authenticatedhttphandlerbase.java

来自「ajax patterns 这是关于ajax设计模式方面的原代码」· Java 代码 · 共 68 行

/*
    Copyright 2006 Christian Gross http://www.devspace.com
    From the book Ajax Patterns and Best Practices

   Licensed 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 devspace.ajax.permutations;
import javax.servlet.http.*;
import devspace.testDrivenDevelopment.tracer.*;
import javax.servlet.*;
import java.io.*;

public class AuthenticatedHttpHandlerBase extends HttpHandlerBase {
    protected UserIdentificationResolver _resolver;
    protected UserIdentification _identifiedUser;
    
    public AuthenticatedHttpHandlerBase() {
        _identifiedUser = null;
        _resolver = null;
    }
    public AuthenticatedHttpHandlerBase(UserIdentificationResolver resolver) {
        _identifiedUser = null;
        assignUserResolver(resolver);
    }
    public void assignUserResolver(UserIdentificationResolver resolver) {
        _resolver = resolver;
    }
    protected void identifyUser(HttpServletRequest request, HttpServletResponse response) throws ServletException {
        if (_identifiedUser == null) {
            GenerateOutput.Write("AuthenticatedHttpHandlerBase.IdentifyUser", "Identifying the user");
            if (_resolver == null) {
                throw new ServletException("Resolver is null");
            }
            _identifiedUser = _resolver.identifyUser(request, response);
        }
        else {
            GenerateOutput.Write("AuthenticatedHttpHandlerBase.IdentifyUser", "User has been identified");
        }
    }
    protected boolean canContinueUnidentified() {
        return false;
    }
    protected void service( HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        identifyUser(request, response);
        if (!_identifiedUser.isIdentified()) {
            if (!canContinueUnidentified()) {
                GenerateOutput.Write("AuthenticatedHttpHandlerBase.ProcessRequest", "User is not identified");
                response.setStatus( 200, "0k");
                response.getWriter().write( "User has not been identified, please identify yourself");
                return;
            }
        }
        GenerateOutput.Write("AuthenticatedHttpHandlerBase.ProcessRequest", "User is identified");
        super.service( request, response);
    }
}