(Lianja) 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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// 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

loPrivKey = createobject("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.
llSuccess = loPrivKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
if (llSuccess <> .T.) then
    ? loPrivKey.LastErrorText
    release loPrivKey
    return
endif

loJwt = createobject("CkJwt")

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

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

// Set the timestamp of when the JWT was created to now.
lnCurDateTime = loJwt.GenNumericDate(0)
llSuccess = loClaims.AddIntAt(-1,"iat",lnCurDateTime)

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

// Produce the smallest possible JWT:
loJwt.AutoCompact = .T.

// Create the JWT token.  This is where the RSA signature is created.
lcJwtToken = loJwt.CreateJwtPk(loJose.Emit(),loClaims.Emit(),loPrivKey)

// ---------------------------------------------------------------------
// 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

loHttp = createobject("CkHttp")

loReq = createobject("CkHttpRequest")

// Add the request params.
loReq.AddParam("grant_type","urn:ietf:params:oauth:grant-type:jwt-bearer")
loReq.AddParam("assertion",lcJwtToken)
loReq.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.

loResp = loHttp.PostUrlEncoded("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token",loReq)
if (loHttp.LastMethodSuccess <> .T.) then
    ? loHttp.LastErrorText
    release loPrivKey
    release loJwt
    release loJose
    release loClaims
    release loHttp
    release loReq
    return
endif

? "Response status code = " + str(loResp.StatusCode)
? "Response body:"
? loResp.BodyStr

release loResp


release loPrivKey
release loJwt
release loJose
release loClaims
release loHttp
release loReq