| /* |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.client5.http.impl.cache; |
| |
| import java.util.Iterator; |
| |
| import org.apache.hc.client5.http.cache.HeaderConstants; |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.HeaderElement; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpVersion; |
| import org.apache.hc.core5.http.ProtocolVersion; |
| import org.apache.hc.core5.http.message.MessageSupport; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| |
| /** |
| * Determines if an HttpRequest is allowed to be served from the cache. |
| * |
| * @since 4.1 |
| */ |
| @Contract(threading = ThreadingBehavior.IMMUTABLE) |
| class CacheableRequestPolicy { |
| |
| private final Logger log = LogManager.getLogger(getClass()); |
| |
| /** |
| * Determines if an HttpRequest can be served from the cache. |
| * |
| * @param request |
| * an HttpRequest |
| * @return boolean Is it possible to serve this request from cache |
| */ |
| public boolean isServableFromCache(final HttpRequest request) { |
| final String method = request.getMethod(); |
| |
| final ProtocolVersion pv = request.getVersion() != null ? request.getVersion() : HttpVersion.DEFAULT; |
| if (HttpVersion.HTTP_1_1.compareToVersion(pv) != 0) { |
| log.trace("non-HTTP/1.1 request was not serveable from cache"); |
| return false; |
| } |
| |
| if (!(method.equals(HeaderConstants.GET_METHOD) || method |
| .equals(HeaderConstants.HEAD_METHOD))) { |
| log.trace("non-GET or non-HEAD request was not serveable from cache"); |
| return false; |
| } |
| |
| if (request.getHeaders(HeaderConstants.PRAGMA).length > 0) { |
| log.trace("request with Pragma header was not serveable from cache"); |
| return false; |
| } |
| |
| final Iterator<HeaderElement> it = MessageSupport.iterate(request, HeaderConstants.CACHE_CONTROL); |
| while (it.hasNext()) { |
| final HeaderElement cacheControlElement = it.next(); |
| if (HeaderConstants.CACHE_CONTROL_NO_STORE.equalsIgnoreCase(cacheControlElement |
| .getName())) { |
| log.trace("Request with no-store was not serveable from cache"); |
| return false; |
| } |
| if (HeaderConstants.CACHE_CONTROL_NO_CACHE.equalsIgnoreCase(cacheControlElement |
| .getName())) { |
| log.trace("Request with no-cache was not serveable from cache"); |
| return false; |
| } |
| } |
| |
| log.trace("Request was serveable from cache"); |
| return true; |
| } |
| |
| } |