const jose = require('node-jose');

var preEncryptionRequest = {
    data: {
        "paymentInformation": {
            "card": {
                "expirationYear": "22",
                "number": "[place PAN Here]",
                "expirationMonth": "05",
                "securityCode": "122"
            }
        }
    },
    context: 'eyJraWQiOiIzZyIsImFsZyI6IlJTMjU2In0.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.Onzufhz0HetjfAsEz84XG5Vkrqm60napZSWsIZZEeAkrDjE7KSWsZ-zZMn0mPAo-ZC4C0WbKYfM9cYct7kTcMykT9xphxcxIoMbfE2MiJfBCMbGvmfg13aOA9x8TzuZYlvr-BVCdRf9GI2Cq-aAvfM37nl_B5C66yywDL00sprPE6TkisNDWKYtSN03XFoT0Rl2I32-TJxnN6RMmUPjJqh8e81X2cIJqsLcv43bZmTSYZHJQK8dQmV2YTA8u8hupTAohWWVOZ4fx3MmSmevpTVep4QZp-A3HwyThBOsXVmjy4j1ezqbecRMAyS2CU_9NSPB6tLtH_2oeOMdLi-iK8Q',
    index: 0
};

var payload = JSON.stringify(preEncryptionRequest);



function calculateJWE(payload) {
    //    
    console.log('\nSample: Construct JWE for Cybersource Token Request');


    console.log('\n*************** Parsing CC & Extracting JWK ********************* ');
    // Parse the Capture Context from the context element of the input payload, base 64 decode & extract the JWK
    var ccBody = JSON.parse(payload).context.split('.')[1];
    var atob = require('atob');
    var decodedValue = JSON.parse(atob(ccBody));
    var jwk = decodedValue.flx.jwk;
    console.log("JWK =", jwk, "\n");



    // Creating keystore input
    const webkey = {
        "keys": [
            JSON.stringify(jwk)
        ]        
    };

    //Generate key store from public JWK
    jose.JWK.asKeyStore(webkey).
        then((result) => {

            let keyStore = result;

            //get the key to encrypt
            const encryptionKey = keyStore.get(webkey.keys[0].kid);
            //passing input as buffer
            const input = jose.util.asBuffer(payload);
            //encryption paramiters
            let contentAlg = "A256GCM";
            let options =
            {
                contentAlg: contentAlg,
                compact: true,
            };

            //Constructing JWE
            jose.JWE.createEncrypt(options, encryptionKey).
                update(input).
                final().
                then((jweInGeneralSerialization) => {
                    console.log("Encryption result", JSON.stringify(jweInGeneralSerialization));

                    console.log('\n*************** JWE  ********************* ');
                    console.log(jweInGeneralSerialization);

                    return jweInGeneralSerialization;

                });

        });


}

if (require.main === module) {
    calculateJWE(payload);
}
module.exports.calculateJWE = calculateJWE;