/*
    * Copyright 2001-2004 The Apache Software Foundation.
    * 
    * 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 org.apache.juddi.function;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.juddi.auth.Authenticator;
  import org.apache.juddi.auth.AuthenticatorFactory;
  import org.apache.juddi.datastore.DataStore;
  import org.apache.juddi.datastore.DataStoreFactory;
  import org.apache.juddi.datatype.RegistryObject;
  import org.apache.juddi.datatype.publisher.Publisher;
  import org.apache.juddi.datatype.request.AuthInfo;
  import org.apache.juddi.datatype.request.GetAuthToken;
  import org.apache.juddi.datatype.response.AuthToken;
  import org.apache.juddi.error.RegistryException;
  import org.apache.juddi.error.UnknownUserException;
  import org.apache.juddi.registry.RegistryEngine;
  import org.apache.juddi.util.Config;
  
  /***
   * @author Steve Viens (sviens@apache.org)
   */
  public class GetAuthTokenFunction extends AbstractFunction
  {
    // private reference to jUDDI Logger
    private static Log log = LogFactory.getLog(GetAuthTokenFunction.class);
  
    /***
     *
     */
    public GetAuthTokenFunction(RegistryEngine registry)
    {
      super(registry);
    }
  
    /***
     *
     */
    public RegistryObject execute(RegistryObject regObject)
      throws RegistryException
    {
      GetAuthToken request = (GetAuthToken)regObject;
      String generic = request.getGeneric();
      String userID = request.getUserID();
      String cred = request.getCredential();
  
      // aquire a jUDDI datastore instance
      DataStore dataStore = DataStoreFactory.getDataStore();
  
      // aquire a jUDDI Authenticator instance
      Authenticator authenticator = AuthenticatorFactory.getAuthenticator();
  
      try
      {
        // begin this transaction
        dataStore.beginTrans();
  
        // authenticate the requestor's credentials
        String publisherID = authenticator.authenticate(userID,cred);
        if (publisherID == null)
          throw new UnknownUserException("get_authToken: "+
              "userID="+userID);
  
        // ensure the user has the authority to publish
        Publisher publisher = dataStore.getPublisher(publisherID);
        if (publisher == null)
          throw new UnknownUserException("get_authToken: "+
              "userID="+userID);
  
        // generate a new token (optionally using publisher info)
        String token = dataStore.generateToken(publisher);
  
        // save auth token value to persistent storage
        dataStore.storeAuthToken(token,publisher);
  
        // commit this transaction
        dataStore.commit();
  
        // create, populate and return an AuthToken object
        AuthToken authToken = new AuthToken();
        authToken.setGeneric(generic);
        authToken.setOperator(Config.getOperator());
        authToken.setAuthInfo(new AuthInfo(token));
        return authToken;
      }
     catch(UnknownUserException ukuex)
     {
       try { dataStore.rollback(); } catch(Exception e) { }
       log.info(ukuex.getMessage());
       throw (RegistryException)ukuex;
     }
     catch(RegistryException regex)
     {
       try { dataStore.rollback(); } catch(Exception e) { }
       log.error(regex);
       throw (RegistryException)regex;
     }
     catch(Exception ex)
     {
       try { dataStore.rollback(); } catch(Exception e) { }
       log.error(ex);
       throw new RegistryException(ex);
     }
     finally 
     {
       if (dataStore != null)
         dataStore.release();
     }
   }
 
 
   /****************************************************************************/
   /****************************** TEST DRIVER *********************************/
   /****************************************************************************/
 
 
   public static void main(String[] args)
   {
     // initialize the registry
     RegistryEngine reg = new RegistryEngine();
     reg.init();
 
     try
     {
       // valid request
       GetAuthToken request = new GetAuthToken("sviens","password");
       AuthToken response = (AuthToken)(new GetAuthTokenFunction(reg).execute(request));
       System.out.println("Function: getAuthToken(sviens/password)");
       System.out.println(" AuthInfo: "+response.getAuthInfo());
 
       // invalid (unknown user) request
       request = new GetAuthToken("jdoe","password");
       System.out.println("Function: getAuthToken(jdoe/password)");
       response = (AuthToken)(new GetAuthTokenFunction(reg).execute(request));
       System.out.println(" AuthInfo: "+response.getAuthInfo());
 
       // invalid (invalid credential) request
       request = new GetAuthToken("guest","password");
       System.out.println("Function: getAuthToken(guest/password)");
       response = (AuthToken)(new GetAuthTokenFunction(reg).execute(request));
       System.out.println(" AuthInfo: "+response.getAuthInfo());
     }
     catch (Exception ex)
     {
       // write execption to the console
       ex.printStackTrace();
     }
     finally
     {
       // destroy the registry
       reg.dispose();
     }
   }
 }