(VBScript) Microsoft Graph OAuth2 Client Credentials Grant Flow

Demonstrates how to get a Microsoft Graph access token using the Client Credentials Grant Flow.

You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access web-hosted resources by using the identity of an application. This type of grant is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user. These types of applications are often referred to as daemons or service accounts.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

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

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http")
set http = CreateObject("Chilkat.Http")

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.HttpRequest")
set req = CreateObject("Chilkat.HttpRequest")
req.AddParam "client_secret","CLIENT_SECRET"
req.AddParam "client_id","CLIENT_ID"
' Don't know if the scopes valid for the client credentials grant are different than the scopes for the 3-legged Authorization Code Grant...
req.AddParam "scope","https://graph.microsoft.com/.default"
req.AddParam "grant_type","client_credentials"

' Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
url = "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token"
' resp is a Chilkat.HttpResponse
Set resp = http.PostUrlEncoded(url,req)
If (http.LastMethodSuccess <> 1) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

statusCode = resp.StatusCode
outFile.WriteLine("Response status code = " & statusCode)

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")
success = json.Load(resp.BodyStr)

json.EmitCompact = 0
outFile.WriteLine(json.Emit())

' Sample successful output:

' {
'   "token_type": "Bearer",
'   "expires_in": 3599,
'   "ext_expires_in": 3599,
'   "access_token": "eyJ0eX...K0jOERg"
' }

If (statusCode = 200) Then
    success = json.WriteFile("qa_data/tokens/msGraphClientCredentialsToken.json")
    outFile.WriteLine("Success.")
Else
    outFile.WriteLine("Failed.")
End If


outFile.Close