353 lines
12 KiB
Java
353 lines
12 KiB
Java
/**
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*
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*/
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package org.gcube.datatransfer.resolver.gis.geonetwork;
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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.io.StringReader;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Timer;
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import java.util.TimerTask;
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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 org.apache.commons.io.IOUtils;
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import org.gcube.datatransfer.resolver.gis.GeoRuntimeReader;
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import org.gcube.datatransfer.resolver.gis.GeoRuntimeReader.GEO_SERVICE;
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import org.gcube.datatransfer.resolver.gis.GeonetowrkAccessParameter;
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import org.gcube.datatransfer.resolver.gis.GeonetworkServiceInterface;
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import org.gcube.datatransfer.resolver.gis.MetadataConverter;
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import org.gcube.datatransfer.resolver.gis.entity.ServerParameters;
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import org.gcube.datatransfer.resolver.gis.exception.GeonetworkInstanceException;
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import org.gcube.datatransfer.resolver.gis.exception.IllegalArgumentException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* The Class GeonetworkResolver.
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*
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* @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
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* Apr 4, 2016
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*
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* This class authenticate all query on Geonetwork
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*/
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public class GeonetworkResolver extends HttpServlet{
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/**
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*
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*/
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public static final String APPLICATION_XML = "application/xml";
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/**
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*
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*/
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private static final long serialVersionUID = -61097584153314181L;
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public static final String SCOPE = "scope";
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public static final String RESET_CACHE = "resetcache";
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public static final String RESET_CACHED_SCOPE = "resetcachedscope";
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public static final String CSW_SERVER = "srv/en/csw";
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/** The logger. */
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private static final Logger logger = LoggerFactory.getLogger(GeonetworkResolver.class);
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protected Map<String, ServerParameters> cacheGNServerParams; //A cache: scope - geonetwork parameters
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private Timer timer;
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//THIRTY MINUTES
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public static final long CACHE_RESET_TIME = 30*60*1000;
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//TEN MINUTES
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public static final long CACHE_RESET_DELAY = 10*1000;
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/* (non-Javadoc)
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* @see javax.servlet.GenericServlet#init()
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*/
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@Override
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public void init() throws ServletException {
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super.init();
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timer = new Timer(true);
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timer.schedule(new TimerTask() {
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@Override
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public void run() {
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logger.info("Resetting Geonetwork configuratios cache...");
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resetCacheServerParameters();
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}
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}, CACHE_RESET_DELAY, CACHE_RESET_TIME);
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}
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/* (non-Javadoc)
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* @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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*/
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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String scope = req.getParameter(SCOPE);
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String resetCache = req.getParameter(RESET_CACHE);
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String resetScope = req.getParameter(RESET_CACHED_SCOPE);
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if (scope == null || scope.equals("")) {
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logger.debug("Scope not found");
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sendError(resp, HttpServletResponse.SC_BAD_REQUEST, SCOPE+" not found or empty");
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return;
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}
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if(resetCache!=null && Boolean.parseBoolean(resetCache)){
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resetCacheServerParameters();
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}
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if(resetScope!=null && Boolean.parseBoolean(resetScope)){
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resetCacheServerParameterForScope(resetScope);
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}
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logger.info("SCOPE: " + scope +", Query String: " + req.getQueryString());
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try {
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ServerParameters geonetworkParams = getGeonetworkCachedServerParameters(scope);
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HTTPCallsUtils httpUtils = new HTTPCallsUtils();
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boolean authorized = GNAuthentication.login(httpUtils, geonetworkParams.getUrl(), geonetworkParams.getUser(), geonetworkParams.getPassword());
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logger.trace("Authorized on "+geonetworkParams +" ? "+authorized);
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String newQueryString = purgeScopeFromQueryString(scope, req.getQueryString());
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logger.info("Purged query string: "+newQueryString);
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String gnGetlURL = newQueryString==null || newQueryString.isEmpty()? geonetworkParams.getUrl()+"/"+CSW_SERVER : geonetworkParams.getUrl()+"/"+CSW_SERVER+"?"+newQueryString;
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logger.info("Sending get request to URL: "+gnGetlURL);
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String response = httpUtils.get(gnGetlURL);
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logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
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resp.setContentType(httpUtils.getLastContentType());
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InputStream in = IOUtils.toInputStream(response);
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OutputStream out = resp.getOutputStream();
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try{
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int bytes = IOUtils.copy(in, out);
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if(bytes==0)
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logger.warn("ResponseBody is empty, returning empty resp");
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}catch(Exception e){
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logger.error("Error on copy response:", e);
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}finally{
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IOUtils.closeQuietly(in);
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}
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} catch (IllegalArgumentException e){
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logger.error("IllegalArgumentException:", e);
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sendError(resp, HttpServletResponse.SC_BAD_REQUEST, "Illegal argument to carry out the request!");
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return;
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} catch (Exception e) {
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logger.error("Exception:", e);
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String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
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sendError(resp, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
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return;
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}
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}
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/**
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* Purge scope from query string.
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*
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* @param scope the scope
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* @param queryString the query string
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* @return the string
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*/
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private static String purgeScopeFromQueryString(String scope, String queryString){
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// SCOPE is: /gcube/devsec/devVRE
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// [INFO ] 2016-04-05 15:01:42,808 org.gcube.datatransfer.resolver.gis.geonetwork.GeonetworkResolver -
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// Query String is: scope=/gcube/devsec/devVRE&version=2.0.2&request=GetCapabilities&service=CSW
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int start = queryString.indexOf(SCOPE+"=");
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if(start>=0){
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int end = queryString.indexOf("&", start);
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if(end==-1 && queryString.length()==(SCOPE+"="+scope).length()){ //SCOPE IS THE UNIQUE PARAMETER INTO QUETY STRING
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logger.debug("Scope is the unique parameter, returning empty query string");
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return "";
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}else if(end<queryString.length())
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return queryString.substring(end+1, queryString.length());
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}
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return queryString;
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}
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/* (non-Javadoc)
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* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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*/
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@Override
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protected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {
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String scope = req.getParameter(SCOPE);
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if (scope == null || scope.equals("")) {
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logger.debug("Scope not found");
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sendError(resp, HttpServletResponse.SC_BAD_REQUEST, SCOPE+" not found or empty");
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return;
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}
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logger.info("SCOPE is: " + scope);
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try {
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ServerParameters geonetworkParams = getGeonetworkCachedServerParameters(scope);
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HTTPCallsUtils httpUtils = new HTTPCallsUtils();
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boolean authorized = GNAuthentication.login(httpUtils, geonetworkParams.getUrl(), geonetworkParams.getUser(), geonetworkParams.getPassword());
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logger.trace("Authorized on "+geonetworkParams +" ? "+authorized);
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String gnCSWlURL = geonetworkParams.getUrl()+"/"+CSW_SERVER;
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logger.info("Sending CSW request to URL: "+gnCSWlURL);
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String response = httpUtils.post(gnCSWlURL, req.getInputStream(), req.getContentType());
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logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
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resp.setContentType(httpUtils.getLastContentType());
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InputStream in = IOUtils.toInputStream(response);
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OutputStream out = resp.getOutputStream();
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try{
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int bytes = IOUtils.copy(IOUtils.toInputStream(response), out);
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if(bytes==0)
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logger.warn("ResponseBody is empty, returning empty resp");
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}catch(Exception e){
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logger.error("Error on copy response:", e);
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}finally{
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IOUtils.closeQuietly(in);
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}
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} catch (IllegalArgumentException e){
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logger.error("IllegalArgumentException:", e);
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sendError(resp, HttpServletResponse.SC_BAD_REQUEST, "Illegal argument to carry out the request!");
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return;
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} catch (Exception e) {
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logger.error("Exception:", e);
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String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
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sendError(resp, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
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return;
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}
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}
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/**
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* Gets the geonetwork cached server parameters.
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*
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* @param scope the scope
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* @return the geonetwork cached server parameters
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* @throws Exception the exception
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*/
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protected ServerParameters getGeonetworkCachedServerParameters(String scope) throws Exception{
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if(cacheGNServerParams==null)
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resetCacheServerParameters();
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logger.info("Tentative for recovering geonetwork server parameters from cache with scope: "+scope);
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ServerParameters serverParam = cacheGNServerParams.get(scope);
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if(serverParam==null){
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logger.info("Cache having null Geonetwork server parameters, reading from IS..");
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GeoRuntimeReader reader = new GeoRuntimeReader();
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try {
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serverParam = reader.retrieveGisParameters(scope, GEO_SERVICE.GEONETWORK);
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cacheGNServerParams.put(scope, serverParam);
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logger.info("Updated Cache for Geonetwork server parameters! Scope "+scope+" linking "+serverParam);
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} catch (Exception e) {
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logger.error("An error occurred on reading application profile to "+GEO_SERVICE.GEONETWORK, e);
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throw new Exception("Sorry, An error occurred on reading configuration to "+GEO_SERVICE.GEONETWORK);
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}
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}else
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logger.info("Cache gis server param is not null using it");
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logger.info("returning geonetworkParams "+serverParam);
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return serverParam;
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}
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/**
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* Reset cache server parameter for scope.
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*
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* @param scope the scope
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*/
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private void resetCacheServerParameterForScope(String scope){
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if(cacheGNServerParams!=null && cacheGNServerParams.get(scope)!=null){
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cacheGNServerParams.remove(scope);
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logger.info("Reset of "+scope+" in Cache Geonetwork server params perfomed!");
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}else
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logger.info("Reset of "+scope+" in Cache Geonetwork skipped, scope not exists!");
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}
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/**
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* Reset cache server parameters.
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*/
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private void resetCacheServerParameters(){
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cacheGNServerParams = new HashMap<String, ServerParameters>();
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logger.info("Reset of Cache Geonetwork server params perfomed!");
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}
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/**
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* Gets the layer wms request.
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*
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* @param scope the scope
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* @param gisUUID the gis uuid
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* @param geonetworkParams the geonetwork params
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* @return the layer wms request
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* @throws Exception the exception
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*/
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protected String getLayerWmsRequest(String scope, String gisUUID, ServerParameters geonetworkParams) throws Exception{
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try {
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GeonetworkServiceInterface gntwAccess = new GeonetowrkAccessParameter(scope, geonetworkParams);
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return MetadataConverter.getWMSOnLineResource(gntwAccess.getGeonetworkInstance(true), gisUUID);
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}catch (GeonetworkInstanceException e){
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logger.error("An error occurred when instancing geonetowrk gis layer with UUID "+gisUUID, e);
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throw new IllegalArgumentException("Sorry, An error occurred when instancing geonetwork with UUID: "+gisUUID);
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} catch (Exception e) {
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logger.error("An error occurred when retrieving gis layer with UUID "+gisUUID, e);
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throw new IllegalArgumentException("Sorry, An error occurred when retrieving gis layer with UUID "+gisUUID);
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}
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}
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/**
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* Send error.
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*
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* @param response the response
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* @param status the status
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* @param message the message
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* @throws IOException Signals that an I/O exception has occurred.
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*/
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protected void sendError(HttpServletResponse response, int status, String message) throws IOException
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{
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// response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
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response.setStatus(status);
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logger.info("error message: "+message);
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logger.info("writing response...");
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StringReader sr = new StringReader(message);
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IOUtils.copy(sr, response.getOutputStream());
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// response.getWriter().write(resultMessage.toString());
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logger.info("response writed");
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response.flushBuffer();
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}
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/**
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* Url redirect.
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*
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* @param req the req
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* @param response the response
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* @param redirectTo the redirect to
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* @throws IOException Signals that an I/O exception has occurred.
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*/
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protected void urlRedirect(HttpServletRequest req, HttpServletResponse response, String redirectTo) throws IOException {
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response.sendRedirect(response.encodeRedirectURL(redirectTo));
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return;
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}
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/**
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* The main method.
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*
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* @param args the arguments
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*/
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public static void main(String[] args) {
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System.out.println(purgeScopeFromQueryString("/gcube/devsec/devVRE", "scope=/gcube/devsec/devVRE&version=2.0.2&request=GetCapabilities&service=CSW"));
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}
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}
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