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<?php /** * Class AMP_YouTube_Embed_Handler * * @package AMP / /* * Class AMP_YouTube_Embed_Handler * * Much of this class is borrowed from Jetpack embeds. * * @internal / class AMP_YouTube_Embed_Handler extends AMP_Base_Embed_Handler { /* * URL pattern to match YouTube videos. * * Only handling single videos. Playlists are handled elsewhere. * * @deprecated No longer used. * @internal * @var string / const URL_PATTERN = '#https?://(?:www\.)?(?:youtube.com/(?:v/\|e/\|embed/\|watch[/\#?])\|youtu\.be/).#i'; /** * Ratio for calculating the default height from the content width. * * @param float / const RATIO = 0.5625; /* * Default width. * * @var int / protected $DEFAULT_WIDTH = 600; /* * Default height. * * @var int / protected $DEFAULT_HEIGHT = 338; /* * AMP_YouTube_Embed_Handler constructor. * * @param array $args Height, width and maximum width for embed. / public function __construct( $args = [] ) { parent::__construct( $args ); if ( isset( $this->args['content_max_width'] ) ) { // Set default width/height; these will be overridden by whatever YouTube specifies. $max_width = $this->args['content_max_width']; $this->args['width'] = $max_width; $this->args['height'] = round( $max_width self::RATIO ); } } /** * Register embed. / public function register_embed() { add_filter( 'embed_oembed_html', [ $this, 'filter_embed_oembed_html' ], 10, 2 ); add_filter( 'wp_video_shortcode_override', [ $this, 'video_override' ], 10, 2 ); } /* * Unregister embed. / public function unregister_embed() { remove_filter( 'embed_oembed_html', [ $this, 'filter_embed_oembed_html' ], 10 ); } /* * Filter oEmbed HTML for YouTube to convert to AMP. * * @param string $cache Cache for oEmbed. * @param string $url Embed URL. * @return string Embed. / public function filter_embed_oembed_html( $cache, $url ) { $id = $this->get_video_id_from_url( $url ); if ( ! $id ) { return $cache; } $props = $this->parse_props( $cache, $url, $id ); if ( empty( $props ) ) { return $cache; } $props['video_id'] = $id; return $this->render( $props, $url ); } /* * Parse AMP component from iframe. * * @param string $html HTML. * @param string $url Embed URL, for fallback purposes. * @param string $video_id YouTube video ID. * @return array\|null Props for rendering the component, or null if unable to parse. / private function parse_props( $html, $url, $video_id ) { $props = $this->match_element_attributes( $html, 'iframe', [ 'title', 'height', 'width' ] ); if ( ! isset( $props ) ) { return null; } $img_attributes = [ 'src' => esc_url_raw( sprintf( 'https://i.ytimg.com/vi/%s/hqdefault.jpg', $video_id ) ), 'layout' => 'fill', 'object-fit' => 'cover', ]; if ( ! empty( $props['title'] ) ) { $img_attributes['alt'] = $props['title']; } $img = AMP_HTML_Utils::build_tag( 'img', $img_attributes ); $props['placeholder'] = AMP_HTML_Utils::build_tag( 'a', [ 'placeholder' => '', 'href' => esc_url_raw( $url ), ], $img ); return $props; } /* * Render embed. * * @param array $args Args. * @param string $url URL. * @return string Rendered. / public function render( $args, $url ) { $args = wp_parse_args( $args, [ 'video_id' => false, 'layout' => 'responsive', 'width' => $this->args['width'], 'height' => $this->args['height'], 'placeholder' => '', ] ); if ( empty( $args['video_id'] ) ) { return AMP_HTML_Utils::build_tag( 'a', [ 'href' => esc_url_raw( $url ), 'class' => 'amp-wp-embed-fallback', ], esc_html( $url ) ); } $this->did_convert_elements = true; $attributes = array_merge( [ 'data-videoid' => $args['video_id'] ], wp_array_slice_assoc( $args, [ 'layout', 'width', 'height' ] ) ); if ( ! empty( $args['title'] ) ) { $attributes['title'] = $args['title']; } return AMP_HTML_Utils::build_tag( 'amp-youtube', $attributes, $args['placeholder'] ); } /* * Determine the video ID from the URL. * * @param string $url URL. * @return string\|false Video ID, or false if none could be retrieved. / private function get_video_id_from_url( $url ) { $parsed_url = wp_parse_url( $url ); if ( ! isset( $parsed_url['host'] ) ) { return false; } $domain = implode( '.', array_slice( explode( '.', $parsed_url['host'] ), -2 ) ); if ( ! in_array( $domain, [ 'youtu.be', 'youtube.com', 'youtube-nocookie.com' ], true ) ) { return false; } if ( ! isset( $parsed_url['path'] ) ) { return false; } $segments = explode( '/', trim( $parsed_url['path'], '/' ) ); $query_vars = []; if ( isset( $parsed_url['query'] ) ) { wp_parse_str( $parsed_url['query'], $query_vars ); // Handle video ID in v query param, e.g. <https://www.youtube.com/watch?v=XOY3ZUO6P0k>. // Support is also included for other query params which don't appear to be supported by YouTube anymore. if ( isset( $query_vars['v'] ) ) { return $query_vars['v']; } elseif ( isset( $query_vars['vi'] ) ) { return $query_vars['vi']; } } if ( empty( $segments[0] ) ) { return false; } // For shortened URLs like <http://youtu.be/XOY3ZUO6P0k>, the slug is the first path segment. if ( 'youtu.be' === $parsed_url['host'] ) { return $segments[0]; } // For non-shortened URLs, the video ID is in the second path segment. For example: // https://www.youtube.com/watch/XOY3ZUO6P0k // * https://www.youtube.com/embed/XOY3ZUO6P0k // Other top-level segments indicate non-video URLs. There are examples of URLs having segments including // 'v', 'vi', and 'e' but these do not work anymore. In any case, they are added here for completeness. if ( ! empty( $segments[1] ) && in_array( $segments[0], [ 'embed', 'watch', 'v', 'vi', 'e' ], true ) ) { return $segments[1]; } return false; } /** * Override the output of YouTube videos. * * This overrides the value in wp_video_shortcode(). * The pattern matching is copied from WP_Widget_Media_Video::render(). * * @param string $html Empty variable to be replaced with shortcode markup. * @param array $attr The shortcode attributes. * @return string\|null $markup The markup to output. */ public function video_override( $html, $attr ) { if ( ! isset( $attr['src'] ) ) { return $html; } $video_id = $this->get_video_id_from_url( $attr['src'] ); if ( ! $video_id ) { return $html; } return $this->render( compact( 'video_id' ), $attr['src'] ); } }

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