Show exceptions rescues the original exception

[#5784 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/lib/action_dispatch/middleware/show_exceptions.rb

@@ -62,6 +62,7 @@ module ActionDispatch
     private
       def render_exception(env, exception)
         log_error(exception)
+        exception = original_exception(exception)
 
         request = Request.new(env)
         if @consider_all_requests_local || request.local?
@@ -154,5 +155,17 @@ module ActionDispatch
       def logger
         defined?(Rails.logger) ? Rails.logger : Logger.new($stderr)
       end
+
+    def original_exception(exception)
+      if registered_original_exception?(exception)
+        exception.original_exception
+      else
+        exception
+      end
+    end
+
+    def registered_original_exception?(exception)
+      exception.respond_to?(:original_exception) && @@rescue_responses.has_key?(exception.original_exception.class.name)
+    end
   end
 end

actionpack/test/dispatch/show_exceptions_test.rb

@@ -1,6 +1,7 @@
 require 'abstract_unit'
 
 class ShowExceptionsTest < ActionDispatch::IntegrationTest
+
   Boomer = lambda do |env|
     req = ActionDispatch::Request.new(env)
     case req.path
@@ -12,6 +13,8 @@ class ShowExceptionsTest < ActionDispatch::IntegrationTest
       raise ActionController::NotImplemented
     when "/unprocessable_entity"
       raise ActionController::InvalidAuthenticityToken
+    when "/not_found_original_exception"
+      raise ActionView::Template::Error.new('template', {}, AbstractController::ActionNotFound.new)
     else
       raise "puke!"
     end
@@ -101,4 +104,21 @@ class ShowExceptionsTest < ActionDispatch::IntegrationTest
     assert_response 500
     assert_match("&quot;foo&quot;=&gt;&quot;[FILTERED]&quot;", body)
   end
+
+  test "show registered original exception for wrapped exceptions when consider_all_requests_local is false" do
+    @app = ProductionApp
+    self.remote_addr = '208.77.188.166'
+
+    get "/not_found_original_exception", {}, {'action_dispatch.show_exceptions' => true}
+    assert_response 404
+    assert_match(/404 error/, body)
+  end
+
+  test "show registered original exception for wrapped exceptions when consider_all_requests_local is true" do
+    @app = DevelopmentApp
+
+    get "/not_found_original_exception", {}, {'action_dispatch.show_exceptions' => true}
+    assert_response 404
+    assert_match(/AbstractController::ActionNotFound/, body)
+  end
 end