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667 lines
26 KiB
667 lines
26 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Library to handle drag and drop course uploads
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*
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* @package core
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* @subpackage lib
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* @copyright 2012 Davo smith
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->dirroot.'/repository/lib.php');
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require_once($CFG->dirroot.'/repository/upload/lib.php');
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require_once($CFG->dirroot.'/course/lib.php');
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/**
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* Add the Javascript to enable drag and drop upload to a course page
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*
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* @param object $course The currently displayed course
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* @param array $modnames The list of enabled (visible) modules on this site
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* @return void
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*/
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function dndupload_add_to_course($course, $modnames) {
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global $CFG, $PAGE;
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$showstatus = optional_param('notifyeditingon', false, PARAM_BOOL);
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// Get all handlers.
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$handler = new dndupload_handler($course, $modnames);
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$jsdata = $handler->get_js_data();
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if (empty($jsdata->types) && empty($jsdata->filehandlers)) {
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return; // No valid handlers - don't enable drag and drop.
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}
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// Add the javascript to the page.
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$jsmodule = array(
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'name' => 'coursedndupload',
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'fullpath' => '/course/dndupload.js',
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'strings' => array(
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array('addfilehere', 'moodle'),
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array('dndworkingfiletextlink', 'moodle'),
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array('dndworkingfilelink', 'moodle'),
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array('dndworkingfiletext', 'moodle'),
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array('dndworkingfile', 'moodle'),
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array('dndworkingtextlink', 'moodle'),
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array('dndworkingtext', 'moodle'),
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array('dndworkinglink', 'moodle'),
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array('namedfiletoolarge', 'moodle'),
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array('actionchoice', 'moodle'),
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array('servererror', 'moodle'),
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array('filereaderror', 'moodle'),
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array('upload', 'moodle'),
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array('cancel', 'moodle'),
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array('changesmadereallygoaway', 'moodle')
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),
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'requires' => array('node', 'event', 'json', 'anim')
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);
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$vars = array(
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array('courseid' => $course->id,
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'maxbytes' => get_user_max_upload_file_size($PAGE->context, $CFG->maxbytes, $course->maxbytes),
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'handlers' => $handler->get_js_data(),
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'showstatus' => $showstatus)
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);
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$PAGE->requires->js_init_call('M.course_dndupload.init', $vars, true, $jsmodule);
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}
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/**
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* Stores all the information about the available dndupload handlers
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*
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* @package core
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* @copyright 2012 Davo Smith
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class dndupload_handler {
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/**
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* @var array A list of all registered mime types that can be dropped onto a course
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* along with the modules that will handle them.
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*/
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protected $types = array();
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/**
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* @var array A list of the different file types (extensions) that different modules
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* will handle.
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*/
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protected $filehandlers = array();
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/**
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* @var context_course|null
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*/
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protected $context = null;
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/**
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* Gather a list of dndupload handlers from the different mods
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*
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* @param object $course The course this is being added to (to check course_allowed_module() )
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*/
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public function __construct($course, $modnames = null) {
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global $CFG, $PAGE;
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// Add some default types to handle.
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// Note: 'Files' type is hard-coded into the Javascript as this needs to be ...
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// ... treated a little differently.
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$this->register_type('url', array('url', 'text/uri-list', 'text/x-moz-url'), get_string('addlinkhere', 'moodle'),
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get_string('nameforlink', 'moodle'), get_string('whatforlink', 'moodle'), 10);
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$this->register_type('text/html', array('text/html'), get_string('addpagehere', 'moodle'),
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get_string('nameforpage', 'moodle'), get_string('whatforpage', 'moodle'), 20);
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$this->register_type('text', array('text', 'text/plain'), get_string('addpagehere', 'moodle'),
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get_string('nameforpage', 'moodle'), get_string('whatforpage', 'moodle'), 30);
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$this->context = context_course::instance($course->id);
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// Loop through all modules to find handlers.
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$mods = get_plugin_list_with_function('mod', 'dndupload_register');
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foreach ($mods as $component => $funcname) {
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list($modtype, $modname) = core_component::normalize_component($component);
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if ($modnames && !array_key_exists($modname, $modnames)) {
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continue; // Module is deactivated (hidden) at the site level.
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}
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if (!course_allowed_module($course, $modname)) {
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continue; // User does not have permission to add this module to the course.
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}
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$resp = $funcname();
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if (!$resp) {
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continue;
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}
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if (isset($resp['files'])) {
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foreach ($resp['files'] as $file) {
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$this->register_file_handler($file['extension'], $modname, $file['message']);
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}
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}
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if (isset($resp['addtypes'])) {
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foreach ($resp['addtypes'] as $type) {
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if (isset($type['priority'])) {
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$priority = $type['priority'];
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} else {
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$priority = 100;
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}
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if (!isset($type['handlermessage'])) {
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$type['handlermessage'] = '';
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}
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$this->register_type($type['identifier'], $type['datatransfertypes'],
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$type['addmessage'], $type['namemessage'], $type['handlermessage'], $priority);
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}
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}
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if (isset($resp['types'])) {
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foreach ($resp['types'] as $type) {
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$noname = !empty($type['noname']);
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$this->register_type_handler($type['identifier'], $modname, $type['message'], $noname);
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}
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}
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$PAGE->requires->string_for_js('pluginname', $modname);
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}
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}
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/**
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* Used to add a new mime type that can be drag and dropped onto a
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* course displayed in a browser window
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*
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* @param string $identifier The name that this type will be known as
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* @param array $datatransfertypes An array of the different types in the browser
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* 'dataTransfer.types' object that will map to this type
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* @param string $addmessage The message to display in the browser when this type is being
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* dragged onto the page
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* @param string $namemessage The message to pop up when asking for the name to give the
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* course module instance when it is created
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* @param string $handlermessage The message to pop up when asking which module should handle this type
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* @param int $priority Controls the order in which types are checked by the browser (mainly
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* needed to check for 'text' last as that is usually given as fallback)
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*/
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protected function register_type($identifier, $datatransfertypes, $addmessage, $namemessage, $handlermessage, $priority=100) {
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if ($this->is_known_type($identifier)) {
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throw new coding_exception("Type $identifier is already registered");
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}
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$add = new stdClass;
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$add->identifier = $identifier;
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$add->datatransfertypes = $datatransfertypes;
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$add->addmessage = $addmessage;
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$add->namemessage = $namemessage;
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$add->handlermessage = $handlermessage;
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$add->priority = $priority;
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$add->handlers = array();
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$this->types[$identifier] = $add;
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}
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/**
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* Used to declare that a particular module will handle a particular type
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* of dropped data
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*
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* @param string $type The name of the type (as declared in register_type)
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* @param string $module The name of the module to handle this type
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* @param string $message The message to show the user if more than one handler is registered
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* for a type and the user needs to make a choice between them
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* @param bool $noname If true, the 'name' dialog should be disabled in the pop-up.
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* @throws coding_exception
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*/
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protected function register_type_handler($type, $module, $message, $noname) {
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if (!$this->is_known_type($type)) {
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throw new coding_exception("Trying to add handler for unknown type $type");
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}
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$add = new stdClass;
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$add->type = $type;
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$add->module = $module;
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$add->message = $message;
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$add->noname = $noname ? 1 : 0;
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$this->types[$type]->handlers[] = $add;
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}
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/**
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* Used to declare that a particular module will handle a particular type
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* of dropped file
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*
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* @param string $extension The file extension to handle ('*' for all types)
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* @param string $module The name of the module to handle this type
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* @param string $message The message to show the user if more than one handler is registered
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* for a type and the user needs to make a choice between them
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*/
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protected function register_file_handler($extension, $module, $message) {
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$extension = strtolower($extension);
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$add = new stdClass;
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$add->extension = $extension;
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$add->module = $module;
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$add->message = $message;
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$this->filehandlers[] = $add;
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}
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/**
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* Check to see if the type has been registered
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*
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* @param string $type The identifier of the type you are interested in
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* @return bool True if the type is registered
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*/
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public function is_known_type($type) {
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return array_key_exists($type, $this->types);
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}
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/**
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* Check to see if the module in question has registered to handle the
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* type given
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*
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* @param string $module The name of the module
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* @param string $type The identifier of the type
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* @return bool True if the module has registered to handle that type
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*/
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public function has_type_handler($module, $type) {
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if (!$this->is_known_type($type)) {
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throw new coding_exception("Checking for handler for unknown type $type");
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}
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foreach ($this->types[$type]->handlers as $handler) {
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if ($handler->module == $module) {
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return true;
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}
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}
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return false;
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}
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/**
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* Check to see if the module in question has registered to handle files
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* with the given extension (or to handle all file types)
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*
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* @param string $module The name of the module
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* @param string $extension The extension of the uploaded file
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* @return bool True if the module has registered to handle files with
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* that extension (or to handle all file types)
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*/
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public function has_file_handler($module, $extension) {
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foreach ($this->filehandlers as $handler) {
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if ($handler->module == $module) {
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if ($handler->extension == '*' || $handler->extension == $extension) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Gets a list of the file types that are handled by a particular module
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*
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* @param string $module The name of the module to check
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* @return array of file extensions or string '*'
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*/
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public function get_handled_file_types($module) {
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$types = array();
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foreach ($this->filehandlers as $handler) {
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if ($handler->module == $module) {
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if ($handler->extension == '*') {
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return '*';
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} else {
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// Prepending '.' as otherwise mimeinfo fails.
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$types[] = '.'.$handler->extension;
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}
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}
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}
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return $types;
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}
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/**
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* Returns an object to pass onto the javascript code with data about all the
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* registered file / type handlers
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*
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* @return object Data to pass on to Javascript code
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*/
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public function get_js_data() {
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global $CFG;
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$ret = new stdClass;
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// Sort the types by priority.
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uasort($this->types, array($this, 'type_compare'));
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$ret->types = array();
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if (!empty($CFG->dndallowtextandlinks)) {
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foreach ($this->types as $type) {
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if (empty($type->handlers)) {
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continue; // Skip any types without registered handlers.
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}
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$ret->types[] = $type;
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}
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}
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$ret->filehandlers = $this->filehandlers;
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$uploadrepo = repository::get_instances(array('type' => 'upload', 'currentcontext' => $this->context));
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if (empty($uploadrepo)) {
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$ret->filehandlers = array(); // No upload repo => no file handlers.
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}
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return $ret;
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}
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/**
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* Comparison function used when sorting types by priority
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* @param object $type1 first type to compare
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* @param object $type2 second type to compare
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* @return integer -1 for $type1 < $type2; 1 for $type1 > $type2; 0 for equal
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*/
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protected function type_compare($type1, $type2) {
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if ($type1->priority < $type2->priority) {
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return -1;
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}
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if ($type1->priority > $type2->priority) {
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return 1;
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}
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return 0;
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}
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}
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/**
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* Processes the upload, creating the course module and returning the result
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*
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* @package core
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* @copyright 2012 Davo Smith
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class dndupload_ajax_processor {
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/** Returned when no error has occurred */
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const ERROR_OK = 0;
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/** @var object The course that we are uploading to */
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protected $course = null;
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/** @var context_course The course context for capability checking */
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protected $context = null;
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/** @var int The section number we are uploading to */
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protected $section = null;
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/** @var string The type of upload (e.g. 'Files', 'text/plain') */
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protected $type = null;
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/** @var object The details of the module type that will be created */
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protected $module= null;
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/** @var object The course module that has been created */
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protected $cm = null;
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/** @var dndupload_handler used to check the allowed file types */
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protected $dnduploadhandler = null;
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/** @var string The name to give the new activity instance */
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protected $displayname = null;
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/**
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* Set up some basic information needed to handle the upload
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*
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* @param int $courseid The ID of the course we are uploading to
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* @param int $section The section number we are uploading to
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* @param string $type The type of upload (as reported by the browser)
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* @param string $modulename The name of the module requested to handle this upload
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*/
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public function __construct($courseid, $section, $type, $modulename) {
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global $DB;
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if (!defined('AJAX_SCRIPT')) {
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throw new coding_exception('dndupload_ajax_processor should only be used within AJAX requests');
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}
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$this->course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
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require_login($this->course, false);
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$this->context = context_course::instance($this->course->id);
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if (!is_number($section) || $section < 0) {
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throw new coding_exception("Invalid section number $section");
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}
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$this->section = $section;
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$this->type = $type;
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if (!$this->module = $DB->get_record('modules', array('name' => $modulename))) {
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throw new coding_exception("Module $modulename does not exist");
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}
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$this->dnduploadhandler = new dndupload_handler($this->course);
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}
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/**
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* Check if this upload is a 'file' upload
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*
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* @return bool true if it is a 'file' upload, false otherwise
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*/
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protected function is_file_upload() {
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return ($this->type == 'Files');
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}
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/**
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* Process the upload - creating the module in the course and returning the result to the browser
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*
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* @param string $displayname optional the name (from the browser) to give the course module instance
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* @param string $content optional the content of the upload (for non-file uploads)
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*/
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public function process($displayname = null, $content = null) {
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require_capability('moodle/course:manageactivities', $this->context);
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if ($this->is_file_upload()) {
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require_capability('moodle/course:managefiles', $this->context);
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if ($content != null) {
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throw new moodle_exception('fileuploadwithcontent', 'moodle');
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}
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} else {
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if (empty($content)) {
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throw new moodle_exception('dnduploadwithoutcontent', 'moodle');
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}
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}
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require_sesskey();
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$this->displayname = $displayname;
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if ($this->is_file_upload()) {
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$this->handle_file_upload();
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} else {
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$this->handle_other_upload($content);
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}
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}
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/**
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* Handle uploads containing files - create the course module, ask the upload repository
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* to process the file, ask the mod to set itself up, then return the result to the browser
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*/
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protected function handle_file_upload() {
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global $CFG;
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// Add the file to a draft file area.
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$draftitemid = file_get_unused_draft_itemid();
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$maxbytes = get_user_max_upload_file_size($this->context, $CFG->maxbytes, $this->course->maxbytes);
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$types = $this->dnduploadhandler->get_handled_file_types($this->module->name);
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$repo = repository::get_instances(array('type' => 'upload', 'currentcontext' => $this->context));
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if (empty($repo)) {
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throw new moodle_exception('errornouploadrepo', 'moodle');
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}
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$repo = reset($repo); // Get the first (and only) upload repo.
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$details = $repo->process_upload(null, $maxbytes, $types, '/', $draftitemid);
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if (empty($this->displayname)) {
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$this->displayname = $this->display_name_from_file($details['file']);
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}
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|
|
// Create a course module to hold the new instance.
|
|
$this->create_course_module();
|
|
|
|
// Ask the module to set itself up.
|
|
$moduledata = $this->prepare_module_data($draftitemid);
|
|
$instanceid = plugin_callback('mod', $this->module->name, 'dndupload', 'handle', array($moduledata), 'invalidfunction');
|
|
if ($instanceid === 'invalidfunction') {
|
|
throw new coding_exception("{$this->module->name} does not support drag and drop upload (missing {$this->module->name}_dndupload_handle function");
|
|
}
|
|
|
|
// Finish setting up the course module.
|
|
$this->finish_setup_course_module($instanceid);
|
|
}
|
|
|
|
/**
|
|
* Handle uploads not containing file - create the course module, ask the mod to
|
|
* set itself up, then return the result to the browser
|
|
*
|
|
* @param string $content the content uploaded to the browser
|
|
*/
|
|
protected function handle_other_upload($content) {
|
|
// Check this plugin is registered to handle this type of upload
|
|
if (!$this->dnduploadhandler->has_type_handler($this->module->name, $this->type)) {
|
|
$info = (object)array('modname' => $this->module->name, 'type' => $this->type);
|
|
throw new moodle_exception('moddoesnotsupporttype', 'moodle', $info);
|
|
}
|
|
|
|
// Create a course module to hold the new instance.
|
|
$this->create_course_module();
|
|
|
|
// Ask the module to set itself up.
|
|
$moduledata = $this->prepare_module_data(null, $content);
|
|
$instanceid = plugin_callback('mod', $this->module->name, 'dndupload', 'handle', array($moduledata), 'invalidfunction');
|
|
if ($instanceid === 'invalidfunction') {
|
|
throw new coding_exception("{$this->module->name} does not support drag and drop upload (missing {$this->module->name}_dndupload_handle function");
|
|
}
|
|
|
|
// Finish setting up the course module.
|
|
$this->finish_setup_course_module($instanceid);
|
|
}
|
|
|
|
/**
|
|
* Generate the name of the mod instance from the name of the file
|
|
* (remove the extension and convert underscore => space
|
|
*
|
|
* @param string $filename the filename of the uploaded file
|
|
* @return string the display name to use
|
|
*/
|
|
protected function display_name_from_file($filename) {
|
|
$pos = core_text::strrpos($filename, '.');
|
|
if ($pos) { // Want to skip if $pos === 0 OR $pos === false.
|
|
$filename = core_text::substr($filename, 0, $pos);
|
|
}
|
|
return str_replace('_', ' ', $filename);
|
|
}
|
|
|
|
/**
|
|
* Create the coursemodule to hold the file/content that has been uploaded
|
|
*/
|
|
protected function create_course_module() {
|
|
global $CFG;
|
|
require_once($CFG->dirroot.'/course/modlib.php');
|
|
list($module, $context, $cw, $cm, $data) = prepare_new_moduleinfo_data($this->course, $this->module->name, $this->section);
|
|
|
|
$data->coursemodule = $data->id = add_course_module($data);
|
|
$this->cm = $data;
|
|
}
|
|
|
|
/**
|
|
* Gather together all the details to pass on to the mod, so that it can initialise it's
|
|
* own database tables
|
|
*
|
|
* @param int $draftitemid optional the id of the draft area containing the file (for file uploads)
|
|
* @param string $content optional the content dropped onto the course (for non-file uploads)
|
|
* @return object data to pass on to the mod, containing:
|
|
* string $type the 'type' as registered with dndupload_handler (or 'Files')
|
|
* object $course the course the upload was for
|
|
* int $draftitemid optional the id of the draft area containing the files
|
|
* int $coursemodule id of the course module that has already been created
|
|
* string $displayname the name to use for this activity (can be overriden by the mod)
|
|
*/
|
|
protected function prepare_module_data($draftitemid = null, $content = null) {
|
|
$data = new stdClass();
|
|
$data->type = $this->type;
|
|
$data->course = $this->course;
|
|
if ($draftitemid) {
|
|
$data->draftitemid = $draftitemid;
|
|
} else if ($content) {
|
|
$data->content = $content;
|
|
}
|
|
$data->coursemodule = $this->cm->id;
|
|
$data->displayname = $this->displayname;
|
|
return $data;
|
|
}
|
|
|
|
/**
|
|
* Called after the mod has set itself up, to finish off any course module settings
|
|
* (set instance id, add to correct section, set visibility, etc.) and send the response
|
|
*
|
|
* @param int $instanceid id returned by the mod when it was created
|
|
*/
|
|
protected function finish_setup_course_module($instanceid) {
|
|
global $DB, $USER;
|
|
|
|
if (!$instanceid) {
|
|
// Something has gone wrong - undo everything we can.
|
|
course_delete_module($this->cm->id);
|
|
throw new moodle_exception('errorcreatingactivity', 'moodle', '', $this->module->name);
|
|
}
|
|
|
|
// Note the section visibility
|
|
$visible = get_fast_modinfo($this->course)->get_section_info($this->section)->visible;
|
|
|
|
$DB->set_field('course_modules', 'instance', $instanceid, array('id' => $this->cm->id));
|
|
// Rebuild the course cache after update action
|
|
rebuild_course_cache($this->course->id, true);
|
|
|
|
$sectionid = course_add_cm_to_section($this->course, $this->cm->id, $this->section);
|
|
|
|
set_coursemodule_visible($this->cm->id, $visible);
|
|
if (!$visible) {
|
|
$DB->set_field('course_modules', 'visibleold', 1, array('id' => $this->cm->id));
|
|
}
|
|
|
|
// retrieve the final info about this module.
|
|
$info = get_fast_modinfo($this->course);
|
|
if (!isset($info->cms[$this->cm->id])) {
|
|
// The course module has not been properly created in the course - undo everything.
|
|
course_delete_module($this->cm->id);
|
|
throw new moodle_exception('errorcreatingactivity', 'moodle', '', $this->module->name);
|
|
}
|
|
$mod = $info->get_cm($this->cm->id);
|
|
|
|
// Trigger course module created event.
|
|
$event = \core\event\course_module_created::create_from_cm($mod);
|
|
$event->trigger();
|
|
|
|
$this->send_response($mod);
|
|
}
|
|
|
|
/**
|
|
* Send the details of the newly created activity back to the client browser
|
|
*
|
|
* @param cm_info $mod details of the mod just created
|
|
*/
|
|
protected function send_response($mod) {
|
|
global $OUTPUT, $PAGE;
|
|
|
|
$resp = new stdClass();
|
|
$resp->error = self::ERROR_OK;
|
|
$resp->elementid = 'module-' . $mod->id;
|
|
|
|
$courserenderer = $PAGE->get_renderer('core', 'course');
|
|
$completioninfo = new completion_info($this->course);
|
|
$info = get_fast_modinfo($this->course);
|
|
$sr = null;
|
|
$modulehtml = $courserenderer->course_section_cm($this->course, $completioninfo,
|
|
$mod, null, array());
|
|
$resp->fullcontent = $courserenderer->course_section_cm_list_item($this->course, $completioninfo, $mod, $sr);
|
|
|
|
echo $OUTPUT->header();
|
|
echo json_encode($resp);
|
|
die();
|
|
}
|
|
}
|
|
|