/**
* Preview an asset
*
* @return array
**/
public function preview($id)
{
// Look up asset type from id
require_once dirname(__DIR__) . DS . 'asset.php';
$asset = new Asset($id);
// Classname
$class = __NAMESPACE__ . '\\' . ucfirst($asset->get('type'));
if ($class != __NAMESPACE__ . '\\' && class_exists($class) && method_exists($class, 'preview')) {
$object = $class::newWithoutHandlers($this->db);
return $object->preview($asset);
} else {
// Default edit page
return array('type' => 'default');
}
}
/**
* Deletes an asset file
*
* @apiMethod POST
* @apiUri /courses/asset/deletefile
* @apiParameter {
* "name": "id",
* "description": "ID of asset owning file",
* "type": "integer",
* "required": true,
* "default": null
* }
* @apiParameter {
* "name": "filename",
* "description": "Name of file to delete",
* "type": "string",
* "required": true,
* "default": null
* }
* @return void
*/
public function deletefileTask()
{
// Require authentication and authorization
$this->authorizeOrFail();
// Grab incoming id, if applicable
$id = Request::getInt('id', null);
$filename = Request::getVar('filename', null);
// Create our object
$asset = new Asset($id);
if ($asset->get('course_id') != $this->course->get('id')) {
App::abort(500, 'Asset is not a part of this course.');
}
$basePath = $asset->path($this->course->get('id'));
$path = $basePath . $filename;
$dirname = dirname($path);
if (!is_file(PATH_APP . $path) || $dirname != rtrim($basePath, DS)) {
App::abort(500, 'Illegal file path');
}
unlink(PATH_APP . $path);
// Return message
$this->send('File deleted');
}
/**
* Display an offering asset
*
* @return void
*/
public function assetTask()
{
$sparams = new Registry($this->course->offering()->section()->get('params'));
$section_id = $this->course->offering()->section()->get('id');
$asset = new Models\Asset(Request::getInt('asset_id', null));
$asset->set('section_id', $section_id);
// First, check if current user has access to course
if (!$this->course->offering()->access('view')) {
// Is a preview available?
$preview = $sparams->get('preview', 0);
// If no preview is available or if type is form (i.e. you can never preview forms)
if (!$preview || $asset->get('type') == 'form') {
// Check if they're logged in
if (User::isGuest()) {
$this->loginTask(Lang::txt('COM_COURSES_ENROLLMENT_REQUIRED_FOR_ASSET'));
return;
} else {
// Redirect back to the course outline
App::redirect(Route::url($this->course->offering()->link()), Lang::txt('COM_COURSES_ENROLLMENT_REQUIRED_FOR_ASSET'), 'warning');
return;
}
} elseif ($preview == 2) {
$units = $asset->units();
if ($units && count($units) > 0) {
foreach ($units as $unit) {
if ($unit->get('ordering') > 1) {
// Check if they're logged in
if (User::isGuest()) {
$this->loginTask(Lang::txt('COM_COURSES_ENROLLMENT_REQUIRED_FOR_ASSET'));
return;
} else {
// Redirect back to the course outline
App::redirect(Route::url($this->course->offering()->link()), Lang::txt('COM_COURSES_ENROLLMENT_REQUIRED_FOR_ASSET'), 'warning');
return;
}
}
}
}
}
}
// If not a manager and either the offering or section is unpublished...
if (!$this->course->offering()->access('manage') && (!$this->course->offering()->isPublished() || !$this->course->offering()->section()->isPublished())) {
return App::abort(403, Lang::txt('COM_COURSES_ERROR_ASSET_UNAVAILABLE'));
}
if (!$this->course->offering()->access('manage') && !$asset->isAvailable()) {
// Allow expired forms to pass through (i.e. so students can see their results)
if (!$asset->get('type') == 'form' || !$asset->ended()) {
// Redirect back to the course outline
App::redirect(Route::url($this->course->offering()->link()), Lang::txt('COM_COURSES_ERROR_ASSET_UNAVAILABLE'), 'warning');
return;
}
}
// Check prerequisites
$member = $this->course->offering()->section()->member(User::get('id'));
if (is_null($member->get('section_id'))) {
$member->set('section_id', $section_id);
}
$prerequisites = $member->prerequisites($this->course->offering()->gradebook());
if (!$this->course->offering()->access('manage') && !$prerequisites->hasMet('asset', $asset->get('id'))) {
$prereqs = $prerequisites->get('asset', $asset->get('id'));
$requirements = array();
foreach ($prereqs as $pre) {
$reqAsset = new Models\Asset($pre['scope_id']);
$requirements[] = $reqAsset->get('title');
}
$requirements = implode(', ', $requirements);
// Redirect back to the course outline
App::redirect(Route::url($this->course->offering()->link()), Lang::txt('COM_COURSES_ERROR_ASSET_HAS_PREREQ', $requirements), 'warning');
return;
}
// If requesting a file from a wiki type asset, then serve that up directly
if ($asset->get('subtype') == 'wiki' && Request::getVar('file', false)) {
echo $asset->download($this->course);
}
echo $asset->render($this->course);
}
/**
* See if item prerequisite has been fulfilled
*
* @TODO: For now, we're going to place all of the logic here for checking
* whether or not different types of items have been fulfilled.
* Eventually this should be abstracted out elsewhere.
*
* @return bool
**/
public function hasMet($scope, $scope_id)
{
$return = true;
switch ($scope) {
case 'unit':
$key = $scope . '.' . $scope_id;
if (isset($this->prerequisites[$key]) && count($this->prerequisites[$key]) > 0) {
foreach ($this->prerequisites[$key] as $prerequisite) {
if (!isset($this->progress[$this->member_id]) || !isset($this->progress[$this->member_id][$prerequisite['scope_id']]) || $this->progress[$this->member_id][$prerequisite['scope_id']]['percentage_complete'] != 100) {
$return = false;
continue;
}
}
}
break;
case 'asset':
$key = $scope . '.' . $scope_id;
if (isset($this->prerequisites[$key]) && count($this->prerequisites[$key]) > 0) {
foreach ($this->prerequisites[$key] as $prerequisite) {
$asset = new Asset($prerequisite['scope_id']);
switch ($asset->get('type')) {
case 'form':
if (!isset($this->grades[$prerequisite['scope_id']])) {
$return = false;
continue;
}
break;
default:
if (!isset($this->views[$this->member_id]) || !is_array($this->views[$this->member_id]) || !in_array($prerequisite['scope_id'], $this->views[$this->member_id])) {
$return = false;
continue;
}
break;
}
}
}
break;
}
return $return;
}