B4X

Azure REST API Access Token

See more Azure OAuth2 Examples

Demonstrates how to request an Azure REST API OAUTH2 access token.

Note: In order to access resources a Service Principal needs to be created in your Tenant. It is really convenient to do it via AZ CLI:

az ad sp create-for-rbac --name [APP_NAME] --password [CLIENT_SECRET]

B4X

Dim success As Boolean = False

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

Dim rest As ChilkatRest
rest.Initialize("rest")

'  URL: https://login.microsoftonline.com/TENANT_ID/oauth2/token
Dim bTls As Boolean = True
Dim port As Int = 443
Dim bAutoReconnect As Boolean = True
success = rest.Connect("login.microsoftonline.com", port, bTls, bAutoReconnect)
If success <> True Then
    Log("ConnectFailReason: " & rest.ConnectFailReason)
    Log(rest.LastErrorText)
    Return
End If


'  Add query params to the request.
rest.AddQueryParam("grant_type", "client_credentials")
rest.AddQueryParam("client_id", "APP_ID")
rest.AddQueryParam("client_secret", "CLIENT_SECRET")
'  Note: The resource must match the API for which you're using the access token..
rest.AddQueryParam("resource", "https://management.azure.com/")

Dim strResponseBody As String = rest.FullRequestFormUrlEncoded("POST", "/TENANT_ID/oauth2/token")
If rest.LastMethodSuccess <> True Then
    Log(rest.LastErrorText)
    Return
End If

Dim respStatusCode As Int = rest.ResponseStatusCode
If respStatusCode >= 400 Then
    Log("Response Status Code = " & respStatusCode)
    Log("Response Header:")
    Log(rest.ResponseHeader)
    Log("Response Body:")
    Log(strResponseBody)
    Return
End If


Dim json As ChilkatJsonObject
json.Initialize
json.Load(strResponseBody)
json.EmitCompact = False
Log(json.Emit)

'  The result is an access token such as the following:

'  {
'    "token_type": "Bearer",
'    "expires_in": "3600",
'    "ext_expires_in": "3600",
'    "expires_on": "1557864616",
'    "not_before": "1557860716",
'    "resource": "https://management.azure.com/",
'    "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
'  }

'  We'll save this JSON to a file for other examples to use..
json.WriteFile("qa_data/tokens/azureToken.json")