(Ruby) Get Google API Access Token using P12 Service Account Key

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

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

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.
pfx = Chilkat::CkPfx.new()
success = pfx.LoadPfxFile("qa_data/pfx/chilkat25-cbd7b42afbd8.p12","notasecret")
if (success != true)
    print pfx.lastErrorText() + "\n";
    exit
end

gAuth = Chilkat::CkAuthGoogle.new()
success = gAuth.SetP12(pfx)

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

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

# The sub is your company email address
oauth_sub = "info@chilkat.xyz"

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

gAuth.put_EmailAddress(iss)
gAuth.put_Scope(scope)
gAuth.put_ExpireNumSeconds(numSec)
gAuth.put_SubEmailAddress(oauth_sub)

# Connect to www.googleapis.com
tlsSock = Chilkat::CkSocket.new()
success = tlsSock.Connect("www.googleapis.com",443,true,5000)
if (success != true)
    print tlsSock.lastErrorText() + "\n";
    exit
end

# Send the request to obtain the access token.
success = gAuth.ObtainAccessToken(tlsSock)
if (success != true)
    print gAuth.lastErrorText() + "\n";
    exit
end

# Examine the access token:
print "Access Token: " + gAuth.accessToken() + "\n";