block_tag_youtube.php 5.2 KB
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<?php 

require_once($CFG->dirroot.'/tag/lib.php');
require_once($CFG->libdir . '/magpie/rss_cache.inc');

define('YOUTUBE_DEV_KEY', 'PGm8FdJXS8Q');
define('DEFAULT_NUMBER_OF_VIDEOS', 5);
define('YOUTUBE_CACHE_EXPIRATION', 1800);

class block_tag_youtube extends block_base {

    function init() {
        $this->title = get_string('blockname','block_tag_youtube');
        $this->version = 2007080800;
    }

    function applicable_formats() {
        return array('tag' => true);
    }

    function specialization() {
        $this->title = !empty($this->config->title) ? $this->config->title : get_string('blockname', 'block_tag_youtube');
    }

    function instance_allow_multiple() {
        return true;
    }

    function get_content() {


        if ($this->content !== NULL) {
            return $this->content;
        }


        if(!empty($this->config->playlist)){
            //videos from a playlist
            $text = $this->get_videos_by_playlist();
        }
        else{
            if(!empty($this->config->category)){
                //videos from category with tag
                $text = $this->get_videos_by_tag_and_category();
            }
            else {
                //videos with tag
                $text = $this->get_videos_by_tag();
            }
        }

        $this->content = new stdClass;
        $this->content->text = $text;
        $this->content->footer = '';

        return $this->content;

    }

    function get_videos_by_playlist(){

        $numberofvideos = DEFAULT_NUMBER_OF_VIDEOS;
        if( !empty($this->config->numberofvideos)) {
            $numberofvideos = $this->config->numberofvideos;
        }

        $request = 'http://www.youtube.com/api2_rest?method=youtube.videos.list_by_playlist';
        $request .= '&dev_id=' . YOUTUBE_DEV_KEY;
        $request .= "&id={$this->config->playlist}";
        $request .= "&page=1";
        $request .= "&per_page={$numberofvideos}";

        return $this->fetch_request($request);

    }

    function get_videos_by_tag(){

        $tagid       = optional_param('id',     0,      PARAM_INT);   // tag id

        $query_tag = tag_display_name(tag_by_id($tagid));
        $query_tag = urlencode($query_tag);

        $numberofvideos = DEFAULT_NUMBER_OF_VIDEOS;
        if( !empty($this->config->numberofvideos)) {
            $numberofvideos = $this->config->numberofvideos;
        }

        $request = 'http://www.youtube.com/api2_rest?method=youtube.videos.list_by_tag';
        $request .= '&dev_id=' . YOUTUBE_DEV_KEY;
        $request .= "&tag={$query_tag}";
        $request .= "&page=1";
        $request .= "&per_page={$numberofvideos}";

        return $this->fetch_request($request);

    }

    function get_videos_by_tag_and_category(){

        $tagid       = optional_param('id',     0,      PARAM_INT);   // tag id

        $query_tag = tag_display_name(tag_by_id($tagid));
        $query_tag = urlencode($query_tag);

        $numberofvideos = DEFAULT_NUMBER_OF_VIDEOS;
        if( !empty($this->config->numberofvideos)) {
            $numberofvideos = $this->config->numberofvideos;
        }

        $request = 'http://www.youtube.com/api2_rest?method=youtube.videos.list_by_category_and_tag';
        $request .= '&category_id='.$this->config->category;
        $request .= '&dev_id=' . YOUTUBE_DEV_KEY;
        $request .= "&tag={$query_tag}";
        $request .= "&page=1";
        $request .= "&per_page={$numberofvideos}";

        return $this->fetch_request($request); 
    }

   function fetch_request($request){
        
        global $CFG;
        
        $cache = new RSSCache($CFG->dataroot . '/cache',YOUTUBE_CACHE_EXPIRATION);
        $cache_status = $cache->check_cache( $request);

        if ( $cache_status == 'HIT' ) {
            $cached_response = $cache->get( $request );

            $simplexmlobj = new SimpleXMLElement($cached_response);
            return $this->render_video_list($simplexmlobj);
        }

        if ( $cache_status == 'STALE' ) {
            $cached_response = $cache->get( $request );
        }

        $response = file_get_contents($request);

        if(empty($response)){
            $response = $cached_response;
        }
        else{
            $cache->set($request, $response);    
        }

        $simplexmlobj = new SimpleXMLElement($response);
        return $this->render_video_list($simplexmlobj);        
    }
        
    function render_video_list($simplexmlobj){

        $text = '';
        $text .= '<table class="yt-video-entry">';
        foreach($simplexmlobj->video_list->video as $video){
            $text .= '<tr>';
            $text .= '<td>';
            $text .= '<a href="'. $video->url . '">';
            $text .= '<img class="youtube-thumb" title="'.$video->title.'" style="padding:3px;" src="' . $video->thumbnail_url . '"/>' ;
            $text .= "</a>";
            $text .= "</td>";
            $text .= '<td>';
            $text .= '<a href="'. $video->url . '">'.$video->title. '</a>';
            $text .= '<br/>';
            $text .= format_time($video->length_seconds);
            $text .= '<br/>';
            $text .= 'views: ' . $video->view_count ;
            $text .= '</td>';
            $text .= '</tr>';
        }
        $text .= '</table>';

        return $text;
    }
}
?>