mirror of
https://github.com/yacy/yacy_search_server.git
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fed26f33a8
to support the new time parser and search functions in YaCy a high precision detection of date and time on the day is necessary. That requires that the time zone of the document content and the time zone of the user, doing a search, is detected. The time zone of the search request is done automatically using the browsers time zone offset which is delivered to the search request automatically and invisible to the user. The time zone for the content of web pages cannot be detected automatically and must be an attribute of crawl starts. The advanced crawl start now provides an input field to set the time zone in minutes as an offset number. All parsers must get a time zone offset passed, so this required the change of the parser java api. A lot of other changes had been made which corrects the wrong handling of dates in YaCy which was to add a correction based on the time zone of the server. Now no correction is added and all dates in YaCy are UTC/GMT time zone, a normalized time zone for all peers.
299 lines
12 KiB
Java
299 lines
12 KiB
Java
//
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// ProxyHandler
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// Copyright 2004 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// Copyright 2011 by Florian Richter
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// First released 2011 at http://yacy.net
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program in the file lgpl21.txt
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// If not, see <http://www.gnu.org/licenses/>.
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//
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package net.yacy.http;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.SocketException;
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import java.util.Date;
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import java.util.Enumeration;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import net.yacy.cora.date.GenericFormatter;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.protocol.Domains;
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import net.yacy.cora.protocol.HeaderFramework;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.protocol.http.HTTPClient;
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import net.yacy.document.TextParser;
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import net.yacy.crawler.data.Cache;
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import net.yacy.crawler.retrieval.Response;
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import net.yacy.server.http.HTTPDProxyHandler;
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import net.yacy.server.http.MultiOutputStream;
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import org.apache.http.Header;
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import org.apache.http.HttpResponse;
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import org.eclipse.jetty.server.Handler;
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import org.eclipse.jetty.server.Request;
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/**
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* jetty http handler
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* proxies request, caches responses and adds urls to crawler
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*/
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public class ProxyHandler extends AbstractRemoteHandler implements Handler {
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protected int timeout = 10000;
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@Override
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protected void doStart() throws Exception {
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super.doStart();
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timeout = sb.getConfigInt("proxy.clientTimeout", 10000);
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}
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public static RequestHeader convertHeaderFromJetty(HttpServletRequest request) {
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RequestHeader result = new RequestHeader();
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Enumeration<String> headerNames = request.getHeaderNames();
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while(headerNames.hasMoreElements()) {
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String headerName = headerNames.nextElement();
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Enumeration<String> headers = request.getHeaders(headerName);
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while(headers.hasMoreElements()) {
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String header = headers.nextElement();
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result.add(headerName, header);
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}
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}
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return result;
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}
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private void convertHeaderToJetty(HttpResponse in, HttpServletResponse out) {
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for(Header h: in.getAllHeaders()) {
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out.addHeader(h.getName(), h.getValue());
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}
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}
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private void cleanResponseHeader(HttpResponse headers) {
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headers.removeHeaders(HeaderFramework.CONTENT_ENCODING);
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headers.removeHeaders(HeaderFramework.CONTENT_LENGTH);
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}
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private void deleteFromCache(final byte[] hash) {
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// long size = -1;
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ResponseHeader rh = Cache.getResponseHeader(hash);
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if (rh != null) {
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// delete the cache
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// if ((size = rh.getContentLength()) == 0) {
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// byte[] b = Cache.getContent(hash);
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// if (b != null) size = b.length;
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// }
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try {
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Cache.delete(hash);
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} catch (final IOException e) {
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// log refresh miss
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HTTPDProxyHandler.proxyLog.fine(e.getMessage());
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}
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}
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}
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private void storeToCache(final Response yacyResponse, final byte[] cacheArray) {
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final Thread t = new Thread() {
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@Override
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public void run() {
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if (yacyResponse == null) return;
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this.setName("ProxyHandler.storeToCache(" + yacyResponse.url().toNormalform(true) + ")");
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// the cache does either not exist or is (supposed to be) stale
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deleteFromCache(yacyResponse.url().hash());
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if (cacheArray == null || cacheArray.length <= 0) return;
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yacyResponse.setContent(cacheArray);
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try {
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Cache.store(yacyResponse.url(), yacyResponse.getResponseHeader(), cacheArray);
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sb.toIndexer(yacyResponse);
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} catch (IOException e) {
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//log.logWarning("cannot write " + response.url() + " to Cache (1): " + e.getMessage(), e);
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}
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}
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};
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t.setPriority(Thread.MIN_PRIORITY);
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t.start();
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}
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@Override
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public void handleRemote(String target, Request baseRequest, HttpServletRequest request,
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HttpServletResponse response) throws IOException, ServletException {
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sb.proxyLastAccess = System.currentTimeMillis();
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RequestHeader proxyHeaders = convertHeaderFromJetty(request);
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setProxyHeaderForClient(request, proxyHeaders);
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final HTTPClient client = new HTTPClient(ClientIdentification.yacyProxyAgent);
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client.setTimout(timeout);
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client.setHeader(proxyHeaders.entrySet());
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client.setRedirecting(false);
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// send request
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try {
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String queryString = request.getQueryString() != null ? "?" + request.getQueryString() : "";
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DigestURL digestURI = new DigestURL(request.getScheme(), request.getServerName(), request.getServerPort(), request.getRequestURI() + queryString);
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if (request.getMethod().equals(HeaderFramework.METHOD_GET)) {
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client.GET(digestURI, false);
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} else if (request.getMethod().equals(HeaderFramework.METHOD_POST)) {
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client.POST(digestURI, request.getInputStream(), request.getContentLength(), false);
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} else if (request.getMethod().equals(HeaderFramework.METHOD_HEAD)) {
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client.HEADResponse(digestURI, false);
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} else {
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throw new ServletException("Unsupported Request Method");
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}
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HttpResponse clientresponse = client.getHttpResponse();
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int statusCode = clientresponse.getStatusLine().getStatusCode();
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final ResponseHeader responseHeaderLegacy = new ResponseHeader(statusCode, clientresponse.getAllHeaders());
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if (responseHeaderLegacy.isEmpty()) {
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throw new SocketException(clientresponse.getStatusLine().toString());
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}
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cleanResponseHeader(clientresponse);
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// reserver cache entry
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final net.yacy.crawler.retrieval.Request yacyRequest = new net.yacy.crawler.retrieval.Request(
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null,
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digestURI,
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null, //requestHeader.referer() == null ? null : new DigestURI(requestHeader.referer()).hash(),
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"",
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responseHeaderLegacy.lastModified(),
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sb.crawler.defaultProxyProfile.handle(),
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0,
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sb.crawler.defaultProxyProfile.timezoneOffset()); //sizeBeforeDelete < 0 ? 0 : sizeBeforeDelete);
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final Response yacyResponse = new Response(
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yacyRequest,
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null,
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responseHeaderLegacy,
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sb.crawler.defaultProxyProfile,
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false,
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null
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);
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final String storeError = yacyResponse.shallStoreCacheForProxy();
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final boolean storeHTCache = yacyResponse.profile().storeHTCache();
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final String supportError = TextParser.supports(yacyResponse.url(), yacyResponse.getMimeType());
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if (
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/*
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* Now we store the response into the htcache directory if
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* a) the response is cacheable AND
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*/
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(storeError == null) &&
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/*
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* b) the user has configured to use the htcache OR
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* c) the content should be indexed
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*/
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((storeHTCache) || (supportError != null))
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) {
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// we don't write actually into a file, only to RAM, and schedule writing the file.
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int l = responseHeaderLegacy.size();
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final ByteArrayOutputStream byteStream = new ByteArrayOutputStream((l < 32) ? 32 : l);
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final OutputStream toClientAndMemory = new MultiOutputStream(new OutputStream[] {response.getOutputStream(), byteStream});
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convertHeaderToJetty(clientresponse, response);
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response.setStatus(statusCode);
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client.writeTo(toClientAndMemory);
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// cached bytes
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storeToCache(yacyResponse, byteStream.toByteArray());
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} else {
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// no caching
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/*if (log.isFine()) log.logFine(reqID +" "+ url.toString() + " not cached." +
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" StoreError=" + ((storeError==null)?"None":storeError) +
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" StoreHTCache=" + storeHTCache +
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" SupportError=" + supportError);*/
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convertHeaderToJetty(clientresponse, response);
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response.setStatus(statusCode);
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if (statusCode == HttpServletResponse.SC_OK) { // continue to serve header to client e.g. HttpStatus = 302 (while skiping content)
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client.writeTo(response.getOutputStream()); // may throw exception on httpStatus=302 while gzip encoded inputstream
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}
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}
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} catch (final SocketException se) {
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throw new ServletException("Socket Exception: " + se.getMessage());
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} finally {
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client.finish();
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}
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// we handled this request, break out of handler chain
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logProxyAccess(request);
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baseRequest.setHandled(true);
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}
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/**
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* adds specific header elements for the connection of the internal
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* httpclient to the remote server according to local config
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*
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* @param header header for http client (already preset with headers from
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* original ServletRequest)
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* @param origServletRequest original request/header
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*/
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private void setProxyHeaderForClient(final HttpServletRequest origServletRequest, final HeaderFramework header) {
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header.remove(RequestHeader.KEEP_ALIVE);
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header.remove(HeaderFramework.CONTENT_LENGTH);
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// setting the X-Forwarded-For header
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if (sb.getConfigBool("proxy.sendXForwardedForHeader", true)) {
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String ip = origServletRequest.getRemoteAddr();
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if (!Domains.isThisHostIP(ip)) { // if originator is local host no user ip to forward (= request from localhost)
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header.put(HeaderFramework.X_FORWARDED_FOR, origServletRequest.getRemoteAddr());
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}
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}
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String httpVersion = origServletRequest.getProtocol();
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HTTPDProxyHandler.modifyProxyHeaders(header, httpVersion);
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}
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public final static synchronized void logProxyAccess(HttpServletRequest request) {
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final StringBuilder logMessage = new StringBuilder(80);
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// Timestamp
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logMessage.append(GenericFormatter.SHORT_SECOND_FORMATTER.format(new Date()));
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logMessage.append(' ');
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// Remote Host
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final String clientIP = request.getRemoteAddr();
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logMessage.append(clientIP);
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logMessage.append(' ');
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// Method
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final String requestMethod = request.getMethod();
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logMessage.append(requestMethod);
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logMessage.append(' ');
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// URL
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logMessage.append(request.getRequestURL());
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final String requestArgs = request.getQueryString();
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if (requestArgs != null) {
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logMessage.append("?").append(requestArgs);
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}
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HTTPDProxyHandler.proxyLog.fine(logMessage.toString());
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}
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}
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