Sample GNAP client in PHP

This is a minimal GNAP client in PHP to demonstrate interacting with a GNAP Authorization Server.

This is tested against the Java GNAP Server hosted at https://gnap-as.herokuapp.com/

Setup

Install PHP dependencies:

sudo apt install php8.1 php8.1-mbstring php8.1-curl redis-server

Install the required libraries:

composer require phpseclib/phpseclib:~3.0
composer require web-token/jwt-key-mgmt web-token/jwt-signature
composer require predis/predis

or just

composer install

How to Run

Generate a private key:

php gnap-cli.php keygen

This will generate an RSA private key and save it in a file private.pem, and the corresponding public key in public.pem and the JWK public key in public-key.json.

Start a new request:

php gnap-cli.php start

If everything works, you should see a URL printed in the console. Open that URL in your browser to authorize the client.

Poll the transaction endpoint until the client gets a token:

php gnap-cli.php poll

After you authorize the client, you should get an access token in the response!