(Delphi ActiveX) 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 for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
integrationKey: WideString;
secretKey: WideString;
http: TChilkatHttp;
url: WideString;
req: TChilkatHttpRequest;
resp: IChilkatHttpResponse;
json: TChilkatJsonObject;
success: Integer;
device: WideString;
display_name: WideString;
name: WideString;
number: WideString;
v_type: WideString;
j: Integer;
count_j: Integer;
strVal: WideString;
responseResult: WideString;
responseStatus_msg: WideString;
stat: WideString;
i: Integer;
count_i: Integer;

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

integrationKey := 'DIMS3V5QDVG9J9ABRXC4';
secretKey := 'HWVQ46nubLBxhnRlKddTltWIi3hL0fIQF2qTvLab';

http := TChilkatHttp.Create(Self);

http.Accept := 'application/json';

// Use your own hostname here:
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;

req := TChilkatHttpRequest.Create(Self);
req.AddParam('username','matt');

resp := http.PostUrlEncoded(url,req.ControlInterface);
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('status code = ' + IntToStr(resp.StatusCode));

json := TChilkatJsonObject.Create(Self);
success := json.Load(resp.BodyStr);
json.EmitCompact := 0;
Memo1.Lines.Add(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

responseResult := json.StringOf('response.result');
responseStatus_msg := json.StringOf('response.status_msg');
stat := json.StringOf('stat');
i := 0;
count_i := json.SizeOfArray('response.devices');
while i < count_i do
  begin
    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 do
      begin
        json.J := j;
        strVal := json.StringOf('response.devices[i].capabilities[j]');
        j := j + 1;
      end;

    i := i + 1;
  end;
end;