From af139955a4f896c7da57269efa60909f9fcd98df Mon Sep 17 00:00:00 2001
From: kosipov <mail@kosipov.ru>
Date: Thu, 9 Apr 2026 20:41:17 +0300
Subject: [PATCH] Add README and build scripts

---
 Program.cs | 10 ++++++++++
 run.bat    |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/Program.cs b/Program.cs
index ad8067d..6c5c700 100644
--- a/Program.cs
+++ b/Program.cs
@@ -16,6 +16,10 @@ class Program
     static string PASS = "pass";
     static readonly string UPSTREAM_USER = Environment.GetEnvironmentVariable("UPSTREAM_USER");
     static readonly string UPSTREAM_PASS = Environment.GetEnvironmentVariable("UPSTREAM_PASS");
+    static readonly bool UPSTREAM_ALLOW_EMPTY_PASSWORD = string.Equals(
+        Environment.GetEnvironmentVariable("UPSTREAM_ALLOW_EMPTY_PASSWORD"),
+        "1",
+        StringComparison.OrdinalIgnoreCase);
     static readonly string UPSTREAM_PROXY_AUTH_HEADER = BuildUpstreamProxyAuthHeader();
     static long _connectionSeq;
 
@@ -363,6 +367,12 @@ class Program
         if (string.IsNullOrWhiteSpace(UPSTREAM_USER))
             return string.Empty;
 
+        if (string.IsNullOrEmpty(UPSTREAM_PASS) && !UPSTREAM_ALLOW_EMPTY_PASSWORD)
+        {
+            Log.Info("UPSTREAM_PASS is empty; upstream Basic auth header is disabled");
+            return string.Empty;
+        }
+
         string pass = UPSTREAM_PASS ?? string.Empty;
         string encoded = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{UPSTREAM_USER}:{pass}"));
         return $"Proxy-Authorization: Basic {encoded}\r\n";
diff --git a/run.bat b/run.bat
index b615fa5..bdb2d98 100644
--- a/run.bat
+++ b/run.bat
@@ -12,10 +12,12 @@ if not exist "%EXE%" (
 set "UPSTREAM_PROXY=proxy.syktsu.ru:3128"
 set "UPSTREAM_USER=%USERNAME%"
 set "UPSTREAM_PASS="
+set "UPSTREAM_ALLOW_EMPTY_PASSWORD=0"
 
 echo [run] UPSTREAM_PROXY=%UPSTREAM_PROXY%
 echo [run] UPSTREAM_USER=%UPSTREAM_USER%
 echo [run] UPSTREAM_PASS is empty
+echo [run] UPSTREAM_ALLOW_EMPTY_PASSWORD=%UPSTREAM_ALLOW_EMPTY_PASSWORD%
 echo [run] Starting proxy...
 
 "%EXE%"