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<?php
//  ------------------------------------------------------------------------ //
//                XOOPS - PHP Content Management System                      //
//                    Copyright (c) 2000 XOOPS.org                           //
//                       <http://www.xoops.org/>                             //
//  ------------------------------------------------------------------------ //
//  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.                                      //
//                                                                           //
//  You may not change or alter any portion of this comment or credits       //
//  of supporting developers from this source code or any supporting         //
//  source code which is considered copyrighted (c) material of the          //
//  original comment or credit authors.                                      //
//                                                                           //
//  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA //
//  ------------------------------------------------------------------------ //
// Author: Kazumi Ono (AKA onokazu)                                          //
// URL: http://www.myweb.ne.jp/, http://www.xoops.org/, http://jp.xoops.org/ //
// Project: The XOOPS Project                                                //
// ------------------------------------------------------------------------- //
/**
 * Manage modules
 *
 * @copyright   http://www.impresscms.org/ The ImpressCMS Project
 * @license     LICENSE.txt
 * @category    ICMS
 * @package     Module
 * @version $Id: Handler.php 12313 2013-09-15 21:14:35Z skenow $
 */

defined("ICMS_ROOT_PATH") or die("ImpressCMS root path is not defined");

/**
 * Module handler class.
 *
 * This class is responsible for providing data access mechanisms to the data source
 * of module class objects.
 *
 * @category    ICMS
 * @package     Module
 * @author  Kazumi Ono  <onokazu@xoops.org>
 * @copyright   Copyright (c) 2000 XOOPS.org
 */
class icms_module_Handler extends icms_core_ObjectHandler {
    /**
     * holds an array of cached module references, indexed by module dirname
     *
     * @var    array
     * @access private
     */
    private $_cachedModule = array();

    /**
     * holds the lookup table for cache access by module id
     *
     * @var    array
     * @access private
     */
    private $_cachedModule_lookup = array();

    /**
     * Create a new {@link icms_module_Object} object
     *
     * @param   boolean     $isNew   Flag the new object as "new"
     * @return  object      {@link icms_module_Object}
     */
    public function &create($isNew = TRUE) {
        $module = new icms_module_Object();
        if ($isNew) $module->setNew();
        return $module;
    }

    /**
     * Load a module from the database
     *
     * @param   int     $id         ID of the module
     * @param   bool    $loadConfig set to TRUE in case you want to load the module config in addition
     * @return  object  {@link icms_module_Object} FALSE on fail
     */
    public function &get($id, $loadConfig = FALSE) {
        $id = (int) $id;
        $module = FALSE;
        if ($id > 0) {
            if (!empty($this->_cachedModule_lookup[$id]) &&
                !empty($this->_cachedModule[$this->_cachedModule_lookup[$id]])
            ) {
                if ($loadConfig) $this->loadConfig($this->_cachedModule[$this->_cachedModule_lookup[$id]]);
                return $this->_cachedModule[$this->_cachedModule_lookup[$id]];
            } else {
                $sql = "SELECT * FROM " . $this->db->prefix('modules') . " WHERE mid = '" . $id . "'";
                if (!$result = $this->db->query($sql)) return $module;
                $numrows = $this->db->getRowsNum($result);
                if ($numrows == 1) {
                    $module = new icms_module_Object();
                    $myrow = $this->db->fetchArray($result);
                    $module->assignVars($myrow);
                    // load module config
                    if ($loadConfig) $this->loadConfig($module);
                    // cache module
                    $this->_cachedModule_lookup[$id] = $module->getVar("dirname");
                    $this->_cachedModule[$module->getVar('dirname')] = $module;
                    return $module;
                }
            }
        }
        return $module;
    }

    /**
     * Load a module by its dirname
     *
     * @param   string  $dirname
     * @param   bool    $loadConfig set to TRUE in case you want to load the module config in addition
     * @return  object  {@link icms_module_Object} FALSE on fail
     */
    public function getByDirname($dirname, $loadConfig = FALSE) {
        if (!empty($this->_cachedModule[$dirname]) &&
            $this->_cachedModule[$dirname]->getVar('dirname') == $dirname
        ) {
            if ($loadConfig) $this->loadConfig($this->_cachedModule[$dirname]);
            return $this->_cachedModule[$dirname];
        } else {
            $module = FALSE;
            $sql = "SELECT * FROM " . $this->db->prefix('modules') . " WHERE dirname = '" . trim($dirname) . "'";
            if (!$result = $this->db->query($sql)) return $module;
            $numrows = $this->db->getRowsNum($result);
            if ($numrows == 1) {
                $module = new icms_module_Object();
                $myrow = $this->db->fetchArray($result);
                $module->assignVars($myrow);
                // load module config
                if ($loadConfig) $this->loadConfig($module);
                // cache module
                $this->_cachedModule[$dirname] = $module;
                $this->_cachedModule_lookup[$module->getVar('mid')] = $module->getVar("dirname");
            }
            return $module;
        }
    }

    /**
     * load config for a module before caching it
     *
     * @param   icms_module_Object  $module
     * @return  bool                TRUE
     */
    private function loadConfig($module) {
        if ($module->config !== NULL) return TRUE;
        icms_loadLanguageFile($module->getVar("dirname"), "main");
        if ($module->getVar("hasconfig") == 1
            || $module->getVar("hascomments") == 1
            || $module->getVar("hasnotification") == 1
        ) {
            $module->config = icms::$config->getConfigsByCat(0, $module->getVar("mid"));
        }
        return TRUE;
    }

    /**
     * Inserts a module into the database
     *
     * @param   object  &$module reference to a {@link icms_module_Object}
     * @return  bool
     */
    public function insert(&$module) {
        if (get_class($module) != 'icms_module_Object') return FALSE;
        if (!$module->isDirty()) return TRUE;
        if (!$module->cleanVars()) return FALSE;

        /**
         * Editing the insert and update methods
         * this is temporaray as will soon be based on a persistableObjectHandler
         */
        $fieldsToStoreInDB = array();
        foreach ($module->cleanVars as $k => $v) {
            if ($k == 'last_update') { $v = time(); }
            if ($module->vars[$k]['data_type'] == XOBJ_DTYPE_INT) {
                $cleanvars[$k] = (int) $v;
            } elseif (is_array($v)) {
                $cleanvars[$k] = $this->db->quoteString(implode(',', $v));
            } else {
                $cleanvars[$k] = $this->db->quoteString($v);
            }
            $fieldsToStoreInDB[$k] = $cleanvars[$k];
        }

        if ($module->isNew()) {
            $sql = "INSERT INTO " . $this->db->prefix('modules')
                . " (" . implode(',', array_keys($fieldsToStoreInDB))
                . ") VALUES (" . implode(',', array_values($fieldsToStoreInDB)) . ")";
        } else {
            $sql = "UPDATE " . $this->db->prefix('modules') . " SET";
            foreach ($fieldsToStoreInDB as $key => $value) {
                if (isset($notfirst)) { $sql .= ","; }
                $sql .= " " . $key . " = " . $value;
                $notfirst = TRUE;
            }
            $whereclause = 'mid' . " = " . $module->getVar('mid');
            $sql .= " WHERE " . $whereclause;
        }

        if (!$result = $this->db->query($sql)) return FALSE;
        if ($module->isNew()) { $module->assignVar('mid', $this->db->getInsertId()); }
        if (!empty($this->_cachedModule[$module->getVar('dirname')])) {
            unset($this->_cachedModule[$module->getVar('dirname')]);
        }
        if (!empty($this->_cachedModule_lookup[$module->getVar('mid')])) {
            unset($this->_cachedModule_loopup[$module->getVar('mid')]);
        }
        return TRUE;
    }

    /**
     * Delete a module from the database
     *
     * @param   object  &$module {@link icms_module_Object}
     * @return  bool
     */
    public function delete(&$module) {
        if (get_class($module) != 'icms_module_Object') return FALSE;

        $sql = sprintf(
            "DELETE FROM %s WHERE mid = '%u'",
            $this->db->prefix('modules'), (int) $module->getVar('mid')
        );
        if (!$result = $this->db->query($sql)) return FALSE;

        // delete admin permissions assigned for this module
        $sql = sprintf(
            "DELETE FROM %s WHERE gperm_name = 'module_admin' AND gperm_itemid = '%u'",
            $this->db->prefix('group_permission'), (int) $module->getVar('mid')
        );
        $this->db->query($sql);
        // delete read permissions assigned for this module
        $sql = sprintf(
            "DELETE FROM %s WHERE gperm_name = 'module_read' AND gperm_itemid = '%u'",
            $this->db->prefix('group_permission'), (int) $module->getVar('mid')
        );
        $this->db->query($sql);

        $sql = sprintf(
            "SELECT block_id FROM %s WHERE module_id = '%u'",
            $this->db->prefix('block_module_link'), (int) $module->getVar('mid')
        );
        if ($result = $this->db->query($sql)) {
            $block_id_arr = array();
            while ($myrow = $this->db->fetchArray($result)) {
                array_push($block_id_arr, $myrow['block_id']);
            }
        }

        // loop through block_id_arr
        if (isset($block_id_arr)) {
            foreach ($block_id_arr as $i) {
                $sql = sprintf(
                    "SELECT block_id FROM %s WHERE module_id != '%u' AND block_id = '%u'",
                    $this->db->prefix('block_module_link'), (int) $module->getVar('mid'), (int) $i
                );
                if ($result2 = $this->db->query($sql)) {
                    if (0 < $this->db->getRowsNum($result2)) {
                        // this block has other entries, so delete the entry for this module
                        $sql = sprintf(
                            "DELETE FROM %s WHERE (module_id = '%u') AND (block_id = '%u')",
                            $this->db->prefix('block_module_link'), (int) $module->getVar('mid'), (int) $i
                        );
                        $this->db->query($sql);
                    } else {
                        // this block doesnt have other entries, so disable the block and let it show on top page only. otherwise, this block will not display anymore on block admin page!
                        $sql = sprintf(
                            "UPDATE %s SET visible = '0' WHERE bid = '%u'",
                            $this->db->prefix('newblocks'), (int) $i
                        );
                        $this->db->query($sql);
                        $sql = sprintf(
                            "UPDATE %s SET module_id = '-1' WHERE module_id = '%u'",
                            $this->db->prefix('block_module_link'), (int) $module->getVar('mid')
                        );
                        $this->db->query($sql);
                    }
                }
            }
        }

        if (!empty($this->_cachedModule[$module->getVar('dirname')])) {
            unset($this->_cachedModule[$module->getVar('dirname')]);
        }
        if (!empty($this->_cachedModule_lookup[$module->getVar('mid')])) {
            unset($this->_cachedModule_lookup[$module->getVar('mid')]);
        }
        return TRUE;
    }

    /**
     * Retrieve list of installed modules from the database
     *
     * @param   object  $criteria   {@link icms_db_criteria_Element}
     * @param   boolean $id_as_key  Use the ID as key into the array
     * @return  array   Array of objects - installed module
     */
    public function getObjects($criteria = NULL, $id_as_key = FALSE) {
        $ret = array();
        $limit = $start = 0;
        $sql = "SELECT * FROM " . $this->db->prefix('modules');
        if (isset($criteria) && is_subclass_of($criteria, 'icms_db_criteria_Element')) {
            $sql .= " " . $criteria->renderWhere();
            $sql .= " ORDER BY weight " . $criteria->getOrder() . ", mid ASC";
            $limit = $criteria->getLimit();
            $start = $criteria->getStart();
        }
        $result = $this->db->query($sql, $limit, $start);
        if (!$result) return $ret;
        while ($myrow = $this->db->fetchArray($result)) {
            $module = new icms_module_Object();
            $module->assignVars($myrow);
            if (!$id_as_key) {
                $ret[] = $module;
            } else {
                $ret[$myrow['mid']] = $module;
            }
            $this->_cachedModule_lookup[$myrow['mid']] = $module->getVar("dirname");
            $this->_cachedModule[$myrow['dirname']] = $module;
            unset($module);
        }
        return $ret;
    }

    /**
     * Count some modules
     *
     * @param   object  $criteria   {@link icms_db_criteria_Element}
     * @return  int
     */
    public function getCount($criteria = NULL) {
        $sql = "SELECT COUNT(*) FROM " . $this->db->prefix('modules');
        if (isset($criteria) && is_subclass_of($criteria, 'icms_db_criteria_Element')) {
            $sql .= " " . $criteria->renderWhere();
        }
        if (!$result = $this->db->query($sql)) return 0;
        list($count) = $this->db->fetchRow($result);
        return $count;
    }

    /**
     * returns an array of installed module names
     *
     * @param   bool    $criteria
     * @param   boolean $dirname_as_key
     *      if TRUE, array keys will be module directory names
     *      if FALSE, array keys will be module id
     * @return  array
     */
    public function getList($criteria = NULL, $dirname_as_key = FALSE) {
        $ret = array();
        $modules = $this->getObjects($criteria, TRUE);
        foreach (array_keys($modules) as $i) {
            if (!$dirname_as_key) {
                $ret[$i] = $modules[$i]->getVar('name');
            } else {
                $ret[$modules[$i]->getVar('dirname')] = $modules[$i]->getVar('name');
            }
        }
        return $ret;
    }

    /**
     * Returns an array of all available modules, based on folders in the modules directory
     *
     * The getList method cannot be used for this, because uninstalled modules are not listed
     * in the database
     *
     * @since   1.3
     * @return  array   List of folder names in the modules directory
     */
    static public function getAvailable() {
        $dirtyList = $cleanList = array();
        $dirtyList = icms_core_Filesystem::getDirList(ICMS_MODULES_PATH . '/');
        foreach ($dirtyList as $item) {
            if (file_exists(ICMS_MODULES_PATH . '/' . $item . '/icms_version.php')) {
                $cleanList[$item] = $item;
            } elseif (file_exists(ICMS_MODULES_PATH . '/' . $item . '/xoops_version.php')) {
                $cleanList[$item] = $item;
            }
        }
        return $cleanList;
    }

    /**
     * Get a list of active modules, with the folder name as the key
     *
     * This method is necessary to be able to use a static method
     *
     * @since   1.3
     * @return  array   List of active modules
     */
    static public function getActive() {
        $module_handler = new self(icms::$xoopsDB);
        $criteria = new icms_db_criteria_Compo(new icms_db_criteria_Item('isactive', 1));
        return $module_handler->getList($criteria, TRUE);
    }

    /**
     * Finds and initializes the current module.
     * @param bool $inAdmin Whether we are on the admin side or not
     */
    static public function service($inAdmin = FALSE) {
        $module = NULL;
        if ($inAdmin || file_exists('./xoops_version.php') || file_exists('./icms_version.php')) {
            $url_arr = explode('/', strstr($_SERVER['PHP_SELF'], '/modules/'));
            if (isset($url_arr[2])) {
                /* @var $module icms_module_Object */
                $module = icms::handler("icms_module")->getByDirname($url_arr[2], TRUE);
                if (!$inAdmin && (!$module || !$module->getVar('isactive'))) {
                    include_once ICMS_ROOT_PATH . '/header.php';
                    echo "<h4>" . _MODULENOEXIST . "</h4>";
                    include_once ICMS_ROOT_PATH . '/footer.php';
                    exit();
                }
            }
        }
        if (!self::checkModuleAccess($module, $inAdmin)) {
            redirect_header(ICMS_URL . "/user.php", 3, _NOPERM, FALSE);
        }
        if ($module) $module->launch();
        return $module ? $module : NULL;
    }
    /**
     * Checks if the current user can access the specified module
     * @param icms_module_Object $module
     * @param bool $inAdmin
     * @return bool
     */
    static public function checkModuleAccess($module, $inAdmin = FALSE) {
        if ($inAdmin && !icms::$user) return FALSE;
        /* @var $perm_handler icms_member_groupperm_Handler */
        $perm_handler = icms::handler('icms_member_groupperm');
        if ($inAdmin) {
            if (!$module) {
                // We are in /admin.php
                return icms::$user->isAdmin(-1);
            } else {
                return $perm_handler->checkRight('module_admin', $module->getVar('mid'), icms::$user->getGroups());
            }
        } elseif ($module) {
            $groups = (icms::$user) ? icms::$user->getGroups() : ICMS_GROUP_ANONYMOUS;
            return $perm_handler->checkRight('module_read', $module->getVar('mid'), $groups);
        }
        // We are in /something.php: let the page handle permissions
        return TRUE;
    }
}
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