125 lines
4.4 KiB
PHP
125 lines
4.4 KiB
PHP
<?php
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/**
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* Class Meta_Sanitizer.
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*
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* @link https://github.com/googleforcreators/web-stories-wp
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*
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* @copyright 2020 Google LLC
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* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
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*/
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/**
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* Copyright 2020 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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declare(strict_types = 1);
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namespace Google\Web_Stories\AMP;
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use Google\Web_Stories_Dependencies\AMP_Meta_Sanitizer;
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use Google\Web_Stories_Dependencies\AmpProject\Html\Attribute;
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use Google\Web_Stories_Dependencies\AmpProject\Html\Tag;
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/**
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* Meta sanitizer.
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*
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* Sanitizes meta tags found in the header.
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*
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* This version avoids using amp_get_boilerplate_stylesheets().
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*
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* @since 1.1.0
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*
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* @see amp_get_boilerplate_stylesheets()
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* @see AMP_Meta_Sanitizer
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*/
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class Meta_Sanitizer extends AMP_Meta_Sanitizer {
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/**
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* Always ensure we have a style[amp-boilerplate] and a noscript>style[amp-boilerplate].
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*
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* The AMP boilerplate ({@link https://amp.dev/documentation/guides-and-tutorials/stories/learn/spec/amp-boilerplate}) styles should appear at the end of the head:
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* "Finally, specify the AMP boilerplate code. By putting the boilerplate code last, it prevents custom styles from
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* accidentally overriding the boilerplate css rules."
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*
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* @SuppressWarnings(PHPMD.NPathComplexity)
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*
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* @since 1.1.0
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*
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* @link https://amp.dev/documentation/guides-and-tutorials/optimize-and-measure/optimize_amp/#optimize-the-amp-runtime-loading
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*/
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protected function ensure_boilerplate_is_present(): void {
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$style = null;
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$styles = $this->dom->xpath->query( './style[ @amp-boilerplate ]', $this->dom->head );
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if ( $styles ) {
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$style = $styles->item( 0 );
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}
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if ( ! $style ) {
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$style = $this->dom->createElement( Tag::STYLE );
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if ( $style ) {
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$style->setAttribute( Attribute::AMP_BOILERPLATE, '' );
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$style->appendChild( $this->dom->createTextNode( $this->get_boilerplate_stylesheets()[0] ) );
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}
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} elseif ( $style->parentNode ) {
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$style->parentNode->removeChild( $style ); // So we can move it.
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}
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if ( $style ) {
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$this->dom->head->appendChild( $style );
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}
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$noscript = null;
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$noscripts = $this->dom->xpath->query( './noscript[ style[ @amp-boilerplate ] ]', $this->dom->head );
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if ( $noscripts ) {
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$noscript = $noscripts->item( 0 );
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}
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if ( ! $noscript ) {
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$noscript = $this->dom->createElement( Tag::NOSCRIPT );
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$style = $this->dom->createElement( Tag::STYLE );
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if ( $style && $noscript ) {
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$style->setAttribute( Attribute::AMP_BOILERPLATE, '' );
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$style->appendChild( $this->dom->createTextNode( $this->get_boilerplate_stylesheets()[1] ) );
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$noscript->appendChild( $style );
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}
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} elseif ( $noscript->parentNode ) {
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$noscript->parentNode->removeChild( $noscript ); // So we can move it.
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}
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if ( $noscript ) {
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$this->dom->head->appendChild( $noscript );
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}
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}
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/**
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* Get AMP boilerplate stylesheets.
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*
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* Clone of amp_get_boilerplate_stylesheets().
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*
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* @since 1.1.0
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*
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* @link https://www.ampproject.org/docs/reference/spec#boilerplate
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* @see amp_get_boilerplate_stylesheets()
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*
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* @return string[] Stylesheets, where first is contained in style[amp-boilerplate] and the second in noscript>style[amp-boilerplate].
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*/
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protected function get_boilerplate_stylesheets(): array {
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return [
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'body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}',
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'body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}',
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];
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}
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}
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