(Ruby) 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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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::CkRsa.new()

# Generate a 2048-bit key.
success = rsa.GenerateKey(2048)
if (success != true)
    print rsa.lastErrorText() + "\n";
    exit
end

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

# pubkey is a CkPublicKey
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::CkJwt.new()

# Create the header:
# {
#     "typ": "JWT",
#     "alg": "RS256"
# }
jsonHeader = Chilkat::CkJsonObject.new()
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::CkJsonObject.new()

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)

jwtStr = jwt.createJwtPk(jsonHeader.emit(),jsonPayload.emit(),privkey)
if (jwt.get_LastMethodSuccess() != true)
    print jwt.lastErrorText() + "\n";
    exit
end

# Here is the JWT:
print jwtStr + "\n";