AutoIt

Refresh GMail OAuth2 Access Token

See more GMail REST API Examples

Demonstrates how to refresh an expired or soon-to-expire GMail OAuth2 access token. AutoIt

Local $bSuccess = False

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

; It is assumed we previously obtained an OAuth2 access token.
; This example loads the JSON access token file 
; saved by this example: Get GMail OAuth2 Access Token

$oJsonToken = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJsonToken.LoadFile("qa_data/tokens/gmail.json")
If ($bSuccess <> True) Then
    ConsoleWrite("Failed to load googleSheets.json" & @CRLF)
    Exit
EndIf

; The access token JSON looks like this:

; 	{ 
; 	 "access_token": "abac.Ci-ZabcdF37-VUrmSzxbHxTsMbtlN-uPfabcdAQN_2ekzj0s5osCzRabcdTDMGaa2Q",
; 	 "token_type": "Bearer",
; 	 "expires_in": 3600,
; 	 "refresh_token": "1/lEe5abcdNJ77eOSDBabcdkQGVmDalkwabcdR2Hatbo"
; 	}
; 

$oOauth2 = ObjCreate("Chilkat.OAuth2")

$oOauth2.TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"

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

; The response contains a new access token, but we must keep
; our existing refresh token for when we need to refresh again in the future.
$oJsonToken.UpdateString("access_token",$oOauth2.AccessToken)

; 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/gmail.json","utf-8",False)

ConsoleWrite("OAuth2 authorization granted!" & @CRLF)
ConsoleWrite("New Access Token = " & $oOauth2.AccessToken & @CRLF)