org.glassfish.grizzly.servlet.ApplicationDispatcher Maven / Gradle / Ivy
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package org.glassfish.grizzly.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.DispatcherType;
import static javax.servlet.DispatcherType.INCLUDE;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestWrapper;
import javax.servlet.ServletResponse;
import javax.servlet.ServletResponseWrapper;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.http.server.util.Globals;
/**
* Standard implementation of RequestDispatcher that allows a
* request to be forwarded to a different resource to create the ultimate
* response, or to include the output of another resource in the response
* from this resource. This implementation allows application level servlets
* to wrap the request and/or response objects that are passed on to the
* called resource, as long as the wrapping classes extend
* javax.servlet.ServletRequestWrapper and
* javax.servlet.ServletResponseWrapper.
*
* @author Craig R. McClanahan
* @author Bongjae Chang
*/
final class ApplicationDispatcher implements RequestDispatcher {
// This attribute corresponds to a String[] which acts like a stack
// containing the last two pushed elements
public static final String LAST_DISPATCH_REQUEST_PATH_ATTR =
"org.apache.catalina.core.ApplicationDispatcher.lastDispatchRequestPathAttr";
private final static Logger LOGGER = Grizzly.logger( ApplicationDispatcher.class );
private class PrivilegedDispatch implements PrivilegedExceptionAction {
private ServletRequest request;
private ServletResponse response;
private DispatcherType dispatcherType;
PrivilegedDispatch( ServletRequest request, ServletResponse response,
DispatcherType dispatcherType ) {
this.request = request;
this.response = response;
this.dispatcherType = dispatcherType;
}
@Override
public Void run() throws java.lang.Exception {
doDispatch( request, response, dispatcherType );
return null;
}
}
private class PrivilegedInclude implements PrivilegedExceptionAction {
private ServletRequest request;
private ServletResponse response;
PrivilegedInclude(ServletRequest request, ServletResponse response) {
this.request = request;
this.response = response;
}
public Void run() throws ServletException, IOException {
doInclude(request,response);
return null;
}
}
/**
* Used to pass state when the request dispatcher is used. Using instance
* variables causes threading issues and state is too complex to pass and
* return single ServletRequest or ServletResponse objects.
*/
private static class State {
/**
* Outermost request that will be passed on to the invoked servlet
*/
ServletRequest outerRequest = null;
/**
* Outermost response that will be passed on to the invoked servlet.
*/
ServletResponse outerResponse = null;
/**
* Request wrapper we have created and installed (if any).
*/
ServletRequest wrapRequest = null;
/**
* Response wrapper we have created and installed (if any).
*/
ServletResponse wrapResponse = null;
/**
* The type of dispatch we are performing
*/
DispatcherType dispatcherType;
/**
* Outermost HttpServletRequest in the chain
*/
HttpServletRequest hrequest = null;
/**
* Outermost HttpServletResponse in the chain
*/
HttpServletResponse hresponse = null;
State(ServletRequest request, ServletResponse response,
DispatcherType dispatcherType) {
this.outerRequest = request;
this.outerResponse = response;
this.dispatcherType = dispatcherType;
}
}
// ----------------------------------------------------------- Constructors
/**
* Construct a new instance of this class, configured according to the
* specified parameters. If both servletPath and pathInfo are
* null, it will be assumed that this RequestDispatcher
* was acquired by name, rather than by path.
*
* @param wrapper The Wrapper associated with the resource that will
* be forwarded to or included (required)
* @param requestURI The request URI to this resource (if any)
* @param servletPath The revised servlet path to this resource (if any)
* @param pathInfo The revised extra path information to this resource
* (if any)
* @param queryString Query string parameters included with this request
* (if any)
* @param name Servlet name (if a named dispatcher was created)
* else null
*/
public ApplicationDispatcher(ServletHandler wrapper,
String requestURI,
String servletPath,
String pathInfo,
String queryString,
String name) {
super();
// Save all of our configuration parameters
this.wrapper = wrapper;
this.requestURI = requestURI;
this.servletPath = servletPath;
this.pathInfo = pathInfo;
this.queryString = queryString;
this.name = name;
if( LOGGER.isLoggable( Level.FINE ) )
LOGGER.log(Level.FINE, "servletPath={0}, pathInfo={1}, queryString={2}, name={3}",
new Object[]{this.servletPath, this.pathInfo, queryString, this.name});
}
/**
* is this dispatch cross context
*/
private Boolean crossContextFlag = null;
/**
* The servlet name for a named dispatcher.
*/
private String name = null;
/**
* The extra path information for this RequestDispatcher.
*/
private String pathInfo = null;
/**
* The query string parameters for this RequestDispatcher.
*/
private String queryString = null;
/**
* The request URI for this RequestDispatcher.
*/
private String requestURI = null;
/**
* The servlet path for this RequestDispatcher.
*/
private String servletPath = null;
/**
* The Wrapper associated with the resource that will be forwarded to
* or included.
*/
private ServletHandler wrapper = null;
// --------------------------------------------------------- Public Methods
/**
* Forwards the given request and response to the resource
* for which this dispatcher was acquired.
*
* Any runtime exceptions, IOException, or ServletException thrown
* by the target will be propagated to the caller.
*
* @param request The request to be forwarded
* @param response The response to be forwarded
*
* @throws IOException if an input/output error occurs
* @throws ServletException if a servlet exception occurs
*/
@Override
public void forward(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
dispatch(request, response, DispatcherType.FORWARD);
}
/**
* Dispatches the given request and response to the resource
* for which this dispatcher was acquired.
*
*
Any runtime exceptions, IOException, or ServletException thrown
* by the target will be propagated to the caller.
*
* @param request The request to be forwarded
* @param response The response to be forwarded
* @param dispatcherType The type of dispatch to be performed
*
* @throws IOException if an input/output error occurs
* @throws ServletException if a servlet exception occurs
* @throws IllegalArgumentException if the dispatcher type is different
* from FORWARD, ERROR, and ASYNC
*/
@SuppressWarnings( "unchecked" )
public void dispatch(ServletRequest request, ServletResponse response,
DispatcherType dispatcherType)
throws ServletException, IOException {
if (!DispatcherType.FORWARD.equals(dispatcherType) &&
!DispatcherType.ERROR.equals(dispatcherType) &&
!DispatcherType.ASYNC.equals(dispatcherType)) {
throw new IllegalArgumentException( "Illegal dispatcher type" );
}
boolean isCommit = (DispatcherType.FORWARD.equals(dispatcherType) ||
DispatcherType.ERROR.equals(dispatcherType));
if(System.getSecurityManager() != null) {
try {
PrivilegedDispatch dp = new PrivilegedDispatch(
request, response, dispatcherType);
AccessController.doPrivileged(dp);
// START SJSAS 6374990
if (isCommit && !request.isAsyncStarted()) {
closeResponse( response );
}
// END SJSAS 6374990
} catch (PrivilegedActionException pe) {
Exception e = pe.getException();
if (e instanceof ServletException)
throw (ServletException) e;
throw (IOException) e;
}
} else {
doDispatch(request, response, dispatcherType);
// START SJSAS 6374990
if (isCommit && !request.isAsyncStarted()) {
closeResponse( response );
}
// END SJSAS 6374990
}
}
private void doDispatch(ServletRequest request, ServletResponse response,
DispatcherType dispatcherType)
throws ServletException, IOException {
if (!DispatcherType.ASYNC.equals(dispatcherType)) {
// Reset any output that has been buffered, but keep
// headers/cookies
if( response.isCommitted() ) {
if( LOGGER.isLoggable( Level.FINE ) )
LOGGER.fine( " Forward on committed response --> ISE" );
throw new IllegalStateException( "Cannot forward after response has been committed" );
}
try {
response.resetBuffer();
} catch (IllegalStateException e) {
if(LOGGER.isLoggable( Level.FINE))
LOGGER.log(Level.FINE, "Forward resetBuffer() returned ISE: {0}", e);
throw e;
}
}
if (DispatcherType.INCLUDE != dispatcherType) {
DispatchTargetsInfo dtInfo =
(DispatchTargetsInfo)request.getAttribute(
LAST_DISPATCH_REQUEST_PATH_ATTR);
if (dtInfo == null) {
dtInfo = new DispatchTargetsInfo();
request.setAttribute(LAST_DISPATCH_REQUEST_PATH_ATTR, dtInfo);
}
if (servletPath == null && pathInfo == null) {
// Handle an HTTP named dispatcher forward
dtInfo.addDispatchTarget(wrapper.getName(), true);
} else {
dtInfo.addDispatchTarget(getCombinedPath(), false);
}
}
// Set up to handle the specified request and response
State state = new State(request, response, dispatcherType);
ServletRequest sr = wrapRequest(state);
wrapResponse(state);
// Identify the HTTP-specific request and response objects (if any)
HttpServletRequest hrequest = state.hrequest;
HttpServletResponse hresponse = state.hresponse;
if ((hrequest == null) || (hresponse == null)) {
// Handle a non-HTTP forward
processRequest(request, response, state);
} else if ((servletPath == null) && (pathInfo == null)) {
// Handle an HTTP named dispatcher forward
DispatchedHttpServletRequest wrequest = (DispatchedHttpServletRequest) sr;
wrequest.setRequestURI(hrequest.getRequestURI());
wrequest.setContextPath(hrequest.getContextPath());
wrequest.setServletPath(hrequest.getServletPath());
wrequest.setPathInfo(hrequest.getPathInfo());
wrequest.setQueryString(hrequest.getQueryString());
processRequest(request, response, state);
} else {
// Handle an HTTP path-based forward
DispatchedHttpServletRequest wrequest = (DispatchedHttpServletRequest) sr;
// If the request is being FORWARD- or ASYNC-dispatched for
// the first time, initialize it with the required request
// attributes
if((DispatcherType.FORWARD.equals( dispatcherType) &&
hrequest.getAttribute(DispatcherConstants.FORWARD_REQUEST_URI) == null) ||
(DispatcherType.ASYNC.equals(dispatcherType) &&
hrequest.getAttribute(DispatcherConstants.ASYNC_REQUEST_URI) == null)) {
wrequest.initSpecialAttributes(hrequest.getRequestURI(),
hrequest.getContextPath(),
hrequest.getServletPath(),
hrequest.getPathInfo(),
hrequest.getQueryString());
}
String targetContextPath = wrapper.getContextPath();
// START IT 10395
HttpServletRequestImpl requestFacade = wrequest.getRequestFacade();
String originContextPath = requestFacade.getContextPath();
if(originContextPath != null &&
originContextPath.equals(targetContextPath)) {
targetContextPath = hrequest.getContextPath();
}
// END IT 10395
wrequest.setContextPath(targetContextPath);
wrequest.setRequestURI(requestURI);
wrequest.setServletPath(servletPath);
wrequest.setPathInfo(pathInfo);
if (queryString != null) {
wrequest.setQueryString(queryString);
wrequest.setQueryParams(queryString);
}
processRequest(request, response, state);
}
recycleRequestWrapper(state);
unwrapRequest(state);
unwrapResponse(state);
}
/**
* Prepare the request based on the filter configuration.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @throws IOException if an input/output error occurs
* @throws ServletException if a servlet error occurs
*/
private void processRequest(ServletRequest request,
ServletResponse response,
State state)
throws IOException, ServletException {
if (request != null) {
if (state.dispatcherType != DispatcherType.ERROR) {
state.outerRequest.setAttribute(
Globals.DISPATCHER_REQUEST_PATH_ATTR,
getCombinedPath());
invoke(state.outerRequest, response, state);
} else {
invoke(state.outerRequest, response, state);
}
}
}
/**
* Combines the servletPath and the pathInfo.
*
* If pathInfo is null, it is ignored. If servletPath
* is null, then null is returned.
*
* @return The combined path with pathInfo appended to servletInfo
*/
private String getCombinedPath() {
if (servletPath == null) {
return null;
}
if (pathInfo == null) {
return servletPath;
}
return servletPath + pathInfo;
}
/**
* Include the response from another resource in the current response.
* Any runtime exception, IOException, or ServletException thrown by the
* called servlet will be propagated to the caller.
*
* @param request The servlet request that is including this one
* @param response The servlet response to be appended to
*
* @throws IOException if an input/output error occurs
* @throws ServletException if a servlet exception occurs
*/
@SuppressWarnings( "unchecked" )
@Override
public void include(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
if (System.getSecurityManager() != null) {
try {
PrivilegedInclude dp = new PrivilegedInclude(request,response);
AccessController.doPrivileged(dp);
} catch (PrivilegedActionException pe) {
Exception e = pe.getException();
if (e instanceof ServletException)
throw (ServletException) e;
throw (IOException) e;
}
} else {
doInclude(request,response);
}
}
private void doInclude(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
// Set up to handle the specified request and response
State state = new State(request, response, DispatcherType.INCLUDE);
// Create a wrapped response to use for this request
wrapResponse(state);
// Handle a non-HTTP include
/* GlassFish 6386229
if (!(request instanceof HttpServletRequest) ||
!(response instanceof HttpServletResponse)) {
if ( log.isDebugEnabled() )
log.debug(" Non-HTTP Include");
request.setAttribute(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
Integer.valueOf(ApplicationFilterFactory.INCLUDE));
request.setAttribute(ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
//origServletPath);
servletPath);
try{
invoke(request, state.outerResponse, state);
} finally {
unwrapResponse(state);
}
}
// Handle an HTTP named dispatcher include
else if (name != null) {
*/
// START GlassFish 6386229
// Handle an HTTP named dispatcher include
if (name != null) {
// END GlassFish 6386229
DispatchedHttpServletRequest wrequest = (DispatchedHttpServletRequest) wrapRequest(state);
wrequest.setAttribute(Globals.NAMED_DISPATCHER_ATTR, name);
if (servletPath != null)
wrequest.setServletPath(servletPath);
wrequest.setAttribute(Globals.DISPATCHER_REQUEST_PATH_ATTR,
getCombinedPath());
try{
invoke(state.outerRequest, state.outerResponse, state);
} finally {
recycleRequestWrapper(state);
unwrapRequest(state);
unwrapResponse(state);
}
}
// Handle an HTTP path based include
else {
DispatchedHttpServletRequest wrequest = (DispatchedHttpServletRequest) wrapRequest(state);
wrequest.initSpecialAttributes(requestURI,
wrapper.getContextPath(),
servletPath,
pathInfo,
queryString);
wrequest.setQueryParams(queryString);
wrequest.setAttribute(Globals.DISPATCHER_REQUEST_PATH_ATTR,
getCombinedPath());
try{
invoke(state.outerRequest, state.outerResponse, state);
} finally {
recycleRequestWrapper(state);
unwrapRequest(state);
unwrapResponse(state);
}
}
}
// -------------------------------------------------------- Private Methods
/**
* Ask the resource represented by this RequestDispatcher to process
* the associated request, and create (or append to) the associated
* response.
*
* IMPLEMENTATION NOTE: This implementation assumes
* that no filters are applied to a forwarded or included resource,
* because they were already done for the original request.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @throws IOException if an input/output error occurs
* @throws ServletException if a servlet error occurs
*/
private void invoke(ServletRequest request, ServletResponse response,
State state)
throws IOException, ServletException {
//START OF 6364900 original invoke has been renamed to doInvoke
boolean crossContext = false;
if (crossContextFlag != null && crossContextFlag.booleanValue()) {
crossContext = true;
}
try {
doInvoke(request, response, crossContext, state);
} finally {
crossContextFlag = null;
}
//END OF 6364900
}
/**
* Ask the resource represented by this RequestDispatcher to process
* the associated request, and create (or append to) the associated
* response.
*
* IMPLEMENTATION NOTE: This implementation assumes
* that no filters are applied to a forwarded or included resource,
* because they were already done for the original request.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
* @param crossContext true if the request dispatch is crossing context
* boundaries, false otherwise
* @param state the state of this ApplicationDispatcher
*
* @throws IOException if an input/output error occurs
* @throws ServletException if a servlet error occurs
*/
private void doInvoke(ServletRequest request,
ServletResponse response,
boolean crossContext,
State state)
throws IOException, ServletException {
ClassLoader oldCCL = null;
try {
// Checking to see if the context classloader is the current context
// classloader. If it's not, we're saving it, and setting the context
// classloader to the Context classloader
if (crossContext) {
ClassLoader contextClassLoader = wrapper.getClassLoader();
if (contextClassLoader != null) {
oldCCL = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader( contextClassLoader );
}
}
wrapper.doServletService(request, response, state.dispatcherType);
} finally {
// Reset the old context class loader
if (oldCCL != null)
Thread.currentThread().setContextClassLoader(oldCCL);
}
}
/**
* Unwrap the request if we have wrapped it.
*/
private void unwrapRequest(State state) {
if (state.wrapRequest == null)
return;
ServletRequest previous = null;
ServletRequest current = state.outerRequest;
while (current != null) {
// If we run into the container request we are done
if (current instanceof HttpServletRequestImpl)
break;
// Remove the current request if it is our wrapper
if(current == state.wrapRequest) {
ServletRequest next =
((ServletRequestWrapper) current).getRequest();
if (previous == null)
state.outerRequest = next;
else
((ServletRequestWrapper) previous).setRequest(next);
break;
}
// Advance to the next request in the chain
previous = current;
current = ((ServletRequestWrapper) current).getRequest();
}
}
/**
* Unwrap the response if we have wrapped it.
*/
private void unwrapResponse(State state) {
if (state.wrapResponse == null)
return;
ServletResponse previous = null;
ServletResponse current = state.outerResponse;
while (current != null) {
// If we run into the container response we are done
if (current instanceof HttpServletResponseImpl)
break;
// Remove the current response if it is our wrapper
if (current == state.wrapResponse) {
ServletResponse next =
((ServletResponseWrapper) current).getResponse();
if (previous == null)
state.outerResponse = next;
else
((ServletResponseWrapper) previous).setResponse(next);
break;
}
// Advance to the next response in the chain
previous = current;
current = ((ServletResponseWrapper) current).getResponse();
}
}
/**
* Create and return a request wrapper that has been inserted in the
* appropriate spot in the request chain.
*/
private ServletRequest wrapRequest(State state) {
// Locate the request we should insert in front of
ServletRequest previous = null;
ServletRequest current = state.outerRequest;
while (current != null) {
if (state.hrequest == null && (current instanceof HttpServletRequest)) {
state.hrequest = (HttpServletRequest)current;
}
if (!(current instanceof ServletRequestWrapper)) {
break;
}
// If we find container-generated wrapper, break out
if (current instanceof DispatchedHttpServletRequest) {
break;
}
previous = current;
current = ((ServletRequestWrapper) current).getRequest();
}
if (current == null) {
throw new IllegalStateException("Can't retrieve container request from " + state.outerRequest);
}
// Instantiate a new wrapper at this point and insert it in the chain
ServletRequest wrapperLocal = null;
// Compute a crossContext flag
HttpServletRequest hcurrent = (HttpServletRequest) current;
boolean crossContext = false;
if ((state.outerRequest instanceof DispatchedHttpServletRequest)
|| (state.outerRequest instanceof HttpServletRequest)) {
HttpServletRequest houterRequest =
(HttpServletRequest) state.outerRequest;
Object contextPath = houterRequest.getAttribute(
RequestDispatcher.INCLUDE_CONTEXT_PATH);
if (contextPath == null) {
// Forward
contextPath = houterRequest.getContextPath();
}
crossContext = !(wrapper.getContextPath().equals(contextPath));
}
//START OF 6364900
crossContextFlag = Boolean.valueOf(crossContext);
//END OF 6364900
wrapperLocal = new DispatchedHttpServletRequest(hcurrent,
wrapper.getServletCtx(), crossContext,
state.dispatcherType);
if (previous == null) {
state.outerRequest = wrapperLocal;
} else {
((ServletRequestWrapper) previous).setRequest(wrapperLocal);
}
state.wrapRequest = wrapperLocal;
return wrapperLocal;
}
/**
* Create and return a response wrapper that has been inserted in the
* appropriate spot in the response chain.
*/
private ServletResponse wrapResponse(State state) {
// Locate the response we should insert in front of
ServletResponse previous = null;
ServletResponse current = state.outerResponse;
while (current != null) {
if(state.hresponse == null && (current instanceof HttpServletResponse)) {
state.hresponse = (HttpServletResponse) current;
if (DispatcherType.INCLUDE != state.dispatcherType) // Forward only needs hresponse
return null;
}
if (!(current instanceof ServletResponseWrapper))
break;
if (current instanceof DispatchedHttpServletResponse)
break;
previous = current;
current = ((ServletResponseWrapper) current).getResponse();
}
HttpServletResponse hcurrent = (HttpServletResponse) current;
// Instantiate a new wrapper and insert it in the chain
DispatchedHttpServletResponse wrapperLocal =
new DispatchedHttpServletResponse(hcurrent,
INCLUDE.equals(state.dispatcherType ));
if (previous == null)
state.outerResponse = wrapperLocal;
else
((ServletResponseWrapper) previous).setResponse(wrapperLocal);
state.wrapResponse = wrapperLocal;
return wrapperLocal;
}
private static void closeResponse( ServletResponse response ) {
try {
PrintWriter writer = response.getWriter();
writer.flush();
writer.close();
} catch( IllegalStateException e ) {
try {
ServletOutputStream stream = response.getOutputStream();
stream.flush();
stream.close();
} catch(IllegalStateException ignored) {
} catch(IOException ignored) {
}
} catch(IOException ignored) {
}
}
private void recycleRequestWrapper(State state) {
if (state.wrapRequest instanceof DispatchedHttpServletRequest) {
((DispatchedHttpServletRequest) state.wrapRequest).recycle();
}
}
}