From 29d8e0c9b74e2fa0f48d456d34ecbb0cbfcba0ec Mon Sep 17 00:00:00 2001
From: Halil Durak <halildrk@gmail.com>
Date: Fri, 17 Apr 2026 17:32:05 +0300
Subject: [PATCH] `Config`: bring back `validateUserAgent`

---
 src/Config.zig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Config.zig b/src/Config.zig
index 286171d3..1a5bc3ee 100644
--- a/src/Config.zig
+++ b/src/Config.zig
@@ -653,3 +653,15 @@ pub fn parseArgs(allocator: Allocator) !Config {
     const exec_name, const command = try Commands.parse(allocator);
     return .init(allocator, exec_name, command);
 }
+
+pub fn validateUserAgent(ua: []const u8) !void {
+    for (ua) |c| {
+        if (!std.ascii.isPrint(c)) {
+            return error.NonPrintable;
+        }
+    }
+
+    if (std.ascii.indexOfIgnoreCase(ua, "mozilla") != null) {
+        return error.Reserved;
+    }
+}