AutoIt Requires Chilkat v10.1.2+

Get GMail SMTP OAuth2 Access Token for Desktop App

See more OAuth2 Examples

This example show how to obtain a Gmail SMTP OAuth2 access token from a desktop application or script, enabling the use of XOAUTH2 authentication. AutoIt

Local $bSuccess = False

;  To further clarify, see OAuth 2.0 Authorization Flow

$oOauth2 = ObjCreate("Chilkat.OAuth2")

;  For Google OAuth2, set the listen port equal to the port used
;  in the Authorized Redirect URL for the Client ID.
;  For example, in this case the Authorized Redirect URL would be http://localhost:55568/
;  Your app should choose a port not likely not used by any other application.
$oOauth2.ListenPort = 55568

$oOauth2.AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
$oOauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

;  Replace these with actual values.
$oOauth2.ClientId = "GOOGLE-CLIENT-ID"
$oOauth2.ClientSecret = "GOOGLE-CLIENT-SECRET"

;  To use Gmail's OAuth2 for sending emails via the SMTP protocol, you need to request the https://mail.google.com/ scope. 
;  See About GMail SMTP OAuth2 Scopes
$oOauth2.Scope = "https://mail.google.com/"

;  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
Local $sUrl = $oOauth2.StartAuth()
If ($oOauth2.LastMethodSuccess <> True) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

;  Launch the default browser on the system and navigate to the url.
;  The LaunchBrowser method was added in Chilkat v10.1.2.
$bSuccess = $oOauth2.LaunchBrowser($sUrl)
If ($bSuccess = False) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

;  Wait for the user to approve or deny authorization in the browser.
Local $iNumMsWaited = 0
While ($iNumMsWaited < 90000) And ($oOauth2.AuthFlowState < 3)
    $oOauth2.SleepMs 100
    $iNumMsWaited = $iNumMsWaited + 100
Wend

;  If the browser does not respond within the specified time, AuthFlowState will be:
;  
;  1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
;  2: Waiting for Final Response – The thread is awaiting the final access token response.
;  In either case, cancel the background task initiated by StartAuth.

If ($oOauth2.AuthFlowState < 3) Then
    $oOauth2.Cancel()
    ConsoleWrite("No response from the browser!" & @CRLF)
    Exit
EndIf

;  Check AuthFlowState to determine if authorization was granted, denied, or failed:
;  
;  3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
;  4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
;  5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

If ($oOauth2.AuthFlowState = 5) Then
    ConsoleWrite("OAuth2 failed to complete." & @CRLF)
    ConsoleWrite($oOauth2.FailureInfo & @CRLF)
    Exit
EndIf

If ($oOauth2.AuthFlowState = 4) Then
    ConsoleWrite("OAuth2 authorization was denied." & @CRLF)
    ConsoleWrite($oOauth2.AccessTokenResponse & @CRLF)
    Exit
EndIf

If ($oOauth2.AuthFlowState <> 3) Then
    ConsoleWrite("Unexpected AuthFlowState:" & $oOauth2.AuthFlowState & @CRLF)
    Exit
EndIf

;  Save the full JSON access token response to a file.
$oSbJson = ObjCreate("Chilkat.StringBuilder")
$oSbJson.Append($oOauth2.AccessTokenResponse)
$oSbJson.WriteFile("qa_data/tokens/_gmailSmtp.json","utf-8",False)

;  The saved JSON response looks like this:

;  	{
;  	 "access_token": "ya39.Ci-XA_C5bGgRDC3UaD-h0_NeL-DVIQnI2gHtBBBHkZzrwlARkwX6R3O0PCDEzRlfaQ",
;  	 "token_type": "Bearer",
;  	 "expires_in": 3600,
;  	 "refresh_token": "1/r_2c_7jddspcdfesrrfKqfXtqo08D6Q-gUU0DsdfVMsx0c"
;  	}
;  
ConsoleWrite("OAuth2 authorization granted!" & @CRLF)
ConsoleWrite("Access Token = " & $oOauth2.AccessToken & @CRLF)