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<?php /** * Class AMP_Facebook_Embed_Handler * * @package AMP */
use AmpProject\Dom\Document;
/** * Class AMP_Facebook_Embed_Handler * * @internal */ class AMP_Facebook_Embed_Handler extends AMP_Base_Embed_Handler {
/** * URL pattern. * * @var string */ const URL_PATTERN = '#https?://(www\.)?facebook\.com/.*#i';
/** * Default width. * * @var int */ protected $DEFAULT_WIDTH = 600;
/** * Default height. * * @var int */ protected $DEFAULT_HEIGHT = 400;
/** * Tag. * * @var string embed HTML blockquote tag to identify and replace with AMP version. */ protected $sanitize_tag = 'div';
/** * Tag. * * @var string AMP amp-facebook tag */ private $amp_tag = 'amp-facebook';
/** * Registers embed. */ public function register_embed() { wp_embed_register_handler( $this->amp_tag, self::URL_PATTERN, [ $this, 'oembed' ], -1 ); }
/** * Unregisters embed. */ public function unregister_embed() { wp_embed_unregister_handler( $this->amp_tag, -1 ); }
/** * WordPress oEmbed rendering callback. * * @param array $matches URL pattern matches. * @param array $attr Matched attributes. * @param string $url Matched URL. * @return string HTML markup for rendered embed. */ public function oembed( $matches, $attr, $url ) { return $this->render( [ 'url' => $url ] ); }
/** * Gets the rendered embed markup. * * @param array $args Embed rendering arguments. * @return string HTML markup for rendered embed. */ public function render( $args ) { $args = wp_parse_args( $args, [ 'url' => false, ] );
if ( empty( $args['url'] ) ) { return ''; }
$this->did_convert_elements = true;
return AMP_HTML_Utils::build_tag( $this->amp_tag, [ 'data-href' => $args['url'], 'layout' => 'responsive', 'width' => $this->args['width'], 'height' => $this->args['height'], ] ); }
/** * Sanitized <div class="fb-video" data-href=> tags to <amp-facebook>. * * @param Document $dom DOM. */ public function sanitize_raw_embeds( Document $dom ) { // If there were any previous embeds in the DOM that were wrapped by `wpautop()`, unwrap them. $embed_nodes = $dom->xpath->query( "//p/{$this->amp_tag}" ); if ( $embed_nodes->length ) { foreach ( $embed_nodes as $embed_node ) { $this->unwrap_p_element( $embed_node ); } }
$nodes = $dom->getElementsByTagName( $this->sanitize_tag ); $num_nodes = $nodes->length;
if ( 0 === $num_nodes ) { return; }
for ( $i = $num_nodes - 1; $i >= 0; $i-- ) { $node = $nodes->item( $i ); if ( ! $node instanceof DOMElement ) { continue; }
$embed_type = $this->get_embed_type( $node );
if ( null !== $embed_type ) { $this->create_amp_facebook_and_replace_node( $dom, $node, $embed_type ); } }
/* * Remove the fb-root div and the Facebook Connect JS script since irrelevant. * <div id="fb-root"></div> * <script async defer crossorigin="anonymous" src="https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v3.2"></script> */ $fb_root = $dom->getElementById( 'fb-root' ); if ( $fb_root ) { $script_elements = $dom->xpath->query( '//script[ starts-with( @src, "https://connect.facebook.net" ) and contains( @src, "sdk.js" ) ]' ); foreach ( $script_elements as $script ) { $parent_node = $script->parentNode; $parent_node->removeChild( $script );
// Remove parent node if it is an empty <p> tag. if ( 'p' === $parent_node->nodeName && null === $parent_node->firstChild ) { $parent_node->parentNode->removeChild( $parent_node ); } }
// Remove other instances of <div id="fb-root">. $fb_root_elements = $dom->xpath->query( '//div[ @id = "fb-root" ]' ); foreach ( $fb_root_elements as $fb_root ) { $fb_root->parentNode->removeChild( $fb_root ); } } }
/** * Get embed type. * * @param DOMElement $node The DOMNode to adjust and replace. * @return string|null Embed type or null if not detected. */ private function get_embed_type( DOMElement $node ) { $class_attr = $node->getAttribute( 'class' ); if ( null === $class_attr || ! $node->hasAttribute( 'data-href' ) ) { return null; }
if ( false !== strpos( $class_attr, 'fb-post' ) ) { return 'post'; }
if ( false !== strpos( $class_attr, 'fb-video' ) ) { return 'video'; }
if ( false !== strpos( $class_attr, 'fb-page' ) ) { return 'page'; }
if ( false !== strpos( $class_attr, 'fb-like' ) ) { return 'like'; }
if ( false !== strpos( $class_attr, 'fb-comments' ) ) { return 'comments'; }
if ( false !== strpos( $class_attr, 'fb-comment-embed' ) ) { return 'comment'; }
return null; }
/** * Create amp-facebook and replace node. * * @param Document $dom The HTML Document. * @param DOMElement $node The DOMNode to adjust and replace. * @param string $embed_type Embed type. */ private function create_amp_facebook_and_replace_node( Document $dom, DOMElement $node, $embed_type ) {
$attributes = [ // The layout sanitizer will convert this to `layout` when being sanitized. // The data attribute needs to be used so that the layout sanitizer will process it. 'data-amp-layout' => 'responsive', 'width' => $node->hasAttribute( 'data-width' ) ? $node->getAttribute( 'data-width' ) : $this->DEFAULT_WIDTH, 'height' => $node->hasAttribute( 'data-height' ) ? $node->getAttribute( 'data-height' ) : $this->DEFAULT_HEIGHT, ];
$node->removeAttribute( 'data-width' ); $node->removeAttribute( 'data-height' );
foreach ( $node->attributes as $attribute ) { if ( 'data-' === substr( $attribute->nodeName, 0, 5 ) ) { $attributes[ $attribute->nodeName ] = $attribute->nodeValue; } }
if ( 'page' === $embed_type ) { $amp_tag = 'amp-facebook-page'; } elseif ( 'like' === $embed_type ) { $amp_tag = 'amp-facebook-like'; } elseif ( 'comments' === $embed_type ) { $amp_tag = 'amp-facebook-comments'; } else { $amp_tag = $this->amp_tag;
$attributes['data-embed-as'] = $embed_type; }
$amp_facebook_node = AMP_DOM_Utils::create_node( $dom, $amp_tag, $attributes );
$fallback = null; foreach ( $node->childNodes as $child_node ) { if ( $child_node instanceof DOMElement && false !== strpos( $child_node->getAttribute( 'class' ), 'fb-xfbml-parse-ignore' ) ) { $fallback = $child_node; $child_node->parentNode->removeChild( $child_node ); $fallback->setAttribute( 'fallback', '' ); break; } }
$node->parentNode->replaceChild( $amp_facebook_node, $node ); if ( $fallback ) { $amp_facebook_node->appendChild( $fallback ); }
$this->did_convert_elements = true; } }
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