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/>.

/**

 * This file contains the version information for the comments feedback plugin

 *

 * @package assignfeedback_editpdf

 * @copyright  2012 Davo Smith

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

 */

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

global $CFG;

require_once($CFG->dirroot . '/mod/assign/locallib.php');

/**

 * Serves assignment feedback and other files.

 *

 * @param mixed $course course or id of the course

 * @param mixed $cm course module or id of the course module

 * @param context $context

 * @param string $filearea

 * @param array $args

 * @param bool $forcedownload

 * @param array $options - List of options affecting file serving.

 * @return bool false if file not found, does not return if found - just send the file

 */

function assignfeedback_editpdf_pluginfile(

    $course,

    $cm,

    context $context,

    $filearea,

    $args,

    $forcedownload,

    array $options = array()

) {

    global $DB;

    if ($filearea === 'systemstamps') {

        if ($context->contextlevel !== CONTEXT_SYSTEM) {

            return false;

        }

        $filename = array_pop($args);

        $filepath = '/' . implode('/', $args) . '/';

        $fs = get_file_storage();

        $file = $fs->get_file($context->id, 'assignfeedback_editpdf', $filearea, 0, $filepath, $filename);

        if (!$file) {

            return false;

        }

        $options['cacheability'] = 'public';

        $options['immutable'] = true;

        send_stored_file($file, null, 0, false, $options);

    }

    if ($context->contextlevel == CONTEXT_MODULE) {

        require_login($course, false, $cm);

        $itemid = (int)array_shift($args);

        $assign = new assign($context, $cm, $course);

        $record = $DB->get_record('assign_grades', array('id' => $itemid), 'userid,assignment', MUST_EXIST);

        $userid = $record->userid;

        if ($assign->get_instance()->id != $record->assignment) {

            return false;

        }

        // Rely on mod_assign checking permissions.

        if (!$assign->can_view_submission($userid)) {

            return false;

        }

        $relativepath = implode('/', $args);

        $fullpath = "/{$context->id}/assignfeedback_editpdf/$filearea/$itemid/$relativepath";

        $fs = get_file_storage();

        if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {

            return false;

        }

        // Download MUST be forced - security!

        send_stored_file($file, 0, 0, true, $options);// Check if we want to retrieve the stamps.

    }

}

/**

 * Files API hook to remove stale conversion records.

 *

 * When a file is update, its contenthash will change, but its ID

 * remains the same. The document converter API records source file

 * IDs and destination file IDs. When a file is updated, the document

 * converter API has no way of knowing that the content of the file

 * has changed, so it just serves the previously stored destination

 * file.

 *

 * In this hook we check if the contenthash has changed, and if it has

 * we delete the existing conversion so that a new one will be created.

 *

 * @param stdClass $file The updated file record.

 * @param stdClass $filepreupdate The file record pre-update.

 */

function assignfeedback_editpdf_after_file_updated(stdClass $file, stdClass $filepreupdate) {

    $contenthashchanged = $file->contenthash !== $filepreupdate->contenthash;

    if ($contenthashchanged && $file->component == 'assignsubmission_file' && $file->filearea == 'submission_files') {

        $fs = get_file_storage();

        $file = $fs->get_file_by_id($file->id);

        $conversions = \core_files\conversion::get_conversions_for_file($file, 'pdf');

        foreach ($conversions as $conversion) {

            if ($conversion->get('id')) {

                $conversion->delete();

            }

        }

    }

}