Added loading of WooPayments translation data from translate.wordpres…

…s.com

includes/class-wc-payments.php

@@ -652,6 +652,110 @@ public static function init() {
 		add_action( 'wp_enqueue_scripts', [ __CLASS__, 'enqueue_assets_script' ] );
 
 		self::$duplicate_payment_prevention_service->init( self::$card_gateway, self::$order_service );
+
+		// Load automated translations.
+		add_filter( 'pre_set_site_transient_update_plugins', [ __CLASS__, 'load_wcpay_translations' ] );
+	}
+
+	/**
+	 * Hooks into auto-update process to load plugin translations from translate.wordpress.com.
+	 *
+	 * Runs in a cron thread, or in a visitor thread if triggered
+	 * by _maybe_update_plugins(), or in an auto-update thread.
+	 *
+	 * @param object $transient The update_plugins transient object.
+	 *
+	 * @return object The same or a modified version of the transient.
+	 */
+	public static function load_wcpay_translations( $transient ) {
+		try {
+			if ( $transient instanceof stdClass ) {
+				$translations            = self::get_translations_update_data();
+				$merged_translations     = array_merge( isset( $transient->translations ) ? $transient->translations : [], $translations );
+				$transient->translations = $merged_translations;
+			}
+		} catch ( \Exception $ex ) {
+			// TODO: log error.
+			return $transient;
+		}
+		return $transient;
+	}
+
+	/**
+	 * Get translations updates information.
+	 *
+	 * @return array Update data {product_id => data}
+	 */
+	public static function get_translations_update_data() {
+		// TODO: lots of WP core code, probably worth moving out of this class.
+		$installed_translations = wp_get_installed_translations( 'plugins' );
+		$locales                = array_values( get_available_languages() );
+
+		if ( empty( $locales ) ) {
+			return [];
+		}
+
+		// Use the same timeout values as Woo Core https://github.com/woocommerce/woocommerce/blob/trunk/plugins/woocommerce/includes/admin/helper/class-wc-helper-updater.php#L257.
+		$timeout     = wp_doing_cron() ? 30 : 3;
+		$plugin_name = 'woocommerce-payments'; // TODO: check if there is a better way of getting the plugin name.
+
+		$request_body = [
+			'locales' => $locales,
+			'plugins' => [],
+		];
+
+		$request_body['plugins'][ $plugin_name ] = [
+			'version' => WCPAY_VERSION_NUMBER,
+		];
+
+		$raw_response = wp_remote_post(
+			'https://translate.wordpress.com/api/translations-updates/woocommerce',
+			[
+				'body'    => wp_json_encode( $request_body ),
+				'headers' => [ 'Content-Type: application/json' ],
+				'timeout' => $timeout,
+			]
+		);
+
+		// Something wrong happened on the translate server side.
+		$response_code = wp_remote_retrieve_response_code( $raw_response );
+		if ( 200 !== $response_code ) {
+			return [];
+		}
+
+		$response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
+
+		// API error, api returned but something was wrong.
+		if ( array_key_exists( 'success', $response ) && false === $response['success'] ) {
+			return [];
+		}
+
+		$language_packs = $response['data'][ $plugin_name ];
+
+		$translations = [];
+
+		foreach ( $language_packs as $language_pack ) {
+			// Maybe we have this language pack already installed so lets check revision date.
+			if ( array_key_exists( $plugin_name, $installed_translations ) && array_key_exists( $language_pack['wp_locale'], $installed_translations[ $plugin_name ] ) ) {
+				$installed_translation_revision_time = new DateTime( $installed_translations[ $plugin_name ][ $language_pack['wp_locale'] ]['PO-Revision-Date'] );
+				$new_translation_revision_time       = new DateTime( $language_pack['last_modified'] );
+				// Skip if translation language pack is not newer than what is installed already.
+				if ( $new_translation_revision_time <= $installed_translation_revision_time ) {
+					continue;
+				}
+			}
+			$translations[] = [
+				'type'       => 'plugin',
+				'slug'       => $plugin_name,
+				'language'   => $language_pack['wp_locale'],
+				'version'    => $language_pack['version'],
+				'updated'    => $language_pack['last_modified'],
+				'package'    => $language_pack['package'],
+				'autoupdate' => true,
+			];
+		}
+
+		return $translations;
 	}
 
 	/**