(AutoIt) POP3 Auto-Refresh Office365 Access Token

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Demonstrates how to automatically recover from an expired OAuth2 access token when OAuth2 authentication fails in the POP3 protocol. If the server responds with "-ERR Authentication failure: unknown user name or bad password.", then we refresh the access token and retry.

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

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

$oMailman = ObjCreate("Chilkat.MailMan")

$oMailman.MailHost = "outlook.office365.com"
$oMailman.MailPort = 995
$oMailman.PopSsl = True

; Use your O365 email address here.
$oMailman.PopUsername = "OFFICE365_EMAIL_ADDRESS"

; When using OAuth2 authentication, leave the password empty.
$oMailman.PopPassword = ""

; Load our previously obtained OAuth2 access token.
$oJsonToken = ObjCreate("Chilkat.JsonObject")
Local $bSuccess = $oJsonToken.LoadFile("qa_data/tokens/office365.json")
If ($bSuccess = False) Then
    ConsoleWrite($oJsonToken.LastErrorText & @CRLF)
    Exit
EndIf

$oMailman.OAuth2AccessToken = $oJsonToken.StringOf("access_token")

; Make the TLS connection to the outlook.office365.com POP3 server.
$bSuccess = $oMailman.Pop3Connect()
If ($bSuccess <> True) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
    Exit
EndIf

; Authenticate using XOAUTH2
$bSuccess = $oMailman.Pop3Authenticate()
If ($bSuccess <> True) Then
    ; If we're still connected to the mail server, then it means the server sent a non-success response,
    ; Such as:  -ERR Authentication failure: unknown user name or bad password.
    If ($oMailman.IsPop3Connected = True) Then

        ; Refresh the OAuth2 access token, and if successful, save the new (refreshed) access token and try authenticating again.
        $oOauth2 = ObjCreate("Chilkat.OAuth2")

        ; Use your actual Directory (tenant) ID instead of "112d7ed6-71bf-4eba-a866-738364321bfc"
        $oOauth2.TokenEndpoint = "https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/oauth2/v2.0/token"

        ; Replace these with your Azure App Registration's actual values.
        $oOauth2.ClientId = "CLIENT_ID"
        $oOauth2.ClientSecret = "CLIENT_SECRET"

        ; Get the "refresh_token"
        $oOauth2.RefreshToken = $oJsonToken.StringOf("refresh_token")

        ; Send the HTTP POST to refresh the access token..
        $bSuccess = $oOauth2.RefreshAccessToken()
        If ($bSuccess <> True) Then
            ConsoleWrite($oOauth2.LastErrorText & @CRLF)
            Exit
        EndIf

        ConsoleWrite("New access token: " & $oOauth2.AccessToken & @CRLF)
        ConsoleWrite("New refresh token: " & $oOauth2.RefreshToken & @CRLF)

        ; Update the JSON with the new tokens.
        $oJsonToken.UpdateString("access_token",$oOauth2.AccessToken)
        $oJsonToken.UpdateString("refresh_token",$oOauth2.RefreshToken)

        ; Save the new JSON access token response to a file.
        $oSbJson = ObjCreate("Chilkat.StringBuilder")
        $oJsonToken.EmitCompact = False
        $oJsonToken.EmitSb($oSbJson)
        $oSbJson.WriteFile("qa_data/tokens/office365.json","utf-8",False)

        ConsoleWrite("New Access Token = " & $oOauth2.AccessToken & @CRLF)

        ; Update the mailman with the new access token.
        $oMailman.OAuth2AccessToken = $oOauth2.AccessToken

        ; Retry the authentication.
        $bSuccess = $oMailman.Pop3Authenticate()
        If ($bSuccess = False) Then
            ConsoleWrite($oMailman.LastErrorText & @CRLF)
            Exit
        EndIf

    Else
        ConsoleWrite($oMailman.LastErrorText & @CRLF)
        Exit
    EndIf

EndIf

; Find out how many emails are on the server..
Local $iNumEmails = $oMailman.CheckMail()
If ($iNumEmails < 0) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
    Exit
EndIf

; Examine the POP3 session log:
ConsoleWrite($oMailman.Pop3SessionLog & @CRLF)

; The POP3 session log will look something like this:

; **** Connected to outlook.office365.com:995
; < +OK The Microsoft Exchange POP3 service is ready. [QwBIADIAUABSADEANgBDAEEAMAAwADEAMgAuAG4AYQBtAHAAcgBkADEANgAuAHAAcgBvAGQALgBvAHUAdABsAG8AbwBrAC4AYwBvAG0A]
; > AUTH XOAUTH2
; < + 
; > <base64 string in XOAUTH2 format>
; < -ERR Authentication failure: unknown user name or bad password.
; > AUTH XOAUTH2
; < + 
; > <base64 string in XOAUTH2 format>
; < +OK User successfully authenticated.
; > STAT
; < +OK 248 46637086

; End the POP3 session and close the connection to the GMail server.
$bSuccess = $oMailman.Pop3EndSession()
If ($bSuccess <> True) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Finished." & @CRLF)