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         var $vary;
  76
  77         function AjaxCachePolicy( $policy = null, $vary = null ) {
  78                 $this->policy = $policy;
  79                 $this->vary = $vary;
  80         }
  81
  82         function setPolicy( $policy ) {
  83                 $this->policy = $policy;
  84         }
  85
  86         function setVary( $vary ) {
  87                 $this->vary = $vary;
  88         }
  89
  90         function writeHeader() {
  91                 global $wgUseSquid, $wgUseESI, $wgSquidMaxage;
  92
  93                 header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  94
  95                 if ( $this->policy ) {
  96
  97                         # If squid caches are configured, tell them to cache the response,
  98                         # and tell the client to always check with the squid. Otherwise,
  99                         # tell the client to use a cached copy, without a way to purge it.
 100
 101                         if( $wgUseSquid ) {
 102
 103                                 # Expect explicite purge of the proxy cache, but require end user agents
 104                                 # to revalidate against the proxy on each visit.
 105                                 # Surrogate-Control controls our Squid, Cache-Control downstream caches
 106
 107                                 if ( $wgUseESI ) {
 108                                         header( 'Surrogate-Control: max-age='.$this->policy.', content="ESI/1.0"');
 109                                         header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
 110                                 } else {
 111                                         header( 'Cache-Control: s-maxage='.$this->policy.', must-revalidate, max-age=0' );
 112                                 }
 113
 114                         } else {
 115
 116                                 # Let the client do the caching. Cache is not purged.
 117                                 header ("Expires: " . gmdate( "D, d M Y H:i:s", time() + $this->policy ) . " GMT");
 118                                 header ("Cache-Control: s-max-age={$this->policy},public,max-age={$this->policy}");
 119                         }
 120
 121                 } else {
 122                         # always expired, always modified
 123                         header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
 124                         header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1
 125                         header ("Pragma: no-cache");                          // HTTP/1.0
 126                 }
 127
 128                 if ( $this->vary ) {
 129                         header ( "Vary: " . $this->vary );
 130                 }
 131         }
 132 }
 133
 134
 135 function wfSajaxSearch( $term ) {
 136         global $wgContLang, $wgAjaxCachePolicy, $wgOut;
 137         $limit = 16;
 138
 139         $l = new Linker;
 140
 141         $term = str_replace( ' ', '_', $wgContLang->ucfirst(
 142                         $wgContLang->checkTitleEncoding( $wgContLang->recodeInput( js_unescape( $term ) ) )
 143                 ) );
 144
 145         if ( strlen( str_replace( '_', '', $term ) )<3 )
 146                 return;
 147
 148         $wgAjaxCachePolicy->setPolicy( 30*60 );
 149
 150         $db =& wfGetDB( DB_SLAVE );
 151         $res = $db->select( 'page', 'page_title',
 152                         array(  'page_namespace' => 0,
 153                                 "page_title LIKE '". $db->strencode( $term) ."%'" ),
 154                                 "wfSajaxSearch",
 155                                 array( 'LIMIT' => $limit+1 )
 156                         );
 157
 158         $r = "";
 159
 160         $i=0;
 161         while ( ( $row = $db->fetchObject( $res ) ) && ( ++$i <= $limit ) ) {
 162                 $nt = Title::newFromDBkey( $row->page_title );
 163                 $r .= '<li>' . $l->makeKnownLinkObj( $nt ) . "</li>\n";
 164         }
 165         if ( $i > $limit ) {
 166                 $more = '<i>' .  $l->makeKnownLink( $wgContLang->specialPage( "Allpages" ),
 167                                                 wfMsg('moredotdotdot'),
 168                                                 "namespace=0&from=" . wfUrlEncode ( $term ) ) .
 169                         '</i>';
 170         } else {
 171                 $more = '';
 172         }
 173
 174         $subtitlemsg = ( Title::newFromText($term) ? 'searchsubtitle' : 'searchsubtitleinvalid' );
 175         $subtitle = $wgOut->parse( wfMsg( $subtitlemsg, wfEscapeWikiText($term) ) );
 176
 177         $term = htmlspecialchars( $term );
 178         return '<div style="float:right; border:solid 1px black;background:gainsboro;padding:2px;"><a onclick="Searching_Hide_Results();">'
 179                 . wfMsg( 'hideresults' ) . '</a></div>'
 180                 . '<h1 class="firstHeading">'.wfMsg('search')
 181                 . '</h1><div id="contentSub">'. $subtitle . '</div><ul><li>'
 182                 . $l->makeKnownLink( $wgContLang->specialPage( 'Search' ),
 183                                         wfMsg( 'searchcontaining', $term ),
 184                                         "search=$term&fulltext=Search" )
 185                 . '</li><li>' . $l->makeKnownLink( $wgContLang->specialPage( 'Search' ),
 186                                         wfMsg( 'searchnamed', $term ) ,
 187                                         "search=$term&go=Go" )
 188                 . "</li></ul><h2>" . wfMsg( 'articletitles', $term ) . "</h2>"
 189                 . '<ul>' .$r .'</ul>'.$more;
 190 }
 191
 192 ?>