/**
* 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);
}
}
}