(Swift 3,4,5...) 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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func chilkatTest() {
    // 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

    let privKey = CkoPrivateKey()!

    // 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.
    var success: Bool = privKey.loadEncryptedPemFile("qa_data/pem/rsa_passwd.pem", password: "passwd")
    if success != true {
        print("\(privKey.lastErrorText!)")
        return
    }

    let jwt = CkoJwt()!

    // Build the JOSE header
    let jose = CkoJsonObject()!
    // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    success = jose.append("alg", value: "RS256")
    success = jose.append("typ", value: "JWT")
    success = jose.append("kid", value: "test-device")

    // Now build the JWT claims (also known as the payload)
    let claims = CkoJsonObject()!
    success = claims.append("iss", value: "9646844092")
    success = claims.append("sub", value: "test-device")
    success = claims.append("aud", value: "https://proda.humanservices.gov.au")

    // Set the timestamp of when the JWT was created to now.
    var curDateTime: Int = jwt.genNumericDate(0).intValue
    success = claims.addInt(at: -1, name: "iat", value: curDateTime)

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    success = claims.addInt(at: -1, name: "exp", value: curDateTime + 3600)

    // Produce the smallest possible JWT:
    jwt.autoCompact = true

    // Create the JWT token.  This is where the RSA signature is created.
    var jwtToken: String? = jwt.createJwtPk(jose.emit(), payload: claims.emit(), key: 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

    let http = CkoHttp()!

    let req = CkoHttpRequest()!

    // Add the request params.
    req.addParam("grant_type", value: "urn:ietf:params:oauth:grant-type:jwt-bearer")
    req.addParam("assertion", value: jwtToken)
    req.addParam("client_id", value: "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.
    var resp: CkoHttpResponse?
    resp = http.postUrlEncoded("https://vnd.proda.humanservices.gov.au/mga/sps/oauth/oauth20/token", req: req)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    print("Response status code = \(resp!.statusCode.intValue)")
    print("Response body:")
    print("\(resp!.bodyStr!)")

    resp = nil

}