includes/AjaxFunctions.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup Ajax
   5  */
   6
   7 if( !defined( 'MEDIAWIKI' ) ) {
   8         die( 1 );
   9 }
  10
  11 /**
  12  * Function converts an Javascript escaped string back into a string with
  13  * specified charset (default is UTF-8).
  14  * Modified function from http://pure-essence.net/stuff/code/utf8RawUrlDecode.phps
  15  *
  16  * @param $source String escaped with Javascript's escape() function
  17  * @param $iconv_to String destination character set will be used as second paramether in the iconv function. Default is UTF-8.
  18  * @return string
  19  */
  20 function js_unescape($source, $iconv_to = 'UTF-8') {
  21         $decodedStr = '';
  22         $pos = 0;
  23         $len = strlen ($source);
  24
  25         while ($pos < $len) {
  26                 $charAt = substr ($source, $pos, 1);
  27                 if ($charAt == '%') {
  28                         $pos++;
  29                         $charAt = substr ($source, $pos, 1);
  30                         if ($charAt == 'u') {
  31                                 // we got a unicode character
  32                                 $pos++;
  33                                 $unicodeHexVal = substr ($source, $pos, 4);
  34                                 $unicode = hexdec ($unicodeHexVal);
  35                                 $decodedStr .= code2utf($unicode);
  36                                 $pos += 4;
  37                         } else {
  38                                 // we have an escaped ascii character
  39                                 $hexVal = substr ($source, $pos, 2);
  40                                 $decodedStr .= chr (hexdec ($hexVal));
  41                                 $pos += 2;
  42                         }
  43                 } else {
  44                         $decodedStr .= $charAt;
  45                         $pos++;
  46                 }
  47         }
  48
  49         if ($iconv_to != "UTF-8") {
  50                 $decodedStr = iconv("UTF-8", $iconv_to, $decodedStr);
  51         }
  52
  53         return $decodedStr;
  54 }
  55
  56 /**
  57  * Function coverts number of utf char into that character.
  58  * Function taken from: http://www.php.net/manual/en/function.utf8-encode.php#49336
  59  *
  60  * @param $num Integer
  61  * @return utf8char
  62  */
  63 function code2utf($num){
  64    if ( $num<128 )
  65         return chr($num);
  66    if ( $num<2048 )
  67         return chr(($num>>6)+192).chr(($num&63)+128);
  68    if ( $num<65536 )
  69         return chr(($num>>12)+224).chr((($num>>6)&63)+128).chr(($num&63)+128);
  70    if ( $num<2097152 )
  71         return chr(($num>>18)+240).chr((($num>>12)&63)+128).chr((($num>>6)&63)+128) .chr(($num&63)+128);
  72    return '';
  73 }
  74
  75 /**
  76  * Called for AJAX watch/unwatch requests.
  77  * @param $pagename Prefixed title string for page to watch/unwatch
  78  * @param $watch String 'w' to watch, 'u' to unwatch
  79  * @return String '<w#>' or '<u#>' on successful watch or unwatch,
  80  *   respectively, followed by an HTML message to display in the alert box; or
  81  *   '<err#>' on error
  82  */
  83 function wfAjaxWatch($pagename = "", $watch = "") {
  84         if(wfReadOnly()) {
  85                 // redirect to action=(un)watch, which will display the database lock
  86                 // message
  87                 return '<err#>';
  88         }
  89
  90         if('w' !== $watch && 'u' !== $watch) {
  91                 return '<err#>';
  92         }
  93         $watch = 'w' === $watch;
  94
  95         $title = Title::newFromDBkey($pagename);
  96         if(!$title) {
  97                 // Invalid title
  98                 return '<err#>';
  99         }
 100         $article = new Article($title);
 101         $watching = $title->userIsWatching();
 102
 103         if($watch) {
 104                 if(!$watching) {
 105                         $dbw = wfGetDB(DB_MASTER);
 106                         $dbw->begin();
 107                         $ok = $article->doWatch();
 108                         $dbw->commit();
 109                 }
 110         } else {
 111                 if($watching) {
 112                         $dbw = wfGetDB(DB_MASTER);
 113                         $dbw->begin();
 114                         $ok = $article->doUnwatch();
 115                         $dbw->commit();
 116                 }
 117         }
 118         // Something stopped the change
 119         if( isset($ok) && !$ok ) {
 120                 return '<err#>';
 121         }
 122         if( $watch ) {
 123                 return '<w#>'.wfMsgExt( 'addedwatchtext', array( 'parse' ), $title->getPrefixedText() );
 124         } else {
 125                 return '<u#>'.wfMsgExt( 'removedwatchtext', array( 'parse' ), $title->getPrefixedText() );
 126         }
 127 }