(VB.NET) 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 .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

Dim integrationKey As String = "DIMS3V5QDVG9J9ABRXC4"
Dim secretKey As String = "HWVQ46nubLBxhnRlKddTltWIi3hL0fIQF2qTvLab"

Dim http As New Chilkat.Http

http.Accept = "application/json"

' Use your own hostname here:
Dim url As String = "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

Dim req As New Chilkat.HttpRequest
req.AddParam("username","matt")

Dim resp As Chilkat.HttpResponse = http.PostUrlEncoded(url,req)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("status code = " & resp.StatusCode)

Dim json As New Chilkat.JsonObject
Dim success As Boolean = 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



Dim device As String
Dim display_name As String
Dim name As String
Dim number As String
Dim v_type As String
Dim j As Integer
Dim count_j As Integer
Dim strVal As String

Dim responseResult As String = json.StringOf("response.result")
Dim responseStatus_msg As String = json.StringOf("response.status_msg")
Dim stat As String = json.StringOf("stat")
Dim i As Integer = 0
Dim count_i As Integer = 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
    End While
    i = i + 1
End While