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< ? php
/**
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* PrivateBin
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*
* a zero - knowledge paste bin
*
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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 ;
use PrivateBin\Persistence\TrafficLimiter ;
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/**
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* PrivateBin
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*
* Controller , puts it all together .
*/
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class PrivateBin
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{
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/**
* version
*
* @ const string
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*/
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const VERSION = '1.1' ;
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/**
* minimal required PHP version
*
* @ const string
*/
const MIN_PHP_VERSION = '5.4.0' ;
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/**
* show the same error message if the paste expired or does not exist
*
* @ const string
*/
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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* @ access private
* @ var string
*/
private $_data = '' ;
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/**
* does the paste expire
*
* @ access private
* @ var bool
*/
private $_doesExpire = false ;
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/**
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* error message
*
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* @ access private
* @ var string
*/
private $_error = '' ;
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/**
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* status message
*
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* @ access private
* @ var string
*/
private $_status = '' ;
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/**
* JSON message
*
* @ access private
* @ var string
*/
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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*/
private $_model ;
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/**
* request
*
* @ access private
* @ var request
*/
private $_request ;
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/**
* URL base
*
* @ access private
* @ var string
*/
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private $_urlBase ;
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/**
* constructor
*
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* initializes and runs PrivateBin
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*
* @ access public
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* @ throws Exception
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*/
public function __construct ()
{
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if ( version_compare ( PHP_VERSION , self :: MIN_PHP_VERSION ) < 0 ) {
throw new Exception ( I18n :: _ ( '%s requires php %s or above to work. Sorry.' , I18n :: _ ( 'PrivateBin' ), self :: MIN_PHP_VERSION ), 1 );
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}
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if ( strlen ( PATH ) < 0 && substr ( PATH , - 1 ) !== DIRECTORY_SEPARATOR ) {
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throw new Exception ( I18n :: _ ( '%s requires the PATH to end in a "%s". Please update the PATH in your index.php.' , I18n :: _ ( 'PrivateBin' ), DIRECTORY_SEPARATOR ), 5 );
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}
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// load config from ini file, initialize required classes
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$this -> _init ();
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switch ( $this -> _request -> getOperation ()) {
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case 'create' :
$this -> _create ();
break ;
case 'delete' :
$this -> _delete (
$this -> _request -> getParam ( 'pasteid' ),
$this -> _request -> getParam ( 'deletetoken' )
);
break ;
case 'read' :
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// reading paste is disallowed in HTML display
if ( $this -> _request -> isJsonApiCall ()) {
$this -> _read ( $this -> _request -> getParam ( 'pasteid' ));
}
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break ;
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case 'jsonld' :
$this -> _jsonld ( $this -> _request -> getParam ( 'jsonld' ));
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: *' );
header ( 'Access-Control-Allow-Methods: GET, POST, PUT, DELETE' );
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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* initialize privatebin
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*
* @ access private
*/
private function _init ()
{
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$this -> _conf = new Configuration ;
$this -> _model = new Model ( $this -> _conf );
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$this -> _request = new Request ;
$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
$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 ;
setcookie ( 'lang' , $lang );
}
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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 :
* data = json encoded SJCL encrypted text ( containing keys : iv , v , iter , ks , ts , mode , adata , cipher , salt , ct )
* attachment = json encoded SJCL encrypted text ( containing keys : iv , v , iter , ks , ts , mode , adata , cipher , salt , ct )
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*
* All optional data will go to meta information :
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* expire ( optional ) = expiration delay ( never , 5 min , 10 min , 1 hour , 1 day , 1 week , 1 month , 1 year , burn ) ( default : never )
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* formatter ( optional ) = format to display the paste as ( plaintext , syntaxhighlighting , markdown ) ( default : syntaxhighlighting )
* 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 .
* pasteid ( optional ) = in discussion , which paste this comment belongs to .
*
* @ 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 );
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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$data = $this -> _request -> getParam ( 'data' );
$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 (
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 :: formatHumanReadableSize ( $sizelimit )
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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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if ( strlen ( $attachmentname ) > 0 && strlen ( $attachment ) == 0 ) {
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return $this -> _return_message ( 1 , 'Attachment missing in data received by server. Please check your webserver or suhosin configuration for maximum POST parameter limitations.' );
}
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// The user posts a comment.
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$pasteid = $this -> _request -> getParam ( 'pasteid' );
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$parentid = $this -> _request -> getParam ( 'parentid' );
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if ( ! empty ( $pasteid ) && ! empty ( $parentid )) {
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$paste = $this -> _model -> getPaste ( $pasteid );
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if ( $paste -> exists ()) {
try {
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$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 );
$comment -> store ();
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} catch ( Exception $e ) {
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return $this -> _return_message ( 1 , $e -> getMessage ());
}
$this -> _return_message ( 0 , $comment -> getId ());
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} else {
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$this -> _return_message ( 1 , 'Invalid data.' );
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}
}
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// The user posts a standard paste.
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else {
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$this -> _model -> purge ();
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$paste = $this -> _model -> getPaste ();
try {
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$paste -> setData ( $data );
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if ( ! empty ( $attachment )) {
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$paste -> setAttachment ( $attachment );
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if ( ! empty ( $attachmentname )) {
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$paste -> setAttachmentName ( $attachmentname );
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}
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}
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$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 -> store ();
} catch ( Exception $e ) {
return $this -> _return_message ( 1 , $e -> getMessage ());
}
$this -> _return_message ( 0 , $paste -> getId (), array ( 'deletetoken' => $paste -> getDeleteToken ()));
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}
}
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/**
* Delete an existing paste
*
* @ access private
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* @ param string $dataid
* @ param string $deletetoken
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*/
private function _delete ( $dataid , $deletetoken )
{
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try {
$paste = $this -> _model -> getPaste ( $dataid );
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if ( $paste -> exists ()) {
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// accessing this property ensures that the paste would be
// deleted if it has already expired
$burnafterreading = $paste -> isBurnafterreading ();
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if (
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( $burnafterreading && $deletetoken == 'burnafterreading' ) || // either we burn-after it has been read //@TODO: not needed anymore now?
Filter :: slowEquals ( $deletetoken , $paste -> getDeleteToken ()) // or we manually delete it with this secret token
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) {
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// Paste exists and deletion token (if required) is valid: Delete the paste.
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$paste -> delete ();
$this -> _status = 'Paste was properly deleted.' ;
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} else {
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if ( ! $burnafterreading && $deletetoken == 'burnafterreading' ) {
$this -> _error = 'Paste is not of burn-after-reading type.' ;
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} else {
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$this -> _error = 'Wrong deletion token. Paste was not deleted.' ;
}
}
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} else {
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$this -> _error = self :: GENERIC_ERROR ;
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}
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} catch ( Exception $e ) {
$this -> _error = $e -> getMessage ();
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}
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if ( $this -> _request -> isJsonApiCall ()) {
if ( strlen ( $this -> _error )) {
$this -> _return_message ( 1 , $this -> _error );
} else {
$this -> _return_message ( 0 , $dataid );
}
}
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}
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/**
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* Read an existing paste or comment
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*
* @ access private
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* @ param string $dataid
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*/
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private function _read ( $dataid )
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{
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try {
$paste = $this -> _model -> getPaste ( $dataid );
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if ( $paste -> exists ()) {
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$data = $paste -> get ();
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$this -> _doesExpire = property_exists ( $data , 'meta' ) && property_exists ( $data -> meta , 'expire_date' );
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if ( property_exists ( $data -> meta , 'salt' )) {
unset ( $data -> meta -> salt );
}
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$this -> _data = json_encode ( $data );
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// If the paste was meant to be read only once, delete it.
if ( $paste -> isBurnafterreading ()) {
$paste -> delete ();
}
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} else {
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$this -> _error = self :: GENERIC_ERROR ;
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}
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} catch ( Exception $e ) {
$this -> _error = $e -> getMessage ();
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}
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if ( $this -> _request -> isJsonApiCall ()) {
if ( strlen ( $this -> _error )) {
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$this -> _return_message ( 1 , $this -> _error );
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} else {
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$this -> _return_message ( 0 , $dataid , json_decode ( $this -> _data , true ));
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}
}
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}
/**
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* Display PrivateBin frontend .
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*
* @ access private
*/
private function _view ()
{
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// set headers to disable caching
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$time = gmdate ( 'D, d M Y H:i:s \G\M\T' );
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header ( 'Cache-Control: no-store, no-cache, no-transform, must-revalidate' );
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header ( 'Pragma: no-cache' );
header ( 'Expires: ' . $time );
header ( 'Last-Modified: ' . $time );
header ( 'Vary: Accept' );
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header ( 'Content-Security-Policy: ' . $this -> _conf -> getKey ( 'cspheader' ));
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header ( 'X-Xss-Protection: 1; mode=block' );
header ( 'X-Frame-Options: DENY' );
header ( 'X-Content-Type-Options: nosniff' );
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// label all the expiration options
$expire = array ();
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foreach ( $this -> _conf -> getSection ( 'expire_options' ) as $time => $seconds ) {
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$expire [ $time ] = ( $seconds == 0 ) ? I18n :: _ ( ucfirst ( $time )) : Filter :: formatHumanReadableTime ( $time );
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}
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// translate all the formatter options
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$formatters = array_map ( 'PrivateBin\\I18n::_' , $this -> _conf -> getSection ( 'formatter_options' ));
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// set language cookie if that functionality was enabled
$languageselection = '' ;
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if ( $this -> _conf -> getKey ( 'languageselection' )) {
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$languageselection = I18n :: getLanguage ();
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setcookie ( 'lang' , $languageselection );
}
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$page = new View ;
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$page -> assign ( 'NAME' , $this -> _conf -> getKey ( 'name' ));
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$page -> assign ( 'CIPHERDATA' , $this -> _data );
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$page -> assign ( 'ERROR' , I18n :: _ ( $this -> _error ));
$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' ));
$page -> assign ( 'OPENDISCUSSION' , $this -> _conf -> getKey ( 'opendiscussion' ));
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$page -> assign ( 'MARKDOWN' , array_key_exists ( 'markdown' , $formatters ));
$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' ));
$page -> assign ( 'PASSWORD' , $this -> _conf -> getKey ( 'password' ));
$page -> assign ( 'FILEUPLOAD' , $this -> _conf -> getKey ( 'fileupload' ));
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$page -> assign ( 'ZEROBINCOMPATIBILITY' , $this -> _conf -> getKey ( 'zerobincompatibility' ));
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$page -> assign ( 'LANGUAGESELECTION' , $languageselection );
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$page -> assign ( 'LANGUAGES' , I18n :: getLanguageLabels ( I18n :: getAvailableLanguages ()));
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$page -> assign ( 'EXPIRE' , $expire );
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$page -> assign ( 'EXPIREDEFAULT' , $this -> _conf -> getKey ( 'default' , 'expire' ));
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$page -> assign ( 'EXPIRECLONE' , ! $this -> _doesExpire || ( $this -> _doesExpire && $this -> _conf -> getKey ( 'clone' , 'expire' )));
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$page -> assign ( 'URLSHORTENER' , $this -> _conf -> getKey ( 'urlshortener' ));
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$page -> draw ( $this -> _conf -> getKey ( 'template' ));
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}
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/**
* outputs requested JSON - LD context
*
* @ access private
* @ param string $type
*/
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private function _jsonld ( $type )
{
if (
$type !== 'paste' && $type !== 'comment' &&
$type !== 'pastemeta' && $type !== 'commentmeta'
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) {
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$type = '' ;
}
$content = '{}' ;
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$file = PUBLIC_PATH . DIRECTORY_SEPARATOR . 'js' . DIRECTORY_SEPARATOR . $type . '.jsonld' ;
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if ( is_readable ( $file )) {
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$content = str_replace (
'?jsonld=' ,
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$this -> _urlBase . '?jsonld=' ,
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file_get_contents ( $file )
);
}
header ( 'Content-type: application/ld+json' );
header ( 'Access-Control-Allow-Origin: *' );
header ( 'Access-Control-Allow-Methods: GET' );
echo $content ;
}
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/**
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* prepares JSON encoded status message
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*
* @ access private
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* @ param int $status
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* @ param string $message
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* @ param array $other
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*/
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private function _return_message ( $status , $message , $other = array ())
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{
$result = array ( 'status' => $status );
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if ( $status ) {
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$result [ 'message' ] = I18n :: _ ( $message );
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} else {
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$result [ 'id' ] = $message ;
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$result [ 'url' ] = $this -> _urlBase . '?' . $message ;
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}
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$result += $other ;
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$this -> _json = json_encode ( $result );
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}
}