includes/AjaxFunctions.php

   1 <?php
   2
   3 if( !defined( 'MEDIAWIKI' ) )
   4         die( 1 );
   5
   6 require_once('WebRequest.php');
   7
   8 /**
   9  * Function converts an Javascript escaped string back into a string with
  10  * specified charset (default is UTF-8).
  11  * Modified function from http://pure-essence.net/stuff/code/utf8RawUrlDecode.phps
  12  *
  13  * @param $source String escaped with Javascript's escape() function
  14  * @param $iconv_to String destination character set will be used as second paramether in the iconv function. Default is UTF-8.
  15  * @return string
  16  */
  17 function js_unescape($source, $iconv_to = 'UTF-8') {
  18    $decodedStr = '';
  19    $pos = 0;
  20    $len = strlen ($source);
  21    while ($pos < $len) {
  22        $charAt = substr ($source, $pos, 1);
  23        if ($charAt == '%') {
  24            $pos++;
  25            $charAt = substr ($source, $pos, 1);
  26            if ($charAt == 'u') {
  27                // we got a unicode character
  28                $pos++;
  29                $unicodeHexVal = substr ($source, $pos, 4);
  30                $unicode = hexdec ($unicodeHexVal);
  31                $decodedStr .= code2utf($unicode);
  32                $pos += 4;
  33            }
  34            else {
  35                // we have an escaped ascii character
  36                $hexVal = substr ($source, $pos, 2);
  37                $decodedStr .= chr (hexdec ($hexVal));
  38                $pos += 2;
  39            }
  40        }
  41        else {
  42            $decodedStr .= $charAt;
  43            $pos++;
  44        }
  45    }
  46
  47    if ($iconv_to != "UTF-8") {
  48        $decodedStr = iconv("UTF-8", $iconv_to, $decodedStr);
  49    }
  50
  51    return $decodedStr;
  52 }
  53
  54 /**
  55  * Function coverts number of utf char into that character.
  56  * Function taken from: http://sk2.php.net/manual/en/function.utf8-encode.php#49336
  57  *
  58  * @param $num Integer
  59  * @return utf8char
  60  */
  61 function code2utf($num){
  62    if ( $num<128 )
  63         return chr($num);
  64    if ( $num<2048 )
  65         return chr(($num>>6)+192).chr(($num&63)+128);
  66    if ( $num<65536 )
  67         return chr(($num>>12)+224).chr((($num>>6)&63)+128).chr(($num&63)+128);
  68    if ( $num<2097152 )
  69         return chr(($num>>18)+240).chr((($num>>12)&63)+128).chr((($num>>6)&63)+128) .chr(($num&63)+128);
  70    return '';
  71 }
  72
  73 class AjaxCachePolicy {
  74         var $policy;
  75
  76         function AjaxCachePolicy( $policy = null ) {
  77                 $this->policy = $policy;
  78         }
  79
  80         function setPolicy( $policy ) {
  81                 $this->policy = $policy;
  82         }
  83
  84         function writeHeader() {
  85                 header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  86                 if ( is_null( $this->policy ) ) {
  87                         // Bust cache in the head
  88                         header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
  89                         // always modified
  90                         header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1
  91                         header ("Pragma: no-cache");                          // HTTP/1.0
  92                 } else {
  93                         header ("Expires: " . gmdate( "D, d M Y H:i:s", time() + $this->policy ) . " GMT");
  94                         header ("Cache-Control: s-max-age={$this->policy},public,max-age={$this->policy}");
  95                 }
  96         }
  97 }
  98
  99
 100 function wfSajaxSearch( $term ) {
 101         global $wgContLang, $wgAjaxCachePolicy, $wgOut;
 102         $limit = 16;
 103
 104         $l = new Linker;
 105
 106         $term = str_replace( ' ', '_', $wgContLang->ucfirst(
 107                         $wgContLang->checkTitleEncoding( $wgContLang->recodeInput( js_unescape( $term ) ) )
 108                 ) );
 109
 110         if ( strlen( str_replace( '_', '', $term ) )<3 )
 111                 return;
 112
 113         $wgAjaxCachePolicy->setPolicy( 30*60 );
 114
 115         $db =& wfGetDB( DB_SLAVE );
 116         $res = $db->select( 'page', 'page_title',
 117                         array(  'page_namespace' => 0,
 118                                 "page_title LIKE '". $db->strencode( $term) ."%'" ),
 119                                 "wfSajaxSearch",
 120                                 array( 'LIMIT' => $limit+1 )
 121                         );
 122
 123         $r = "";
 124
 125         $i=0;
 126         while ( ( $row = $db->fetchObject( $res ) ) && ( ++$i <= $limit ) ) {
 127                 $nt = Title::newFromDBkey( $row->page_title );
 128                 $r .= '<li>' . $l->makeKnownLinkObj( $nt ) . "</li>\n";
 129         }
 130         if ( $i > $limit ) {
 131                 $more = '<i>' .  $l->makeKnownLink( $wgContLang->specialPage( "Allpages" ),
 132                                                 wfMsg('moredotdotdot'),
 133                                                 "namespace=0&from=" . wfUrlEncode ( $term ) ) .
 134                         '</i>';
 135         } else {
 136                 $more = '';
 137         }
 138
 139         $subtitlemsg = ( Title::newFromText($term) ? 'searchsubtitle' : 'searchsubtitleinvalid' );
 140         $subtitle = $wgOut->parse( wfMsg( $subtitlemsg, wfEscapeWikiText($term) ) );
 141
 142         $term = htmlspecialchars( $term );
 143         return '<div style="float:right; border:solid 1px black;background:gainsboro;padding:2px;"><a onclick="Searching_Hide_Results();">'
 144                 . wfMsg( 'hideresults' ) . '</a></div>'
 145                 . '<h1 class="firstHeading">'.wfMsg('search')
 146                 . '</h1><div id="contentSub">'. $subtitle . '</div><ul><li>'
 147                 . $l->makeKnownLink( $wgContLang->specialPage( 'Search' ),
 148                                         wfMsg( 'searchcontaining', $term ),
 149                                         "search=$term&fulltext=Search" )
 150                 . '</li><li>' . $l->makeKnownLink( $wgContLang->specialPage( 'Search' ),
 151                                         wfMsg( 'searchnamed', $term ) ,
 152                                         "search=$term&go=Go" )
 153                 . "</li></ul><h2>" . wfMsg( 'articletitles', $term ) . "</h2>"
 154                 . '<ul>' .$r .'</ul>'.$more;
 155 }
 156
 157 ?>