| /* |
| * 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.jena.fuseki.servlets; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.jena.fuseki.Fuseki; |
| import org.apache.jena.riot.web.HttpNames; |
| |
| /** |
| * Addition HTTP Servlet operations. |
| */ |
| public abstract class ServletBase extends HttpServlet { |
| |
| public static final String METHOD_DELETE = "DELETE"; |
| public static final String METHOD_HEAD = "HEAD"; |
| public static final String METHOD_GET = "GET"; |
| public static final String METHOD_OPTIONS = "OPTIONS"; |
| public static final String METHOD_POST = "POST"; |
| public static final String METHOD_PUT = "PUT"; |
| public static final String METHOD_TRACE = "TRACE"; |
| public static final String METHOD_PATCH = "PATCH"; |
| |
| private static AtomicLong requestIdAlloc = new AtomicLong(0); |
| |
| protected ServletBase() {} |
| |
| /** |
| * Helper method which gets a unique request ID and appends it as a header |
| * to the response |
| * |
| * @param request |
| * HTTP Request |
| * @param response |
| * HTTP Response |
| * @return Request ID |
| */ |
| protected static long allocRequestId(HttpServletRequest request, HttpServletResponse response) { |
| long id = requestIdAlloc.incrementAndGet(); |
| addRequestId(response, id); |
| return id; |
| } |
| |
| /** |
| * Helper method for attaching a request ID to a response as a header |
| * |
| * @param response |
| * Response |
| * @param id |
| * Request ID |
| */ |
| protected static void addRequestId(HttpServletResponse response, long id) { |
| response.addHeader("Fuseki-Request-ID", Long.toString(id)); |
| } |
| |
| static final String varyHeaderSetting = String.join(",", |
| HttpNames.hAccept, |
| HttpNames.hAcceptEncoding, |
| HttpNames.hAcceptCharset); |
| |
| public static void setVaryHeader(HttpServletResponse httpResponse) { |
| httpResponse.setHeader(HttpNames.hVary, varyHeaderSetting); |
| } |
| |
| /** Done via web.xml */ |
| public static boolean CORS_ENABLED = false; |
| |
| public static void setCommonHeadersForOptions(HttpServletResponse httpResponse) { |
| if ( CORS_ENABLED ) |
| httpResponse.setHeader(HttpNames.hAccessControlAllowHeaders, "X-Requested-With, Content-Type, Authorization"); |
| httpResponse.setHeader(HttpNames.hContentLength, "0"); |
| setCommonHeaders(httpResponse); |
| } |
| |
| public static void setCommonHeaders(HttpServletResponse httpResponse) { |
| if ( CORS_ENABLED ) |
| httpResponse.setHeader(HttpNames.hAccessControlAllowOrigin, "*"); |
| if ( Fuseki.outputFusekiServerHeader ) |
| httpResponse.setHeader(HttpNames.hServer, Fuseki.serverHttpName); |
| } |
| } |