/***********************************************************************
 * 
 *  Copyright (C) 2005-2006 Novell, Inc. All Rights Reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; version 2.1
 *  of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, Novell, Inc.
 * 
 *  To contact Novell about this file by physical or electronic mail, 
 *  you may find current contact information at www.novell.com.
 * 
 ***********************************************************************/

using System;
using System.Collections;
using System.Text;
using System.Threading;
using sscs.verbs;
using sscs.cache;
using sscs.common;
using sscs.constants;
namespace sscs.verbs 
{
    
   /*
    * This class is implementation of ReadSecret call.
    * There will be one instance existing for every call made by the client.  
    */

    internal class ReadSecret : SSVerb
    {
        private ushort msgId = 0;
        private uint inMsgLen  = 0;
        private uint outMsgLen = 0;
        private uint keyChainIdLen = 0;
        private uint secretIdLen = 0;
        private uint secretValLen = 0;
        private int retCode = 0;
        private string keyChainId;
        private string secretId;
        //private byte[] secretVal;
        
        private byte[] inBuf;
        private byte[] outBuf;

        /*
        * This method sets the class member with the byte array received.
        */
 
        public void SetMessageContent(byte[] ipcBytes)
        {
           CSSSLogger.ExecutionTrace(this);
           inBuf = ipcBytes;                   
        }

       /*
        * This method does the actual implementation of ReadSecret 
        *   
        */

        public byte[] ProcessRequest(UserIdentifier userId)
        {

            Secret secret = null;

            CSSSLogger.ExecutionTrace(this); 

            /* If an exception occurs in message format decoding,
             * it is handled by AppHandler
             */

            // Message Format decipher - Start
            msgId          = BitConverter.ToUInt16(inBuf,0);
            inMsgLen       = BitConverter.ToUInt32(inBuf,2);

            if( inMsgLen != inBuf.Length )
                throw new FormatException(" MsgLen sent does not match the length of the message received.");
          
            keyChainIdLen  = BitConverter.ToUInt32(inBuf,6);
 
            byte[] keyChainIdArr = new byte[keyChainIdLen];
            Array.Copy(inBuf,10,keyChainIdArr,0,keyChainIdLen);
            keyChainId     = Encoding.UTF8.GetString(keyChainIdArr);

            secretIdLen    = BitConverter.ToUInt32(inBuf,
                             (10 + (int)keyChainIdLen));

            byte[] secretIdArr = new byte[secretIdLen];
            Array.Copy(inBuf,(10+keyChainIdLen+4),secretIdArr,0,secretIdLen);
            secretId = Encoding.UTF8.GetString(secretIdArr);
            // Message Format decipher - End
 
            try
            {
                KeyChain keyChain = null;
               // Secret secret = null;
                SecretStore ssStore = SessionManager.GetUserSecretStore(userId);

				if (!ssStore.IsStoreLocked())
				{
					if( ssStore.CheckIfKeyChainExists(keyChainId) )
					{
						keyChain = ssStore.GetKeyChain(keyChainId);
						if( keyChain.CheckIfSecretExists(secretId) == false)
						{
							retCode = IPCRetCodes.SSCS_E_SECRETID_DOES_NOT_EXIST;
						}
						else
						{
							secret = keyChain.GetSecret(secretId);
						}
					}
					else
					{
						retCode = IPCRetCodes.SSCS_E_KEYCHAIN_DOES_NOT_EXIST;
					}
				}
				else
					retCode = IPCRetCodes.SSCS_E_SECRETID_DOES_NOT_EXIST;

            }
            catch(UserNotInSessionException)
            {
                CSSSLogger.DbgLog("In " + CSSSLogger.GetExecutionPath(this) + " Unable user's secretstore" );
                retCode = IPCRetCodes.SSCS_E_SYSTEM_ERROR;
            }
            catch(Exception e)
            {
                CSSSLogger.ExpLog(e.ToString()); 
                retCode = IPCRetCodes.SSCS_E_SYSTEM_ERROR;
            }

            try
            {   
                msgId = 8;
                uint secretValLen = 0;
				byte[] baSecretValue = new byte[0];

                if( 0 == retCode )
                {
					baSecretValue = secret.GetValue(secretId);
                    secretValLen = (uint)baSecretValue.Length;
                    outMsgLen = 14 + secretValLen;
                }
                else
                {
                    outMsgLen = 14; //2+4+4+4
                }

                outBuf = new byte[outMsgLen];
                byte[] t = new byte[10];

                t = BitConverter.GetBytes((ushort)msgId);
                Array.Copy(t,0,outBuf,0,2);
 
                t = BitConverter.GetBytes((uint)outMsgLen);
                Array.Copy(t,0,outBuf,2,4);

                t = BitConverter.GetBytes(secretValLen);
                Array.Copy(t,0,outBuf,6,4);
      
               if( 0 == retCode )
                   Array.Copy(baSecretValue,0,outBuf,10,secretValLen);

                t = BitConverter.GetBytes(retCode);
                Array.Copy(t,0,outBuf,10+secretValLen,4);
            }
            catch(Exception e)
            {
                CSSSLogger.ExpLog(e.ToString());
                throw new FormatException("Unable to form the response " + e.ToString());
            }    
             
            return outBuf;

        }

        /*
         * Gives the name of operation performed. Will be used in case 
         * of error. 
         */
        public string GetVerbName()
        {
            CSSSLogger.ExecutionTrace(this);
            return this.ToString(); 
        }
    }
}