(C# UWP/WinRT) Duo Auth API - Preauth

See more Duo Auth MFA Examples

The /preauth endpoint determines whether a user is authorized to log in, and (if so) returns the user's available authentication factors.

Note: This example requires Chilkat v9.5.0.89 or greater.

For more information, see https://duo.com/docs/authapi#/preauth

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

string integrationKey = "DIMS3V5QDVG9J9ABRXC4";
string secretKey = "HWVQ46nubLBxhnRlKddTltWIi3hL0fIQF2qTvLab";

Chilkat.Http http = new Chilkat.Http();

http.Accept = "application/json";

// Use your own hostname here:
string url = "https://api-a03782e1.duosecurity.com/auth/v2/preauth";

// This example requires Chilkat v9.5.0.89 or greater because Chilkat will automatically
// generate and send the HMAC signature for the requires based on the integration key and secret key.
http.Login = integrationKey;
http.Password = secretKey;

Chilkat.HttpRequest req = new Chilkat.HttpRequest();
req.AddParam("username","matt");

Chilkat.HttpResponse resp = await http.PostUrlEncodedAsync(url,req);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("status code = " + Convert.ToString(resp.StatusCode));

Chilkat.JsonObject json = new Chilkat.JsonObject();
bool success = json.Load(resp.BodyStr);
json.EmitCompact = false;
Debug.WriteLine(json.Emit());

// Sample successful output:

// status code = 200

// {
//   "response": {
//     "devices": [
//       {
//         "capabilities": [
//           "auto",
//           "push",
//           "sms",
//           "mobile_otp"
//         ],
//         "device": "DP6GYVTQ5NK82BMR851F",
//         "display_name": "iOS (XXX-XXX-1871)",
//         "name": "",
//         "number": "XXX-XXX-1871",
//         "type": "phone"
//       }
//     ],
//     "result": "auth",
//     "status_msg": "Account is active"
//   },
//   "stat": "OK"
// }

// Sample code to parse the above JSON response..

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

string device;
string display_name;
string name;
string number;
string v_type;
int j;
int count_j;
string strVal;

string responseResult = json.StringOf("response.result");
string responseStatus_msg = json.StringOf("response.status_msg");
string stat = json.StringOf("stat");
int i = 0;
int count_i = json.SizeOfArray("response.devices");
while (i < count_i) {
    json.I = i;
    device = json.StringOf("response.devices[i].device");
    display_name = json.StringOf("response.devices[i].display_name");
    name = json.StringOf("response.devices[i].name");
    number = json.StringOf("response.devices[i].number");
    v_type = json.StringOf("response.devices[i].type");
    j = 0;
    count_j = json.SizeOfArray("response.devices[i].capabilities");
    while (j < count_j) {
        json.J = j;
        strVal = json.StringOf("response.devices[i].capabilities[j]");
        j = j + 1;
    }

    i = i + 1;
}