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/>.

/**

 * Save and load draft text while a user is still editing a form.

 *

 * @package    editor_atto

 * @copyright  2014 Damyon Wiese

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

 */

define('AJAX_SCRIPT', true);

require_once(__DIR__ . '/../../../config.php');

require_once($CFG->libdir . '/filestorage/file_storage.php');

// Clean up actions.

$actions = array_map(function($actionparams) {

    $action = isset($actionparams['action']) ? $actionparams['action'] : null;

    $params = [];

    $keys = [

        'action' => PARAM_ALPHA,

        'contextid' => PARAM_INT,

        'elementid' => PARAM_ALPHANUMEXT,

        'pagehash' => PARAM_ALPHANUMEXT,

        'pageinstance' => PARAM_ALPHANUMEXT

    ];

    if ($action == 'save') {

        $keys['drafttext'] = PARAM_RAW;

    } else if ($action == 'resume') {

        $keys['draftid'] = PARAM_INT;

    }

    foreach ($keys as $key => $type) {

        // Replicate required_param().

        if (!isset($actionparams[$key])) {

            throw new \moodle_exception('missingparam', '', '', $key);

        }

        $params[$key] = clean_param($actionparams[$key], $type);

    }

    return $params;

}, isset($_REQUEST['actions']) ? $_REQUEST['actions'] : []);

$now = time();

// This is the oldest time any autosave text will be recovered from.

// This is so that there is a good chance the draft files will still exist (there are many variables so

// this is impossible to guarantee).

$before = $now - 60*60*24*4;

$context = context_system::instance();

$PAGE->set_url('/lib/editor/atto/autosave-ajax.php');

$PAGE->set_context($context);

require_login();

if (isguestuser()) {

    throw new \moodle_exception('accessdenied', 'admin');

}

require_sesskey();

if (!in_array('atto', explode(',', get_config('core', 'texteditors')))) {

    throw new \moodle_exception('accessdenied', 'admin');

}

$responses = array();

foreach ($actions as $actionparams) {

    $action = $actionparams['action'];

    $contextid = $actionparams['contextid'];

    $elementid = $actionparams['elementid'];

    $pagehash = $actionparams['pagehash'];

    $pageinstance = $actionparams['pageinstance'];

    if ($action === 'save') {

        $drafttext = $actionparams['drafttext'];

        $params = array('elementid' => $elementid,

                        'userid' => $USER->id,

                        'pagehash' => $pagehash,

                        'contextid' => $contextid);

        $record = $DB->get_record('editor_atto_autosave', $params);

        if ($record && $record->pageinstance != $pageinstance) {

            throw new \moodle_exception('concurrent access from the same user is not supported');

            die();

        }

        if (!$record) {

            $record = new stdClass();

            $record->elementid = $elementid;

            $record->userid = $USER->id;

            $record->pagehash = $pagehash;

            $record->contextid = $contextid;

            $record->drafttext = $drafttext;

            $record->pageinstance = $pageinstance;

            $record->timemodified = $now;

            $DB->insert_record('editor_atto_autosave', $record);

            // No response means no error.

            $responses[] = null;

            continue;

        } else {

            $record->drafttext = $drafttext;

            $record->timemodified = time();

            $DB->update_record('editor_atto_autosave', $record);

            // No response means no error.

            $responses[] = null;

            continue;

        }

    } else if ($action == 'resume') {

        $params = array('elementid' => $elementid,

                        'userid' => $USER->id,

                        'pagehash' => $pagehash,

                        'contextid' => $contextid);

        $newdraftid = $actionparams['draftid'];

        $record = $DB->get_record('editor_atto_autosave', $params);

        if (!$record) {

            $record = new stdClass();

            $record->elementid = $elementid;

            $record->userid = $USER->id;

            $record->pagehash = $pagehash;

            $record->contextid = $contextid;

            $record->pageinstance = $pageinstance;

            $record->pagehash = $pagehash;

            $record->draftid = $newdraftid;

            $record->timemodified = time();

            $record->drafttext = '';

            $DB->insert_record('editor_atto_autosave', $record);

            // No response means no error.

            $responses[] = null;

            continue;

        } else {

            // Copy all draft files from the old draft area.

            $usercontext = context_user::instance($USER->id);

            $stale = $record->timemodified < $before;

            require_once($CFG->libdir . '/filelib.php');

            $fs = get_file_storage();

            $files = $fs->get_directory_files($usercontext->id, 'user', 'draft', $newdraftid, '/', true, true);

            $lastfilemodified = 0;

            foreach ($files as $file) {

                $lastfilemodified = max($lastfilemodified, $file->get_timemodified());

            }

            if ($record->timemodified < $lastfilemodified) {

                $stale = true;

            }

            if (!$stale) {

                // This function copies all the files in one draft area, to another area (in this case it's

                // another draft area). It also rewrites the text to @@PLUGINFILE@@ links.

                $newdrafttext = file_save_draft_area_files($record->draftid,

                                                           $usercontext->id,

                                                           'user',

                                                           'draft',

                                                           $newdraftid,

                                                           array(),

                                                           $record->drafttext);

                // Final rewrite to the new draft area (convert the @@PLUGINFILES@@ again).

                $newdrafttext = file_rewrite_pluginfile_urls($newdrafttext,

                                                             'draftfile.php',

                                                             $usercontext->id,

                                                             'user',

                                                             'draft',

                                                             $newdraftid);

                $record->drafttext = $newdrafttext;

                $record->pageinstance = $pageinstance;

                $record->draftid = $newdraftid;

                $record->timemodified = time();

                $DB->update_record('editor_atto_autosave', $record);

                // A response means the draft has been restored and here is the auto-saved text.

                $response = ['result' => $record->drafttext];

                $responses[] = $response;

            } else {

                $DB->delete_records('editor_atto_autosave', array('id' => $record->id));

                // No response means no error.

                $responses[] = null;

            }

            continue;

        }

    } else if ($action == 'reset') {

        $params = array('elementid' => $elementid,

                        'userid' => $USER->id,

                        'pagehash' => $pagehash,

                        'contextid' => $contextid);

        $DB->delete_records('editor_atto_autosave', $params);

        $responses[] = null;

        continue;

    }

}

echo json_encode($responses);