<?php // $Id: filter.php,v 1.38.2.19 2011/03/09 08:17:04 moodlerobot Exp $
//////////////////////////////////////////////////////////////
//  Media plugin filtering
//
//  This filter will replace any links to a media file with
//  a media plugin that plays that media inline
//
//  To activate this filter, add a line like this to your
//  list of filters in your Filter configuration:
//
//  filter/mediaplugin/filter.php
//
//////////////////////////////////////////////////////////////

/// This is the filtering function itself.  It accepts the
/// courseid and the text to be filtered (in HTML form).

require_once($CFG->libdir.'/filelib.php');


function mediaplugin_filter($courseid, $text) {
    global $CFG;
    static $eolas_fix_applied = false;

    // You should never modify parameters passed to a method or function, it's BAD practice. Create a copy instead.
    // The reason is that you must always be able to refer to the original parameter that was passed.
    // For this reason, I changed $text = preg_replace(..,..,$text) into $newtext = preg.... (NICOLAS CONNAULT)
    // Thanks to Pablo Etcheverry for pointing this out! MDL-10177

    // We're using the UFO technique for flash to attain XHTML Strict 1.0
    // See: http://www.bobbyvandersluis.com/ufo/
    if (!is_string($text)) {
        // non string data can not be filtered anyway
        return $text;
    }
    $newtext = $text; // fullclone is slow and not needed here

    if ($CFG->filter_mediaplugin_enable_mp3) {
        $search = '/<a\s[^>]*href="([^"]+\.mp3)"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_mp3_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_ogg) {
        $search =   '/<a\s[^>]*href="([^"]+\.ogg)"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'filter_mediaplugin_ogg_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_ogv) {
        $search =   '/<a\s[^>]*href="([^"]+\.ogv)"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'filter_mediaplugin_ogv_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_swf) {
        $search = '/<a\s[^>]*href="([^"]+\.swf)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_swf_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_flv) {
        $search = '/<a\s[^>]*href="([^"]+\.flv)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_flv_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_mov) {
        $search = '/<a\s[^>]*href="([^"]+\.mov)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_qt_callback', $newtext);

        // MDL-18658
        $search = '/<a\s[^>]*href="([^"]+\.mp4)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_qt_callback', $newtext);

        $search = '/<a\s[^>]*href="([^"]+\.m4v)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_qt_callback', $newtext);

        $search = '/<a\s[^>]*href="([^<]+\.m4a)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_qt_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_wmv) {
        $search = '/<a\s[^>]*href="([^"]+\.wmv)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_wmp_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_mpg) {
        $search = '/<a\s[^>]*href="([^"]+\.mpe?g)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_qt_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_avi) {
        $search = '/<a\s[^>]*href="([^"]+\.avi)(\?d=([\d]{1,4}%?)x([\d]{1,4}%?))?"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_wmp_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_ram) {
        $search = '/<a\s[^>]*href="([^"]+\.ram)"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_real_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_rpm) {
        $search = '/<a\s[^>]*href="([^"]+\.rpm)"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_real_callback', $newtext);
    }

    if ($CFG->filter_mediaplugin_enable_rm) {
        $search = '/<a\s[^>]*href="([^"]+\.rm)"[^>]*>.*?<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_real_callback', $newtext);
    }

    if (!empty($CFG->filter_mediaplugin_enable_youtube)) {
        $search = '/<a\s[^>]*href="([^"]*)youtube.com\/watch\?v=([^"]*)"[^>]*>(.*?)<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_youtube_callback', $newtext);

        $search = '/<a\s[^>]*href="([^"]*)youtube.com\/v\/([^"]*)"[^>]*>(.*?)<\/a>/is';
        $newtext = preg_replace_callback($search, 'mediaplugin_filter_youtube_callback', $newtext);
    }

    if (is_null($newtext) or $newtext === $text) {
        // error or not filtered
        return $text;
    }

    if (!$eolas_fix_applied) {
        $newtext .= '<script defer="defer" src="' . $CFG->wwwroot . '/filter/mediaplugin/eolas_fix.js" type="text/javascript">// <![CDATA[ ]]></script>';
        $eolas_fix_applied = true;
    }

    return $newtext;
}

///===========================
/// callback filter functions

function mediaplugin_filter_mp3_callback($link) {
    global $CFG, $THEME;

    if (!empty($THEME->filter_mediaplugin_colors)) {
        $c = $THEME->filter_mediaplugin_colors;   // You can set this up in your theme/xxx/config.php
    } else {
        $c = 'bgColour=000000&btnColour=ffffff&btnBorderColour=cccccc&iconColour=000000&'.
             'iconOverColour=00cc00&trackColour=cccccc&handleColour=ffffff&loaderColour=ffffff&'.
             'waitForPlay=yes';
    }

    static $count = 0;
    $count++;
    $id = 'filter_mp3_'.time().$count; //we need something unique because it might be stored in text cache
    $url = $link[1];
    $jsurl = addslashes_js($link[1]);

    $printlink = '<a href="'.$url.'">'.get_string('mp3audio', 'mediaplugin').'</a>';
    return $printlink.
'<span class="mediaplugin mediaplugin_mp3" id="'.$id.'">('.get_string('mp3audio', 'mediaplugin').')</span>
<script type="text/javascript">
//<![CDATA[
  var FO = { movie:"'.$CFG->wwwroot.'/filter/mediaplugin/mp3player.swf?src='.$jsurl.'",
    width:"90", height:"15", majorversion:"6", build:"40", flashvars:"'.$c.'", quality: "high" };
  UFO.create(FO, "'.$id.'");
//]]>
</script>';
}

function filter_mediaplugin_ogg_callback($link) {
    global $CFG;

    static $count = 0;
    $count++;
    $id = 'filter_ogg_'.time().$count; //we need something unique because it might be stored in text cache

    $url = $link[1];
    $printlink = '<a href="'.$url.'">'.get_string('oggaudio', 'mediaplugin').'</a>';

    $unsupportedplugins = get_string('unsupportedplugins', 'mediaplugin', $printlink);
    $output = <<<OET
    <span class="mediaplugin mediaplugin_ogg" id="$id">
    <audio id="$id" src="$url" controls="true" width="100">
        $unsupportedplugins
    </audio>
    </span>
OET;

    return $output;
}

function filter_mediaplugin_ogv_callback($link) {
    global $CFG;

    static $count = 0;
    $count++;
    $id = 'filter_ogv_'.time().$count; //we need something unique because it might be stored in text cache

    $url = $link[1];
    $printlink = '<a href="'.$url.'">'.get_string('ogvvideo', 'mediaplugin').'</a>';

    $unsupportedplugins = get_string('unsupportedplugins', 'mediaplugin', $printlink);
    $output = <<<OET
    <span class="mediaplugin mediaplugin_ogv" id="$id">
    <video id="$id" src="$url" controls="true" width="600" >
        $unsupportedplugins
    </video>
    </span>
OET;

    return $output;
}

function mediaplugin_filter_swf_callback($link) {
    static $count = 0;
    $count++;
    $id = 'filter_swf_'.time().$count; //we need something unique because it might be stored in text cache

    $width  = empty($link[3]) ? '400' : $link[3];
    $height = empty($link[4]) ? '300' : $link[4];
    $url = $link[1];
    $jsurl = addslashes_js($link[1]);
    $printlink = '<a href="'.$url.'">'.get_string('flashvideo', 'mediaplugin').'</a>';

    return $printlink.
'<span class="mediaplugin mediaplugin_swf" id="'.$id.'">('.get_string('flashanimation', 'mediaplugin').')</span>
<script type="text/javascript">
//<![CDATA[
  var FO = { movie:"'.$jsurl.'", width:"'.$width.'", height:"'.$height.'", majorversion:"6", build:"40",
    allowscriptaccess:"never", quality: "high" };
  UFO.create(FO, "'.$id.'");
//]]>
</script>';
}

function mediaplugin_filter_flv_callback($link) {
    global $CFG;

    static $count = 0;
    $count++;
    $id = 'filter_flv_'.time().$count; //we need something unique because it might be stored in text cache

    $width  = empty($link[3]) ? '480' : $link[3];
    $height = empty($link[4]) ? '360' : $link[4];
    $url = $link[1];
    $jsurl = addslashes_js($link[1]);
    $printlink = '<a href="'.$url.'">'.get_string('flashvideo', 'mediaplugin').'</a>';

    return $printlink.
'<span class="mediaplugin mediaplugin_flv" id="'.$id.'">('.get_string('flashvideo', 'mediaplugin').')</span>
<script type="text/javascript">
//<![CDATA[
  var FO = { movie:"'.$CFG->wwwroot.'/filter/mediaplugin/flvplayer.swf?file='.$jsurl.'",
    width:"'.$width.'", height:"'.$height.'", majorversion:"6", build:"40",
    allowscriptaccess:"never", quality: "high", allowfullscreen: "true" };
  UFO.create(FO, "'.$id.'");
//]]>
</script>';
}

function mediaplugin_filter_real_callback($link, $autostart=false) {
    $url = $link[1];
    $jsurl = addslashes_js($link[1]);
    $mimetype = mimeinfo('type', $url);
    $autostart = $autostart ? 'true' : 'false';
    $printlink = '<a href="'.$url.'">'.get_string('realaudio', 'mediaplugin').'</a>';

// embed kept for now see MDL-8674
    return $printlink.
'<span class="mediaplugin mediaplugin_real">
<script type="text/javascript">
//<![CDATA[
document.write(\'<object classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" width="240" height="180">\\
  <param name="src" value="'.$jsurl.'" />\\
  <param name="autostart" value="'.$autostart.'" />\\
  <param name="controls" value="imagewindow" />\\
  <param name="console" value="video" />\\
  <param name="loop" value="true" />\\
  <embed src="'.$jsurl.'" width="240" height="180" loop="true" type="'.$mimetype.'" controls="imagewindow" console="video" autostart="'.$autostart.'" />\\
  </object><br />\\
  <object classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" width="240" height="30">\\
  <param name="src" value="'.$jsurl.'" />\\
  <param name="autostart" value="'.$autostart.'" />\\
  <param name="controls" value="ControlPanel" />\\
  <param name="console" value="video" />\\
  <embed src="'.$jsurl.'" width="240" height="30" controls="ControlPanel" type="'.$mimetype.'" console="video" autostart="'.$autostart.'" />\\
  </object>\');
//]]>
</script></span>';
}

/**
 * Change links to Youtube into embedded Youtube videos
 */
function mediaplugin_filter_youtube_callback($link, $autostart=false) {

    $site = s($link[1]);
    $url = $link[2];
    $info = s($link[3]);

    return '<span class="mediaplugin mediaplugin_youtube">'.
           '<object title="'.$info.'"
                    class="mediaplugin mediaplugin_youtube" type="application/x-shockwave-flash"
                    data="'.$site.'youtube.com/v/'.$url.'&amp;fs=1&amp;rel=0" width="425" height="344">'.
           '<param name="movie" value="'.$site.'youtube.com/v/'.$url.'&amp;fs=1&amp;rel=0" />'.
           '<param name="FlashVars" value="playerMode=embedded" />'.
           '<param name="wmode" value="transparent" />'.
           '<param name="allowFullScreen" value="true" />'.
           '</object>'.
           '</span>';
}

/**
 * Embed video using window media player if available
 */
function mediaplugin_filter_wmp_callback($link, $autostart=false) {
    $url = $link[1];
    if (empty($link[3]) or empty($link[4])) {
        $mpsize = '';
        $size = 'width="300" height="260"';
        $autosize = 'true';
    } else {
        $size = 'width="'.$link[3].'" height="'.$link[4].'"';
        $mpsize = $size;
        $autosize = 'false';
    }
    $mimetype = mimeinfo('type', $url);
    $autostart = $autostart ? 'true' : 'false';
    $printlink = '<a href="'.$url.'">'.get_string('wmpvideo', 'mediaplugin').'</a>';

    return $printlink.
'<span class="mediaplugin mediaplugin_wmp">
<object classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6" '.$mpsize.'
  standby="Loading Microsoft(R) Windows(R) Media Player components..."
  type="application/x-oleobject">
 <param name="Filename" value="'.$url.'" />
 <param name="src" value="'.$url.'" />
 <param name="url" value="'.$url.'" />
 <param name="ShowControls" value="true" />
 <param name="AutoRewind" value="true" />
 <param name="AutoStart" value="'.$autostart.'" />
 <param name="Autosize" value="'.$autosize.'" />
 <param name="EnableContextMenu" value="true" />
 <param name="TransparentAtStart" value="false" />
 <param name="AnimationAtStart" value="false" />
 <param name="ShowGotoBar" value="false" />
 <param name="EnableFullScreenControls" value="true" />
<!--[if !IE]>-->
  <object data="'.$url.'" type="'.$mimetype.'" '.$size.'>
   <param name="src" value="'.$url.'" />
   <param name="controller" value="true" />
   <param name="autoplay" value="'.$autostart.'" />
   <param name="autostart" value="'.$autostart.'" />
   <param name="resize" value="scale" />
  </object>
<!--<![endif]-->
</object></span>';
}

function mediaplugin_filter_qt_callback($link, $autostart=false) {
    $url = $link[1];
    if (empty($link[3]) or empty($link[4])) {
        $size = 'width="280" height="210"';
    } else {
        $size = 'width="'.$link[3].'" height="'.$link[4].'"';
    }
    $mimetype = mimeinfo('type', $url);
    $autostart = $autostart ? 'true' : 'false';
    $printlink = '<a href="'.$url.'">'.get_string('quicktime', 'mediaplugin').'</a>';

    return $printlink.
'<span class="mediaplugin mediaplugin_qt">
<object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
  codebase="http://www.apple.com/qtactivex/qtplugin.cab" '.$size.'>
 <param name="pluginspage" value="http://www.apple.com/quicktime/download/" />
 <param name="src" value="'.$url.'" />
 <param name="controller" value="true" />
 <param name="loop" value="true" />
 <param name="autoplay" value="'.$autostart.'" />
 <param name="autostart" value="'.$autostart.'" />
 <param name="scale" value="aspect" />
<!--[if !IE]>-->
  <object data="'.$url.'" type="'.$mimetype.'" '.$size.'>
   <param name="src" value="'.$url.'" />
   <param name="pluginurl" value="http://www.apple.com/quicktime/download/" />
   <param name="controller" value="true" />
   <param name="loop" value="true" />
   <param name="autoplay" value="'.$autostart.'" />
   <param name="autostart" value="'.$autostart.'" />
   <param name="scale" value="aspect" />
  </object>
<!--<![endif]-->
</object></span>';
}

?>
