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uri-resolver/src/main/java/org/gcube/datatransfer/resolver/gis/geonetwork/GeonetworkResolver.java

680 lines
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Java
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/**
*
*/
package org.gcube.datatransfer.resolver.gis.geonetwork;
import static org.gcube.common.authorization.client.Constants.authorizationService;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.gcube.common.authorization.library.AuthorizationEntry;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.datatransfer.resolver.GeonetworkRequestFilterParameters;
import org.gcube.datatransfer.resolver.GeonetworkRequestFilterParameters.MODE;
import org.gcube.datatransfer.resolver.GeonetworkRequestFilterParameters.VISIBILITY;
import org.gcube.datatransfer.resolver.gis.GeonetworkAccessParameter;
import org.gcube.datatransfer.resolver.gis.GeonetworkInstance;
import org.gcube.datatransfer.resolver.gis.GeonetworkServiceInterface;
import org.gcube.datatransfer.resolver.gis.exception.GeonetworkInstanceException;
import org.gcube.datatransfer.resolver.gis.geonetwork.HTTPCallsUtils.HttpResponse;
import org.gcube.datatransfer.resolver.gis.util.GetResponseRecordFilter;
import org.gcube.spatial.data.geonetwork.configuration.Configuration;
import org.gcube.spatial.data.geonetwork.model.Account;
import org.gcube.spatial.data.geonetwork.model.Account.Type;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
/**
* The Class GeonetworkResolver.
*
* Works as a proxy in order to authenticate HTTP POST calls on gCube Geonetwork servers discovered by SCOPE on gCube Information System
* Used by gCube Data Catalog for harvesting metadata
*
* @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
* May 12, 2016
*/
public class GeonetworkResolver extends HttpServlet{
/**
*
*/
public static final String REPLACED_UUID_BY_FILTER_PLEASE_IGNORE =
"Replaced UUID by GeonetworkResolver filter, please ignore";
/**
*
*/
public static final String REPLACED_A_PUBLIC_UUID_PLEASE_IGNORE = "Replaced a public UUID, please ignore";
/**
*
*/
public static final String SRV_EN_MEF_EXPORT = "/srv/en/mef.export"; //MEF Geonetwork service
/**
*
*/
public static final String UUID = "uuid";
/**
*
*/
public static final String APPLICATION_XML = "application/xml";
/**
*
*/
private static final long serialVersionUID = -61097584153314181L;
public static final String SCOPE = "scope";
public static final String GCUBETOKEN = "gcube-token";
public static final String REMAIN_PATH_PARAM = "remainPath";
public static final String RESET_CACHE_PARAM = "resetcache";
public static final String RESET_CACHED_SCOPE_PARAM = "resetcachedscope";
public static final String CSW_SERVER = "srv/en/csw";
// public static final String PARAMETER_FILTER_PUBLIC_IDS = UriResolverRewriteFilter.PARAMETER_FILTER_PUBLIC_IDS;
// public static final String PARAMETER_NO_AUTHENTICATION = UriResolverRewriteFilter.PARAMETER_NO_AUTHENTICATION;
/** The logger. */
private static final Logger logger = LoggerFactory.getLogger(GeonetworkResolver.class);
protected Map<String, GeonetworkInstance> cacheGNInstances; //A cache: scope - GeonetworkInstance
private Timer timer;
//THIRTY MINUTES
public static final long CACHE_RESET_TIME = 30*60*1000;
//TEN SECONDS
public static final long CACHE_RESET_DELAY = 10*1000;
/* (non-Javadoc)
* @see javax.servlet.GenericServlet#init()
*/
@Override
public void init() throws ServletException {
super.init();
timer = new Timer(true);
timer.schedule(new TimerTask() {
@Override
public void run() {
logger.info("Resetting Geonetwork configuratiors cache...");
purgeCacheGeonetworkInstances();
}
}, CACHE_RESET_DELAY, CACHE_RESET_TIME);
}
/* (non-Javadoc)
* @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
* This call is not authenticated
*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
logger.info("doGET running... query string: "+req.getQueryString());
String scopeValue = req.getParameter(SCOPE);
String gCubeToken = req.getParameter(GCUBETOKEN);
String remainValue = req.getParameter(REMAIN_PATH_PARAM);
String mode = req.getParameter(GeonetworkRequestFilterParameters.MODE.class.getSimpleName());
String visibility = req.getParameter(GeonetworkRequestFilterParameters.VISIBILITY.class.getSimpleName());
String filterKeyParam = req.getParameter(GeonetworkRequestFilterParameters.FILTER_KEY);
String filterValueParam = req.getParameter(GeonetworkRequestFilterParameters.FILTER_VALUE);
String resetCache = req.getParameter(RESET_CACHE_PARAM);
String resetScope = req.getParameter(RESET_CACHED_SCOPE_PARAM);
String originalScope = ScopeProvider.instance.get();
if ((scopeValue == null || scopeValue.isEmpty()) && (gCubeToken==null || gCubeToken.isEmpty())) {
logger.debug("Scope not found");
sendError(resp, HttpServletResponse.SC_BAD_REQUEST, SCOPE+" and "+GCUBETOKEN+" not found or empty");
return;
}
MODE theMode;
VISIBILITY theVisibility;
theMode = GeonetworkRequestFilterParameters.MODE.valueOf(mode);
theVisibility = GeonetworkRequestFilterParameters.VISIBILITY.valueOf(visibility);
if(resetCache!=null && Boolean.parseBoolean(resetCache)){
purgeCacheGeonetworkInstances();
}
if(resetScope!=null && Boolean.parseBoolean(resetScope)){
resetGeonetoworkInstanceCacheForScope(scopeValue);
}
logger.info("SCOPE: " + scopeValue);
logger.info("GCUBETOKEN: " + gCubeToken);
logger.info("MODE is: "+theMode);
logger.info("VISIBILITY is: "+theVisibility);
logger.info(GeonetworkRequestFilterParameters.FILTER_KEY +" is: "+filterKeyParam);
logger.info(GeonetworkRequestFilterParameters.FILTER_VALUE +" is: "+filterValueParam);
try {
if(isValidToken(gCubeToken)){
AuthorizationEntry entry = authorizationService().get(gCubeToken);
//retrieve the info of the token owner
//entry.getClientInfo();
//retrieve the context of the token owner
scopeValue = entry.getContext();
logger.info("Got scope "+scopeValue+" from token: "+gCubeToken+" via authorization service");
}
GeonetworkInstance gnInstance = getGeonetworkInstanceForScope(scopeValue);
ScopeProvider.instance.set(scopeValue);
HTTPCallsUtils httpUtils = new HTTPCallsUtils();
Configuration config = gnInstance.getGeonetworkPublisher().getConfiguration();
String geonetworkUrl = config.getGeoNetworkEndpoint();
// boolean authorized = GNAuthentication.login(httpUtils, geonetworkParams.getUrl(), geonetworkParams.getUser(), geonetworkParams.getPassword());
// logger.trace("Authorized on "+geonetworkParams +" ? "+authorized);
String newQueryString = purgeScopeFromQueryString(scopeValue, req.getQueryString());
logger.trace("Purged query string from "+scopeValue+" is: "+newQueryString);
String baseURL = remainValue==null ||remainValue.isEmpty()?geonetworkUrl+"/"+CSW_SERVER:geonetworkUrl+"/"+CSW_SERVER+remainValue;
logger.trace("New base URL "+baseURL);
newQueryString = purgeRemainFromQueryString(remainValue, newQueryString);
logger.trace("Purged query string from "+remainValue+" is: "+newQueryString);
String gnGetlURL = newQueryString==null || newQueryString.isEmpty()? baseURL : baseURL+"?"+newQueryString;
logger.info("Sending get request to URL: "+gnGetlURL);
HttpResponse response = httpUtils.get(gnGetlURL);
switch(response.getStatus()){
case HttpServletResponse.SC_OK:
logger.info("Response return Content-Type: "+httpUtils.getLastContentType());
resp.setContentType(httpUtils.getLastContentType());
InputStream in = IOUtils.toInputStream(response.getResponse());
OutputStream out = resp.getOutputStream();
try{
int bytes = IOUtils.copy(in, out);
if(bytes==0)
logger.warn("ResponseBody is empty, returning empty resp");
}catch(Exception e){
logger.error("Error on copy response:", e);
}finally{
IOUtils.closeQuietly(in);
}
break;
case HttpServletResponse.SC_FORBIDDEN:
sendError(resp, response.getStatus(), "Sorry, you are not authorized to perform this request");
break;
default:
sendError(resp, response.getStatus(), "Sorry, an error occurred on resolving geonetwork request with scope "+scopeValue);
}
} catch (Exception e) {
logger.error("Exception:", e);
String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scopeValue+". Please, contact support!";
sendError(resp, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
return;
}finally{
if(originalScope!=null){
ScopeProvider.instance.set(originalScope);
logger.info("scope provider set to orginal scope: "+originalScope);
}else{
ScopeProvider.instance.reset();
logger.info("scope provider reset");
}
}
}
/* (non-Javadoc)
* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
* This call is authenticated
*/
@SuppressWarnings("resource")
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {
/*MultiReadHttpServletRequest req2;
if(req instanceof MultiReadHttpServletRequest)
req2 = (MultiReadHttpServletRequest) req;*/
String originalScope = ScopeProvider.instance.get();
logger.info("doPost running...");
String scope = req.getParameter(SCOPE);
String gCubeToken = req.getParameter(GCUBETOKEN);
String remainValue = req.getParameter(REMAIN_PATH_PARAM);
String mode = req.getParameter(GeonetworkRequestFilterParameters.MODE.class.getSimpleName());
String visibility = req.getParameter(GeonetworkRequestFilterParameters.VISIBILITY.class.getSimpleName());
//HOW TO PASS MORE THAN ONE?
String filterKeyParam = req.getParameter(GeonetworkRequestFilterParameters.FILTER_KEY);
String filterValueParam = req.getParameter(GeonetworkRequestFilterParameters.FILTER_VALUE);
Map<String,String> filters = new HashMap<String, String>();
//boolean filterPublicMetadata = false;
boolean noAuthenticationB = false;
MODE theMode;
VISIBILITY theVisibility;
if ((scope == null || scope.isEmpty()) && (gCubeToken==null || gCubeToken.isEmpty())) {
logger.debug("Scope not found");
sendError(resp, HttpServletResponse.SC_BAD_REQUEST, SCOPE+" and "+GCUBETOKEN+" not found or empty");
return;
}
theMode = GeonetworkRequestFilterParameters.MODE.valueOf(mode);
theVisibility = GeonetworkRequestFilterParameters.VISIBILITY.valueOf(visibility);
logger.info(SCOPE +" is: " + scope);
logger.info(GeonetworkRequestFilterParameters.MODE.class.getSimpleName() +" is: "+theMode);
logger.info(GeonetworkRequestFilterParameters.VISIBILITY.class.getSimpleName() +" is: "+theVisibility);
logger.info(GeonetworkRequestFilterParameters.FILTER_KEY +" are: "+filterKeyParam);
logger.info(GeonetworkRequestFilterParameters.FILTER_VALUE +" are: "+filterValueParam);
if(filterKeyParam!=null && filterValueParam!=null){
filters.put(filterKeyParam, filterValueParam);
logger.debug("Added filter parmas to map filters: "+filters);
}
try {
if(isValidToken(gCubeToken)){
AuthorizationEntry entry = authorizationService().get(gCubeToken);
//retrieve the info of the token owner
//entry.getClientInfo();
//retrieve the context of the token owner
scope = entry.getContext();
logger.info("Got scope "+scope+" from token: "+gCubeToken+" via authorization service");
}
GeonetworkServiceInterface gntwAccess = new GeonetworkAccessParameter(scope);
GeonetworkInstance gnInstance = gntwAccess.getGeonetworkInstance();
ScopeProvider.instance.set(scope);
logger.info("set scope provider "+scope);
Configuration config = gnInstance.getGeonetworkPublisher().getConfiguration();
Account account = config.getScopeConfiguration().getAccounts().get(Type.CKAN);
logger.info("CKAN user owner is: "+account.getUser());
logger.info("Parameters..");
for (Enumeration<String> e = req.getParameterNames(); e.hasMoreElements();){
String p = e.nextElement();
logger.debug("param "+p + " value "+Arrays.toString(req.getParameterValues(p)));
}
//DEBUG BODY
// String readBody = IOUtils.toString(req.getReader());
// logger.debug("doPost read body request: "+readBody);
ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
String geonetworkUrl = config.getGeoNetworkEndpoint();
// SPECIFIC HANDLER FOR GEONETWORK REQUEST: /srv/en/mef.export
String gnCSWlURL;
if(remainValue!=null && remainValue.compareTo(SRV_EN_MEF_EXPORT)==0){
logger.info("In case of mef.export, perfoming a custom handler");
gnCSWlURL = geonetworkUrl + SRV_EN_MEF_EXPORT;
String[] uuidValues = req.getParameterValues(UUID);
if(uuidValues!=null){
String data = null;
for (String uuid : uuidValues) {
data = UUID+"="+uuid;
}
if(data!=null){
logger.debug("Writing "+data +" into byte array");
byteArray.write(data.getBytes());
}else
IOUtils.copy(req.getReader(), byteArray);
}else
IOUtils.copy(req.getReader(), byteArray);
}else{
gnCSWlURL = remainValue==null ||remainValue.isEmpty()?geonetworkUrl+"/"+CSW_SERVER:geonetworkUrl+"/"+CSW_SERVER+remainValue;
IOUtils.copy(req.getReader(), byteArray);
}
//filterPublicMetadata = theVisibility.equals(VISIBILITY.PRV)?true:false;
HTTPCallsUtils httpUtils = new HTTPCallsUtils();
//String theOwner = null;
//PRIVATE LAYERS
if(theVisibility.equals(VISIBILITY.PRV)){
logger.debug("Visibility: "+VISIBILITY.PRV+" getting private layers..");
//VRE LAYERS
if(theMode.equals(MODE.VRE)){
logger.debug("Getting "+MODE.VRE+" layers..");
//HARVESTED LAYERS
}else{
// logger.debug("Getting "+MODE.HARVEST+" layers, I'm using filters [key: '"+filter_keys +"' and value: '"+filter_values +"'] passed as parameter to filter layer/s returned..");
// if(filter_keys==null || filter_keys.isEmpty() || filter_values==null || filter_values.isEmpty()){
// String error = "Harvest owner is missing. It is not possible to filter layers for the request "+MODE.HARVEST + " in the scope: "+scope+", without a valid filter as input";
// logger.error(error);
// sendError(resp, HttpServletResponse.SC_BAD_REQUEST, error);
// return;
// }
filters.put("isHarvested", "y");
logger.debug("Getting "+MODE.HARVEST+" layers, I'm using filters ["+filters+"]");
}
if(account.getUser()!=null){
boolean authorized = GNAuthentication.login(httpUtils, geonetworkUrl, account.getUser(), account.getPassword());
logger.trace("Authorized on "+geonetworkUrl +" ? "+authorized);
}else
logger.info("Skipping authentication, ckan user (the owner) is null");
//PUBLIC LAYERS
}else{
logger.debug("Visibility: "+VISIBILITY.PUB+" getting public layers..");
//VRE LAYERS
if(theMode.equals(MODE.VRE)){
logger.debug("Getting "+MODE.VRE+" layers, the VRE account: "+account.getUser() +" will be used as owner user for filtering... Is it right?");
filters.put("ownername", account.getUser());
//HARVESTED LAYERS
}else{
// logger.debug("Getting "+MODE.HARVEST+" layers, I'm using filters [key: '"+filter_keys +"' and value: '"+filter_values +"'] passed as parameter to filter layer/s returned..");
// if(filter_keys==null || filter_keys.isEmpty() || filter_values==null || filter_values.isEmpty()){
// String error = "Harvest owner is missing. It is not possible to filter layers for the request "+MODE.HARVEST + " in the scope: "+scope+", without a valid filter as input";
// logger.error(error);
// sendError(resp, HttpServletResponse.SC_BAD_REQUEST, error);
// return;
// }
filters.put("isHarvested", "y");
logger.debug("Getting "+MODE.HARVEST+" layers, I'm using filters ["+filters+"] as default");
}
}
logger.info("Sending CSW POST request to URL: "+gnCSWlURL);
logger.debug("Content-Type: "+req.getContentType());
//DEBUG
//logger.debug("POST - BODY: "+byteArray.toString());
String body = byteArray.toString();
InputStream in = httpUtils.post(gnCSWlURL, new ByteArrayInputStream(byteArray.toByteArray()), req.getContentType(), req.getParameterMap());
//END DEBUG
logger.debug("Response return Content-Type: "+httpUtils.getLastContentType());
resp.setContentType(httpUtils.getLastContentType());
OutputStream out = resp.getOutputStream();
if(in==null){
logger.warn("Input stream returned is null, sending "+HttpServletResponse.SC_NOT_FOUND);
resp.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
try{
ReusableInputStream reus = new ReusableInputStream(in);
if(theVisibility.equals(VISIBILITY.PRV)){
logger.info("Private VISIBILITY getting public file identifiers to remove them...");
FilterGetRecords filterGetRecords = FilterGetRecords.getInstance();
List<String> publicIds = filterGetRecords.getPublicFileIdentifiers(body, true);
if(publicIds!=null && publicIds.size()>0){
logger.info("I'm removing list of public IDs with "+publicIds.size() +" item/s. Is it right?");
//System.out.println("The response is: "+IOUtils.toString(reus));
Document doc = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
doc = GetResponseRecordFilter.overrideResponseIdsByListIds(doc, filterGetRecords.getFoundPublicIds(), REPLACED_A_PUBLIC_UUID_PLEASE_IGNORE);
in = GetResponseRecordFilter.w3CDocumentToInputStream(doc);
//in = GetResponseRecordFilter.overrideResponseIdsByListIds(reus, publicIds, REPLACED_A_PUBLIC_UUID_PLEASE_IGNORE);
}
}
if(filters.size()>0){
logger.info("Applying filtering on geonet:info...");
Document doc = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
List<String> fileIdentifiers = GetResponseRecordFilter.getTextContentStringsForTagName(doc, "gmd:fileIdentifier");
List<String> noMatchingFilter = new ArrayList<String>();
for (String fileId : fileIdentifiers) {
//CKECKING THE FILTERS
for (String fkey : filters.keySet()) {
String value = GetResponseRecordFilter.getMetadataValueByFileIdentifier(fileId, config.getGeoNetworkEndpoint(),config.getAdminAccount().getUser(), config.getAdminAccount().getPassword(), fkey);
//String own = GetResponseRecordFilter.getMetaOwnerNameByFileIdentifier(fileId, config.getGeoNetworkEndpoint(),config.getAdminAccount().getUser(), config.getAdminAccount().getPassword());
String fValue = filters.get(fkey);
if(value!=null && value.compareTo(fValue)!=0){
logger.debug(fkey +" of file Identifier "+fileId+" not matching the filter: "+fkey+" with value: "+fValue+", adding it to list to remove file identifier and exit from loop..");
noMatchingFilter.add(fileId);
//WHEN I ADD THE FILE IDENTIFIER TO FILTERED ID, I CAN EXIT FROM CKECKING FILTERS LOOP
break;
}
}
}
if(noMatchingFilter.size()>0){
logger.info("Removing "+noMatchingFilter.size()+" layer/s not macthing the filters: "+filters);
//Document doc2 = GetResponseRecordFilter.inputStreamToW3CDocument(reus);
doc = GetResponseRecordFilter.overrideResponseIdsByListIds(doc, noMatchingFilter, REPLACED_UUID_BY_FILTER_PLEASE_IGNORE);
in = GetResponseRecordFilter.w3CDocumentToInputStream(doc);
}else{
logger.info("No replace on UUIDs was applied from filters: "+filters);
in = reus;
}
}
ReusableInputStream reusIs = new ReusableInputStream(in);
int bytes = IOUtils.copy(reusIs, out);
//logger.trace("POST - RETURN : "+IOUtils.toString(reusIs));
if(bytes==0)
logger.warn("ResponseBody is empty, returning empty resp");
}catch(Exception e){
logger.error("Error on copy response:", e);
}finally{
IOUtils.closeQuietly(in);
}
} catch (IllegalArgumentException e){
logger.error("IllegalArgumentException:", e);
sendError(resp, HttpServletResponse.SC_BAD_REQUEST, "Illegal argument to carry out the request!");
return;
} catch (Exception e) {
logger.error("Exception:", e);
String error = "Sorry, an error occurred on resolving geonetwork request with scope "+scope+". Please, contact support!";
sendError(resp, HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error);
return;
}finally{
if(originalScope!=null){
ScopeProvider.instance.set(originalScope);
logger.info("scope provider set to orginal scope: "+originalScope);
}else{
ScopeProvider.instance.reset();
logger.info("scope provider reset");
}
}
}
/**
* Purge remain from query string.
*
* @param remain_value the scope
* @param queryString the query string
* @return the string
*/
private static String purgeRemainFromQueryString(String remain_value, String queryString){
// SCOPE is: /gcube/devsec/devVRE
// [INFO ] 2016-04-05 15:01:42,808 org.gcube.datatransfer.resolver.gis.geonetwork.GeonetworkResolver -
// Query String is: scope=/gcube/devsec/devVRE&version=2.0.2&request=GetCapabilities&service=CSW
int start = queryString.indexOf(REMAIN_PATH_PARAM+"=");
if(start>=0){
int end = queryString.indexOf("&", start);
if(end==-1 && queryString.length()==(REMAIN_PATH_PARAM+"="+remain_value).length()){ //SCOPE IS THE UNIQUE PARAMETER INTO QUETY STRING
logger.debug("Scope is the unique parameter, returning empty query string");
return "";
}else if(end<queryString.length())
return queryString.substring(end+1, queryString.length());
}
return queryString;
}
/**
* Purge scope from query string.
*
* @param scope_value the scope
* @param queryString the query string
* @return the string
*/
private static String purgeScopeFromQueryString(String scope_value, String queryString){
// SCOPE is: /gcube/devsec/devVRE
// [INFO ] 2016-04-05 15:01:42,808 org.gcube.datatransfer.resolver.gis.geonetwork.GeonetworkResolver -
// Query String is: scope=/gcube/devsec/devVRE&version=2.0.2&request=GetCapabilities&service=CSW
int start = queryString.indexOf(SCOPE+"=");
if(start>=0){
int end = queryString.indexOf("&", start);
if(end==-1 && queryString.length()==(SCOPE+"="+scope_value).length()){ //SCOPE IS THE UNIQUE PARAMETER INTO QUETY STRING
logger.debug("Scope is the unique parameter, returning empty query string");
return "";
}else if(end<queryString.length())
return queryString.substring(end+1, queryString.length());
}
return queryString;
}
/**
* Gets the geonetwork instance for scope.
*
* @param scope the scope
* @return the geonetwork instance for scope
* @throws Exception the exception
*/
protected GeonetworkInstance getGeonetworkInstanceForScope(String scope) throws Exception{
if(cacheGNInstances==null)
purgeCacheGeonetworkInstances();
logger.info("Attempt to get geonetwork instance from GeonetworkInstance cache for scope: "+scope);
GeonetworkInstance geoInstance = cacheGNInstances.get(scope);
if(geoInstance==null){
logger.info("Cache having null GeonetworkInstance for scope "+scope+", reading by Geonetwork library...");
try {
geoInstance = discoveryGeonetworkInstance(scope);
cacheGNInstances.put(scope, geoInstance);
logger.info("Updated GeonetworkInstance Cache adding couple: Scope "+scope+" - GeonetworkInstance "+geoInstance);
} catch (Exception e) {
logger.error("An error occurred on reading GeonetworkInstance for scope "+scope, e);
throw new Exception("Sorry, An error occurred on reading GeonetworkInstance for scope "+scope);
}
}else
logger.info("GeonetworkInstance cache for scope: "+scope+" is not null using it: "+geoInstance);
return geoInstance;
}
/**
* Discovery geonetwork instance.
*
* @param scope the scope
* @return the geonetwork instance
* @throws GeonetworkInstanceException the geonetwork instance exception
*/
private GeonetworkInstance discoveryGeonetworkInstance(String scope) throws GeonetworkInstanceException{
GeonetworkAccessParameter gntwAccess = new GeonetworkAccessParameter(scope);
return gntwAccess.getGeonetworkInstance(true, null);
}
/**
* Reset geonetowork instance cache for scope.
*
* @param scope the scope
*/
private void resetGeonetoworkInstanceCacheForScope(String scope){
if(cacheGNInstances!=null && cacheGNInstances.get(scope)!=null){
cacheGNInstances.remove(scope);
logger.info("Reset of "+scope+" in Cache Geonetwork server params perfomed!");
}else
logger.info("Reset of "+scope+" in Cache Geonetwork skipped, scope not exists!");
}
/**
* Purge cache geonetwork instances.
*/
private void purgeCacheGeonetworkInstances(){
cacheGNInstances = new HashMap<String, GeonetworkInstance>();
logger.info("Reset of GeonetworkInstance cache perfomed!");
}
/**
* Send error.
*
* @param response the response
* @param status the status
* @param message the message
* @throws IOException Signals that an I/O exception has occurred.
*/
protected void sendError(HttpServletResponse response, int status, String message) throws IOException
{
// response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
response.setStatus(status);
logger.info("error message: "+message);
logger.info("writing response...");
StringReader sr = new StringReader(message);
IOUtils.copy(sr, response.getOutputStream());
// response.getWriter().write(resultMessage.toString());
logger.info("response writed");
response.flushBuffer();
}
/**
* Url redirect.
*
* @param req the req
* @param response the response
* @param redirectTo the redirect to
* @throws IOException Signals that an I/O exception has occurred.
*/
protected void urlRedirect(HttpServletRequest req, HttpServletResponse response, String redirectTo) throws IOException {
response.sendRedirect(response.encodeRedirectURL(redirectTo));
return;
}
/**
* Checks if is valid token.
*
* @param gCubeToken the g cube token
* @return true, if is valid token
*/
public static boolean isValidToken(String gCubeToken){
return gCubeToken!=null && !gCubeToken.isEmpty() && !(gCubeToken.compareTo("null")==0);
}
}
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