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<?php |
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require_once( AMP__ROOT__ . '/includes/sanitizers/class-amp-base-sanitizer.php' ); |
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/** |
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* Collects inline styles and outputs them in the amp-custom stylesheet. |
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*/ |
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class AMP_Style_Sanitizer extends AMP_Base_Sanitizer { |
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private $styles = array(); |
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public function get_styles() { |
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return $this->styles; |
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} |
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public function sanitize() { |
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$body = $this->get_body_node(); |
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$this->collect_styles_recursive( $body ); |
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} |
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private function collect_styles_recursive( $node ) { |
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if ( $node->nodeType !== XML_ELEMENT_NODE ) { |
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return; |
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} |
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if ( $node->hasAttributes() && $node instanceof DOMElement ) { |
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$style = $node->getAttribute( 'style' ); |
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$class = $node->getAttribute( 'class' ); |
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if ( $style ) { |
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$style = $this->process_style( $style ); |
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if ( ! empty( $style ) ) { |
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$class_name = $this->generate_class_name( $style ); |
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$new_class = trim( $class . ' ' . $class_name ); |
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$node->setAttribute( 'class', $new_class ); |
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$this->styles[ '.' . $class_name ] = $style; |
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} |
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$node->removeAttribute( 'style' ); |
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} |
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} |
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$length = $node->childNodes->length; |
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for ( $i = $length - 1; $i >= 0; $i -- ) { |
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$child_node = $node->childNodes->item( $i ); |
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$this->collect_styles_recursive( $child_node ); |
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} |
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} |
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private function process_style( $string ) { |
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// Filter properties |
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$string = safecss_filter_attr( esc_html( $string ) ); |
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if ( ! $string ) { |
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return array(); |
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} |
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// Normalize order |
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$styles = array_map( 'trim', explode( ';', $string ) ); |
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sort( $styles ); |
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$processed_styles = array(); |
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// Normalize whitespace and filter rules |
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foreach ( $styles as $index => $rule ) { |
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$arr2 = array_map( 'trim', explode( ':', $rule, 2 ) ); |
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if ( 2 !== count( $arr2 ) ) { |
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continue; |
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} |
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list( $property, $value ) = $this->filter_style( $arr2[0], $arr2[1] ); |
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if ( empty( $property ) || empty( $value ) ) { |
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continue; |
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} |
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$processed_styles[ $index ] = $property . ':' . $value; |
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} |
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return $processed_styles; |
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} |
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private function filter_style( $property, $value ) { |
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// Handle overflow rule |
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// https://www.ampproject.org/docs/reference/spec.html#properties |
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if ( 0 === strpos( $property, 'overflow' ) |
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&& ( false !== strpos( $value, 'auto' ) || false !== strpos( $value, 'scroll' ) ) |
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) { |
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return false; |
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} |
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if ( 'width' === $property ) { |
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$property = 'max-width'; |
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} |
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// !important is not allowed |
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if ( false !== strpos( $value, 'important' ) ) { |
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$value = preg_replace( '/\s*\!\s*important$/', '', $value ); |
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} |
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return array( $property, $value ); |
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} |
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private function generate_class_name( $data ) { |
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$string = maybe_serialize( $data ); |
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return 'amp-wp-inline-' . md5( $string ); |
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} |
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} |
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Automattic /
jetpack
