Unable to create events for different user in Google calendar - php

Question

Hi everyone.
I hope you all are doing well.
I know this question has been asked many times but non of the solutions provided there worked for me.
I am implementing google calendar API in custom PHP. I have followed the official documentation provided by Google. I have been able to create and get events for a specific user.
My original goal was to allow every user to get, create, update and delete Events on their own calendar.
Here's what I have been doing in the code.
This is calendarSetting.php file.
<?php
require __DIR__ . '/vendor/autoload.php';
function getClient()
{
$client = new Google_Client();
$client->setApplicationName('Google Calendar API PHP Quickstart');
$client->setScopes(Google_Service_Calendar::CALENDAR);
$client->setAuthConfig('client_secret.json');
$client->setAccessType('offline');
$client->setPrompt('select_account consent');
$tokenPath = 'token.json';
if (file_exists($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;
}
?>
This is createCalendar.php file
<?php
require __DIR__ . '/vendor/autoload.php';
include('calendarSetting.php');
session_start();
$appointment_id = $_SESSION['appointment_id'];
$patient_fname = $_SESSION['patient_fname'];
$patient_lname = $_SESSION['patient_lname'];
$patient_phone = $_SESSION['patient_phone'];
$schedule = $_SESSION['appointment_date'];
$start_date = $_SESSION['start'];
$end_date = $_SESSION['end'];
$client = getClient();
$service = new Google_Service_Calendar($client);
$event = new Google_Service_Calendar_Event(array(
'summary' => $patient_fname . ' ' . $patient_lname,
'description' => $patient_fname . ' ' . ' ' . $patient_lname . ' ' . $patient_phone ,
'start' => array(
'dateTime' => $start_date.':00+05:00',
'timeZone' => 'America/Los_Angeles',
),
'end' => array(
'dateTime' => $end_date.':00+05:00',
'timeZone' => 'America/Los_Angeles',
),
'recurrence' => array(
'RRULE:FREQ=DAILY;COUNT=1'
),
'attendees' => array(
array('email' => 'abc1211#gmail.com')
)
));
$calendarId = 'user876#gmail.com';
$event = $service->events->insert($calendarId, $event);
printf('Event created');
header('location: Doctor');
?>
This is perfectly working for the user where $calendarId = 'user876#gmail.com';. but if I change the user it gives me an error.
Fatal error: Uncaught Google\Service\Exception: { "error": { "errors":
[ { "domain": "global", "reason": "notFound", "message": "Not Found" }
], "code": 404, "message": "Not Found" } } in
F:\xampp\htdocs\bupa1\vendor\google\apiclient\src\Http\REST.php:128
Stack trace: #0
F:\xampp\htdocs\bupa1\vendor\google\apiclient\src\Http\REST.php(103):
Google\Http\REST::decodeHttpResponse(Object(GuzzleHttp\Psr7\Response),
Object(GuzzleHttp\Psr7\Request), 'Google_Service_...') #1 [internal
function]: Google\Http\REST::doExecute(Object(GuzzleHttp\Client),
Object(GuzzleHttp\Psr7\Request), 'Google_Service_...') #2
F:\xampp\htdocs\bupa1\vendor\google\apiclient\src\Task\Runner.php(182):
call_user_func_array(Array, Array) #3
F:\xampp\htdocs\bupa1\vendor\google\apiclient\src\Http\REST.php(66):
Google\Task\Runner->run() #4
F:\xampp\htdocs\bupa1\vendor\google\apiclient\src\Client.php(898):
Google\Http\REST::execute(Object(GuzzleHttp\Client),
Object(GuzzleHttp\Psr7\Request), 'Google_Service_...', Array, NULL) #5
F:\x in
F:\xampp\htdocs\bupa1\vendor\google\apiclient\src\Http\REST.php on
line 128
I have been trying to figure out why is this happening. so far what I found is that each time when i send a request to google to create the event my access token in the calendarSetting.php file isn't refreshing.
Now I got stuck on how can I get the refresh token so that a new user could also create events.
If anybody could help to figure this out I'll be very grateful.
Thank you

Answer 1

What you have right now will end up being a single user system. If the file exists then no one else will need to login. If you start deleting that file then what about if user one is still using the system they will then be reading data using user twos token from the file.
If this is a web app you should be using session vars.
oauth2callback.php
require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/Oauth2Authentication.php';
// Start a session to persist credentials.
session_start();
// Handle authorization flow from the server.
if (! isset($_GET['code'])) {
$client = buildClient();
$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
} else {
$client = buildClient();
$client->authenticate($_GET['code']); // Exchange the authencation code for a refresh token and access token.
// Add access token and refresh token to seession.
$_SESSION['access_token'] = $client->getAccessToken();
$_SESSION['refresh_token'] = $client->getRefreshToken();
//Redirect back to main script
$redirect_uri = str_replace("oauth2callback.php",$_SESSION['mainScript'],$client->getRedirectUri());
header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}
Oauth2Authentication.php
You should check the full link for all the code in this file. Notice how it stores the users tokens in the session vars so each user has its own tokens stored in its browser.
function getOauth2Client() {
try {
$client = buildClient();
// Set the refresh token on the client.
if (isset($_SESSION['refresh_token']) && $_SESSION['refresh_token']) {
$client->refreshToken($_SESSION['refresh_token']);
}
// If the user has already authorized this app then get an access token
// else redirect to ask the user to authorize access to Google Analytics.
if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
// Set the access token on the client.
$client->setAccessToken($_SESSION['access_token']);
// Refresh the access token if it's expired.
if ($client->isAccessTokenExpired()) {
$client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
$client->setAccessToken($client->getAccessToken());
$_SESSION['access_token'] = $client->getAccessToken();
}
return $client;
} else {
// We do not have access request access.
header('Location: ' . filter_var( $client->getRedirectUri(), FILTER_SANITIZE_URL));
}
} catch (Exception $e) {
print "An error occurred: " . $e->getMessage();
}
}