(Ruby) POP3 GMail XOAUTH2 Authentication

Demonstrates using OAuth2 authentication with pop.gmail.com.

Note: This example requires Chilkat v9.5.0.83 or greater.

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.

mailman = Chilkat::CkMailMan.new()

mailman.put_MailHost("pop.gmail.com")
mailman.put_MailPort(995)
mailman.put_PopSsl(true)

mailman.put_PopUsername("my_account@gmail.com")

# If using OAuth2 authentication, leave the password empty.
mailman.put_PopPassword("")

# Load our previously obtained OAuth2 access token.
# See Getting a GMail POP3 OAuth2 Access Token
jsonToken = Chilkat::CkJsonObject.new()
success = jsonToken.LoadFile("qa_data/tokens/gmail_pop3.json")
if (success == false)
    print jsonToken.lastErrorText() + "\n";
    exit
end

mailman.put_OAuth2AccessToken(jsonToken.stringOf("access_token"))

# Make the TLS connection to the POP3 server.
success = mailman.Pop3Connect()
if (success != true)
    print mailman.lastErrorText() + "\n";
    exit
end

# Authenticate..
success = mailman.Pop3Authenticate()
if (success != true)
    print mailman.lastErrorText() + "\n";
    exit
end

# Find out how many emails are on the server..
numEmails = mailman.CheckMail()
if (numEmails < 0)
    print mailman.lastErrorText() + "\n";
    exit
end

# Examine the POP3 session log:
print mailman.pop3SessionLog() + "\n";

# The POP3 session log will look something like this:

# **** Connected to pop.gmail.com:995
# < +OK Gpop ready for requests from 87.9.200.42 l16mb86351205iok
# > AUTH XOAUTH2 dXNlcj1....VaMDJFAQE=
# < +OK Welcome.
# > STAT
# < +OK 301 1627357
# 
# -- Finished.

# End the POP3 session and close the connection to the GMail server.
success = mailman.Pop3EndSession()
if (success != true)
    print mailman.lastErrorText() + "\n";
    exit
end

print "-- Finished." + "\n";