(VBScript) GMail IMAP Authentication using OAuth2 Access Token

Demonstrates how to do IMAP OAuth2 authentication for GMail (or any other IMAP mail server supporting OAuth2 authentication). This example assumes an OAuth2 access token was previously obtained.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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

' See Get GMail IMAP OAuth2 Access Token for Desktop App 
' for sample code showing how to obtain a GMail IMAP read/write access token.

' In this example, our access token was previously saved to the following file which contains JSON like this:
' 	{
' 	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
' 	 "token_type": "Bearer",
' 	 "expires_in": 3600,
' 	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
' 	}
' 
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")
success = json.LoadFile("qa_data/tokens/_gmailFullAccess.json")
If (success <> 1) Then
    outFile.WriteLine("Failed to load GMail access token file.")
    WScript.Quit
End If

accessToken = json.StringOf("access_token")

' Do OAuth2 authentication by using the access token as the password in the Login method below...
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Imap")
set imap = CreateObject("Chilkat.Imap")

imap.Ssl = 1
imap.Port = 993

' Connect to the GMail IMAP server.
success = imap.Connect("imap.gmail.com")
If (success <> 1) Then
    outFile.WriteLine(imap.LastErrorText)
    WScript.Quit
End If

' Indicate that XOAUTH2 authentication is to be used:
imap.AuthMethod = "XOAUTH2"

' Login
' Use the email address of the GMail account that granted authorization.
success = imap.Login("user@gmail.com",accessToken)
If (success <> 1) Then
    outFile.WriteLine(imap.LastErrorText)
Else
    outFile.WriteLine("Successfully authenticated with GMail IMAP using XOAUTH2!")
End If


outFile.Close