(VB.NET UWP/WinRT) Office365 OAuth2 Resource Owner Password Credentials Grant for SMTP, IMAP, POP

Demonstrates how to get an OAuth2 access token for use with Office 365 in the SMTP, IMAP, and POP3 protocols using the resource owner password credentials grant.

This is a way of getting an OAuth2 access token for the O365 account you own, WITHOUT needing to grant access interactively via a browser.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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


' Get an OAuth2 access token by sending a POST like this:

' 	POST {tenant}/oauth2/v2.0/token
' 	Host: login.microsoftonline.com
' 	Content-Type: application/x-www-form-urlencoded
' 
' 	client_id=6731de76-14a6-49ae-97bc-6eba6914391e
' 	&client_secret=*****************
' 	&scope=user.read%20openid%20profile%20offline_access
' 	&username=MyUsername@myTenant.com
' 	&password=SuperS3cret
' 	&grant_type=password

Dim http As New Chilkat.Http

Dim req As New Chilkat.HttpRequest

' Use the application ID for the client_id.
' (In Azure App Registrations, use the Application (client) ID)
req.AddParam("client_id","CLIENT_ID")
req.AddParam("client_secret","CLIENT_SECRET")

req.AddParam("scope","openid profile offline_access https://outlook.office365.com/SMTP.Send https://outlook.office365.com/POP.AccessAsUser.All https://outlook.office365.com/IMAP.AccessAsUser.All")
req.AddParam("username","my_email_address")
req.AddParam("password","my_email_password")
req.AddParam("grant_type","password")

Dim resp As Chilkat.HttpResponse
' Replace "{tenant}" with your tenant ID, such as "112d7ed6-71bf-4eba-a866-738364321bfc".
resp = Await http.PostUrlEncodedAsync("https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token",req)
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim statusCode As Integer = resp.StatusCode
Debug.WriteLine("response status code: " & statusCode)
Debug.WriteLine("response body:")
Debug.WriteLine(resp.BodyStr)

' The successful JSON response looks like this:


' 
' {
'   "token_type": "Bearer",
'   "scope": "https://outlook.office365.com/IMAP.AccessAsUser.All https://outlook.office365.com/POP.AccessAsUser.All https://outlook.office365.com/SMTP.Send",
'   "expires_in": 3599,
'   "ext_expires_in": 3599,
'   "access_token": "eyJ0eX ... 62Nyw",
'   "refresh_token": "0.AAAA1n4t ... tNxyA",
'   "id_token": "eyJ0eXA ... qdIGyOYw"
' }

' Save the JSON to a file for future requests.
If (statusCode = 200) Then
    Dim fac As New Chilkat.FileAccess
    fac.WriteEntireTextFile("qa_data/tokens/office365.json",resp.BodyStr,"utf-8",False)
End If