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<?php
function base64UrlEncode($data) {
    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}

function createJwt($header, $payload, $privateKey) {
    $headerEncoded = base64UrlEncode(json_encode($header));
    $payloadEncoded = base64UrlEncode(json_encode($payload));

$signature = "";
    openssl_sign(
        "$headerEncoded.$payloadEncoded",
        $signature,
        $privateKey,
        OPENSSL_ALGO_SHA256
    );

$signatureEncoded = base64UrlEncode($signature);

return "$headerEncoded.$payloadEncoded.$signatureEncoded";
}

function sendNotification($deviceToken, $title, $body, $data = []) {
    // Path to your service account JSON file
    $serviceAccountFile = 'finance-management-af955-firebase-adminsdk-uq964-cdd33aee9e.json';

// Project ID from Firebase Console
    $projectId = 'finance-management-af955'; // Replace with your project ID

// HTTP v1 API endpoint
    $url = "https://fcm.googleapis.com/v1/projects/{$projectId}/messages:send";

// Read the service account file
    $serviceAccount = json_decode(file_get_contents($serviceAccountFile), true);

// Create a JWT token for OAuth 2.0 authentication
    $privateKey = $serviceAccount['private_key'];
    $clientEmail = $serviceAccount['client_email'];

$now = time();
    $jwtHeader = [
        'alg' => 'RS256',
        'typ' => 'JWT',
    ];

$jwtPayload = [
        'iss' => $clientEmail,
        'sub' => $clientEmail,
        'aud' => 'https://oauth2.googleapis.com/token',
        'iat' => $now,
        'exp' => $now + 3600, // Token valid for 1 hour
        'scope' => 'https://www.googleapis.com/auth/firebase.messaging',
    ];

$jwt = createJwt($jwtHeader, $jwtPayload, $privateKey);

// Obtain an OAuth 2.0 access token
    $tokenUrl = 'https://oauth2.googleapis.com/token';
    $tokenResponse = file_get_contents($tokenUrl, false, stream_context_create([
        'http' => [
            'method' => 'POST',
            'header' => 'Content-Type: application/x-www-form-urlencoded',
            'content' => http_build_query([
                'grant_type' => 'urn:ietf:params:oauth:grant-type:jwt-bearer',
                'assertion' => $jwt,
            ]),
        ],
    ]));

$accessToken = json_decode($tokenResponse, true)['access_token'];

// Notification payload
    $payload = [
        'message' => [
            'token' => $deviceToken,
            'notification' => [
                'title' => $title,
                'body' => $body,
            ],
            'data' => $data, // Optional additional data
        ],
    ];

// HTTP headers
    $headers = [
        "Authorization: Bearer {$accessToken}",
        'Content-Type: application/json',
    ];

// Send the notification
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));

$result = curl_exec($ch);

if ($result === FALSE) {
        die('FCM Send Error: ' . curl_error($ch));
    }

curl_close($ch);

return $result;
}

// Usage example
$deviceToken = 'cBI-D5tmQRqyJb6N7E7FtG:APA91bG7oY2WTpBjqJmcGPSD_CvPXWzJKvobNZ-iFEwxQAkXwFoIZtcBjgygMljF6TeBMoeiRKhaDA2riv6Dn9uk1mzwwGOyoUpss1Bii-RlGxaXK7WLMjI'; // Replace with a valid device token
$title = 'Hello with HTTP v1!';
$body = 'This notification is sent via the HTTP v1 API.';
$data = ['key' => 'value'];

$response = sendNotification($deviceToken, $title, $body, $data);
echo $response;
?>

Free Space : 11477643264 Byte