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https://github.com/Alfresco/alfresco-community-repo.git
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7fd19e7e88
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5186 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
344 lines
12 KiB
Java
344 lines
12 KiB
Java
/*
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* Copyright (C) 2005-2007 Alfresco Software Limited.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* As a special exception to the terms and conditions of version 2.0 of
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* the GPL, you may redistribute this Program in connection with Free/Libre
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* and Open Source Software ("FLOSS") applications as described in Alfresco's
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* FLOSS exception. You should have recieved a copy of the text describing
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* the FLOSS exception, and it is also available here:
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* http://www.alfresco.com/legal/licensing"
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*/
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package org.alfresco.web.api.services;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.MalformedURLException;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import javax.servlet.http.HttpServletResponse;
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import org.alfresco.config.Config;
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import org.alfresco.config.ConfigService;
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import org.alfresco.repo.content.MimetypeMap;
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import org.alfresco.web.api.APIException;
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import org.alfresco.web.api.APIRequest;
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import org.alfresco.web.api.APIResponse;
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import org.alfresco.web.api.FormatRegistry;
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import org.alfresco.web.api.APIRequest.HttpMethod;
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import org.alfresco.web.api.APIRequest.RequiredAuthentication;
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import org.alfresco.web.app.servlet.HTTPProxy;
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import org.alfresco.web.config.OpenSearchConfigElement;
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import org.alfresco.web.config.OpenSearchConfigElement.EngineConfig;
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import org.alfresco.web.config.OpenSearchConfigElement.ProxyConfig;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.dom4j.Attribute;
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import org.dom4j.Document;
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import org.dom4j.DocumentException;
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import org.dom4j.Element;
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import org.dom4j.XPath;
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import org.dom4j.io.OutputFormat;
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import org.dom4j.io.SAXReader;
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import org.dom4j.io.XMLWriter;
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import org.springframework.beans.factory.InitializingBean;
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/**
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* Alfresco OpenSearch Proxy Service
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*
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* Provides the ability to submit a request to a registered search engine
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* via the Alfresco server.
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*
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* @author davidc
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*/
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public class SearchProxy extends APIServiceImpl implements InitializingBean
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{
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// Logger
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private static final Log logger = LogFactory.getLog(SearchProxy.class);
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// dependencies
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protected FormatRegistry formatRegistry;
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protected ConfigService configService;
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protected OpenSearchConfigElement searchConfig;
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protected String proxyPath;
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/**
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* @param formatRegistry
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*/
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public void setFormatRegistry(FormatRegistry formatRegistry)
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{
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this.formatRegistry = formatRegistry;
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}
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/**
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* @param configService
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*/
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public void setConfigService(ConfigService configService)
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{
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this.configService = configService;
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}
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/* (non-Javadoc)
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* @see org.alfresco.web.api.APIService#getRequiredAuthentication()
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*/
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public RequiredAuthentication getRequiredAuthentication()
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{
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return APIRequest.RequiredAuthentication.None;
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}
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/* (non-Javadoc)
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* @see org.alfresco.web.api.APIService#getHttpMethod()
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*/
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public HttpMethod getHttpMethod()
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{
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return APIRequest.HttpMethod.GET;
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}
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/* (non-Javadoc)
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* @see org.alfresco.web.api.APIService#getDefaultFormat()
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*/
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public String getDefaultFormat()
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{
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return null;
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}
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/* (non-Javadoc)
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* @see org.alfresco.web.api.APIService#getDescription()
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*/
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public String getDescription()
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{
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return "Issue an OpenSearch query via Alfresco";
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}
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/* (non-Javadoc)
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* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
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*/
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public void afterPropertiesSet() throws Exception
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{
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Config config = configService.getConfig("OpenSearch");
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searchConfig = (OpenSearchConfigElement)config.getConfigElement(OpenSearchConfigElement.CONFIG_ELEMENT_ID);
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if (searchConfig == null)
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{
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throw new APIException("OpenSearch configuration not found");
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}
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ProxyConfig proxyConfig = searchConfig.getProxy();
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if (proxyConfig == null)
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{
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throw new APIException("OpenSearch proxy configuration not found");
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}
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proxyPath = proxyConfig.getUrl();
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}
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/* (non-Javadoc)
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* @see org.alfresco.web.api.APIService#execute(org.alfresco.web.api.APIRequest, org.alfresco.web.api.APIResponse)
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*/
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public void execute(APIRequest req, APIResponse res)
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throws IOException
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{
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String extensionPath = req.getExtensionPath(this);
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String[] extensionPaths = extensionPath.split("/");
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if (extensionPaths.length != 2)
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{
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throw new APIException("OpenSearch engine has not been specified as /<engine>/<format>");
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}
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// retrieve search engine configuration
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String engine = extensionPaths[0];
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EngineConfig engineConfig = searchConfig.getEngine(engine);
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if (engineConfig == null)
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{
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throw new APIException("OpenSearch engine '" + engine + "' does not exist");
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}
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// retrieve engine url as specified by format
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String format = extensionPaths[1];
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String mimetype = formatRegistry.getMimeType(null, format);
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if (mimetype == null)
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{
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throw new APIException("Format '" + format + "' does not map to a registered mimetype");
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}
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Map<String, String> engineUrls = engineConfig.getUrls();
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String engineUrl = engineUrls.get(mimetype);
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if (engineUrl == null)
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{
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throw new APIException("Url mimetype '" + mimetype + "' does not exist for engine '" + engine + "'");
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}
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// replace template url arguments with actual arguments specified on request
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int engineUrlArgIdx = engineUrl.indexOf("?");
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if (engineUrlArgIdx != -1)
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{
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engineUrl = engineUrl.substring(0, engineUrlArgIdx);
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}
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if (req.getQueryString() != null)
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{
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engineUrl += "?" + req.getQueryString();
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}
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if (logger.isDebugEnabled())
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logger.debug("Mapping engine '" + engine + "' (mimetype '" + mimetype + "') to url '" + engineUrl + "'");
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// issue request against search engine
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SearchEngineHttpProxy proxy = new SearchEngineHttpProxy(req.getPath(), engine, engineUrl, res);
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proxy.service();
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}
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/**
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* OpenSearch HTTPProxy
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*
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* This proxy remaps OpenSearch links (e.g. previous, next) found in search results.
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*
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* @author davidc
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*/
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private class SearchEngineHttpProxy extends HTTPProxy
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{
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private final static String ATOM_NS_URI = "http://www.w3.org/2005/Atom";
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private final static String ATOM_NS_PREFIX = "atom";
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private final static String ATOM_LINK_XPATH = "atom:link[@rel=\"first\" or @rel=\"last\" or @rel=\"next\" or @rel=\"previous\" or @rel=\"self\" or @rel=\"alternate\"]";
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private String engine;
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private String rootPath;
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/**
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* Construct
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*
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* @param requestUrl
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* @param response
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* @throws MalformedURLException
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*/
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public SearchEngineHttpProxy(String rootPath, String engine, String engineUrl, HttpServletResponse response)
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throws MalformedURLException
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{
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super(engineUrl.startsWith("/") ? rootPath + engineUrl : engineUrl, response);
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this.engine = engine;
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this.rootPath = rootPath;
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}
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/* (non-Javadoc)
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* @see org.alfresco.web.app.servlet.HTTPProxy#writeResponse(java.io.InputStream, java.io.OutputStream)
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*/
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@Override
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protected void writeResponse(InputStream input, OutputStream output)
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throws IOException
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{
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if (response.getContentType().startsWith(MimetypeMap.MIMETYPE_ATOM) ||
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response.getContentType().startsWith(MimetypeMap.MIMETYPE_RSS))
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{
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// Only post-process ATOM and RSS feeds
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// Replace all navigation links with "proxied" versions
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SAXReader reader = new SAXReader();
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try
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{
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Document document = reader.read(input);
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Element rootElement = document.getRootElement();
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XPath xpath = rootElement.createXPath(ATOM_LINK_XPATH);
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Map<String,String> uris = new HashMap<String,String>();
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uris.put(ATOM_NS_PREFIX, ATOM_NS_URI);
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xpath.setNamespaceURIs(uris);
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List nodes = xpath.selectNodes(rootElement);
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Iterator iter = nodes.iterator();
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while (iter.hasNext())
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{
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Element element = (Element)iter.next();
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Attribute hrefAttr = element.attribute("href");
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String mimetype = element.attributeValue("type");
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if (mimetype == null || mimetype.length() == 0)
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{
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mimetype = MimetypeMap.MIMETYPE_HTML;
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}
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String url = createUrl(engine, hrefAttr.getValue(), mimetype);
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if (url.startsWith("/"))
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{
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url = rootPath + url;
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}
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hrefAttr.setValue(url);
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}
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OutputFormat outputFormat = OutputFormat.createPrettyPrint();
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XMLWriter writer = new XMLWriter(output, outputFormat);
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writer.write(rootElement);
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writer.flush();
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}
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catch(DocumentException e)
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{
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throw new IOException(e.toString());
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}
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}
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else
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{
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super.writeResponse(input, output);
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}
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}
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}
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/**
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* Construct a "proxied" search engine url
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*
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* @param engine engine name (as identified by <engine proxy="<name>">)
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* @param mimetype url to proxy (as identified by mimetype)
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* @return "proxied" url
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*/
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public String createUrl(OpenSearchConfigElement.EngineConfig engine, String mimetype)
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{
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Map<String, String> urls = engine.getUrls();
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String url = urls.get(mimetype);
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if (url != null)
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{
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String proxy = engine.getProxy();
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if (proxy != null && !mimetype.equals(MimetypeMap.MIMETYPE_OPENSEARCH_DESCRIPTION))
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{
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url = createUrl(proxy, url, mimetype);
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}
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}
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return url;
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}
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/**
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* Construct a "proxied" search engine url
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*
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* @param engine engine name (as identified by <engine proxy="<name>">)
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* @param url engine url
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* @param mimetype mimetype of url
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* @return "proxied" url
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*/
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public String createUrl(String engine, String url, String mimetype)
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{
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String format = formatRegistry.getFormat(null, mimetype);
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if (format == null)
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{
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throw new APIException("Mimetype '" + mimetype + "' is not registered.");
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}
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String proxyUrl = null;
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int argIdx = url.indexOf("?");
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if (argIdx == -1)
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{
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proxyUrl = proxyPath + "/" + engine + "/" + format;
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}
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else
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{
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proxyUrl = proxyPath + "/" + engine + "/" + format + url.substring(argIdx);
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}
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return proxyUrl;
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}
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} |