(Swift) 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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func chilkatTest() {
    var success: Bool = 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)
    let rsa = CkoRsa()!

    // Generate a 2048-bit key.
    let privkey = CkoPrivateKey()!
    success = rsa.genKey(2048, privKey: privkey)
    if success == false {
        print("\(rsa.lastErrorText!)")
        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")

    let pubkey = CkoPublicKey()!
    privkey.to(pubkey)
    success = pubkey.savePemFile(true, path: "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.
    let jwt = CkoJwt()!

    // Create the header:
    // {
    //     "typ": "JWT",
    //     "alg": "RS256"
    // }
    let jsonHeader = CkoJsonObject()!
    jsonHeader.update("typ", value: "JWT")
    jsonHeader.update("alg", value: "RS256")

    // Create the payload:
    // {
    //     "nbf": 1499947668,
    //     "exp": 1499948668,
    //     "iss": "me",
    //     "sub": "anApiKey",
    //     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
    // }
    let jsonPayload = CkoJsonObject()!

    var curDateTime: Int = jwt.genNumericDate(0).intValue

    // Set the "not process before" timestamp to now.
    success = jsonPayload.addInt(at: -1, name: "nbf", value: curDateTime)

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

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

    // Produce the smallest possible JWT:
    jwt.autoCompact = true

    var jwtStr: String? = jwt.createJwtPk(jsonHeader.emit(), payload: jsonPayload.emit(), key: privkey)
    if jwt.lastMethodSuccess == false {
        print("\(jwt.lastErrorText!)")
        return
    }

    // Here is the JWT:
    print("\(jwtStr!)")

}