(C++) ABN AMRO Create Signed JSON Web Token

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's.

Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://developer.abnamro.com/get-started#headingFive

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#include <CkRsa.h>
#include <CkPrivateKey.h>
#include <CkPublicKey.h>
#include <CkJwt.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Create public/private key pair (RSA)
    CkRsa rsa;

    // Generate a 2048-bit key.
    CkPrivateKey privkey;
    success = rsa.GenKey(2048,privkey);
    if (success == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    // Export the key to PEM files.
    // Write one PEM file for the private key, and one for the public key.
    success = privkey.SavePemFile("qa_data/pem/abnAmroPrivateKey.pem");

    CkPublicKey pubkey;
    privkey.ToPublicKey(pubkey);
    success = pubkey.SavePemFile(true,"qa_data/pem/abnAmroPublicKey.pem");
    // Note: Please share your public key along with your app name and developer email id at api.support@nl.abnamro.com. 
    // Token generation will not work unless public key is associated with your app.

    // Create the JWT.
    CkJwt jwt;

    // Create the header:
    // {
    //     "typ": "JWT",
    //     "alg": "RS256"
    // }
    CkJsonObject jsonHeader;
    jsonHeader.UpdateString("typ","JWT");
    jsonHeader.UpdateString("alg","RS256");

    // Create the payload:
    // {
    //     "nbf": 1499947668,
    //     "exp": 1499948668,
    //     "iss": "me",
    //     "sub": "anApiKey",
    //     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
    // }
    CkJsonObject jsonPayload;

    int curDateTime = jwt.GenNumericDate(0);

    // Set the "not process before" timestamp to now.
    success = jsonPayload.AddIntAt(-1,"nbf",curDateTime);

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    success = jsonPayload.AddIntAt(-1,"exp",curDateTime + 3600);

    jsonPayload.UpdateString("iss","me");
    jsonPayload.UpdateString("sub","anApiKey");
    jsonPayload.UpdateString("aud","https://auth-sandbox.abnamro.com/oauth/token");

    // Produce the smallest possible JWT:
    jwt.put_AutoCompact(true);

    const char *jwtStr = jwt.createJwtPk(jsonHeader.emit(),jsonPayload.emit(),privkey);
    if (jwt.get_LastMethodSuccess() == false) {
        std::cout << jwt.lastErrorText() << "\r\n";
        return;
    }

    // Here is the JWT:
    std::cout << jwtStr << "\r\n";
    }