/*
 * 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.apache.photark.security.authentication.services;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Map;

import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.photark.security.authorization.AccessManager;
import org.oasisopen.sca.annotation.Scope;
import org.oasisopen.sca.annotation.Service;

import com.dyuproject.openid.OpenIdServletFilter;
import com.dyuproject.openid.OpenIdUser;
import com.dyuproject.openid.RelyingParty;
import com.dyuproject.openid.YadisDiscovery;
import com.dyuproject.openid.ext.AxSchemaExtension;
import com.dyuproject.openid.ext.SRegExtension;
import com.dyuproject.util.http.UrlEncodedParameterMap;

/**
 * OpenID Authentication Service Impl. If authenticated, goes to the home page. If not, goes to the login page.
 * 
 * 
 */
@Service(Servlet.class)
@Scope("COMPOSITE")
public class OpenIDAuthenticationServiceImpl extends HttpServlet implements Servlet 
{
  
    private static final long serialVersionUID = -5304887357860915253L;

    static
    {
        RelyingParty.getInstance()
        .addListener(new SRegExtension()
            .addExchange("email")
            .addExchange("country")
            .addExchange("language")
        )
        .addListener(new AxSchemaExtension()
            .addExchange("email")
            .addExchange("country")
            .addExchange("language")
        )
        .addListener(new RelyingParty.Listener()
        {
            public void onDiscovery(OpenIdUser user, HttpServletRequest request)
            {
                System.err.println("discovered user: " + user.getClaimedId());
            }            
            public void onPreAuthenticate(OpenIdUser user, HttpServletRequest request,
                    UrlEncodedParameterMap params)
            {
                System.err.println("pre-authenticate user: " + user.getClaimedId());
            }          

            public void onAuthenticate(OpenIdUser user, HttpServletRequest request)
            {
                System.err.println("newly authenticated user: " + user.getIdentity());
                
            	AccessManager am= new AccessManager();
            	
            	//Invalidating the Super Admin user
            	request.getSession().invalidate();
            	//Creating the accessList for the newly authenticated user
        	    //Creating the accessList
        	    String accesList=am.creatAccessList(user.getIdentity());
        	    request.getSession().setAttribute("accessList", accesList);

                Map<String,String> sreg = SRegExtension.remove(user);
                Map<String,String> axschema = AxSchemaExtension.remove(user);
                if(sreg!=null && !sreg.isEmpty())
                {
                    System.err.println("sreg: " + sreg);
                    user.setAttribute("info", sreg);
                }
                else if(axschema!=null && !axschema.isEmpty())
                {                    
                    System.err.println("axschema: " + axschema);
                    user.setAttribute("info", axschema);
                }          
            }            
            public void onAccess(OpenIdUser user, HttpServletRequest request)
            {        
                System.err.println("user access: " + user.getIdentity());
                System.err.println("info: " + user.getAttribute("info"));
            }   
        });
    }

    RelyingParty _relyingParty = RelyingParty.getInstance();
    
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException
    {
        doPost(request, response);
    }
    
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException
    {
        String loginWith = request.getParameter("loginWith");
        if(loginWith!=null)
        {
            // If the ui supplies a LoginWithGoogle or LoginWithYahoo link/button, 
            // this will speed up the openid process by skipping discovery. 
            // The override is done by adding the OpenIdUser to the request attribute.
            if(loginWith.equals("google"))
            {
                OpenIdUser user = OpenIdUser.populate("https://www.google.com/accounts/o8/id", 
                        YadisDiscovery.IDENTIFIER_SELECT, 
                        "https://www.google.com/accounts/o8/ud");
                request.setAttribute(OpenIdUser.ATTR_NAME, user);
                
            }
            else if(loginWith.equals("yahoo"))
            {
                OpenIdUser user = OpenIdUser.populate("http://yahoo.com/", 
                        YadisDiscovery.IDENTIFIER_SELECT, 
                        "https://open.login.yahooapis.com/openid/op/auth");
                request.setAttribute(OpenIdUser.ATTR_NAME, user);
            }
        }
        
        String errorMsg = OpenIdServletFilter.DEFAULT_ERROR_MSG;
        try
        {
            OpenIdUser user = _relyingParty.discover(request);
            if(user==null)
            {                
                if(RelyingParty.isAuthResponse(request))
                {
                    // authentication timeout                    
                    response.sendRedirect(request.getRequestURI());
                }
                else
                {
                    // set error msg if the openid_identifier is not resolved.
                    if(request.getParameter(_relyingParty.getIdentifierParameter())!=null){
                        request.setAttribute(OpenIdServletFilter.ERROR_MSG_ATTR, errorMsg);//TODO error pages, massage not passed to front end
                        request.getRequestDispatcher("/home/error.html").forward(request, response);
                    }else{
                    // new user
                    request.getRequestDispatcher("/home/login.html").forward(request, response);
                    //response.sendRedirect(request.getContextPath() + "/home/login.html");
                    }
                }
                return;
            }
            
            if(user.isAuthenticated())
            {
                // user already authenticated
               // request.getRequestDispatcher("/home/home.jsp").forward(request, response);
            	//added by suho
                response.sendRedirect(request.getContextPath() + "/admin/upload.html");
               
                return;
            }
            
            if(user.isAssociated() && RelyingParty.isAuthResponse(request))
            {
                // verify authentication
                if(_relyingParty.verifyAuth(user, request, response))
                {
                    // authenticated                    
                    // redirect to home to remove the query params instead of doing:
                    // request.getRequestDispatcher("/home.jsp").forward(request, response);
                    response.sendRedirect(request.getContextPath() + "/home/authenticate");
                }
                else
                {
                    // failed verification
                    //request.getRequestDispatcher("/home/login.jsp").forward(request, response);
                    request.getRequestDispatcher("/home/error.html").forward(request, response);
                }
                return;
            }
            
            // associate and authenticate user
            StringBuffer url = request.getRequestURL();
            String trustRoot = url.substring(0, url.indexOf("/", 9));
            String realm = url.substring(0, url.lastIndexOf("/"));
            String returnTo = url.toString();            
            if(_relyingParty.associateAndAuthenticate(user, request, response, trustRoot, realm, 
                    returnTo))
            {
                // successful association
                return;
            }          
        }
        catch(UnknownHostException uhe)
        {
            System.err.println("not found");
            errorMsg = OpenIdServletFilter.ID_NOT_FOUND_MSG;//TODO error pages, massage not passed to front end
        }
        catch(FileNotFoundException fnfe)
        {
            System.err.println("could not be resolved");
            errorMsg = OpenIdServletFilter.DEFAULT_ERROR_MSG;//TODO error pages, massage not passed to front end
        }
        catch(Exception e)
        {
            e.printStackTrace();
            errorMsg = OpenIdServletFilter.DEFAULT_ERROR_MSG;//TODO error pages, massage not passed to front end
        }
        request.setAttribute(OpenIdServletFilter.ERROR_MSG_ATTR, errorMsg);//TODO error pages, massage not passed to front end
        request.getRequestDispatcher("/home/login.html").forward(request, response);
    }

}