How to retrieve draft grade from Google Classroom using api in php - google-api

Question

I want to read draft grade marks from Google Classroom using API for a project. But I can't find out the draft grade. Already I've added some code to the quickstart.php file:
require __DIR__ . '/vendor/autoload.php';
// if (php_sapi_name() != 'cli') {
// throw new Exception('This application must be run on the command line.');
// }
/**
* Returns an authorized API client.
* #return Google_Client the authorized client object
*/
function getClient()
{
$client = new Google_Client();
$client->setApplicationName('Google Classroom API PHP Quickstart');
$client->setScopes(array(
Google_Service_Classroom::CLASSROOM_COURSES,
Google_Service_Classroom::CLASSROOM_STUDENT_SUBMISSIONS_STUDENTS_READONLY,
Google_Service_Classroom::CLASSROOM_ROSTERS)
);
$client->setAuthConfig(__DIR__ .'/credentials.json');
$client->setAccessType('offline');
$client->setPrompt('select_account consent');
// Load previously authorized token from a file, if it exists.
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
$tokenPath = 'token.json';
if (file_exists($tokenPath)) {
$accessToken = json_decode(file_get_contents($tokenPath), true);
$client->setAccessToken($accessToken);
}
// If there is no previous token or it's expired.
if ($client->isAccessTokenExpired()) {
// Refresh the token if possible, else fetch a new one.
if ($client->getRefreshToken()) {
$client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
} else {
// Request authorization from the user.
$authUrl = $client->createAuthUrl();
printf("Open the following link in your browser:\n%s\n", $authUrl);
print 'Enter verification code: ';
$authCode = trim(fgets(STDIN));
// Exchange authorization code for an access token.
$accessToken = $client->fetchAccessTokenWithAuthCode($authCode);
$client->setAccessToken($accessToken);
// Check to see if there was an error.
if (array_key_exists('error', $accessToken)) {
throw new Exception(join(', ', $accessToken));
}
}
// Save the token to a file.
if (!file_exists(dirname($tokenPath))) {
mkdir(dirname($tokenPath), 0700, true);
}
file_put_contents($tokenPath, json_encode($client->getAccessToken()));
}
return $client;
}
$optParams = array(
'pageSize' => 1000
);
// Copyright 2021 Google LLC.
// SPDX-License-Identifier: Apache-2.0
// Get the API client and construct the service object.
$client = getClient();
$service = new Google_Service_Classroom($client);
// set these parameters:
// 328776504166 <- It is my course id
// 339429593407 <- It is my course work id
$courseId = "328776504166";
$courseWorkId = "339429593407";
$results = $service->courses_courseWork_studentSubmissions->listCoursesCourseWorkStudentSubmissions($courseId, $courseWorkId);
foreach ($results->studentSubmissions as $r => $submission) {
$student = $service->courses_students->get($courseId, $submission->userId);
$studentName = $student->profile->name->fullName;
print("<br>Student Name: ".$studentName . ": ");
print("<br>Draft Grade: ".$submission->draftGrade. "\n");
print("<br>Course Work Id: ".$submission->courseWorkId. "\n");
echo '<pre>';
print_r($submission);
}
Then when I run quickstart.php at localhost the following problems can be seen:
Fatal error: Uncaught Google_Service_Exception: { "error": { "code": 400, "message": "Precondition check failed.", "errors": [ { "message": "Precondition check failed.", "domain": "global", "reason": "failedPrecondition" } ], "status": "FAILED_PRECONDITION" } } in C:\xampp\htdocs\api\vendor\google\apiclient\src\Google\Http\REST.php:118 Stack trace: #0
I can't find my wrong. How to solve this problem? please give me some suggestions.

Answer 1

As stated in the documentation:
Students cannot see draft grades
This is why a student who intents to retrieve a draft grade will obtain a
403 - "Insufficient Permission" error.