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<?php
// $Id: actions.inc,v 1.8 2007/12/31 14:51:04 goba Exp $
/**
* @file
* This is the actions engine for executing stored actions.
*/
/**
* Perform a given list of actions by executing their callback functions.
*
* Given the IDs of actions to perform, find out what the callbacks
* for the actions are by querying the database. Then call each callback
* using the function call $function($object, $context, $a1, $2)
* where $function is the name of a function written in compliance with
* the action specification; that is, foo($object, $context).
*
* @param $action_ids
* The ID of the action to perform. Can be a single action ID or an array
* of IDs. IDs of instances will be numeric; IDs of singletons will be
* function names.
* @param $object
* Parameter that will be passed along to the callback. Typically the
* object that the action will act on; a node, user or comment object.
* If the action does not act on an object, pass a dummy object. This
* is necessary to support PHP 4 object referencing.
* @param $context
* Parameter that will be passed along to the callback. $context is a
* keyed array containing extra information about what is currently
* happening at the time of the call. Typically $context['hook'] and
* $context['op'] will tell which hook-op combination resulted in this
* call to actions_do().
* @param $a1
* Parameter that will be passed along to the callback.
* @param $a2
* Parameter that will be passed along to the callback.
*
* @return
* An associative array containing the result of the function that
* performs the action, keyed on action ID.
*/
function actions_do($action_ids, &$object, $context = NULL, $a1 = NULL, $a2 = NULL) {
static $stack;
$stack++;
if ($stack > variable_get('actions_max_stack', 35)) {
watchdog('actions', 'Stack overflow: too many calls to actions_do(). Aborting to prevent infinite recursion.', WATCHDOG_ERROR);
return;
}
$actions = array();
$available_actions = actions_list();
$result = array();
if (is_array($action_ids)) {
$where = array();
$where_values = array();
foreach ($action_ids as $action_id) {
if (is_numeric($action_id)) {
$where[] = 'OR aid = %d';
$where_values[] = $action_id;
}
elseif (isset($available_actions[$action_id])) {
$actions[$action_id] = $available_actions[$action_id];
}
}
// When we have action instances we must go to the database to
// retrieve instance data.
if ($where) {
$where_clause = implode(' ', $where);
// Strip off leading 'OR '.
$where_clause = '('. strstr($where_clause, " ") .')';
$result_db = db_query('SELECT * FROM {actions} WHERE '. $where_clause, $where_values);
while ($action = db_fetch_object($result_db)) {
$actions[$action->aid] = $action->parameters ? unserialize($action->parameters) : array();
$actions[$action->aid]['callback'] = $action->callback;
$actions[$action->aid]['type'] = $action->type;
}
}
// Fire actions, in no particular order.
foreach ($actions as $action_id => $params) {
if (is_numeric($action_id)) { // Configurable actions need parameters.
$function = $params['callback'];
$context = array_merge($context, $params);
$result[$action_id] = $function($object, $context, $a1, $a2);
}
// Singleton action; $action_id is the function name.
else {
$result[$action_id] = $action_id($object, $context, $a1, $a2);
}
}
}
// Optimized execution of single action.
else {
// If it's a configurable action, retrieve stored parameters.
if (is_numeric($action_ids)) {
$action = db_fetch_object(db_query("SELECT * FROM {actions} WHERE aid = %d", $action_ids));
$function = $action->callback;
$context = array_merge($context, unserialize($action->parameters));
$result[$action_ids] = $function($object, $context, $a1, $a2);
}
// Singleton action; $action_ids is the function name.
else {
$result[$action_ids] = $action_ids($object, $context, $a1, $a2);
}
}
return $result;
}
/**
* Discover all action functions by invoking hook_action_info().
*
* mymodule_action_info() {
* return array(
* 'mymodule_functiondescription_action' => array(
* 'type' => 'node',
* 'description' => t('Save node'),
* 'configurable' => FALSE,
* 'hooks' => array(
* 'nodeapi' => array('delete', 'insert', 'update', 'view'),
* 'comment' => array('delete', 'insert', 'update', 'view'),
* )
* )
* );
* }
*
* The description is used in presenting possible actions to the user for
* configuration. The type is used to present these actions in a logical
* grouping and to denote context. Some types are 'node', 'user', 'comment',
* and 'system'. If an action is configurable it will provide form,
* validation and submission functions. The hooks the action supports
* are declared in the 'hooks' array.
*
* @param $reset
* Reset the action info static cache.
*
* @return
* An associative array keyed on function name. The value of each key is
* an array containing information about the action, such as type of
* action and description of the action, e.g.,
*
* @code
* $actions['node_publish_action'] = array(
* 'type' => 'node',
* 'description' => t('Publish post'),
* 'configurable' => FALSE,
* 'hooks' => array(
* 'nodeapi' => array('presave', 'insert', 'update', 'view'),
* 'comment' => array('delete', 'insert', 'update', 'view'),
* ),
* );
* @endcode
*/
function actions_list($reset = FALSE) {
static $actions;
if (!isset($actions) || $reset) {
$actions = module_invoke_all('action_info');
drupal_alter('action_info', $actions);
}
// See module_implements for explanations of this cast.
return (array)$actions;
}
/**
* Retrieve all action instances from the database.
*
* Compare with actions_list() which gathers actions by
* invoking hook_action_info(). The two are synchronized
* by visiting /admin/build/actions (when actions.module is
* enabled) which runs actions_synchronize().
*
* @return
* Associative array keyed by action ID. Each value is
* an associative array with keys 'callback', 'description',
* 'type' and 'configurable'.
*/
function actions_get_all_actions() {
$actions = array();
$result = db_query("SELECT * FROM {actions}");
while ($action = db_fetch_object($result)) {
$actions[$action->aid] = array(
'callback' => $action->callback,
'description' => $action->description,
'type' => $action->type,
'configurable' => (bool) $action->parameters,
);
}
return $actions;
}
/**
* Create an associative array keyed by md5 hashes of function names.
*
* Hashes are used to prevent actual function names from going out into
* HTML forms and coming back.
*
* @param $actions
* An associative array with function names as keys and associative
* arrays with keys 'description', 'type', etc. as values. Generally
* the output of actions_list() or actions_get_all_actions() is given
* as input to this function.
*
* @return
* An associative array keyed on md5 hash of function name. The value of
* each key is an associative array of function, description, and type
* for the action.
*/
function actions_actions_map($actions) {
$actions_map = array();
foreach ($actions as $callback => $array) {
$key = md5($callback);
$actions_map[$key]['callback'] = isset($array['callback']) ? $array['callback'] : $callback;
$actions_map[$key]['description'] = $array['description'];
$actions_map[$key]['type'] = $array['type'];
$actions_map[$key]['configurable'] = $array['configurable'];
}
return $actions_map;
}
/**
* Given an md5 hash of a function name, return the function name.
*
* Faster than actions_actions_map() when you only need the function name.
*
* @param $hash
* MD5 hash of a function name
*
* @return
* Function name
*/
function actions_function_lookup($hash) {
$actions_list = actions_list();
foreach ($actions_list as $function => $array) {
if (md5($function) == $hash) {
return $function;
}
}
// Must be an instance; must check database.
$aid = db_result(db_query("SELECT aid FROM {actions} WHERE MD5(aid) = '%s' AND parameters != ''", $hash));
return $aid;
}
/**
* Synchronize actions that are provided by modules.
*
* They are synchronized with actions that are stored in the actions table.
* This is necessary so that actions that do not require configuration can
* receive action IDs. This is not necessarily the best approach,
* but it is the most straightforward.
*/
function actions_synchronize($actions_in_code = array(), $delete_orphans = FALSE) {
if (!$actions_in_code) {
$actions_in_code = actions_list();
}
$actions_in_db = array();
$result = db_query("SELECT * FROM {actions} WHERE parameters = ''");
while ($action = db_fetch_object($result)) {
$actions_in_db[$action->callback] = array('aid' => $action->aid, 'description' => $action->description);
}
// Go through all the actions provided by modules.
foreach ($actions_in_code as $callback => $array) {
// Ignore configurable actions since their instances get put in
// when the user adds the action.
if (!$array['configurable']) {
// If we already have an action ID for this action, no need to assign aid.
if (array_key_exists($callback, $actions_in_db)) {
unset($actions_in_db[$callback]);
}
else {
// This is a new singleton that we don't have an aid for; assign one.
db_query("INSERT INTO {actions} (aid, type, callback, parameters, description) VALUES ('%s', '%s', '%s', '%s', '%s')", $callback, $array['type'], $callback, '', $array['description']);
watchdog('actions', "Action '%action' added.", array('%action' => filter_xss_admin($array['description'])));
}
}
}
// Any actions that we have left in $actions_in_db are orphaned.
if ($actions_in_db) {
$orphaned = array();
$placeholder = array();
foreach ($actions_in_db as $callback => $array) {
$orphaned[] = $callback;
$placeholder[] = "'%s'";
}
$orphans = implode(', ', $orphaned);
if ($delete_orphans) {
$placeholders = implode(', ', $placeholder);
$results = db_query("SELECT a.aid, a.description FROM {actions} a WHERE callback IN ($placeholders)", $orphaned);
while ($action = db_fetch_object($results)) {
actions_delete($action->aid);
watchdog('actions', "Removed orphaned action '%action' from database.", array('%action' => filter_xss_admin($action->description)));
}
}
else {
$link = l(t('Remove orphaned actions'), 'admin/build/actions/orphan');
$count = count($actions_in_db);
watchdog('actions', format_plural($count, 'One orphaned action (%orphans) exists in the actions table. !link', '@count orphaned actions (%orphans) exist in the actions table. !link', array('@count' => $count, '%orphans' => $orphans, '!link' => $link), 'warning'));
}
}
}
/**
* Save an action and its associated user-supplied parameter values to the database.
*
* @param $function
* The name of the function to be called when this action is performed.
* @param $params
* An associative array with parameter names as keys and parameter values
* as values.
* @param $desc
* A user-supplied description of this particular action, e.g., 'Send
* e-mail to Jim'.
* @param $aid
* The ID of this action. If omitted, a new action is created.
*
* @return
* The ID of the action.
*/
function actions_save($function, $type, $params, $desc, $aid = NULL) {
$serialized = serialize($params);
if ($aid) {
db_query("UPDATE {actions} SET callback = '%s', type = '%s', parameters = '%s', description = '%s' WHERE aid = %d", $function, $type, $serialized, $desc, $aid);
watchdog('actions', 'Action %action saved.', array('%action' => $desc));
}
else {
// aid is the callback for singleton actions so we need to keep a
// separate table for numeric aids.
db_query('INSERT INTO {actions_aid} VALUES (default)');
$aid = db_last_insert_id('actions_aid', 'aid');
db_query("INSERT INTO {actions} (aid, callback, type, parameters, description) VALUES (%d, '%s', '%s', '%s', '%s')", $aid, $function, $type, $serialized, $desc);
watchdog('actions', 'Action %action created.', array('%action' => $desc));
}
return $aid;
}
/**
* Retrieve a single action from the database.
*
* @param $aid
* integer The ID of the action to retrieve.
*
* @return
* The appropriate action row from the database as an object.
*/
function actions_load($aid) {
return db_fetch_object(db_query("SELECT * FROM {actions} WHERE aid = %d", $aid));
}
/**
* Delete a single action from the database.
*
* @param $aid
* integer The ID of the action to delete.
*/
function actions_delete($aid) {
db_query("DELETE FROM {actions} WHERE aid = %d", $aid);
module_invoke_all('actions_delete', $aid);
}
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