* Added Expression based ignores to the PropertyScrambler, which makes a lot of the tests clearer because I'm not constantly resetting properties.

1 files changed, 159 insertions, 0 deletions

diff --git a/OpenSim/Data/Tests/PropertyScrambler.cs b/OpenSim/Data/Tests/PropertyScrambler.cs
new file mode 100644
index 0000000..c56c10f
--- /dev/null
+++ b/OpenSim/Data/Tests/PropertyScrambler.cs
@@ -0,0 +1,159 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Text;
+using NUnit.Framework;
+using NUnit.Framework.SyntaxHelpers;
+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");
+            new PropertyScrambler<AssetBase>().Scramble(actual);
+        }
+
+        [Test]
+        public void DontScramble()
+        {
+            UUID uuid = UUID.Random();
+            AssetBase asset = new AssetBase();
+            asset.FullID = uuid;
+            new PropertyScrambler<AssetBase>()
+                .DontScramble(x => x.Metadata)
+                .DontScramble(x => x.FullID)
+                .DontScramble(x => x.ID)
+                .Scramble(asset);
+            Assert.That(asset.FullID, Is.EqualTo(uuid));
+        }
+    }
+}
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