(VB.NET) Group: Refresh OAuth2 Access Token

Refreshes an expired or non-expired OAuth2 access token for the Microsoft Group REST API.

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

Dim json As New Chilkat.JsonObject
Dim success As Boolean = json.LoadFile("qa_data/tokens/msGraphGroup.json")
If (success <> True) Then
    Exit Sub
End If


Dim req As New Chilkat.HttpRequest
req.AddParam("grant_type","refresh_token")
req.AddParam("redirect_uri","http://localhost:3017/")
req.AddParam("client_id","MICROSOFT-GRAPH-CLIENT-ID")
req.AddParam("client_secret","MICROSOFT-GRAPH-CLIENT-SECRET")
req.AddParam("refresh_token",json.StringOf("refresh_token"))
req.AddParam("scope","openid profile offline_access user.readwrite group.readwrite.all files.readwrite")

Dim http As New Chilkat.Http

Dim resp As Chilkat.HttpResponse = http.PostUrlEncoded("https://login.microsoftonline.com/common/oauth2/v2.0/token",req)
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Load the JSON response.
json.Load(resp.BodyStr)
json.EmitCompact = False

' Show the JSON response.
Debug.WriteLine(json.Emit())

Debug.WriteLine("Response status code: " & resp.StatusCode)

' If the response status code is not 200, then it's an error.
If (resp.StatusCode <> 200) Then
    Exit Sub
End If




' Save the refreshed access token JSON to a file for future requests.
Dim fac As New Chilkat.FileAccess
fac.WriteEntireTextFile("qa_data/tokens/msGraphGroup.json",json.Emit(),"utf-8",False)

Debug.WriteLine("Success.")