(Perl) 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 Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use 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->new();

# 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 != 1) {
    print $privKey->lastErrorText() . "\r\n";
    exit;
}

$jwt = chilkat::CkJwt->new();

# Build the JOSE header
$jose = chilkat::CkJsonObject->new();
# 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->new();
$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(1);

# 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->new();

$req = chilkat::CkHttpRequest->new();

# 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 HttpResponse
$resp = $http->PostUrlEncoded("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token",$req);
if ($http->get_LastMethodSuccess() != 1) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

print "Response status code = " . $resp->get_StatusCode() . "\r\n";
print "Response body:" . "\r\n";
print $resp->bodyStr() . "\r\n";