com.github.netty.protocol.servlet.ServletHttpForwardRequest Maven / Gradle / Ivy
package com.github.netty.protocol.servlet;
import com.github.netty.protocol.servlet.util.HttpConstants;
import com.github.netty.protocol.servlet.util.ServletUtil;
import javax.servlet.DispatcherType;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.nio.charset.Charset;
import java.util.*;
/**
* Servlet request forwarding
*
* @author wangzihao
* 2018/7/15/015
*/
public class ServletHttpForwardRequest extends HttpServletRequestWrapper {
/**
* The parameter key required by the servlet specification
* The set of attribute names that are special for request dispatchers.
*/
private static final String[] specials = {
RequestDispatcher.FORWARD_REQUEST_URI,
RequestDispatcher.FORWARD_CONTEXT_PATH,
RequestDispatcher.FORWARD_SERVLET_PATH,
RequestDispatcher.FORWARD_PATH_INFO,
RequestDispatcher.FORWARD_QUERY_STRING
};
/**
* The parameter values required by the servlet specification
* Special attributes.
*/
private final Object[] specialAttributes = new Object[specials.length];
private String pathInfo = null;
private String queryString = null;
private String requestURI = null;
private String servletPath = null;
private ServletRequestDispatcher dispatcher;
private Map parameterMap = null;
private boolean decodePathsFlag = false;
private boolean decodeParameterFlag = false;
private String forwardPath;
private String forwardName;
private DispatcherType dispatcherType;
public ServletHttpForwardRequest(HttpServletRequest source) {
super(source);
}
public void setForwardPath(String forwardPath) {
this.forwardPath = forwardPath;
}
public void setForwardName(String forwardName) {
this.forwardName = forwardName;
}
@Override
public void setRequest(ServletRequest servletRequest) {
throw new UnsupportedOperationException("Unsupported Method On Forward setRequest ");
}
public void setDispatcher(ServletRequestDispatcher dispatcher) {
this.dispatcher = dispatcher;
}
@Override
public ServletRequestDispatcher getRequestDispatcher(String path) {
com.github.netty.protocol.servlet.ServletContext servletContext = getServletContext();
return servletContext.getRequestDispatcher(path, getDispatcherType());
}
@Override
public DispatcherType getDispatcherType() {
return dispatcherType;
}
public void setDispatcherType(DispatcherType dispatcherType) {
this.dispatcherType = dispatcherType;
}
@Override
public String getContextPath() {
return super.getContextPath();
}
@Override
public String getPathTranslated() {
ServletContext servletContext = getServletContext();
String contextPath = servletContext.getContextPath();
if (contextPath == null || contextPath.isEmpty()) {
return null;
}
String pathInfo = getPathInfo();
if (pathInfo == null) {
return null;
}
return servletContext.getRealPath(pathInfo);
}
@Override
public String getPathInfo() {
if (this.pathInfo == null && dispatcher != null) {
this.pathInfo = ServletRequestDispatcher.getPathInfo(dispatcher.getPath(), dispatcher.getMapperElement());
}
return this.pathInfo;
}
@Override
public String getQueryString() {
if (!decodePathsFlag) {
decodePaths();
}
return queryString;
}
@Override
public String getRequestURI() {
if (!decodePathsFlag) {
decodePaths();
}
return requestURI;
}
@Override
public String getServletPath() {
if (this.servletPath == null) {
String servletPath = getServletContext().getServletPath(getRequestURI());
String contextPath = getServletContext().getContextPath();
if (contextPath.length() > 0) {
servletPath = servletPath.replaceFirst(contextPath, "");
}
this.servletPath = com.github.netty.protocol.servlet.ServletContext.normPath(servletPath);
}
return this.servletPath;
}
@Override
public com.github.netty.protocol.servlet.ServletContext getServletContext() {
return (com.github.netty.protocol.servlet.ServletContext) super.getServletContext();
}
public void setPaths(String pathInfo, String queryString, String requestURI, String servletPath) {
this.pathInfo = pathInfo;
this.queryString = queryString;
this.requestURI = requestURI;
this.servletPath = servletPath;
this.decodePathsFlag = true;
}
@Override
public String[] getParameterValues(String name) {
return getParameterMap().get(name);
}
@Override
public StringBuffer getRequestURL() {
StringBuffer url = new StringBuffer();
String scheme = getScheme();
int port = getServerPort();
if (port < 0) {
port = HttpConstants.HTTP_PORT;
}
url.append(scheme);
url.append("://");
url.append(getServerName());
if ((HttpConstants.HTTP.equals(scheme) && (port != HttpConstants.HTTP_PORT))
|| (HttpConstants.HTTPS.equals(scheme) && (port != HttpConstants.HTTPS_PORT))) {
url.append(':');
url.append(port);
}
url.append(getRequestURI());
return url;
}
@Override
public Map getParameterMap() {
if (!decodeParameterFlag) {
decodeParameter();
}
return parameterMap;
}
public void setParameterMap(Map parameterMap) {
this.parameterMap = parameterMap;
this.decodeParameterFlag = true;
}
@Override
public String getParameter(String name) {
String[] values = getParameterMap().get(name);
if (values == null || values.length == 0) {
return null;
}
return values[0];
}
@Override
public Enumeration getParameterNames() {
return Collections.enumeration(getParameterMap().keySet());
}
/**
* Parsing path
*/
private void decodePaths() {
String requestURI = forwardPath;
if (requestURI != null) {
String queryString;
int queryInx = requestURI.indexOf('?');
if (queryInx != -1) {
queryString = requestURI.substring(queryInx + 1);
requestURI = requestURI.substring(0, queryInx);
} else {
queryString = null;
}
this.requestURI = com.github.netty.protocol.servlet.ServletContext.normPath(requestURI);
this.queryString = queryString;
}
this.decodePathsFlag = true;
}
/**
* Parse forward parameter
*/
private void decodeParameter() {
Map sourceParameterMap = super.getParameterMap();
Map parameterMap = new LinkedHashMap<>(sourceParameterMap);
Charset charset = Charset.forName(getCharacterEncoding());
ServletUtil.decodeByUrl(parameterMap, forwardPath, charset);
this.parameterMap = Collections.unmodifiableMap(parameterMap);
this.decodeParameterFlag = true;
}
// ------------------------------------------------------ Protected Methods
/**
* Override the getAttribute() method of the wrapped request.
*
* @param name Name of the attribute to retrieve
*/
@Override
public Object getAttribute(String name) {
int pos = getSpecial(name);
if (pos == -1) {
return getRequest().getAttribute(name);
} else {
Object value = specialAttributes[pos];
if (value != null) {
return value;
} else {
return getRequest().getAttribute(name);
}
}
}
/**
* Override the getAttributeNames() method of the wrapped
* request.
*/
@Override
public Enumeration getAttributeNames() {
return new AttributeNamesEnumerator();
}
/**
* Override the removeAttribute() method of the
* wrapped request.
*
* @param name Name of the attribute to remove
*/
@Override
public void removeAttribute(String name) {
if (!removeSpecial(name)) {
getRequest().removeAttribute(name);
}
}
/**
* Override the setAttribute() method of the
* wrapped request.
*
* @param name Name of the attribute to set
* @param value Value of the attribute to set
*/
@Override
public void setAttribute(String name, Object value) {
if (!setSpecial(name, value)) {
getRequest().setAttribute(name, value);
}
}
/**
* Is this attribute name one of the special ones that is added only for
* included servlets?
*
* @param name Attribute name to be tested
*/
protected boolean isSpecial(String name) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
return true;
}
}
return false;
}
/**
* Get a special attribute.
*
* @return the special attribute pos, or -1 if it is not a special
* attribute
*/
protected int getSpecial(String name) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
return i;
}
}
return -1;
}
/**
* Set a special attribute.
*
* @return true if the attribute was a special attribute, false otherwise
*/
protected boolean setSpecial(String name, Object value) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
specialAttributes[i] = value;
return true;
}
}
return false;
}
/**
* Remove a special attribute.
*
* @return true if the attribute was a special attribute, false otherwise
*/
protected boolean removeSpecial(String name) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
specialAttributes[i] = null;
return true;
}
}
return false;
}
// ----------------------------------- AttributeNamesEnumerator Inner Class
/**
* Utility class used to expose the special attributes as being available
* as request attributes.
*/
protected class AttributeNamesEnumerator implements Enumeration {
protected final int last;
protected final Enumeration parentEnumeration;
protected int pos = -1;
protected String next = null;
public AttributeNamesEnumerator() {
int last = -1;
parentEnumeration = getRequest().getAttributeNames();
for (int i = specialAttributes.length - 1; i >= 0; i--) {
if (getAttribute(specials[i]) != null) {
last = i;
break;
}
}
this.last = last;
}
@Override
public boolean hasMoreElements() {
return ((pos != last) || (next != null)
|| ((next = findNext()) != null));
}
@Override
public String nextElement() {
if (pos != last) {
for (int i = pos + 1; i <= last; i++) {
if (getAttribute(specials[i]) != null) {
pos = i;
return (specials[i]);
}
}
}
String result = next;
if (next != null) {
next = findNext();
} else {
throw new NoSuchElementException();
}
return result;
}
protected String findNext() {
String result = null;
while ((result == null) && (parentEnumeration.hasMoreElements())) {
String current = parentEnumeration.nextElement();
if (!isSpecial(current)) {
result = current;
}
}
return result;
}
}
}