abstractpersondirectorycredentialstoprincipalresolver.java

来自「CAS在Tomcat中实现单点登录项目,单点登录（Single Sign On 」· Java 代码 · 共 65 行

/*
 * Copyright 2007 The JA-SIG Collaborative. All rights reserved. See license
 * distributed with this file and available online at
 * http://www.uportal.org/license.html
 */
package org.jasig.cas.authentication.principal;

import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jasig.cas.util.annotation.NotNull;
import org.jasig.services.persondir.IPersonAttributeDao;
import org.jasig.services.persondir.support.StubPersonAttributeDao;

/**
 * 
 * @author Scott Battaglia
 * @version $Revision: 1.1 $ $Date: 2005/08/19 18:27:17 $
 * @since 3.1
 *
 */
public abstract class AbstractPersonDirectoryCredentialsToPrincipalResolver
    implements CredentialsToPrincipalResolver {

    /** Log instance. */
    protected final Log log = LogFactory.getLog(this.getClass());
    
    /** Repository of principal attributes to be retrieved */
    @NotNull
    private IPersonAttributeDao attributeRepository = new StubPersonAttributeDao();

    public final Principal resolvePrincipal(final Credentials credentials) {
        if (log.isDebugEnabled()) {
            log.debug("Attempting to resolve a principal...");
        }

        final String principalId = extractPrincipalId(credentials);
        
        if (principalId == null) {
            return null;
        }
        
        if (log.isDebugEnabled()) {
            log.debug("Creating SimplePrincipal for ["
                + principalId + "]");
        }
        
        final Map attributes = this.attributeRepository.getUserAttributes(principalId);
        return new SimplePrincipal(principalId, attributes);
    }
    
    /**
     * Extracts the id of the user from the provided credentials.
     * 
     * @param credentials the credentials provided by the user.
     * @return the username, or null if it could not be resolved.
     */
    protected abstract String extractPrincipalId(Credentials credentials);
    
    public final void setAttributeRepository(final IPersonAttributeDao attributeRepository) {
        this.attributeRepository = attributeRepository;
    }
}