From 392f9952cd596b899719a9990079c92d34f8fea3 Mon Sep 17 00:00:00 2001
From: Greg Edwards <edwardsgreg@gmail.com>
Date: Mon, 28 Apr 2014 02:54:01 -0400
Subject: [PATCH] Enforce species, level, and gender requirements serverside.

---
 gts/pokemondpds.ashx.cs            |  7 +++++++
 library/Structures/GtsDatagram4.cs | 19 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/gts/pokemondpds.ashx.cs b/gts/pokemondpds.ashx.cs
index 61795577..6c08bc08 100644
--- a/gts/pokemondpds.ashx.cs
+++ b/gts/pokemondpds.ashx.cs
@@ -349,6 +349,13 @@ namespace PokeFoundations.GTS
                         int targetPid = BitConverter.ToInt32(data, 296);
                         GtsDatagram4 result = DataAbstract.Instance.GtsDataForUser4(targetPid);
 
+                        // enforce request requirements server side
+                        if (!upload.CanTrade(result))
+                        {
+                            Error400(context);
+                            return;
+                        }
+
                         // todo: maybe strong type this
                         object[] tag = new object[2];
                         tag[0] = upload;
diff --git a/library/Structures/GtsDatagram4.cs b/library/Structures/GtsDatagram4.cs
index b75d9a62..337afb1a 100644
--- a/library/Structures/GtsDatagram4.cs
+++ b/library/Structures/GtsDatagram4.cs
@@ -150,6 +150,19 @@ namespace PokeFoundations.Structures
             return new GtsDatagram4(Save());
         }
 
+        public bool CanTrade(GtsDatagram4 other)
+        {
+            if (Species != other.RequestedSpecies) return false;
+            if (other.RequestedGender != Genders.Either && Gender != other.RequestedGender) return false;
+            if (CheckLevels(other.RequestedMinLevel, other.RequestedMaxLevel, Level)) return false;
+            
+            if (RequestedSpecies != other.Species) return false;
+            if (RequestedGender != Genders.Either && other.Gender != RequestedGender) return false;
+            if (CheckLevels(RequestedMinLevel, RequestedMaxLevel, other.Level)) return false;
+
+            return true;
+        }
+
         public void FlagTraded(GtsDatagram4 other)
         {
             Species = other.Species;
@@ -165,6 +178,12 @@ namespace PokeFoundations.Structures
             IsExchanged = 0x01;
         }
 
+        public static bool CheckLevels(byte min, byte max, byte other)
+        {
+            if (max == 0) max = 255;
+            return other >= min && other <= max;
+        }
+
         public static DateTime ? TimestampToDate(ulong timestamp)
         {
             if (timestamp == 0) return null;