Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle 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 3 of the License, or

// (at your option) any later version.

//

// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**

 * The main interface for recycle bin methods.

 *

 * @package    tool_recyclebin

 * @copyright  2015 University of Kent

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

namespace tool_recyclebin;

defined('MOODLE_INTERNAL') || die();

define('TOOL_RECYCLEBIN_COURSE_BIN_FILEAREA', 'recyclebin_course');

/**

 * Represents a course's recyclebin.

 *

 * @package    tool_recyclebin

 * @copyright  2015 University of Kent

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class course_bin extends base_bin {

    /**

     * @var int The course id.

     */

    protected $_courseid;

    /**

     * Constructor.

     *

     * @param int $courseid Course ID.

     */

    public function __construct($courseid) {

        $this->_courseid = $courseid;

    }

    /**

     * Is this recyclebin enabled?

     *

     * @return bool true if enabled, false if not.

     */

    public static function is_enabled() {

        return get_config('tool_recyclebin', 'coursebinenable');

    }

    /**

     * Returns an item from the recycle bin.

     *

     * @param int $itemid Item ID to retrieve.

     * @return \stdClass the item.

     */

    public function get_item($itemid) {

        global $DB;

        return $DB->get_record('tool_recyclebin_course', array(

            'id' => $itemid

        ), '*', MUST_EXIST);

    }

    /**

     * Returns a list of items in the recycle bin for this course.

     *

     * @return array the list of items.

     */

    public function get_items() {

        global $DB;

        return $DB->get_records('tool_recyclebin_course', array(

            'courseid' => $this->_courseid

        ));

    }

    /**

     * Store a course module in the recycle bin.

     *

     * @param \stdClass $cm Course module

     * @throws \moodle_exception

     */

    public function store_item($cm) {

        global $CFG, $DB;

        require_once($CFG->dirroot . '/backup/util/includes/backup_includes.php');

        // Get more information.

        $modinfo = get_fast_modinfo($cm->course);

        if (!isset($modinfo->cms[$cm->id])) {

            return; // Can't continue without the module information.

        }

        $cminfo = $modinfo->cms[$cm->id];

        // Check backup/restore support.

        if (!plugin_supports('mod', $cminfo->modname , FEATURE_BACKUP_MOODLE2)) {

            return;

        }

        // As far as recycle bin is using MODE_AUTOMATED, it observes the backup_auto_storage

        // settings (storing backups @ real location and potentially not including files).

        // For recycle bin we want to ensure that backup files are always stored in Moodle file

        // area and always contain the users' files. In order to achieve that, we hack the

        // setting here via $CFG->forced_plugin_settings, so it won't interfere other operations.

        // See MDL-65218 and MDL-35773 for more information.

        // This hack will be removed once recycle bin switches to use its own backup mode, with

        // own preferences and 100% separate from MOODLE_AUTOMATED.

        // TODO: Remove this as part of MDL-65228.

        $CFG->forced_plugin_settings['backup'] = ['backup_auto_storage' => 0, 'backup_auto_files' => 1];

        // Backup the activity.

        $user = get_admin();

        $controller = new \backup_controller(

            \backup::TYPE_1ACTIVITY,

            $cm->id,

            \backup::FORMAT_MOODLE,

            \backup::INTERACTIVE_NO,

            \backup::MODE_AUTOMATED,

            $user->id

        );

        // When "backup_auto_activities" setting is disabled, activities can't be restored from recycle bin.

        $plan = $controller->get_plan();

        $activitiessettings = $plan->get_setting('activities');

        $settingsvalue = $activitiessettings->get_value();

        if (empty($settingsvalue)) {

            $controller->destroy();

            return;

        }

        $controller->execute_plan();

        // We don't need the forced setting anymore, hence unsetting it.

        // TODO: Remove this as part of MDL-65228.

        unset($CFG->forced_plugin_settings['backup']);

        // Grab the result.

        $result = $controller->get_results();

        if (!isset($result['backup_destination'])) {

            throw new \moodle_exception('Failed to backup activity prior to deletion.');

        }

        // Have finished with the controller, let's destroy it, freeing mem and resources.

        $controller->destroy();

        // Grab the filename.

        $file = $result['backup_destination'];

        if (!$file->get_contenthash()) {

            throw new \moodle_exception('Failed to backup activity prior to deletion (invalid file).');

        }

        // Record the activity, get an ID.

        $activity = new \stdClass();

        $activity->courseid = $cm->course;

        $activity->section = $cm->section;

        $activity->module = $cm->module;

        $activity->name = $cminfo->name;

        $activity->timecreated = time();

        $binid = $DB->insert_record('tool_recyclebin_course', $activity);

        // Create the location we want to copy this file to.

        $filerecord = array(

            'contextid' => \context_course::instance($this->_courseid)->id,

            'component' => 'tool_recyclebin',

            'filearea' => TOOL_RECYCLEBIN_COURSE_BIN_FILEAREA,

            'itemid' => $binid,

            'timemodified' => time()

        );

        // Move the file to our own special little place.

        $fs = get_file_storage();

        if (!$fs->create_file_from_storedfile($filerecord, $file)) {

            // Failed, cleanup first.

            $DB->delete_records('tool_recyclebin_course', array(

                'id' => $binid

            ));

            throw new \moodle_exception("Failed to copy backup file to recyclebin.");

        }

        // Delete the old file.

        $file->delete();

        // Fire event.

        $event = \tool_recyclebin\event\course_bin_item_created::create(array(

            'objectid' => $binid,

            'context' => \context_course::instance($cm->course)

        ));

        $event->trigger();

    }

    /**

     * Restore an item from the recycle bin.

     *

     * @param \stdClass $item The item database record

     * @throws \moodle_exception

     */

    public function restore_item($item) {

        global $CFG, $OUTPUT, $PAGE;

        require_once($CFG->dirroot . '/backup/util/includes/restore_includes.php');

        $user = get_admin();

        // Grab the course context.

        $context = \context_course::instance($this->_courseid);

        // Get the files..

        $fs = get_file_storage();

        $files = $fs->get_area_files($context->id, 'tool_recyclebin', TOOL_RECYCLEBIN_COURSE_BIN_FILEAREA, $item->id,

            'itemid, filepath, filename', false);

        if (empty($files)) {

            throw new \moodle_exception('Invalid recycle bin item!');

        }

        if (count($files) > 1) {

            throw new \moodle_exception('Too many files found!');

        }

        // Get the backup file.

        $file = reset($files);

        // Get a backup temp directory name and create it.

        $tempdir = \restore_controller::get_tempdir_name($context->id, $user->id);

        $fulltempdir = make_backup_temp_directory($tempdir);

        // Extract the backup to tempdir.

        $fb = get_file_packer('application/vnd.moodle.backup');

        $fb->extract_to_pathname($file, $fulltempdir);

        // As far as recycle bin is using MODE_AUTOMATED, it observes the General restore settings.

        // For recycle bin we want to ensure that backup files are always restore the users and groups information.

        // In order to achieve that, we hack the setting here via $CFG->forced_plugin_settings,

        // so it won't interfere other operations.

        // See MDL-65218 and MDL-35773 for more information.

        // This hack will be removed once recycle bin switches to use its own backup mode, with

        // own preferences and 100% separate from MOODLE_AUTOMATED.

        // TODO: Remove this as part of MDL-65228.

        $CFG->forced_plugin_settings['restore'] = ['restore_general_users' => 1, 'restore_general_groups' => 1];

        // Define the import.

        $controller = new \restore_controller(

            $tempdir,

            $this->_courseid,

            \backup::INTERACTIVE_NO,

            \backup::MODE_AUTOMATED,

            $user->id,

            \backup::TARGET_EXISTING_ADDING

        );

        // Prechecks.

        if (!$controller->execute_precheck()) {

            $results = $controller->get_precheck_results();

            // If errors are found then delete the file we created.

            if (!empty($results['errors'])) {

                fulldelete($fulltempdir);

                echo $OUTPUT->header();

                $backuprenderer = $PAGE->get_renderer('core', 'backup');

                echo $backuprenderer->precheck_notices($results);

                echo $OUTPUT->continue_button(new \moodle_url('/course/view.php', array('id' => $this->_courseid)));

                echo $OUTPUT->footer();

                exit();

            }

        }

        // Run the import.

        $controller->execute_plan();

        // We don't need the forced setting anymore, hence unsetting it.

        // TODO: Remove this as part of MDL-65228.

        unset($CFG->forced_plugin_settings['restore']);

        // Have finished with the controller, let's destroy it, freeing mem and resources.

        $controller->destroy();

        // Fire event.

        $event = \tool_recyclebin\event\course_bin_item_restored::create(array(

            'objectid' => $item->id,

            'context' => $context

        ));

        $event->add_record_snapshot('tool_recyclebin_course', $item);

        $event->trigger();

        // Cleanup.

        fulldelete($fulltempdir);

        $this->delete_item($item);

    }

    /**

     * Delete an item from the recycle bin.

     *

     * @param \stdClass $item The item database record

     */

    public function delete_item($item) {

        global $DB;

        // Grab the course context.

        $context = \context_course::instance($this->_courseid, IGNORE_MISSING);

        if (!empty($context)) {

            // Delete the files.

            $fs = get_file_storage();

            $fs->delete_area_files($context->id, 'tool_recyclebin', TOOL_RECYCLEBIN_COURSE_BIN_FILEAREA, $item->id);

        } else {

            // Course context has been deleted. Find records using $item->id as this is unique for course bin recyclebin.

            $files = $DB->get_recordset('files', [

                'component' => 'tool_recyclebin',

                'filearea' => TOOL_RECYCLEBIN_COURSE_BIN_FILEAREA,

                'itemid' => $item->id,

            ]);

            $fs = get_file_storage();

            foreach ($files as $filer) {

                $file = $fs->get_file_instance($filer);

                $file->delete();

            }

            $files->close();

        }

        // Delete the record.

        $DB->delete_records('tool_recyclebin_course', array(

            'id' => $item->id

        ));

        // The course might have been deleted, check we have a context.

        $context = \context_course::instance($item->courseid, \IGNORE_MISSING);

        if (!$context) {

            return;

        }

        // Fire event.

        $event = \tool_recyclebin\event\course_bin_item_deleted::create(array(

            'objectid' => $item->id,

            'context' => $context

        ));

        $event->add_record_snapshot('tool_recyclebin_course', $item);

        $event->trigger();

    }

    /**

     * Can we view items in this recycle bin?

     *

     * @return bool returns true if they can view, false if not

     */

    public function can_view() {

        $context = \context_course::instance($this->_courseid);

        return has_capability('tool/recyclebin:viewitems', $context);

    }

    /**

     * Can we restore items in this recycle bin?

     *

     * @return bool returns true if they can restore, false if not

     */

    public function can_restore() {

        $context = \context_course::instance($this->_courseid);

        return has_capability('tool/recyclebin:restoreitems', $context);

    }

    /**

     * Can we delete this?

     *

     * @return bool returns true if they can delete, false if not

     */

    public function can_delete() {

        $context = \context_course::instance($this->_courseid);

        return has_capability('tool/recyclebin:deleteitems', $context);

    }

}