Added support for implicit FTPS and gem dependencies (#3)

* Added support for implicit FTPS and gem dependencies

* changes per @eheydrick comments

CHANGELOG.md

@@ -4,6 +4,11 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This CHANGELOG follows the format listed at [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
+### Added
+- check-ftp.rb: added support for implicit FTPS. (@swibowo)
+
+### Changed
+- Define `net` and `double-bag-ftps` dependency (@swibowo)
 
 ## [1.0.0] - 2017-05-14
 ### Added

bin/check-ftp.rb

@@ -63,6 +63,10 @@ class CheckFTP < Sensu::Plugin::Check::CLI
          short: '-t SECS',
          proc: proc(&:to_i),
          default: 15
+  option :implicit_ftps,
+         short: '-i',
+         boolean: true,
+         default: false
 
   def write_file
     file = Tempfile.new("sensu_#{Time.now.to_i}.txt")
@@ -114,6 +118,9 @@ def ftps_login
       ftps.ssl_context = DoubleBagFTPS.create_ssl_context(
         verify_mode: verify
       )
+      if config[:implicit_ftps]
+        ftps.ftps_mode = DoubleBagFTPS::IMPLICIT
+      end
       ftps.connect(config[:host])
       ftps
     rescue => e

sensu-plugins-ftp.gemspec

@@ -29,7 +29,8 @@ Gem::Specification.new do |s|
   s.test_files             = s.files.grep(%r{^(test|spec|features)/})
   s.version                = SensuPluginsFtp::Version::VER_STRING
 
-  s.add_runtime_dependency 'sensu-plugin', '~> 1.2'
+  s.add_runtime_dependency 'sensu-plugin',                  '~> 1.2'
+  s.add_runtime_dependency 'double-bag-ftps',               '~> 0.1.3'
 
   s.add_development_dependency 'bundler',                   '~> 1.7'
   s.add_development_dependency 'codeclimate-test-reporter', '~> 0.4'