From 679128da58636f3ec96e24fcb7daac24666b2dad Mon Sep 17 00:00:00 2001
From: Jay Pignata <john.pignata@gmail.com>
Date: Tue, 11 Aug 2009 00:56:46 -0400
Subject: [PATCH] Adding a call to logger from params_parser to give detailed
 debug information when invalid xml or json is posted

[#2481 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
---
 .../middleware/params_parser.rb               |  6 ++++
 .../request/json_params_parsing_test.rb       | 28 ++++++++++++++++---
 .../request/xml_params_parsing_test.rb        | 17 ++++++++++-
 3 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/actionpack/lib/action_dispatch/middleware/params_parser.rb b/actionpack/lib/action_dispatch/middleware/params_parser.rb
index e83cf9236b9fd..ff2b2fe74b49a 100644
--- a/actionpack/lib/action_dispatch/middleware/params_parser.rb
+++ b/actionpack/lib/action_dispatch/middleware/params_parser.rb
@@ -47,6 +47,8 @@ def parse_formatted_parameters(env)
             false
         end
       rescue Exception => e # YAML, XML or Ruby code block errors
+        logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"
+
         raise
           { "body" => request.raw_post,
             "content_type" => request.content_type,
@@ -67,5 +69,9 @@ def content_type_from_legacy_post_data_format_header(env)
 
         nil
       end
+
+      def logger
+        defined?(Rails.logger) ? Rails.logger : Logger.new($stderr)
+      end
   end
 end
diff --git a/actionpack/test/dispatch/request/json_params_parsing_test.rb b/actionpack/test/dispatch/request/json_params_parsing_test.rb
index a3dde72c4e607..db6cf7b330fcb 100644
--- a/actionpack/test/dispatch/request/json_params_parsing_test.rb
+++ b/actionpack/test/dispatch/request/json_params_parsing_test.rb
@@ -30,16 +30,36 @@ def teardown
     )
   end
 
+  test "logs error if parsing unsuccessful" do
+    with_test_routing do
+      begin
+        $stderr = StringIO.new
+        json = "[\"person]\": {\"name\": \"David\"}}"
+        post "/parse", json, {'CONTENT_TYPE' => 'application/json'}
+        assert_response :error
+        $stderr.rewind && err = $stderr.read
+        assert err =~ /Error occurred while parsing request parameters/
+      ensure
+        $stderr = STDERR
+      end
+    end
+  end
+
   private
     def assert_parses(expected, actual, headers = {})
+      with_test_routing do
+        post "/parse", actual, headers
+        assert_response :ok
+        assert_equal(expected, TestController.last_request_parameters)
+      end
+    end
+
+    def with_test_routing
       with_routing do |set|
         set.draw do |map|
           map.connect ':action', :controller => "json_params_parsing_test/test"
         end
-
-        post "/parse", actual, headers
-        assert_response :ok
-        assert_equal(expected, TestController.last_request_parameters)
+        yield
       end
     end
 end
diff --git a/actionpack/test/dispatch/request/xml_params_parsing_test.rb b/actionpack/test/dispatch/request/xml_params_parsing_test.rb
index ee764e726efd1..521002b519d0a 100644
--- a/actionpack/test/dispatch/request/xml_params_parsing_test.rb
+++ b/actionpack/test/dispatch/request/xml_params_parsing_test.rb
@@ -38,6 +38,21 @@ def teardown
     end
   end
 
+  test "logs error if parsing unsuccessful" do
+    with_test_routing do
+      begin
+        $stderr = StringIO.new
+        xml = "<person><name>David</name><avatar type='file' name='me.jpg' content_type='image/jpg'>#{ActiveSupport::Base64.encode64('ABC')}</avatar></pineapple>"
+        post "/parse", xml, default_headers
+        assert_response :error
+        $stderr.rewind && err = $stderr.read
+        assert err =~ /Error occurred while parsing request parameters/
+      ensure
+        $stderr = STDERR
+      end
+    end
+  end
+
   test "parses multiple files" do
     xml = <<-end_body
       <person>
@@ -85,4 +100,4 @@ class LegacyXmlParamsParsingTest < XmlParamsParsingTest
     def default_headers
       {'HTTP_X_POST_DATA_FORMAT' => 'xml'}
     end
-end
+end
\ No newline at end of file