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/**
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* Copyright 2006 OCLC Online Computer Library Center Licensed under the Apache
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* License, Version 2.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or
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* agreed to in writing, software distributed under the License is distributed on
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* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package edu.ucsb.nceas.metacat.oaipmh.provider.server;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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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 java.util.HashMap;
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import java.util.Properties;
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import java.util.zip.DeflaterOutputStream;
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import java.util.zip.GZIPOutputStream;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.stream.StreamSource;
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import org.apache.log4j.Logger;
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import org.apache.log4j.PropertyConfigurator;
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import edu.ucsb.nceas.metacat.oaipmh.provider.server.crosswalk.Eml2oai_dc;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import ORG.oclc.oai.server.catalog.AbstractCatalog;
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import ORG.oclc.oai.server.verb.BadVerb;
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import ORG.oclc.oai.server.verb.GetRecord;
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import ORG.oclc.oai.server.verb.Identify;
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import ORG.oclc.oai.server.verb.ListIdentifiers;
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import ORG.oclc.oai.server.verb.ListMetadataFormats;
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import ORG.oclc.oai.server.verb.ListRecords;
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import ORG.oclc.oai.server.verb.ListSets;
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import ORG.oclc.oai.server.verb.OAIInternalServerError;
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import ORG.oclc.oai.server.verb.ServerVerb;
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/**
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* OAIHandler is the primary Servlet for OAICat.
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*
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* @author Jeffrey A. Young, OCLC Online Computer Library Center
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*/
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public class OAIHandler extends HttpServlet {
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/*
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* Class fields
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*/
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private static final Logger log = Logger.getLogger(OAIHandler.class);
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private static final long serialVersionUID = 1L;
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private static final String VERSION = "1.5.57";
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private static boolean debug = false;
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// Set to false when developing and testing code outside of Metacat
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private static boolean integratedWithMetacat = true;
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/*
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* Class methods
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*/
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/**
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* Get the VERSION number
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*/
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public static String getVERSION() {
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return VERSION;
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}
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/**
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* Boolean to determine whether the Data Provider code is executing in a
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* Metacat application. This is normally true, but the
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* 'integratedWithMetacat' value can be set to
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* false by a developer when testing the code outside of Metacat. This
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* eliminates dependencies on Metacat property settings.
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*
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* @return
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*/
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public static boolean isIntegratedWithMetacat() {
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return integratedWithMetacat;
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}
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/*
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* Instance fields
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*/
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protected HashMap attributesMap = new HashMap();
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private final String CONFIG_DIR = "WEB-INF";
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private final String CONFIG_NAME = "metacat.properties";
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private final String LOG4J_NAME = "log4j.properties";
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private final String XSLT_DIR = "oaipmh";
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/*
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* Instance methods
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*/
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/**
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* Peform the http GET action. Note that POST is shunted to here as well. The
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* verb widget is taken from the request and used to invoke an OAIVerb object
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* of the corresponding kind to do the actual work of the verb.
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*
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* @param request
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* the servlet's request information
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* @param response
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* the servlet's response information
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* @exception IOException
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* an I/O error occurred
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*/
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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ServletConfig servletConfig = this.getServletConfig();
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//init_debug(servletConfig); // used when debugging the init() method
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String pathInfo = request.getPathInfo();
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HashMap attributes = getAttributes(pathInfo);
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Properties properties;
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if (!filterRequest(request, response)) { return; }
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log.debug("attributes=" + attributes);
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properties = (Properties) attributes.get("OAIHandler.properties");
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boolean monitor = false;
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if (properties.getProperty("OAIHandler.monitor") != null) {
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monitor = true;
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}
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boolean serviceUnavailable = isServiceUnavailable(properties);
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HashMap serverVerbs = ServerVerb.getVerbs(properties);
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Transformer transformer =
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(Transformer) attributes.get("OAIHandler.transformer");
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boolean forceRender = false;
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if ("true".equals(properties.getProperty("OAIHandler.forceRender"))) {
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forceRender = true;
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}
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// try {
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request.setCharacterEncoding("UTF-8");
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// } catch (UnsupportedEncodingException e) {
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// e.printStackTrace();
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// throw new IOException(e.getMessage());
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// }
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Date then = null;
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if (monitor) then = new Date();
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if (debug) {
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Enumeration headerNames = request.getHeaderNames();
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System.out.println("OAIHandler.doGet: ");
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while (headerNames.hasMoreElements()) {
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String headerName = (String) headerNames.nextElement();
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System.out.print(headerName);
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System.out.print(": ");
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System.out.println(request.getHeader(headerName));
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}
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}
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if (serviceUnavailable) {
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response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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"Sorry. This server is down for maintenance");
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}
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else {
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try {
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String userAgent = request.getHeader("User-Agent");
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if (userAgent == null) {
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userAgent = "";
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} else {
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userAgent = userAgent.toLowerCase();
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}
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Transformer serverTransformer = null;
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if (transformer != null) {
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// return HTML if the client is an old browser
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if (forceRender
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|| userAgent.indexOf("opera") != -1
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|| (userAgent.startsWith("mozilla") && userAgent
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.indexOf("msie 6") == -1
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/* && userAgent.indexOf("netscape/7") == -1 */)) {
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serverTransformer = transformer;
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}
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}
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String result = getResult(attributes, request, response,
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serverTransformer, serverVerbs);
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// log.debug("result=" + result);
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// if (serverTransformer) { // render on the server
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// response.setContentType("text/html; charset=UTF-8");
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// StringReader stringReader = new StringReader(getResult(request));
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// StreamSource streamSource = new StreamSource(stringReader);
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// StringWriter stringWriter = new StringWriter();
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// transformer.transform(streamSource, new StreamResult(stringWriter));
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// result = stringWriter.toString();
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// } else { // render on the client
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// response.setContentType("text/xml; charset=UTF-8");
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// result = getResult(request);
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// }
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Writer out = getWriter(request, response);
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out.write(result);
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out.close();
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}
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catch (FileNotFoundException e) {
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if (debug) {
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e.printStackTrace();
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System.out.println("SC_NOT_FOUND: " + e.getMessage());
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}
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response.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage());
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}
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catch (TransformerException e) {
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response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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e.getMessage()
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);
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}
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catch (OAIInternalServerError e) {
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response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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e.getMessage()
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);
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}
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catch (SocketException e) {
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System.out.println(e.getMessage());
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response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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e.getMessage()
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);
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}
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catch (Throwable e) {
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e.printStackTrace();
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response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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e.getMessage()
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);
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}
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}
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if (monitor) {
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StringBuffer reqUri = new StringBuffer(request.getRequestURI().toString());
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String queryString = request.getQueryString(); // d=789
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if (queryString != null) {
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reqUri.append("?").append(queryString);
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}
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Runtime rt = Runtime.getRuntime();
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System.out.println(rt.freeMemory() + "/" + rt.totalMemory() + " "
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+ ((new Date()).getTime() - then.getTime()) + "ms: "
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+ reqUri.toString());
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}
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}
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/**
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* Perform a POST action. Actually this gets shunted to GET.
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*
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* @param request
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* the servlet's request information
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* @param response
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* the servlet's response information
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* @exception IOException
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* an I/O error occurred
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*/
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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doGet(request, response);
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}
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291
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/**
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* Override to do any pre-qualification; return false if the response should be
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* returned immediately, without further action.
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*
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* @param request
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297
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* @param response
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* @return false=return immediately, true=continue
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*/
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300
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protected boolean filterRequest(HttpServletRequest request,
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HttpServletResponse response) {
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return true;
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}
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304
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|
305
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306
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public HashMap getAttributes(Properties properties)
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307
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throws Throwable {
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308
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HashMap attributes = new HashMap();
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309
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Enumeration attrNames = getServletContext().getAttributeNames();
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String serviceUnavailable;
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312
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while (attrNames.hasMoreElements()) {
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String attrName = (String) attrNames.nextElement();
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Object attrValue = getServletContext().getAttribute(attrName);
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attributes.put(attrName, attrValue);
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}
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318
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attributes.put("OAIHandler.properties", properties);
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String missingVerbClassName = properties.getProperty(
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"OAIHandler.missingVerbClassName", "ORG.oclc.oai.server.verb.BadVerb");
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Class missingVerbClass = Class.forName(missingVerbClassName);
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attributes.put("OAIHandler.missingVerbClass", missingVerbClass);
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324
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serviceUnavailable = properties.getProperty("OAIHandler.serviceUnavailable");
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if (!"true".equals(serviceUnavailable)) {
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attributes.put("OAIHandler.version", VERSION);
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AbstractCatalog metacatCatalog =
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AbstractCatalog.factory(properties, getServletContext());
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attributes.put("OAIHandler.catalog", metacatCatalog);
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}
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331
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332
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boolean forceRender = false;
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333
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if ("true".equals(properties.getProperty("OAIHandler.forceRender"))) {
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334
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forceRender = true;
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335
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}
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336
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337
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String styleSheet = properties.getProperty("OAIHandler.styleSheet");
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338
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String appBase = properties.getProperty("OAIHandler.appBase");
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339
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340
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if (appBase == null) appBase = "webapps";
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341
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342
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String render = properties.getProperty("OAIHandler.renderForOldBrowsers");
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343
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if ((styleSheet != null) &&
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344
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("true".equalsIgnoreCase(render) || forceRender)
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345
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) {
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346
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InputStream is;
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347
|
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348
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try {
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349
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is = new FileInputStream(appBase + "/" + styleSheet);
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350
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}
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351
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catch (FileNotFoundException e) {
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352
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// This is a silly way to skip the context name in the styleSheet name
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353
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is = new FileInputStream(getServletContext().getRealPath(
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354
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styleSheet.substring(styleSheet.indexOf("/", 1) + 1)));
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355
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}
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356
|
|
357
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StreamSource xslSource = new StreamSource(is);
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358
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TransformerFactory tFactory = TransformerFactory.newInstance();
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359
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Transformer transformer = tFactory.newTransformer(xslSource);
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360
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attributes.put("OAIHandler.transformer", transformer);
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361
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}
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362
|
|
363
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return attributes;
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364
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}
|
365
|
|
366
|
|
367
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public HashMap getAttributes(String pathInfo) {
|
368
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HashMap attributes = null;
|
369
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log.debug("pathInfo=" + pathInfo);
|
370
|
|
371
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if (pathInfo != null && pathInfo.length() > 0) {
|
372
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if (attributesMap.containsKey(pathInfo)) {
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373
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log.debug("attributesMap containsKey");
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374
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attributes = (HashMap) attributesMap.get(pathInfo);
|
375
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}
|
376
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else {
|
377
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log.debug("!attributesMap containsKey");
|
378
|
|
379
|
try {
|
380
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String fileName = pathInfo.substring(1) + ".properties";
|
381
|
log.debug("attempting load of " + fileName);
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382
|
Thread thread = Thread.currentThread();
|
383
|
ClassLoader classLoader = thread.getContextClassLoader();
|
384
|
InputStream in = classLoader.getResourceAsStream(fileName);
|
385
|
|
386
|
if (in != null) {
|
387
|
log.debug("file found");
|
388
|
Properties properties = new Properties();
|
389
|
properties.load(in);
|
390
|
attributes = getAttributes(properties);
|
391
|
}
|
392
|
else {
|
393
|
log.debug("file not found");
|
394
|
}
|
395
|
|
396
|
attributesMap.put(pathInfo, attributes);
|
397
|
}
|
398
|
catch (Throwable e) {
|
399
|
log.debug("Couldn't load file", e);
|
400
|
// do nothing
|
401
|
}
|
402
|
}
|
403
|
}
|
404
|
|
405
|
if (attributes == null) log.debug("use global attributes");
|
406
|
attributes = (HashMap) attributesMap.get("global");
|
407
|
|
408
|
return attributes;
|
409
|
}
|
410
|
|
411
|
|
412
|
public static String getResult(HashMap attributes,
|
413
|
HttpServletRequest request,
|
414
|
HttpServletResponse response,
|
415
|
Transformer serverTransformer,
|
416
|
HashMap serverVerbs
|
417
|
)
|
418
|
throws Throwable {
|
419
|
String verb = request.getParameter("verb");
|
420
|
log.debug("verb: " + verb);
|
421
|
String result = null;
|
422
|
|
423
|
if (verb != null) {
|
424
|
if (verb.equals("GetRecord")) {
|
425
|
result = GetRecord.construct(attributes, request, response,
|
426
|
serverTransformer);
|
427
|
}
|
428
|
else if (verb.equals("Identify")) {
|
429
|
result = Identify.construct(attributes, request, response,
|
430
|
serverTransformer);
|
431
|
}
|
432
|
else if (verb.equals("ListIdentifiers")) {
|
433
|
result = ListIdentifiers.construct(attributes, request, response,
|
434
|
serverTransformer);
|
435
|
}
|
436
|
else if (verb.equals("ListMetadataFormats")) {
|
437
|
result = ListMetadataFormats.construct(attributes, request, response,
|
438
|
serverTransformer);
|
439
|
}
|
440
|
else if (verb.equals("ListRecords")) {
|
441
|
result = ListRecords.construct(attributes, request, response,
|
442
|
serverTransformer);
|
443
|
}
|
444
|
else if (verb.equals("ListSets")) {
|
445
|
result = ListSets.construct(attributes, request, response,
|
446
|
serverTransformer);
|
447
|
}
|
448
|
else {
|
449
|
result = BadVerb.construct(attributes, request, response,
|
450
|
serverTransformer);
|
451
|
}
|
452
|
}
|
453
|
else {
|
454
|
// Return a 'badVerb' response when the verb is missing from the request
|
455
|
result = BadVerb.construct(attributes, request, response,
|
456
|
serverTransformer);
|
457
|
}
|
458
|
|
459
|
return result;
|
460
|
|
461
|
/*
|
462
|
* } catch (NoSuchMethodException e) { throw new
|
463
|
* OAIInternalServerError(e.getMessage()); } catch (IllegalAccessException
|
464
|
* e) { throw new OAIInternalServerError(e.getMessage()); }
|
465
|
*/
|
466
|
}
|
467
|
|
468
|
|
469
|
/**
|
470
|
* Get a response Writer depending on acceptable encodings
|
471
|
*
|
472
|
* @param request
|
473
|
* the servlet's request information
|
474
|
* @param response
|
475
|
* the servlet's response information
|
476
|
* @exception IOException
|
477
|
* an I/O error occurred
|
478
|
*/
|
479
|
public static Writer getWriter(HttpServletRequest request,
|
480
|
HttpServletResponse response) throws IOException {
|
481
|
Writer out;
|
482
|
String encodings = request.getHeader("Accept-Encoding");
|
483
|
|
484
|
if (debug) { System.out.println("encodings=" + encodings); }
|
485
|
|
486
|
if (encodings != null && encodings.indexOf("gzip") != -1) {
|
487
|
// System.out.println("using gzip encoding");
|
488
|
// log.debug("using gzip encoding");
|
489
|
response.setHeader("Content-Encoding", "gzip");
|
490
|
out = new OutputStreamWriter(new GZIPOutputStream(response
|
491
|
.getOutputStream()), "UTF-8");
|
492
|
// } else if (encodings != null && encodings.indexOf("compress") != -1) {
|
493
|
// // System.out.println("using compress encoding");
|
494
|
// response.setHeader("Content-Encoding", "compress");
|
495
|
// ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
|
496
|
// zos.putNextEntry(new ZipEntry("dummy name"));
|
497
|
// out = new OutputStreamWriter(zos, "UTF-8");
|
498
|
}
|
499
|
else if (encodings != null && encodings.indexOf("deflate") != -1) {
|
500
|
// System.out.println("using deflate encoding");
|
501
|
// log.debug("using deflate encoding");
|
502
|
response.setHeader("Content-Encoding", "deflate");
|
503
|
out = new OutputStreamWriter(new DeflaterOutputStream(response
|
504
|
.getOutputStream()), "UTF-8");
|
505
|
}
|
506
|
else {
|
507
|
// log.debug("using no encoding");
|
508
|
out = response.getWriter();
|
509
|
}
|
510
|
|
511
|
return out;
|
512
|
}
|
513
|
|
514
|
|
515
|
/**
|
516
|
* init is called one time when the Servlet is loaded. This is the place where
|
517
|
* one-time initialization is done. Specifically, we load the properties file
|
518
|
* for this application, and create the AbstractCatalog object for subsequent
|
519
|
* use.
|
520
|
*
|
521
|
* @param config
|
522
|
* servlet configuration information
|
523
|
* @exception ServletException
|
524
|
* there was a problem with initialization
|
525
|
*/
|
526
|
//public void init_debug(ServletConfig config) throws ServletException {
|
527
|
public void init(ServletConfig config) throws ServletException {
|
528
|
super.init(config);
|
529
|
|
530
|
if (isIntegratedWithMetacat()) {
|
531
|
try {
|
532
|
PropertyService.getInstance();
|
533
|
}
|
534
|
catch (ServiceException se) {
|
535
|
System.err.println("Error in loading properties: " + se.getMessage());
|
536
|
}
|
537
|
}
|
538
|
|
539
|
ServletContext servletContext = config.getServletContext();
|
540
|
String configDirPath = servletContext.getRealPath(CONFIG_DIR);
|
541
|
String configPath = configDirPath + "/" + CONFIG_NAME;
|
542
|
|
543
|
// Initialize the properties file for log4j
|
544
|
String log4jPath = configDirPath + "/" + LOG4J_NAME;
|
545
|
PropertyConfigurator.configureAndWatch(log4jPath);
|
546
|
|
547
|
// Initialize the directory path to the crosswalk XSLT files
|
548
|
String xsltDirPath = servletContext.getRealPath(XSLT_DIR);
|
549
|
Eml2oai_dc.setDirPath(xsltDirPath);
|
550
|
|
551
|
try {
|
552
|
HashMap attributes = null;
|
553
|
Properties properties = null;
|
554
|
InputStream in;
|
555
|
|
556
|
try {
|
557
|
log.debug("configPath=" + configPath);
|
558
|
in = new FileInputStream(configPath);
|
559
|
}
|
560
|
catch (FileNotFoundException e) {
|
561
|
log.debug("configPath not found. Try the classpath: " + configPath);
|
562
|
Thread thread = Thread.currentThread();
|
563
|
ClassLoader classLoader = thread.getContextClassLoader();
|
564
|
in = classLoader.getResourceAsStream(configPath);
|
565
|
}
|
566
|
|
567
|
if (in != null) {
|
568
|
log.debug("configPath '" + configPath + "' found. Loading properties");
|
569
|
properties = new Properties();
|
570
|
properties.load(in);
|
571
|
attributes = getAttributes(properties);
|
572
|
}
|
573
|
|
574
|
attributesMap.put("global", attributes);
|
575
|
}
|
576
|
catch (FileNotFoundException e) {
|
577
|
e.printStackTrace();
|
578
|
throw new ServletException(e.getMessage());
|
579
|
}
|
580
|
catch (ClassNotFoundException e) {
|
581
|
e.printStackTrace();
|
582
|
throw new ServletException(e.getMessage());
|
583
|
}
|
584
|
catch (IllegalArgumentException e) {
|
585
|
e.printStackTrace();
|
586
|
throw new ServletException(e.getMessage());
|
587
|
}
|
588
|
catch (IOException e) {
|
589
|
e.printStackTrace();
|
590
|
throw new ServletException(e.getMessage());
|
591
|
}
|
592
|
catch (Throwable e) {
|
593
|
e.printStackTrace();
|
594
|
throw new ServletException(e.getMessage());
|
595
|
}
|
596
|
}
|
597
|
|
598
|
|
599
|
/**
|
600
|
* Should the server report itself down for maintenance? Override this method
|
601
|
* if you want to do this check another way.
|
602
|
*
|
603
|
* @param properties
|
604
|
* @return true=service is unavailable, false=service is available
|
605
|
*/
|
606
|
protected boolean isServiceUnavailable(Properties properties) {
|
607
|
if (properties.getProperty("OAIHandler.serviceUnavailable") != null) {
|
608
|
return true;
|
609
|
}
|
610
|
|
611
|
return false;
|
612
|
}
|
613
|
|
614
|
}
|