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msd2/wordpress/wp-content/plugins/amp/includes/embeds/class-amp-twitter-embed.php

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+<?php
+/**
+ * Class AMP_Twitter_Embed_Handler
+ *
+ * @package AMP
+ */
+
+/**
+ * Class AMP_Twitter_Embed_Handler
+ *
+ *  Much of this class is borrowed from Jetpack embeds
+ */
+class AMP_Twitter_Embed_Handler extends AMP_Base_Embed_Handler {
+
+	/**
+	 * URL pattern for a Tweet URL.
+	 *
+	 * @since 0.2
+	 * @var string
+	 */
+	const URL_PATTERN = '#https?:\/\/twitter\.com(?:\/\#\!\/|\/)(?P<username>[a-zA-Z0-9_]{1,20})\/status(?:es)?\/(?P<tweet>\d+)#i';
+
+	/**
+	 * URL pattern for a Twitter timeline.
+	 *
+	 * @since 1.0
+	 * @var string
+	 */
+	const URL_PATTERN_TIMELINE = '#https?:\/\/twitter\.com(?:\/\#\!\/|\/)(?P<username>[a-zA-Z0-9_]{1,20})(?:$|\/(?P<type>likes|lists)(\/(?P<id>[a-zA-Z0-9_-]+))?)#i';
+
+	/**
+	 * Tag.
+	 *
+	 * @var string embed HTML blockquote tag to identify and replace with AMP version.
+	 */
+	protected $sanitize_tag = 'blockquote';
+
+	/**
+	 * Tag.
+	 *
+	 * @var string AMP amp-facebook tag
+	 */
+	private $amp_tag = 'amp-twitter';
+
+	/**
+	 * Registers embed.
+	 */
+	public function register_embed() {
+		add_shortcode( 'tweet', array( $this, 'shortcode' ) ); // Note: This is a Jetpack shortcode.
+		wp_embed_register_handler( 'amp-twitter', self::URL_PATTERN, array( $this, 'oembed' ), -1 );
+		wp_embed_register_handler( 'amp-twitter-timeline', self::URL_PATTERN_TIMELINE, array( $this, 'oembed_timeline' ), -1 );
+	}
+
+	/**
+	 * Unregisters embed.
+	 */
+	public function unregister_embed() {
+		remove_shortcode( 'tweet' ); // Note: This is a Jetpack shortcode.
+		wp_embed_unregister_handler( 'amp-twitter', -1 );
+		wp_embed_unregister_handler( 'amp-twitter-timeline', -1 );
+	}
+
+	/**
+	 * Gets AMP-compliant markup for the Twitter shortcode.
+	 *
+	 * Note that this shortcode is is defined in Jetpack.
+	 *
+	 * @param array $attr The Twitter attributes.
+	 * @return string Twitter shortcode markup.
+	 */
+	public function shortcode( $attr ) {
+		$attr = wp_parse_args(
+			$attr,
+			array(
+				'tweet' => false,
+			)
+		);
+
+		if ( empty( $attr['tweet'] ) && ! empty( $attr[0] ) ) {
+			$attr['tweet'] = $attr[0];
+		}
+
+		$id = false;
+		if ( is_numeric( $attr['tweet'] ) ) {
+			$id = $attr['tweet'];
+		} else {
+			preg_match( self::URL_PATTERN, $attr['tweet'], $matches );
+			if ( isset( $matches['tweet'] ) && is_numeric( $matches['tweet'] ) ) {
+				$id = $matches['tweet'];
+			}
+
+			if ( empty( $id ) ) {
+				return '';
+			}
+		}
+
+		$this->did_convert_elements = true;
+
+		return AMP_HTML_Utils::build_tag(
+			$this->amp_tag,
+			array(
+				'data-tweetid' => $id,
+				'layout'       => 'responsive',
+				'width'        => $this->args['width'],
+				'height'       => $this->args['height'],
+			)
+		);
+	}
+
+	/**
+	 * Render oEmbed.
+	 *
+	 * @see \WP_Embed::shortcode()
+	 *
+	 * @param array $matches URL pattern matches.
+	 * @return string Rendered oEmbed.
+	 */
+	public function oembed( $matches ) {
+		$id = false;
+
+		if ( isset( $matches['tweet'] ) && is_numeric( $matches['tweet'] ) ) {
+			$id = $matches['tweet'];
+		}
+
+		if ( ! $id ) {
+			return '';
+		}
+
+		return $this->shortcode( array( 'tweet' => $id ) );
+	}
+
+	/**
+	 * Render oEmbed for a timeline.
+	 *
+	 * @since 1.0
+	 *
+	 * @param array $matches URL pattern matches.
+	 * @return string Rendered oEmbed.
+	 */
+	public function oembed_timeline( $matches ) {
+		if ( ! isset( $matches['username'] ) ) {
+			return '';
+		}
+
+		$attributes = array(
+			'data-timeline-source-type' => 'profile',
+			'data-timeline-screen-name' => $matches['username'],
+		);
+
+		if ( isset( $matches['type'] ) ) {
+			switch ( $matches['type'] ) {
+				case 'likes':
+					$attributes['data-timeline-source-type'] = 'likes';
+					break;
+				case 'lists':
+					if ( ! isset( $matches['id'] ) ) {
+						return '';
+					}
+					$attributes['data-timeline-source-type']       = 'list';
+					$attributes['data-timeline-slug']              = $matches['id'];
+					$attributes['data-timeline-owner-screen-name'] = $attributes['data-timeline-screen-name'];
+					unset( $attributes['data-timeline-screen-name'] );
+					break;
+				default:
+					return '';
+			}
+		}
+
+		$attributes['layout'] = 'responsive';
+		$attributes['width']  = $this->args['width'];
+		$attributes['height'] = $this->args['height'];
+
+		$this->did_convert_elements = true;
+
+		return AMP_HTML_Utils::build_tag( $this->amp_tag, $attributes );
+	}
+
+	/**
+	 * Sanitized <blockquote class="twitter-tweet"> tags to <amp-twitter>.
+	 *
+	 * @param DOMDocument $dom DOM.
+	 */
+	public function sanitize_raw_embeds( $dom ) {
+		/**
+		 * Node list.
+		 *
+		 * @var DOMNodeList $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;
+			}
+
+			if ( $this->is_tweet_raw_embed( $node ) ) {
+				$this->create_amp_twitter_and_replace_node( $dom, $node );
+			}
+		}
+	}
+
+	/**
+	 * Checks whether it's a twitter blockquote or not
+	 *
+	 * @param DOMElement $node The DOMNode to adjust and replace.
+	 * @return bool Whether node is for raw embed.
+	 */
+	private function is_tweet_raw_embed( $node ) {
+		$class_attr = $node->getAttribute( 'class' );
+
+		return null !== $class_attr && false !== strpos( $class_attr, 'twitter-tweet' );
+	}
+
+	/**
+	 * Make final modifications to DOMNode
+	 *
+	 * @param DOMDocument $dom The HTML Document.
+	 * @param DOMElement  $node The DOMNode to adjust and replace.
+	 */
+	private function create_amp_twitter_and_replace_node( $dom, $node ) {
+		$tweet_id = $this->get_tweet_id( $node );
+		if ( ! $tweet_id ) {
+			return;
+		}
+
+		$new_node = AMP_DOM_Utils::create_node(
+			$dom,
+			$this->amp_tag,
+			array(
+				'width'        => $this->DEFAULT_WIDTH,
+				'height'       => $this->DEFAULT_HEIGHT,
+				'layout'       => 'responsive',
+				'data-tweetid' => $tweet_id,
+			)
+		);
+
+		$this->sanitize_embed_script( $node );
+
+		$node->parentNode->replaceChild( $new_node, $node );
+
+		$this->did_convert_elements = true;
+	}
+
+	/**
+	 * Extracts Tweet id.
+	 *
+	 * @param DOMElement $node The DOMNode to adjust and replace.
+	 * @return string Tweet ID.
+	 */
+	private function get_tweet_id( $node ) {
+		/**
+		 * DOMNode
+		 *
+		 * @var DOMNodeList $anchors
+		 */
+		$anchors = $node->getElementsByTagName( 'a' );
+
+		/**
+		 * Anchor.
+		 *
+		 * @type DOMElement $anchor
+		 */
+		foreach ( $anchors as $anchor ) {
+			$found = preg_match( self::URL_PATTERN, $anchor->getAttribute( 'href' ), $matches );
+			if ( $found ) {
+				return $matches['tweet'];
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * Removes Twitter's embed <script> tag.
+	 *
+	 * @param DOMElement $node The DOMNode to whose sibling is the instagram script.
+	 */
+	private function sanitize_embed_script( $node ) {
+		$next_element_sibling = $node->nextSibling;
+		while ( $next_element_sibling && ! ( $next_element_sibling instanceof DOMElement ) ) {
+			$next_element_sibling = $next_element_sibling->nextSibling;
+		}
+
+		$script_src = 'platform.twitter.com/widgets.js';
+
+		// Handle case where script is wrapped in paragraph by wpautop.
+		if ( $next_element_sibling instanceof DOMElement && 'p' === $next_element_sibling->nodeName ) {
+			$children = $next_element_sibling->getElementsByTagName( '*' );
+			if ( 1 === $children->length && 'script' === $children->item( 0 )->nodeName && false !== strpos( $children->item( 0 )->getAttribute( 'src' ), $script_src ) ) {
+				$next_element_sibling->parentNode->removeChild( $next_element_sibling );
+				return;
+			}
+		}
+
+		// Handle case where script is immediately following.
+		$is_embed_script = (
+			$next_element_sibling
+			&&
+			'script' === strtolower( $next_element_sibling->nodeName )
+			&&
+			false !== strpos( $next_element_sibling->getAttribute( 'src' ), $script_src )
+		);
+		if ( $is_embed_script ) {
+			$next_element_sibling->parentNode->removeChild( $next_element_sibling );
+		}
+	}
+}