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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/

/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
    exit;
}

class acp_extensions
{
    var $u_action;

    private $db;
    private $config;
    private $template;
    private $user;
    private $cache;
    private $log;
    private $request;

    function main()
    {
        // Start the page
        global $config, $user, $template, $request, $phpbb_extension_manager, $db, $phpbb_root_path, $phpEx, $phpbb_log, $cache;

        $this->db = $db;
        $this->config = $config;
        $this->template = $template;
        $this->user = $user;
        $this->cache = $cache;
        $this->request = $request;
        $this->log = $phpbb_log;

        $user->add_lang(array('install', 'acp/extensions', 'migrator'));

        $this->page_title = 'ACP_EXTENSIONS';

        $action = $request->variable('action', 'list');
        $ext_name = $request->variable('ext_name', '');

        // What is a safe limit of execution time? Half the max execution time should be safe.
        $safe_time_limit = (ini_get('max_execution_time') / 2);
        $start_time = time();

        // Cancel action
        if ($request->is_set_post('cancel'))
        {
            $action = 'list';
            $ext_name = '';
        }

        if (in_array($action, array('enable', 'disable', 'delete_data')) && !check_link_hash($request->variable('hash', ''), $action . '.' . $ext_name))
        {
            trigger_error('FORM_INVALID', E_USER_WARNING);
        }

        // If they've specified an extension, let's load the metadata manager and validate it.
        if ($ext_name)
        {
            $md_manager = new phpbbextensionmetadata_manager($ext_name, $config, $phpbb_extension_manager, $template, $user, $phpbb_root_path);

            try
            {
                $md_manager->get_metadata('all');
            }
            catch (phpbbextensionexception $e)
            {
                trigger_error($e, E_USER_WARNING);
            }
        }

        // What are we doing?
        switch ($action)
        {
            case 'set_config_version_check_force_unstable':
                $force_unstable = $this->request->variable('force_unstable', false);

                if ($force_unstable)
                {
                    $s_hidden_fields = build_hidden_fields(array(
                        'force_unstable'    => $force_unstable,
                    ));

                    confirm_box(false, $user->lang('EXTENSION_FORCE_UNSTABLE_CONFIRM'), $s_hidden_fields);
                }
                else
                {
                    $config->set('extension_force_unstable', false);
                    trigger_error($user->lang['CONFIG_UPDATED'] . adm_back_link($this->u_action));
                }
                break;

            case 'list':
            default:
                if (confirm_box(true))
                {
                    $config->set('extension_force_unstable', true);
                    trigger_error($user->lang['CONFIG_UPDATED'] . adm_back_link($this->u_action));
                }

                $this->list_enabled_exts($phpbb_extension_manager);
                $this->list_disabled_exts($phpbb_extension_manager);
                $this->list_available_exts($phpbb_extension_manager);

                $this->template->assign_vars(array(
                    'U_VERSIONCHECK_FORCE'     => $this->u_action . '&amp;action=list&amp;versioncheck_force=1',
                    'FORCE_UNSTABLE'        => $config['extension_force_unstable'],
                    'U_ACTION'                 => $this->u_action,
                ));

                $this->tpl_name = 'acp_ext_list';
            break;

            case 'enable_pre':
                if (!$md_manager->validate_dir())
                {
                    trigger_error($user->lang['EXTENSION_DIR_INVALID'] . adm_back_link($this->u_action), E_USER_WARNING);
                }

                if (!$md_manager->validate_enable())
                {
                    trigger_error($user->lang['EXTENSION_NOT_AVAILABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
                }

                $extension = $phpbb_extension_manager->get_extension($ext_name);
                if (!$extension->is_enableable())
                {
                    trigger_error($user->lang['EXTENSION_NOT_ENABLEABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
                }

                if ($phpbb_extension_manager->is_enabled($ext_name))
                {
                    redirect($this->u_action);
                }

                $this->tpl_name = 'acp_ext_enable';

                $template->assign_vars(array(
                    'PRE'                => true,
                    'L_CONFIRM_MESSAGE'    => $this->user->lang('EXTENSION_ENABLE_CONFIRM', $md_manager->get_metadata('display-name')),
                    'U_ENABLE'            => $this->u_action . '&amp;action=enable&amp;ext_name=' . urlencode($ext_name) . '&amp;hash=' . generate_link_hash('enable.' . $ext_name),
                ));
            break;

            case 'enable':
                if (!$md_manager->validate_dir())
                {
                    trigger_error($user->lang['EXTENSION_DIR_INVALID'] . adm_back_link($this->u_action), E_USER_WARNING);
                }

                if (!$md_manager->validate_enable())
                {
                    trigger_error($user->lang['EXTENSION_NOT_AVAILABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
                }

                $extension = $phpbb_extension_manager->get_extension($ext_name);
                if (!$extension->is_enableable())
                {
                    trigger_error($user->lang['EXTENSION_NOT_ENABLEABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
                }

                try
                {
                    while ($phpbb_extension_manager->enable_step($ext_name))
                    {
                        // Are we approaching the time limit? If so we want to pause the update and continue after refreshing
                        if ((time() - $start_time) >= $safe_time_limit)
                        {
                            $template->assign_var('S_NEXT_STEP', true);

                            meta_refresh(0, $this->u_action . '&amp;action=enable&amp;ext_name=' . urlencode($ext_name) . '&amp;hash=' . generate_link_hash('enable.' . $ext_name));
                        }
                    }
                    $this->log->add('admin', $user->data['user_id'], $user->ip, 'LOG_EXT_ENABLE', time(), array($ext_name));
                }
                catch (phpbbdbmigrationexception $e)
                {
                    $template->assign_var('MIGRATOR_ERROR', $e->getLocalisedMessage($user));
                }

                $this->tpl_name = 'acp_ext_enable';

                $template->assign_vars(array(
                    'U_RETURN'        => $this->u_action . '&amp;action=list',
                ));
            break;

            case 'disable_pre':
                if (!$phpbb_extension_manager->is_enabled($ext_name))
                {
                    redirect($this->u_action);
                }

                $this->tpl_name = 'acp_ext_disable';

                $template->assign_vars(array(
                    'PRE'                => true,
                    'L_CONFIRM_MESSAGE'    => $this->user->lang('EXTENSION_DISABLE_CONFIRM', $md_manager->get_metadata('display-name')),
                    'U_DISABLE'            => $this->u_action . '&amp;action=disable&amp;ext_name=' . urlencode($ext_name) . '&amp;hash=' . generate_link_hash('disable.' . $ext_name),
                ));
            break;

            case 'disable':
                if (!$phpbb_extension_manager->is_enabled($ext_name))
                {
                    redirect($this->u_action);
                }

                while ($phpbb_extension_manager->disable_step($ext_name))
                {
                    // Are we approaching the time limit? If so we want to pause the update and continue after refreshing
                    if ((time() - $start_time) >= $safe_time_limit)
                    {
                        $template->assign_var('S_NEXT_STEP', true);

                        meta_refresh(0, $this->u_action . '&amp;action=disable&amp;ext_name=' . urlencode($ext_name) . '&amp;hash=' . generate_link_hash('disable.' . $ext_name));
                    }
                }
                $this->log->add('admin', $user->data['user_id'], $user->ip, 'LOG_EXT_DISABLE', time(), array($ext_name));

                $this->tpl_name = 'acp_ext_disable';

                $template->assign_vars(array(
                    'U_RETURN'    => $this->u_action . '&amp;action=list',
                ));
            break;

            case 'delete_data_pre':
                if ($phpbb_extension_manager->is_enabled($ext_name))
                {
                    redirect($this->u_action);
                }
                $this->tpl_name = 'acp_ext_delete_data';

                $template->assign_vars(array(
                    'PRE'                => true,
                    'L_CONFIRM_MESSAGE'    => $this->user->lang('EXTENSION_DELETE_DATA_CONFIRM', $md_manager->get_metadata('display-name')),
                    'U_PURGE'            => $this->u_action . '&amp;action=delete_data&amp;ext_name=' . urlencode($ext_name) . '&amp;hash=' . generate_link_hash('delete_data.' . $ext_name),
                ));
            break;

            case 'delete_data':
                if ($phpbb_extension_manager->is_enabled($ext_name))
                {
                    redirect($this->u_action);
                }

                try
                {
                    while ($phpbb_extension_manager->purge_step($ext_name))
                    {
                        // Are we approaching the time limit? If so we want to pause the update and continue after refreshing
                        if ((time() - $start_time) >= $safe_time_limit)
                        {
                            $template->assign_var('S_NEXT_STEP', true);

                            meta_refresh(0, $this->u_action . '&amp;action=delete_data&amp;ext_name=' . urlencode($ext_name) . '&amp;hash=' . generate_link_hash('delete_data.' . $ext_name));
                        }
                    }
                    $this->log->add('admin', $user->data['user_id'], $user->ip, 'LOG_EXT_PURGE', time(), array($ext_name));
                }
                catch (phpbbdbmigrationexception $e)
                {
                    $template->assign_var('MIGRATOR_ERROR', $e->getLocalisedMessage($user));
                }

                $this->tpl_name = 'acp_ext_delete_data';

                $template->assign_vars(array(
                    'U_RETURN'    => $this->u_action . '&amp;action=list',
                ));
            break;

            case 'details':
                // Output it to the template
                $md_manager->output_template_data();

                try
                {
                    $updates_available = $this->version_check($md_manager, $request->variable('versioncheck_force', false));

                    $template->assign_vars(array(
                        'S_UP_TO_DATE'        => empty($updates_available),
                        'S_VERSIONCHECK'    => true,
                        'UP_TO_DATE_MSG'    => $this->user->lang(empty($updates_available) ? 'UP_TO_DATE' : 'NOT_UP_TO_DATE', $md_manager->get_metadata('display-name')),
                    ));

                    foreach ($updates_available as $branch => $version_data)
                    {
                        $template->assign_block_vars('updates_available', $version_data);
                    }
                }
                catch (RuntimeException $e)
                {
                    $template->assign_vars(array(
                        'S_VERSIONCHECK_STATUS'            => $e->getCode(),
                        'VERSIONCHECK_FAIL_REASON'        => ($e->getMessage() !== $user->lang('VERSIONCHECK_FAIL')) ? $e->getMessage() : '',
                    ));
                }

                $template->assign_vars(array(
                    'U_BACK'                => $this->u_action . '&amp;action=list',
                    'U_VERSIONCHECK_FORCE'    => $this->u_action . '&amp;action=details&amp;versioncheck_force=1&amp;ext_name=' . urlencode($md_manager->get_metadata('name')),
                ));

                $this->tpl_name = 'acp_ext_details';
            break;
        }
    }

    /**
    * Lists all the enabled extensions and dumps to the template
    *
    * @param  $phpbb_extension_manager     An instance of the extension manager
    * @return null
    */
    public function list_enabled_exts(phpbbextensionmanager $phpbb_extension_manager)
    {
        $enabled_extension_meta_data = array();

        foreach ($phpbb_extension_manager->all_enabled() as $name => $location)
        {
            $md_manager = $phpbb_extension_manager->create_extension_metadata_manager($name, $this->template);

            try
            {
                $meta = $md_manager->get_metadata('all');
                $enabled_extension_meta_data[$name] = array(
                    'META_DISPLAY_NAME' => $md_manager->get_metadata('display-name'),
                    'META_VERSION' => $meta['version'],
                );

                $force_update = $this->request->variable('versioncheck_force', false);
                $updates = $this->version_check($md_manager, $force_update, !$force_update);

                $enabled_extension_meta_data[$name]['S_UP_TO_DATE'] = empty($updates);
                $enabled_extension_meta_data[$name]['S_VERSIONCHECK'] = true;
                $enabled_extension_meta_data[$name]['U_VERSIONCHECK_FORCE'] = $this->u_action . '&amp;action=details&amp;versioncheck_force=1&amp;ext_name=' . urlencode($md_manager->get_metadata('name'));
            }
            catch (phpbbextensionexception $e)
            {
                $this->template->assign_block_vars('disabled', array(
                    'META_DISPLAY_NAME'        => $this->user->lang('EXTENSION_INVALID_LIST', $name, $e),
                    'S_VERSIONCHECK'        => false,
                ));
            }
            catch (RuntimeException $e)
            {
                $enabled_extension_meta_data[$name]['S_VERSIONCHECK'] = false;
            }
        }

        uasort($enabled_extension_meta_data, array($this, 'sort_extension_meta_data_table'));

        foreach ($enabled_extension_meta_data as $name => $block_vars)
        {
            $block_vars['NAME'] = $name;
            $block_vars['U_DETAILS'] = $this->u_action . '&amp;action=details&amp;ext_name=' . urlencode($name);

            $this->template->assign_block_vars('enabled', $block_vars);

            $this->output_actions('enabled', array(
                'DISABLE'        => $this->u_action . '&amp;action=disable_pre&amp;ext_name=' . urlencode($name),
            ));
        }
    }

    /**
    * Lists all the disabled extensions and dumps to the template
    *
    * @param  $phpbb_extension_manager     An instance of the extension manager
    * @return null
    */
    public function list_disabled_exts(phpbbextensionmanager $phpbb_extension_manager)
    {
        $disabled_extension_meta_data = array();

        foreach ($phpbb_extension_manager->all_disabled() as $name => $location)
        {
            $md_manager = $phpbb_extension_manager->create_extension_metadata_manager($name, $this->template);

            try
            {
                $meta = $md_manager->get_metadata('all');
                $disabled_extension_meta_data[$name] = array(
                    'META_DISPLAY_NAME' => $md_manager->get_metadata('display-name'),
                    'META_VERSION' => $meta['version'],
                );

                $force_update = $this->request->variable('versioncheck_force', false);
                $updates = $this->version_check($md_manager, $force_update, !$force_update);

                $disabled_extension_meta_data[$name]['S_UP_TO_DATE'] = empty($updates);
                $disabled_extension_meta_data[$name]['S_VERSIONCHECK'] = true;
                $disabled_extension_meta_data[$name]['U_VERSIONCHECK_FORCE'] = $this->u_action . '&amp;action=details&amp;versioncheck_force=1&amp;ext_name=' . urlencode($md_manager->get_metadata('name'));
            }
            catch (phpbbextensionexception $e)
            {
                $this->template->assign_block_vars('disabled', array(
                    'META_DISPLAY_NAME'        => $this->user->lang('EXTENSION_INVALID_LIST', $name, $e),
                    'S_VERSIONCHECK'        => false,
                ));
            }
            catch (RuntimeException $e)
            {
                $disabeld_extension_meta_data[$name]['S_VERSIONCHECK'] = false;
            }
        }

        uasort($disabled_extension_meta_data, array($this, 'sort_extension_meta_data_table'));

        foreach ($disabled_extension_meta_data as $name => $block_vars)
        {
            $block_vars['NAME'] = $name;
            $block_vars['U_DETAILS'] = $this->u_action . '&amp;action=details&amp;ext_name=' . urlencode($name);

            $this->template->assign_block_vars('disabled', $block_vars);

            $this->output_actions('disabled', array(
                'ENABLE'        => $this->u_action . '&amp;action=enable_pre&amp;ext_name=' . urlencode($name),
                'DELETE_DATA'    => $this->u_action . '&amp;action=delete_data_pre&amp;ext_name=' . urlencode($name),
            ));
        }
    }

    /**
    * Lists all the available extensions and dumps to the template
    *
    * @param  $phpbb_extension_manager     An instance of the extension manager
    * @return null
    */
    public function list_available_exts(phpbbextensionmanager $phpbb_extension_manager)
    {
        $uninstalled = array_diff_key($phpbb_extension_manager->all_available(), $phpbb_extension_manager->all_configured());

        $available_extension_meta_data = array();

        foreach ($uninstalled as $name => $location)
        {
            $md_manager = $phpbb_extension_manager->create_extension_metadata_manager($name, $this->template);

            try
            {
                $meta = $md_manager->get_metadata('all');
                $available_extension_meta_data[$name] = array(
                    'META_DISPLAY_NAME' => $md_manager->get_metadata('display-name'),
                    'META_VERSION' => $meta['version'],
                );

                $force_update = $this->request->variable('versioncheck_force', false);
                $updates = $this->version_check($md_manager, $force_update, !$force_update);

                $available_extension_meta_data[$name]['S_UP_TO_DATE'] = empty($updates);
                $available_extension_meta_data[$name]['S_VERSIONCHECK'] = true;
                $available_extension_meta_data[$name]['U_VERSIONCHECK_FORCE'] = $this->u_action . '&amp;action=details&amp;versioncheck_force=1&amp;ext_name=' . urlencode($md_manager->get_metadata('name'));
            }
            catch (phpbbextensionexception $e)
            {
                $this->template->assign_block_vars('disabled', array(
                    'META_DISPLAY_NAME'        => $this->user->lang('EXTENSION_INVALID_LIST', $name, $e),
                    'S_VERSIONCHECK'        => false,
                ));
            }
            catch (RuntimeException $e)
            {
                $available_extension_meta_data[$name]['S_VERSIONCHECK'] = false;
            }
        }

        uasort($available_extension_meta_data, array($this, 'sort_extension_meta_data_table'));

        foreach ($available_extension_meta_data as $name => $block_vars)
        {
            $block_vars['NAME'] = $name;
            $block_vars['U_DETAILS'] = $this->u_action . '&amp;action=details&amp;ext_name=' . urlencode($name);

            $this->template->assign_block_vars('disabled', $block_vars);

            $this->output_actions('disabled', array(
                'ENABLE'        => $this->u_action . '&amp;action=enable_pre&amp;ext_name=' . urlencode($name),
            ));
        }
    }

    /**
    * Output actions to a block
    *
    * @param string $block
    * @param array $actions
    */
    private function output_actions($block, $actions)
    {
        foreach ($actions as $lang => $url)
        {
            $this->template->assign_block_vars($block . '.actions', array(
                'L_ACTION'            => $this->user->lang('EXTENSION_' . $lang),
                'L_ACTION_EXPLAIN'    => (isset($this->user->lang['EXTENSION_' . $lang . '_EXPLAIN'])) ? $this->user->lang('EXTENSION_' . $lang . '_EXPLAIN') : '',
                'U_ACTION'            => $url,
            ));
        }
    }

    /**
    * Check the version and return the available updates.
    *
    * @param phpbbextensionmetadata_manager $md_manager The metadata manager for the version to check.
    * @param bool $force_update Ignores cached data. Defaults to false.
    * @param bool $force_cache Force the use of the cache. Override $force_update.
    * @return string
    * @throws RuntimeException
    */
    protected function version_check(phpbbextensionmetadata_manager $md_manager, $force_update = false, $force_cache = false)
    {
        $meta = $md_manager->get_metadata('all');

        if (!isset($meta['extra']['version-check']))
        {
            throw new RuntimeException($this->user->lang('NO_VERSIONCHECK'), 1);
        }

        $version_check = $meta['extra']['version-check'];

        $version_helper = new phpbbversion_helper($this->cache, $this->config, new phpbbfile_downloader(), $this->user);
        $version_helper->set_current_version($meta['version']);
        $version_helper->set_file_location($version_check['host'], $version_check['directory'], $version_check['filename'], isset($version_check['ssl']) ? $version_check['ssl'] : false);
        $version_helper->force_stability($this->config['extension_force_unstable'] ? 'unstable' : null);

        return $updates = $version_helper->get_suggested_updates($force_update, $force_cache);
    }

    /**
    * Sort helper for the table containing the metadata about the extensions.
    */
    protected function sort_extension_meta_data_table($val1, $val2)
    {
        return strnatcasecmp($val1['META_DISPLAY_NAME'], $val2['META_DISPLAY_NAME']);
    }
}