Add configuration option to optionally disable deep_munge

2 files changed, 8 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/railtie.rb b/actionpack/lib/action_dispatch/railtie.rb
index 2dfaab3587..ddeea24bb3 100644
--- a/actionpack/lib/action_dispatch/railtie.rb
+++ b/actionpack/lib/action_dispatch/railtie.rb
@@ -16,6 +16,7 @@ module ActionDispatch
     config.action_dispatch.signed_cookie_salt = 'signed cookie'
     config.action_dispatch.encrypted_cookie_salt = 'encrypted cookie'
     config.action_dispatch.encrypted_signed_cookie_salt = 'signed encrypted cookie'
+    config.action_dispatch.perform_deep_munge = true
 
     config.action_dispatch.default_headers = {
       'X-Frame-Options' => 'SAMEORIGIN',
@@ -28,6 +29,7 @@ module ActionDispatch
     initializer "action_dispatch.configure" do |app|
       ActionDispatch::Http::URL.tld_length = app.config.action_dispatch.tld_length
       ActionDispatch::Request.ignore_accept_header = app.config.action_dispatch.ignore_accept_header
+      ActionDispatch::Request::Utils.perform_deep_munge = app.config.action_dispatch.perform_deep_munge
       ActionDispatch::Response.default_charset = app.config.action_dispatch.default_charset || app.config.encoding
       ActionDispatch::Response.default_headers = app.config.action_dispatch.default_headers
 
diff --git a/actionpack/lib/action_dispatch/request/utils.rb b/actionpack/lib/action_dispatch/request/utils.rb
index 8b43cdada8..a6dca9741c 100644
--- a/actionpack/lib/action_dispatch/request/utils.rb
+++ b/actionpack/lib/action_dispatch/request/utils.rb
@@ -1,9 +1,15 @@
 module ActionDispatch
   class Request < Rack::Request
     class Utils # :nodoc:
+
+      mattr_accessor :perform_deep_munge
+      self.perform_deep_munge = true
+
       class << self
         # Remove nils from the params hash
         def deep_munge(hash)
+          return hash unless perform_deep_munge
+
           hash.each do |k, v|
             case v
             when Array