Added the uppercase and lowercase mutations

lib/logstash/filters/mutate.rb

@@ -80,6 +80,26 @@ class LogStash::Filters::Mutate < LogStash::Filters::Base
   #
   config :gsub, :validate => :array
 
+  # Convert a string to its uppercase equivalent
+  # 
+  # Example:
+  # 
+  # 	mutate {
+  # 	  uppercase => [ "fieldname" ]
+  #		}
+  # 
+  config :uppercase, :validate => :array
+
+  # Convert a string to its lowercase equivalent
+  # 
+  # Example:
+  # 
+  # 	mutate {
+  # 	  lowercase => [ "fieldname" ]
+  #		}
+  # 
+  config :lowercase, :validate => :array
+
   public
   def register
     valid_conversions = %w(string integer float)
@@ -117,6 +137,8 @@ def filter(event)
     replace(event) if @replace
     convert(event) if @convert
     gsub(event) if @gsub
+	uppercase(event) if @uppercase
+	lowercase(event) if @lowercase
 
     filter_matched(event)
   end # def filter
@@ -205,4 +227,27 @@ def gsub(event)
       end
     end # @gsub_parsed.each
   end # def gsub
+
+  private
+  def uppercase(event)
+	 @uppercase.each do |field|
+		 if event[field].is_a?(String)
+		 	event[field].upcase!
+		 else
+			 @logger.debug("Can't uppercase something that isn't a string",
+						   :field => field, :value => event[field])
+		 end
+	 end
+  end # def uppercase
+  private
+  def lowercase(event)
+	 @lowercase.each do |field|
+		 if event[field].is_a?(String)
+			 event[field].downcase!
+		 else
+			 @logger.debug("Can't lowercase something that isn't a string",
+						   :field => field, :value => event[field])
+		 end
+	 end
+  end # def lowercase
 end # class LogStash::Filters::Mutate