SharpHSQL - An SQL engine written in C#

/*
 * User.cs
 *
 * Copyright (c) 2001, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This package is based on HypersonicSQL, originally developed by Thomas Mueller.
 *
 * C# port by Mark Tutt
 *
 */
namespace SharpHSQL
{
	using System;
	using System.Collections;

	/**
	 * Class declaration
	 *
	 *
	 * @version 1.0.0.1
	 */
	class User 
	{
		private bool      bAdministrator;
		private           Hashtable hRight;
		private string    sName, sPassword;
		private User      uPublic;

		/**
		 * Constructor declaration
		 *
		 *
		 * @param name
		 * @param password
		 * @param admin
		 * @param pub
		 */
		public User(string name, string password, bool admin, User pub) 
		{
			hRight = new Hashtable();
			sName = name;

			setPassword(password);

			bAdministrator = admin;
			uPublic = pub;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @return
		 */
		public string getName() 
		{
			return sName;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @return
		 */
		public string getPassword() 
		{

			// necessary to create the script
			return sPassword;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @return
		 */
		public Hashtable getRights() 
		{

			// necessary to create the script
			return hRight;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param password
		 */
		public void setPassword(string password) 
		{
			sPassword = password;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param test
		 *
		 * @throws Exception
		 */
		public void checkPassword(string test) 
		{
			Trace.check(test.Equals(sPassword), Trace.ACCESS_IS_DENIED);

			// this is a safer (but slower) version:
			// if the password is not over 64 characters then this
			// algorithm needs always about the same amount of time

			/*
			 * int maxtest=test.Length();
			 * int maxpass=sPassword.Length();
			 * int max=64;
			 * if(maxtest>max) {
			 * max=maxtest;
			 * }
			 * if(maxpass>max) {
			 * max=maxpass;
			 * }
			 * bool correct=true,dummy=true;
			 * for(int i=0;i<max;i++) {
			 * char a= (i>=maxtest) ? 0 : test.charAt(i);
			 * char b= (i>=maxpass) ? 0 : sPassword.charAt(i);
			 * if(a!=b) {
			 * correct=false;
			 * } else {
			 * dummy=true;
			 * }
			 * }
			 * Trace.check(correct,Trace.ACCESS_IS_DENIED);
			 */
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param object
		 * @param right
		 */
		public void grant(string dbobject, int right) 
		{
			int n;

			if (!hRight.ContainsKey(dbobject)) 
			{
				n = right;
			} 
			else 
			{
				n = (int) hRight[dbobject];
				n = (n | right);
			}

			hRight.Add(dbobject, n);
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param object
		 * @param right
		 */
		public void revoke(string dbobject, int right) 
		{
			int n;

			if (!hRight.ContainsKey(dbobject)) 
			{
				n = right;
			} 
			else 
			{
				n = (int) hRight[dbobject];
				n = (n & (Access.ALL - right));
			}

			hRight.Add(dbobject, n);
		}

		/**
		 * Method declaration
		 *
		 */
		public void revokeAll() 
		{
			hRight = null;
			bAdministrator = false;
		}

		/**
		 * Method declaration
		 *
		 *
		 * @param object
		 * @param right
		 *
		 * @throws Exception
		 */
		public void check(string dbobject, int right) 
		{
			if (bAdministrator) 
			{
				return;
			}

			int n;

			n = (int) hRight[dbobject];

			if ((n & right) != 0) 
			{
				return;
			}

			if (uPublic != null) 
			{
				n = (int) (uPublic.hRight)[dbobject];

				if ((n & right) != 0) 
				{
					return;
				}
			}

			throw Trace.error(Trace.ACCESS_IS_DENIED);
		}

		/**
		 * Method declaration
		 *
		 *
		 * @throws Exception
		 */
		public void checkAdmin() 
		{
			Trace.check(isAdmin(), Trace.ACCESS_IS_DENIED);
		}

		/**
		 * Method declaration
		 *
		 *
		 * @return
		 */
		public bool isAdmin() 
		{
			return bAdministrator;
		}

	}
}