#538660 by JacobSingh, dww, JoshuaRogers, adrian, Crell, chx, anarcat, and...

#538660 by JacobSingh, dww, JoshuaRogers, adrian, Crell, chx, anarcat, and cwgordon7: Add a functioning Plugin Manager to core. Can you say module installation and updates through the UI? I knew you could! :D

authorize.php

+<?php
+// $Id$
+
+/**
+ * @file
+ * Administrative script where the site owner (the user actually owning the
+ * files on the webserver) can authorize certain file-related operations to
+ * proceed with elevated privileges, for example to deploy and upgrade modules
+ * or themes. Users should not visit this page directly, but instead use an
+ * administrative user interface which knows how to redirect the user to this
+ * script as part of a multistep process. This script actually performs the
+ * selected operations without loading all of Drupal, to be able to more
+ * gracefully recover from errors. Access to the script is controlled by a
+ * global killswitch in settings.php ('allow_authorize_operations') and via
+ * the 'administer software updates' permission.
+ *
+ * @see system_run_authorized()
+ */
+
+/**
+ * Root directory of Drupal installation.
+ */
+define('DRUPAL_ROOT', getcwd());
+
+/**
+ * Global flag to identify update.php and authorize.php runs, and so
+ * avoid various unwanted operations, such as hook_init() and
+ * hook_exit() invokes, css/js preprocessing and translation, and
+ * solve some theming issues. This flag is checked on several places
+ * in Drupal code (not just authorize.php).
+ */
+define('MAINTENANCE_MODE', 'update');
+
+/**
+ * Render a 403 access denied page for authorize.php
+ */
+function authorize_access_denied_page() {
+  drupal_add_http_header('403 Forbidden');
+  watchdog('access denied', 'authorize.php', NULL, WATCHDOG_WARNING);
+  drupal_set_title('Access denied');
+  return t("You are not allowed to access this page.");
+}
+
+/**
+ * Determine if the current user is allowed to run authorize.php.
+ *
+ * The killswitch in settings.php overrides all else, otherwise, the user must
+ * have access to the 'administer software updates' permission.
+ *
+ * @return
+ *   TRUE if the current user can run authorize.php, otherwise FALSE.
+ */
+function authorize_access_allowed() {
+  return variable_get('allow_authorize_operations', TRUE) && user_access('administer software updates');
+}
+
+// *** Real work of the script begins here. ***
+
+require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+require_once DRUPAL_ROOT . '/includes/session.inc';
+require_once DRUPAL_ROOT . '/includes/common.inc';
+require_once DRUPAL_ROOT . '/includes/file.inc';
+require_once DRUPAL_ROOT . '/includes/module.inc';
+
+// We prepare only a minimal bootstrap. This includes the database and
+// variables, however, so we have access to the class autoloader registry.
+drupal_bootstrap(DRUPAL_BOOTSTRAP_SESSION);
+
+// This must go after drupal_bootstrap(), which unsets globals!
+global $conf;
+
+// We have to enable the user and system modules, even to check access and
+// display errors via the maintainence theme.
+$module_list['system']['filename'] = 'modules/system/system.module';
+$module_list['user']['filename'] = 'modules/user/user.module';
+module_list(TRUE, FALSE, FALSE, $module_list);
+drupal_load('module', 'system');
+drupal_load('module', 'user');
+
+// We also want to have the language system available, but we do *NOT* want to
+// actually call drupal_bootstrap(DRUPAL_BOOTSTRAP_LANGUAGE), since that would
+// also force us through the DRUPAL_BOOTSTRAP_PAGE_HEADER phase, which loads
+// all the modules, and that's exactly what we're trying to avoid.
+drupal_language_initialize();
+
+// Initialize the maintenance theme for this administrative script.
+drupal_maintenance_theme();
+
+$output = '';
+$show_messages = TRUE;
+
+if (authorize_access_allowed()) {
+  // Load both the Form API and Batch API.
+  require_once DRUPAL_ROOT . '/includes/form.inc';
+  require_once DRUPAL_ROOT . '/includes/batch.inc';
+  // Load the code that drives the authorize process.
+  require_once DRUPAL_ROOT . '/includes/authorize.inc';
+
+  // Initialize the URL path, but not via raising our bootstrap level.
+  drupal_path_initialize();
+
+  if (isset($_SESSION['authorize_operation']['page_title'])) {
+    drupal_set_title(check_plain($_SESSION['authorize_operation']['page_title']));
+  }
+  else {
+    drupal_set_title(t('Authorize file system changes'));
+  }
+
+  // See if we've run the operation and need to display a report.
+  if (isset($_SESSION['authorize_results']) && $results = $_SESSION['authorize_results']) {
+
+    // Clear the session out.
+    unset($_SESSION['authorize_results']);
+    unset($_SESSION['authorize_operation']);
+    unset($_SESSION['authorize_filetransfer_backends']);
+
+    if (!empty($results['page_title'])) {
+      drupal_set_title(check_plain($results['page_title']));
+    }
+    if (!empty($results['page_message'])) {
+      drupal_set_message($results['page_message']['message'], $results['page_message']['type']);
+    }
+
+    $output = theme('authorize_report', array('messages' => $results['messages']));
+    
+    $links = array();
+    if (is_array($results['tasks'])) {
+      $links += $results['tasks'];
+    }
+
+    $links = array_merge($links, array(
+      l(t('Administration pages'), 'admin'),
+      l(t('Front page'), '<front>'),
+    ));
+
+    $output .= theme('item_list', array('items' => $links));
+  }
+  // If a batch is running, let it run.
+  elseif (isset($_GET['batch'])) {
+    $output = _batch_page();
+  }
+  else {
+    if (empty($_SESSION['authorize_operation']) || empty($_SESSION['authorize_filetransfer_backends'])) {
+      $output = t("It appears you have reached this page in error.");
+    }
+    elseif (!$batch = batch_get()) {
+      // We have a batch to process, show the filetransfer form.
+      $output = drupal_render(drupal_get_form('authorize_filetransfer_form'));
+    }
+  }
+  // We defer the display of messages until all operations are done.
+  $show_messages = !(($batch = batch_get()) && isset($batch['running']));
+}
+else {
+  $output = authorize_access_denied_page();
+}
+
+if (!empty($output)) {
+  print theme('update_page', array('content' => $output, 'show_messages' => $show_messages));
+}
+

includes/authorize.inc

+<?php
+// $Id$
+
+/**
+ * @file
+ * Helper functions and form handlers used for the authorize.php script.
+ */
+
+/**
+ * Build the form for choosing a FileTransfer type and supplying credentials.
+ */
+function authorize_filetransfer_form($form_state) {
+  global $base_url;
+  $form = array();
+
+  $form['#action'] = $base_url . '/authorize.php';
+  // CSS we depend on lives in modules/system/maintenance.css, which is loaded
+  // via the default maintenance theme.
+  $form['#attached']['js'][] = $base_url . '/misc/authorize.js';
+  
+  // Get all the available ways to transfer files.
+  if (empty($_SESSION['authorize_filetransfer_backends'])) {
+    drupal_set_message(t('Unable to continue, no available methods of file transfer'), 'error');
+    return array();
+  }
+  $available_backends = $_SESSION['authorize_filetransfer_backends'];
+  uasort($available_backends, 'drupal_sort_weight');
+
+  // Decide on a default backend.
+  if (isset($form_state['values']['connection_settings']['authorize_filetransfer_default'])) {
+    $authorize_filetransfer_default = $form_state['values']['connection_settings']['authorize_filetransfer_default'];
+  }
+  elseif ($authorize_filetransfer_default = variable_get('authorize_filetransfer_default', NULL));
+  else {
+    $authorize_filetransfer_default = key($available_backends);
+  }
+
+  $form['information']['main_header'] = array(
+    '#prefix' => '<h3>',
+    '#markup' => t('To continue please provide your server connection details'),
+    '#suffix' => '</h3>',
+  );
+
+  $form['connection_settings']['#tree'] = TRUE;
+  $form['connection_settings']['authorize_filetransfer_default'] = array(
+    '#type' => 'select',
+    '#title' => t('Connection method'),
+    '#default_value' => $authorize_filetransfer_default,
+    '#weight' => -10,
+  );
+
+  /*
+   * Here we create two submit buttons. For a JS enabled client, they will
+   * only ever see submit_process. However, if a client doesn't have JS
+   * enabled, they will see submit_connection on the first form (whden picking
+   * what filetranfer type to use, and submit_process on the second one (which
+   * leads to the actual operation)
+   */
+  $form['submit_connection'] = array(
+    '#prefix' => "<br style='clear:both'/>",
+    '#name' => 'enter_connection_settings', // This is later changed in JS.
+    '#type' => 'submit',
+    '#value' => t('Enter connetion settings'), // As is this. @see authorize.js.
+    '#weight' => 100,
+  );
+
+  $form['submit_process'] = array(
+    '#name' => 'process_updates', // This is later changed in JS.
+    '#type' => 'submit',
+    '#value' => t('Process Updates'), // As is this. @see authorize.js
+    '#weight' => 100,
+    '#attributes' => array('style' => 'display:none'),
+  );
+
+  // Build a hidden fieldset for each one.
+  foreach ($available_backends as $name => $backend) {
+    $form['connection_settings']['authorize_filetransfer_default']['#options'][$name] = $backend['title'];
+    $form['connection_settings'][$name] = array(
+      '#type' => 'fieldset',
+      '#attributes' => array('class' => "filetransfer-$name filetransfer"),
+      '#title' => t('@backend connection settings', array('@backend' => $backend['title'])),
+    );
+
+    $current_settings = variable_get("authorize_filetransfer_connection_settings_" . $name, array());
+    $form['connection_settings'][$name] += system_get_filetransfer_settings_form($name, $current_settings);
+
+    // Start non-JS code.
+    if (isset($form_state['values']['connection_settings']['authorize_filetransfer_default']) && $form_state['values']['connection_settings']['authorize_filetransfer_default'] == $name) {
+
+      // If the user switches from JS to non-JS, Drupal (and Batch API) will
+      // barf. This is a known bug: http://drupal.org/node/229825.
+      setcookie('has_js', '', time() - 3600, '/');
+      unset($_COOKIE['has_js']);
+
+      // Change the submit button to the submit_process one.
+      $form['submit_process']['#attributes'] = array();
+      unset($form['submit_connection']);
+
+      // Activate the proper filetransfer settings form.
+      $form['connection_settings'][$name]['#attributes']['style'] = 'display:block';
+      // Disable the select box.
+      $form['connection_settings']['authorize_filetransfer_default']['#disabled'] = TRUE;
+
+      // Create a button for changing the type of connection.
+      $form['connection_settings']['change_connection_type'] = array(
+        '#name' => 'change_connection_type',
+        '#type' => 'submit',
+        '#value' => t('Change connection type'),
+        '#weight' => -5,
+        '#attributes' => array('class' => 'filetransfer-change-connection-type'),
+      );
+    }
+    // End non-JS code.
+  }
+  return $form;
+}
+
+/**
+ * Validate callback for the filetransfer authorization form.
+ *
+ * @see authorize_filetransfer_form()
+ */
+function authorize_filetransfer_form_validate($form, &$form_state) {
+  if (isset($form_state['values']['connection_settings'])) {
+    $backend = $form_state['values']['connection_settings']['authorize_filetransfer_default'];
+    $filetransfer = authorize_get_filetransfer($backend, $form_state['values']['connection_settings'][$backend]);
+    try {
+      if (!$filetransfer) {
+        throw new Exception(t("Error, this type of connection protocol (%backend) doesn't exist.", array('%backend' => $backend)));
+      }
+      $filetransfer->connect();
+    }
+    catch (Exception $e) {
+      form_set_error('connection_settings', $e->getMessage());
+    }
+  }
+}
+
+/**
+ * Submit callback when a file transfer is being authorized.
+ *
+ * @see authorize_filetransfer_form()
+ */
+function authorize_filetransfer_form_submit($form, &$form_state) {
+  global $base_url;
+  switch ($form_state['clicked_button']['#name']) {
+    case 'process_updates':
+
+      // Save the connection settings to the DB.
+      $filetransfer_backend = $form_state['values']['connection_settings']['authorize_filetransfer_default'];
+
+      // If the database is available then try to save our settings. We have
+      // to make sure it is available since this code could potentially (will
+      // likely) be called during the installation process, before the
+      // database is set up.
+      if (db_is_active()) {
+        $connection_settings = array();
+        foreach ($form_state['values']['connection_settings'][$filetransfer_backend] as $key => $value) {
+          // We do *not* want to store passwords in the database, unless the
+          // backend explicitly says so via the magic #filetransfer_save form
+          // property. Otherwise, we store everything that's not explicitly
+          // marked with #filetransfer_save set to FALSE.
+          if (!isset($form['connection_settings'][$filetransfer_backend][$key]['#filetransfer_save'])) {
+            if ($form['connection_settings'][$filetransfer_backend][$key]['#type'] != 'password') {
+              $connection_settings[$key] = $value;
+            }
+          }
+          // The attribute is defined, so only save if set to TRUE.
+          elseif ($form['connection_settings'][$filetransfer_backend][$key]['#filetransfer_save']) {
+            $connection_settings[$key] = $value;
+          }
+        }
+        // Set this one as the default authorize method.
+        variable_set('authorize_filetransfer_default', $filetransfer_backend);
+        // Save the connection settings minus the password.
+        variable_set("authorize_filetransfer_connection_settings_" . $filetransfer_backend, $connection_settings);
+
+        $filetransfer = authorize_get_filetransfer($filetransfer_backend, $form_state['values']['connection_settings'][$filetransfer_backend]);
+        
+        // Now run the operation.
+        authorize_run_operation($filetransfer);
+      }
+      break;
+
+    case 'enter_connection_settings':
+      $form_state['rebuild'] = TRUE;
+      break;
+
+    case 'change_connection_type':
+      $form_state['rebuild'] = TRUE;
+      unset($form_state['values']['connection_settings']['authorize_filetransfer_default']);
+      break;
+  }
+}
+
+/**
+ * Run the operation specified in $_SESSION['authorize_operation']
+ *
+ * @param $filetransfer
+ *   The FileTransfer object to use for running the operation.
+ */
+function authorize_run_operation($filetransfer) {
+  $operation = $_SESSION['authorize_operation'];
+  unset($_SESSION['authorize_operation']);
+
+  if (!empty($operation['page_title'])) {
+    drupal_set_title(check_plain($operation['page_title']));
+  }
+
+  require_once DRUPAL_ROOT . '/' . $operation['file'];
+  call_user_func_array($operation['callback'], array_merge(array($filetransfer), $operation['arguments']));
+}
+
+/**
+ * Get a FileTransfer class for a specific transfer method and settings.
+ *
+ * @param $backend
+ *   The FileTransfer backend to get the class for.
+ * @param $settings
+ *   Array of settings for the FileTransfer.
+ * @return
+ *   An instantiated FileTransfer object for the requested method and settings,
+ *   or FALSE if there was an error finding or instantiating it.
+ */
+function authorize_get_filetransfer($backend, $settings = array()) {
+  $filetransfer = FALSE;
+  if (!empty($_SESSION['authorize_filetransfer_backends'][$backend])) {
+    $filetransfer = call_user_func_array(array($_SESSION['authorize_filetransfer_backends'][$backend]['class'], 'factory'), array(DRUPAL_ROOT, $settings));
+  }
+  return $filetransfer;
+}
+

includes/common.inc

@@ -4993,23 +4993,10 @@ function drupal_common_theme() {
       'arguments' => array('page' => NULL),
       'template' => 'page',
     ),
-    'maintenance_page' => array(
-      'arguments' => array('content' => NULL, 'show_messages' => TRUE),
-      'template' => 'maintenance-page',
-    ),
-    'update_page' => array(
-      'arguments' => array('content' => NULL, 'show_messages' => TRUE),
-    ),
-    'install_page' => array(
-      'arguments' => array('content' => NULL),
-    ),
     'region' => array(
       'arguments' => array('elements' => NULL),
       'template' => 'region',
     ),
-    'task_list' => array(
-      'arguments' => array('items' => NULL, 'active' => NULL),
-    ),
     'status_messages' => array(
       'arguments' => array('display' => NULL),
     ),
@@ -5064,6 +5051,26 @@ function drupal_common_theme() {
     'indentation' => array(
       'arguments' => array('size' => 1),
     ),
+    // from theme.maintenance.inc
+    'maintenance_page' => array(
+      'arguments' => array('content' => NULL, 'show_messages' => TRUE),
+      'template' => 'maintenance-page',
+    ),
+    'update_page' => array(
+      'arguments' => array('content' => NULL, 'show_messages' => TRUE),
+    ),
+    'install_page' => array(
+      'arguments' => array('content' => NULL),
+    ),
+    'task_list' => array(
+      'arguments' => array('items' => NULL, 'active' => NULL),
+    ),
+    'authorize_message' => array(
+      'arguments' => array('message' => NULL, 'success' => TRUE),
+    ),
+    'authorize_report' => array(
+      'arguments' => array('messages' => array()),
+    ),
     // from pager.inc
     'pager' => array(
       'arguments' => array('tags' => array(), 'element' => 0, 'parameters' => array(), 'quantity' => 9),
@@ -5989,3 +5996,26 @@ function archiver_get_archiver($file) {
   }
 }
 
+/**
+ * Drupal Updater registry.
+ *
+ * An Updater is a class that knows how to update various parts of the Drupal
+ * file system, for example to update modules that have newer releases, or to
+ * install a new theme.
+ *
+ * @return
+ *   Returns the Drupal Updater class registry.
+ *
+ * @see hook_updater_info()
+ * @see hook_updater_info_alter()
+ */
+function drupal_get_updaters() {
+  $updaters = &drupal_static(__FUNCTION__);
+  if (!isset($updaters)) {
+    $updaters = module_invoke_all('updater_info');
+    drupal_alter('updater_info', $updaters);
+    uasort($updaters, 'drupal_sort_weight');
+  }
+  return $updaters;
+}
+

includes/filetransfer/ftp.inc

@@ -5,6 +5,15 @@
  * Connection class using the FTP URL wrapper.
  */
 class FileTransferFTPWrapper extends FileTransfer {
+
+  public function __construct($jail, $username, $password, $hostname, $port) {
+    $this->username = $username;
+    $this->password = $password;
+    $this->hostname = $hostname;
+    $this->port = $port;
+    parent::__construct($jail);
+  }
+  
   function connect() {
     $this->connection = 'ftp://' . urlencode($this->username) . ':' . urlencode($this->password) . '@' . $this->hostname . ':' . $this->port . '/';
     if (!is_dir($this->connection)) {
@@ -19,29 +28,29 @@ static function factory($jail, $settings) {
   }
 
   function createDirectoryJailed($directory) {
-    if (!@drupal_mkdir($directory)) {
+    if (!@drupal_mkdir($this->connection . $directory)) {
       $exception = new FileTransferException('Cannot create directory @directory.', NULL, array('@directory' => $directory));
       throw $exception;
     }
   }
 
   function removeDirectoryJailed($directory) {
-    if (is_dir($directory)) {
-      $dh = opendir($directory);
+    if (is_dir($this->connection . $directory)) {
+      $dh = opendir($this->connection . $directory);
       while (($resource = readdir($dh)) !== FALSE) {
         if ($resource == '.' || $resource == '..') {
           continue;
         }
         $full_path = $directory . DIRECTORY_SEPARATOR . $resource;
-        if (is_file($full_path)) {
+        if (is_file($this->connection . $full_path)) {
           $this->removeFile($full_path);
         }
-        elseif (is_dir($full_path)) {
+        elseif (is_dir($this->connection . $full_path)) {
           $this->removeDirectory($full_path . '/');
         }
       }
       closedir($dh);
-      if (!rmdir($directory)) {
+      if (!rmdir($this->connection . $directory)) {
         $exception = new FileTransferException('Cannot remove @directory.', NULL, array('@directory' => $directory));
         throw $exception;
       }
@@ -70,15 +79,18 @@ public function isFile($path) {
   }
 
   /**
-   * This is impossible with the stream wrapper,
-   * So we cheat and use the other implementation
+   * This is impossible with the stream wrapper, so an exception is thrown.
+   *
+   * If the ftp extenstion is available, we will cheat and use it.
    *
-   * @staticvar FileTransferFTPExtension $ftp_ext_file_transfer
    * @param string $path
    * @param long $mode
    * @param bool $recursive
    */
   function chmodJailed($path, $mode, $recursive) {
+    if (!function_exists('ftp_connect')) {
+      throw new FileTransferException('Unable to set permissions on @path.  Change umask settings on server to be world executable.', array('@path' => $path));
+    }
     static $ftp_ext_file_transfer;
 
     if (!$ftp_ext_file_transfer) {

includes/theme.maintenance.inc

@@ -202,3 +202,48 @@ function theme_update_page($variables) {
 
   return theme_render_template('themes/garland/maintenance-page.tpl.php', $variables);
 }
+
+/**
+ * Generate a report of the results from an operation run via authorize.php.
+ *
+ * @param array $variables
+ *   - messages: An array of result messages.
+ */
+function theme_authorize_report($variables) {
+  $messages = $variables['messages'];
+  $output = '';
+  if (!empty($messages)) {
+    $output .= '<div id="authorize-results">';
+    foreach ($messages as $heading => $logs) {
+      $output .= '<h3>' . check_plain($heading) . '</h3>';
+      foreach ($logs as $number => $log_message) {
+        if ($number === '#abort') {
+          continue;
+        }
+        $output .= theme('authorize_message', array('message' => $log_message['message'], 'success' => $log_message['success']));
+      }
+    }
+    $output .= '</div>';
+  }
+  return $output;
+}
+
+/**
+ * Render a single log message from the authorize.php batch operation.
+ *
+ * @param $variables
+ *   - message: The log message.
+ *   - success: A boolean indicating failure or success.
+ */
+function theme_authorize_message($variables) {
+  $output = '';
+  $message = $variables['message'];
+  $success = $variables['success'];
+  if ($success) {
+    $output .= '<li class="success">' . $message . '</li>';
+  }
+  else {
+    $output .= '<li class="failure"><strong>' . t('Failed') . ':</strong> ' . $message . '</li>';
+  }
+  return $output;
+}

misc/authorize.js

+// $Id$
+
+/**
+ * @file
+ * Conditionally hide or show the appropriate settings and saved defaults
+ * on the file transfer connection settings form used by authorize.php.
+ */
+
+(function ($) {
+
+Drupal.behaviors.authorizeFileTransferForm = {
+  attach: function(context) {
+    $('#edit-connection-settings-authorize-filetransfer-default').change(function() {
+      $('.filetransfer').hide().filter('.filetransfer-' + $(this).val()).show();
+    });
+    $('.filetransfer').hide().filter('.filetransfer-' + $('#edit-connection-settings-authorize-filetransfer-default').val()).show();
+
+    // Removes the float on the select box (used for non-JS interface)
+    if($('.connection-settings-update-filetransfer-default-wrapper').length > 0) {
+      console.log($('.connection-settings-update-filetransfer-default-wrapper'));
+      $('.connection-settings-update-filetransfer-default-wrapper').css('float', 'none');
+    }
+    // Hides the submit button for non-js users
+    $('#edit-submit-connection').hide();
+    $('#edit-submit-process').show();
+  }
+}
+
+})(jQuery);

modules/system/maintenance.css

@@ -21,3 +21,18 @@
 #update-results li.failure strong {
   color: #b63300;
 }
+
+/* authorize.php styles */
+.connection-settings-update-filetransfer-default-wrapper {
+  float: left;
+}
+#edit-submit-connection {
+  clear: both;
+}
+.filetransfer {
+  display: none;
+  clear: both;
+}
+#edit-connection-settings-change-connection-type {
+  margin: 2.6em 0.5em 0em 1em;
+}

modules/system/system.info

@@ -13,5 +13,6 @@ files[] = system.install
 files[] = system.test
 files[] = system.tar.inc
 files[] = system.tokens.inc
+files[] = system.updater.inc
 files[] = mail.sending.inc
 required = TRUE

modules/system/system.module

@@ -1415,6 +1415,70 @@ function _system_themes_access($theme) {
   return user_access('administer site configuration') && drupal_theme_access($theme);
 }
 
+/**
+ * Invoke a given callback via authorize.php to run with elevated privileges.
+ *
+ * To use authorize.php, certain variables must be stashed into
+ * $_SESSION. This function sets up all the necessary $_SESSION variables,
+ * then redirects to authorize.php to initiate the workflow that will
+ * eventually lead to the callback being invoked. The callback will be invoked
+ * at a low bootstrap level, without all modules being invoked, so it needs to
+ * be careful not to assume any code exists.
+ *
+ * @param $callback
+ *   The name of the function to invoke one the user authorizes the operation.
+ * @param $file
+ *   The full path to the file where the callback function is implemented.
+ * @param $arguments
+ *   Optional array of arguments to pass into the callback when it is invoked.
+ *   Note that the first argument to the callback is always the FileTransfer
+ *   object created by authorize.php when the user authorizes the operation.
+ * @param $page_title
+ *   Optional string to use as the page title once redirected to authorize.php.
+ * @return
+ *   Nothing. This function redirects to authorize.php and does not return.
+ */
+function system_run_authorized($callback, $file, $arguments = array(), $page_title = NULL) {
+  global $base_url;
+
+  // First, figure out what file transfer backends the site supports, and put
+  // all of those in the SESSION so that authorize.php has access to all of
+  // them via the class autoloader, even without a full bootstrap.
+  $_SESSION['authorize_filetransfer_backends'] = module_invoke_all('filetransfer_backends');
+
+  // Now, define the callback to invoke.
+  $_SESSION['authorize_operation'] = array(
+    'callback' => $callback,
+    'file' => $file,
+    'arguments' => $arguments,
+  );
+
+  if (isset($page_title)) {
+    $_SESSION['authorize_operation']['page_title'] = $page_title;
+  }
+
+  // Finally, redirect to authorize.php.
+  drupal_goto($base_url . '/authorize.php');
+}
+
+/**
+ * Implement hook_updater_info().
+ */
+function system_updater_info() {
+  return array(
+    'module' => array(
+      'class' => 'ModuleUpdater',
+      'name' => t('Update modules'),
+      'weight' => 0,
+    ),
+    'theme' => array(
+      'class' => 'ThemeUpdater',
+      'name' => t('Update themes'),
+      'weight' => 0,
+    ),