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<?php
namespace App\Traits;
use Illuminate\Http\UploadedFile;
use Peopleaps\Scorm\Exception\InvalidScormArchiveException;
use Peopleaps\Scorm\Model\ScormModel;
use Illuminate\Support\Str;
use DOMDocument;
use Illuminate\Support\Facades\File;
use Peopleaps\Scorm\Exception\StorageNotFoundException;
use Peopleaps\Scorm\Manager\ScormDisk;
use Illuminate\Support\Facades\Storage;
trait AicciManager
{
/** @var ScormDisk */
private $scormDisk;
/** @var string $uuid */
private $uuid;
/**
* @param UploadedFile $file
* @param null|string $uuid
* @return ScormModel
* @throws InvalidScormArchiveException
*/
public function uploadScormArchive(UploadedFile $file, $uuid = null)
{
// $uuid is meant for user to update scorm content. Hence, if user want to update content should parse in existing uuid
if (!empty($uuid)) {
$this->uuid = $uuid;
} else {
$this->uuid = Str::uuid();
}
return $this->saveScorm($file, $file->getClientOriginalName(), $uuid);
}
/**
* Checks if it is a valid scorm archive
*
* @param string|UploadedFile $file zip.
*/
private function validatePackage($file)
{
$zip = new \ZipArchive();
$openValue = $zip->open($file);
$isScormArchive = (true === $openValue);
$zip->close();
if (!$isScormArchive) {
$this->onError('invalid_archive_message');
}
}
/**
* Save scorm data
*
* @param string|UploadedFile $file zip.
* @param string $filename
* @param null|string $uuid
* @return ScormModel
* @throws InvalidScormArchiveException
*/
private function saveScorm($file, $filename, $uuid = null)
{
$this->scormDisk = new ScormDisk();
$this->validatePackage($file);
$scormData = $this->generateScorm($file);
// save to db
if (is_null($scormData) || !is_array($scormData)) {
$this->onError('invalid_scorm_data');
}
// This uuid is use when the admin wants to edit existing scorm file.
if (!empty($uuid)) {
$this->uuid = $uuid; // Overwrite system generated uuid
}
/**
* ScormModel::whereUuid Query Builder style equals ScormModel::where('uuid',$value)
*
* From Laravel doc https://laravel.com/docs/5.0/queries#advanced-wheres.
* Dynamic Where Clauses
* You may even use "dynamic" where statements to fluently build where statements using magic methods:
*
* Examples:
*
* $admin = DB::table('users')->whereId(1)->first();
* From laravel framework https://github.com/laravel/framework/blob/9.x/src/Illuminate/Database/Query/Builder.php'
* Handle dynamic method calls into the method.
* return $this->dynamicWhere($method, $parameters);
**/
// Uuid indicator is better than filename for update content or add new content.
$scorm = ScormModel::whereUuid($this->uuid);
// Check if scom package already exists to drop old one.
if (!$scorm->exists()) {
$scorm = new ScormModel();
} else {
$scorm = $scorm->first();
$this->deleteScormData($scorm);
$scorm->delete();
}
$scorm->uuid = $this->uuid;
$scorm->title = $scormData['title'];
$scorm->version = $scormData['version'];
$scorm->entry_url = $scormData['entryUrl'];
$scorm->identifier = $scormData['identifier'];
$scorm->origin_file = $filename;
$scorm->save();
return $scorm;
}
private function deleteScormData($model)
{
// Delete after the previous item is stored
$oldScos = $model->scos()->get();
// Delete all tracking associate with sco
foreach ($oldScos as $oldSco) {
$oldSco->scoTrackings()->delete();
}
$model->scos()->delete(); // delete scos
// Delete folder from server
// $this->deleteScormFolder($model->uuid);
}
/**
* @param $folderHashedName
* @return bool
*/
protected function deleteScormFolder($folderHashedName)
{
return $this->scormDisk->deleteScorm($folderHashedName);
}
/**
* @param string|UploadedFile $file zip.
*/
private function parseScormArchive($file)
{
$version = 'SCORM';
$zip = new \ZipArchive();
$openValue = $zip->open($file);
$isScormArchive = (true === $openValue) && $zip->getStream('tincan.xml');
$version = ($isScormArchive) ? 'xAPI' : $version;
$isScormArchive = (true === $openValue) && $zip->getStream('cmi5.xml');
$version = ($isScormArchive) ? 'cmi5' : $version;
$isScormArchive = (true === $openValue) && $zip->getStream('course.au');
$version = ($isScormArchive) ? 'AICCI' : $version;
if ($version == 'AICCI') {
$contents = '';
$stream = $zip->getStream('course.au');
while (!feof($stream)) {
$contents .= fread($stream, 2);
}
$dom = new DOMDocument();
if (!$dom->loadHTML($contents)) {
$this->onError('cannot_load_imsmanifest_message');
}
$entryUrl = explode(",", $contents)[14];
} elseif ($version == 'xAPI') {
$contents = '';
$stream = $zip->getStream('tincan.xml');
while (!feof($stream)) {
$contents .= fread($stream, 2);
}
$dom = new DOMDocument();
if (!$dom->loadXML($contents)) {
$this->onError('cannot_load_imsmanifest_message');
}
$entryUrl = $dom->getElementsByTagName('launch')->item(0)->nodeValue;
} elseif ($version == 'cmi5') {
$contents = '';
$stream = $zip->getStream('cmi5.xml');
while (!feof($stream)) {
$contents .= fread($stream, 2);
}
$dom = new DOMDocument();
if (!$dom->loadXML($contents)) {
$this->onError('cannot_load_imsmanifest_message');
}
$entryUrl = $dom->getElementsByTagName('url')->item(0)->nodeValue;
}
$zip->close();
$data = [];
$data['identifier'] = rand();
$data['uuid'] = $this->uuid;
$data['title'] = basename($file, ".php"); // to follow standard file data format
$data['version'] = $version;
$data['entryUrl'] = str_replace('"', "", $entryUrl);
return $data;
}
/**
* @param string|UploadedFile $file zip.
* @return array
* @throws InvalidScormArchiveException
*/
private function generateScorm($file)
{
$scormData = $this->parseScormArchive($file);
/**
* Unzip a given ZIP file into the web resources directory.
*
* @param string $hashName name of the destination directory
*/
$scorm = ScormModel::whereUuid($this->uuid);
if ($scorm->exists()) {
$this->deleteScormFolder($this->uuid);
}
$this->scormDisk->unzipper($file, $this->uuid);
return [
'identifier' => $scormData['identifier'],
'uuid' => $this->uuid,
'title' => $scormData['title'], // to follow standard file data format
'version' => $scormData['version'],
'entryUrl' => $scormData['entryUrl'],
];
}
/**
* Clean resources and throw exception.
*/
private function onError($msg)
{
$this->scormDisk->deleteScorm($this->uuid);
throw new InvalidScormArchiveException($msg);
}
/**
* @return FilesystemAdapter $disk
*/
private function getArchiveDisk()
{
if (!config()->has('filesystems.disks.' . config('scorm.archive'))) {
throw new StorageNotFoundException('scorm_archive_disk_not_define');
}
return Storage::disk(config('scorm.archive'));
}
}