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<?php
/**
* Class Sandboxing.
*
* @package AmpProject\AmpWP
*/
namespace AmpProject\AmpWP;
use AMP_Comments_Sanitizer;
use AMP_Form_Sanitizer;
use AMP_Options_Manager;
use AMP_Script_Sanitizer;
use AMP_Style_Sanitizer;
use AmpProject\AmpWP\Infrastructure\Registerable;
use AmpProject\AmpWP\Infrastructure\Service;
use AmpProject\AmpWP\Option;
use AmpProject\Dom\Document;
use AmpProject\Dom\Element;
use AmpProject\Html\Attribute;
use AmpProject\Html\Tag;
use DOMAttr;
/**
* Experimental service to facilitate flexible AMP.
*
* @package AmpProject\AmpWP
* @since 2.2
* @internal
*/
final class Sandboxing implements Service, Registerable {
/**
* Option key for enabling sandboxing.
*
* @deprecated Use Options interface for option keys.
*
* @var string
*/
const OPTION_ENABLED = 'sandboxing_enabled';
/**
* Option key for sandboxing level.
*
* @deprecated Use Options interface for option keys.
*
* @var string
*/
const OPTION_LEVEL = 'sandboxing_level';
/**
* Sandboxing levels.
*
* @var int[]
*/
const LEVELS = [ 1, 2, 3 ];
/**
* Default sandboxing options schema.
*
* @var array
*/
const DEFAULT_OPTIONS_SCHEMA = [
Option::SANDBOXING_ENABLED => [
'type' => 'bool',
'default' => false,
],
Option::SANDBOXING_LEVEL => [
'type' => 'int',
'enum' => self::LEVELS,
'default' => 1,
],
];
/**
* Register.
*/
public function register() {
add_filter( 'amp_rest_options_schema', [ $this, 'filter_rest_options_schema' ] );
add_filter( 'amp_default_options', [ $this, 'filter_default_options' ], 10, 2 );
add_filter( 'amp_options_updating', [ $this, 'sanitize_options' ], 10, 2 );
add_action( 'init', [ $this, 'add_hooks' ] );
}
/**
* Filter the REST options schema to add items.
*
* @param array $schema Schema.
* @return array Schema.
*/
public function filter_rest_options_schema( $schema ) {
return array_merge(
$schema,
self::DEFAULT_OPTIONS_SCHEMA
);
}
/**
* Add default options.
*
* @param array $defaults Default options.
* @return array Defaults.
*/
public function filter_default_options( $defaults ) {
foreach ( self::DEFAULT_OPTIONS_SCHEMA as $option_name => $option_schema ) {
$defaults[ $option_name ] = $option_schema['default'];
}
return $defaults;
}
/**
* Sanitize options.
*
* @param array $options Existing options with already-sanitized values for updating.
* @param array $new_options Unsanitized options being submitted for updating.
* @return array Sanitized options.
*/
public function sanitize_options( $options, $new_options ) {
if ( isset( $new_options[ Option::SANDBOXING_ENABLED ] ) ) {
$options[ Option::SANDBOXING_ENABLED ] = (bool) $new_options[ Option::SANDBOXING_ENABLED ];
}
if (
isset( $new_options[ Option::SANDBOXING_LEVEL ] )
&&
in_array( $new_options[ Option::SANDBOXING_LEVEL ], self::LEVELS, true )
) {
$options[ Option::SANDBOXING_LEVEL ] = $new_options[ Option::SANDBOXING_LEVEL ];
}
return $options;
}
/**
* Add hooks.
*/
public function add_hooks() {
$sandboxing_level = amp_get_sandboxing_level();
if ( 0 === $sandboxing_level ) {
return;
}
// Opt-in to the new script sanitization logic in the script sanitizer.
add_filter(
'amp_content_sanitizers',
static function ( $sanitizers ) use ( $sandboxing_level ) {
$sanitizers[ AMP_Script_Sanitizer::class ]['sanitize_js_scripts'] = true;
if ( $sandboxing_level < 3 ) { // <3 === ❤️
$sanitizers[ AMP_Script_Sanitizer::class ]['comment_reply_allowed'] = 'conditionally';
$sanitizers[ AMP_Form_Sanitizer::class ]['native_post_forms_allowed'] = 'conditionally';
$sanitizers[ AMP_Comments_Sanitizer::class ]['ampify_comment_threading'] = 'conditionally';
$sanitizers[ AMP_Style_Sanitizer::class ]['allow_excessive_css'] = true;
}
return $sanitizers;
}
);
if ( 1 === $sandboxing_level ) {
// Keep all invalid AMP markup by default.
add_filter( 'amp_validation_error_default_sanitized', '__return_false' );
}
// To facilitate testing, vary the errors by the sandboxing level.
add_filter(
'amp_validation_error',
static function ( $error ) use ( $sandboxing_level ) {
$error['sandboxing_level'] = $sandboxing_level;
return $error;
}
);
add_action( 'amp_finalize_dom', [ $this, 'finalize_document' ], 10, 2 );
}
/**
* Get the effective sandboxing level.
*
* Even though a site may be configured with a given sandboxing level (e.g. level 1) to allow custom scripts, if no such
* markup is on the page to necessitate the loose level, then the effective level will be actually higher.
*
* @param Document $dom Document.
* @return int Effective sandboxing level.
*/
public static function get_effective_level( Document $dom ) {
if ( ValidationExemption::is_document_with_amp_unvalidated_nodes( $dom ) ) {
return 1;
} elseif ( ValidationExemption::is_document_with_px_verified_nodes( $dom ) ) {
return 2;
} else {
return 3;
}
}
/**
* Remove required AMP markup if not used.
*
* @param Document $dom Document.
* @param int $effective_sandboxing_level Effective sandboxing level.
*/
private function remove_required_amp_markup_if_not_used( Document $dom, $effective_sandboxing_level ) {
if ( 3 === $effective_sandboxing_level ) {
// When valid AMP is the target, don't remove the scripts since it won't be valid AMP.
return;
}
if ( $dom->ampElements->length > 0 ) {
return;
}
$amp_scripts = $dom->xpath->query( '//script[ @custom-element or @custom-template ]' );
if ( $amp_scripts->length > 0 ) {
return;
}
// Remove runtime script(s).
$runtime_scripts = $dom->xpath->query( '//script[ @async and @src and starts-with( @src, "https://cdn.ampproject.org/" ) and contains( @src, "v0" ) ]' );
foreach ( $runtime_scripts as $runtime_script ) {
if ( $runtime_script instanceof Element ) {
$runtime_script->parentNode->removeChild( $runtime_script );
}
}
// Remove runtime style.
$runtime_style = $dom->xpath->query( './style[ @amp-runtime ]', $dom->head )->item( 0 );
if ( $runtime_style instanceof Element ) {
$dom->head->removeChild( $runtime_style );
}
// Remove preconnect link.
$preconnect_link = $dom->xpath->query( './link[ @href = "https://cdn.ampproject.org" ]', $dom->head )->item( 0 );
if ( $preconnect_link instanceof Element ) {
$dom->head->removeChild( $preconnect_link );
}
}
/**
* Finalize document.
*
* @param Document $dom Document.
* @param int $effective_sandboxing_level Effective sandboxing level.
*/
public function finalize_document( Document $dom, $effective_sandboxing_level ) {
$actual_sandboxing_level = AMP_Options_Manager::get_option( Option::SANDBOXING_LEVEL );
$meta_generator = $dom->xpath->query( '/html/head/meta[ @name = "generator" and starts-with( @content, "AMP Plugin" ) ]/@content' )->item( 0 );
if ( $meta_generator instanceof DOMAttr ) {
$meta_generator->nodeValue .= "; sandboxing-level={$actual_sandboxing_level}:{$effective_sandboxing_level}";
}
$this->remove_required_amp_markup_if_not_used( $dom, $effective_sandboxing_level );
$amp_admin_bar_menu_item = $dom->xpath->query( '//div[ @id = "wpadminbar" ]//li[ @id = "wp-admin-bar-amp" ]' )->item( 0 );
if ( $amp_admin_bar_menu_item instanceof Element ) {
switch ( $effective_sandboxing_level ) {
case 1:
$text = '1️⃣';
$title = __( 'Sandboxing level: Loose (1)', 'amp' );
break;
case 2:
$text = '2️⃣';
$title = __( 'Sandboxing level: Moderate (2)', 'amp' );
break;
default:
$text = '3️⃣';
$title = __( 'Sandboxing level: Strict (3)', 'amp' );
break;
}
$amp_link = $dom->xpath->query( './a', $amp_admin_bar_menu_item )->item( 0 );
if ( $amp_link instanceof Element ) {
$span = $dom->createElement( Tag::SPAN );
$span->setAttribute( Attribute::TITLE, $title );
$span->textContent = $text;
$amp_link->appendChild( $dom->createTextNode( ' ' ) );
$amp_link->appendChild( $span );
}
$amp_submenu_ul = $dom->xpath->query( './div/ul[ @id = "wp-admin-bar-amp-default" ]', $amp_admin_bar_menu_item )->item( 0 );
if ( $amp_submenu_ul instanceof Element ) {
$level_li = $dom->createElement( Tag::LI );
$level_li->setAttribute( Attribute::ID, 'wp-admin-bar-amp-sandboxing-level' );
$link = $dom->createElement( Tag::A );
$link->setAttribute( Attribute::CLASS_, 'ab-item' );
$link->textContent = $title;
if ( current_user_can( 'manage_options' ) ) {
$link->setAttribute(
Attribute::HREF,
add_query_arg( 'page', AMP_Options_Manager::OPTION_NAME, admin_url( 'admin.php' ) ) . '#sandboxing'
);
}
$level_li->appendChild( $link );
$amp_submenu_ul->appendChild( $level_li );
}
}
}
}
