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Jodd Servlet is set of web tools, including the nice tag library, wrappers and some filters.
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.servlet;
import jodd.core.JoddCore;
import jodd.io.FileNameUtil;
import jodd.io.StreamUtil;
import jodd.io.upload.FileUpload;
import jodd.servlet.upload.MultipartRequest;
import jodd.servlet.upload.MultipartRequestWrapper;
import jodd.util.Base64;
import jodd.util.StringPool;
import jodd.util.StringUtil;
import jodd.util.net.MimeTypes;
import jodd.util.net.URLCoder;
import javax.servlet.ServletContext;
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 javax.servlet.jsp.PageContext;
import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Enumeration;
/**
* Miscellaneous servlet utilities.
*/
public class ServletUtil {
public static final String HEADER_CONTENT_TYPE = "Content-Type";
public static final String TYPE_MULTIPART_FORM_DATA = "multipart/form-data";
public static final String HEADER_AUTHORIZATION = "Authorization";
public static final String HEADER_ACCEPT_ENCODING = "Accept-Encoding";
public static final String CONTENT_DISPOSITION = "Content-Disposition";
public static final String WWW_AUTHENTICATE = "WWW-Authenticate";
private static final String JAVAX_SERVLET_ERROR_EXCEPTION = "javax.servlet.error.exception";
private static final String SCOPE_APPLICATION = "application";
private static final String SCOPE_SESSION = "session";
private static final String SCOPE_REQUEST = "request";
private static final String SCOPE_PAGE = "page";
// ---------------------------------------------------------------- multi-part
/**
* Returns true if a request is multi-part request.
*/
public static boolean isMultipartRequest(final HttpServletRequest request) {
String type = request.getHeader(HEADER_CONTENT_TYPE);
return (type != null) && type.startsWith(TYPE_MULTIPART_FORM_DATA);
}
/**
* Returns true if client supports gzip encoding.
*/
public static boolean isGzipSupported(final HttpServletRequest request) {
String browserEncodings = request.getHeader(HEADER_ACCEPT_ENCODING);
return (browserEncodings != null) && (browserEncodings.contains("gzip"));
}
// ---------------------------------------------------------------- authorization
/**
* Decodes the "Authorization" header and retrieves the
* user's name from it. Returns null if the header is not present.
*/
public static String resolveAuthUsername(final HttpServletRequest request) {
String header = request.getHeader(HEADER_AUTHORIZATION);
if (header == null) {
return null;
}
String encoded = header.substring(header.indexOf(' ') + 1);
String decoded = new String(Base64.decode(encoded));
return decoded.substring(0, decoded.indexOf(':'));
}
/**
* Decodes the "Authorization" header and retrieves the
* password from it. Returns null if the header is not present.
*/
public static String resolveAuthPassword(final HttpServletRequest request) {
String header = request.getHeader(HEADER_AUTHORIZATION);
if (header == null) {
return null;
}
String encoded = header.substring(header.indexOf(' ') + 1);
String decoded = new String(Base64.decode(encoded));
return decoded.substring(decoded.indexOf(':') + 1);
}
/**
* Sends correct headers to require basic authentication for the given realm.
*/
public static void requireAuthentication(final HttpServletResponse resp, final String realm) throws IOException {
resp.setHeader(WWW_AUTHENTICATE, "Basic realm=\"" + realm + '\"');
resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
}
// ---------------------------------------------------------------- download and content disposition
/**
* Prepares response for file download. Mime type and size is resolved from the file.
*/
public static void prepareDownload(final HttpServletResponse response, final File file) {
prepareDownload(response, file, null);
}
/**
* Prepares response for file download with provided mime type.
*/
public static void prepareDownload(final HttpServletResponse response, final File file, final String mimeType) {
if (!file.exists()) {
throw new IllegalArgumentException("File not found: " + file);
}
if (file.length() > Integer.MAX_VALUE) {
throw new IllegalArgumentException("File too big: " + file);
}
prepareResponse(response, file.getAbsolutePath(), mimeType, (int) file.length());
}
/**
* Prepares response for various provided data.
*
* @param response http response
* @param fileName file name, if full path then file name will be stripped, if null, will be ignored.
* @param mimeType mime type with optional charset, may be null
* @param fileSize if less then 0 it will be ignored
*/
public static void prepareResponse(final HttpServletResponse response, final String fileName, String mimeType, final int fileSize) {
if ((mimeType == null) && (fileName != null)) {
String extension = FileNameUtil.getExtension(fileName);
mimeType = MimeTypes.getMimeType(extension);
}
if (mimeType != null) {
response.setContentType(mimeType);
}
if (fileSize >= 0) {
response.setContentLength(fileSize);
}
// support internationalization
// See https://tools.ietf.org/html/rfc6266#section-5 for more information.
if (fileName != null) {
String name = FileNameUtil.getName(fileName);
String encodedFileName = URLCoder.encode(name);
response.setHeader(CONTENT_DISPOSITION,
"attachment;filename=\"" + name + "\";filename*=utf8''" + encodedFileName);
}
}
// ---------------------------------------------------------------- cookie
/**
* Finds and returns cookie from client by its name.
* Only the first cookie is returned.
* @see #getAllCookies(javax.servlet.http.HttpServletRequest, String)
* @return cookie value or null if cookie with specified name doesn't exist.
*/
public static Cookie getCookie(final HttpServletRequest request, final String cookieName) {
Cookie[] cookies = request.getCookies();
if (cookies != null) {
for (Cookie cookie : cookies) {
if (cookie.getName().equals(cookieName)) {
return cookie;
}
}
}
return null;
}
/**
* Returns all cookies from client that matches provided name.
* @see #getCookie(javax.servlet.http.HttpServletRequest, String)
*/
public static Cookie[] getAllCookies(final HttpServletRequest request, final String cookieName) {
Cookie[] cookies = request.getCookies();
if (cookies == null) {
return null;
}
ArrayList list = new ArrayList<>(cookies.length);
for (Cookie cookie : cookies) {
if (cookie.getName().equals(cookieName)) {
list.add(cookie);
}
}
if (list.isEmpty()) {
return null;
}
return list.toArray(new Cookie[list.size()]);
}
// ---------------------------------------------------------------- request body
/**
* Reads HTTP request body using the request reader. Once body is read,
* it cannot be read again!
*/
public static String readRequestBodyFromReader(final HttpServletRequest request) throws IOException {
BufferedReader buff = request.getReader();
StringWriter out = new StringWriter();
StreamUtil.copy(buff, out);
return out.toString();
}
/**
* Reads HTTP request body using the request stream. Once body is read,
* it cannot be read again!
*/
public static String readRequestBodyFromStream(final HttpServletRequest request) throws IOException {
String charEncoding = request.getCharacterEncoding();
if (charEncoding == null) {
charEncoding = JoddCore.defaults().getEncoding();
}
CharArrayWriter charArrayWriter = new CharArrayWriter();
BufferedReader bufferedReader = null;
try {
InputStream inputStream = request.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream, charEncoding));
StreamUtil.copy(bufferedReader, charArrayWriter);
} else {
return StringPool.EMPTY;
}
} finally {
StreamUtil.close(bufferedReader);
}
return charArrayWriter.toString();
}
// ---------------------------------------------------------------- context path
/**
* Returns correct context path, as by Servlet definition. Different
* application servers return all variants: "", null, "/".
*
* The context path always comes first in a request URI. The path
* starts with a "/" character but does not end with a "/" character.
* For servlets in the default (root) context, this method returns "".
*/
public static String getContextPath(final HttpServletRequest request) {
String contextPath = request.getContextPath();
if (contextPath == null || contextPath.equals(StringPool.SLASH)) {
contextPath = StringPool.EMPTY;
}
return contextPath;
}
/**
* Returns correct context path, as by Servlet definition. Different
* application servers return all variants: "", null, "/".
*
* The context path always comes first in a request URI. The path
* starts with a "/" character but does not end with a "/" character.
* For servlets in the default (root) context, this method returns "".
*/
public static String getContextPath(final ServletContext servletContext) {
String contextPath = servletContext.getContextPath();
if (contextPath == null || contextPath.equals(StringPool.SLASH)) {
contextPath = StringPool.EMPTY;
}
return contextPath;
}
/**
* @see #getContextPath(javax.servlet.ServletContext)
*/
public static String getContextPath(final PageContext pageContext) {
return getContextPath(pageContext.getServletContext());
}
/**
* Stores context path in server context and request scope.
*/
public static void storeContextPath(final PageContext pageContext, final String contextPathVariableName) {
String ctxPath = getContextPath(pageContext);
HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
request.setAttribute(contextPathVariableName, ctxPath);
ServletContext servletContext = pageContext.getServletContext();
servletContext.setAttribute(contextPathVariableName, ctxPath);
}
/**
* Stores context path in page context and request scope.
*/
public static void storeContextPath(final ServletContext servletContext, final String contextPathVariableName) {
String ctxPath = getContextPath(servletContext);
servletContext.setAttribute(contextPathVariableName, ctxPath);
}
// ---------------------------------------------------------------- attributes and values
/**
* Returns non-null attribute value. Scopes are examined in the
* following order: page, request, session, application.
*/
public static Object attribute(final PageContext pageContext, final String name) {
Object value = pageContext.getAttribute(name);
if (value != null) {
return value;
}
return attribute((HttpServletRequest) pageContext.getRequest(), name);
}
/**
* Returns non-null attribute value. Scopes are examined in the
* following order: request, session, application.
*/
public static Object attribute(final HttpServletRequest request, final String name) {
Object value = request.getAttribute(name);
if (value != null) {
return value;
}
value = request.getSession().getAttribute(name);
if (value != null) {
return value;
}
return request.getSession().getServletContext().getAttribute(name);
}
/**
* Returns value of property/attribute. The following value sets are looked up:
*
* - page context attributes
* - request attributes
* - request parameters (multi-part request detected)
* - session attributes
* - context attributes
*
*/
public static Object value(final PageContext pageContext, final String name) {
Object value = pageContext.getAttribute(name);
if (value != null) {
return value;
}
return value((HttpServletRequest) pageContext.getRequest(), name);
}
/**
* Returns value of property/attribute. The following value sets are looked up:
*
* - request attributes
* - request parameters (multi-part request detected)
* - session attributes
* - context attributes
*
*/
public static Object value(final HttpServletRequest request, final String name) {
Object value = request.getAttribute(name);
if (value != null) {
return value;
}
if (isMultipartRequest(request)) {
try {
MultipartRequest multipartRequest = MultipartRequest.getInstance(request);
value = multipartRequest.getParameter(name);
} catch (IOException ignore) {
}
}
else {
String[] params = request.getParameterValues(name);
if (params != null) {
if (params.length == 1) {
value = params[0];
} else {
value = params;
}
}
}
if (value != null) {
return value;
}
value = request.getSession().getAttribute(name);
if (value != null) {
return value;
}
return request.getSession().getServletContext().getAttribute(name);
}
// ---------------------------------------------------------------- scope attributes
/**
* Sets scope attribute.
*/
public static void setScopeAttribute(final String name, final Object value, final String scope, final PageContext pageContext) {
HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
String scopeValue = scope != null ? scope.toLowerCase() : SCOPE_PAGE;
if (scopeValue.equals(SCOPE_PAGE)) {
pageContext.setAttribute(name, value);
}
else if (scopeValue.equals(SCOPE_REQUEST)) {
request.setAttribute(name, value);
}
else if (scopeValue.equals(SCOPE_SESSION)) {
request.getSession().setAttribute(name, value);
}
else if (scopeValue.equals(SCOPE_APPLICATION)) {
request.getSession().getServletContext().setAttribute(name, value);
}
else {
throw new IllegalArgumentException("Invalid scope: " + scope);
}
}
/**
* Removes scope attribute.
*/
public static void removeScopeAttribute(final String name, final String scope, final PageContext pageContext) {
HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
String scopeValue = scope != null ? scope.toLowerCase() : SCOPE_PAGE;
if (scopeValue.equals(SCOPE_PAGE)) {
pageContext.removeAttribute(name);
}
else if (scopeValue.equals(SCOPE_REQUEST)) {
request.removeAttribute(name);
}
else if (scopeValue.equals(SCOPE_SESSION)) {
request.getSession().removeAttribute(name);
}
else if (scopeValue.equals(SCOPE_APPLICATION)) {
request.getSession().getServletContext().removeAttribute(name);
}
else {
throw new IllegalArgumentException("Invalid scope: " + scope);
}
}
// ---------------------------------------------------------------- resolve URL
/**
* Valid characters in a scheme, as specified by RFC 1738.
*/
public static final String VALID_SCHEME_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+.-";
/**
* Returns true if current URL is absolute, false otherwise.
*/
public static boolean isAbsoluteUrl(final String url) {
if (url == null) { // a null URL is not absolute
return false;
}
int colonPos; // fast simple check first
if ((colonPos = url.indexOf(':')) == -1) {
return false;
}
// if we DO have a colon, make sure that every character
// leading up to it is a valid scheme character
for (int i = 0; i < colonPos; i++) {
if (VALID_SCHEME_CHARS.indexOf(url.charAt(i)) == -1) {
return false;
}
}
return true;
}
/**
* Strips a servlet session ID from url. The session ID
* is encoded as a URL "path parameter" beginning with "jsessionid=".
* We thus remove anything we find between ";jsessionid=" (inclusive)
* and either EOS or a subsequent ';' (exclusive).
*/
public static String stripSessionId(final String url) {
StringBuilder u = new StringBuilder(url);
int sessionStart;
while ((sessionStart = u.toString().indexOf(";jsessionid=")) != -1) {
int sessionEnd = u.toString().indexOf(';', sessionStart + 1);
if (sessionEnd == -1) {
sessionEnd = u.toString().indexOf('?', sessionStart + 1);
}
if (sessionEnd == -1) {
sessionEnd = u.length();
}
u.delete(sessionStart, sessionEnd);
}
return u.toString();
}
public static String resolveUrl(final String url, final HttpServletRequest request) {
if (isAbsoluteUrl(url)) {
return url;
}
if (url.startsWith(StringPool.SLASH)) {
return getContextPath(request) + url;
} else {
return url;
}
}
public static String resolveUrl(final String url, final String context) {
if (isAbsoluteUrl(url)) {
return url;
}
if (!context.startsWith(StringPool.SLASH) || !url.startsWith(StringPool.SLASH)) {
throw new IllegalArgumentException("Values of both 'context' and 'url' must start with '/'.");
}
if (context.equals(StringPool.SLASH)) {
return url;
} else {
return (context + url);
}
}
// ---------------------------------------------------------------- params
/**
* Returns HTTP request parameter as String or String[].
*/
public static Object getRequestParameter(final ServletRequest request, final String name) {
String[] values = request.getParameterValues(name);
if (values == null) {
return null;
}
if (values.length == 1) {
return values[0];
}
return values;
}
/**
* Checks if some parameter is in GET parameters.
*/
public boolean isGetParameter(final HttpServletRequest request, String name) {
name = URLCoder.encodeQueryParam(name) + '=';
String query = request.getQueryString();
String[] nameValuePairs = StringUtil.splitc(query, '&');
for (String nameValuePair : nameValuePairs) {
if (nameValuePair.startsWith(name)) {
return true;
}
}
return false;
}
/**
* Prepares parameters for further processing.
* @param paramValues string array of param values
* @param treatEmptyParamsAsNull empty parameters should be treated as null
* @param ignoreEmptyRequestParams if all parameters are empty, return null
*/
public static String[] prepareParameters(
final String[] paramValues,
final boolean treatEmptyParamsAsNull,
final boolean ignoreEmptyRequestParams) {
if (treatEmptyParamsAsNull || ignoreEmptyRequestParams) {
int emptyCount = 0;
int total = paramValues.length;
for (int i = 0; i < paramValues.length; i++) {
String paramValue = paramValues[i];
if (paramValue == null) {
emptyCount++;
continue;
}
if (paramValue.length() == 0) {
emptyCount++;
if (treatEmptyParamsAsNull) {
paramValue = null;
}
}
paramValues[i] = paramValue;
}
if ((ignoreEmptyRequestParams) && (emptyCount == total)) {
return null;
}
}
return paramValues;
}
// ---------------------------------------------------------------- copy
/**
* Copies all request parameters to attributes.
*/
public static void copyParamsToAttributes(
final HttpServletRequest servletRequest,
final boolean treatEmptyParamsAsNull,
final boolean ignoreEmptyRequestParams) {
Enumeration paramNames = servletRequest.getParameterNames();
while (paramNames.hasMoreElements()) {
String paramName = (String) paramNames.nextElement();
if (servletRequest.getAttribute(paramName) != null) {
continue;
}
String[] paramValues = servletRequest.getParameterValues(paramName);
paramValues = prepareParameters(paramValues, treatEmptyParamsAsNull, ignoreEmptyRequestParams);
if (paramValues == null) {
continue;
}
servletRequest.setAttribute(paramName, paramValues.length == 1 ? paramValues[0] : paramValues);
}
// multipart
if (!(servletRequest instanceof MultipartRequestWrapper)) {
return;
}
MultipartRequestWrapper multipartRequest = (MultipartRequestWrapper) servletRequest;
if (!multipartRequest.isMultipart()) {
return;
}
paramNames = multipartRequest.getFileParameterNames();
while (paramNames.hasMoreElements()) {
String paramName = (String) paramNames.nextElement();
if (servletRequest.getAttribute(paramName) != null) {
continue;
}
FileUpload[] paramValues = multipartRequest.getFiles(paramName);
servletRequest.setAttribute(paramName, paramValues.length == 1 ? paramValues[0] : paramValues);
}
}
// ---------------------------------------------------------------- version
private static boolean isVersion2_5;
static {
try {
ServletContext.class.getMethod("getContextPath");
isVersion2_5 = true;
} catch (Exception ignore) {
}
}
/**
* Returns true if current servlets version is 2.5 or higher.
*/
public static boolean isServletsVersion2_5() {
return isVersion2_5;
}
// ---------------------------------------------------------------- errors
/**
* Returns servlet error.
*/
public static Throwable getServletError(final ServletRequest request) {
return (Throwable) request.getAttribute(JAVAX_SERVLET_ERROR_EXCEPTION);
}
/**
* Sets servlet error.
*/
public static void setServletError(final ServletRequest request, final Throwable throwable) {
request.setAttribute(JAVAX_SERVLET_ERROR_EXCEPTION, throwable);
}
// ---------------------------------------------------------------- debug
/**
* Returns a string with debug info from all servlet objects.
* @see #debug(HttpServletRequest, PageContext)
*/
public static String debug(final HttpServletRequest request) {
return debug(request, null);
}
/**
* Returns a string with debug info from all servlet objects.
* @see #debug(HttpServletRequest, PageContext)
*/
public static String debug(final PageContext pageContext) {
return debug((HttpServletRequest) pageContext.getRequest(), pageContext);
}
/**
* Returns a string with debug info from all servlet objects, including the page context.
*/
protected static String debug(final HttpServletRequest request, final PageContext pageContext) {
StringBuilder result = new StringBuilder();
result.append("\nPARAMETERS\n----------\n");
Enumeration enumeration = request.getParameterNames();
while (enumeration.hasMoreElements()) {
String name = (String) enumeration.nextElement();
Object[] value = request.getParameterValues(name);
result.append(name).append('=');
if (value == null) {
result.append("");
} else if (value.length == 1) {
result.append(value[0]).append('\n');
} else {
result.append('[');
for (int i = 0, valueLength = value.length; i < valueLength; i++) {
if (i == 0) {
result.append(',');
}
result.append(value[i]);
}
result.append("]\n");
}
}
HttpSession session = request.getSession();
ServletContext context = session.getServletContext();
loop:
for (int i = 0; i < 4; i++) {
switch (i) {
case 0: result.append("\nREQUEST\n-------\n");
enumeration = request.getAttributeNames();
break;
case 1: result.append("\nSESSION\n-------\n");
enumeration = session.getAttributeNames();
break;
case 2: result.append("\nAPPLICATION\n-----------\n");
enumeration = context.getAttributeNames();
break;
case 3: if (pageContext == null) {
break loop;
}
result.append("\nPAGE\n----\n");
enumeration = pageContext.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
}
while (enumeration.hasMoreElements()) {
String name = (String) enumeration.nextElement();
Object value = null;
switch (i) {
case 0: value = request.getAttribute(name); break;
case 1: value = session.getAttribute(name); break;
case 2: value = context.getAttribute(name); break;
case 3: value = pageContext.getAttribute(name); break;
}
result.append(name).append('=');
if (value == null) {
result.append("\n");
} else {
String stringValue;
try {
stringValue = value.toString();
} catch (Exception ignore) {
stringValue = "<" + value.getClass() + ">\n";
}
result.append(stringValue).append('\n');
}
}
}
return result.toString();
}
// ---------------------------------------------------------------- cache
/**
* Prevents HTTP cache.
*/
public static void preventCaching(final HttpServletResponse response) {
response.setHeader("Cache-Control", "max-age=0, must-revalidate, no-cache, no-store, private, post-check=0, pre-check=0"); // HTTP 1.1
response.setHeader("Pragma","no-cache"); // HTTP 1.0
response.setDateHeader ("Expires", 0); // prevents caching at the proxy server
}
}