GuzzleHttp firebase messaging INVALID_ARGUMENT The message is not set - php

Question

I'm trying to implement a function to send a a notification using FirebaseCloudMessaging, I got the Auth part, But seems there is an issue with the GuzzleHttp\Client and how it passes the data part
This is my code
public function send(){
putenv('GOOGLE_APPLICATION_CREDENTIALS=<path-to-json-file>.json');
$scopes = ['https://www.googleapis.com/auth/firebase.messaging'];
$middleware = ApplicationDefaultCredentials::getMiddleware($scopes);
$stack = HandlerStack::create();
$stack->push($middleware);
// create the HTTP client
$client = new Client([
'handler' => $stack,
'base_uri' => 'https://fcm.googleapis.com',
'auth' => 'google_auth'
]);
$data = json_encode(
[
"message" => [
"topic" => "availableProviders",
"notification" => [
"title" => "New Order",
"body" => "New Order to accept",
],
"data" => [
"service_id" => '1'
],
],
"validateOnly" => false,
],
);
$response = $client->post('/v1/projects/<Project-id>/messages:send', [
[
'json' => $data,
'headers' => [
'accept' => 'application/json',
'Content-Type' => 'application/json',
],
]
]);
dd($response);
}
I keep getting that response 400, INVALID_ARGUMENT "The message is not set."
Client error: POST https://fcm.googleapis.com/v1/projects//messages:sendresulted in a400 Bad Request response: { "error": { "code": 400, "message": "The message is not set.", "status": "INVALID_ARGUMENT", "details (truncated...)
Although my data structure is being passed as documented, what I'm missing here?
Note: I use Laravel, I hided the , etc.

Answer 1

Try to use the Laravel wrapper
use Google\Auth\ApplicationDefaultCredentials;
use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;
use Illuminate\Support\Facades\Http;
public function send(){
putenv('GOOGLE_APPLICATION_CREDENTIALS=D:\Projects\waterko_final\waterco-356810-firebase-adminsdk-brisz-11133a2abb.json');
$scopes = ['https://www.googleapis.com/auth/firebase.messaging'];
$data = [
"message" => [
"topic" => "availableProviders",
"notification" => [
"title" => "New Order",
"body" => "New Order to accept",
],
"data" => [
"service_id" => '1'
],
],
"validateOnly" => false,
];
$headers = [
'Accept' => 'application/json',
'Content-Type' => 'application/json',
];
$middleware = ApplicationDefaultCredentials::getMiddleware($scopes);
$stack = HandlerStack::create();
$stack->push($middleware);
$client = new Client([
'handler' => $stack,
'base_uri' => 'https://fcm.googleapis.com',
'auth' => 'google_auth'
]);
return Http::withHeaders($headers)->bodyFormat("json")->setClient($client)
->post('https://fcm.googleapis.com/v1/projects/waterco-356810/messages:send', $data);
}

Answer 2

I ran into the exact same issue, here's what worked for me:
$data should not be json encoded, but passed as an array.
And instead of the json key, it's safer to use the constant : GuzzleHttp\RequestOptions::JSON
$data = [
"message" => [
"topic" => "availableProviders",
"notification" => [
"title" => "New Order",
"body" => "New Order to accept",
],
"data" => [
"service_id" => '1'
],
],
"validateOnly" => false,
];
$response = $client->post('/v1/projects/<Project-id>/messages:send', [
[
GuzzleHttp\RequestOptions::JSON => $data,
'headers' => [
'accept' => 'application/json',
'Content-Type' => 'application/json',
],
]
]);