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org.apache.catalina.ssi.SSIServletExternalResolver Maven / Gradle / Ivy
Tomcat Servlet Engine Core Classes and Standard implementations
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.ssi;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.Locale;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.connector.Request;
import org.apache.coyote.Constants;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.http.RequestUtil;
/**
* An implementation of SSIExternalResolver that is used with servlets.
*
* @author Dan Sandberg
* @author David Becker
*/
public class SSIServletExternalResolver implements SSIExternalResolver {
protected final String VARIABLE_NAMES[] = {"AUTH_TYPE", "CONTENT_LENGTH",
"CONTENT_TYPE", "DOCUMENT_NAME", "DOCUMENT_URI",
"GATEWAY_INTERFACE", "HTTP_ACCEPT", "HTTP_ACCEPT_ENCODING",
"HTTP_ACCEPT_LANGUAGE", "HTTP_CONNECTION", "HTTP_HOST",
"HTTP_REFERER", "HTTP_USER_AGENT", "PATH_INFO", "PATH_TRANSLATED",
"QUERY_STRING", "QUERY_STRING_UNESCAPED", "REMOTE_ADDR",
"REMOTE_HOST", "REMOTE_PORT", "REMOTE_USER", "REQUEST_METHOD",
"REQUEST_URI", "SCRIPT_FILENAME", "SCRIPT_NAME", "SERVER_ADDR",
"SERVER_NAME", "SERVER_PORT", "SERVER_PROTOCOL", "SERVER_SOFTWARE",
"UNIQUE_ID"};
protected final ServletContext context;
protected final HttpServletRequest req;
protected final HttpServletResponse res;
protected final boolean isVirtualWebappRelative;
protected final int debug;
protected final String inputEncoding;
public SSIServletExternalResolver(ServletContext context,
HttpServletRequest req, HttpServletResponse res,
boolean isVirtualWebappRelative, int debug, String inputEncoding) {
this.context = context;
this.req = req;
this.res = res;
this.isVirtualWebappRelative = isVirtualWebappRelative;
this.debug = debug;
this.inputEncoding = inputEncoding;
}
@Override
public void log(String message, Throwable throwable) {
//We can't assume that Servlet.log( message, null )
//is the same as Servlet.log( message ), since API
//doesn't seem to say so.
if (throwable != null) {
context.log(message, throwable);
} else {
context.log(message);
}
}
@Override
public void addVariableNames(Collection variableNames) {
for (int i = 0; i < VARIABLE_NAMES.length; i++) {
String variableName = VARIABLE_NAMES[i];
String variableValue = getVariableValue(variableName);
if (variableValue != null) {
variableNames.add(variableName);
}
}
Enumeration e = req.getAttributeNames();
while (e.hasMoreElements()) {
String name = e.nextElement();
if (!isNameReserved(name)) {
variableNames.add(name);
}
}
}
protected Object getReqAttributeIgnoreCase(String targetName) {
Object object = null;
if (!isNameReserved(targetName)) {
object = req.getAttribute(targetName);
if (object == null) {
Enumeration e = req.getAttributeNames();
while (e.hasMoreElements()) {
String name = e.nextElement();
if (targetName.equalsIgnoreCase(name)
&& !isNameReserved(name)) {
object = req.getAttribute(name);
if (object != null) {
break;
}
}
}
}
}
return object;
}
protected boolean isNameReserved(String name) {
return name.startsWith("java.") || name.startsWith("javax.")
|| name.startsWith("sun.");
}
@Override
public void setVariableValue(String name, String value) {
if (!isNameReserved(name)) {
req.setAttribute(name, value);
}
}
@Override
public String getVariableValue(String name) {
String retVal = null;
Object object = getReqAttributeIgnoreCase(name);
if (object != null) {
retVal = object.toString();
} else {
retVal = getCGIVariable(name);
}
return retVal;
}
protected String getCGIVariable(String name) {
String retVal = null;
String[] nameParts = name.toUpperCase(Locale.ENGLISH).split("_");
int requiredParts = 2;
if (nameParts.length == 1) {
if (nameParts[0].equals("PATH")) {
requiredParts = 1;
}
}
else if (nameParts[0].equals("AUTH")) {
if (nameParts[1].equals("TYPE")) {
retVal = req.getAuthType();
}
} else if(nameParts[0].equals("CONTENT")) {
if (nameParts[1].equals("LENGTH")) {
long contentLength = req.getContentLengthLong();
if (contentLength >= 0) {
retVal = Long.toString(contentLength);
}
} else if (nameParts[1].equals("TYPE")) {
retVal = req.getContentType();
}
} else if (nameParts[0].equals("DOCUMENT")) {
if (nameParts[1].equals("NAME")) {
String requestURI = req.getRequestURI();
retVal = requestURI.substring(requestURI.lastIndexOf('/') + 1);
} else if (nameParts[1].equals("URI")) {
retVal = req.getRequestURI();
}
} else if (name.equalsIgnoreCase("GATEWAY_INTERFACE")) {
retVal = "CGI/1.1";
} else if (nameParts[0].equals("HTTP")) {
if (nameParts[1].equals("ACCEPT")) {
String accept = null;
if (nameParts.length == 2) {
accept = "Accept";
} else if (nameParts[2].equals("ENCODING")) {
requiredParts = 3;
accept = "Accept-Encoding";
} else if (nameParts[2].equals("LANGUAGE")) {
requiredParts = 3;
accept = "Accept-Language";
}
if (accept != null) {
Enumeration acceptHeaders = req.getHeaders(accept);
if (acceptHeaders != null)
if (acceptHeaders.hasMoreElements()) {
StringBuilder rv = new StringBuilder(
acceptHeaders.nextElement());
while (acceptHeaders.hasMoreElements()) {
rv.append(", ");
rv.append(acceptHeaders.nextElement());
}
retVal = rv.toString();
}
}
}
else if (nameParts[1].equals("CONNECTION")) {
retVal = req.getHeader("Connection");
}
else if (nameParts[1].equals("HOST")) {
retVal = req.getHeader("Host");
}
else if (nameParts[1].equals("REFERER")) {
retVal = req.getHeader("Referer");
}
else if (nameParts[1].equals("USER"))
if (nameParts.length == 3)
if (nameParts[2].equals("AGENT")) {
requiredParts = 3;
retVal = req.getHeader("User-Agent");
}
} else if (nameParts[0].equals("PATH")) {
if (nameParts[1].equals("INFO")) {
retVal = req.getPathInfo();
} else if (nameParts[1].equals("TRANSLATED")) {
retVal = req.getPathTranslated();
}
} else if (nameParts[0].equals("QUERY")) {
if (nameParts[1].equals("STRING")) {
String queryString = req.getQueryString();
if (nameParts.length == 2) {
//apache displays this as an empty string rather than (none)
retVal = nullToEmptyString(queryString);
} else if (nameParts[2].equals("UNESCAPED")) {
requiredParts = 3;
if (queryString != null) {
// Use default as a last resort
String queryStringEncoding =
Constants.DEFAULT_CHARACTER_ENCODING;
String uriEncoding = null;
boolean useBodyEncodingForURI = false;
// Get encoding settings from request / connector if
// possible
String requestEncoding = req.getCharacterEncoding();
if (req instanceof Request) {
uriEncoding =
((Request)req).getConnector().getURIEncoding();
useBodyEncodingForURI = ((Request)req)
.getConnector().getUseBodyEncodingForURI();
}
// If valid, apply settings from request / connector
if (uriEncoding != null) {
queryStringEncoding = uriEncoding;
} else if(useBodyEncodingForURI) {
if (requestEncoding != null) {
queryStringEncoding = requestEncoding;
}
}
try {
retVal = URLDecoder.decode(queryString,
queryStringEncoding);
} catch (UnsupportedEncodingException e) {
retVal = queryString;
}
}
}
}
} else if(nameParts[0].equals("REMOTE")) {
if (nameParts[1].equals("ADDR")) {
retVal = req.getRemoteAddr();
} else if (nameParts[1].equals("HOST")) {
retVal = req.getRemoteHost();
} else if (nameParts[1].equals("IDENT")) {
// Not implemented
} else if (nameParts[1].equals("PORT")) {
retVal = Integer.toString( req.getRemotePort());
} else if (nameParts[1].equals("USER")) {
retVal = req.getRemoteUser();
}
} else if(nameParts[0].equals("REQUEST")) {
if (nameParts[1].equals("METHOD")) {
retVal = req.getMethod();
}
else if (nameParts[1].equals("URI")) {
// If this is an error page, get the original URI
retVal = (String) req.getAttribute(
RequestDispatcher.FORWARD_REQUEST_URI);
if (retVal == null) retVal=req.getRequestURI();
}
} else if (nameParts[0].equals("SCRIPT")) {
String scriptName = req.getServletPath();
if (nameParts[1].equals("FILENAME")) {
retVal = context.getRealPath(scriptName);
}
else if (nameParts[1].equals("NAME")) {
retVal = scriptName;
}
} else if (nameParts[0].equals("SERVER")) {
if (nameParts[1].equals("ADDR")) {
retVal = req.getLocalAddr();
}
if (nameParts[1].equals("NAME")) {
retVal = req.getServerName();
} else if (nameParts[1].equals("PORT")) {
retVal = Integer.toString(req.getServerPort());
} else if (nameParts[1].equals("PROTOCOL")) {
retVal = req.getProtocol();
} else if (nameParts[1].equals("SOFTWARE")) {
StringBuilder rv = new StringBuilder(context.getServerInfo());
rv.append(" ");
rv.append(System.getProperty("java.vm.name"));
rv.append("/");
rv.append(System.getProperty("java.vm.version"));
rv.append(" ");
rv.append(System.getProperty("os.name"));
retVal = rv.toString();
}
} else if (name.equalsIgnoreCase("UNIQUE_ID")) {
retVal = req.getRequestedSessionId();
}
if (requiredParts != nameParts.length) return null;
return retVal;
}
@Override
public Date getCurrentDate() {
return new Date();
}
protected String nullToEmptyString(String string) {
String retVal = string;
if (retVal == null) {
retVal = "";
}
return retVal;
}
protected String getPathWithoutFileName(String servletPath) {
String retVal = null;
int lastSlash = servletPath.lastIndexOf('/');
if (lastSlash >= 0) {
//cut off file name
retVal = servletPath.substring(0, lastSlash + 1);
}
return retVal;
}
protected String getPathWithoutContext(final String contextPath,
final String servletPath) {
if (servletPath.startsWith(contextPath)) {
return servletPath.substring(contextPath.length());
}
return servletPath;
}
protected String getAbsolutePath(String path) throws IOException {
String pathWithoutContext = SSIServletRequestUtil.getRelativePath(req);
String prefix = getPathWithoutFileName(pathWithoutContext);
if (prefix == null) {
throw new IOException("Couldn't remove filename from path: "
+ pathWithoutContext);
}
String fullPath = prefix + path;
String retVal = RequestUtil.normalize(fullPath);
if (retVal == null) {
throw new IOException("Normalization yielded null on path: "
+ fullPath);
}
return retVal;
}
protected ServletContextAndPath getServletContextAndPathFromNonVirtualPath(
String nonVirtualPath) throws IOException {
if (nonVirtualPath.startsWith("/") || nonVirtualPath.startsWith("\\")) {
throw new IOException("A non-virtual path can't be absolute: "
+ nonVirtualPath);
}
if (nonVirtualPath.indexOf("../") >= 0) {
throw new IOException("A non-virtual path can't contain '../' : "
+ nonVirtualPath);
}
String path = getAbsolutePath(nonVirtualPath);
ServletContextAndPath csAndP = new ServletContextAndPath(
context, path);
return csAndP;
}
protected ServletContextAndPath getServletContextAndPathFromVirtualPath(
String virtualPath) throws IOException {
if (!virtualPath.startsWith("/") && !virtualPath.startsWith("\\")) {
return new ServletContextAndPath(context,
getAbsolutePath(virtualPath));
}
String normalized = RequestUtil.normalize(virtualPath);
if (isVirtualWebappRelative) {
return new ServletContextAndPath(context, normalized);
}
ServletContext normContext = context.getContext(normalized);
if (normContext == null) {
throw new IOException("Couldn't get context for path: "
+ normalized);
}
//If it's the root context, then there is no context element
// to remove,
// ie:
// '/file1.shtml' vs '/appName1/file1.shtml'
if (!isRootContext(normContext)) {
String noContext = getPathWithoutContext(
normContext.getContextPath(), normalized);
if (noContext == null) {
throw new IOException(
"Couldn't remove context from path: "
+ normalized);
}
return new ServletContextAndPath(normContext, noContext);
}
return new ServletContextAndPath(normContext, normalized);
}
//Assumes servletContext is not-null
//Assumes that identity comparison will be true for the same context
//Assuming the above, getContext("/") will be non-null as long as the root
// context is
// accessible.
//If it isn't, then servletContext can't be the root context anyway, hence
// they will
// not match.
protected boolean isRootContext(ServletContext servletContext) {
return servletContext == servletContext.getContext("/");
}
protected ServletContextAndPath getServletContextAndPath(
String originalPath, boolean virtual) throws IOException {
ServletContextAndPath csAndP = null;
if (debug > 0) {
log("SSIServletExternalResolver.getServletContextAndPath( "
+ originalPath + ", " + virtual + ")", null);
}
if (virtual) {
csAndP = getServletContextAndPathFromVirtualPath(originalPath);
} else {
csAndP = getServletContextAndPathFromNonVirtualPath(originalPath);
}
return csAndP;
}
protected URLConnection getURLConnection(String originalPath,
boolean virtual) throws IOException {
ServletContextAndPath csAndP = getServletContextAndPath(originalPath,
virtual);
ServletContext context = csAndP.getServletContext();
String path = csAndP.getPath();
URL url = context.getResource(path);
if (url == null) {
throw new IOException("Context did not contain resource: " + path);
}
URLConnection urlConnection = url.openConnection();
return urlConnection;
}
@Override
public long getFileLastModified(String path, boolean virtual)
throws IOException {
long lastModified = 0;
try {
URLConnection urlConnection = getURLConnection(path, virtual);
lastModified = urlConnection.getLastModified();
} catch (IOException e) {
// Ignore this. It will always fail for non-file based includes
}
return lastModified;
}
@Override
public long getFileSize(String path, boolean virtual) throws IOException {
long fileSize = -1;
try {
URLConnection urlConnection = getURLConnection(path, virtual);
fileSize = urlConnection.getContentLengthLong();
} catch (IOException e) {
// Ignore this. It will always fail for non-file based includes
}
return fileSize;
}
//We are making lots of unnecessary copies of the included data here. If
//someone ever complains that this is slow, we should connect the included
// stream to the print writer that SSICommand uses.
@Override
public String getFileText(String originalPath, boolean virtual)
throws IOException {
try {
ServletContextAndPath csAndP = getServletContextAndPath(
originalPath, virtual);
ServletContext context = csAndP.getServletContext();
String path = csAndP.getPath();
RequestDispatcher rd = context.getRequestDispatcher(path);
if (rd == null) {
throw new IOException(
"Couldn't get request dispatcher for path: " + path);
}
ByteArrayServletOutputStream basos =
new ByteArrayServletOutputStream();
ResponseIncludeWrapper responseIncludeWrapper =
new ResponseIncludeWrapper(context, req, res, basos);
rd.include(req, responseIncludeWrapper);
//We can't assume the included servlet flushed its output
responseIncludeWrapper.flushOutputStreamOrWriter();
byte[] bytes = basos.toByteArray();
//Assume platform default encoding unless otherwise specified
String retVal;
if (inputEncoding == null) {
retVal = new String( bytes );
} else {
retVal = new String (bytes,
B2CConverter.getCharset(inputEncoding));
}
//make an assumption that an empty response is a failure. This is
// a problem
// if a truly empty file
//were included, but not sure how else to tell.
if (retVal.equals("") && !req.getMethod().equalsIgnoreCase("HEAD")) {
throw new IOException("Couldn't find file: " + path);
}
return retVal;
} catch (ServletException e) {
throw new IOException("Couldn't include file: " + originalPath
+ " because of ServletException: " + e.getMessage());
}
}
protected static class ServletContextAndPath {
protected final ServletContext servletContext;
protected final String path;
public ServletContextAndPath(ServletContext servletContext,
String path) {
this.servletContext = servletContext;
this.path = path;
}
public ServletContext getServletContext() {
return servletContext;
}
public String getPath() {
return path;
}
}
}
