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Wicket Abstract Security Platform
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wicketstuff.security.strategies;
import java.io.Serializable;
import java.util.Map;
import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.Session;
import org.apache.wicket.authorization.Action;
import org.apache.wicket.authorization.IAuthorizationStrategy;
import org.apache.wicket.model.IModel;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.util.string.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wicketstuff.security.WaspApplication;
import org.wicketstuff.security.WaspSession;
import org.wicketstuff.security.actions.WaspAction;
import org.wicketstuff.security.actions.WaspActionFactory;
import org.wicketstuff.security.authentication.LoginException;
import org.wicketstuff.security.checks.ISecurityCheck;
import org.wicketstuff.security.components.ISecureComponent;
import org.wicketstuff.security.components.SecureComponentHelper;
import org.wicketstuff.security.log.AuthorizationErrorKey;
import org.wicketstuff.security.log.AuthorizationMessageSource;
import org.wicketstuff.security.log.IAuthorizationMessageSource;
import org.wicketstuff.security.models.ISecureModel;
/**
* Base class for every strategy. Checks Authorization and authentication at the class, component
* and model levels.
*
* @author marrink
*/
public abstract class WaspAuthorizationStrategy implements IAuthorizationStrategy, Serializable
{
private static final long serialVersionUID = 1L;
private static final Logger log = LoggerFactory.getLogger(WaspAuthorizationStrategy.class);
/**
* Key used to store the {@link IAuthorizationMessageSource} in the {@link RequestCycle}
* metadata.
*/
protected static final AuthorizationErrorKey MESSAGE_KEY = new AuthorizationErrorKey();
private static final ThreadLocal resolver = new ThreadLocal();
/**
* Performs the actual authorization check on the component.
*
* @param component
* @param action
* @return true if authorized, false otherwise
*/
public abstract boolean isComponentAuthorized(Component component, WaspAction action);
/**
* Performs the actual authorization check on the model of the component.
*
* @param model
* the model
* @param component
* component 'owning' the model if available
* @param action
* the action to check
* @return true if authorized, false otherwise
*/
public abstract boolean isModelAuthorized(ISecureModel model, Component component,
WaspAction action);
/**
* Performs the actual authorization check on the component class.
*
* @param clazz
* typically a component
* @param action
* the action to check
* @return true if authorized, false otherwise
*/
public abstract boolean isClassAuthorized(Class clazz, WaspAction action);
/**
* Performs the authentication check.
*
* @param component
* the wicket component
*
* @return true if the user is authenticated, false otherwise
*/
public abstract boolean isComponentAuthenticated(Component component);
/**
* Performs the authentication check.
*
* @param model
* the (secure) model
* @param component
* the component owning the model
*
* @return true if the user is authenticated, false otherwise
*/
public abstract boolean isModelAuthenticated(IModel model, Component component);
/**
* Performs the authentication check.
*
* @param clazz
* the class of the wicket component
*
* @return true if the user is authenticated, false otherwise
*/
public abstract boolean isClassAuthenticated(Class clazz);
/**
* Checks if there is a user logged in at all. This will return true after a successful
* {@link #login(Object)} and false after a successful {@link #logoff(Object)}. Note that in a
* multi-login scenario this method returns true until all successful logins are countered with
* a successful logoff.
*
* @return true while a user is logged in, false otherwise
*/
public abstract boolean isUserAuthenticated();
/**
* Attempts to log the user in. Note to implementations: It is generally considered a bad idea
* to store the context if it contains sensitive data (like a plaintext password).
*
* @param context
* a not further specified object that provides all the information to log the user
* on
* @throws LoginException
* if the login is unsuccessful
*/
public abstract void login(Object context) throws LoginException;
/**
* Log the user off. With the help of a context implementations might facilitate multi level
* login / logoff.
*
* @param context
* a not further specified object, might be null
* @return true if the logoff was successful, false otherwise
*/
public abstract boolean logoff(Object context);
/**
* Called at the end of the sessions lifecycle to perform some clean up.
*/
public abstract void destroy();
/**
*
* @see org.apache.wicket.authorization.IAuthorizationStrategy#isActionAuthorized(org.apache.wicket.Component,
* org.apache.wicket.authorization.Action)
*/
public boolean isActionAuthorized(Component component, Action action)
{
if (component != null)
{
ISecurityCheck check = getSecurityCheck(component);
if (check != null)
{
if (check.isActionAuthorized(getActionFactory().getAction(action)))
return true;
IAuthorizationMessageSource message = getMessageSource();
if (message != null)
{
message.setComponent(component);
message.addVariable("wicket.action", action);
message.addVariable("wasp.action", getActionFactory().getAction(action));
logMessage(message);
}
return false;
}
IModel model = component.getDefaultModel();
if (model instanceof ISecureModel)
{
if (((ISecureModel)model).isAuthorized(component,
getActionFactory().getAction(action)))
return true;
IAuthorizationMessageSource message = getMessageSource();
if (message != null)
{
message.setComponent(component);
message.addVariable("wicket.action", action);
message.addVariable("wasp.action", getActionFactory().getAction(action));
logMessage(message);
}
return false;
}
}
return true;
}
/**
* Logs a message indication an action was denied. The message is retrieved through localization
* with the following resource key:"authorization.denied" (no quotes). This method removes the
* messagesource from the requestcycle.
*
* @param message
* messagesource
* @see #logMessage(String, Map, IAuthorizationMessageSource, boolean)
*/
protected final void logMessage(IAuthorizationMessageSource message)
{
logMessage("authorization.denied", null, message, true);
}
/**
* Logs a message indication an action was denied. The message is retrieved through localization
* with the specified resource key. Optionally the message can be removed from the requestcycle,
* if it is not removed the message might be processed multiple times (which might be what you
* want if you want to use different resource keys). This invokes
* {@link #logMessage(String, Map, IAuthorizationMessageSource)}
*
*
* @param key
* the resource key to lookup the message
* @param variables
* optional map containing additional variables that can be used during the message
* lookup
* @param message
* messagesource
* @param remove
* flag indicating if the message should be removed or not
* @see #removeMessageSource()
* @see #logMessage(String, Map, IAuthorizationMessageSource)
*/
protected final void logMessage(String key, Map variables,
IAuthorizationMessageSource message, boolean remove)
{
if (message == null || Strings.isEmpty(key))
{
if (remove)
removeMessageSource();
return;
}
logMessage(key, variables, message);
if (remove)
removeMessageSource();
}
/**
* Logs a message indication an action was denied. The message is retrieved through localization
* with the specified resource key. This default implementation simply does something like
* log.debug(...) Overwrite this method if you want for example wicket to print
* feedback messages with something like Session.get().error(...)
*
* @param key
* the resource key for the message
* @param variables
* optional map containing additional variables that can be used during message
* construction
* @param message
* the messagesource
*/
protected void logMessage(String key, Map variables,
IAuthorizationMessageSource message)
{
String msg = message.getMessage(key, variables);
if (!Strings.isEmpty(msg))
log.debug(msg);
}
/**
* Removes the message from the {@link RequestCycle}'s metadata.
*/
protected final void removeMessageSource()
{
RequestCycle.get().setMetaData(MESSAGE_KEY, null);
}
/**
* Retrieves the messagesource from the {@link RequestCycle}'s metadata.
*
* @return the messagesource or null if there is none
*/
protected final IAuthorizationMessageSource getMessageSource()
{
return getMessageSource(false);
}
/**
* Retrieves the messagesource from the {@link RequestCycle}'s metadata. optionally creating a
* new one if there is not already one.
*
* @param create
* @return the messagesource or null if there is none and the create flag was false
*/
protected final IAuthorizationMessageSource getMessageSource(boolean create)
{
IAuthorizationMessageSource resource = null;
if (RequestCycle.get() != null)
resource = RequestCycle.get().getMetaData(MESSAGE_KEY);
if (resource == null && create)
{
resource = createMessageSource();
RequestCycle.get().setMetaData(MESSAGE_KEY, resource);
}
return resource;
}
/**
* Creates a new {@link IAuthorizationMessageSource}. Subclasses can override this to return
* there own implementation.
*
* @return a new IErrorMessageSource, never null
*/
protected IAuthorizationMessageSource createMessageSource()
{
return new AuthorizationMessageSource();
}
/**
* Indicates if messages about denied actions should be logged. Default is to use the slf4 log
* implementation checking if debug messages should be printed. for example using log4j as the
* logging implementation for slf4j logging could be turned on by putting the following line in
* your log4.properties
* log4j.category.org.wicketstuff.security.strategies.WaspAuthorizationStrategy=DEBUG
*
*
* @return true if messages should be logged, false otherwise
*/
protected boolean logMessages()
{
return log.isDebugEnabled();
}
/**
* We cannot assume everybody uses the here specified public methods to store the securitycheck,
* so we check if the component is a ISecureComponent and if so use the getSecurityCheck on the
* secure component else we fall back to the SecureComponentHelper.
*
* @param component
* @return the security check of the component or null if the component does not have one
* @see SecureComponentHelper#getSecurityCheck(Component)
*/
protected final ISecurityCheck getSecurityCheck(Component component)
{
if (component instanceof ISecureComponent)
return ((ISecureComponent)component).getSecurityCheck();
return SecureComponentHelper.getSecurityCheck(component);
}
/**
* Shortcut to the actionfactory.
*
* @return the actionfactory from the application
*/
protected final WaspActionFactory getActionFactory()
{
return ((WaspApplication)Application.get()).getActionFactory();
}
/**
* Returns the WaspAuthorizationStrategy. This defaults to
* {@link WaspSession#getAuthorizationStrategy()}, but a different implementation can be
* registered via a {@link StrategyResolver}.
*
* @return
*/
public static WaspAuthorizationStrategy get()
{
StrategyResolver threadResolver = resolver.get();
return threadResolver == null
? (WaspAuthorizationStrategy)((WaspSession)Session.get()).getAuthorizationStrategy()
: threadResolver.getStrategy();
}
/**
* Sets the StrategyResolver for the current thread
*
* @param threadResolver
*/
public static void setStrategyResolver(StrategyResolver threadResolver)
{
resolver.set(threadResolver);
}
}
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