(Visual Basic 6.0) Duo Auth API - Async Auth

See more Duo Auth MFA Examples

Note: This example requires Chilkat v11.0.0 or greater.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim success As Long
success = 0

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

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

Dim http As New ChilkatHttp

http.Accept = "application/json"

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

req.HttpVerb = "POST"
req.ContentType = "application/x-www-form-urlencoded"

Dim resp As New ChilkatHttpResponse
success = http.HttpReq(url,req,resp)
If (success = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Debug.Print "status code = " & resp.StatusCode

Dim json As New ChilkatJsonObject
success = json.Load(resp.BodyStr)
json.EmitCompact = 0
Debug.Print 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
txid = json.StringOf("response.txid")

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

Debug.Print "Auth status URL: " & url

Dim sbResult As New ChilkatStringBuilder
Dim responseStatus As String
Dim responseStatus_msg As String

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

    Debug.Print "Polling..."

    success = http.HttpNoBody("GET",url,resp)
    If (success = 0) Then
        Debug.Print http.LastErrorText
        Exit Sub
    End If

    If (resp.StatusCode <> 200) Then
        Debug.Print "error status code = " & resp.StatusCode
        Debug.Print resp.BodyStr
        Debug.Print "Failed."
        Exit Sub
    End If

    ' Sample response:

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

    success = json.Load(resp.BodyStr)

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

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

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

Loop

Debug.Print "Finished."