VB.NET

SharePoint OAuth2 Client Credentials Authentication

Demonstrates how to authenticate with OAuth 2.0 using the client credentials grant type. This is for SharePoint Online which is the cloud-based service provided by Microsoft as part of Office 365. (Users access SharePoint Online through a web browser, and the service is hosted on Microsoft's servers.) VB.NET

Dim success As Boolean = False

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

Dim http As New Chilkat.Http

' Provide the information needed for Chilkat to automatically fetch the OAuth2.0 
' access token as needed.
Dim jsonOAuthCC As New Chilkat.JsonObject

' --------------------------------------------------------------------------------------------------------
' You'll need to have registered an app in Azure beforehand.
' See How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
' --------------------------------------------------------------------------------------------------------

' Use the values from your App Registration in Azure.
jsonOAuthCC.UpdateString("client_id","CLIENT_ID")
jsonOAuthCC.UpdateString("client_secret","SECRET_VALUE")

' You'll always use this scope for client credentials, because the allowed actions
' are determined by the App Permissions defined when you registered the app in Azure.
jsonOAuthCC.UpdateString("scope","https://graph.microsoft.com/.default")

' The token endpoint includes your tenant ID. 
jsonOAuthCC.UpdateString("token_endpoint","https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token")

' Provide the OAuth2 information. Chilkat will use this information to automatically fetch the OAuth2 access token as needed,
http.AuthToken = jsonOAuthCC.Emit()

' Get information about all SharePoint sites.
Dim sbJson As New Chilkat.StringBuilder
success = http.QuickGetSb("https://graph.microsoft.com/v1.0/sites/getAllSites",sbJson)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim statusCode As Integer = http.LastStatus

Debug.WriteLine("Response status code = " & statusCode)

If (statusCode <> 200) Then
    Debug.WriteLine(sbJson.GetAsString())
    Debug.WriteLine("Failed.")
    Exit Sub
End If


Dim jsonResp As New Chilkat.JsonObject
jsonResp.LoadSb(sbJson)
jsonResp.EmitCompact = False

Debug.WriteLine(jsonResp.Emit())
Debug.WriteLine("Success.")

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON