(Xojo Plugin) 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 Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim http As New Chilkat.Http

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

Dim req As New 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.

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

// The URL passed to PostUrlEncoded has this form:   https://login.microsoftonline.com/<tenant_id>/oauth2/token
Dim resp As Chilkat.HttpResponse
resp = http.PostUrlEncoded("https://login.microsoftonline.com/<tenant_id>/oauth2/token",req)
If (http.LastMethodSuccess = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim respStatusCode As Int32
respStatusCode = resp.StatusCode
System.DebugLog("Response Status Code = " + Str(respStatusCode))

Dim json As New Chilkat.JsonObject
json.EmitCompact = False
success = json.Load(resp.BodyStr)
System.DebugLog("Response JSON:")
System.DebugLog(json.Emit())

If (respStatusCode >= 400) Then
    System.DebugLog("Response Header:")
    System.DebugLog(resp.Header)
    System.DebugLog("Failed.")

    Return
End If

// 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....
Dim token_type As String
token_type = json.StringOf("token_type")
Dim expires_in As String
expires_in = json.StringOf("expires_in")
Dim ext_expires_in As String
ext_expires_in = json.StringOf("ext_expires_in")
Dim expires_on As String
expires_on = json.StringOf("expires_on")
Dim not_before As String
not_before = json.StringOf("not_before")
Dim resource As String
resource = json.StringOf("resource")
Dim access_token As String
access_token = json.StringOf("access_token")