FTP File Upload with HTTP Proxy

Question

Is there a way to upload a file to a FTP server when behind an HTTP proxy ?

It seems that uploading a file is not supported behind an HTTP Proxy using .Net Webclient

Answer 1

Damn these unfree applications and components!!! Here is my open source C# code that can uploads file to FTP via HTTP proxy.

        public bool UploadFile(string localFilePath, string remoteDirectory)
    {
        var fileName = Path.GetFileName(localFilePath);
        string content;
        using (var reader = new StreamReader(localFilePath))
            content = reader.ReadToEnd();

        var proxyAuthB64Str = Convert.ToBase64String(Encoding.ASCII.GetBytes(_proxyUserName + ":" + _proxyPassword));
        var sendStr = "PUT ftp://" + _ftpLogin + ":" + _ftpPassword
            + "@" + _ftpHost + remoteDirectory + fileName + " HTTP/1.1\n"
            + "Host: " + _ftpHost + "\n"
            + "User-Agent: Mozilla/4.0 (compatible; Eradicator; dotNetClient)\n" + "Proxy-Authorization: Basic " + proxyAuthB64Str + "\n"
            + "Content-Type: application/octet-stream\n"
            + "Content-Length: " + content.Length + "\n"
            + "Connection: close\n\n" + content;

        var sendBytes = Encoding.ASCII.GetBytes(sendStr);

        using (var proxySocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        {
            proxySocket.Connect(_proxyHost, _proxyPort);
            if (!proxySocket.Connected)
                throw new SocketException();
            proxySocket.Send(sendBytes);

            const int recvSize = 65536;
            var recvBytes = new byte[recvSize];
            proxySocket.Receive(recvBytes, recvSize, SocketFlags.Partial);

            var responseFirstLine = new string(Encoding.ASCII.GetChars(recvBytes)).Split("\n".ToCharArray()).Take(1).ElementAt(0);
            var httpResponseCode = Regex.Replace(responseFirstLine, @"HTTP/1\.\d (\d+) (\w+)", "$1");
            var httpResponseDescription = Regex.Replace(responseFirstLine, @"HTTP/1\.\d (\d+) (\w+)", "$2");
            return httpResponseCode.StartsWith("2");
        }
        return false;
    }