Add a language pack upgrader class.

At the conclusion of any upgrade, after the transients are refreshed from the API, pending translations are downloaded and installed to wp-content/languages.

props dd32.
see #18200.

Built from https://develop.svn.wordpress.org/trunk@25566


git-svn-id: http://core.svn.wordpress.org/trunk@25484 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-upgrader-skins.php

@@ -608,4 +608,18 @@ class Automatic_Upgrader_Skin extends WP_Upgrader_Skin {
 	function bulk_footer() {}
 	function before() {}
 	function after() {}
-}
+}
+
+/**
+ * A basic Upgrader skin which doesn't have any headers or footers.
+ *
+ * @package WordPress
+ * @subpackage Upgrader
+ * @since 3.7.0
+ */
+class Headerless_Upgrader_Skin extends WP_Upgrader_Skin {
+	function before() {}
+	function after() {}
+	function header() {}
+	function footer() {}
+}

wp-admin/includes/class-wp-upgrader.php

@@ -1073,6 +1073,127 @@ class Theme_Upgrader extends WP_Upgrader {
 
 }
 
+add_action( 'upgrader_process_complete', array( 'Language_Pack_Upgrader', 'async_upgrade' ), 20, 3 );
+class Language_Pack_Upgrader extends WP_Upgrader {
+
+	var $result;
+	var $bulk = true;
+
+	static function async_upgrade( $upgrader, $context, $package ) {
+		// Avoid recursion.
+		if ( $upgrader instanceof Language_Pack_Upgrader )
+			return;
+
+		$lp_upgrader = new Language_Pack_Upgrader( new Headerless_Upgrader_Skin() );
+		$lp_upgrader->upgrade();
+	}
+
+	function upgrade_strings() {
+		$this->strings['starting_upgrade'] = __( 'Some of your language files need updating. Sit tight for a few more seconds while we update them as well.' );
+		$this->strings['up_to_date'] = __( 'The language is up to date.' ); // We need to silently skip this case
+		$this->strings['no_package'] = __( 'Update package not available.' );
+		$this->strings['downloading_package'] = __( 'Downloading language update from <span class="code">%s</span>&#8230;' );
+		$this->strings['unpack_package'] = __( 'Unpacking the update&#8230;' );
+		$this->strings['process_failed'] = __( 'Language update failed.' );
+		$this->strings['process_success'] = __( 'Language updated successfully.' );
+	}
+
+	function upgrade() {
+		return $this->bulk_upgrade();
+	}
+
+	function bulk_upgrade() {
+
+		$this->init();
+		$this->upgrade_strings();
+
+		$language_updates = wp_get_translation_updates();
+
+		if ( empty( $language_updates ) )
+			return true;
+
+		$this->skin->feedback( 'starting_upgrade' );
+
+		add_filter( 'upgrader_source_selection', array( &$this, 'check_package' ), 10, 3 );
+
+		$this->skin->header();
+
+		// Connect to the Filesystem first.
+		$res = $this->fs_connect( array( WP_CONTENT_DIR, WP_LANG_DIR ) );
+		if ( ! $res ) {
+			$this->skin->footer();
+			return false;
+		}
+
+		$results = array();
+
+		$this->update_count = count( $language_updates );
+		$this->update_current = 0;
+		foreach ( $language_updates as $language_update ) {
+
+			$destination = WP_LANG_DIR;
+			if ( 'plugin' == $language_update->type )
+				$destination .= '/plugins';
+			elseif ( 'theme' == $language_update->type )
+				$destination .= '/themes';
+
+			$this->update_current++;
+
+			$options = array(
+				'package' => $language_update->package,
+				'destination' => $destination,
+				'clear_destination' => false,
+				'abort_if_destination_exists' => false, // We expect the destination to exist.
+				'clear_working' => true,
+				'is_multi' => true,
+				'hook_extra' => array(
+					'language_update_type' => $language_update->type,
+					'language_update' => $language_update,
+				)
+			);
+
+			$result = $this->run( $options );
+
+			$results[] = $this->result;
+
+			// Prevent credentials auth screen from displaying multiple times.
+			if ( false === $result )
+				break;
+		}
+
+		// Clean up our hooks, in case something else does an upgrade on this connection.
+		remove_filter( 'upgrader_source_selection', array( &$this, 'check_package' ), 10, 2 );
+
+		return $results;
+	}
+
+	function check_package( $source, $remote_source ) {
+		global $wp_filesystem;
+
+		if ( is_wp_error( $source ) )
+			return $source;
+
+		// Check that the folder contains a valid language.
+		$files = $wp_filesystem->dirlist( $remote_source );
+
+		// Check to see if a .po and .mo exist in the folder.
+		$po = $mo = false;
+		foreach ( (array) $files as $file => $filedata ) {
+			if ( '.po' == substr( $file, -3 ) )
+				$po = true;
+			elseif ( '.mo' == substr( $file, -3 ) )
+				$mo = true;
+		}
+
+		if ( ! $mo || ! $po )
+			return new WP_Error( 'incompatible_archive', $this->strings['incompatible_archive'],
+				__( 'The language pack is missing either the <code>.po</code> or <code>.mo</code> files.' ) );
+
+		return $source;
+	}
+
+}
+
 /**
  * Core Upgrader class for WordPress. It allows for WordPress to upgrade itself in combination with the wp-admin/includes/update-core.php file
  *

wp-admin/includes/update.php

@@ -379,3 +379,25 @@ function maintenance_nag() {
 	echo "<div class='update-nag'>$msg</div>";
 }
 add_action( 'admin_notices', 'maintenance_nag' );
+
+/**
+ * Retrieves a list of all language updates available.
+ *
+ * @since 3.7.0
+ */
+function wp_get_translation_updates() {
+	$updates = array();
+	$transients = array( 'update_core' => 'core', 'update_plugins' => 'plugin', 'update_themes' => 'theme' );
+	foreach ( $transients as $transient => $type ) {
+
+		$transient = get_site_transient( $transient );
+		if ( empty( $transient->translations ) )
+			continue;
+
+		foreach ( $transient->translations as $translation ) {
+			$updates[] = (object) $translation;
+		}
+	}
+
+	return $updates;
+}

wp-includes/update.php

@@ -158,6 +158,9 @@ function wp_update_plugins() {
 
 	// Check for update on a different schedule, depending on the page.
 	switch ( current_filter() ) {
+		case 'upgrader_process_complete' :
+			$timeout = 0;
+			break;
 		case 'load-update-core.php' :
 			$timeout = MINUTE_IN_SECONDS;
 			break;
@@ -283,6 +286,9 @@ function wp_update_themes() {
 
 	// Check for update on a different schedule, depending on the page.
 	switch ( current_filter() ) {
+		case 'upgrader_process_complete' :
+			$timeout = 0;
+			break;
 		case 'load-update-core.php' :
 			$timeout = MINUTE_IN_SECONDS;
 			break;
@@ -485,18 +491,21 @@ if ( ( ! is_main_site() && ! is_network_admin() ) || ( defined( 'DOING_AJAX' ) &
 
 add_action( 'admin_init', '_maybe_update_core' );
 add_action( 'wp_version_check', 'wp_version_check' );
+add_action( 'upgrader_process_complete', 'wp_version_check' );
 
 add_action( 'load-plugins.php', 'wp_update_plugins' );
 add_action( 'load-update.php', 'wp_update_plugins' );
 add_action( 'load-update-core.php', 'wp_update_plugins' );
 add_action( 'admin_init', '_maybe_update_plugins' );
 add_action( 'wp_update_plugins', 'wp_update_plugins' );
+add_action( 'upgrader_process_complete', 'wp_update_plugins' );
 
 add_action( 'load-themes.php', 'wp_update_themes' );
 add_action( 'load-update.php', 'wp_update_themes' );
 add_action( 'load-update-core.php', 'wp_update_themes' );
 add_action( 'admin_init', '_maybe_update_themes' );
 add_action( 'wp_update_themes', 'wp_update_themes' );
+add_action( 'upgrader_process_complete', 'wp_update_themes' );
 
 // Automatic Updates - Cron callback
 add_action( 'wp_auto_updates_maybe_update', 'wp_auto_updates_maybe_update' );