/**
* 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 java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;
import org.jooby.Cookie;
import org.jooby.FlashScope;
import org.jooby.Request;
import org.jooby.Response;
import org.jooby.Route;
public class FlashScopeHandler implements Route.Filter {
private Cookie.Definition template;
private String cname;
private Function<String, Map<String, String>> decoder;
private Function<Map<String, String>, String> encoder;
public FlashScopeHandler(final Cookie.Definition cookie, final Function<String, Map<String, String>> decoder,
final Function<Map<String, String>, String> encoder) {
this.template = cookie;
this.cname = cookie.name().get();
this.decoder = decoder;
this.encoder = encoder;
}
@Override
public void handle(final Request req, final Response rsp, final Route.Chain chain)
throws Throwable {
Optional<String> value = req.cookie(cname).toOptional();
Map<String, String> flashScope = value.map(decoder::apply)
.orElseGet(HashMap::new);
Map<String, String> copy = new HashMap<>(flashScope);
req.set(FlashScope.NAME, flashScope);
// wrap & proceed
rsp.after(finalizeFlash(copy, flashScope));
chain.next(req, rsp);
}
private Route.After finalizeFlash(final Map<String, String> initialScope,
final Map<String, String> scope) {
return (req, rsp, result) -> {
// 1. no change detect
if (scope.equals(initialScope)) {
// 1.a. existing data available, discard
if (scope.size() > 0) {
rsp.cookie(new Cookie.Definition(template).maxAge(0));
}
} else {
// 2. change detected
if (scope.size() == 0) {
// 2.a everything was removed from app logic
rsp.cookie(new Cookie.Definition(template).maxAge(0));
} else {
// 2.b there is something to see in the next request
rsp.cookie(new Cookie.Definition(template).value(encoder.apply(scope)));
}
}
return result;
};
}
}