(PowerBuilder) 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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_PrivKey
integer li_Success
oleobject loo_Jwt
oleobject loo_Jose
oleobject loo_Claims
integer li_CurDateTime
string ls_JwtToken
oleobject loo_Http
oleobject loo_Req
oleobject loo_Resp

// 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

loo_PrivKey = create oleobject
// Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
li_rc = loo_PrivKey.ConnectToNewObject("Chilkat.PrivateKey")
if li_rc < 0 then
    destroy loo_PrivKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// 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.
li_Success = loo_PrivKey.LoadEncryptedPemFile("qa_data/pem/rsa_passwd.pem","passwd")
if li_Success <> 1 then
    Write-Debug loo_PrivKey.LastErrorText
    destroy loo_PrivKey
    return
end if

loo_Jwt = create oleobject
// Use "Chilkat_9_5_0.Jwt" for versions of Chilkat < 10.0.0
li_rc = loo_Jwt.ConnectToNewObject("Chilkat.Jwt")

// Build the JOSE header
loo_Jose = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_Jose.ConnectToNewObject("Chilkat.JsonObject")

// Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
li_Success = loo_Jose.AppendString("alg","RS256")
li_Success = loo_Jose.AppendString("typ","JWT")
li_Success = loo_Jose.AppendString("kid","test-device")

// Now build the JWT claims (also known as the payload)
loo_Claims = create oleobject
// Use "Chilkat_9_5_0.JsonObject" for versions of Chilkat < 10.0.0
li_rc = loo_Claims.ConnectToNewObject("Chilkat.JsonObject")

li_Success = loo_Claims.AppendString("iss","9646844092")
li_Success = loo_Claims.AppendString("sub","test-device")
li_Success = loo_Claims.AppendString("aud","https://proda.humanservices.gov.au")

// Set the timestamp of when the JWT was created to now.
li_CurDateTime = loo_Jwt.GenNumericDate(0)
li_Success = loo_Claims.AddIntAt(-1,"iat",li_CurDateTime)

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

// Produce the smallest possible JWT:
loo_Jwt.AutoCompact = 1

// Create the JWT token.  This is where the RSA signature is created.
ls_JwtToken = loo_Jwt.CreateJwtPk(loo_Jose.Emit(),loo_Claims.Emit(),loo_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

loo_Http = create oleobject
// Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")

loo_Req = create oleobject
// Use "Chilkat_9_5_0.HttpRequest" for versions of Chilkat < 10.0.0
li_rc = loo_Req.ConnectToNewObject("Chilkat.HttpRequest")

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

loo_Resp = loo_Http.PostUrlEncoded("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token",loo_Req)
if loo_Http.LastMethodSuccess <> 1 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_PrivKey
    destroy loo_Jwt
    destroy loo_Jose
    destroy loo_Claims
    destroy loo_Http
    destroy loo_Req
    return
end if

Write-Debug "Response status code = " + string(loo_Resp.StatusCode)
Write-Debug "Response body:"
Write-Debug loo_Resp.BodyStr

destroy loo_Resp


destroy loo_PrivKey
destroy loo_Jwt
destroy loo_Jose
destroy loo_Claims
destroy loo_Http
destroy loo_Req