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<?php /** * Trait AMP_Noscript_Fallback. * * @package AMP */ use AmpProject\Dom\Document; /** * Trait AMP_Noscript_Fallback * * Used for sanitizers that place <noscript> tags with the original nodes on error. * * @since 1.1 * @internal */ 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 = []; /** * 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_keys( AMP_Allowed_Tags_Generated::get_allowed_attributes() ), true ); foreach ( AMP_Allowed_Tags_Generated::get_allowed_tag( $tag ) as $tag_spec ) { // Normally 1 iteration. foreach ( $tag_spec['attr_spec_list'] as $attr_name => $attr_spec ) { $this->noscript_fallback_allowed_attributes[ $attr_name ] = true; if ( isset( $attr_spec['alternative_names'] ) ) { $this->noscript_fallback_allowed_attributes = array_merge( $this->noscript_fallback_allowed_attributes, array_fill_keys( $attr_spec['alternative_names'], 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 DOMElement $new_element New element to append a noscript with the old element to. * @param DOMElement $old_element Old element to append in a noscript. * @param Document $dom DOM document instance. */ protected function append_old_node_noscript( DOMElement $new_element, DOMElement $old_element, Document $dom ) { $noscript = $dom->createElement( 'noscript' ); $noscript->appendChild( $old_element ); $new_element->appendChild( $noscript ); // Remove all non-allowed attributes preemptively to prevent doubled validation errors. for ( $i = $old_element->attributes->length - 1; $i >= 0; $i-- ) { $attribute = $old_element->attributes->item( $i ); if ( isset( $this->noscript_fallback_allowed_attributes[ $attribute->nodeName ] ) ) { continue; } $old_element->removeAttribute( $attribute->nodeName ); } } }
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