| /* |
| * 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.apache.camel.component.knative.http; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.function.Predicate; |
| |
| import io.vertx.core.http.HttpServerRequest; |
| import org.apache.camel.Message; |
| import org.apache.camel.component.cloudevents.CloudEvent; |
| import org.apache.camel.component.knative.spi.KnativeResource; |
| |
| public final class KnativeHttpSupport { |
| private KnativeHttpSupport() { |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static void appendHeader(Map<String, Object> headers, String key, Object value) { |
| if (headers.containsKey(key)) { |
| Object existing = headers.get(key); |
| List<Object> list; |
| if (existing instanceof List) { |
| list = (List<Object>) existing; |
| } else { |
| list = new ArrayList<>(); |
| list.add(existing); |
| } |
| list.add(value); |
| value = list; |
| } |
| |
| headers.put(key, value); |
| } |
| |
| public static Predicate<HttpServerRequest> createFilter(CloudEvent cloudEvent, KnativeResource resource) { |
| final Map<String, String> filters = new HashMap<>(); |
| |
| for (Map.Entry<String, String> entry: resource.getFilters().entrySet()) { |
| cloudEvent.attribute(entry.getKey()) |
| .map(CloudEvent.Attribute::http) |
| .ifPresentOrElse( |
| k -> filters.put(k, entry.getValue()), |
| () -> filters.put(entry.getKey(), entry.getValue()) |
| ); |
| } |
| |
| return new Predicate<HttpServerRequest>() { |
| @Override |
| public boolean test(HttpServerRequest request) { |
| if (filters.isEmpty()) { |
| return true; |
| } |
| |
| for (Map.Entry<String, String> entry : filters.entrySet()) { |
| final List<String> values = request.headers().getAll(entry.getKey()); |
| if (values.isEmpty()) { |
| return false; |
| } |
| |
| String val = values.get(values.size() - 1); |
| int idx = val.lastIndexOf(','); |
| |
| if (values.size() == 1 && idx != -1) { |
| val = val.substring(idx + 1); |
| val = val.trim(); |
| } |
| |
| boolean matches = Objects.equals(entry.getValue(), val) || val.matches(entry.getValue()); |
| if (!matches) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| }; |
| } |
| |
| /** |
| * Removes cloud event headers at the end of the processing. |
| */ |
| public static void removeCloudEventHeaders(CloudEvent ce, Message message) { |
| // remove CloudEvent headers |
| for (CloudEvent.Attribute attr : ce.attributes()) { |
| message.removeHeader(attr.http()); |
| message.removeHeader(attr.id()); |
| } |
| } |
| |
| /** |
| * Remap camel headers to cloud event http headers. |
| */ |
| public static void remapCloudEventHeaders(CloudEvent ce, Message message) { |
| // remap CloudEvent camel --> http |
| for (CloudEvent.Attribute attr : ce.attributes()) { |
| Object value = message.getHeader(attr.id()); |
| if (value != null) { |
| message.setHeader(attr.http(), value); |
| } |
| } |
| } |
| |
| } |