Catch InvalidURIError on bad paths on redirect.

Handle URI::InvalidURIError errors on the redirect route method, so it
wont raise a 500 if a bad path is given.

actionpack/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Handle InvalidURIError on bad paths on redirect route.
+
+    *arthurnn*
+
 *   Deprecate passing first parameter as `Hash` and default status code for `head` method.
 
     *Mehmet Emin İNAÇ*

actionpack/lib/action_dispatch/routing/redirection.rb

@@ -23,7 +23,11 @@ module ActionDispatch
 
       def serve(req)
         req.check_path_parameters!
+        begin
           uri = URI.parse(path(req.path_parameters, req))
+        rescue URI::InvalidURIError
+          return [ 400, {}, ['Invalid path.'] ]
+        end
 
         unless uri.host
           if relative_path?(uri.path)

actionpack/test/journey/router_test.rb

@@ -219,6 +219,13 @@ module ActionDispatch
         assert_equal 404, resp.first
       end
 
+      def test_invalid_url_path
+        routes = Class.new { include ActionDispatch::Routing::Redirection }.new
+        route = routes.redirect("/foo/bar/%{id}")
+        resp = route.serve(rails_env({ 'REQUEST_METHOD' => 'GET', 'PATH_INFO' => '/foo/(function(){})' }))
+        assert_equal 400, resp.first
+      end
+
       def test_clear_trailing_slash_from_script_name_on_root_unanchored_routes
         route_set = Routing::RouteSet.new
         mapper = Routing::Mapper.new route_set