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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.components;
import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.Page;
import org.apache.wicket.Session;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.util.string.PrependingStringBuffer;
import org.wicketstuff.security.WaspApplication;
import org.wicketstuff.security.WaspSession;
import org.wicketstuff.security.actions.ActionFactory;
import org.wicketstuff.security.actions.WaspAction;
import org.wicketstuff.security.checks.ISecurityCheck;
import org.wicketstuff.security.checks.WaspKey;
import org.wicketstuff.security.models.ISecureModel;
import org.wicketstuff.security.strategies.SecurityException;
import org.wicketstuff.security.strategies.WaspAuthorizationStrategy;
/**
* Utility class for secure components.
*
* @author marrink
* @see ISecurityCheck
* @see ISecureComponent
* @see ISecureModel
*/
public final class SecureComponentHelper
{
/**
* String used to concatenate the parts that make up alias.
*
* @see #alias(Class)
* @see #alias(Component)
* @see #containerAlias(MarkupContainer)
* @see #containerAliasses(Component)
*/
public static final String PATH_SEPARATOR = "" + Component.PATH_SEPARATOR;
/**
* The security check placed on the component or null. This uses the metadata of a component to
* store or retrieve the {@link ISecurityCheck}.
*
* @param component
* if null, null will be returned
* @return the security check or null if none was placed on the component
*/
public static ISecurityCheck getSecurityCheck(Component component)
{
if (component != null)
return component.getMetaData(new WaspKey());
return null;
}
/**
* Places a security check on a component. This uses the metadata of a component to store or
* retrieve the {@link ISecurityCheck}.
*
* @param component
* @param securityCheck
* @return the component or null if the component was null to begin with.
*/
public static Component setSecurityCheck(Component component, ISecurityCheck securityCheck)
{
if (component == null)
return null;
component.setMetaData(new WaspKey(), securityCheck);
return component;
}
/**
* We cannot assume everybody uses the here specified public methods to store the
* {@link ISecurityCheck}, so we check if the component is a {@link ISecureComponent} and if so
* use the {@link ISecureComponent#getSecurityCheck()} on the secure component else we fall back
* to the metadata.
*
* @param component
* @return the security check or null if the component does not have one.
*/
private static ISecurityCheck saveGetSecurityCheck(Component component)
{
if (component instanceof ISecureComponent)
return ((ISecureComponent)component).getSecurityCheck();
return getSecurityCheck(component);
}
/**
* Checks if the component has a {@link ISecureModel}.
*
* @param component
* @return true if the component has a securemodel, else false.
*/
public static boolean hasSecureModel(Component component)
{
return component != null && component.getDefaultModel() instanceof ISecureModel;
}
/**
* Gets the {@link ActionFactory}.
*
* @return the actionfactory
* @throws WicketRuntimeException
* if the ActionFactory is not found.
*/
private static ActionFactory getActionFactory()
{
Application application = Application.get();
if (application instanceof WaspApplication)
{
WaspApplication app = (WaspApplication)application;
return app.getActionFactory();
}
throw new WicketRuntimeException(application + " is not a " + WaspApplication.class);
}
/**
* Gets the {@link WaspAuthorizationStrategy}.
*
* @return the strategy
* @throws WicketRuntimeException
* if a {@link WaspSession} is not found
* @throws ClassCastException
* if the session does not contain a {@link WaspAuthorizationStrategy}
*/
private static WaspAuthorizationStrategy getStrategy()
{
Session session = Session.get();
if (session instanceof WaspSession)
return (WaspAuthorizationStrategy)session.getAuthorizationStrategy();
throw new WicketRuntimeException(session + " is not a " + WaspSession.class);
}
/**
* Default implementation for {@link ISecureComponent#isActionAuthorized(String)} and
* {@link WaspAuthorizationStrategy#isActionAuthorized(Component, org.apache.wicket.authorization.Action)}
* . First tries to use the {@link ISecurityCheck} from the component if that is not available
* it tries the {@link ISecureModel} if neither is present the action is authorized on the
* component.
*
* @param component
* the component to check
* @param action
* the required action(s)
*
* @return true, if the component is authorized, false otherwise.
* @see ISecureComponent#isActionAuthorized(String)
* @see ISecurityCheck
* @see ISecureModel
*/
public static boolean isActionAuthorized(Component component, String action)
{
if (action == null)
return true;
ISecurityCheck check = saveGetSecurityCheck(component);
if (check != null)
return check.isActionAuthorized(getActionFactory().getAction(action));
if (hasSecureModel(component))
return ((ISecureModel)component.getDefaultModel()).isAuthorized(component,
getActionFactory().getAction(action));
return true;
}
/**
* Default implementation for {@link ISecureComponent#isActionAuthorized(WaspAction)} and
* {@link WaspAuthorizationStrategy#isActionAuthorized(Component, org.apache.wicket.authorization.Action)}
* . First tries to use the {@link ISecurityCheck} from the component if that is not available
* it tries the {@link ISecureModel} if neither is present the action is authorized on the
* component.
*
* @param component
* the component to check
* @param action
* the required action(s)
*
* @return true, if the component is authorized, false otherwise.
* @see ISecureComponent#isActionAuthorized(WaspAction)
* @see ISecurityCheck
* @see ISecureModel
*/
public static boolean isActionAuthorized(Component component, WaspAction action)
{
if (action == null)
return true;
ISecurityCheck check = saveGetSecurityCheck(component);
if (check != null)
return check.isActionAuthorized(action);
if (hasSecureModel(component))
return ((ISecureModel)component.getDefaultModel()).isAuthorized(component, action);
return true;
}
/**
* Default implementation for {@link ISecureComponent#isAuthenticated()}. First tries to use the
* {@link ISecurityCheck} from the component if that is not available it tries the
* {@link ISecureModel} if neither is present the user is authenticated if
* {@link WaspAuthorizationStrategy#isUserAuthenticated()} returns true.
*
* @param component
* the component to check
*
* @return true, if the user is authenticated, false otherwise.
* @see ISecureComponent#isAuthenticated()
* @see ISecurityCheck
* @see ISecureModel
*/
public static boolean isAuthenticated(Component component)
{
ISecurityCheck check = saveGetSecurityCheck(component);
if (check != null)
return check.isAuthenticated();
if (hasSecureModel(component))
return ((ISecureModel)component.getDefaultModel()).isAuthenticated(component);
return getStrategy().isUserAuthenticated();
}
/**
* Builds a 'unique' name for the component. The name is based on the page class alias and the
* relative path to the page (if not a page itself). Note that although it is unlikely, it is
* not impossible for two components to have the same alias.
*
* @param component
* @return an alias.
* @throws SecurityException
* if the component is null, or if the page of the component is not available.
*/
public static String alias(Component component)
{
// might be useful in wicket core itself
if (component == null)
throw new SecurityException("Specified component is null");
Page page = null;
try
{
page = component.getPage();
}
catch (IllegalStateException e)
{
throw new SecurityException("Unable to create alias for component: " + component, e);
}
String alias = alias(page.getClass());
String relative = component.getPageRelativePath();
if (relative == null || "".equals(relative))
return alias;
return alias + PATH_SEPARATOR + relative;
}
/**
* Builds an alias for a class.
*
* @param class1
* @return an alias
*/
public static String alias(Class class1)
{
if (class1 == null)
throw new SecurityException("Specified class is null");
return class1.getName();
}
/**
* Builds an alias string for {@link MarkupContainer}s.
*
* @param container
* @return an alias
*/
public static String containerAlias(MarkupContainer container)
{
if (container == null)
throw new SecurityException("specified markupcontainer is null");
MarkupContainer parent = container;
PrependingStringBuffer buffer = new PrependingStringBuffer(150);
while (parent != null)
{
if (buffer.length() > 0)
buffer.prepend(PATH_SEPARATOR);
buffer.prepend(parent.getClass().getName());
parent = parent.getParent();
}
return buffer.toString();
}
/**
* Builds a set of aliases for this component. Each alias can be used as name in Permission.
*
* @param component
* @return an array with aliases for this component
*/
public static String[] containerAliasses(Component component)
{
if (component == null)
throw new SecurityException("specified component is null");
MarkupContainer parent = null;
if (component instanceof MarkupContainer)
parent = (MarkupContainer)component;
else
parent = component.getParent();
if (parent == null)
return new String[0];
String alias = containerAlias(parent);
String[] split = alias.split(PATH_SEPARATOR);
String[] result = new String[split.length + (split.length - 1)];
PrependingStringBuffer buffer = new PrependingStringBuffer(200);
int index = result.length - 1;
for (int i = split.length - 1; i >= 0; i--)
{
if (i < split.length - 1)
{
result[index] = split[i];
index--;
buffer.prepend(PATH_SEPARATOR);
}
buffer.prepend(split[i]);
result[index] = buffer.toString();
index--;
}
return result;
}
}
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