defaultformatter')); |
445
|
34 |
|
$page->assign('NOTICE', I18n::_($this->_conf->getKey('notice'))); |
446
|
34 |
|
$page->assign('BURNAFTERREADINGSELECTED', $this->_conf->getKey('burnafterreadingselected')); |
447
|
34 |
|
$page->assign('PASSWORD', $this->_conf->getKey('password')); |
448
|
34 |
|
$page->assign('FILEUPLOAD', $this->_conf->getKey('fileupload')); |
449
|
34 |
|
$page->assign('ZEROBINCOMPATIBILITY', $this->_conf->getKey('zerobincompatibility')); |
450
|
34 |
|
$page->assign('LANGUAGESELECTION', $languageselection); |
451
|
34 |
|
$page->assign('LANGUAGES', I18n::getLanguageLabels(I18n::getAvailableLanguages())); |
452
|
34 |
|
$page->assign('EXPIRE', $expire); |
453
|
34 |
|
$page->assign('EXPIREDEFAULT', $this->_conf->getKey('default', 'expire')); |
454
|
34 |
|
$page->assign('EXPIRECLONE', !$this->_doesExpire || ($this->_doesExpire && $this->_conf->getKey('clone', 'expire'))); |
455
|
34 |
|
$page->assign('URLSHORTENER', $this->_conf->getKey('urlshortener')); |
456
|
34 |
|
$page->draw($this->_conf->getKey('template')); |
457
|
34 |
|
} |
458
|
|
|
|
459
|
|
|
/** |
460
|
|
|
* outputs requested JSON-LD context |
461
|
|
|
* |
462
|
|
|
* @access private |
463
|
|
|
* @param string $type |
464
|
|
|
* @return void |
465
|
|
|
*/ |
466
|
5 |
|
private function _jsonld($type) |
467
|
|
|
{ |
468
|
|
|
if ( |
469
|
5 |
|
$type !== 'paste' && $type !== 'comment' && |
470
|
5 |
|
$type !== 'pastemeta' && $type !== 'commentmeta' |
471
|
|
|
) { |
472
|
1 |
|
$type = ''; |
473
|
|
|
} |
474
|
5 |
|
$content = '{}'; |
475
|
5 |
|
$file = PUBLIC_PATH . DIRECTORY_SEPARATOR . 'js' . DIRECTORY_SEPARATOR . $type . '.jsonld'; |
476
|
5 |
|
if (is_readable($file)) { |
477
|
4 |
|
$content = str_replace( |
478
|
4 |
|
'?jsonld=', |
479
|
4 |
|
$this->_urlBase . '?jsonld=', |
480
|
|
|
file_get_contents($file) |
481
|
|
|
); |
482
|
|
|
} |
483
|
|
|
|
484
|
5 |
|
header('Content-type: application/ld+json'); |
485
|
5 |
|
header('Access-Control-Allow-Origin: *'); |
486
|
5 |
|
header('Access-Control-Allow-Methods: GET'); |
487
|
5 |
|
echo $content; |
488
|
5 |
|
} |
489
|
|
|
|
490
|
|
|
/** |
491
|
|
|
* prepares JSON encoded status message |
492
|
|
|
* |
493
|
|
|
* @access private |
494
|
|
|
* @param int $status |
495
|
|
|
* @param string $message |
496
|
|
|
* @param array $other |
497
|
|
|
* @return void |
498
|
|
|
*/ |
499
|
55 |
|
private function _return_message($status, $message, $other = array()) |
500
|
|
|
{ |
501
|
55 |
|
$result = array('status' => $status); |
502
|
55 |
|
if ($status) { |
503
|
26 |
|
$result['message'] = I18n::_($message); |
504
|
|
|
} else { |
505
|
31 |
|
$result['id'] = $message; |
506
|
31 |
|
$result['url'] = $this->_urlBase . '?' . $message; |
507
|
|
|
} |
508
|
55 |
|
$result += $other; |
509
|
55 |
|
$this->_json = json_encode($result); |
510
|
55 |
|
} |
511
|
|
|
} |
512
|
|
|
|
Adding a
@return
annotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.