amp.php

<?php
/**
 * Plugin Name: AMP
 * Description: An easier path to great Page Experience for everyone. Powered by AMP. <em class="amp-deletion-notice"><strong>Uninstall Note:</strong> To control whether all data from this plugin is deleted at uninstallation, first activate the plugin, go to the Other section on the Settings screen, and set the “Delete plugin data at uninstall” toggle.</em>
 * Plugin URI: https://amp-wp.org
 * Author: AMP Project Contributors
 * Author URI: https://github.com/ampproject/amp-wp/graphs/contributors
 * Version: 2.5.6-alpha
 * License: GPLv2 or later
 * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * Requires at least: 6.6
 * Requires PHP: 7.4
 * Text Domain: amp
 *
 * @package AMP
 */

define( 'AMP__FILE__', __FILE__ );
define( 'AMP__DIR__', dirname( __FILE__ ) );
define( 'AMP__VERSION', '2.5.6-alpha' );

/**
 * Errors encountered while loading the plugin.
 *
 * This has to be a global for the sake of PHP 5.2.
 *
 * @var WP_Error $_amp_load_errors
 */
global $_amp_load_errors;

$_amp_load_errors = new WP_Error();

if ( version_compare( phpversion(), '7.4', '<' ) ) {
	$_amp_load_errors->add(
		'insufficient_php_version',
		sprintf(
			/* translators: %s: required PHP version */
			__( 'The AMP plugin requires PHP %s. Please contact your host to update your PHP version.', 'amp' ),
			'7.4+'
		)
	);
}

// See composer.json for this list.
$_amp_required_extensions = array(
	// Required by FasterImage.
	'curl'   => array(
		'functions' => array(
			'curl_close',
			'curl_errno',
			'curl_error',
			'curl_exec',
			'curl_getinfo',
			'curl_init',
			'curl_setopt',
		),
	),
	'dom'    => array(
		'classes' => array(
			'DOMAttr',
			'DOMComment',
			'DOMDocument',
			'DOMElement',
			'DOMNode',
			'DOMNodeList',
			'DOMXPath',
		),
	),
	'filter' => array(
		'functions' => array(
			'filter_var',
		),
	),
	// Required by PHP-CSS-Parser.
	'iconv'  => array(
		'functions' => array( 'iconv' ),
	),
	'libxml' => array(
		'functions' => array( 'libxml_use_internal_errors' ),
	),
	'spl'    => array(
		'functions' => array( 'spl_autoload_register' ),
	),
);
$_amp_missing_extensions = array();
$_amp_missing_classes    = array();
$_amp_missing_functions  = array();
foreach ( $_amp_required_extensions as $_amp_required_extension => $_amp_required_constructs ) {
	if ( ! extension_loaded( $_amp_required_extension ) ) {
		$_amp_missing_extensions[] = "<code>$_amp_required_extension</code>";
	} else {
		foreach ( $_amp_required_constructs as $_amp_construct_type => $_amp_constructs ) {
			switch ( $_amp_construct_type ) {
				case 'functions':
					foreach ( $_amp_constructs as $_amp_construct ) {
						if ( ! function_exists( $_amp_construct ) ) {
							$_amp_missing_functions[] = "<code>$_amp_construct</code>";
						}
					}
					break;
				case 'classes':
					foreach ( $_amp_constructs as $_amp_construct ) {
						if ( ! class_exists( $_amp_construct ) ) {
							$_amp_missing_classes[] = "<code>$_amp_construct</code>";
						}
					}
					break;
			}
		}
		unset( $_amp_construct_type, $_amp_constructs );
	}
}
if ( count( $_amp_missing_extensions ) > 0 ) {
	$_amp_load_errors->add(
		'missing_extension',
		sprintf(
			/* translators: %s is list of missing extensions */
			_n(
				'The following PHP extension is missing: %s. Please contact your host to finish installation.',
				'The following PHP extensions are missing: %s. Please contact your host to finish installation.',
				count( $_amp_missing_extensions ),
				'amp'
			),
			implode( ', ', $_amp_missing_extensions )
		)
	);
}
if ( count( $_amp_missing_classes ) > 0 ) {
	$_amp_load_errors->add(
		'missing_class',
		sprintf(
			/* translators: %s is list of missing extensions */
			_n(
				'The following PHP class is missing: %s. Please contact your host to finish installation.',
				'The following PHP classes are missing: %s. Please contact your host to finish installation.',
				count( $_amp_missing_classes ),
				'amp'
			),
			implode( ', ', $_amp_missing_classes )
		)
	);
}
if ( count( $_amp_missing_functions ) > 0 ) {
	$_amp_load_errors->add(
		'missing_class',
		sprintf(
			/* translators: %s is list of missing extensions */
			_n(
				'The following PHP function is missing: %s. Please contact your host to finish installation.',
				'The following PHP functions are missing: %s. Please contact your host to finish installation.',
				count( $_amp_missing_functions ),
				'amp'
			),
			implode( ', ', $_amp_missing_functions )
		)
	);
}

unset( $_amp_required_extensions, $_amp_missing_extensions, $_amp_required_constructs, $_amp_missing_classes, $_amp_missing_functions, $_amp_required_extension, $_amp_construct_type, $_amp_construct, $_amp_constructs );

// DEV_CODE. This block of code is removed during the build process.
if ( ! file_exists( AMP__DIR__ . '/vendor/autoload.php' ) || ! file_exists( AMP__DIR__ . '/vendor/sabberworm/php-css-parser' ) || ! file_exists( AMP__DIR__ . '/assets/js/amp-block-editor.js' ) ) {
	$_amp_load_errors->add(
		'build_required',
		sprintf(
			/* translators: %s: composer install && npm install && npm run build:prod */
			__( 'You appear to be running the AMP plugin from source. Please do %s to finish installation.', 'amp' ), // phpcs:ignore WordPress.Security.EscapeOutput
			'<code>composer install &amp;&amp; npm install &amp;&amp; npm run build:prod</code>'
		)
	);
}

/**
 * Displays an admin notice about why the plugin is unable to load.
 *
 * @since 1.1.2
 * @internal
 * @global WP_Error $_amp_load_errors
 */
function _amp_show_load_errors_admin_notice() {
	global $_amp_load_errors;
	?>
	<div class="notice notice-error">
		<p>
			<strong><?php esc_html_e( 'AMP plugin unable to initialize.', 'amp' ); ?></strong>
			<ul>
			<?php foreach ( array_keys( $_amp_load_errors->errors ) as $error_code ) : ?>
				<?php foreach ( $_amp_load_errors->get_error_messages( $error_code ) as $message ) : ?>
					<li>
						<?php echo wp_kses_post( $message ); ?>
					</li>
				<?php endforeach; ?>
			<?php endforeach; ?>
			</ul>
		</p>
	</div>
	<?php
}

// Abort if dependencies are not satisfied.
if ( ! empty( $_amp_load_errors->errors ) ) {
	add_action( 'admin_notices', '_amp_show_load_errors_admin_notice' );

	if ( ( defined( 'WP_CLI' ) && WP_CLI ) || 'true' === getenv( 'CI' ) || 'cli' === PHP_SAPI ) {
		$messages = array( __( 'AMP plugin unable to initialize.', 'amp' ) );
		foreach ( array_keys( $_amp_load_errors->errors ) as $error_code ) {
			$messages = array_merge( $messages, $_amp_load_errors->get_error_messages( $error_code ) );
		}
		$message = implode( "\n * ", $messages );
		$message = str_replace( array( '<code>', '</code>' ), '`', $message );
		$message = html_entity_decode( $message, ENT_QUOTES, 'UTF-8' );

		if ( ! class_exists( 'WP_CLI' ) ) {
			echo "$message\n"; // phpcs:disable WordPress.Security.EscapeOutput.OutputNotEscaped

			exit( 1 );
		}

		WP_CLI::warning( $message );
	}

	return;
}

/**
 * Print admin notice if plugin installed with incorrect slug (which impacts WordPress's auto-update system).
 *
 * @since 1.0
 * @internal
 */
function _amp_incorrect_plugin_slug_admin_notice() {
	$actual_slug = basename( AMP__DIR__ );
	?>
	<div class="notice notice-warning">
		<p>
			<?php
			echo wp_kses_post(
				sprintf(
					/* translators: %1$s is the current directory name, and %2$s is the required directory name */
					__( 'You appear to have installed the AMP plugin incorrectly. It is currently installed in the <code>%1$s</code> directory, but it needs to be placed in a directory named <code>%2$s</code>. Please rename the directory. This is important for WordPress plugin auto-updates.', 'amp' ),
					$actual_slug,
					'amp'
				)
			);
			?>
		</p>
	</div>
	<?php
}

if ( 'amp' !== basename( AMP__DIR__ ) ) {
	add_action( 'admin_notices', '_amp_incorrect_plugin_slug_admin_notice' );
}

require_once AMP__DIR__ . '/vendor/autoload.php';

register_activation_hook( __FILE__, 'amp_activate' );

register_deactivation_hook( __FILE__, 'amp_deactivate' );

add_action( 'plugins_loaded', 'amp_bootstrap_plugin', defined( 'PHP_INT_MIN' ) ? PHP_INT_MIN : ~PHP_INT_MAX ); // phpcs:ignore PHPCompatibility.Constants.NewConstants.php_int_minFound