/* * Copyright (c) Contributors, http://opensimulator.org/ * See CONTRIBUTORS.TXT for a full list of copyright holders. * * 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 OpenSimulator Project 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 DEVELOPERS ``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 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. */ using System; using System.Collections; using System.Collections.Generic; using System.Linq.Expressions; using System.Reflection; using System.Text; using NUnit.Framework; using OpenMetaverse; using OpenSim.Framework; namespace OpenSim.Data.Tests { //This is generic so that the lambda expressions will work right in IDEs. public class PropertyScrambler<T> { readonly System.Collections.Generic.List<string> membersToNotScramble = new List<string>(); private void AddExpressionToNotScrableList(Expression expression) { UnaryExpression unaryExpression = expression as UnaryExpression; if (unaryExpression != null) { AddExpressionToNotScrableList(unaryExpression.Operand); return; } MemberExpression memberExpression = expression as MemberExpression; if (memberExpression != null) { if (!(memberExpression.Member is PropertyInfo)) { throw new NotImplementedException("I don't know how deal with a MemberExpression that is a " + expression.Type); } membersToNotScramble.Add(memberExpression.Member.Name); return; } throw new NotImplementedException("I don't know how to parse a " + expression.Type); } public PropertyScrambler<T> DontScramble(Expression<Func<T, object>> expression) { AddExpressionToNotScrableList(expression.Body); return this; } public void Scramble(T obj) { internalScramble(obj); } private void internalScramble(object obj) { PropertyInfo[] properties = obj.GetType().GetProperties(); foreach (var property in properties) { //Skip indexers of classes. We will assume that everything that has an indexer // is also IEnumberable. May not always be true, but should be true normally. if (property.GetIndexParameters().Length > 0) continue; RandomizeProperty(obj, property, null); } //Now if it implments IEnumberable, it's probably some kind of list, so we should randomize // everything inside of it. IEnumerable enumerable = obj as IEnumerable; if (enumerable != null) { foreach (object value in enumerable) { internalScramble(value); } } } private readonly Random random = new Random(); private void RandomizeProperty(object obj, PropertyInfo property, object[] index) {//I'd like a better way to compare, but I had lots of problems with InventoryFolderBase because the ID is inherited. if (membersToNotScramble.Contains(property.Name)) return; Type t = property.PropertyType; if (!property.CanWrite) return; object value = property.GetValue(obj, index); if (value == null) return; if (t == typeof(string)) property.SetValue(obj, RandomName(), index); else if (t == typeof(UUID)) property.SetValue(obj, UUID.Random(), index); else if (t == typeof(sbyte)) property.SetValue(obj, (sbyte)random.Next(sbyte.MinValue, sbyte.MaxValue), index); else if (t == typeof(short)) property.SetValue(obj, (short)random.Next(short.MinValue, short.MaxValue), index); else if (t == typeof(int)) property.SetValue(obj, random.Next(), index); else if (t == typeof(long)) property.SetValue(obj, random.Next() * int.MaxValue, index); else if (t == typeof(byte)) property.SetValue(obj, (byte)random.Next(byte.MinValue, byte.MaxValue), index); else if (t == typeof(ushort)) property.SetValue(obj, (ushort)random.Next(ushort.MinValue, ushort.MaxValue), index); else if (t == typeof(uint)) property.SetValue(obj, Convert.ToUInt32(random.Next()), index); else if (t == typeof(ulong)) property.SetValue(obj, Convert.ToUInt64(random.Next()) * Convert.ToUInt64(UInt32.MaxValue), index); else if (t == typeof(bool)) property.SetValue(obj, true, index); else if (t == typeof(byte[])) { byte[] bytes = new byte[30]; random.NextBytes(bytes); property.SetValue(obj, bytes, index); } else internalScramble(value); } private string RandomName() { StringBuilder name = new StringBuilder(); int size = random.Next(5, 12); for (int i = 0; i < size; i++) { char ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65))); name.Append(ch); } return name.ToString(); } } [TestFixture] public class PropertyScramblerTests { [Test] public void TestScramble() { AssetBase actual = new AssetBase(UUID.Random(), "asset one", (sbyte)AssetType.Texture, UUID.Zero.ToString()); new PropertyScrambler<AssetBase>().Scramble(actual); } [Test] public void DontScramble() { UUID uuid = UUID.Random(); AssetBase asset = new AssetBase(uuid, "asset", (sbyte)AssetType.Texture, UUID.Zero.ToString()); new PropertyScrambler<AssetBase>() .DontScramble(x => x.Metadata) .DontScramble(x => x.FullID) .DontScramble(x => x.ID) .Scramble(asset); Assert.That(asset.FullID, Is.EqualTo(uuid)); } } }