From d3582340b0842f45f4567e227207f72fddc6e8fb Mon Sep 17 00:00:00 2001
From: Hellojack <106379370+H1JK@users.noreply.github.com>
Date: Fri, 10 Jun 2022 14:21:53 +0800
Subject: [PATCH] V2Ray : Support Xray UUIDv5 mapping standard

---
 Netch/Servers/V2ray/V2rayConfigUtils.cs | 13 +++++++++++--
 Netch/Utils/StringExtension.cs          | 26 +++++++++++++++++++++++++
 Tests/Global.cs                         |  2 +-
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/Netch/Servers/V2ray/V2rayConfigUtils.cs b/Netch/Servers/V2ray/V2rayConfigUtils.cs
index 5f98c7f2..05d86073 100644
--- a/Netch/Servers/V2ray/V2rayConfigUtils.cs
+++ b/Netch/Servers/V2ray/V2rayConfigUtils.cs
@@ -82,7 +82,7 @@ public static class V2rayConfigUtils
                         {
                             new User
                             {
-                                id = vless.UserID,
+                                id = getUUID(vless.UserID),
                                 flow = vless.Flow.ValueOrDefault(),
                                 encryption = vless.EncryptMethod
                             }
@@ -125,7 +125,7 @@ public static class V2rayConfigUtils
                         {
                             new User
                             {
-                                id = vmess.UserID,
+                                id = getUUID(vmess.UserID),
                                 alterId = vmess.AlterID,
                                 security = vmess.EncryptMethod
                             }
@@ -366,4 +366,13 @@ public static class V2rayConfigUtils
 
         return streamSettings;
     }
+
+    public static string getUUID(string uuid)
+    {
+        if (uuid.Length == 36 || uuid.Length == 32)
+        {
+            return uuid;
+        }
+        return uuid.GenerateUUIDv5();
+    }
 }
\ No newline at end of file
diff --git a/Netch/Utils/StringExtension.cs b/Netch/Utils/StringExtension.cs
index 8ee4211d..5c38588d 100644
--- a/Netch/Utils/StringExtension.cs
+++ b/Netch/Utils/StringExtension.cs
@@ -78,4 +78,30 @@ public static class StringExtension
     {
         return !string.IsNullOrWhiteSpace(value) ? value.Split(',') : default;
     }
+
+    public static string GenerateUUIDv5(this string str)
+    {
+        // https://github.com/XTLS/Xray-core/discussions/715
+        // https://xray-uuid.ducksoft.site/
+
+        SHA1 sha1 = new SHA1CryptoServiceProvider();
+
+        // example string: "example"
+        List<byte> byteSource = new List<byte>();
+        byteSource.AddRange(new byte[16]);
+        byteSource.AddRange(Encoding.UTF8.GetBytes(str));
+
+        byte[] Sha1Bytes = sha1.ComputeHash(byteSource.ToArray()).Skip(0).Take(16).ToArray();
+        sha1.Dispose();
+
+        //UUIDv5: [254 181 68 49 48 27 82 187 166 221 225 233 62 129 187 158]
+
+        Sha1Bytes[6] = (byte)((Sha1Bytes[6] & 0x0f) | (5 << 4));
+        Sha1Bytes[8] = (byte)(Sha1Bytes[8] & (0xff >> 2) | (0x02 << 6));
+
+        return BitConverter.ToString(Sha1Bytes).Replace("-", "")
+            .Insert(8, "-").Insert(13, "-").Insert(18, "-").Insert(23, "-")
+            .ToLower();
+        //UUIDv5: feb54431-301b-52bb-a6dd-e1e93e81bb9e
+    }
 }
\ No newline at end of file
diff --git a/Tests/Global.cs b/Tests/Global.cs
index 58029899..63d798b7 100644
--- a/Tests/Global.cs
+++ b/Tests/Global.cs
@@ -24,7 +24,7 @@ namespace Tests
             var str = "example";
 
             SHA1 sha1 = new SHA1CryptoServiceProvider();
-            byte[] StrBytes = Encoding.Default.GetBytes(str);
+            byte[] StrBytes = Encoding.UTF8.GetBytes(str);
 
             List<byte> byteSource = new List<byte>();
             byteSource.AddRange(bytes);