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<?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/>.
/**
* Library to handle drag and drop course uploads
*
* @package core
* @subpackage lib
* @copyright 2012 Davo smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot.'/repository/lib.php');
require_once($CFG->dirroot.'/repository/upload/lib.php');
require_once($CFG->dirroot.'/course/lib.php');
/**
* Add the Javascript to enable drag and drop upload to a course page
*
* @param object $course The currently displayed course
* @param array $modnames The list of enabled (visible) modules on this site
* @return void
*/
function dndupload_add_to_course($course, $modnames) {
global $CFG, $PAGE;
$showstatus = optional_param('notifyeditingon', false, PARAM_BOOL);
// Get all handlers.
$handler = new dndupload_handler($course, $modnames);
$jsdata = $handler->get_js_data();
if (empty($jsdata->types) && empty($jsdata->filehandlers)) {
return; // No valid handlers - don't enable drag and drop.
}
// Add the javascript to the page.
$jsmodule = array(
'name' => 'coursedndupload',
'fullpath' => '/course/dndupload.js',
'strings' => array(
array('addfilehere', 'moodle'),
array('dndworkingfiletextlink', 'moodle'),
array('dndworkingfilelink', 'moodle'),
array('dndworkingfiletext', 'moodle'),
array('dndworkingfile', 'moodle'),
array('dndworkingtextlink', 'moodle'),
array('dndworkingtext', 'moodle'),
array('dndworkinglink', 'moodle'),
array('namedfiletoolarge', 'moodle'),
array('actionchoice', 'moodle'),
array('servererror', 'moodle'),
array('filereaderror', 'moodle'),
array('upload', 'moodle'),
array('cancel', 'moodle'),
array('changesmadereallygoaway', 'moodle')
),
'requires' => array('node', 'event', 'json', 'anim')
);
$vars = array(
array('courseid' => $course->id,
'maxbytes' => get_user_max_upload_file_size($PAGE->context, $CFG->maxbytes, $course->maxbytes),
'handlers' => $handler->get_js_data(),
'showstatus' => $showstatus)
);
$PAGE->requires->js_init_call('M.course_dndupload.init', $vars, true, $jsmodule);
}
/**
* Stores all the information about the available dndupload handlers
*
* @package core
* @copyright 2012 Davo Smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class dndupload_handler {
/**
* @var array A list of all registered mime types that can be dropped onto a course
* along with the modules that will handle them.
*/
protected $types = array();
/**
* @var array A list of the different file types (extensions) that different modules
* will handle.
*/
protected $filehandlers = array();
/**
* @var context_course|null
*/
protected $context = null;
/**
* Gather a list of dndupload handlers from the different mods
*
* @param object $course The course this is being added to (to check course_allowed_module() )
*/
public function __construct($course, $modnames = null) {
global $CFG, $PAGE;
// Add some default types to handle.
// Note: 'Files' type is hard-coded into the Javascript as this needs to be ...
// ... treated a little differently.
$this->register_type('url', array('url', 'text/uri-list', 'text/x-moz-url'), get_string('addlinkhere', 'moodle'),
get_string('nameforlink', 'moodle'), get_string('whatforlink', 'moodle'), 10);
$this->register_type('text/html', array('text/html'), get_string('addpagehere', 'moodle'),
get_string('nameforpage', 'moodle'), get_string('whatforpage', 'moodle'), 20);
$this->register_type('text', array('text', 'text/plain'), get_string('addpagehere', 'moodle'),
get_string('nameforpage', 'moodle'), get_string('whatforpage', 'moodle'), 30);
$this->context = context_course::instance($course->id);
// Loop through all modules to find handlers.
$mods = get_plugin_list_with_function('mod', 'dndupload_register');
foreach ($mods as $component => $funcname) {
list($modtype, $modname) = core_component::normalize_component($component);
if ($modnames && !array_key_exists($modname, $modnames)) {
continue; // Module is deactivated (hidden) at the site level.
}
if (!course_allowed_module($course, $modname)) {
continue; // User does not have permission to add this module to the course.
}
$resp = $funcname();
if (!$resp) {
continue;
}
if (isset($resp['files'])) {
foreach ($resp['files'] as $file) {
$this->register_file_handler($file['extension'], $modname, $file['message']);
}
}
if (isset($resp['addtypes'])) {
foreach ($resp['addtypes'] as $type) {
if (isset($type['priority'])) {
$priority = $type['priority'];
} else {
$priority = 100;
}
if (!isset($type['handlermessage'])) {
$type['handlermessage'] = '';
}
$this->register_type($type['identifier'], $type['datatransfertypes'],
$type['addmessage'], $type['namemessage'], $type['handlermessage'], $priority);
}
}
if (isset($resp['types'])) {
foreach ($resp['types'] as $type) {
$noname = !empty($type['noname']);
$this->register_type_handler($type['identifier'], $modname, $type['message'], $noname);
}
}
$PAGE->requires->string_for_js('pluginname', $modname);
}
}
/**
* Used to add a new mime type that can be drag and dropped onto a
* course displayed in a browser window
*
* @param string $identifier The name that this type will be known as
* @param array $datatransfertypes An array of the different types in the browser
* 'dataTransfer.types' object that will map to this type
* @param string $addmessage The message to display in the browser when this type is being
* dragged onto the page
* @param string $namemessage The message to pop up when asking for the name to give the
* course module instance when it is created
* @param string $handlermessage The message to pop up when asking which module should handle this type
* @param int $priority Controls the order in which types are checked by the browser (mainly
* needed to check for 'text' last as that is usually given as fallback)
*/
protected function register_type($identifier, $datatransfertypes, $addmessage, $namemessage, $handlermessage, $priority=100) {
if ($this->is_known_type($identifier)) {
throw new coding_exception("Type $identifier is already registered");
}
$add = new stdClass;
$add->identifier = $identifier;
$add->datatransfertypes = $datatransfertypes;
$add->addmessage = $addmessage;
$add->namemessage = $namemessage;
$add->handlermessage = $handlermessage;
$add->priority = $priority;
$add->handlers = array();
$this->types[$identifier] = $add;
}
/**
* Used to declare that a particular module will handle a particular type
* of dropped data
*
* @param string $type The name of the type (as declared in register_type)
* @param string $module The name of the module to handle this type
* @param string $message The message to show the user if more than one handler is registered
* for a type and the user needs to make a choice between them
* @param bool $noname If true, the 'name' dialog should be disabled in the pop-up.
* @throws coding_exception
*/
protected function register_type_handler($type, $module, $message, $noname) {
if (!$this->is_known_type($type)) {
throw new coding_exception("Trying to add handler for unknown type $type");
}
$add = new stdClass;
$add->type = $type;
$add->module = $module;
$add->message = $message;
$add->noname = $noname ? 1 : 0;
$this->types[$type]->handlers[] = $add;
}
/**
* Used to declare that a particular module will handle a particular type
* of dropped file
*
* @param string $extension The file extension to handle ('*' for all types)
* @param string $module The name of the module to handle this type
* @param string $message The message to show the user if more than one handler is registered
* for a type and the user needs to make a choice between them
*/
protected function register_file_handler($extension, $module, $message) {
$extension = strtolower($extension);
$add = new stdClass;
$add->extension = $extension;
$add->module = $module;
$add->message = $message;
$this->filehandlers[] = $add;
}
/**
* Check to see if the type has been registered
*
* @param string $type The identifier of the type you are interested in
* @return bool True if the type is registered
*/
public function is_known_type($type) {
return array_key_exists($type, $this->types);
}
/**
* Check to see if the module in question has registered to handle the
* type given
*
* @param string $module The name of the module
* @param string $type The identifier of the type
* @return bool True if the module has registered to handle that type
*/
public function has_type_handler($module, $type) {
if (!$this->is_known_type($type)) {
throw new coding_exception("Checking for handler for unknown type $type");
}
foreach ($this->types[$type]->handlers as $handler) {
if ($handler->module == $module) {
return true;
}
}
return false;
}
/**
* Check to see if the module in question has registered to handle files
* with the given extension (or to handle all file types)
*
* @param string $module The name of the module
* @param string $extension The extension of the uploaded file
* @return bool True if the module has registered to handle files with
* that extension (or to handle all file types)
*/
public function has_file_handler($module, $extension) {
foreach ($this->filehandlers as $handler) {
if ($handler->module == $module) {
if ($handler->extension == '*' || $handler->extension == $extension) {
return true;
}
}
}
return false;
}
/**
* Gets a list of the file types that are handled by a particular module
*
* @param string $module The name of the module to check
* @return array of file extensions or string '*'
*/
public function get_handled_file_types($module) {
$types = array();
foreach ($this->filehandlers as $handler) {
if ($handler->module == $module) {
if ($handler->extension == '*') {
return '*';
} else {
// Prepending '.' as otherwise mimeinfo fails.
$types[] = '.'.$handler->extension;
}
}
}
return $types;
}
/**
* Returns an object to pass onto the javascript code with data about all the
* registered file / type handlers
*
* @return object Data to pass on to Javascript code
*/
public function get_js_data() {
global $CFG;
$ret = new stdClass;
// Sort the types by priority.
uasort($this->types, array($this, 'type_compare'));
$ret->types = array();
if (!empty($CFG->dndallowtextandlinks)) {
foreach ($this->types as $type) {
if (empty($type->handlers)) {
continue; // Skip any types without registered handlers.
}
$ret->types[] = $type;
}
}
$ret->filehandlers = $this->filehandlers;
$uploadrepo = repository::get_instances(array('type' => 'upload', 'currentcontext' => $this->context));
if (empty($uploadrepo)) {
$ret->filehandlers = array(); // No upload repo => no file handlers.
}
return $ret;
}
/**
* Comparison function used when sorting types by priority
* @param object $type1 first type to compare
* @param object $type2 second type to compare
* @return integer -1 for $type1 < $type2; 1 for $type1 > $type2; 0 for equal
*/
protected function type_compare($type1, $type2) {
if ($type1->priority < $type2->priority) {
return -1;
}
if ($type1->priority > $type2->priority) {
return 1;
}
return 0;
}
}
/**
* Processes the upload, creating the course module and returning the result
*
* @package core
* @copyright 2012 Davo Smith
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class dndupload_ajax_processor {
/** Returned when no error has occurred */
const ERROR_OK = 0;
/** @var object The course that we are uploading to */
protected $course = null;
/** @var context_course The course context for capability checking */
protected $context = null;
/** @var int The section number we are uploading to */
protected $section = null;
/** @var string The type of upload (e.g. 'Files', 'text/plain') */
protected $type = null;
/** @var object The details of the module type that will be created */
protected $module= null;
/** @var object The course module that has been created */
protected $cm = null;
/** @var dndupload_handler used to check the allowed file types */
protected $dnduploadhandler = null;
/** @var string The name to give the new activity instance */
protected $displayname = null;
/**
* Set up some basic information needed to handle the upload
*
* @param int $courseid The ID of the course we are uploading to
* @param int $section The section number we are uploading to
* @param string $type The type of upload (as reported by the browser)
* @param string $modulename The name of the module requested to handle this upload
*/
public function __construct($courseid, $section, $type, $modulename) {
global $DB;
if (!defined('AJAX_SCRIPT')) {
throw new coding_exception('dndupload_ajax_processor should only be used within AJAX requests');
}
$this->course = $DB->get_record('course', array('id' => $courseid), '*', MUST_EXIST);
require_login($this->course, false);
$this->context = context_course::instance($this->course->id);
if (!is_number($section) || $section < 0) {
throw new coding_exception("Invalid section number $section");
}
$this->section = $section;
$this->type = $type;
if (!$this->module = $DB->get_record('modules', array('name' => $modulename))) {
throw new coding_exception("Module $modulename does not exist");
}
$this->dnduploadhandler = new dndupload_handler($this->course);
}
/**
* Check if this upload is a 'file' upload
*
* @return bool true if it is a 'file' upload, false otherwise
*/
protected function is_file_upload() {
return ($this->type == 'Files');
}
/**
* Process the upload - creating the module in the course and returning the result to the browser
*
* @param string $displayname optional the name (from the browser) to give the course module instance
* @param string $content optional the content of the upload (for non-file uploads)
*/
public function process($displayname = null, $content = null) {
require_capability('moodle/course:manageactivities', $this->context);
if ($this->is_file_upload()) {
require_capability('moodle/course:managefiles', $this->context);
if ($content != null) {
throw new moodle_exception('fileuploadwithcontent', 'moodle');
}
} else {
if (empty($content)) {
throw new moodle_exception('dnduploadwithoutcontent', 'moodle');
}
}
require_sesskey();
$this->displayname = $displayname;
if ($this->is_file_upload()) {
$this->handle_file_upload();
} else {
$this->handle_other_upload($content);
}
}
/**
* Handle uploads containing files - create the course module, ask the upload repository
* to process the file, ask the mod to set itself up, then return the result to the browser
*/
protected function handle_file_upload() {
global $CFG;
// Add the file to a draft file area.
$draftitemid = file_get_unused_draft_itemid();
$maxbytes = get_user_max_upload_file_size($this->context, $CFG->maxbytes, $this->course->maxbytes);
$types = $this->dnduploadhandler->get_handled_file_types($this->module->name);
$repo = repository::get_instances(array('type' => 'upload', 'currentcontext' => $this->context));
if (empty($repo)) {
throw new moodle_exception('errornouploadrepo', 'moodle');
}
$repo = reset($repo); // Get the first (and only) upload repo.
$details = $repo->process_upload(null, $maxbytes, $types, '/', $draftitemid);
if (empty($this->displayname)) {
$this->displayname = $this->display_name_from_file($details['file']);
}
// 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();
}
}