261 lines
9.9 KiB
Java
261 lines
9.9 KiB
Java
|
/**
|
|||
|
* Copyright (C) 2007 - 2016 52°North Initiative for Geospatial Open Source
|
|||
|
* Software GmbH
|
|||
|
*
|
|||
|
* This program is free software; you can redistribute it and/or modify it
|
|||
|
* under the terms of the GNU General Public License version 2 as published
|
|||
|
* by the Free Software Foundation.
|
|||
|
*
|
|||
|
* If the program is linked with libraries which are licensed under one of
|
|||
|
* the following licenses, the combination of the program with the linked
|
|||
|
* library is not considered a "derivative work" of the program:
|
|||
|
*
|
|||
|
* • Apache License, version 2.0
|
|||
|
* • Apache Software License, version 1.0
|
|||
|
* • GNU Lesser General Public License, version 3
|
|||
|
* • Mozilla Public License, versions 1.0, 1.1 and 2.0
|
|||
|
* • Common Development and Distribution License (CDDL), version 1.0
|
|||
|
*
|
|||
|
* Therefore the distribution of the program linked with libraries licensed
|
|||
|
* under the aforementioned licenses, is permitted by the copyright holders
|
|||
|
* if the distribution is compliant with both the GNU General Public
|
|||
|
* License version 2 and the aforementioned licenses.
|
|||
|
*
|
|||
|
* 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 General
|
|||
|
* Public License for more details.
|
|||
|
*/
|
|||
|
package org.n52.wps.server;
|
|||
|
|
|||
|
import java.io.IOException;
|
|||
|
import java.io.InputStream;
|
|||
|
import java.io.OutputStream;
|
|||
|
import java.io.PrintWriter;
|
|||
|
import java.util.UUID;
|
|||
|
|
|||
|
import javax.servlet.ServletConfig;
|
|||
|
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.apache.commons.lang.StringUtils;
|
|||
|
import org.n52.wps.server.database.DatabaseFactory;
|
|||
|
import org.n52.wps.server.database.IDatabase;
|
|||
|
import org.n52.wps.commons.MIMEUtil;
|
|||
|
import org.n52.wps.commons.XMLUtil;
|
|||
|
import org.slf4j.Logger;
|
|||
|
import org.slf4j.LoggerFactory;
|
|||
|
|
|||
|
public class RetrieveResultServlet extends HttpServlet {
|
|||
|
|
|||
|
private final static Logger LOGGER = LoggerFactory.getLogger(RetrieveResultServlet.class);
|
|||
|
private static final long serialVersionUID = -268198171054599696L;
|
|||
|
// This is required for URL generation for response documents.
|
|||
|
public final static String SERVLET_PATH = "RetrieveResultServlet";
|
|||
|
// in future parameterize
|
|||
|
private final boolean indentXML = false;
|
|||
|
|
|||
|
private final int uuid_length = 36;
|
|||
|
|
|||
|
@Override
|
|||
|
public void init(ServletConfig config) throws ServletException {
|
|||
|
super.init(config);
|
|||
|
}
|
|||
|
|
|||
|
@Override
|
|||
|
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
|
|||
|
|
|||
|
// id of result to retrieve.
|
|||
|
String id = request.getParameter("id");
|
|||
|
|
|||
|
// optional alternate name for filename (rename the file when retrieving
|
|||
|
// if requested)
|
|||
|
boolean altName = false;
|
|||
|
String alternateFilename = request.getParameter("filename");
|
|||
|
if (!StringUtils.isEmpty(alternateFilename)) {
|
|||
|
altName = true;
|
|||
|
}
|
|||
|
|
|||
|
// return result as attachment (instructs browser to offer user "Save" dialog)
|
|||
|
String attachment = request.getParameter("attachment");
|
|||
|
|
|||
|
if (StringUtils.isEmpty(id)) {
|
|||
|
errorResponse("id parameter missing", response);
|
|||
|
} else {
|
|||
|
|
|||
|
if(!isIDValid(id)){
|
|||
|
errorResponse("id parameter not valid", response);
|
|||
|
}
|
|||
|
|
|||
|
IDatabase db = DatabaseFactory.getDatabase();
|
|||
|
String mimeType = db.getMimeTypeForStoreResponse(id);
|
|||
|
long contentLength = db.getContentLengthForStoreResponse(id);
|
|||
|
|
|||
|
InputStream inputStream = null;
|
|||
|
OutputStream outputStream = null;
|
|||
|
try {
|
|||
|
inputStream = db.lookupResponse(id);
|
|||
|
|
|||
|
if (inputStream == null) {
|
|||
|
errorResponse("id " + id + " is unknown to server", response);
|
|||
|
} else if (mimeType == null) {
|
|||
|
errorResponse("Unable to determine mime-type for id " + id, response);
|
|||
|
} else {
|
|||
|
String suffix = MIMEUtil.getSuffixFromMIMEType(mimeType).toLowerCase();
|
|||
|
|
|||
|
// if attachment parameter unset, default to false for mime-type of 'xml' and true for everything else.
|
|||
|
boolean useAttachment = (StringUtils.isEmpty(attachment) && !"xml".equals(suffix)) || Boolean.parseBoolean(attachment);
|
|||
|
if (useAttachment) {
|
|||
|
String attachmentName = (new StringBuilder(id)).append('.').append(suffix).toString();
|
|||
|
|
|||
|
if (altName) {
|
|||
|
attachmentName = (new StringBuilder(alternateFilename)).append('.').append(suffix).toString();
|
|||
|
}
|
|||
|
response.addHeader("Content-Disposition", "attachment; filename=\"" + attachmentName + "\"");
|
|||
|
}
|
|||
|
|
|||
|
response.setContentType(mimeType);
|
|||
|
|
|||
|
if ("xml".equals(suffix)) {
|
|||
|
|
|||
|
// NOTE: We don't set "Content-Length" header, xml may be modified
|
|||
|
|
|||
|
// need these to work around aggressive IE 8 caching.
|
|||
|
response.addHeader("Cache-Control", "no-cache, no-store");
|
|||
|
response.addHeader("Pragma", "no-cache");
|
|||
|
response.addHeader("Expires", "-1");
|
|||
|
|
|||
|
try {
|
|||
|
outputStream = response.getOutputStream();
|
|||
|
} catch (IOException e) {
|
|||
|
throw new IOException("Error obtaining output stream for response", e);
|
|||
|
}
|
|||
|
copyResponseAsXML(inputStream, outputStream, useAttachment || indentXML, id);
|
|||
|
} else {
|
|||
|
|
|||
|
if (contentLength > -1) {
|
|||
|
// Can't use response.setContentLength(...) as it accepts an int (max of 2^31 - 1) ?!
|
|||
|
// response.setContentLength(contentLength);
|
|||
|
response.setHeader("Content-Length", Long.toString(contentLength));
|
|||
|
} else {
|
|||
|
LOGGER.warn("Content-Length unknown for response to id {}", id);
|
|||
|
}
|
|||
|
|
|||
|
try {
|
|||
|
outputStream = response.getOutputStream();
|
|||
|
} catch (IOException e) {
|
|||
|
throw new IOException("Error obtaining output stream for response", e);
|
|||
|
}
|
|||
|
copyResponseStream(inputStream, outputStream, id, contentLength);
|
|||
|
}
|
|||
|
}
|
|||
|
} catch (Exception e) {
|
|||
|
logException(e);
|
|||
|
} finally {
|
|||
|
IOUtils.closeQuietly(inputStream);
|
|||
|
IOUtils.closeQuietly(outputStream);
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
protected void errorResponse(String error, HttpServletResponse response) throws IOException {
|
|||
|
response.setContentType("text/html");
|
|||
|
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
|
|||
|
PrintWriter writer = response.getWriter();
|
|||
|
writer.write("<html><title>Error</title><body>" + error + "</body></html>");
|
|||
|
writer.flush();
|
|||
|
LOGGER.warn("Error processing response: " + error);
|
|||
|
}
|
|||
|
|
|||
|
protected void copyResponseStream(
|
|||
|
InputStream inputStream,
|
|||
|
OutputStream outputStream,
|
|||
|
String id,
|
|||
|
long contentLength) throws IOException {
|
|||
|
long contentWritten = 0;
|
|||
|
try {
|
|||
|
byte[] buffer = new byte[8192];
|
|||
|
int bufferRead;
|
|||
|
while ((bufferRead = inputStream.read(buffer)) != -1) {
|
|||
|
outputStream.write(buffer, 0, bufferRead);
|
|||
|
contentWritten += bufferRead;
|
|||
|
}
|
|||
|
} catch (IOException e) {
|
|||
|
String exceptionMessage = contentLength > -1
|
|||
|
? String.format("Error writing response to output stream for id %s, %d of %d bytes written", id, contentWritten, contentLength)
|
|||
|
: String.format("Error writing response to output stream for id %s, %d bytes written", id, contentWritten);
|
|||
|
throw new IOException(exceptionMessage, e);
|
|||
|
}
|
|||
|
LOGGER.info("{} bytes written in response to id {}", contentWritten, id);
|
|||
|
}
|
|||
|
|
|||
|
protected void copyResponseAsXML(
|
|||
|
InputStream inputStream,
|
|||
|
OutputStream outputStream,
|
|||
|
boolean indent,
|
|||
|
String id) throws IOException {
|
|||
|
try {
|
|||
|
XMLUtil.copyXML(inputStream, outputStream, indent);
|
|||
|
} catch (IOException e) {
|
|||
|
throw new IOException("Error writing XML response for id " + id, e);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
private void logException(Exception exception) {
|
|||
|
StringBuilder errorBuilder = new StringBuilder(exception.getMessage());
|
|||
|
Throwable cause = getRootCause(exception);
|
|||
|
if (cause != exception) {
|
|||
|
errorBuilder.append(", exception message: ").append(cause.getMessage());
|
|||
|
}
|
|||
|
LOGGER.error(errorBuilder.toString());
|
|||
|
}
|
|||
|
|
|||
|
public static Throwable getRootCause(Throwable t) {
|
|||
|
return t.getCause() == null ? t : getRootCause(t.getCause());
|
|||
|
}
|
|||
|
|
|||
|
public boolean isIDValid(String id){
|
|||
|
|
|||
|
if(id.length() <= uuid_length){
|
|||
|
|
|||
|
try {
|
|||
|
UUID checkUUID = UUID.fromString(id);
|
|||
|
|
|||
|
if(checkUUID.toString().equals(id)){
|
|||
|
return true;
|
|||
|
}else{
|
|||
|
return false;
|
|||
|
}
|
|||
|
} catch (Exception e) {
|
|||
|
return false;
|
|||
|
}
|
|||
|
|
|||
|
}else {
|
|||
|
|
|||
|
String uuidPartOne = id.substring(0, uuid_length);
|
|||
|
String uuidPartTwo = id.substring(id.length() - uuid_length, id.length());
|
|||
|
|
|||
|
return isUUIDValid(uuidPartOne) && isUUIDValid(uuidPartTwo);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
public boolean isUUIDValid(String uuid) {
|
|||
|
|
|||
|
// the following can be used to check whether the id is a valid UUID
|
|||
|
try {
|
|||
|
UUID checkUUID = UUID.fromString(uuid);
|
|||
|
|
|||
|
if (checkUUID.toString().equals(uuid)) {
|
|||
|
return true;
|
|||
|
} else {
|
|||
|
return false;
|
|||
|
}
|
|||
|
} catch (Exception e) {
|
|||
|
return false;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|