Modifing validation for paths

See LOGSTASH-942 for more info

lib/logstash/filters/geoip.rb

@@ -20,7 +20,7 @@ class LogStash::Filters::GeoIP < LogStash::Filters::Base
   #
   # If not specified, this will default to the GeoLiteCity database that ships
   # with logstash.
-  config :database, :validate => :string
+  config :database, :validate => :path
 
   # The field containing IP address, hostname is also OK. If this field is an
   # array, only the first value will be used.

lib/logstash/filters/translate.rb

@@ -21,7 +21,7 @@ class LogStash::Filters::Translate < LogStash::Filters::Base
   # make sure you encase any integer based keys in quotes.
   # For simple string search and replacements for just a few values
   # use the gsub function of the mutate filter.
-  config :dictionary_path, :validate => :string, :required => true
+  config :dictionary_path, :validate => :path, :required => true
 
   # The destination you wish to populate with the response code.    
   # default is http_response_code.  set to the same value as source

lib/logstash/inputs/lumberjack.rb

@@ -17,10 +17,10 @@ class LogStash::Inputs::Lumberjack < LogStash::Inputs::Base
   config :port, :validate => :number, :required => true
 
   # ssl certificate to use
-  config :ssl_certificate, :validate => :string, :required => true
+  config :ssl_certificate, :validate => :path, :required => true
 
   # ssl key to use
-  config :ssl_key, :validate => :string, :required => true
+  config :ssl_key, :validate => :path, :required => true
 
   # ssl key passphrase to use
   config :ssl_key_passphrase, :validate => :password

lib/logstash/inputs/tcp.rb

@@ -43,13 +43,13 @@ class Interrupted < StandardError; end
 
   # ssl CA certificate, chainfile or CA path
   # The system CA path is automatically included
-  config :ssl_cacert, :validate => :string
+  config :ssl_cacert, :validate => :path
 
   # ssl certificate
-  config :ssl_cert, :validate => :string
+  config :ssl_cert, :validate => :path
 
   # ssl key
-  config :ssl_key, :validate => :string
+  config :ssl_key, :validate => :path
 
   # ssl key passphrase
   config :ssl_key_passphrase, :validate => :password, :default => nil

lib/logstash/outputs/lumberjack.rb

@@ -10,7 +10,7 @@ class LogStash::Outputs::Lumberjack < LogStash::Outputs::Base
   config :port, :validate => :number, :required => true
 
   # ssl certificate to use
-  config :ssl_certificate, :validate => :string, :required => true
+  config :ssl_certificate, :validate => :path, :required => true
 
   # window size
   config :window_size, :validate => :number, :default => 5000

lib/logstash/outputs/nagios.rb

@@ -50,7 +50,7 @@ class LogStash::Outputs::Nagios < LogStash::Outputs::Base
   plugin_status "beta"
 
   # The path to your nagios command file
-  config :commandfile, :validate => :string, :default => "/var/lib/nagios3/rw/nagios.cmd"
+  config :commandfile, :validate => :path, :default => "/var/lib/nagios3/rw/nagios.cmd"
 
   # The Nagios check level. Should be one of 0=OK, 1=WARNING, 2=CRITICAL,
   # 3=UNKNOWN. Defaults to 2 - CRITICAL.

lib/logstash/outputs/nagios_nsca.rb

@@ -35,11 +35,11 @@ class LogStash::Outputs::NagiosNsca < LogStash::Outputs::Base
   config :port, :validate => :number, :default => 5667
 
   # The path to the 'send_nsca' binary on the local host.
-  config :send_nsca_bin, :validate => :string, :default => "/usr/sbin/send_nsca"
+  config :send_nsca_bin, :validate => :path, :default => "/usr/sbin/send_nsca"
 
   # The path to the send_nsca config file on the local host.
   # Leave blank if you don't want to provide a config file.
-  config :send_nsca_config, :validate => :string
+  config :send_nsca_config, :validate => :path
 
   # The nagios 'host' you want to submit a passive check result to. This
   # parameter accepts interpolation, e.g. you can use @source_host or other

lib/logstash/outputs/zabbix.rb

@@ -54,7 +54,7 @@ class LogStash::Outputs::Zabbix < LogStash::Outputs::Base
 
   config :host, :validate => :string, :default => "localhost"
   config :port, :validate => :number, :default => 10051
-  config :zabbix_sender, :validate => :string, :default => "/usr/local/bin/zabbix_sender"
+  config :zabbix_sender, :validate => :path, :default => "/usr/local/bin/zabbix_sender"
 
   public
   def register