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msd2/wordpress/wp-content/plugins/amp/includes/sanitizers/trait-amp-noscript-fallback.php

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+<?php
+/**
+ * Trait AMP_Noscript_Fallback.
+ *
+ * @package AMP
+ */
+
+/**
+ * Trait AMP_Noscript_Fallback
+ *
+ * @since 1.1
+ *
+ * Used for sanitizers that place <noscript> tags with the original nodes on error.
+ */
+trait AMP_Noscript_Fallback {
+
+	/**
+	 * Attributes allowed on noscript fallback elements.
+	 *
+	 * This is used to prevent duplicated validation errors.
+	 *
+	 * @since 1.1
+	 * @var array
+	 */
+	private $noscript_fallback_allowed_attributes = array();
+
+	/**
+	 * Initializes the internal allowed attributes array.
+	 *
+	 * @since 1.1
+	 *
+	 * @param string $tag Tag name to get allowed attributes for.
+	 */
+	protected function initialize_noscript_allowed_attributes( $tag ) {
+		$this->noscript_fallback_allowed_attributes = array_fill_keys(
+			array_merge(
+				array_keys( current( AMP_Allowed_Tags_Generated::get_allowed_tag( $tag ) )['attr_spec_list'] ),
+				array_keys( AMP_Allowed_Tags_Generated::get_allowed_attributes() )
+			),
+			true
+		);
+	}
+
+	/**
+	 * Checks whether the given node is within an AMP-specific <noscript> element.
+	 *
+	 * @since 1.1
+	 *
+	 * @param \DOMNode $node DOM node to check.
+	 * @return bool True if in an AMP noscript element, false otherwise.
+	 */
+	protected function is_inside_amp_noscript( \DOMNode $node ) {
+		return 'noscript' === $node->parentNode->nodeName && $node->parentNode->parentNode && 'amp-' === substr( $node->parentNode->parentNode->nodeName, 0, 4 );
+	}
+
+	/**
+	 * Appends the given old node in a <noscript> element to the new node.
+	 *
+	 * @since 1.1
+	 *
+	 * @param \DOMNode     $new_node New node to append a noscript with the old node to.
+	 * @param \DOMNode     $old_node Old node to append in a noscript.
+	 * @param \DOMDocument $dom      DOM document instance.
+	 */
+	protected function append_old_node_noscript( \DOMNode $new_node, \DOMNode $old_node, \DOMDocument $dom ) {
+		$noscript = $dom->createElement( 'noscript' );
+		$noscript->appendChild( $old_node );
+		$new_node->appendChild( $noscript );
+
+		// Remove all non-allowed attributes preemptively to prevent doubled validation errors.
+		for ( $i = $old_node->attributes->length - 1; $i >= 0; $i-- ) {
+			$attribute = $old_node->attributes->item( $i );
+			if ( isset( $this->noscript_fallback_allowed_attributes[ $attribute->nodeName ] ) ) {
+				continue;
+			}
+			$old_node->removeAttribute( $attribute->nodeName );
+		}
+	}
+}