/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.jooby.internal.handlers; import static java.util.Objects.requireNonNull; import java.util.LinkedHashSet; import java.util.Set; import org.jooby.MediaType; import org.jooby.Request; import org.jooby.Response; import org.jooby.Route; import org.jooby.Route.Definition; import org.jooby.Status; import com.google.common.base.Joiner; import com.google.inject.Inject; public class OptionsHandler implements Route.Handler { private static final String SEP = ", "; private static final String ALLOW = "Allow"; private Set<Definition> routes; @Inject public OptionsHandler(final Set<Route.Definition> routes) { this.routes = requireNonNull(routes, "Routes are required."); } @Override public void handle(final Request req, final Response rsp) throws Exception { if (!rsp.header(ALLOW).isSet()) { Set<String> allow = new LinkedHashSet<>(); Set<String> methods = new LinkedHashSet<>(Route.METHODS); String path = req.path(); methods.remove(req.method()); for (String method : methods) { routes.stream() .filter(route -> route.matches(method, path, MediaType.all, MediaType.ALL).isPresent()) .forEach(route -> allow.add(route.method())); } rsp.header(ALLOW, Joiner.on(SEP).join(allow)) .length(0) .status(Status.OK); } } }