(VB.NET) Duo Auth API - Async Auth

See more Duo Auth MFA Examples

If you enable async, then your application will be able to retrieve real-time status updates from the authentication process, rather than receiving no information until the process is complete.

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

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

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' 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/auth"

' 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")
req.AddParam("factor","push")
' The device ID can be obtained from the preauth response.  See Duo Preauth Example
req.AddParam("device","DP6GYVTQ5NK82BMR851F")
' Add the async param to get an immediate response, then periodically check for updates to find out when the MFA authentication completes for fails.
req.AddParam("async","1")

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())

If (resp.StatusCode <> 200) Then

    Exit Sub
End If



' Sample successful output:

' status code = 200

' {
'   "stat": "OK",
'   "response": {
'     "txid": "45f7c92b-f45f-4862-8545-e0f58e78075a"
'   }
' }

Dim txid As String = json.StringOf("response.txid")


' Use your own hostname here:
Dim sbUrl As New Chilkat.StringBuilder
sbUrl.Append("https://api-a03782e1.duosecurity.com/auth/v2/auth_status?txid=")
sbUrl.Append(txid)

Debug.WriteLine("Auth status URL: " & sbUrl.GetAsString())

Dim sbResult As New Chilkat.StringBuilder
Dim responseStatus As String
Dim responseStatus_msg As String

' Wait for a response...
Dim i As Integer = 0
Dim maxWaitIterations As Integer = 100
While i < maxWaitIterations
    ' Wait 3 seconds.
    http.SleepMs(3000)

    Debug.WriteLine("Polling...")

    resp = http.QuickRequest("GET",sbUrl.GetAsString())
    If (http.LastMethodSuccess = False) Then
        Debug.WriteLine(http.LastErrorText)
        Exit Sub
    End If


    If (resp.StatusCode <> 200) Then
        Debug.WriteLine("error status code = " & resp.StatusCode)
        Debug.WriteLine(resp.BodyStr)
        Debug.WriteLine("Failed.")

        Exit Sub
    End If


    ' Sample response:

    ' 	{
    ' 	  "stat": "OK",
    ' 	  "response": {
    ' 	    "result": "waiting",
    ' 	    "status": "pushed",
    ' 	    "status_msg": "Pushed a login request to your phone..."
    ' 	  }
    ' 	}

    json.Load(resp.BodyStr)

    ' The responseResult can be "allow", "deny", or "waiting"
    sbResult.Clear()
    json.StringOfSb("response.result",sbResult)
    responseStatus = json.StringOf("response.status")
    responseStatus_msg = json.StringOf("response.status_msg")

    Debug.WriteLine(sbResult.GetAsString())
    Debug.WriteLine(responseStatus)
    Debug.WriteLine(responseStatus_msg)
    Debug.WriteLine("")



    If (sbResult.ContentsEqual("waiting",True) = True) Then
        i = i + 1
    Else
        ' Force loop exit..
        i = maxWaitIterations
    End If

End While

Debug.WriteLine("Finished.")