(VB.NET) Microsoft Teams OAuth2 Client Credentials Authentication

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Note: This example requires Chilkat v11.0.0 or greater.

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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.
' This is the new "Integrated OAuth2 Client Credentials" feature introduced in Chilkat v9.5.0.96.  
Dim jsonOAuthCC As New Chilkat.JsonObject

' --------------------------------------------------------------------------------------------------------
' You'll need to have registered an app in Azure beforehand.
' 
' Note: Creating a Team requires the following Application permissions:
' Team.Create, Teamwork.Migrate.All, Group.ReadWrite.All**, Directory.ReadWrite.All**
' 
' See How to Create an Azure App Registration for OAuth 2.0 Client Credentials
' --------------------------------------------------------------------------------------------------------

' Use the values from your App Registration in Azure.
jsonOAuthCC.UpdateString("client_id","e1cd2318-xxxx-4916-bfd6-xxxxxxxxxxxx")
jsonOAuthCC.UpdateString("client_secret","K.d8Q~RoJxxxxvCj_u_xxxxxxxxxxxxxxxxxxxxx")

' 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.  Use your tenant ID (not the tenant ID shown here).
jsonOAuthCC.UpdateString("token_endpoint","https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/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()

' ------------------------------------------------------------------------------
' To create a Microsoft Team, we want to send an HTTP request like the following:
' 
' Note: The following is the minimal JSON for a request using Applicaton permissions (i.e. the access token retrieved using the client credentials grant).
' 
' POST https://graph.microsoft.com/v1.0/teams
' Content-Type: application/json
' 
' {
'    "template@odata.bind":"https://graph.microsoft.com/v1.0/teamsTemplates('standard')",
'    "displayName":"My Sample Team",
'    "description":"My Sample Team�s Description",
'    "members":[
'       {
'          "@odata.type":"#microsoft.graph.aadUserConversationMember",
'          "roles":[
'             "owner"
'          ],
'          "user@odata.bind":"https://graph.microsoft.com/v1.0/users('0040b377-61d8-43db-94f5-81374122dc7e')"
'       }
'    ]
' }

Dim json As New Chilkat.JsonObject
json.UpdateString("""template@odata.bind""","https://graph.microsoft.com/v1.0/teamsTemplates('standard')")
json.UpdateString("displayName","My Sample Team")
json.UpdateString("description","My Sample Team�s Description")
json.UpdateString("members[0].""@odata.type""","#microsoft.graph.aadUserConversationMember")
json.UpdateString("members[0].roles[0]","owner")
json.UpdateString("members[0].""user@odata.bind""","https://graph.microsoft.com/v1.0/users('4ee732c3-322e-4a6b-b729-2fd1eb5c6004')")

json.EmitCompact = False
Debug.WriteLine(json.Emit())

http.SetRequestHeader("Content-type","application/json")

Dim resp As New Chilkat.HttpResponse
success = http.HttpJson("POST","https://graph.microsoft.com/v1.0/teams",json,"application/json",resp)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' A successful response is indicated by a 202 response status code and an empty response body.
Debug.WriteLine("Response Status Code: " & resp.StatusCode)
Debug.WriteLine("Response Body:")
Debug.WriteLine(resp.BodyStr)

If (resp.StatusCode >= 400) Then
    Debug.WriteLine("Response Header:")
    Debug.WriteLine(resp.Header)
    Debug.WriteLine("Failed.")
End If