/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.util;
import org.opencms.flex.CmsFlexRequest;
import org.opencms.i18n.CmsEncoder;
import org.opencms.json.JSONArray;
import org.opencms.json.JSONException;
import org.opencms.json.JSONObject;
import org.opencms.jsp.CmsJspActionElement;
import org.opencms.main.CmsLog;
import org.opencms.main.OpenCms;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.logging.Log;
/**
* Provides utility functions for dealing with values a <code>{@link HttpServletRequest}</code>.<p>
*
* @since 6.0.0
*/
public final class CmsRequestUtil {
/** Request attribute that contains the original error code. */
public static final String ATTRIBUTE_ERRORCODE = "org.opencms.util.CmsErrorCode";
/** HTTP Accept Header for the cms:device-tag. */
public static final String HEADER_ACCEPT = "Accept";
/** HTTP Accept-Charset Header for internal requests used during static export. */
public static final String HEADER_ACCEPT_CHARSET = "Accept-Charset";
/** HTTP Accept-Language Header for internal requests used during static export. */
public static final String HEADER_ACCEPT_LANGUAGE = "Accept-Language";
/** HTTP Header "Cache-Control". */
public static final String HEADER_CACHE_CONTROL = "Cache-Control";
/** HTTP Header "Connection". */
public static final String HEADER_CONNECTION = "Connection";
/** The "Content-Disposition" http header. */
public static final String HEADER_CONTENT_DISPOSITION = "Content-Disposition";
/** The "Content-Type" http header. */
public static final String HEADER_CONTENT_TYPE = "Content-Type";
/** HTTP Header "Expires". */
public static final String HEADER_EXPIRES = "Expires";
/** HTTP Header "If-Modified-Since". */
public static final String HEADER_IF_MODIFIED_SINCE = "If-Modified-Since";
/** The Header that stores the session id (used by OpenCms upload applet). */
public static final String HEADER_JSESSIONID = "JSESSIONID";
/** HTTP Header "Last-Modified". */
public static final String HEADER_LAST_MODIFIED = "Last-Modified";
/** HTTP Header "Location". */
public static final String HEADER_LOCATION = "Location";
/** HTTP Header for internal requests used during static export. */
public static final String HEADER_OPENCMS_EXPORT = "OpenCms-Export";
/** HTTP Header "Pragma". */
public static final String HEADER_PRAGMA = "Pragma";
/** HTTP Header "Server". */
public static final String HEADER_SERVER = "Server";
/** HTTP Header "user-agent". */
public static final String HEADER_USER_AGENT = "user-agent";
/** HTTP Header value "max-age=" (for "Cache-Control"). */
public static final String HEADER_VALUE_MAX_AGE = "max-age=";
/** HTTP Header value "must-revalidate" (for "Cache-Control"). */
public static final String HEADER_VALUE_MUST_REVALIDATE = "must-revalidate";
/** HTTP Header value "no-cache" (for "Cache-Control"). */
public static final String HEADER_VALUE_NO_CACHE = "no-cache";
/** HTTP Header "WWW-Authenticate". */
public static final String HEADER_WWW_AUTHENTICATE = "WWW-Authenticate";
/** Identifier for x-forwarded-for (i.e. proxied) request headers. */
public static final String HEADER_X_FORWARDED_FOR = "x-forwarded-for";
/** Assignment char between parameter name and values. */
public static final String PARAMETER_ASSIGNMENT = "=";
/** Delimiter char between parameters. */
public static final String PARAMETER_DELIMITER = "&";
/** Delimiter char between url and query. */
public static final String URL_DELIMITER = "?";
/** The prefix for &. */
private static final String AMP = "amp;";
/** The log object for this class. */
private static final Log LOG = CmsLog.getLog(CmsRequestUtil.class);
/**
* Default constructor (empty), private because this class has only
* static methods.<p>
*/
private CmsRequestUtil() {
// empty
}
/**
* Appends a request parameter to the given URL.<p>
*
* This method takes care about the adding the parameter as an additional
* parameter (appending <code>¶m=value</code>) or as the first parameter
* (appending <code>?param=value</code>).<p>
*
* @param url the URL where to append the parameter to
* @param paramName the paramter name to append
* @param paramValue the parameter value to append
*
* @return the URL with the given parameter appended
*/
public static String appendParameter(String url, String paramName, String paramValue) {
if (CmsStringUtil.isEmpty(url)) {
return null;
}
int pos = url.indexOf(URL_DELIMITER);
StringBuffer result = new StringBuffer(256);
result.append(url);
if (pos >= 0) {
// url already has parameters
result.append(PARAMETER_DELIMITER);
} else {
// url does not have parameters
result.append(URL_DELIMITER);
}
result.append(paramName);
result.append(PARAMETER_ASSIGNMENT);
result.append(paramValue);
return result.toString();
}
/**
* Appends a map of request parameters to the given URL.<p>
*
* The map can contains values of <code>String[]</code> or
* simple <code>String</code> values.<p>
*
* This method takes care about the adding the parameter as an additional
* parameter (appending <code>¶m=value</code>) or as the first parameter
* (appending <code>?param=value</code>).<p>
*
* @param url the URL where to append the parameter to
* @param params the parameters to append
* @param encode if <code>true</code>, the parameter values are encoded before they are appended
*
* @return the URL with the given parameter appended
*/
public static String appendParameters(String url, Map<String, String[]> params, boolean encode) {
if (CmsStringUtil.isEmpty(url)) {
return null;
}
if ((params == null) || params.isEmpty()) {
return url;
}
int pos = url.indexOf(URL_DELIMITER);
StringBuffer result = new StringBuffer(256);
result.append(url);
if (pos >= 0) {
// url already has parameters
result.append(PARAMETER_DELIMITER);
} else {
// url does not have parameters
result.append(URL_DELIMITER);
}
// ensure all values are of type String[]
Iterator<Map.Entry<String, String[]>> i = params.entrySet().iterator();
while (i.hasNext()) {
Map.Entry<String, String[]> entry = i.next();
String key = entry.getKey();
Object value = entry.getValue();
// generics where added later, so make sure that the value really is a String[]
String[] values = value instanceof String[] ? (String[])value : new String[] {value.toString()};
for (int j = 0; j < values.length; j++) {
String strValue = values[j];
if (encode) {
strValue = CmsEncoder.encode(strValue);
}
result.append(key);
result.append(PARAMETER_ASSIGNMENT);
result.append(strValue);
if ((j + 1) < values.length) {
result.append(PARAMETER_DELIMITER);
}
}
if (i.hasNext()) {
result.append(PARAMETER_DELIMITER);
}
}
return result.toString();
}
/**
* Creates a valid request parameter map from the given map,
* most notably changing the values form <code>String</code>
* to <code>String[]</code> if required.<p>
*
* If the given parameter map is <code>null</code>, then <code>null</code> is returned.<p>
*
* @param params the map of parameters to create a parameter map from
* @return the created parameter map, all values will be instances of <code>String[]</code>
*/
public static Map<String, String[]> createParameterMap(Map<String, ?> params) {
if (params == null) {
return null;
}
Map<String, String[]> result = new HashMap<String, String[]>();
Iterator<?> i = params.entrySet().iterator();
while (i.hasNext()) {
@SuppressWarnings("unchecked")
Map.Entry<String, ?> entry = (Entry<String, ?>)i.next();
String key = entry.getKey();
Object values = entry.getValue();
if (values instanceof String[]) {
result.put(key, (String[])values);
} else {
if (values != null) {
result.put(key, new String[] {values.toString()});
}
}
}
return result;
}
/**
* Parses the parameters of the given request query part and creates a parameter map out of them.<p>
*
* Please note: This does not parse a full request URI/URL, only the query part that
* starts after the "?". For example, in the URI <code>/system/index.html?a=b&c=d</code>,
* the query part is <code>a=b&c=d</code>.<p>
*
* If the given String is empty, an empty map is returned.<p>
*
* @param query the query to parse
* @return the parameter map created from the query
*/
public static Map<String, String[]> createParameterMap(String query) {
if (CmsStringUtil.isEmpty(query)) {
// empty query
return new HashMap<String, String[]>();
}
if (query.charAt(0) == URL_DELIMITER.charAt(0)) {
// remove leading '?' if required
query = query.substring(1);
}
// cut along the different parameters
String[] params = CmsStringUtil.splitAsArray(query, PARAMETER_DELIMITER);
Map<String, String[]> parameters = new HashMap<String, String[]>(params.length);
for (int i = 0; i < params.length; i++) {
String key = null;
String value = null;
// get key and value, separated by a '='
int pos = params[i].indexOf(PARAMETER_ASSIGNMENT);
if (pos > 0) {
key = params[i].substring(0, pos);
value = params[i].substring(pos + 1);
} else if (pos < 0) {
key = params[i];
value = "";
}
// adjust the key if it starts with "amp;"
// this happens when "&" is used instead of a simple "&"
if ((key != null) && (key.startsWith(AMP))) {
key = key.substring(AMP.length());
}
// now make sure the values are of type String[]
if (key != null) {
String[] values = parameters.get(key);
if (values == null) {
// this is the first value, create new array
values = new String[] {value};
} else {
// append to the existing value array
String[] copy = new String[values.length + 1];
System.arraycopy(values, 0, copy, 0, values.length);
copy[copy.length - 1] = value;
values = copy;
}
parameters.put(key, values);
}
}
return parameters;
}
/**
* Returns all parameters of the given request
* as a request parameter URL String, that is in the form <code>key1=value1&key2=value2</code> etc.
*
* The result will be encoded using the <code>{@link CmsEncoder#encode(String)}</code> function.<p>
*
* @param req the request to read the parameters from
*
* @return all initialized parameters of the given request as request parameter URL String
*/
public static String encodeParams(HttpServletRequest req) {
StringBuffer result = new StringBuffer(512);
Map<String, String[]> params = CmsCollectionsGenericWrapper.map(req.getParameterMap());
Iterator<Map.Entry<String, String[]>> i = params.entrySet().iterator();
while (i.hasNext()) {
Map.Entry<String, String[]> entry = i.next();
String param = entry.getKey();
String[] values = entry.getValue();
for (int j = 0; j < values.length; j++) {
result.append(param);
result.append("=");
result.append(CmsEncoder.encode(values[j]));
if ((j + 1) < values.length) {
result.append("&");
}
}
if (i.hasNext()) {
result.append("&");
}
}
return CmsEncoder.encode(result.toString());
}
/**
* Encodes the given URI, with all parameters from the given request appended.<p>
*
* The result will be encoded using the <code>{@link CmsEncoder#encode(String)}</code> function.<p>
*
* @param req the request where to read the parameters from
* @param uri the URI to encode
* @return the encoded URI, with all parameters from the given request appended
*/
public static String encodeParamsWithUri(String uri, HttpServletRequest req) {
String result;
String params = encodeParams(req);
if (CmsStringUtil.isNotEmpty(params)) {
result = CmsEncoder.encode(uri + "?") + params;
} else {
result = CmsEncoder.encode(uri);
}
return result;
}
/**
* Forwards the response to the given target, which may contain parameters appended like for example <code>?a=b&c=d</code>.<p>
*
* Please note: If possible, use <code>{@link #forwardRequest(String, Map, HttpServletRequest, HttpServletResponse)}</code>
* where the parameters are passed as a map, since the parsing of the parameters may introduce issues with encoding
* and is in general much less effective.<p>
*
* The parsing of parameters will likely fail for "large values" (e.g. full blown web forms with <textarea>
* elements etc. Use this method only if you know that the target will just contain up to 3 parameters which
* are relatively short and have no encoding or line break issues.<p>
*
* @param target the target to forward to (may contain parameters like <code>?a=b&c=d</code>)
* @param req the request to forward
* @param res the response to forward
*
* @throws IOException in case the forwarding fails
* @throws ServletException in case the forwarding fails
*/
public static void forwardRequest(String target, HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
// clear the current parameters
CmsUriSplitter uri = new CmsUriSplitter(target);
Map<String, String[]> params = createParameterMap(uri.getQuery());
forwardRequest(uri.getPrefix(), params, req, res);
}
/**
* Forwards the response to the given target, with the provided parameter map.<p>
*
* The target URI must NOT have parameters appended like for example <code>?a=b&c=d</code>.
* The values in the provided map must be of type <code>String[]</code>. If required, use
* <code>{@link #createParameterMap(Map)}</code> before calling this method to make sure
* all values are actually of the required array type.<p>
*
* @param target the target to forward to (may NOT contain parameters like <code>?a=b&c=d</code>)
* @param params the parameter map (the values must be of type <code>String[]</code>
* @param req the request to forward
* @param res the response to forward
*
* @throws IOException in case the forwarding fails
* @throws ServletException in case the forwarding fails
*/
public static void forwardRequest(
String target,
Map<String, String[]> params,
HttpServletRequest req,
HttpServletResponse res) throws IOException, ServletException {
// cast the request back to a flex request so the parameter map can be accessed
CmsFlexRequest f_req = (CmsFlexRequest)req;
// set the parameters
f_req.setParameterMap(params);
// check for links "into" OpenCms, these may need the webapp name to be removed
String vfsPrefix = OpenCms.getStaticExportManager().getVfsPrefix();
if (target.startsWith(vfsPrefix)) {
// remove VFS prefix (will also work for empty vfs prefix in ROOT webapp case with proxy rules)
target = target.substring(vfsPrefix.length());
// append the servlet name
target = OpenCms.getSystemInfo().getServletPath() + target;
}
// forward the request
f_req.getRequestDispatcher(target).forward(f_req, res);
}
/**
* Returns a map with all request attributes.<p>
*
* @param req the request
*
* @return the attribute map
*/
public static Map<String, Object> getAtrributeMap(ServletRequest req) {
if (req instanceof CmsFlexRequest) {
return ((CmsFlexRequest)req).getAttributeMap();
}
Map<String, Object> attrs = new HashMap<String, Object>();
Enumeration<String> atrrEnum = CmsCollectionsGenericWrapper.enumeration(req.getAttributeNames());
while (atrrEnum.hasMoreElements()) {
String key = atrrEnum.nextElement();
Object value = req.getAttribute(key);
attrs.put(key, value);
}
return attrs;
}
/**
* Returns the value of the cookie with the given name.<p/>
*
* @param jsp the CmsJspActionElement to use
* @param name the name of the cookie
*
* @return the value of the cookie with the given name or null, if no cookie exists with the name
*/
public static String getCookieValue(CmsJspActionElement jsp, String name) {
Cookie[] cookies = jsp.getRequest().getCookies();
for (int i = 0; (cookies != null) && (i < cookies.length); i++) {
if (name.equalsIgnoreCase(cookies[i].getName())) {
return cookies[i].getValue();
}
}
return null;
}
/**
* Converts the given parameter map into an JSON object.<p>
*
* @param params the parameters map to convert
*
* @return the JSON representation of the given parameter map
*/
public static JSONObject getJsonParameterMap(Map<String, String[]> params) {
JSONObject result = new JSONObject();
for (Map.Entry<String, String[]> entry : params.entrySet()) {
String paramKey = entry.getKey();
JSONArray paramValue = new JSONArray();
for (int i = 0, l = entry.getValue().length; i < l; i++) {
paramValue.put(entry.getValue()[i]);
}
try {
result.putOpt(paramKey, paramValue);
} catch (JSONException e) {
// should never happen
LOG.warn(e.getLocalizedMessage(), e);
}
}
return result;
}
/**
* Reads value from the request parameters,
* will return <code>null</code> if the value is not available or only white space.<p>
*
* The value of the request will also be decoded using <code>{@link CmsEncoder#decode(String)}</code>
* and also trimmed using <code>{@link String#trim()}</code>.<p>
*
* @param request the request to read the parameter from
* @param paramName the parameter name to read
*
* @return the request parameter value for the given parameter
*/
public static String getNotEmptyDecodedParameter(HttpServletRequest request, String paramName) {
String result = getNotEmptyParameter(request, paramName);
if (result != null) {
result = CmsEncoder.decode(result.trim());
}
return result;
}
/**
* Reads value from the request parameters,
* will return <code>null</code> if the value is not available or only white space.<p>
*
* @param request the request to read the parameter from
* @param paramName the parameter name to read
*
* @return the request parameter value for the given parameter
*/
public static String getNotEmptyParameter(HttpServletRequest request, String paramName) {
String result = request.getParameter(paramName);
if (CmsStringUtil.isEmptyOrWhitespaceOnly(result)) {
result = null;
}
return result;
}
/**
* Converts the given JSON object into a valid parameter map.<p>
*
* @param params the JSON object to convert
*
* @return the parameter map from the given JSON object
*/
public static Map<String, String[]> getParameterMapFromJSON(JSONObject params) {
Map<String, String[]> result = new HashMap<String, String[]>();
Iterator<String> itKeys = params.keys();
while (itKeys.hasNext()) {
String key = itKeys.next();
JSONArray paramValue = params.optJSONArray(key);
result.put(key, new String[paramValue.length()]);
for (int i = 0, l = paramValue.length(); i < l; i++) {
result.get(key)[i] = paramValue.optString(i);
}
}
return result;
}
/**
* Returns the link without parameters from a String that is formatted for a GET request.<p>
*
* @param url the URL to remove the parameters from
* @return the URL without any parameters
*/
public static String getRequestLink(String url) {
if (CmsStringUtil.isEmpty(url)) {
return null;
}
int pos = url.indexOf(URL_DELIMITER);
if (pos >= 0) {
return url.substring(0, pos);
}
return url;
}
/**
* Reads an object from the session of the given HTTP request.<p>
*
* A session will be initialized if the request does not currently have a session.
* As a result, the request will always have a session after this method has been called.<p>
*
* Will return <code>null</code> if no corresponding object is found in the session.<p>
*
* @param request the request to get the session from
* @param key the key of the object to read from the session
* @return the object received form the session, or <code>null</code>
*/
public static Object getSessionValue(HttpServletRequest request, String key) {
HttpSession session = request.getSession(true);
return session.getAttribute(key);
}
/**
* Parses a request of the form <code>multipart/form-data</code>.
*
* The result list will contain items of type <code>{@link FileItem}</code>.
* If the request is not of type <code>multipart/form-data</code>, then <code>null</code> is returned.<p>
*
* @param request the HTTP servlet request to parse
*
* @return the list of <code>{@link FileItem}</code> extracted from the multipart request,
* or <code>null</code> if the request was not of type <code>multipart/form-data</code>
*/
public static List<FileItem> readMultipartFileItems(HttpServletRequest request) {
if (!ServletFileUpload.isMultipartContent(request)) {
return null;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(4096);
// the location for saving data that is larger than getSizeThreshold()
factory.setRepository(new File(OpenCms.getSystemInfo().getPackagesRfsPath()));
ServletFileUpload fu = new ServletFileUpload(factory);
// set encoding to correctly handle special chars (e.g. in filenames)
fu.setHeaderEncoding(request.getCharacterEncoding());
List<FileItem> result = new ArrayList<FileItem>();
try {
List<FileItem> items = CmsCollectionsGenericWrapper.list(fu.parseRequest(request));
if (items != null) {
result = items;
}
} catch (FileUploadException e) {
LOG.error(Messages.get().getBundle().key(Messages.LOG_PARSE_MULIPART_REQ_FAILED_0), e);
}
return result;
}
/**
* Creates a "standard" request parameter map from the values of a
* <code>multipart/form-data</code> request.<p>
*
* @param encoding the encoding to use when creating the values
* @param multiPartFileItems the list of parsed multi part file items
*
* @return a map containing all non-file request parameters
*
* @see #readMultipartFileItems(HttpServletRequest)
*/
public static Map<String, String[]> readParameterMapFromMultiPart(String encoding, List<FileItem> multiPartFileItems) {
Map<String, String[]> parameterMap = new HashMap<String, String[]>();
Iterator<FileItem> i = multiPartFileItems.iterator();
while (i.hasNext()) {
FileItem item = i.next();
String name = item.getFieldName();
String value = null;
if ((name != null) && (item.getName() == null)) {
// only put to map if current item is no file and not null
try {
value = item.getString(encoding);
} catch (UnsupportedEncodingException e) {
LOG.error(Messages.get().getBundle().key(Messages.LOG_ENC_MULTIPART_REQ_ERROR_0), e);
value = item.getString();
}
if (parameterMap.containsKey(name)) {
// append value to parameter values array
String[] oldValues = parameterMap.get(name);
String[] newValues = new String[oldValues.length + 1];
System.arraycopy(oldValues, 0, newValues, 0, oldValues.length);
newValues[oldValues.length] = value;
parameterMap.put(name, newValues);
} else {
parameterMap.put(name, new String[] {value});
}
}
}
return parameterMap;
}
/**
* Redirects the response to the target link using a "301 - Moved Permanently" header.<p>
*
* This implementation will work only on JSP pages in OpenCms that use the default JSP loader implementation.<p>
*
* @param jsp the OpenCms JSP context
* @param target the target link
*/
public static void redirectPermanently(CmsJspActionElement jsp, String target) {
String newTarget = OpenCms.getLinkManager().substituteLink(jsp.getCmsObject(), target, null, true);
jsp.getRequest().setAttribute(
CmsRequestUtil.ATTRIBUTE_ERRORCODE,
new Integer(HttpServletResponse.SC_MOVED_PERMANENTLY));
jsp.getResponse().setHeader(HEADER_CONNECTION, "close");
try {
jsp.getResponse().sendRedirect(newTarget);
} catch (IOException e) {
LOG.error(Messages.get().getBundle().key(Messages.ERR_IOERROR_0), e);
// In case of an IOException, we send the redirect ourselves
jsp.getResponse().setHeader(HEADER_LOCATION, newTarget);
}
}
/**
* Redirects the response to the target link.<p>
*
* Use this method instead of {@link javax.servlet.http.HttpServletResponse#sendRedirect(java.lang.String)}
* to avoid relative links with secure sites (and issues with apache).<p>
*
* @param jsp the OpenCms JSP context
* @param target the target link
*
* @throws IOException if something goes wrong during redirection
*/
public static void redirectRequestSecure(CmsJspActionElement jsp, String target) throws IOException {
jsp.getResponse().sendRedirect(OpenCms.getLinkManager().substituteLink(jsp.getCmsObject(), target, null, true));
}
/**
* Removes an object from the session of the given http request.<p>
*
* A session will be initialized if the request does not currently have a session.
* As a result, the request will always have a session after this method has been called.<p>
*
* @param request the request to get the session from
* @param key the key of the object to be removed from the session
*/
public static void removeSessionValue(HttpServletRequest request, String key) {
HttpSession session = request.getSession(true);
session.removeAttribute(key);
}
/**
* Sets the value of a specific cookie.<p>
* If no cookie exists with the value, a new cookie will be created.
*
* @param jsp the CmsJspActionElement to use
* @param name the name of the cookie
* @param value the value of the cookie
*/
public static void setCookieValue(CmsJspActionElement jsp, String name, String value) {
Cookie[] cookies = jsp.getRequest().getCookies();
for (int i = 0; (cookies != null) && (i < cookies.length); i++) {
if (name.equalsIgnoreCase(cookies[i].getName())) {
cookies[i].setValue(value);
return;
}
}
Cookie cookie = new Cookie(name, value);
jsp.getResponse().addCookie(cookie);
}
/**
* Sets headers to the given response to prevent client side caching.<p>
*
* The following headers are set:<p>
* <code>
* Cache-Control: max-age=0<br>
* Cache-Control: must-revalidate<br>
* Pragma: no-cache
* </code>
*
* @param res the request where to set the no-cache headers
*/
public static void setNoCacheHeaders(HttpServletResponse res) {
res.setHeader(CmsRequestUtil.HEADER_CACHE_CONTROL, CmsRequestUtil.HEADER_VALUE_MAX_AGE + "0");
res.addHeader(CmsRequestUtil.HEADER_CACHE_CONTROL, CmsRequestUtil.HEADER_VALUE_MUST_REVALIDATE);
res.setHeader(CmsRequestUtil.HEADER_PRAGMA, CmsRequestUtil.HEADER_VALUE_NO_CACHE);
}
/**
* Adds an object to the session of the given HTTP request.<p>
*
* A session will be initialized if the request does not currently have a session.
* As a result, the request will always have a session after this method has been called.<p>
*
* @param request the request to get the session from
* @param key the key of the object to be stored in the session
* @param value the object to be stored in the session
*/
public static void setSessionValue(HttpServletRequest request, String key, Object value) {
HttpSession session = request.getSession(true);
session.setAttribute(key, value);
}
}