littleshop/TeleBot/TeleBot/Http/Socks5HttpHandler.cs

using System;
using System.Net;
using System.Net.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace TeleBot.Http
{
    /// <summary>
    /// Factory for creating HTTP handlers that route traffic through a SOCKS5 proxy (e.g., TOR).
    /// Uses native .NET 9.0 SOCKS5 support for maximum security and reliability.
    /// </summary>
    public class Socks5HttpHandler
    {
        /// <summary>
        /// Creates an HttpMessageHandler configured with TOR proxy if enabled in configuration
        /// </summary>
        public static SocketsHttpHandler Create(IConfiguration configuration, ILogger? logger = null)
        {
            var torEnabled = configuration.GetValue<bool>("Privacy:EnableTor");

            if (torEnabled)
            {
                var torSocksPort = configuration.GetValue<int>("Privacy:TorSocksPort", 9050);
                var proxyUri = $"socks5://127.0.0.1:{torSocksPort}";

                logger?.LogInformation("SOCKS5 proxy configured: {ProxyUri} (TOR enabled)", proxyUri);

                // Configure SOCKS5 proxy using native .NET support
                return new SocketsHttpHandler
                {
                    Proxy = new WebProxy(proxyUri)
                    {
                        BypassProxyOnLocal = false, // Force all traffic through TOR
                        UseDefaultCredentials = false
                    },
                    UseProxy = true,
                    AllowAutoRedirect = false, // Prevent redirect-based deanonymization
                    MaxAutomaticRedirections = 0,
                    PooledConnectionLifetime = TimeSpan.FromMinutes(5), // Rotate circuits
                    PooledConnectionIdleTimeout = TimeSpan.FromMinutes(2)
                };
            }
            else
            {
                // TOR disabled - use direct connection
                logger?.LogWarning("TOR is DISABLED - all traffic will expose real IP address");
                return new SocketsHttpHandler();
            }
        }

        /// <summary>
        /// Factory method to create handler with TOR enabled
        /// </summary>
        public static SocketsHttpHandler CreateWithTor(int torSocksPort = 9050, ILogger? logger = null)
        {
            var proxyUri = $"socks5://127.0.0.1:{torSocksPort}";
            logger?.LogInformation("SOCKS5 proxy configured: {ProxyUri}", proxyUri);

            return new SocketsHttpHandler
            {
                Proxy = new WebProxy(proxyUri)
                {
                    BypassProxyOnLocal = false,
                    UseDefaultCredentials = false
                },
                UseProxy = true,
                AllowAutoRedirect = false,
                PooledConnectionLifetime = TimeSpan.FromMinutes(5),
                PooledConnectionIdleTimeout = TimeSpan.FromMinutes(2)
            };
        }

        /// <summary>
        /// Factory method to create handler without TOR (direct connection)
        /// </summary>
        public static SocketsHttpHandler CreateDirect(ILogger? logger = null)
        {
            logger?.LogWarning("Creating direct HTTP handler - no proxy");
            return new SocketsHttpHandler();
        }
    }
}