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filter.php
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filter.php
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<?php // $Id$
//////////////////////////////////////////////////////////////
// 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.*?href="([^<]+\.mp3)"[^>]*>.*?<\/a>/is';
$newtext = preg_replace_callback($search, 'mediaplugin_filter_mp3_callback', $newtext);
}
if ($CFG->filter_mediaplugin_enable_swf) {
$search = '/<a.*?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.*?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.*?href="([^<]+\.mov)(\?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.*?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.*?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.*?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.*?href="([^<]+\.ram)"[^>]*>.*?<\/a>/is';
$newtext = preg_replace_callback($search, 'mediaplugin_filter_real_callback', $newtext);
}
if ($CFG->filter_mediaplugin_enable_rpm) {
$search = '/<a.*?href="([^<]+\.rpm)"[^>]*>.*?<\/a>/is';
$newtext = preg_replace_callback($search, 'mediaplugin_filter_real_callback', $newtext);
}
if ($CFG->filter_mediaplugin_enable_rm) {
$search = '/<a.*?href="([^<]+\.rm)"[^>]*>.*?<\/a>/is';
$newtext = preg_replace_callback($search, 'mediaplugin_filter_real_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';
}
$c = htmlentities($c);
static $count = 0;
$count++;
$id = 'filter_mp3_'.time().$count; //we need something unique because it might be stored in text cache
$div_id = 'filter_mp3player_'.time().$count;
$url = addslashes_js($link[1]);
return $link[0].
'<span class="mediaplugin mediaplugin_mp3" id="'.$id.'">('.get_string('mp3audio', 'mediaplugin').')</span>
<div id="'.$div_id.'" class="mediaplugin_mp3"></div>
<script type="text/javascript">
//<![CDATA[
var FO = { movie:"'.$CFG->wwwroot.'/filter/mediaplugin/mp3player.swf?src='.$url.'",
width:"90", height:"15", majorversion:"6", build:"40", flashvars:"'.$c.'", quality: "high" };
UFO.create(FO, "'.$div_id.'");
//]]>
</script>';
}
function mediaplugin_filter_swf_callback($link) {
static $count = 0;
$count++;
$id = 'filter_swf_'.time().$count; //we need something unique because it might be stored in text cache
$div_id = 'filter_swfplayer_'.time().$count;
$width = empty($link[3]) ? '400' : $link[3];
$height = empty($link[4]) ? '300' : $link[4];
$url = addslashes_js($link[1]);
return $link[0].
'<span class="mediaplugin mediaplugin_swf" id="'.$id.'">('.get_string('flashanimation', 'mediaplugin').')</span>
<div id="'.$div_id.'" class="mediaplugin_swf"></div>
<script type="text/javascript">
//<![CDATA[
var FO = { movie:"'.$url.'", width:"'.$width.'", height:"'.$height.'", majorversion:"6", build:"40",
allowscriptaccess:"never", quality: "high" };
UFO.create(FO, "'.$div_id.'");
//]]>
</script>';
}
function mediaplugin_filter_flv_callback($link) {
global $CFG;
static $count = 0;
$count++;
$id = 'filter_flv_'.time().$count; //we need something unique because it might be stored in text cache
$div_id = 'filter_flvplayer_'.time().$count;
$width = empty($link[3]) ? '480' : $link[3];
$height = empty($link[4]) ? '360' : $link[4];
$url = addslashes_js($link[1]);
return $link[0].
'<span class="mediaplugin mediaplugin_flv" id="'.$id.'">('.get_string('flashvideo', 'mediaplugin').')</span>
<div id="'.$div_id.'" class="mediaplugin_flv"></div>
<script type="text/javascript">
//<![CDATA[
var FO = { movie:"'.$CFG->wwwroot.'/filter/mediaplugin/flvplayer.swf?file='.$url.'",
width:"'.$width.'", height:"'.$height.'", majorversion:"6", build:"40",
allowscriptaccess:"never", quality: "high" };
UFO.create(FO, "'.$div_id.'");
//]]>
</script>';
}
function mediaplugin_filter_real_callback($link, $autostart=false) {
$url = addslashes_js($link[1]);
$mimetype = mimeinfo('type', $url);
$autostart = $autostart ? 'true' : 'false';
// embed kept for now see MDL-8674
return $link[0].
'<span class="mediaplugin mediaplugin_real">
<script type="text/javascript">
//<![CDATA[
document.write(\'<object classid="clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA" width="240" height="180">\\
<param name="src" value="'.$url.'" />\\
<param name="autostart" value="'.$autostart.'" />\\
<param name="controls" value="imagewindow" />\\
<param name="console" value="video" />\\
<param name="loop" value="true" />\\
<embed src="'.$url.'" 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="'.$url.'" />\\
<param name="autostart" value="'.$autostart.'" />\\
<param name="controls" value="ControlPanel" />\\
<param name="console" value="video" />\\
<embed src="'.$url.'" width="240" height="30" controls="ControlPanel" type="'.$mimetype.'" console="video" autostart="'.$autostart.'" />\\
</object>\');
//]]>
</script></span>';
}
/**
* Embed video using window media player if available
*/
function mediaplugin_filter_wmp_callback($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';
return $link[0].
'<span class="mediaplugin mediaplugin_wmp">
<object classid="CLSID:6BF52A52-394A-11d3-B153-00C04F79FAA6" '.$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';
return $link[0].
'<span class="mediaplugin mediaplugin_qt">
<object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
codebase="http://www.apple.com/qtactivex/qtplugin.cab" '.$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>';
}
?>