(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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 = New-Object Chilkat.PrivateKey

# 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 -ne $true) {
    $($privKey.LastErrorText)
    exit
}

$jwt = New-Object Chilkat.Jwt

# Build the JOSE header
$jose = New-Object Chilkat.JsonObject
# 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 = New-Object Chilkat.JsonObject
$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.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 = New-Object Chilkat.Http

$req = New-Object Chilkat.HttpRequest

# 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 = $http.PostUrlEncoded("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token",$req)
if ($http.LastMethodSuccess -ne $true) {
    $($http.LastErrorText)
    exit
}

$("Response status code = " + $resp.StatusCode)
$("Response body:")
$($resp.BodyStr)