com.sun.faces.renderkit.ClientSideStateHelper Maven / Gradle / Ivy
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package com.sun.faces.renderkit;
import com.sun.faces.config.WebConfiguration.BooleanWebContextInitParameter;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Writer;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import static com.sun.faces.config.WebConfiguration.WebContextInitParameter.ClientStateTimeout;
import static com.sun.faces.config.WebConfiguration.WebContextInitParameter.ClientStateWriteBufferSize;
import com.sun.faces.io.Base64InputStream;
import com.sun.faces.io.Base64OutputStreamWriter;
import com.sun.faces.util.FacesLogger;
/**
*
* This StateHelper provides the functionality associated with client-side state saving.
*
*/
public class ClientSideStateHelper extends StateHelper {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
/**
*
* Enabled encryption of view state. Encryption is disabled by default.
*
*
* @see {@link com.sun.faces.config.WebConfiguration.WebEnvironmentEntry#ClientStateSavingPassword}
*/
private ByteArrayGuard guard;
/**
*
* Flag indicating whether or not client view state will be manipulated
* for and checked against a configured timeout value.
*
*
*
* This flag is configured via the WebContextInitParameter.ClientStateTimeout
* configuration option of WebConfiguration and is disabled by
* default.
*
*
* @see {@link com.sun.faces.config.WebConfiguration.WebContextInitParameter#ClientStateTimeout}
*/
private boolean stateTimeoutEnabled;
/**
*
* If stateTimeoutEnabled is true this value will
* represent the time in seconds that a particular client view state is
* valid for.
*
*
* @see {@link com.sun.faces.config.WebConfiguration.WebContextInitParameter#ClientStateTimeout}
*/
private long stateTimeout;
/**
*
* Client state is generally large, so this allows some tuning to control
* the buffer that's used to write the client state.
*
*
*
* The value specified must be divisable by two as the buffer is split
* between character and bytes (due to how client state is written). By
* default, the buffer size is 8192 (per request).
*
*
* @see {@link com.sun.faces.config.WebConfiguration.WebContextInitParameter#ClientStateWriteBufferSize}
*/
private int csBuffSize;
// ------------------------------------------------------------ Constructors
/**
* Construct a new ClientSideStateHelper instance.
*/
public ClientSideStateHelper() {
init();
}
// ------------------------------------------------ Methods from StateHelper
/**
*
* Writes the view state as a String generated by Base64 encoding the
* Java Serialziation representation of the provided state
*
*
* If stateCapture is null, the Base64 encoded
* state will be written to the client as a hidden field using the ResponseWriter
* from the provided FacesContext.
*
* If stateCapture is not null, the Base64 encoded
* state will be appended to the provided StringBuilder without any markup
* included or any content written to the client.
*
* @see {@link com.sun.faces.renderkit.StateHelper#writeState(javax.faces.context.FacesContext, Object, StringBuilder)}
*/
public void writeState(FacesContext ctx,
Object state,
StringBuilder stateCapture) throws IOException {
if (stateCapture != null) {
doWriteState(state, new StringBuilderWriter(stateCapture));
} else {
ResponseWriter writer = ctx.getResponseWriter();
writer.write(stateFieldStart);
doWriteState(state, writer);
writer.write(stateFieldEnd);
writeRenderKitIdField(ctx, writer);
}
}
/**
*
Inspects the incoming request parameters for the standardized state
* parameter name. In this case, the parameter value will be a Base64 encoded
* string previously encoded by {@link com.sun.faces.renderkit.ServerSideStateHelper#writeState(javax.faces.context.FacesContext, Object, StringBuilder)}.
*
* The string will be Base64-decoded and the state reconstructed using standard
* Java serialization.
*
* @see {@link com.sun.faces.renderkit.StateHelper#getState(javax.faces.context.FacesContext, String)}
*/
public Object getState(FacesContext ctx, String viewId) throws IOException {
String stateString = getStateParamValue(ctx);
if (stateString == null) {
return null;
}
return doGetState(stateString);
}
// ------------------------------------------------------- Protected Methods
/**
* Rebuilds the view state from the Base64 included String included
* with the request.
*
* @param stateString the Base64 encoded view state
* @return the view state reconstructed from stateString
*/
protected Object doGetState(String stateString) {
ObjectInputStream ois = null;
InputStream bis = new Base64InputStream(stateString);
try {
if (guard != null) {
byte[] bytes = stateString.getBytes();
int numRead = bis.read(bytes, 0, bytes.length);
byte[] decodedBytes = new byte[numRead];
bis.reset();
bis.read(decodedBytes, 0, decodedBytes.length);
bytes = guard.decrypt(decodedBytes);
if (bytes == null) return null;
bis = new ByteArrayInputStream(bytes);
}
if (compressViewState) {
bis = new GZIPInputStream(bis);
}
ois = serialProvider.createObjectInputStream(bis);
long stateTime = 0;
if (stateTimeoutEnabled) {
try {
stateTime = ois.readLong();
} catch (IOException ioe) {
// we've caught an exception trying to read the time
// marker. This most likely means a view that has been
// around before upgrading to the release that included
// this feature. So, no marker, return null now to
// cause a ViewExpiredException
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("Client state timeout is enabled, but unable to find the "
+ "time marker in the serialized state. Assuming state "
+ "to be old and returning null.");
}
return null;
}
}
Object structure = ois.readObject();
Object state = ois.readObject();
if (stateTime != 0 && hasStateExpired(stateTime)) {
// return null if state has expired. This should cause
// a ViewExpiredException to be thrown
return null;
}
return new Object[] { structure, state };
} catch (java.io.OptionalDataException ode) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, ode.getMessage(), ode);
}
throw new FacesException(ode);
} catch (ClassNotFoundException cnfe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, cnfe.getMessage(), cnfe);
}
throw new FacesException(cnfe);
} catch (IOException iox) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, iox.getMessage(), iox);
}
throw new FacesException(iox);
} finally {
if (ois != null) {
try {
ois.close();
} catch (IOException ioe) {
// ignore
}
}
}
}
/**
* Serializes and Base64 encodes the provided state to the
* provided writer/
*
* @param state view state
* @param writer the Writer to write the content to
* @throws IOException if an error occurs writing the state to the client
*/
protected void doWriteState(Object state, Writer writer)
throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream base = null;
if (compressViewState) {
base = new GZIPOutputStream(baos, csBuffSize);
} else {
base = baos;
}
ObjectOutputStream oos = null;
try {
oos = serialProvider
.createObjectOutputStream(new BufferedOutputStream(base));
if (stateTimeoutEnabled) {
oos.writeLong(System.currentTimeMillis());
}
Object[] stateToWrite = (Object[]) state;
//noinspection NonSerializableObjectPassedToObjectStream
oos.writeObject(stateToWrite[0]);
//noinspection NonSerializableObjectPassedToObjectStream
oos.writeObject(stateToWrite[1]);
oos.flush();
oos.close();
oos = null;
// get bytes for encrypting
byte[] bytes = baos.toByteArray();
if (guard != null) {
// this will MAC
bytes = guard.encrypt(bytes);
}
// Base 64 encode
Base64OutputStreamWriter bos =
new Base64OutputStreamWriter(bytes.length, writer);
bos.write(bytes, 0, bytes.length);
bos.finish();
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE,
"Client State: total number of characters written: {0}",
bos.getTotalCharsWritten());
}
} finally {
if (oos != null) {
try {
oos.close();
} catch (IOException ioe) {
// ignore
}
}
}
}
/**
* If the {@link com.sun.faces.config.WebConfiguration.WebContextInitParameter#ClientStateTimeout} init parameter
* is set, calculate the elapsed time between the time the client state was
* written and the time this method was invoked during restore. If the client
* state has expired, return true. If the client state hasn't expired,
* or the init parameter wasn't set, return false.
* @param stateTime the time in milliseconds that the state was written
* to the client
* @return false if the client state hasn't timed out, otherwise
* return true
*/
protected boolean hasStateExpired(long stateTime) {
if (stateTimeoutEnabled) {
long elapsed = (System.currentTimeMillis() - stateTime) / 60000;
return (elapsed > stateTimeout);
} else {
return false;
}
}
/**
*
* Initialze the various configuration options for client-side
* sate saving.
*
*/
protected void init() {
if (!webConfig.isSet(BooleanWebContextInitParameter.DisableClientStateEncryption)) {
guard = new ByteArrayGuard();
} else {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, "jsf.config.webconfig.enventry.clientencrypt");
}
}
stateTimeoutEnabled = webConfig.isSet(ClientStateTimeout);
if (stateTimeoutEnabled) {
String timeout = webConfig.getOptionValue(ClientStateTimeout);
try {
stateTimeout = Long.parseLong(timeout);
} catch (NumberFormatException nfe) {
stateTimeout = Long.parseLong(ClientStateTimeout.getDefaultValue());
}
}
String size = webConfig.getOptionValue(
ClientStateWriteBufferSize);
String defaultSize =
ClientStateWriteBufferSize.getDefaultValue();
try {
csBuffSize = Integer.parseInt(size);
if (csBuffSize % 2 != 0) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
"jsf.renderkit.resstatemgr.clientbuf_div_two",
new Object[]{
ClientStateWriteBufferSize.getQualifiedName(),
size,
defaultSize});
}
csBuffSize = Integer.parseInt(defaultSize);
} else {
csBuffSize /= 2;
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("Using client state buffer size of "
+ csBuffSize);
}
}
} catch (NumberFormatException nfe) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.log(Level.WARNING,
"jsf.renderkit.resstatemgr.clientbuf_not_integer",
new Object[]{
ClientStateWriteBufferSize.getQualifiedName(),
size,
defaultSize});
}
csBuffSize = Integer.parseInt(defaultSize);
}
}
// ----------------------------------------------------------- Inner Classes
/**
* A simple Writer implementation to encapsulate a
* StringBuilder instance.
*/
protected static final class StringBuilderWriter extends Writer {
private StringBuilder sb;
// -------------------------------------------------------- Constructors
protected StringBuilderWriter(StringBuilder sb) {
this.sb = sb;
}
// ------------------------------------------------- Methods from Writer
@Override
public void write(int c) throws IOException {
sb.append((char) c);
}
@Override
public void write(char cbuf[]) throws IOException {
sb.append(cbuf);
}
@Override
public void write(String str) throws IOException {
sb.append(str);
}
@Override
public void write(String str, int off, int len) throws IOException {
sb.append(str.toCharArray(), off, len);
}
@Override
public Writer append(CharSequence csq) throws IOException {
sb.append(csq);
return this;
}
@Override
public Writer append(CharSequence csq, int start, int end)
throws IOException {
sb.append(csq, start, end);
return this;
}
@Override
public Writer append(char c) throws IOException {
sb.append(c);
return this;
}
public void write(char cbuf[], int off, int len) throws IOException {
sb.append(cbuf, off, len);
}
public void flush() throws IOException {
//no-op
}
public void close() throws IOException {
//no-op
}
} // END StringBuilderWriter
}