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# frozen_string_literal: true
require 'mail/network/delivery_methods/smtp'
# Monkey patch mail 2.8.1 to make it possible to disable STARTTLS.
# without having to change existing settings.
# This brings in changes from https://github.com/mikel/mail/pull/1536,
# which has not been released yet.
module Mail
class SMTP
def initialize(values)
self.settings = DEFAULTS
settings[:enable_starttls_auto] = nil
settings.merge!(values)
end
private
# `key` is said to be provided when `settings` has a non-nil value for `key`.
def setting_provided?(key)
!settings[key].nil?
end
# Yields one of `:always`, `:auto` or `false` based on `enable_starttls` and `enable_starttls_auto` flags.
# Yields `false` when `smtp_tls?`.
def smtp_starttls
return false if smtp_tls?
if setting_provided?(:enable_starttls) && settings[:enable_starttls]
# enable_starttls: provided and truthy
case settings[:enable_starttls]
when :auto then :auto
when :always then :always
else
:always
end
elsif setting_provided?(:enable_starttls_auto)
# enable_starttls: not provided or false
settings[:enable_starttls_auto] ? :auto : false
else
# enable_starttls_auto: not provided
# enable_starttls: when provided then false
# use :auto when neither enable_starttls* provided
setting_provided?(:enable_starttls) ? false : :auto
end
end
def smtp_tls?
(setting_provided?(:tls) && settings[:tls]) || (setting_provided?(:ssl) && settings[:ssl])
end
def start_smtp_session(&block)
build_smtp_session.start(settings[:domain], settings[:user_name], settings[:password],
settings[:authentication], &block)
end
def build_smtp_session
if smtp_tls? && (settings[:enable_starttls] || settings[:enable_starttls_auto])
# rubocop:disable Layout/LineLength
raise ArgumentError,
":enable_starttls and :tls are mutually exclusive. Set :tls if you're on an SMTPS connection. Set :enable_starttls if you're on an SMTP connection and using STARTTLS for secure TLS upgrade."
# rubocop:enable Layout/LineLength
end
Net::SMTP.new(settings[:address], settings[:port]).tap do |smtp|
if smtp_tls?
smtp.disable_starttls
smtp.enable_tls(ssl_context)
else
smtp.disable_tls
case smtp_starttls
when :always
smtp.enable_starttls(ssl_context)
when :auto
smtp.enable_starttls_auto(ssl_context)
else
smtp.disable_starttls
end
end
smtp.open_timeout = settings[:open_timeout] if settings[:open_timeout]
smtp.read_timeout = settings[:read_timeout] if settings[:read_timeout]
end
end
end
end
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