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module.php
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module.php
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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* This is the API for handling modules.
*
* Note: by design, this class does not do any permission checking.
*/
class module_Core {
public static $active = array();
public static $modules = array();
public static $var_cache = null;
public static $available = array();
/**
* Set the version of the corresponding Module_Model
* @param string $module_name
* @param integer $version
*/
static function set_version($module_name, $version) {
$module = module::get($module_name);
if (!$module->loaded()) {
$module->name = $module_name;
$module->active = $module_name == "gallery"; // only gallery is active by default
}
$module->version = $version;
$module->save();
Kohana_Log::add("debug", "$module_name: version is now $version");
}
/**
* Load the corresponding Module_Model
* @param string $module_name
*/
static function get($module_name) {
if (empty(self::$modules[$module_name])) {
return ORM::factory("module")->where("name", "=", $module_name)->find();
}
return self::$modules[$module_name];
}
/**
* Get the information about a module
* @returns ArrayObject containing the module information from the module.info file or false if
* not found
*/
static function info($module_name) {
$module_list = module::available();
return isset($module_list->$module_name) ? $module_list->$module_name : false;
}
/**
* Check to see if a module is installed
* @param string $module_name
*/
static function is_installed($module_name) {
return array_key_exists($module_name, self::$modules);
}
/**
* Check to see if a module is active
* @param string $module_name
*/
static function is_active($module_name) {
return array_key_exists($module_name, self::$modules) &&
self::$modules[$module_name]->active;
}
/**
* Return the list of available modules, including uninstalled modules.
*/
static function available() {
if (empty(self::$available)) {
$modules = new ArrayObject(array(), ArrayObject::ARRAY_AS_PROPS);
foreach (glob(MODPATH . "*/module.info") as $file) {
$module_name = basename(dirname($file));
$modules->$module_name =
new ArrayObject(parse_ini_file($file), ArrayObject::ARRAY_AS_PROPS);
foreach ($modules->$module_name as &$value) {
$value = html::purify($value);
}
$m =& $modules->$module_name;
$m->installed = module::is_installed($module_name);
$m->active = module::is_active($module_name);
$m->code_version = $m->version;
$m->version = module::get_version($module_name);
$m->locked = false;
if ($m->active && $m->version != $m->code_version) {
site_status::warning(t("Some of your modules are out of date. <a href=\"%upgrader_url\">Upgrade now!</a>", array("upgrader_url" => url::abs_site("upgrader"))), "upgrade_now");
}
}
// Lock certain modules
$modules->gallery->locked = true;
$identity_module = module::get_var("gallery", "identity_provider", "user");
$modules->$identity_module->locked = true;
$modules->uasort(array("module", "module_comparator"));
self::$available = $modules;
}
return self::$available;
}
/**
* Natural name sort comparator
*/
static function module_comparator($a, $b) {
return strnatcasecmp($a->name, $b->name);
}
/**
* Return a list of all the active modules in no particular order.
*/
static function active() {
return self::$active;
}
/**
* Check that the module can be activated. (i.e. all the prerequistes exist)
* @param string $module_name
* @return array an array of warning or error messages to be displayed
*/
static function can_activate($module_name) {
module::_add_to_path($module_name);
$messages = array();
$installer_class = "{$module_name}_installer";
if (class_exists($installer_class) && method_exists($installer_class, "can_activate")) {
$messages = call_user_func(array($installer_class, "can_activate"));
}
// Remove it from the active path
module::_remove_from_path($module_name);
return $messages;
}
/**
* Allow modules to indicate the impact of deactivating the specified module
* @param string $module_name
* @return array an array of warning or error messages to be displayed
*/
static function can_deactivate($module_name) {
$data = (object)array("module" => $module_name, "messages" => array());
module::event("pre_deactivate", $data);
return $data->messages;
}
/**
* Install a module. This will call <module>_installer::install(), which is responsible for
* creating database tables, setting module variables and calling module::set_version().
* Note that after installing, the module must be activated before it is available for use.
* @param string $module_name
*/
static function install($module_name) {
module::_add_to_path($module_name);
$installer_class = "{$module_name}_installer";
if (class_exists($installer_class) && method_exists($installer_class, "install")) {
call_user_func_array(array($installer_class, "install"), array());
}
module::set_version($module_name, module::available()->$module_name->code_version);
// Set the weight of the new module, which controls the order in which the modules are
// loaded. By default, new modules are installed at the end of the priority list. Since the
// id field is monotonically increasing, the easiest way to guarantee that is to set the weight
// the same as the id. We don't know that until we save it for the first time
$module = ORM::factory("module")->where("name", "=", $module_name)->find();
if ($module->loaded()) {
$module->weight = $module->id;
$module->save();
}
module::load_modules();
// Now the module is installed but inactive, so don't leave it in the active path
module::_remove_from_path($module_name);
log::success(
"module", t("Installed module %module_name", array("module_name" => $module_name)));
}
private static function _add_to_path($module_name) {
$config = Kohana_Config::instance();
$kohana_modules = $config->get("core.modules");
array_unshift($kohana_modules, MODPATH . $module_name);
$config->set("core.modules", $kohana_modules);
// Rebuild the include path so the module installer can benefit from auto loading
Kohana::include_paths(true);
}
private static function _remove_from_path($module_name) {
$config = Kohana_Config::instance();
$kohana_modules = $config->get("core.modules");
if (($key = array_search(MODPATH . $module_name, $kohana_modules)) !== false) {
unset($kohana_modules[$key]);
$kohana_modules = array_values($kohana_modules); // reindex
}
$config->set("core.modules", $kohana_modules);
Kohana::include_paths(true);
}
/**
* Upgrade a module. This will call <module>_installer::upgrade(), which is responsible for
* modifying database tables, changing module variables and calling module::set_version().
* Note that after upgrading, the module must be activated before it is available for use.
* @param string $module_name
*/
static function upgrade($module_name) {
$version_before = module::get_version($module_name);
$installer_class = "{$module_name}_installer";
$available = module::available();
if (class_exists($installer_class) && method_exists($installer_class, "upgrade")) {
call_user_func_array(array($installer_class, "upgrade"), array($version_before));
} else {
if (isset($available->$module_name->code_version)) {
module::set_version($module_name, $available->$module_name->code_version);
} else {
throw new Exception("@todo UNKNOWN_MODULE");
}
}
module::load_modules();
$version_after = module::get_version($module_name);
if ($version_before != $version_after) {
log::success(
"module", t("Upgraded module %module_name from %version_before to %version_after",
array("module_name" => $module_name,
"version_before" => $version_before,
"version_after" => $version_after)));
}
if ($version_after != $available->$module_name->code_version) {
throw new Exception("@todo MODULE_FAILED_TO_UPGRADE");
}
}
/**
* Activate an installed module. This will call <module>_installer::activate() which should take
* any steps to make sure that the module is ready for use. This will also activate any
* existing graphics rules for this module.
* @param string $module_name
*/
static function activate($module_name) {
module::_add_to_path($module_name);
$installer_class = "{$module_name}_installer";
if (class_exists($installer_class) && method_exists($installer_class, "activate")) {
call_user_func_array(array($installer_class, "activate"), array());
}
$module = module::get($module_name);
if ($module->loaded()) {
$module->active = true;
$module->save();
}
module::load_modules();
graphics::activate_rules($module_name);
block_manager::activate_blocks($module_name);
log::success(
"module", t("Activated module %module_name", array("module_name" => $module_name)));
}
/**
* Deactivate an installed module. This will call <module>_installer::deactivate() which should
* take any cleanup steps to make sure that the module isn't visible in any way. Note that the
* module remains available in Kohana's cascading file system until the end of the request!
* @param string $module_name
*/
static function deactivate($module_name) {
$installer_class = "{$module_name}_installer";
if (class_exists($installer_class) && method_exists($installer_class, "deactivate")) {
call_user_func_array(array($installer_class, "deactivate"), array());
}
$module = module::get($module_name);
if ($module->loaded()) {
$module->active = false;
$module->save();
}
module::load_modules();
graphics::deactivate_rules($module_name);
block_manager::deactivate_blocks($module_name);
if (module::info($module_name)) {
log::success(
"module", t("Deactivated module %module_name", array("module_name" => $module_name)));
} else {
log::success(
"module", t("Deactivated missing module %module_name", array("module_name" => $module_name)));
}
}
/**
* Deactivate modules that are unavailable or missing, yet still active.
* This happens when a user deletes a module without deactivating it.
*/
static function deactivate_missing_modules() {
foreach (self::$modules as $module_name => $module) {
if (module::is_active($module_name) && !module::info($module_name)) {
module::deactivate($module_name);
}
}
}
/**
* Uninstall a deactivated module. This will call <module>_installer::uninstall() which should
* take whatever steps necessary to make sure that all traces of a module are gone.
* @param string $module_name
*/
static function uninstall($module_name) {
$installer_class = "{$module_name}_installer";
if (class_exists($installer_class) && method_exists($installer_class, "uninstall")) {
call_user_func(array($installer_class, "uninstall"));
}
graphics::remove_rules($module_name);
$module = module::get($module_name);
if ($module->loaded()) {
$module->delete();
}
module::load_modules();
// We could delete the module vars here too, but it's nice to leave them around
// in case the module gets reinstalled.
log::success(
"module", t("Uninstalled module %module_name", array("module_name" => $module_name)));
}
/**
* Load the active modules. This is called at bootstrap time.
*/
static function load_modules() {
self::$modules = array();
self::$active = array();
$kohana_modules = array();
// In version 32 we introduced a weight column so we can specify the module order
// If we try to use that blindly, we'll break earlier versions before they can even
// run the upgrader.
$modules = module::get_version("gallery") < 32 ?
ORM::factory("module")->find_all():
ORM::factory("module")->order_by("weight")->find_all();
foreach ($modules as $module) {
self::$modules[$module->name] = $module;
if (!$module->active) {
continue;
}
if ($module->name == "gallery") {
$gallery = $module;
} else {
self::$active[] = $module;
$kohana_modules[] = MODPATH . $module->name;
}
}
self::$active[] = $gallery; // put gallery last in the module list to match core.modules
$config = Kohana_Config::instance();
$config->set(
"core.modules", array_merge($kohana_modules, $config->get("core.modules")));
}
/**
* Run a specific event on all active modules.
* @param string $name the event name
* @param mixed $data data to pass to each event handler
*/
static function event($name, &$data=null) {
$args = func_get_args();
array_shift($args);
$function = str_replace(".", "_", $name);
if (method_exists("gallery_event", $function)) {
switch (count($args)) {
case 0:
gallery_event::$function();
break;
case 1:
gallery_event::$function($args[0]);
break;
case 2:
gallery_event::$function($args[0], $args[1]);
break;
case 3:
gallery_event::$function($args[0], $args[1], $args[2]);
break;
case 4: // Context menu events have 4 arguments so lets optimize them
gallery_event::$function($args[0], $args[1], $args[2], $args[3]);
break;
default:
call_user_func_array(array("gallery_event", $function), $args);
}
}
foreach (self::$active as $module) {
if ($module->name == "gallery") {
continue;
}
$class = "{$module->name}_event";
if (class_exists($class) && method_exists($class, $function)) {
call_user_func_array(array($class, $function), $args);
}
}
// Give the admin theme a chance to respond, if we're in admin mode.
if (theme::$is_admin) {
$class = theme::$admin_theme_name . "_event";
if (class_exists($class) && method_exists($class, $function)) {
call_user_func_array(array($class, $function), $args);
}
}
// Give the site theme a chance to respond as well. It gets a chance even in admin mode, as
// long as the theme has an admin subdir.
$class = theme::$site_theme_name . "_event";
if (class_exists($class) && method_exists($class, $function)) {
call_user_func_array(array($class, $function), $args);
}
}
/**
* Get a variable from this module
* @param string $module_name
* @param string $name
* @param string $default_value
* @return the value
*/
static function get_var($module_name, $name, $default_value=null) {
// We cache vars so we can load them all at once for performance.
if (empty(self::$var_cache)) {
self::$var_cache = Cache::instance()->get("var_cache");
if (empty(self::$var_cache)) {
// Cache doesn't exist, create it now.
foreach (db::build()
->select("module_name", "name", "value")
->from("vars")
->order_by("module_name")
->order_by("name")
->execute() as $row) {
// Mute the "Creating default object from empty value" warning below
@self::$var_cache->{$row->module_name}->{$row->name} = $row->value;
}
Cache::instance()->set("var_cache", self::$var_cache, array("vars"));
}
}
if (isset(self::$var_cache->$module_name->$name)) {
return self::$var_cache->$module_name->$name;
} else {
return $default_value;
}
}
/**
* Store a variable for this module
* @param string $module_name
* @param string $name
* @param string $value
*/
static function set_var($module_name, $name, $value) {
$var = ORM::factory("var")
->where("module_name", "=", $module_name)
->where("name", "=", $name)
->find();
if (!$var->loaded()) {
$var->module_name = $module_name;
$var->name = $name;
}
$var->value = $value;
$var->save();
Cache::instance()->delete("var_cache");
self::$var_cache = null;
}
/**
* Increment the value of a variable for this module
*
* Note: Frequently updating counters is very inefficient because it invalidates the cache value
* which has to be rebuilt every time we make a change.
*
* @todo Get rid of this and find an alternate approach for all callers (currently only Akismet)
*
* @deprecated
* @param string $module_name
* @param string $name
* @param string $increment (optional, default is 1)
*/
static function incr_var($module_name, $name, $increment=1) {
db::build()
->update("vars")
->set("value", db::expr("`value` + $increment"))
->where("module_name", "=", $module_name)
->where("name", "=", $name)
->execute();
Cache::instance()->delete("var_cache");
self::$var_cache = null;
}
/**
* Remove a variable for this module.
* @param string $module_name
* @param string $name
*/
static function clear_var($module_name, $name) {
db::build()
->delete("vars")
->where("module_name", "=", $module_name)
->where("name", "=", $name)
->execute();
Cache::instance()->delete("var_cache");
self::$var_cache = null;
}
/**
* Remove all variables for this module.
* @param string $module_name
*/
static function clear_all_vars($module_name) {
db::build()
->delete("vars")
->where("module_name", "=", $module_name)
->execute();
Cache::instance()->delete("var_cache");
self::$var_cache = null;
}
/**
* Return the version of the installed module.
* @param string $module_name
*/
static function get_version($module_name) {
return module::get($module_name)->version;
}
/**
* Check if obsolete modules are active and, if so, return a warning message.
* If none are found, return null.
*/
static function get_obsolete_modules_message() {
// This is the obsolete modules list. Any active module that's on the list
// with version number at or below the one given will be considered obsolete.
// It is hard-coded here, and may be updated with future releases of Gallery.
$obsolete_modules = array("videos" => 4, "noffmpeg" => 1, "videodimensions" => 1,
"digibug" => 2);
// Before we check the active modules, deactivate any that are missing.
module::deactivate_missing_modules();
$modules_found = array();
foreach ($obsolete_modules as $module => $version) {
if (module::is_active($module) && (module::get_version($module) <= $version)) {
$modules_found[] = $module;
}
}
if ($modules_found) {
// Need this to be on one super-long line or else the localization scanner may not work.
// (ref: http://sourceforge.net/apps/trac/gallery/ticket/1321)
return t("Recent upgrades to Gallery have made the following modules obsolete: %modules. We recommend that you <a href=\"%url_mod\">deactivate</a> the module(s). For more information, please see the <a href=\"%url_doc\">documentation page</a>.",
array("modules" => implode(", ", $modules_found),
"url_mod" => url::site("admin/modules"),
"url_doc" => "http://codex.galleryproject.org/Gallery3:User_guide:Obsolete_modules"));
}
return null;
}
}