How do I authenticate with JWT using gRPC for PHP?

Question

I've generated my client code from proto files. Now I'm trying to connect but get the 'jwt' is not located at the context error from server. Here's what I do:

$myServiceClient = new MyServiceClient(
    "$host:$port",
    [
        'credentials' => ChannelCredentials::createInsecure(),
        'update_metadata' => function ($metaData) use ($token) {
//            $metaData['authorization'] = ['jwt' . $token]; // doesn't work
//            $metaData['authorization']['jwt'] = $token; // doesn't work
//            $metaData['jwt'] = $token; // doesn't work
            $metaData['authorization'] = ['Bearer ' . $token]; // doesn't work

            return $metaData;
        },
    ]
);
$unaryCall = $myServiceClient->MyMethod(new MyMethodRequest());
$wait = $unaryCall->wait();

Answer 1

Try this

$myServiceClient = new MyServiceClient(
    "$host:$port",
    [
        'credentials' => ChannelCredentials::createInsecure(),
        'update_metadata' => function ($metaData) use ($token) {
            $metaData['Authorization'] = 'Bearer ' . $token; 
            return $metaData;
        },
    ]
);

Best HTTP Authorization header type for JWT

Or like this:

https://jwt.io/introduction

Authorization: Bearer <token>

Answer 2

The following works for me:

$myServiceClient = new MyServiceClient(
    "$host:$port",
    [
        'credentials' => ChannelCredentials::createInsecure(),
        'update_metadata' => function ($metaData) use ($token) {
            $metaData['jwt'] = [$token];

            return $metaData;
        },
    ]
);