Lua

Get Google API Access Token using P12 Service Account Key

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Demonstrates how to get a Google API access token using a P12 service account key. Lua

local chilkat = require("chilkat")

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

-- --------------------------------------------------------------------------------
-- 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
-- --------------------------------------------------------------------------------

-- First load the PKCS12 (.p12 / .pfx) into a PFX object.
local pfx = chilkat.Pfx.new()
local success = pfx:load_pfx_file("qa_data/pfx/chilkat25-cbd7b42afbd8.p12", "notasecret")
if not success then
    print(pfx.last_error_text)
    return
end

local gAuth = chilkat.AuthGoogle.new()
success = gAuth:set_p12(pfx)

-- 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 = "info@chilkat.xyz"

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

gAuth.email_address = iss
gAuth.scope = scope
gAuth.expire_num_seconds = numSec
gAuth.sub_email_address = oauth_sub

-- Connect to www.googleapis.com
local tlsSock = chilkat.Socket.new()
success = tlsSock:connect("www.googleapis.com", 443, true, 5000)
if not success then
    print(tlsSock.last_error_text)
    return
end

-- Send the request to obtain the access token.
success = gAuth:obtain_access_token(tlsSock)
if not success then
    print(gAuth.last_error_text)
    return
end

-- Examine the access token:
print("Access Token: " .. gAuth.access_token)