(CkPython) PRODA Get OAuth2 Access Token using JWT

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Demonstrates how to get an OAuth2 access token for the PRODA Australian Government Online Services using a JWT.

For more information, see https://www.servicesaustralia.gov.au/organisations/business/services/proda-provider-digital-access

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import sys
import chilkat

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

# First create a JWT to be sent in the POST to https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token

privKey = chilkat.CkPrivateKey()

# Load an RSA private key from a PEM file.
# Chilkat provides alternative methods to load from other formats, or to load from a string or binary data.
success = privKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
if (success != True):
    print(privKey.lastErrorText())
    sys.exit()

jwt = chilkat.CkJwt()

# Build the JOSE header
jose = chilkat.CkJsonObject()
# Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
success = jose.AppendString("alg","RS256")
success = jose.AppendString("typ","JWT")
success = jose.AppendString("kid","test-device")

# Now build the JWT claims (also known as the payload)
claims = chilkat.CkJsonObject()
success = claims.AppendString("iss","9646844092")
success = claims.AppendString("sub","test-device")
success = claims.AppendString("aud","https://proda.humanservices.gov.au")

# Set the timestamp of when the JWT was created to now.
curDateTime = jwt.GenNumericDate(0)
success = claims.AddIntAt(-1,"iat",curDateTime)

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

# Produce the smallest possible JWT:
jwt.put_AutoCompact(True)

# Create the JWT token.  This is where the RSA signature is created.
jwtToken = jwt.createJwtPk(jose.emit(),claims.emit(),privKey)

# ---------------------------------------------------------------------
# Build and send the POST, which should look something like this:

# POST https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token HTTP/1.1
# Content-Type: application/x-www-form-urlencoded
# Content-Length: 666
# Host: vnd.proda.humanservices.gov.au
# 
# grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer&assertion=<jwt>&client_id=VendorClient03

http = chilkat.CkHttp()

req = chilkat.CkHttpRequest()

# Add the request params.
req.AddParam("grant_type","urn:ietf:params:oauth:grant-type:jwt-bearer")
req.AddParam("assertion",jwtToken)
req.AddParam("client_id","VendorClient03")

# Send the POST
# Chilkat automatically adds the Content-Type (which is application/x-www-form-urlencoded for the PostUrlEncoded method)
# Chilkat also automatically adds the Host and Content-Length headers.

# resp is a CkHttpResponse
resp = http.PostUrlEncoded("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token",req)
if (http.get_LastMethodSuccess() != True):
    print(http.lastErrorText())
    sys.exit()

print("Response status code = " + str(resp.get_StatusCode()))
print("Response body:")
print(resp.bodyStr())