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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, HttpRequest, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
integrationKey: PWideChar;
secretKey: PWideChar;
http: HCkHttp;
url: PWideChar;
req: HCkHttpRequest;
resp: HCkHttpResponse;
json: HCkJsonObject;
success: Boolean;
device: PWideChar;
display_name: PWideChar;
name: PWideChar;
number: PWideChar;
v_type: PWideChar;
j: Integer;
count_j: Integer;
strVal: PWideChar;
responseResult: PWideChar;
responseStatus_msg: PWideChar;
stat: PWideChar;
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 := CkHttp_Create();

CkHttp_putAccept(http,'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.
CkHttp_putLogin(http,integrationKey);
CkHttp_putPassword(http,secretKey);

req := CkHttpRequest_Create();
CkHttpRequest_AddParam(req,'username','matt');

resp := CkHttp_PostUrlEncoded(http,url,req);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

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

json := CkJsonObject_Create();
success := CkJsonObject_Load(json,CkHttpResponse__bodyStr(resp));
CkJsonObject_putEmitCompact(json,False);
Memo1.Lines.Add(CkJsonObject__emit(json));

CkHttpResponse_Dispose(resp);

// 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 := CkJsonObject__stringOf(json,'response.result');
responseStatus_msg := CkJsonObject__stringOf(json,'response.status_msg');
stat := CkJsonObject__stringOf(json,'stat');
i := 0;
count_i := CkJsonObject_SizeOfArray(json,'response.devices');
while i < count_i do
  begin
    CkJsonObject_putI(json,i);
    device := CkJsonObject__stringOf(json,'response.devices[i].device');
    display_name := CkJsonObject__stringOf(json,'response.devices[i].display_name');
    name := CkJsonObject__stringOf(json,'response.devices[i].name');
    number := CkJsonObject__stringOf(json,'response.devices[i].number');
    v_type := CkJsonObject__stringOf(json,'response.devices[i].type');
    j := 0;
    count_j := CkJsonObject_SizeOfArray(json,'response.devices[i].capabilities');
    while j < count_j do
      begin
        CkJsonObject_putJ(json,j);
        strVal := CkJsonObject__stringOf(json,'response.devices[i].capabilities[j]');
        j := j + 1;
      end;

    i := i + 1;
  end;

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);
CkJsonObject_Dispose(json);

end;