deep symbolize keys on messages

lib/travis/hub/handler.rb

@@ -1,11 +1,12 @@
 require 'travis/hub/helper/context'
+require 'travis/hub/helper/hash'
 require 'travis/hub/helper/string'
 require 'travis/hub/service'
 
 module Travis
   module Hub
     class Handler
-      include Helper::Context, Helper::String
+      include Helper::Context, Helper::Hash, Helper::String
 
       attr_reader :context, :type, :event, :payload, :object
 
@@ -46,7 +47,7 @@ def normalize_event(event)
         end
 
         def normalize_payload(payload)
-          payload = payload.symbolize_keys
+          payload = deep_symbolize_keys(payload)
           payload = normalize_state(payload)
           normalize_timestamps(payload)
         end

lib/travis/hub/helper/hash.rb

@@ -0,0 +1,21 @@
+module Travis
+  module Hub
+    module Helper
+      module Hash
+        def deep_symbolize_keys(hash)
+          hash.map do |key, obj|
+            obj = case obj
+            when Array
+              obj.map { |obj| deep_symbolize_keys(obj) }
+            when ::Hash
+              deep_symbolize_keys(obj)
+            else
+              obj
+            end
+            [key.to_sym, obj]
+          end.to_h
+        end
+      end
+    end
+  end
+end