com.jdon.util.RequestUtil Maven / Gradle / Ivy
package com.jdon.util;
import java.net.URLEncoder;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* RequestUtil utility class Good ol' copy-n-paste from
* http://www.javaworld.com/javaworld/jw-02-2002/ssl/utilityclass.txt which
* is referenced in the following article:
* http://www.javaworld.com/javaworld/jw-02-2002/jw-0215-ssl.html
*/
public class RequestUtil {
private static final String STOWED_REQUEST_ATTRIBS = "ssl.redirect.attrib.stowed";
private static final String JDON_AUTOLOGIN_COOKIE = "jdon.autologin";
// "Tweakable" parameters for the cookie password encoding. NOTE: changing
// these and recompiling this class will essentially invalidate old cookies.
private final static int ENCODE_XORMASK = 0x5A;
private final static char ENCODE_DELIMETER = '\002';
private final static char ENCODE_CHAR_OFFSET1 = 'A';
private final static char ENCODE_CHAR_OFFSET2 = 'h';
/**
* Creates query String from request body parameters
*/
public static String getRequestParameters(HttpServletRequest aRequest) {
// set the ALGORIGTHM as defined for the application
// ALGORITHM = (String) aRequest.getAttribute(Constants.ENC_ALGORITHM);
Map m = aRequest.getParameterMap();
return createQueryStringFromMap(m, "&").toString();
}
/**
* Builds a query string from a given map of parameters
*
* @param m
* A map of parameters
* @param ampersand
* String to use for ampersands (e.g. "&" or "&" )
*
* @return query string (with no leading "?")
*/
public static StringBuilder createQueryStringFromMap(Map m, String ampersand) {
StringBuilder aReturn = new StringBuilder("");
Set aEntryS = m.entrySet();
Iterator aEntryI = aEntryS.iterator();
while (aEntryI.hasNext()) {
Map.Entry aEntry = (Map.Entry) aEntryI.next();
Object o = aEntry.getValue();
if (o == null) {
append(aEntry.getKey(), "", aReturn, ampersand);
} else if (o instanceof String) {
append(aEntry.getKey(), o, aReturn, ampersand);
} else if (o instanceof String[]) {
String[] aValues = (String[]) o;
for (int i = 0; i < aValues.length; i++) {
append(aEntry.getKey(), aValues[i], aReturn, ampersand);
}
} else {
append(aEntry.getKey(), o, aReturn, ampersand);
}
}
return aReturn;
}
/**
* Appends new key and value pair to query string
*
* @param key
* parameter name
* @param value
* value of parameter
* @param queryString
* existing query string
* @param ampersand
* string to use for ampersand (e.g. "&" or "&")
*
* @return query string (with no leading "?")
*/
private static StringBuilder append(Object key, Object value, StringBuilder queryString, String ampersand) {
if (queryString.length() > 0) {
queryString.append(ampersand);
}
// Use encodeURL from Struts' RequestUtils class - it's JDK 1.3 and 1.4
// compliant
queryString.append(encodeURL(key.toString()));
queryString.append("=");
queryString.append(encodeURL(value.toString()));
return queryString;
}
/**
* Stores request attributes in session
*
* @param aRequest
* the current request
*/
public static void stowRequestAttributes(HttpServletRequest aRequest) {
if (aRequest.getSession().getAttribute(STOWED_REQUEST_ATTRIBS) != null) {
return;
}
Enumeration e = aRequest.getAttributeNames();
Map map = new HashMap();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
map.put(name, aRequest.getAttribute(name));
}
aRequest.getSession().setAttribute(STOWED_REQUEST_ATTRIBS, map);
}
/**
* Returns request attributes from session to request
*
* @param aRequest
* DOCUMENT ME!
*/
public static void reclaimRequestAttributes(HttpServletRequest aRequest) {
Map map = (Map) aRequest.getSession().getAttribute(STOWED_REQUEST_ATTRIBS);
if (map == null) {
return;
}
Iterator itr = map.keySet().iterator();
while (itr.hasNext()) {
String name = (String) itr.next();
aRequest.setAttribute(name, map.get(name));
}
aRequest.getSession().removeAttribute(STOWED_REQUEST_ATTRIBS);
}
public static void saveAuthCookie(HttpServletResponse response, String username, String password) {
// Save the cookie value for 1 month
setCookie(response, JDON_AUTOLOGIN_COOKIE, encodePasswordCookie(username, password), "/");
}
public static String[] getAuthCookie(HttpServletRequest request) {
Cookie cookie = getCookie(request, JDON_AUTOLOGIN_COOKIE);
String[] values = null;
if (cookie != null) {
try {
values = decodePasswordCookie(cookie.getValue());
} catch (Exception e) {
System.err.print("getAuthCookie() err:" + e);
}
}
return values;
}
/**
* Convenience method to set a cookie
*
* @param response
* @param name
* @param value
* @param path
* @return HttpServletResponse
*/
public static void setCookie(HttpServletResponse response, String name, String value, String path) {
Cookie cookie = new Cookie(name, value);
cookie.setSecure(false);
cookie.setPath(path);
cookie.setMaxAge(3600 * 24 * 30); // 30 days
response.addCookie(cookie);
}
/**
* Convenience method to get a cookie by name
*
* @param request
* the current request
* @param name
* the name of the cookie to find
*
* @return the cookie (if found), null if not found
*/
public static Cookie getCookie(HttpServletRequest request, String name) {
Cookie[] cookies = request.getCookies();
Cookie returnCookie = null;
if (cookies == null) {
return returnCookie;
}
for (int i = 0; i < cookies.length; i++) {
Cookie thisCookie = cookies[i];
if (thisCookie.getName().equals(name)) {
// cookies with no value do me no good!
if (!thisCookie.getValue().equals("")) {
returnCookie = thisCookie;
break;
}
}
}
return returnCookie;
}
/**
* Convenience method for deleting a cookie by name
*
* @param response
* the current web response
* @param cookie
* the cookie to delete
*
* @return the modified response
*/
public static void deleteCookie(HttpServletResponse response, Cookie cookie, String path) {
if (cookie != null) {
// Delete the cookie by setting its maximum age to zero
cookie.setMaxAge(0);
cookie.setPath(path);
response.addCookie(cookie);
}
}
/**
* Convenience method to get the application's URL based on request
* variables.
*/
public static String getAppURL(HttpServletRequest request) {
StringBuffer url = new StringBuffer();
int port = request.getServerPort();
if (port < 0) {
port = 80; // Work around java.net.URL bug
}
String scheme = request.getScheme();
url.append(scheme);
url.append("://");
url.append(request.getServerName());
if ((scheme.equals("http") && (port != 80)) || (scheme.equals("https") && (port != 443))) {
url.append(':');
url.append(port);
}
return url.toString();
}
public static String encodeURL(String url) {
return encodeURL(url, "UTF-8");
}
/**
* Use the new URLEncoder.encode() method from Java 1.4 if available, else
* use the old deprecated version. This method uses reflection to find the
* appropriate method; if the reflection operations throw exceptions, this
* will return the url encoded with the old URLEncoder.encode() method.
*
* @param enc
* The character encoding the urlencode is performed on.
* @return String The encoded url.
*/
public static String encodeURL(String url, String enc) {
try {
if (enc == null || enc.length() == 0) {
enc = "UTF-8";
}
return URLEncoder.encode(url, enc);
} catch (Exception e) {
System.err.print(e);
}
return null;
}
/**
* Builds a cookie string containing a username and password.
*
*
* Note: with open source this is not really secure, but it prevents users
* from snooping the cookie file of others and by changing the XOR mask and
* character offsets, you can easily tweak results.
*
* @param username
* The username.
* @param password
* The password.
* @return String encoding the input parameters, an empty string if one of
* the arguments equals null.
*/
private static String encodePasswordCookie(String username, String password) {
StringBuffer buf = new StringBuffer();
if (username != null && password != null) {
byte[] bytes = (username + ENCODE_DELIMETER + password).getBytes();
int b;
for (int n = 0; n < bytes.length; n++) {
b = bytes[n] ^ (ENCODE_XORMASK + n);
buf.append((char) (ENCODE_CHAR_OFFSET1 + (b & 0x0F)));
buf.append((char) (ENCODE_CHAR_OFFSET2 + ((b >> 4) & 0x0F)));
}
}
return buf.toString();
}
/**
* Unrafels a cookie string containing a username and password.
*
* @param value
* The cookie value.
* @return String[] containing the username at index 0 and the password at
* index 1, or { null, null } if cookieVal equals
* null or the empty string.
*/
private static String[] decodePasswordCookie(String cookieVal) {
// check that the cookie value isn't null or zero-length
if (cookieVal == null || cookieVal.length() <= 0) {
return null;
}
// unrafel the cookie value
char[] chars = cookieVal.toCharArray();
byte[] bytes = new byte[chars.length / 2];
int b;
for (int n = 0, m = 0; n < bytes.length; n++) {
b = chars[m++] - ENCODE_CHAR_OFFSET1;
b |= (chars[m++] - ENCODE_CHAR_OFFSET2) << 4;
bytes[n] = (byte) (b ^ (ENCODE_XORMASK + n));
}
cookieVal = new String(bytes);
int pos = cookieVal.indexOf(ENCODE_DELIMETER);
String username = (pos < 0) ? "" : cookieVal.substring(0, pos);
String password = (pos < 0) ? "" : cookieVal.substring(pos + 1);
return new String[] { username, password };
}
}