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root / drupal7 / includes / actions.inc @ a8cee257

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<?php
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/**
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 * @file
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 * This is the actions engine for executing stored actions.
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 */
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/**
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 * @defgroup actions Actions
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 * @{
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 * Functions that perform an action on a certain system object.
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 *
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 * Action functions are declared by modules by implementing hook_action_info().
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 * Modules can cause action functions to run by calling actions_do(), and
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 * trigger.module provides a user interface that lets administrators define
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 * events that cause action functions to run.
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 *
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 * Each action function takes two to four arguments:
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 * - $entity: The object that the action acts on, such as a node, comment, or
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 *   user.
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 * - $context: Array of additional information about what triggered the action.
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 * - $a1, $a2: Optional additional information, which can be passed into
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 *   actions_do() and will be passed along to the action function.
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 *
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 * @}
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 */
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/**
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 * Performs a given list of actions by executing their callback functions.
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 *
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 * Given the IDs of actions to perform, this function finds out what the
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 * callback functions for the actions are by querying the database. Then
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 * it calls each callback using the function call $function($object, $context,
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 * $a1, $a2), passing the input arguments of this function (see below) to the
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 * action function.
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 *
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 * @param $action_ids
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 *   The IDs of the actions to perform. Can be a single action ID or an array
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 *   of IDs. IDs of configurable actions must be given as numeric action IDs;
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 *   IDs of non-configurable actions may be given as action function names.
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 * @param $object
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 *   The object that the action will act on: a node, user, or comment object.
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 * @param $context
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 *   Associative array containing extra information about what triggered
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 *   the action call, with $context['hook'] giving the name of the hook
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 *   that resulted in this call to actions_do().
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 * @param $a1
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 *   Passed along to the callback.
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 * @param $a2
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 *   Passed along to the callback.
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 *
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 * @return
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 *   An associative array containing the results of the functions that
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 *   perform the actions, keyed on action ID.
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 *
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 * @ingroup actions
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 */
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function actions_do($action_ids, $object = NULL, $context = NULL, $a1 = NULL, $a2 = NULL) {
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  // $stack tracks the number of recursive calls.
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  static $stack;
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  $stack++;
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  if ($stack > variable_get('actions_max_stack', 35)) {
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    watchdog('actions', 'Stack overflow: too many calls to actions_do(). Aborting to prevent infinite recursion.', array(), WATCHDOG_ERROR);
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    return;
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  }
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  $actions = array();
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  $available_actions = actions_list();
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  $actions_result = array();
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  if (is_array($action_ids)) {
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    $conditions = array();
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    foreach ($action_ids as $action_id) {
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      if (is_numeric($action_id)) {
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        $conditions[] = $action_id;
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      }
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      elseif (isset($available_actions[$action_id])) {
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        $actions[$action_id] = $available_actions[$action_id];
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      }
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    }
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    // When we have action instances we must go to the database to retrieve
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    // instance data.
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    if (!empty($conditions)) {
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      $query = db_select('actions');
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      $query->addField('actions', 'aid');
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      $query->addField('actions', 'type');
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      $query->addField('actions', 'callback');
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      $query->addField('actions', 'parameters');
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      $query->condition('aid', $conditions, 'IN');
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      $result = $query->execute();
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      foreach ($result as $action) {
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        $actions[$action->aid] = $action->parameters ? unserialize($action->parameters) : array();
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        $actions[$action->aid]['callback'] = $action->callback;
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        $actions[$action->aid]['type'] = $action->type;
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      }
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    }
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    // Fire actions, in no particular order.
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    foreach ($actions as $action_id => $params) {
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      // Configurable actions need parameters.
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      if (is_numeric($action_id)) {
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        $function = $params['callback'];
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        if (function_exists($function)) {
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          $context = array_merge($context, $params);
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          $actions_result[$action_id] = $function($object, $context, $a1, $a2);
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        }
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        else {
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          $actions_result[$action_id] = FALSE;
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        }
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      }
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      // Singleton action; $action_id is the function name.
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      else {
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        $actions_result[$action_id] = $action_id($object, $context, $a1, $a2);
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      }
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    }
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  }
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  // Optimized execution of a single action.
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  else {
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    // If it's a configurable action, retrieve stored parameters.
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    if (is_numeric($action_ids)) {
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      $action = db_query("SELECT callback, parameters FROM {actions} WHERE aid = :aid", array(':aid' => $action_ids))->fetchObject();
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      $function = $action->callback;
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      if (function_exists($function)) {
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        $context = array_merge($context, unserialize($action->parameters));
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        $actions_result[$action_ids] = $function($object, $context, $a1, $a2);
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      }
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      else {
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        $actions_result[$action_ids] = FALSE;
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      }
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    }
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    // Singleton action; $action_ids is the function name.
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    else {
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      if (function_exists($action_ids)) {
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        $actions_result[$action_ids] = $action_ids($object, $context, $a1, $a2);
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      }
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      else {
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        // Set to avoid undefined index error messages later.
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        $actions_result[$action_ids] = FALSE;
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      }
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    }
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  }
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  $stack--;
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  return $actions_result;
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}
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/**
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 * Discovers all available actions by invoking hook_action_info().
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 *
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 * This function contrasts with actions_get_all_actions(); see the
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 * documentation of actions_get_all_actions() for an explanation.
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 *
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 * @param $reset
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 *   Reset the action info static cache.
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 *
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 * @return
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 *   An associative array keyed on action function name, with the same format
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 *   as the return value of hook_action_info(), containing all
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 *   modules' hook_action_info() return values as modified by any
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 *   hook_action_info_alter() implementations.
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 *
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 * @see hook_action_info()
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 */
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function actions_list($reset = FALSE) {
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  $actions = &drupal_static(__FUNCTION__);
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  if (!isset($actions) || $reset) {
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    $actions = module_invoke_all('action_info');
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    drupal_alter('action_info', $actions);
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  }
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  // See module_implements() for an explanation of this cast.
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  return (array) $actions;
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}
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/**
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 * Retrieves all action instances from the database.
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 *
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 * This function differs from the actions_list() function, which gathers
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 * actions by invoking hook_action_info(). The actions returned by this
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 * function and the actions returned by actions_list() are partially
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 * synchronized. Non-configurable actions from hook_action_info()
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 * implementations are put into the database when actions_synchronize() is
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 * called, which happens when admin/config/system/actions is visited.
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 * Configurable actions are not added to the database until they are configured
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 * in the user interface, in which case a database row is created for each
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 * configuration of each action.
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 *
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 * @return
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 *   Associative array keyed by numeric action ID. Each value is an associative
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 *   array with keys 'callback', 'label', 'type' and 'configurable'.
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 */
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function actions_get_all_actions() {
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  $actions = db_query("SELECT aid, type, callback, parameters, label FROM {actions}")->fetchAllAssoc('aid', PDO::FETCH_ASSOC);
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  foreach ($actions as &$action) {
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    $action['configurable'] = (bool) $action['parameters'];
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    unset($action['parameters']);
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    unset($action['aid']);
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  }
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  return $actions;
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}
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/**
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 * Creates an associative array keyed by hashes of function names or IDs.
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 *
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 * Hashes are used to prevent actual function names from going out into HTML
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 * forms and coming back.
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 *
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 * @param $actions
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 *   An associative array with function names or action IDs as keys
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 *   and associative arrays with keys 'label', 'type', etc. as values.
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 *   This is usually the output of actions_list() or actions_get_all_actions().
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 *
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 * @return
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 *   An associative array whose keys are hashes of the input array keys, and
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 *   whose corresponding values are associative arrays with components
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 *   'callback', 'label', 'type', and 'configurable' from the input array.
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 */
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function actions_actions_map($actions) {
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  $actions_map = array();
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  foreach ($actions as $callback => $array) {
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    $key = drupal_hash_base64($callback);
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    $actions_map[$key]['callback']     = isset($array['callback']) ? $array['callback'] : $callback;
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    $actions_map[$key]['label']        = $array['label'];
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    $actions_map[$key]['type']         = $array['type'];
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    $actions_map[$key]['configurable'] = $array['configurable'];
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  }
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  return $actions_map;
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}
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/**
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 * Returns an action array key (function or ID), given its hash.
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 *
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 * Faster than actions_actions_map() when you only need the function name or ID.
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 *
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 * @param $hash
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 *   Hash of a function name or action ID array key. The array key
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 *   is a key into the return value of actions_list() (array key is the action
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 *   function name) or actions_get_all_actions() (array key is the action ID).
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 *
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 * @return
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 *   The corresponding array key, or FALSE if no match is found.
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 */
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function actions_function_lookup($hash) {
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  // Check for a function name match.
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  $actions_list = actions_list();
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  foreach ($actions_list as $function => $array) {
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    if (drupal_hash_base64($function) == $hash) {
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      return $function;
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    }
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  }
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  $aid = FALSE;
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  // Must be a configurable action; check database.
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  $result = db_query("SELECT aid FROM {actions} WHERE parameters <> ''")->fetchAll(PDO::FETCH_ASSOC);
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  foreach ($result as $row) {
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    if (drupal_hash_base64($row['aid']) == $hash) {
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      $aid = $row['aid'];
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      break;
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    }
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  }
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  return $aid;
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}
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/**
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 * Synchronizes actions that are provided by modules in hook_action_info().
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 *
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 * Actions provided by modules in hook_action_info() implementations are
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 * synchronized with actions that are stored in the actions database table.
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 * This is necessary so that actions that do not require configuration can
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 * receive action IDs.
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 *
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 * @param $delete_orphans
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 *   If TRUE, any actions that exist in the database but are no longer
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 *   found in the code (for example, because the module that provides them has
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 *   been disabled) will be deleted.
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 */
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function actions_synchronize($delete_orphans = FALSE) {
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  $actions_in_code = actions_list(TRUE);
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  $actions_in_db = db_query("SELECT aid, callback, label FROM {actions} WHERE parameters = ''")->fetchAllAssoc('callback', PDO::FETCH_ASSOC);
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  // Go through all the actions provided by modules.
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  foreach ($actions_in_code as $callback => $array) {
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    // Ignore configurable actions since their instances get put in when the
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    // user adds the action.
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    if (!$array['configurable']) {
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      // If we already have an action ID for this action, no need to assign aid.
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      if (isset($actions_in_db[$callback])) {
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        unset($actions_in_db[$callback]);
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      }
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      else {
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        // This is a new singleton that we don't have an aid for; assign one.
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        db_insert('actions')
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          ->fields(array(
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            'aid' => $callback,
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            'type' => $array['type'],
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            'callback' => $callback,
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            'parameters' => '',
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            'label' => $array['label'],
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            ))
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          ->execute();
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        watchdog('actions', "Action '%action' added.", array('%action' => $array['label']));
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      }
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    }
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  }
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  // Any actions that we have left in $actions_in_db are orphaned.
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  if ($actions_in_db) {
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    $orphaned = array_keys($actions_in_db);
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    if ($delete_orphans) {
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      $actions = db_query('SELECT aid, label FROM {actions} WHERE callback IN (:orphaned)', array(':orphaned' => $orphaned))->fetchAll();
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      foreach ($actions as $action) {
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        actions_delete($action->aid);
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        watchdog('actions', "Removed orphaned action '%action' from database.", array('%action' => $action->label));
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      }
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    }
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    else {
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      $link = l(t('Remove orphaned actions'), 'admin/config/system/actions/orphan');
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      $count = count($actions_in_db);
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      $orphans = implode(', ', $orphaned);
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      watchdog('actions', '@count orphaned actions (%orphans) exist in the actions table. !link', array('@count' => $count, '%orphans' => $orphans, '!link' => $link), WATCHDOG_INFO);
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    }
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  }
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}
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/**
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 * Saves an action and its user-supplied parameter values to the database.
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 *
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 * @param $function
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 *   The name of the function to be called when this action is performed.
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 * @param $type
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 *   The type of action, to describe grouping and/or context, e.g., 'node',
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 *   'user', 'comment', or 'system'.
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 * @param $params
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 *   An associative array with parameter names as keys and parameter values as
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 *   values.
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 * @param $label
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 *   A user-supplied label of this particular action, e.g., 'Send e-mail
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 *   to Jim'.
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 * @param $aid
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 *   The ID of this action. If omitted, a new action is created.
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 *
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 * @return
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 *   The ID of the action.
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 */
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function actions_save($function, $type, $params, $label, $aid = NULL) {
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  // aid is the callback for singleton actions so we need to keep a separate
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  // table for numeric aids.
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  if (!$aid) {
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    $aid = db_next_id();
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  }
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  db_merge('actions')
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    ->key(array('aid' => $aid))
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    ->fields(array(
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      'callback' => $function,
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      'type' => $type,
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      'parameters' => serialize($params),
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      'label' => $label,
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    ))
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    ->execute();
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  watchdog('actions', 'Action %action saved.', array('%action' => $label));
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  return $aid;
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}
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/**
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 * Retrieves a single action from the database.
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 *
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 * @param $aid
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 *   The ID of the action to retrieve.
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 *
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 * @return
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 *   The appropriate action row from the database as an object.
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 */
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function actions_load($aid) {
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  return db_query("SELECT aid, type, callback, parameters, label FROM {actions} WHERE aid = :aid", array(':aid' => $aid))->fetchObject();
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}
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/**
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 * Deletes a single action from the database.
379
 *
380
 * @param $aid
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 *   The ID of the action to delete.
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 */
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function actions_delete($aid) {
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  db_delete('actions')
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    ->condition('aid', $aid)
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    ->execute();
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  module_invoke_all('actions_delete', $aid);
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}