228 lines
7.8 KiB
PHP
228 lines
7.8 KiB
PHP
<?php
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// $Id$
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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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* Given the IDs of actions to perform, find out what the callbacks
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* for the actions are by querying the database. Then call each callback
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* using the function call $function('do', $object, $context, $a1, $2)
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* where $function is the name of a function written in compliance with
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* the action specification; that is, foo($object, $context). The $params
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* parameter is an array of stored parameters that have been previously
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* configured through the web using actions.module.
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*
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* @param $action_ids
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* The ID of the action to perform. Can be a single action ID or an array
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* of IDs. IDs of instances will be numeric; IDs of singletons will be
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* function names.
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* @param $object
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* Parameter that will be passed along to the callback. Typically the
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* object that the action will act on; a node, user or comment object.
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* @param $context
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* Parameter that will be passed along to the callback. $context is a
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* keyed array containing extra information about what is currently
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* happening at the time of the call. Typically $context['hook'] and
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* $context['op'] will tell which hook-op combination resulted in this
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* call to actions_do().
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* @param $a1
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* Parameter that will be passed along to the callback.
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* @param $a2
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* Parameter that will be passed along to the callback.
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*
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* @return
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* An associative array containing the result of the function that
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* performs the action, keyed on action ID.
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*/
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function actions_do($action_ids, $object = NULL, $context = NULL, $a1 = NULL, $a2 = NULL) {
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static $stack;
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$stack++;
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if ($stack > variable_get('actions_max_stack', 35)) {
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watchdog('actions', 'Stack overflow: too many calls to actions_do(). Aborting to prevent infinite recursion.', WATCHDOG_ERROR);
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return;
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}
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$actions = array();
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$available_actions = actions_list();
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$result = array();
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if (is_array($action_ids)) {
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$where = array();
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$where_values = array();
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foreach ($action_ids as $action_id) {
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if (is_numeric($action_id)) {
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$where[] = 'OR aid = %d';
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$where_values[] = $action_id;
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}
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elseif (isset($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
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// retrieve instance data.
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if ($where) {
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$where_clause = implode(' ', $where);
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// Strip off leading 'OR '.
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$where_clause = '('. strstr($where_clause, " ") .')';
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$result_db = db_query('SELECT * FROM {actions} WHERE '. $where_clause, $where_values);
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while ($action = db_fetch_object($result_db)) {
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$action_id = $action->action_id;
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$actions[$action_id] = $action->params ? unserialize($data->parameters) : array();
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$actions[$action_id]['callback'] = $action->callback;
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$actions[$action_id]['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 => $params) {
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if (is_numeric($action_id)) { // Configurable actions need parameters.
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$function = $params['callback'];
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$context = array_merge($context, $params);
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$result[$action_id] = $function($object, $context, $a1, $a2);
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}
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// Singleton action; $action_id is the function name.
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else {
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$result[$action_id] = $action_id($object, $context, $a1, $a2);
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}
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}
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}
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// Optimized execution of single action.
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else {
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// If it's a configurable action, retrieve stored parameters.
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if (is_numeric($action_ids)) {
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$action = db_fetch_object(db_query("SELECT * FROM {actions} WHERE aid = %d", $action_ids));
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$function = $action->callback;
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$context = array_merge($context, unserialize($action->parameters));
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$result[$action_ids] = $function($object, $context, $a1, $a2);
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}
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// Singleton action; $action_ids is the function name.
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else {
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$result[$action_ids] = $action_ids($object, $context, $a1, $a2);
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}
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}
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return $result;
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}
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/**
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* Discover all action functions by invoking hook_action_info().
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*
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* mymodule_action_info() {
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* return array(
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* 'mymodule_functiondescription_action' => array(
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* 'type' => 'node',
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* 'description' => t('Save node'),
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* 'configurable' => FALSE,
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* 'hooks' => array(
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* 'nodeapi' => array('delete','insert','update', 'view'),
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* 'comment' => array('delete','insert','update', 'view'),
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* )
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* )
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* );
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* }
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*
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* The description is used in presenting possible actions to the user for
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* configuration. The type is used to present these actions in a logical
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* grouping and to denote context. Some types are 'node', 'user', 'comment',
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* and 'system'. If an action is configurable it will provide form,
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* validation and submission functions. The hooks the action supports
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* are declared in the 'hooks' array.
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*
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* @return
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* An associative array keyed on function name. The value of each key is
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* an array containing information about the action, such as type of
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* action and description of the action, e.g.,
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*
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* $actions['actions_node_publish'] = ('description' => 'Publish a node' ... )
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*/
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function actions_list() {
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static $actions;
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if (isset($actions)) {
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return $actions;
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}
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$actions = module_invoke_all('action_info');
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drupal_alter('action_info', $actions);
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return $actions;
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}
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/**
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* Retrieve all action instances from the database.
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* Compare with actions_list() which gathers actions by
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* invoking hook_action_info(). The two are synchronized
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* by visiting /admin/build/actions (when actions.module is
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* enabled) which runs actions_synchronize().
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*
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* @return
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* Associative array keyed by action ID. Each value is
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* an associative array with keys 'callback', 'description',
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* 'type' and 'configurable'.
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*/
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function actions_get_all_actions() {
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$actions = array();
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$result = db_query("SELECT * FROM {actions}");
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while ($action = db_fetch_object($result)) {
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$actions[$action->aid] = array(
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'callback' => $action->callback,
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'description' => $action->description,
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'type' => $action->type,
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'configurable' => (bool) $action->parameters,
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);
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}
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return $actions;
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}
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/**
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* Create an associative array keyed by md5 hashes of function names.
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* Hashes are used to prevent actual function names from going out into
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* HTML forms and coming back.
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*
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* @param $actions
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* An associative array with function names as keys and associative
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* arrays with keys 'description', 'type', etc. as values. Generally
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* the output of actions_list() or actions_get_all_actions() is given
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* as input to this function.
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*
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* @return
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* An associative array keyed on md5 hash of function name. The value of
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* each key is an associative array of function, description, and type
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* for the action.
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*/
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function actions_actions_map($actions) {
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$actions_map = array();
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foreach ($actions as $callback => $array) {
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$key = md5($callback);
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$actions_map[$key]['callback'] = isset($array['callback']) ? $array['callback'] : $callback;
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$actions_map[$key]['description'] = $array['description'];
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$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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* Given an md5 hash of a function name, return the function name.
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* Faster than actions_actions_map() when you only need the function name.
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*
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* @param $hash
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* MD5 hash of a function name
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*
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* @return
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* Function name
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*/
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function actions_function_lookup($hash) {
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$actions_list = actions_list();
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foreach ($actions_list as $function => $array) {
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if (md5($function) == $hash) {
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return $function;
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}
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}
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// Must be an instance; must check database.
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$aid = db_result(db_query("SELECT aid FROM {actions} WHERE MD5(aid) = '%s' AND parameters != ''", $hash));
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return $aid;
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}
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