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