Change syntax for routes with filename

Previously, the filename was URL-encoded, thus each / was replaced with %2F. This caused issues with some Apache2 configuration, smartly mingling with the URL to either encode it a second time (resulting in %252F) or decoding it (generating a real /). However, for authenticated file downloads with the JWT, we hardly require a byte-by-byte matching. With these changes, the URL parameter is no longer URL-encoded, so that Apache2 won't break our implementation any longer.

Further, we use this opportunity to get rid of the unnecessary .json extension for those filename routes, simplifying the routes generated and doing some further cleanup.

spec/controllers/submissions_controller_spec.rb

@@ -279,19 +279,9 @@ RSpec.describe SubmissionsController do
       expect_assigns(submission: :submission)
       expect_http_status(:ok)
 
-      %i[run test].each do |action|
-        describe "##{action}_url" do
-          let(:url) { response.parsed_body.with_indifferent_access.fetch("#{action}_url") }
-
-          it "starts like the #{action} path" do
-            filename = File.basename(__FILE__)
-            expect(url).to start_with(Rails.application.routes.url_helpers.send(:"#{action}_submission_path", submission, filename).sub(filename, ''))
-          end
-
-          it 'ends with a placeholder' do
-            expect(url).to end_with("#{Submission::FILENAME_URL_PLACEHOLDER}.json")
-          end
-        end
+      it 'includes the desired fields' do
+        expect(response.parsed_body.keys).to include('id', 'files')
+        expect(response.parsed_body['files'].first.keys).to include('id', 'file_id')
       end
 
       describe '#render_url' do
@@ -307,14 +297,6 @@ RSpec.describe SubmissionsController do
           expect(url).to include '?token='
         end
       end
-
-      describe '#score_url' do
-        let(:url) { response.parsed_body.with_indifferent_access.fetch('score_url') }
-
-        it 'corresponds to the score path' do
-          expect(url).to eq(Rails.application.routes.url_helpers.score_submission_path(submission, format: :json))
-        end
-      end
     end
 
     describe 'GET #test' do