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class-amp-theme-support.php
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class-amp-theme-support.php
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<?php
/**
* Class AMP_Theme_Support
*
* @package AMP
*/
/**
* Class AMP_Theme_Support
*
* Callbacks for adding AMP-related things when theme support is added.
*/
class AMP_Theme_Support {
/**
* Replaced with the necessary scripts depending on components used in output.
*
* @var string
*/
const SCRIPTS_PLACEHOLDER = '<!-- AMP:SCRIPTS_PLACEHOLDER -->';
/**
* Response cache group name.
*
* @var string
*/
const RESPONSE_CACHE_GROUP = 'amp-reponse';
/**
* Sanitizer classes.
*
* @var array
*/
protected static $sanitizer_classes = array();
/**
* Embed handlers.
*
* @var AMP_Base_Embed_Handler[]
*/
protected static $embed_handlers = array();
/**
* Template types.
*
* @var array
*/
protected static $template_types = array(
'paged', // Deprecated.
'index',
'404',
'archive',
'author',
'category',
'tag',
'taxonomy',
'date',
'home',
'front_page',
'page',
'search',
'single',
'embed',
'singular',
'attachment',
);
/**
* AMP-specific query vars that were purged.
*
* @since 0.7
* @see AMP_Theme_Support::purge_amp_query_vars()
* @var string[]
*/
public static $purged_amp_query_vars = array();
/**
* Start time when init was called.
*
* @since 1.0
* @var float
*/
public static $init_start_time;
/**
* Whether output buffering has started.
*
* @since 0.7
* @var bool
*/
protected static $is_output_buffering = false;
/**
* Initialize.
*
* @since 0.7
*/
public static function init() {
self::apply_options();
if ( ! current_theme_supports( 'amp' ) ) {
return;
}
AMP_Validation_Manager::init( array(
'should_locate_sources' => AMP_Validation_Manager::should_validate_response(),
) );
self::$init_start_time = microtime( true );
self::purge_amp_query_vars();
self::handle_xhr_request();
require_once AMP__DIR__ . '/includes/amp-post-template-actions.php';
// Validate theme support usage.
$support = get_theme_support( 'amp' );
if ( WP_DEBUG && is_array( $support ) ) {
$args = array_shift( $support );
if ( ! is_array( $args ) ) {
trigger_error( esc_html__( 'Expected AMP theme support arg to be array.', 'amp' ) ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
} elseif ( count( array_diff( array_keys( $args ), array( 'template_dir', 'available_callback', 'comments_live_list', '__added_via_option' ) ) ) !== 0 ) {
trigger_error( esc_html__( 'Expected AMP theme support to only have template_dir and/or available_callback.', 'amp' ) ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error
}
}
add_action( 'widgets_init', array( __CLASS__, 'register_widgets' ) );
/*
* Note that wp action is use instead of template_redirect because some themes/plugins output
* the response at this action and then short-circuit with exit. So this is why the the preceding
* action to template_redirect--the wp action--is used instead.
*/
add_action( 'wp', array( __CLASS__, 'finish_init' ), PHP_INT_MAX );
}
/**
* Apply options for whether theme support is enabled via admin and what sanitization is performed by default.
*
* @see AMP_Post_Type_Support::add_post_type_support() For where post type support is added, since it is irrespective of theme support.
*/
public static function apply_options() {
if ( ! current_theme_supports( 'amp' ) ) {
$theme_support_option = AMP_Options_Manager::get_option( 'theme_support' );
if ( 'disabled' === $theme_support_option ) {
return;
}
$args = array(
'__added_via_option' => true,
);
if ( 'paired' === $theme_support_option ) {
$args['template_dir'] = './';
}
add_theme_support( 'amp', $args );
}
}
/**
* Finish initialization once query vars are set.
*
* @since 0.7
*/
public static function finish_init() {
if ( ! is_amp_endpoint() ) {
amp_add_frontend_actions();
return;
}
self::ensure_proper_amp_location();
if ( ! amp_is_canonical() ) {
self::register_paired_hooks();
}
self::add_hooks();
self::$sanitizer_classes = amp_get_content_sanitizers();
self::$sanitizer_classes = AMP_Validation_Manager::filter_sanitizer_args( self::$sanitizer_classes );
self::$embed_handlers = self::register_content_embed_handlers();
foreach ( self::$sanitizer_classes as $sanitizer_class => $args ) {
if ( method_exists( $sanitizer_class, 'add_buffering_hooks' ) ) {
call_user_func( array( $sanitizer_class, 'add_buffering_hooks' ), $args );
}
}
}
/**
* Ensure that the current AMP location is correct.
*
* @since 1.0
*
* @param bool $exit Whether to exit after redirecting.
* @return bool Whether redirection was done. Naturally this is irrelevant if $exit is true.
*/
public static function ensure_proper_amp_location( $exit = true ) {
$has_query_var = false !== get_query_var( amp_get_slug(), false ); // May come from URL param or endpoint slug.
$has_url_param = isset( $_GET[ amp_get_slug() ] ); // WPCS: CSRF OK.
if ( amp_is_canonical() ) {
/*
* When AMP native/canonical, then when there is an /amp/ endpoint or ?amp URL param,
* then a redirect needs to be done to the URL without any AMP indicator in the URL.
*/
if ( $has_query_var || $has_url_param ) {
return self::redirect_ampless_url( $exit );
}
} else {
/*
* When in AMP paired mode *with* theme support, then the proper AMP URL has the 'amp' URL param
* and not the /amp/ endpoint. The URL param is now the exclusive way to mark AMP in paired mode
* when amp theme support present. This is important for plugins to be able to reliably call
* is_amp_endpoint() before the parse_query action.
*/
if ( $has_query_var && ! $has_url_param ) {
$old_url = amp_get_current_url();
$new_url = add_query_arg( amp_get_slug(), '', amp_remove_endpoint( $old_url ) );
if ( $old_url !== $new_url ) {
wp_safe_redirect( $new_url, 302 );
if ( $exit ) {
exit;
}
return true;
}
}
}
return false;
}
/**
* Redirect to non-AMP version of the current URL, such as because AMP is canonical or there are unaccepted validation errors.
*
* If the current URL is already AMP-less then do nothing.
*
* @since 0.7
* @since 1.0 Added $exit param.
* @since 1.0 Renamed from redirect_canonical_amp().
*
* @param bool $exit Whether to exit after redirecting.
* @return bool Whether redirection was done. Naturally this is irrelevant if $exit is true.
*/
public static function redirect_ampless_url( $exit = true ) {
$current_url = amp_get_current_url();
$ampless_url = amp_remove_endpoint( $current_url );
if ( $ampless_url === $current_url ) {
return false;
}
/*
* Temporary redirect because AMP URL may return when blocking validation errors
* occur or when a non-canonical AMP theme is used.
*/
wp_safe_redirect( $ampless_url, 302 );
if ( $exit ) {
exit;
}
return true;
}
/**
* Determines whether paired mode is available.
*
* When 'amp' theme support has not been added or canonical mode is enabled, then this returns false.
* Returns true when there is a template_dir defined in theme support, and if a defined available_callback
* returns true.
*
* @return bool Whether available.
*/
public static function is_paired_available() {
$support = get_theme_support( 'amp' );
if ( empty( $support ) || amp_is_canonical() ) {
return false;
}
/**
* Queried object.
*
* @var WP_Post $queried_object
*/
$queried_object = get_queried_object();
if ( is_singular() && ! post_supports_amp( $queried_object ) ) {
return false;
}
$args = array_shift( $support );
if ( isset( $args['available_callback'] ) && is_callable( $args['available_callback'] ) ) {
return call_user_func( $args['available_callback'] );
}
return true;
}
/**
* Determine whether the user is in the Customizer preview iframe.
*
* @since 0.7
*
* @return bool Whether in Customizer preview iframe.
*/
public static function is_customize_preview_iframe() {
global $wp_customize;
return is_customize_preview() && $wp_customize->get_messenger_channel();
}
/**
* Register hooks for paired mode.
*/
public static function register_paired_hooks() {
foreach ( self::$template_types as $template_type ) {
add_filter( "{$template_type}_template_hierarchy", array( __CLASS__, 'filter_paired_template_hierarchy' ) );
}
add_filter( 'template_include', array( __CLASS__, 'filter_paired_template_include' ), 100 );
}
/**
* Register hooks.
*/
public static function add_hooks() {
// Remove core actions which are invalid AMP.
remove_action( 'wp_head', 'wp_post_preview_js', 1 );
remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
remove_action( 'wp_print_styles', 'print_emoji_styles' );
remove_action( 'wp_head', 'wp_oembed_add_host_js' );
// Prevent MediaElement.js scripts/styles from being enqueued.
add_filter( 'wp_video_shortcode_library', function() {
return 'amp';
} );
add_filter( 'wp_audio_shortcode_library', function() {
return 'amp';
} );
/*
* Add additional markup required by AMP <https://www.ampproject.org/docs/reference/spec#required-markup>.
* Note that the meta[name=viewport] is not added here because a theme may want to define one with additional
* properties than included in the default configuration. If a theme doesn't include one, then the meta viewport
* will be added when output buffering is finished. Note that meta charset _is_ output here because the output
* buffer will need it to parse the document properly, and it must be exactly as is to be valid AMP. Nevertheless,
* in this case too we should defer to the theme as well to output the meta charset because it is possible the
* install is not on utf-8 and we may need to do a encoding conversion.
*/
add_action( 'wp_print_styles', array( __CLASS__, 'print_amp_styles' ), 0 ); // Print boilerplate before theme and plugin stylesheets.
add_action( 'wp_head', 'amp_add_generator_metadata', 20 );
add_action( 'wp_enqueue_scripts', array( __CLASS__, 'enqueue_assets' ) );
add_action( 'wp_enqueue_scripts', array( __CLASS__, 'dequeue_customize_preview_scripts' ), 1000 );
add_filter( 'customize_partial_render', array( __CLASS__, 'filter_customize_partial_render' ) );
add_action( 'wp_footer', 'amp_print_analytics' );
/*
* Disable admin bar because admin-bar.css (28K) and Dashicons (48K) alone
* combine to surpass the 50K limit imposed for the amp-custom style.
*/
add_filter( 'show_admin_bar', '__return_false', 100 );
/*
* Start output buffering at very low priority for sake of plugins and themes that use template_redirect
* instead of template_include.
*/
$priority = defined( 'PHP_INT_MIN' ) ? PHP_INT_MIN : ~PHP_INT_MAX; // phpcs:ignore PHPCompatibility.PHP.NewConstants.php_int_minFound
add_action( 'template_redirect', array( __CLASS__, 'start_output_buffering' ), $priority );
// Commenting hooks.
add_filter( 'wp_list_comments_args', array( __CLASS__, 'set_comments_walker' ), PHP_INT_MAX );
add_filter( 'comment_form_defaults', array( __CLASS__, 'filter_comment_form_defaults' ) );
add_filter( 'comment_reply_link', array( __CLASS__, 'filter_comment_reply_link' ), 10, 4 );
add_filter( 'cancel_comment_reply_link', array( __CLASS__, 'filter_cancel_comment_reply_link' ), 10, 3 );
add_action( 'comment_form', array( __CLASS__, 'amend_comment_form' ), 100 );
remove_action( 'comment_form', 'wp_comment_form_unfiltered_html_nonce' );
add_filter( 'wp_kses_allowed_html', array( __CLASS__, 'whitelist_layout_in_wp_kses_allowed_html' ), 10 );
add_filter( 'get_header_image_tag', array( __CLASS__, 'amend_header_image_with_video_header' ), PHP_INT_MAX );
add_action( 'wp_print_footer_scripts', function() {
wp_dequeue_script( 'wp-custom-header' );
}, 0 );
add_action( 'wp_enqueue_scripts', function() {
wp_dequeue_script( 'comment-reply' ); // Handled largely by AMP_Comments_Sanitizer and *reply* methods in this class.
} );
// @todo Add character conversion.
}
/**
* Remove query vars that come in requests such as for amp-live-list.
*
* WordPress should generally not respond differently to requests when these parameters
* are present. In some cases, when a query param such as __amp_source_origin is present
* then it would normally get included into pagination links generated by get_pagenum_link().
* The whitelist sanitizer empties out links that contain this string as it matches the
* blacklisted_value_regex. So by preemptively scrubbing any reference to these query vars
* we can ensure that WordPress won't end up referencing them in any way.
*
* @since 0.7
*/
public static function purge_amp_query_vars() {
$query_vars = array(
'__amp_source_origin',
'_wp_amp_action_xhr_converted',
'amp_latest_update_time',
'amp_last_check_time',
);
// Scrub input vars.
foreach ( $query_vars as $query_var ) {
if ( ! isset( $_GET[ $query_var ] ) ) { // phpcs:ignore
continue;
}
self::$purged_amp_query_vars[ $query_var ] = wp_unslash( $_GET[ $query_var ] ); // phpcs:ignore
unset( $_REQUEST[ $query_var ], $_GET[ $query_var ] );
$scrubbed = true;
}
if ( isset( $scrubbed ) ) {
$build_query = function( $query ) use ( $query_vars ) {
$pattern = '/^(' . join( '|', $query_vars ) . ')(?==|$)/';
$pairs = array();
foreach ( explode( '&', $query ) as $pair ) {
if ( ! preg_match( $pattern, $pair ) ) {
$pairs[] = $pair;
}
}
return join( '&', $pairs );
};
// Scrub QUERY_STRING.
if ( ! empty( $_SERVER['QUERY_STRING'] ) ) {
$_SERVER['QUERY_STRING'] = $build_query( $_SERVER['QUERY_STRING'] );
}
// Scrub REQUEST_URI.
if ( ! empty( $_SERVER['REQUEST_URI'] ) ) {
list( $path, $query ) = explode( '?', $_SERVER['REQUEST_URI'], 2 );
$pairs = $build_query( $query );
$_SERVER['REQUEST_URI'] = $path;
if ( ! empty( $pairs ) ) {
$_SERVER['REQUEST_URI'] .= "?{$pairs}";
}
}
}
}
/**
* Hook into a POST form submissions, such as the comment form or some other form submission.
*
* @since 0.7.0
*/
public static function handle_xhr_request() {
$is_amp_xhr = (
! empty( self::$purged_amp_query_vars['_wp_amp_action_xhr_converted'] )
&&
! empty( self::$purged_amp_query_vars['__amp_source_origin'] )
&&
( ! empty( $_SERVER['REQUEST_METHOD'] ) && 'POST' === $_SERVER['REQUEST_METHOD'] )
);
if ( ! $is_amp_xhr ) {
return;
}
// Send AMP response header.
$origin = wp_validate_redirect( wp_sanitize_redirect( esc_url_raw( self::$purged_amp_query_vars['__amp_source_origin'] ) ) );
if ( $origin ) {
AMP_Response_Headers::send_header( 'AMP-Access-Control-Allow-Source-Origin', $origin, array( 'replace' => true ) );
}
// Intercept POST requests which redirect.
add_filter( 'wp_redirect', array( __CLASS__, 'intercept_post_request_redirect' ), PHP_INT_MAX );
// Add special handling for redirecting after comment submission.
add_filter( 'comment_post_redirect', array( __CLASS__, 'filter_comment_post_redirect' ), PHP_INT_MAX, 2 );
// Add die handler for AMP error display, most likely due to problem with comment.
add_filter( 'wp_die_handler', function() {
return array( __CLASS__, 'handle_wp_die' );
} );
}
/**
* Strip tags that are not allowed in amp-mustache.
*
* @since 0.7.0
*
* @param string $text Text to sanitize.
* @return string Sanitized text.
*/
protected static function wp_kses_amp_mustache( $text ) {
$amp_mustache_allowed_html_tags = array( 'strong', 'b', 'em', 'i', 'u', 's', 'small', 'mark', 'del', 'ins', 'sup', 'sub' );
return wp_kses( $text, array_fill_keys( $amp_mustache_allowed_html_tags, array() ) );
}
/**
* Handle comment_post_redirect to ensure page reload is done when comments_live_list is not supported, while sending back a success message when it is.
*
* @since 0.7.0
*
* @param string $url Comment permalink to redirect to.
* @param WP_Comment $comment Posted comment.
* @return string|null URL if redirect to be done; otherwise function will exist.
*/
public static function filter_comment_post_redirect( $url, $comment ) {
$theme_support = get_theme_support( 'amp' );
// Cause a page refresh if amp-live-list is not implemented for comments via add_theme_support( 'amp', array( 'comments_live_list' => true ) ).
if ( empty( $theme_support[0]['comments_live_list'] ) ) {
/*
* Add the comment ID to the URL to force AMP to refresh the page.
* This is ideally a temporary workaround to deal with https://github.com/ampproject/amphtml/issues/14170
*/
$url = add_query_arg( 'comment', $comment->comment_ID, $url );
// Pass URL along to wp_redirect().
return $url;
}
// Create a success message to display to the user.
if ( '1' === (string) $comment->comment_approved ) {
$message = __( 'Your comment has been posted.', 'amp' );
} else {
$message = __( 'Your comment is awaiting moderation.', 'default' ); // Note core string re-use.
}
/**
* Filters the message when comment submitted success message when
*
* @since 0.7
*/
$message = apply_filters( 'amp_comment_posted_message', $message, $comment );
// Message will be shown in template defined by AMP_Theme_Support::amend_comment_form().
wp_send_json( array(
'message' => self::wp_kses_amp_mustache( $message ),
) );
return null;
}
/**
* New error handler for AMP form submission.
*
* @since 0.7.0
* @see wp_die()
*
* @param WP_Error|string $error The error to handle.
* @param string|int $title Optional. Error title. If `$message` is a `WP_Error` object,
* error data with the key 'title' may be used to specify the title.
* If `$title` is an integer, then it is treated as the response
* code. Default empty.
* @param string|array|int $args {
* Optional. Arguments to control behavior. If `$args` is an integer, then it is treated
* as the response code. Default empty array.
*
* @type int $response The HTTP response code. Default 200 for Ajax requests, 500 otherwise.
* }
*/
public static function handle_wp_die( $error, $title = '', $args = array() ) {
if ( is_int( $title ) ) {
$status_code = $title;
} elseif ( is_int( $args ) ) {
$status_code = $args;
} elseif ( is_array( $args ) && isset( $args['response'] ) ) {
$status_code = $args['response'];
} else {
$status_code = 500;
}
status_header( $status_code );
if ( is_wp_error( $error ) ) {
$error = $error->get_error_message();
}
// Message will be shown in template defined by AMP_Theme_Support::amend_comment_form().
wp_send_json( array(
'error' => self::wp_kses_amp_mustache( $error ),
) );
}
/**
* Intercept the response to a POST request.
*
* @since 0.7.0
* @see wp_redirect()
*
* @param string $location The location to redirect to.
*/
public static function intercept_post_request_redirect( $location ) {
// Make sure relative redirects get made absolute.
$parsed_location = array_merge(
array(
'scheme' => 'https',
'host' => wp_parse_url( home_url(), PHP_URL_HOST ),
'path' => isset( $_SERVER['REQUEST_URI'] ) ? strtok( wp_unslash( $_SERVER['REQUEST_URI'] ), '?' ) : '/',
),
wp_parse_url( $location )
);
$absolute_location = '';
if ( 'https' === $parsed_location['scheme'] ) {
$absolute_location .= $parsed_location['scheme'] . ':';
}
$absolute_location .= '//' . $parsed_location['host'];
if ( isset( $parsed_location['port'] ) ) {
$absolute_location .= ':' . $parsed_location['port'];
}
$absolute_location .= $parsed_location['path'];
if ( isset( $parsed_location['query'] ) ) {
$absolute_location .= '?' . $parsed_location['query'];
}
if ( isset( $parsed_location['fragment'] ) ) {
$absolute_location .= '#' . $parsed_location['fragment'];
}
AMP_Response_Headers::send_header( 'AMP-Redirect-To', $absolute_location );
AMP_Response_Headers::send_header( 'Access-Control-Expose-Headers', 'AMP-Redirect-To' );
wp_send_json_success();
}
/**
* Register/override widgets.
*
* @global WP_Widget_Factory
* @return void
*/
public static function register_widgets() {
global $wp_widget_factory;
foreach ( $wp_widget_factory->widgets as $registered_widget ) {
$registered_widget_class_name = get_class( $registered_widget );
if ( ! preg_match( '/^WP_Widget_(.+)$/', $registered_widget_class_name, $matches ) ) {
continue;
}
$amp_class_name = 'AMP_Widget_' . $matches[1];
if ( ! class_exists( $amp_class_name ) || is_a( $amp_class_name, $registered_widget_class_name ) ) {
continue;
}
unregister_widget( $registered_widget_class_name );
register_widget( $amp_class_name );
}
}
/**
* Register content embed handlers.
*
* This was copied from `AMP_Content::register_embed_handlers()` due to being a private method
* and due to `AMP_Content` not being well suited for use in AMP canonical.
*
* @see AMP_Content::register_embed_handlers()
* @global int $content_width
* @return AMP_Base_Embed_Handler[] Handlers.
*/
public static function register_content_embed_handlers() {
global $content_width;
$embed_handlers = array();
foreach ( amp_get_content_embed_handlers() as $embed_handler_class => $args ) {
/**
* Embed handler.
*
* @type AMP_Base_Embed_Handler $embed_handler
*/
$embed_handler = new $embed_handler_class( array_merge(
array(
'content_max_width' => ! empty( $content_width ) ? $content_width : AMP_Post_Template::CONTENT_MAX_WIDTH, // Back-compat.
),
$args
) );
if ( ! is_subclass_of( $embed_handler, 'AMP_Base_Embed_Handler' ) ) {
/* translators: %s is embed handler */
_doing_it_wrong( __METHOD__, esc_html( sprintf( __( 'Embed Handler (%s) must extend `AMP_Embed_Handler`', 'amp' ), $embed_handler_class ) ), '0.1' );
continue;
}
$embed_handler->register_embed();
$embed_handlers[] = $embed_handler;
}
return $embed_handlers;
}
/**
* Add the comments template placeholder marker
*
* @param array $args the args for the comments list..
* @return array Args to return.
*/
public static function set_comments_walker( $args ) {
$amp_walker = new AMP_Comment_Walker();
$args['walker'] = $amp_walker;
return $args;
}
/**
* Adds the form submit success and fail templates.
*/
public static function amend_comment_form() {
?>
<?php if ( is_singular() && ! amp_is_canonical() ) : ?>
<input type="hidden" name="redirect_to" value="<?php echo esc_url( amp_get_permalink( get_the_ID() ) ); ?>">
<?php endif; ?>
<div submit-success>
<template type="amp-mustache">
<p>{{{message}}}</p>
</template>
</div>
<div submit-error>
<template type="amp-mustache">
<p class="amp-comment-submit-error">{{{error}}}</p>
</template>
</div>
<?php
}
/**
* Prepends template hierarchy with template_dir for AMP paired mode templates.
*
* @see get_query_template()
*
* @param array $templates Template hierarchy.
* @return array Templates.
*/
public static function filter_paired_template_hierarchy( $templates ) {
$support = get_theme_support( 'amp' );
$args = array_shift( $support );
if ( isset( $args['template_dir'] ) ) {
$amp_templates = array();
foreach ( $templates as $template ) {
$amp_templates[] = $args['template_dir'] . '/' . $template;
}
$templates = $amp_templates;
}
return $templates;
}
/**
* Redirect to the non-canonical URL when the template to include is empty.
*
* This is a failsafe in case an index.php is not located in the AMP template_dir,
* and the available_callback fails to omit a given request from being available in AMP.
*
* @param string $template Template to include.
* @return string Template to include.
*/
public static function filter_paired_template_include( $template ) {
if ( empty( $template ) || ! self::is_paired_available() ) {
wp_safe_redirect( self::get_current_canonical_url(), 302 ); // Temporary redirect because support may come later.
exit;
}
return $template;
}
/**
* Get canonical URL for current request.
*
* @see rel_canonical()
* @global WP $wp
* @global WP_Rewrite $wp_rewrite
* @link https://www.ampproject.org/docs/reference/spec#canon.
* @link https://core.trac.wordpress.org/ticket/18660
*
* @return string Canonical non-AMP URL.
*/
public static function get_current_canonical_url() {
global $wp, $wp_rewrite;
$url = null;
if ( is_singular() ) {
$url = wp_get_canonical_url();
}
// For non-singular queries, make use of the request URI and public query vars to determine canonical URL.
if ( empty( $url ) ) {
$added_query_vars = $wp->query_vars;
if ( ! $wp_rewrite->permalink_structure || empty( $wp->request ) ) {
$url = home_url( '/' );
} else {
$url = home_url( user_trailingslashit( $wp->request ) );
parse_str( $wp->matched_query, $matched_query_vars );
foreach ( $wp->query_vars as $key => $value ) {
// Remove query vars that were matched in the rewrite rules for the request.
if ( isset( $matched_query_vars[ $key ] ) ) {
unset( $added_query_vars[ $key ] );
}
}
}
}
if ( ! empty( $added_query_vars ) ) {
$url = add_query_arg( $added_query_vars, $url );
}
return amp_remove_endpoint( $url );
}
/**
* Get the ID for the amp-state.
*
* @since 0.7
*
* @param int $post_id Post ID.
* @return string ID for amp-state.
*/
public static function get_comment_form_state_id( $post_id ) {
return sprintf( 'commentform_post_%d', $post_id );
}
/**
* Filter comment form args to an element with [text] AMP binding wrap the title reply.
*
* @since 0.7
* @see comment_form()
*
* @param array $args Comment form args.
* @return array Filtered comment form args.
*/
public static function filter_comment_form_defaults( $args ) {
$state_id = self::get_comment_form_state_id( get_the_ID() );
$text_binding = sprintf(
'%s.replyToName ? %s : %s',
$state_id,
str_replace(
'%s',
sprintf( '" + %s.replyToName + "', $state_id ),
wp_json_encode( $args['title_reply_to'] )
),
wp_json_encode( $args['title_reply'] )
);
$args['title_reply_before'] .= sprintf(
'<span [text]="%s">',
esc_attr( $text_binding )
);
$args['cancel_reply_before'] = '</span>' . $args['cancel_reply_before'];
return $args;
}
/**
* Modify the comment reply link for AMP.
*
* @since 0.7
* @see get_comment_reply_link()
*
* @param string $link The HTML markup for the comment reply link.
* @param array $args An array of arguments overriding the defaults.
* @param WP_Comment $comment The object of the comment being replied.
* @return string Comment reply link.
*/
public static function filter_comment_reply_link( $link, $args, $comment ) {
// Continue to show default link to wp-login when user is not logged-in.
if ( get_option( 'comment_registration' ) && ! is_user_logged_in() ) {
return $args['before'] . $link . $args['after'];
}
$state_id = self::get_comment_form_state_id( get_the_ID() );
$tap_state = array(
$state_id => array(
'replyToName' => $comment->comment_author,
'values' => array(
'comment_parent' => (string) $comment->comment_ID,
),
),
);
// @todo Figure out how to support add_below. Instead of moving the form, what about letting the form get a fixed position?
$link = sprintf(
'<a rel="nofollow" class="comment-reply-link" href="%s" on="%s" aria-label="%s">%s</a>',
esc_attr( '#' . $args['respond_id'] ),
esc_attr( sprintf( 'tap:AMP.setState( %s )', wp_json_encode( $tap_state ) ) ),
esc_attr( sprintf( $args['reply_to_text'], $comment->comment_author ) ),
$args['reply_text']
);
return $args['before'] . $link . $args['after'];
}
/**
* Filters the cancel comment reply link HTML.
*
* @since 0.7
* @see get_cancel_comment_reply_link()
*
* @param string $formatted_link The HTML-formatted cancel comment reply link.
* @param string $link Cancel comment reply link URL.
* @param string $text Cancel comment reply link text.
* @return string Cancel reply link.
*/
public static function filter_cancel_comment_reply_link( $formatted_link, $link, $text ) {
unset( $formatted_link, $link );
if ( empty( $text ) ) {
$text = __( 'Click here to cancel reply.', 'default' );
}
$state_id = self::get_comment_form_state_id( get_the_ID() );
$tap_state = array(
$state_id => array(
'replyToName' => '',
'values' => array(
'comment_parent' => '0',
),
),
);
$respond_id = 'respond'; // Hard-coded in comment_form() and default value in get_comment_reply_link().
return sprintf(
'<a id="cancel-comment-reply-link" href="%s" %s [hidden]="%s" on="%s">%s</a>',
esc_url( remove_query_arg( 'replytocom' ) . '#' . $respond_id ),
isset( $_GET['replytocom'] ) ? '' : ' hidden', // phpcs:ignore
esc_attr( sprintf( '%s.values.comment_parent == "0"', self::get_comment_form_state_id( get_the_ID() ) ) ),
esc_attr( sprintf( 'tap:AMP.setState( %s )', wp_json_encode( $tap_state ) ) ),
esc_html( $text )
);
}
/**
* Print AMP boilerplate and custom styles.
*/
public static function print_amp_styles() {
echo amp_get_boilerplate_code() . "\n"; // WPCS: XSS OK.
echo "<style amp-custom></style>\n"; // This will by populated by AMP_Style_Sanitizer.
}
/**
* Ensure markup required by AMP <https://www.ampproject.org/docs/reference/spec#required-markup>.
*
* Ensure meta[charset], meta[name=viewport], and link[rel=canonical]; a the whitelist sanitizer
* may have removed an illegal meta[http-equiv] or meta[name=viewport]. Core only outputs a
* canonical URL by default if a singular post.
*
* @since 0.7
* @todo All of this might be better placed inside of a sanitizer.
*
* @param DOMDocument $dom Doc.
*/
public static function ensure_required_markup( DOMDocument $dom ) {
/**
* Elements.
*
* @var DOMElement $meta
* @var DOMElement $script
* @var DOMElement $link
*/
$head = $dom->getElementsByTagName( 'head' )->item( 0 );
if ( ! $head ) {
$head = $dom->createElement( 'head' );
$dom->documentElement->insertBefore( $head, $dom->documentElement->firstChild );
}
$meta_charset = null;
$meta_viewport = null;
foreach ( $head->getElementsByTagName( 'meta' ) as $meta ) {
if ( $meta->hasAttribute( 'charset' ) && 'utf-8' === strtolower( $meta->getAttribute( 'charset' ) ) ) { // @todo Also look for meta[http-equiv="Content-Type"]?
$meta_charset = $meta;
} elseif ( 'viewport' === $meta->getAttribute( 'name' ) ) {
$meta_viewport = $meta;
}
}
if ( ! $meta_charset ) {
// Warning: This probably means the character encoding needs to be converted.
$meta_charset = AMP_DOM_Utils::create_node( $dom, 'meta', array(
'charset' => 'utf-8',
) );
$head->insertBefore( $meta_charset, $head->firstChild );
}
if ( ! $meta_viewport ) {
$meta_viewport = AMP_DOM_Utils::create_node( $dom, 'meta', array(
'name' => 'viewport',
'content' => 'width=device-width,minimum-scale=1',
) );
$head->insertBefore( $meta_viewport, $meta_charset->nextSibling );
}
// Prevent schema.org duplicates.
$has_schema_org_metadata = false;
foreach ( $head->getElementsByTagName( 'script' ) as $script ) {
if ( 'application/ld+json' === $script->getAttribute( 'type' ) && false !== strpos( $script->nodeValue, 'schema.org' ) ) {
$has_schema_org_metadata = true;
break;
}
}
if ( ! $has_schema_org_metadata ) {
$script = $dom->createElement( 'script', wp_json_encode( amp_get_schemaorg_metadata() ) );
$script->setAttribute( 'type', 'application/ld+json' );
$head->appendChild( $script );
}
// Ensure rel=canonical link.
$rel_canonical = null;
foreach ( $head->getElementsByTagName( 'link' ) as $link ) {
if ( 'canonical' === $link->getAttribute( 'rel' ) ) {
$rel_canonical = $link;
break;
}
}
if ( ! $rel_canonical ) {
$rel_canonical = AMP_DOM_Utils::create_node( $dom, 'link', array(
'rel' => 'canonical',
'href' => self::get_current_canonical_url(),
) );