Add log for request headers (#28)

* log for request headers

* add specification

* fix spec

* optimize readme

README.md

@@ -51,7 +51,8 @@ You can include logging of other parts of the request / response cycle by includ
         logger: logger,
         include: [ GrapeLogging::Loggers::Response.new,
                    GrapeLogging::Loggers::FilterParameters.new,
-                   GrapeLogging::Loggers::ClientEnv.new ]
+                   GrapeLogging::Loggers::ClientEnv.new,
+                   GrapeLogging::Loggers::RequestHeaders.new ]
     end
 
 #### FilterParameters
@@ -60,6 +61,9 @@ The `FilterParameters` logger will filter out sensitive parameters from your log
 #### ClientEnv
 The `ClientEnv` logger will add `ip` and user agent `ua` in your log.
 
+#### RequestHeaders
+The `RequestHeaders` logger will add `request headers` in your log.
+
 ### Logging to file and STDOUT
 
 You can log to file and STDOUT at the same time, you just need to assign new logger

lib/grape_logging.rb

@@ -6,6 +6,7 @@ require 'grape_logging/loggers/base'
 require 'grape_logging/loggers/response'
 require 'grape_logging/loggers/filter_parameters'
 require 'grape_logging/loggers/client_env'
+require 'grape_logging/loggers/request_headers'
 require 'grape_logging/reporters/active_support_reporter'
 require 'grape_logging/reporters/logger_reporter'
 require 'grape_logging/timings'

lib/grape_logging/loggers/request_headers.rb

@@ -0,0 +1,23 @@
+module GrapeLogging
+  module Loggers
+    class RequestHeaders < GrapeLogging::Loggers::Base
+
+      HTTP_PREFIX = 'HTTP_'.freeze
+
+      def parameters(request, _)
+        headers = {}
+
+        request.env.each_pair do |k, v|
+          next unless k.to_s.start_with? HTTP_PREFIX
+
+          k = k[5..-1].split('_').each(&:capitalize!).join('-')
+          headers[k] = v
+        end
+
+        { headers: headers }
+      end
+
+
+    end
+  end
+end