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<?php
/**
* AMP Editor Blocks extending.
*
* @package AMP
* @since 1.0
*/
/**
* Class AMP_Editor_Blocks
*
* @internal
*/
class AMP_Editor_Blocks {
/**
* List of AMP scripts that need to be printed when AMP components are used in non-AMP document context ("dirty AMP").
*
* @var array
*/
public $content_required_amp_scripts = [];
/**
* AMP components that have blocks.
*
* @var array
*/
public $amp_blocks = [
'amp-mathml',
'amp-timeago',
'amp-o2-player',
'amp-ooyala-player',
'amp-reach-player',
'amp-springboard-player',
'amp-jwplayer',
'amp-brid-player',
'amp-ima-video',
'amp-fit-text',
];
/**
* Init.
*/
public function init() {
if ( function_exists( 'register_block_type' ) ) {
add_filter( 'wp_kses_allowed_html', [ $this, 'include_block_atts_in_wp_kses_allowed_html' ], 10, 2 );
/*
* Dirty AMP is required when a site is in AMP-first mode but not all templates are being served
* as AMP. In particular, if a single post is using AMP-specific Gutenberg Blocks which make
* use of AMP components, and the singular template is served as AMP but the blog page is not,
* then the non-AMP blog page need to load the AMP runtime scripts so that the AMP components
* in the posts displayed there will be rendered properly. This is only relevant on AMP-first
* sites because the AMP Gutenberg blocks are only made available in that mode; they are not
* presented in the Gutenberg inserter in transitional mode. In general, using AMP components in
* non-AMP documents is still not officially supported, so it's occurrence is being minimized
* as much as possible. For more, see <https://github.com/ampproject/amp-wp/issues/1192>.
*/
if ( amp_is_canonical() ) {
add_filter( 'the_content', [ $this, 'tally_content_requiring_amp_scripts' ] );
add_action( 'wp_print_footer_scripts', [ $this, 'print_dirty_amp_scripts' ] );
}
}
}
/**
* Allowlist elements and attributes used for AMP.
*
* This prevents AMP markup from being deleted in
*
* @param array $tags Array of allowed post tags.
* @param string $context Context.
* @return mixed Modified array.
*/
public function include_block_atts_in_wp_kses_allowed_html( $tags, $context ) {
if ( 'post' !== $context ) {
return $tags;
}
foreach ( $tags as &$tag ) {
if ( ! is_array( $tag ) ) {
continue;
}
$tag['data-amp-layout'] = true;
$tag['data-amp-noloading'] = true;
$tag['data-amp-lightbox'] = true;
$tag['data-close-button-aria-label'] = true;
}
unset( $tag );
foreach ( $this->amp_blocks as $amp_block ) {
if ( ! isset( $tags[ $amp_block ] ) ) {
$tags[ $amp_block ] = [];
}
// @todo The global attributes included here should be matched up with what is actually used by each block.
$tags[ $amp_block ] = array_merge(
array_fill_keys(
[
'layout',
'width',
'height',
'class',
],
true
),
$tags[ $amp_block ]
);
$amp_tag_specs = AMP_Allowed_Tags_Generated::get_allowed_tag( $amp_block );
foreach ( $amp_tag_specs as $amp_tag_spec ) {
if ( ! isset( $amp_tag_spec[ AMP_Rule_Spec::ATTR_SPEC_LIST ] ) ) {
continue;
}
$tags[ $amp_block ] = array_merge(
$tags[ $amp_block ],
array_fill_keys( array_keys( $amp_tag_spec[ AMP_Rule_Spec::ATTR_SPEC_LIST ] ), true )
);
}
}
return $tags;
}
/**
* Tally the AMP component scripts that are needed in a dirty AMP document.
*
* @param string $content Content.
* @return string Content (unmodified).
*/
public function tally_content_requiring_amp_scripts( $content ) {
if ( ! amp_is_request() ) {
$pattern = sprintf( '/<(%s)\b.*?>/s', implode( '|', $this->amp_blocks ) );
if ( preg_match_all( $pattern, $content, $matches ) ) {
$this->content_required_amp_scripts = array_merge(
$this->content_required_amp_scripts,
$matches[1]
);
}
}
return $content;
}
/**
* Print AMP scripts required for AMP components used in a non-AMP document (dirty AMP).
*/
public function print_dirty_amp_scripts() {
if ( ! amp_is_request() && ! empty( $this->content_required_amp_scripts ) ) {
wp_scripts()->do_items( $this->content_required_amp_scripts );
}
}
}
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