/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-04 Wolfgang M. Meier
* wolfgang@exist-db.org
* http://exist.sourceforge.net
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id$
*/
package org.exist.source;
import java.io.*;
import java.net.ConnectException;
import java.net.URL;
import java.net.URLConnection;
import java.net.HttpURLConnection;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.exist.dom.QName;
import org.exist.security.PermissionDeniedException;
import org.exist.security.Subject;
import org.exist.storage.DBBroker;
/**
* A source implementation reading from an URL.
*
* @author wolf
*/
public class URLSource extends AbstractSource {
private final static Logger LOG = LogManager.getLogger(URLSource.class);
protected URL url;
private URLConnection connection = null;
private long lastModified = 0;
private int responseCode = HttpURLConnection.HTTP_OK;
protected URLSource() {
}
public URLSource(URL url) {
this.url = url;
}
@Override
public String path() {
final String protocol = url.getProtocol();
final String host = url.getHost();
if(protocol.equals("file") && (host == null || host.length() == 0 || "localhost".equals(host) || "127.0.0.1".equals(host)))
{
return url.getFile();
}
return url.toExternalForm();
}
@Override
public String type() {
final String protocol = url.getProtocol();
final String host = url.getHost();
if(protocol.equals("file") && (host == null || host.length() == 0 || "localhost".equals(host) || "127.0.0.1".equals(host)))
{
return "File";
}
return "URL";
}
protected void setURL(URL url) {
this.url = url;
}
public URL getURL() {
return url;
}
private long getLastModification() {
try {
if(connection == null)
{connection = url.openConnection();}
return connection.getLastModified();
} catch (final IOException e) {
LOG.warn("URL could not be opened: " + e.getMessage(), e);
return 0;
}
}
/* (non-Javadoc)
* @see org.exist.source.Source#getKey()
*/
public Object getKey() {
return url;
}
/* (non-Javadoc)
* @see org.exist.source.Source#isValid()
*/
public int isValid(DBBroker broker) {
final long modified = getLastModification();
if(modified == 0 && modified > lastModified)
{return INVALID;}
else
{return VALID;}
}
/* (non-Javadoc)
* @see org.exist.source.Source#isValid(org.exist.source.Source)
*/
public int isValid(Source other) {
return INVALID;
}
/* (non-Javadoc)
* @see org.exist.source.Source#getReader()
*/
public Reader getReader() throws IOException {
try {
if(connection == null) {
connection = url.openConnection();
if (connection instanceof HttpURLConnection)
{responseCode = ((HttpURLConnection) connection).getResponseCode();}
}
Reader reader = null;
if (responseCode != HttpURLConnection.HTTP_NOT_FOUND)
{reader = new InputStreamReader(connection.getInputStream(), "UTF-8");}
connection = null;
return reader;
} catch (final IOException e) {
LOG.warn("URL could not be opened: " + e.getMessage(), e);
throw e;
}
}
public InputStream getInputStream() throws IOException {
try {
if(connection == null) {
connection = url.openConnection();
if (connection instanceof HttpURLConnection)
{responseCode = ((HttpURLConnection) connection).getResponseCode();}
}
InputStream is = null;
if (responseCode != HttpURLConnection.HTTP_NOT_FOUND)
{is = connection.getInputStream();}
connection = null;
return is;
} catch (final ConnectException e){
LOG.warn("Unable to connect to URL: " + e.getMessage());
throw e;
} catch (final IOException e) {
LOG.warn("URL could not be opened: " + e.getMessage(), e);
throw e;
}
}
/* (non-Javadoc)
* @see org.exist.source.Source#getContent()
*/
public String getContent() throws IOException {
try {
if(connection == null) {
connection = url.openConnection();
if (connection instanceof HttpURLConnection)
{responseCode = ((HttpURLConnection) connection).getResponseCode();}
}
final String content = connection.getContent().toString();
connection = null;
return content;
} catch (final IOException e) {
LOG.warn("URL could not be opened: " + e.getMessage(), e);
return null;
}
}
public int getResponseCode() {
return responseCode;
}
public String toString() {
if (url == null)
{return "[not set]";}
return url.toString();
}
@Override
public void validate(Subject subject, int perm) throws PermissionDeniedException {
// TODO protected?
}
@Override
public QName isModule() throws IOException {
try (final InputStream is = getInputStream()) {
return getModuleDecl(is);
}
}
}