/*
* $Id$
*
* 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.struts2.util;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.util.LocalizedTextUtil;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import java.math.BigInteger;
import java.util.Map;
import java.util.Random;
/**
* TokenHelper
*
*/
public class TokenHelper {
/**
* The default namespace for storing token session values
*/
public static final String TOKEN_NAMESPACE = "struts.tokens";
/**
* The default name to map the token value
*/
public static final String DEFAULT_TOKEN_NAME = "token";
/**
* The name of the field which will hold the token name
*/
public static final String TOKEN_NAME_FIELD = "struts.token.name";
private static final Logger LOG = LoggerFactory.getLogger(TokenHelper.class);
private static final Random RANDOM = new Random();
/**
* Sets a transaction token into the session using the default token name.
*
* @return the token string
*/
public static String setToken() {
return setToken(DEFAULT_TOKEN_NAME);
}
/**
* Sets a transaction token into the session based on the provided token name.
*
* @param tokenName the token name based on which a generated token value is stored into session; for actual session
* store, this name will be prefixed by a namespace.
*
* @return the token string
*/
public static String setToken( String tokenName ) {
String token = generateGUID();
setSessionToken(tokenName, token);
return token;
}
/**
* Put a given named token into the session map. The token will be stored with a namespace prefix prepended.
*
* @param tokenName the token name based on which given token value is stored into session; for actual session store,
* this name will be prefixed by a namespace.
* @param token the token value to store
*/
public static void setSessionToken( String tokenName, String token ) {
Map<String, Object> session = ActionContext.getContext().getSession();
try {
session.put(buildTokenSessionAttributeName(tokenName), token);
} catch ( IllegalStateException e ) {
// WW-1182 explain to user what the problem is
String msg = "Error creating HttpSession due response is commited to client. You can use the CreateSessionInterceptor or create the HttpSession from your action before the result is rendered to the client: " + e.getMessage();
if (LOG.isErrorEnabled()) {
LOG.error(msg, e);
}
throw new IllegalArgumentException(msg);
}
}
/**
* Build a name-spaced token session attribute name based on the given token name.
*
* @param tokenName the token name to prefix
*
* @return the name space prefixed session token name
*/
public static String buildTokenSessionAttributeName( String tokenName ) {
return TOKEN_NAMESPACE + "." + tokenName;
}
/**
* Gets a transaction token from the params in the ServletActionContext using the default token name.
*
* @return token
*/
public static String getToken() {
return getToken(DEFAULT_TOKEN_NAME);
}
/**
* Gets the Token value from the params in the ServletActionContext using the given name
*
* @param tokenName the name of the parameter which holds the token value
* @return the token String or null, if the token could not be found
*/
public static String getToken(String tokenName) {
if (tokenName == null ) {
return null;
}
Map params = ActionContext.getContext().getParameters();
String[] tokens = (String[]) params.get(tokenName);
String token;
if ((tokens == null) || (tokens.length < 1)) {
if (LOG.isWarnEnabled()) {
LOG.warn("Could not find token mapped to token name " + tokenName);
}
return null;
}
token = tokens[0];
return token;
}
/**
* Gets the token name from the Parameters in the ServletActionContext
*
* @return the token name found in the params, or null if it could not be found
*/
public static String getTokenName() {
Map params = ActionContext.getContext().getParameters();
if (!params.containsKey(TOKEN_NAME_FIELD)) {
if (LOG.isWarnEnabled()) {
LOG.warn("Could not find token name in params.");
}
return null;
}
String[] tokenNames = (String[]) params.get(TOKEN_NAME_FIELD);
String tokenName;
if ((tokenNames == null) || (tokenNames.length < 1)) {
if (LOG.isWarnEnabled()) {
LOG.warn("Got a null or empty token name.");
}
return null;
}
tokenName = tokenNames[0];
return tokenName;
}
/**
* Checks for a valid transaction token in the current request params. If a valid token is found, it is
* removed so the it is not valid again.
*
* @return false if there was no token set into the params (check by looking for {@link #TOKEN_NAME_FIELD}), true if a valid token is found
*/
public static boolean validToken() {
String tokenName = getTokenName();
if (tokenName == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("no token name found -> Invalid token ");
}
return false;
}
String token = getToken(tokenName);
if (token == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("no token found for token name "+tokenName+" -> Invalid token ");
}
return false;
}
Map session = ActionContext.getContext().getSession();
String tokenSessionName = buildTokenSessionAttributeName(tokenName);
String sessionToken = (String) session.get(tokenSessionName);
if (!token.equals(sessionToken)) {
if (LOG.isWarnEnabled()) {
LOG.warn(LocalizedTextUtil.findText(TokenHelper.class, "struts.internal.invalid.token", ActionContext.getContext().getLocale(), "Form token {0} does not match the session token {1}.", new Object[]{
token, sessionToken
}));
}
return false;
}
// remove the token so it won't be used again
session.remove(tokenSessionName);
return true;
}
public static String generateGUID() {
return new BigInteger(165, RANDOM).toString(36).toUpperCase();
}
}