Lua

Get XOAUTH2 Access Token from Google OAuth 2.0 Authorization Server

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Obtains an OAUTH2 access token from the Google OAuth 2.0 Authorization Server. This is for Server to server applications using Google API's that need an access token. See https://developers.google.com/accounts/docs/OAuth2ServiceAccount Lua

local chilkat = require("chilkat")

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

local http = chilkat.Http.new()

-- --------------------------------------------------------------------------------
-- For a step-by-step guide for setting up your Google Workspace service account,
-- see Setup Google Workspace Account for Sending SMTP GMail from a Service Account
-- --------------------------------------------------------------------------------
-- Begin by loading your Google service account key (.p12)
local cert = chilkat.Cert.new()
local success = cert:load_pfx_file("c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12", "notasecret")
if not success then
    print(cert.last_error_text)
    return
end

-- The ISS is your service account email address ending in gserviceaccount.com.
local iss = "chilkatsvc@chilkat25.iam.gserviceaccount.com"

-- The scope is always the following string:
local scope = "https://mail.google.com/"

-- The sub is your company email address
local oauth_sub = "bob@yourcompany.com"

-- The access token is valid for this number of seconds.
local numSec = 3600

local accessToken = http:g_svc_oauth_access_token(iss, scope, oauth_sub, numSec, cert)
if not http.last_method_success then
    print(http.last_error_text)
    return
else
    print("access token: " .. accessToken)
end

-- The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one.