awsmug/alexa-sdk

<?php

namespace Alexa\Media;

class Podcast_Skill extends Player_Skill {
    /**
     * URL to podcast Feed
     *
     * @since 1.0.0
     *
     * @var string
     */
    protected $podcast_url;

    protected $text_launch = 'This is a Podcast.';

    protected $text_start = 'Playing episode %s.';

    protected $text_item_not_found = 'Podcast not found. Please choose an number between %d and %d.';

    protected $text_playback_failed = 'Playback of Podcast file failed.';

    protected $reverse_playlist = true;

    public function __construct( $application_id ) {
        parent::__construct( $application_id );
    }

    public function intent_request() {
        $this->add_podcast_files();
        parent::intent_request();
    }

    private function get_feed_media() {
        $dom = new \DOMDocument();
        $dom->load( $this->podcast_url, LIBXML_NOWARNING );
        $media_files = array();

        foreach ( $dom->getElementsByTagName( 'item' ) as $node ) {
            $url  = $node->getElementsByTagName( 'enclosure' )->item( 0 )->getAttribute( 'url' );
            $item = array(
                'title' => $node->getElementsByTagName( 'title' )->item( 0 )->nodeValue,
                /*
                'link' => $node->getElementsByTagName('link')->item(0)->nodeValue,
                'guid' => $node->getElementsByTagName('guid')->item(0)->nodeValue,
                'enclosure' => $node->getElementsByTagName('enclosure')->item(0)->nodeValue,
                'image' => $node->getElementsByTagName( 'image' )->item(0)->getAttribute( 'href' ),
                */
                'url'   => $url
            );
            array_push( $media_files, $item );
        }

        return $media_files;
    }

    private function add_podcast_files() {
        $media_files = $this->get_feed_media();

        foreach ( $media_files AS $media_file ) {
            $this->playlist_add( $media_file['url'], $media_file['title'] );
        }

        if ( $this->reverse_playlist ) {
            $this->playlist_reverse();
        }
    }
}