(AutoIt) 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

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

$oHttp = ObjCreate("Chilkat.Http")

$oReq = ObjCreate("Chilkat.HttpRequest")
$oReq.AddParam "client_secret","CLIENT_SECRET"
$oReq.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...
$oReq.AddParam "scope","https://graph.microsoft.com/.default"
$oReq.AddParam "grant_type","client_credentials"

; Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
Local $sUrl = "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token"
Local $oResp = $oHttp.PostUrlEncoded($sUrl,$oReq)
If ($oHttp.LastMethodSuccess <> True) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

Local $iStatusCode = $oResp.StatusCode
ConsoleWrite("Response status code = " & $iStatusCode & @CRLF)

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.Load($oResp.BodyStr)

$oJson.EmitCompact = False
ConsoleWrite($oJson.Emit() & @CRLF)

; Sample successful output:

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

If ($iStatusCode = 200) Then
    $oJson.WriteFile("qa_data/tokens/msGraphClientCredentialsToken.json")
    ConsoleWrite("Success." & @CRLF)
Else
    ConsoleWrite("Failed." & @CRLF)
EndIf