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/>.

/**

 * @package    moodlecore

 * @subpackage backup-dbops

 * @copyright  2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}

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

 */

/**

 * Non instantiable helper class providing DB support to the @backup_plan class

 *

 * This class contains various static methods available for all the DB operations

 * performed by the @backup_plan (and builder) classes

 *

 * TODO: Finish phpdocs

 */

abstract class backup_plan_dbops extends backup_dbops {

    /**

     * Given one course module id, return one array with all the block intances that belong to it

     */

    public static function get_blockids_from_moduleid($moduleid) {

        global $DB;

        // Get the context of the module

        $contextid = context_module::instance($moduleid)->id;

        // Get all the block instances which parentcontextid is the module contextid

        $blockids = array();

        $instances = $DB->get_records('block_instances', array('parentcontextid' => $contextid), '', 'id');

        foreach ($instances as $instance) {

            $blockids[] = $instance->id;

        }

        return $blockids;

    }

    /**

     * Given one course id, return one array with all the block intances that belong to it

     */

    public static function get_blockids_from_courseid($courseid) {

        global $DB;

        // Get the context of the course

        $contextid = context_course::instance($courseid)->id;

        // Get all the block instances which parentcontextid is the course contextid

        $blockids = array();

        $instances = $DB->get_records('block_instances', array('parentcontextid' => $contextid), '', 'id');

        foreach ($instances as $instance) {

            $blockids[] = $instance->id;

        }

        return $blockids;

    }

    /**

     * Given one section id, return one array with all the course modules that belong to it

     */

    public static function get_modules_from_sectionid($sectionid) {

        global $DB;

        // Get the course and sequence of the section

        $secrec = $DB->get_record('course_sections', array('id' => $sectionid), 'course, sequence');

        $courseid = $secrec->course;

        $sequence = $secrec->sequence;

        // Get the section->sequence contents (it roots the activities order)

        // Get all course modules belonging to requested section

        $modulesarr = array();

        $modules = $DB->get_records_sql("

            SELECT cm.id, m.name AS modname

              FROM {course_modules} cm

              JOIN {modules} m ON m.id = cm.module

             WHERE cm.course = ?

               AND cm.section = ?

               AND cm.deletioninprogress <> 1", array($courseid, $sectionid));

        foreach (explode(',', $sequence) as $moduleid) {

            if (isset($modules[$moduleid])) {

                $module = array('id' => $modules[$moduleid]->id, 'modname' => $modules[$moduleid]->modname);

                $modulesarr[] = (object)$module;

                unset($modules[$moduleid]);

            }

        }

        if (!empty($modules)) { // This shouldn't happen, but one borked sequence can lead to it. Add the rest

            foreach ($modules as $module) {

                $module = array('id' => $module->id, 'modname' => $module->modname);

                $modulesarr[] = (object)$module;

            }

        }

        return $modulesarr;

    }

    /**

     * Given one course id, return one array with all the course_sections belonging to it

     */

    public static function get_sections_from_courseid($courseid) {

        global $DB;

        // Get all sections belonging to requested course

        $sectionsarr = array();

        $sections = $DB->get_records('course_sections', array('course' => $courseid), 'section');

        foreach ($sections as $section) {

            $sectionsarr[] = $section->id;

        }

        return $sectionsarr;

    }

    /**

     * Given one course id, return its format in DB

     */

    public static function get_courseformat_from_courseid($courseid) {

        global $DB;

        return $DB->get_field('course', 'format', array('id' => $courseid));

    }

    /**

     * Given a course id, returns its theme. This can either be the course

     * theme or (if not specified in course) the category, site theme.

     *

     * User, session, and inherited-from-mnet themes cannot have backed-up

     * per course data. This is course-related data so it must be in a course

     * theme specified as part of the course structure

     * @param int $courseid

     * @return string Name of course theme

     * @see moodle_page#resolve_theme()

     */

    public static function get_theme_from_courseid($courseid) {

        global $DB, $CFG;

        // Course theme first

        if (!empty($CFG->allowcoursethemes)) {

            $theme = $DB->get_field('course', 'theme', array('id' => $courseid));

            if ($theme) {

                return $theme;

            }

        }

        // Category themes in reverse order

        if (!empty($CFG->allowcategorythemes)) {

            $catid = $DB->get_field('course', 'category', array('id' => $courseid));

            while($catid) {

                $category = $DB->get_record('course_categories', array('id'=>$catid),

                        'theme,parent', MUST_EXIST);

                if ($category->theme) {

                    return $category->theme;

                }

                $catid = $category->parent;

            }

        }

        // Finally use site theme

        return $CFG->theme;

    }

    /**

     * Return the wwwroot of the $CFG->mnet_localhost_id host

     * caching it along the request

     */

    public static function get_mnet_localhost_wwwroot() {

        global $CFG, $DB;

        static $wwwroot = null;

        if (is_null($wwwroot)) {

            $wwwroot = $DB->get_field('mnet_host', 'wwwroot', array('id' => $CFG->mnet_localhost_id));

        }

        return $wwwroot;

    }

    /**

    * Returns the default backup filename, based in passed params.

    *

    * Default format is (see MDL-22145)

    * backup word - format - type - name - date - info . mbz

    * where name is variable (course shortname, section name/id, activity modulename + cmid)

    * and info can be (nu = no user info, an = anonymized). The last param $useidasname,

    * defaulting to false, allows to replace the course shortname by the course id (used

    * by automated backups, to avoid non-ascii chars in OS filesystem)

    *

    * @param string $format One of backup::FORMAT_

    * @param string $type One of backup::TYPE_

    * @param int $courseid/$sectionid/$cmid

    * @param bool $users Should be true is users were included in the backup

    * @param bool $anonymised Should be true is user information was anonymized.

    * @param bool $useidonly only use the ID in the file name

    * @return string The filename to use

    */

    public static function get_default_backup_filename($format, $type, $id, $users, $anonymised,

            $useidonly = false, $files = true) {

        global $DB;

        // Calculate backup word

        $backupword = str_replace(' ', '_', core_text::strtolower(get_string('backupfilename')));

        $backupword = trim(clean_filename($backupword), '_');

        // Not $useidonly, lets fetch the name

        $shortname = '';

        if (!$useidonly) {

            // Calculate proper name element (based on type)

            switch ($type) {

                case backup::TYPE_1COURSE:

                    $shortname = $DB->get_field('course', 'shortname', array('id' => $id));

                    $context = context_course::instance($id);

                    $shortname = format_string($shortname, true, array('context' => $context));

                    break;

                case backup::TYPE_1SECTION:

                    if (!$shortname = $DB->get_field('course_sections', 'name', array('id' => $id))) {

                        $shortname = $DB->get_field('course_sections', 'section', array('id' => $id));

                    }

                    break;

                case backup::TYPE_1ACTIVITY:

                    $cm = get_coursemodule_from_id(null, $id);

                    $shortname = $cm->modname . $id;

                    break;

            }

            $shortname = str_replace(' ', '_', $shortname);

            $shortname = core_text::strtolower(trim(clean_filename($shortname), '_'));

        }

        // The name will always contain the ID, but we append the course short name if requested.

        $name = $id;

        if (!$useidonly && $shortname != '') {

            $name .= '-' . $shortname;

        }

        // Calculate date

        $backupdateformat = str_replace(' ', '_', get_string('backupnameformat', 'langconfig'));

        $date = userdate(time(), $backupdateformat, 99, false);

        $date = core_text::strtolower(trim(clean_filename($date), '_'));

        // Calculate info

        $info = '';

        if (!$users) {

            $info = '-nu';

        } else if ($anonymised) {

            $info = '-an';

        }

        // Indicate if backup doesn't contain files.

        if (!$files) {

            $info .= '-nf';

        }

        return $backupword . '-' . $format . '-' . $type . '-' .

               $name . '-' . $date . $info . '.mbz';

    }

    /**

    * Returns a flag indicating the need to backup gradebook elements like calculated grade items and category visibility

    * If all activity related grade items are being backed up we can also backup calculated grade items and categories

    */

    public static function require_gradebook_backup($courseid, $backupid) {

        global $DB;

        $sql = "SELECT count(id)

                  FROM {grade_items}

                 WHERE courseid=:courseid

                   AND itemtype = 'mod'

                   AND id NOT IN (

                       SELECT bi.itemid

                         FROM {backup_ids_temp} bi

                        WHERE bi.itemname = 'grade_itemfinal'

                          AND bi.backupid = :backupid)";

        $params = array('courseid'=>$courseid, 'backupid'=>$backupid);

        $count = $DB->count_records_sql($sql, $params);

        //if there are 0 activity grade items not already included in the backup

        return $count == 0;

    }

}