(AutoIt) Azure AD Service-to-service access token request

Send an Azure AD service-to-service token request to get an access token using a shared secret.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v1-oauth2-client-creds-grant-flow#service-to-service-access-token-request

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")

; To see the exact HTTP request sent and the response, set the SessionLogFilename property:
$oHttp.SessionLogFilename = "qa_output/chilkatHttpLog.txt"

$oReq = ObjCreate("Chilkat.HttpRequest")

; Set the following request params:
; grant_type 	required 	Specifies the requested grant type. In a Client Credentials Grant flow, the value must be client_credentials.
; 
; client_id 	required 	Specifies the Azure AD client id of the calling web service. 
;     To find the calling application's client ID, in the Azure portal, click Azure Active Directory, click App registrations, click the application. 
;     The client_id is the Application ID
; 
; client_secret 	required 	Enter a key registered for the calling web service or daemon application in Azure AD. 
;     To create a key, in the Azure portal, click Azure Active Directory, click App registrations, click the application, click Settings, click Keys, and add a Key.
;     URL-encode this secret when providing it.
; 
; resource 	required 	Enter the App ID URI of the receiving web service. To find the App ID URI, in the Azure portal, click Azure Active Directory, 
;     click App registrations, click the service application, and then click Settings and Properties.

$oReq.AddParam "grant_type","client_credentials"
$oReq.AddParam "client_id","MY_CLIENT_ID"
$oReq.AddParam "client_secret","MY_CLIENT_SECRET"
$oReq.AddParam "resource","https://service.contoso.com/"

; The URL passed to PostUrlEncoded has this form:   https://login.microsoftonline.com/<tenant_id>/oauth2/token
Local $oResp = $oHttp.PostUrlEncoded("https://login.microsoftonline.com/<tenant_id>/oauth2/token",$oReq)
If ($oHttp.LastMethodSuccess = False) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

Local $iRespStatusCode = $oResp.StatusCode
ConsoleWrite("Response Status Code = " & $iRespStatusCode & @CRLF)

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.EmitCompact = False
$oJson.Load($oResp.BodyStr)
ConsoleWrite("Response JSON:" & @CRLF)
ConsoleWrite($oJson.Emit() & @CRLF)

If ($iRespStatusCode >= 400) Then
    ConsoleWrite("Response Header:" & @CRLF)
    ConsoleWrite($oResp.Header & @CRLF)
    ConsoleWrite("Failed." & @CRLF)

    Exit
EndIf

; Sample response:

; {
;   "token_type": "Bearer",
;   "expires_in": "3599",
;   "ext_expires_in": "3599",
;   "expires_on": "1570059833",
;   "not_before": "1570055933",
;   "resource": "https://adminchilkatsoft.onmicrosoft.com/eb1b8ced-76b7-4845-aec5-d3e91776e345",
;   "access_token": "eyJ0eXAiO ... pmgw"
; }

; To get the items from the JSON....
Local $sToken_type = $oJson.StringOf("token_type")
Local $sExpires_in = $oJson.StringOf("expires_in")
Local $sExt_expires_in = $oJson.StringOf("ext_expires_in")
Local $sExpires_on = $oJson.StringOf("expires_on")
Local $sNot_before = $oJson.StringOf("not_before")
Local $sResource = $oJson.StringOf("resource")
Local $sAccess_token = $oJson.StringOf("access_token")