(Go) 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.

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

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

    // Create public/private key pair (RSA)
    rsa := chilkat.NewRsa()

    // Generate a 2048-bit key.
    success := rsa.GenerateKey(2048)
    if success != true {
        fmt.Println(rsa.LastErrorText())
        rsa.DisposeRsa()
        return
    }

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

    pubkey := rsa.ExportPublicKeyObj()
    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.
    jwt := chilkat.NewJwt()

    // Create the header:
    // {
    //     "typ": "JWT",
    //     "alg": "RS256"
    // }
    jsonHeader := chilkat.NewJsonObject()
    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"
    // }
    jsonPayload := chilkat.NewJsonObject()

    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.SetAutoCompact(true)

    jwtStr := jwt.CreateJwtPk(*jsonHeader.Emit(),*jsonPayload.Emit(),privkey)
    if jwt.LastMethodSuccess() != true {
        fmt.Println(jwt.LastErrorText())
        rsa.DisposeRsa()
        jwt.DisposeJwt()
        jsonHeader.DisposeJsonObject()
        jsonPayload.DisposeJsonObject()
        return
    }

    privkey.DisposePrivateKey()
    pubkey.DisposePublicKey()

    // Here is the JWT:
    fmt.Println(*jwtStr)

    rsa.DisposeRsa()
    jwt.DisposeJwt()
    jsonHeader.DisposeJsonObject()
    jsonPayload.DisposeJsonObject()