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Filename : Api.php
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<?php
namespace Automattic\WooCommerce\Blocks\Assets;

use Automattic\WooCommerce\Blocks\Domain\Package;
use Exception;
use Automattic\Jetpack\Constants;
/**
 * The Api class provides an interface to various asset registration helpers.
 *
 * Contains asset api methods
 *
 * @since 2.5.0
 */
class Api {

	/**
	 * Stores the prefixed WC version. Used because the WC Blocks version has not been updated since the monorepo merge.
	 *
	 * @var string
	 */
	public $wc_version;

	/**
	 * Stores inline scripts already enqueued.
	 *
	 * @var array
	 */
	private $inline_scripts = [];

	/**
	 * Determines if caching is enabled for script data.
	 *
	 * @var boolean
	 */
	private $disable_cache = false;

	/**
	 * Stores loaded script data for the current request
	 *
	 * @var array|null
	 */
	private $script_data = null;

	/**
	 * Tracks whether script_data was modified during the current request.
	 *
	 * @var boolean
	 */
	private $script_data_modified = false;

	/**
	 * Stores the hash for the script data, made up of the site url, plugin version and package path.
	 *
	 * @var string
	 */
	private $script_data_hash;

	/**
	 * Stores the transient key used to cache the script data. This will change if the site is accessed via HTTPS or HTTP.
	 *
	 * @var string
	 */
	private $script_data_transient_key = 'woocommerce_blocks_asset_api_script_data';

	/**
	 * Reference to the Package instance
	 *
	 * @var Package
	 */
	private $package;

	/**
	 * Constructor for class
	 *
	 * @param Package $package An instance of Package.
	 */
	public function __construct( Package $package ) {
		// Use wc- prefix here to prevent collisions when WC Core version catches up to a version previously used by the WC Blocks feature plugin.
		$this->wc_version    = 'wc-' . Constants::get_constant( 'WC_VERSION' );
		$this->package       = $package;
		$this->disable_cache = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) || wp_get_environment_type() !== 'production';

		// If the site is accessed via HTTPS, change the transient key. This is to prevent the script URLs being cached
		// with the first scheme they are accessed on after cache expiry.
		if ( is_ssl() ) {
			$this->script_data_transient_key .= '_ssl';
		}
		if ( ! $this->disable_cache ) {
			$this->script_data_hash = $this->get_script_data_hash();
		}
		add_action( 'shutdown', array( $this, 'update_script_data_cache' ), 20 );
	}

	/**
	 * Get the file modified time as a cache buster if we're in dev mode.
	 *
	 * @param string $file Local path to the file (relative to the plugin
	 *                     directory).
	 * @return string The cache buster value to use for the given file.
	 */
	protected function get_file_version( $file ) {
		if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG && file_exists( $this->package->get_path() . $file ) ) {
			return filemtime( $this->package->get_path( trim( $file, '/' ) ) );
		}
		return $this->wc_version;
	}

	/**
	 * Retrieve the url to an asset for this plugin.
	 *
	 * @param string $relative_path An optional relative path appended to the
	 *                              returned url.
	 *
	 * @return string
	 */
	protected function get_asset_url( $relative_path = '' ) {
		return $this->package->get_url( $relative_path );
	}

	/**
	 * Get the path to a block's metadata
	 *
	 * @param string $block_name The block to get metadata for.
	 * @param string $path Optional. The path to the metadata file inside the 'assets/client/blocks' folder.
	 *
	 * @return string|boolean False if metadata file is not found for the block.
	 */
	public function get_block_metadata_path( $block_name, $path = '' ) {
		$path_to_metadata_from_plugin_root = $this->package->get_path( 'assets/client/blocks/' . $path . $block_name . '/block.json' );
		if ( ! file_exists( $path_to_metadata_from_plugin_root ) ) {
			return false;
		}
		return $path_to_metadata_from_plugin_root;
	}

	/**
	 * Generates a hash containing the site url, plugin version and package path.
	 *
	 * Moving the plugin, changing the version, or changing the site url will result in a new hash and the cache will be invalidated.
	 *
	 * @return string The generated hash.
	 */
	private function get_script_data_hash() {
		return md5( get_option( 'siteurl', '' ) . $this->wc_version . $this->package->get_path() );
	}

	/**
	 * Initialize and load cached script data from the transient cache.
	 *
	 * @return array
	 */
	private function get_cached_script_data() {
		if ( $this->disable_cache ) {
			return [];
		}

		$transient_value = json_decode( (string) get_transient( $this->script_data_transient_key ), true );

		if (
			json_last_error() !== JSON_ERROR_NONE ||
			empty( $transient_value ) ||
			empty( $transient_value['script_data'] ) ||
			empty( $transient_value['version'] ) ||
			$transient_value['version'] !== $this->wc_version ||
			empty( $transient_value['hash'] ) ||
			$transient_value['hash'] !== $this->script_data_hash
		) {
			return [];
		}

		return (array) ( $transient_value['script_data'] ?? [] );
	}

	/**
	 * Store all cached script data in the transient cache.
	 */
	public function update_script_data_cache() {
		if ( is_null( $this->script_data ) || $this->disable_cache ) {
			return;
		}
		if ( ! $this->script_data_modified ) {
			return;
		}
		set_transient(
			$this->script_data_transient_key,
			wp_json_encode(
				array(
					'script_data' => $this->script_data,
					'version'     => $this->wc_version,
					'hash'        => $this->script_data_hash,
				)
			),
			DAY_IN_SECONDS * 30
		);
	}

	/**
	 * Use package path to find an asset data file and return the data.
	 *
	 * @param string $filename The filename of the asset.
	 * @return array The asset data.
	 */
	public function get_asset_data( $filename ) {
		$asset_path = $this->package->get_path( $filename );
		$asset      = file_exists( $asset_path ) ? require $asset_path : [];
		return $asset;
	}

	/**
	 * Get src, version and dependencies given a script relative src.
	 *
	 * @param string $relative_src Relative src to the script.
	 * @param array  $dependencies Optional. An array of registered script handles this script depends on. Default empty array.
	 *
	 * @return array src, version and dependencies of the script.
	 */
	public function get_script_data( $relative_src, $dependencies = [] ) {
		if ( ! $relative_src ) {
			return array(
				'src'          => '',
				'version'      => '1',
				'dependencies' => $dependencies,
			);
		}

		if ( is_null( $this->script_data ) ) {
			$this->script_data = $this->get_cached_script_data();
		}

		if ( empty( $this->script_data[ $relative_src ] ) ) {
			$asset_path = $this->package->get_path( str_replace( '.js', '.asset.php', $relative_src ) );
			// The following require is safe because we are checking if the file exists and it is not a user input.
			// nosemgrep audit.php.lang.security.file.inclusion-arg.
			$asset = file_exists( $asset_path ) ? require $asset_path : [];

			$this->script_data[ $relative_src ] = array(
				'src'          => $this->get_asset_url( $relative_src ),
				'version'      => ! empty( $asset['version'] ) ? $asset['version'] : $this->get_file_version( $relative_src ),
				'dependencies' => ! empty( $asset['dependencies'] ) ? $asset['dependencies'] : [],
			);
			$this->script_data_modified         = true;
		}

		// Return asset details as well as the requested dependencies array.
		return [
			'src'          => $this->script_data[ $relative_src ]['src'],
			'version'      => $this->script_data[ $relative_src ]['version'],
			'dependencies' => array_merge( $this->script_data[ $relative_src ]['dependencies'], $dependencies ),
		];
	}

	/**
	 * Registers a script according to `wp_register_script`, adding the correct prefix, and additionally loading translations.
	 *
	 * When creating script assets, the following rules should be followed:
	 *   1. All asset handles should have a `wc-` prefix.
	 *   2. If the asset handle is for a Block (in editor context) use the `-block` suffix.
	 *   3. If the asset handle is for a Block (in frontend context) use the `-block-frontend` suffix.
	 *   4. If the asset is for any other script being consumed or enqueued by the blocks plugin, use the `wc-blocks-` prefix.
	 *
	 * @since 2.5.0
	 * @throws Exception If the registered script has a dependency on itself.
	 *
	 * @param string $handle        Unique name of the script.
	 * @param string $relative_src  Relative url for the script to the path from plugin root.
	 * @param array  $dependencies  Optional. An array of registered script handles this script depends on. Default empty array.
	 * @param bool   $has_i18n      Optional. Whether to add a script translation call to this file. Default: true.
	 */
	public function register_script( $handle, $relative_src, $dependencies = [], $has_i18n = true ) {
		$script_data = $this->get_script_data( $relative_src, $dependencies );

		if ( in_array( $handle, $script_data['dependencies'], true ) ) {
			if ( wp_get_environment_type() === 'development' ) {
				$dependencies = array_diff( $script_data['dependencies'], [ $handle ] );
					add_action(
						'admin_notices',
						function () use ( $handle ) {
								echo '<div class="error"><p>';
								/* translators: %s file handle name. */
								printf( esc_html__( 'Script with handle %s had a dependency on itself which has been removed. This is an indicator that your JS code has a circular dependency that can cause bugs.', 'woocommerce' ), esc_html( $handle ) );
								echo '</p></div>';
						}
					);
			} else {
				throw new Exception( sprintf( 'Script with handle %s had a dependency on itself. This is an indicator that your JS code has a circular dependency that can cause bugs.', $handle ) );
			}
		}

		/**
		 * Filters the list of script dependencies.
		 *
		 * @since 3.0.0
		 *
		 * @param array $dependencies The list of script dependencies.
		 * @param string $handle The script's handle.
		 * @return array
		 */
		$script_dependencies = apply_filters( 'woocommerce_blocks_register_script_dependencies', $script_data['dependencies'], $handle );

		wp_register_script( $handle, $script_data['src'], $script_dependencies, $script_data['version'], true );

		if ( $has_i18n && function_exists( 'wp_set_script_translations' ) ) {
			wp_set_script_translations( $handle, 'woocommerce', $this->package->get_path( 'languages' ) );
			wp_set_script_translations( $handle, 'woocommerce', $this->package->get_path( 'i18n/languages' ) );
		}
	}

	/**
	 * Registers a style according to `wp_register_style`.
	 *
	 * @since 2.5.0
	 * @since 2.6.0 Change src to be relative source.
	 *
	 * @param string  $handle       Name of the stylesheet. Should be unique.
	 * @param string  $relative_src Relative source of the stylesheet to the plugin path.
	 * @param array   $deps         Optional. An array of registered stylesheet handles this stylesheet depends on. Default empty array.
	 * @param string  $media        Optional. The media for which this stylesheet has been defined. Default 'all'. Accepts media types like
	 *                              'all', 'print' and 'screen', or media queries like '(orientation: portrait)' and '(max-width: 640px)'.
	 * @param boolean $rtl   Optional. Whether or not to register RTL styles.
	 */
	public function register_style( $handle, $relative_src, $deps = [], $media = 'all', $rtl = false ) {
		$filename = str_replace( plugins_url( '/', dirname( __DIR__ ) ), '', $relative_src );
		$src      = $this->get_asset_url( $relative_src );
		$ver      = $this->get_file_version( $filename );
		wp_register_style( $handle, $src, $deps, $ver, $media );

		if ( $rtl ) {
			wp_style_add_data( $handle, 'rtl', 'replace' );
		}
	}

	/**
	 * Returns the appropriate asset path for current builds.
	 *
	 * @param   string $filename  Filename for asset path (without extension).
	 * @param   string $type      File type (.css or .js).
	 * @return  string             The generated path.
	 */
	public function get_block_asset_build_path( $filename, $type = 'js' ) {
		return "assets/client/blocks/$filename.$type";
	}

	/**
	 * Adds an inline script, once.
	 *
	 * @param string $handle Script handle.
	 * @param string $script Script contents.
	 */
	public function add_inline_script( $handle, $script ) {
		if ( ! empty( $this->inline_scripts[ $handle ] ) && in_array( $script, $this->inline_scripts[ $handle ], true ) ) {
			return;
		}

		wp_add_inline_script( $handle, $script );

		if ( isset( $this->inline_scripts[ $handle ] ) ) {
			$this->inline_scripts[ $handle ][] = $script;
		} else {
			$this->inline_scripts[ $handle ] = array( $script );
		}
	}
}