public static (int, string) OpenUrl(GopherUri guri)
{
string response = "";
int status = -1;
TcpClient client;
try {
client = new TcpClient(guri.Host, guri.Port);
}
catch (Exception ex) {
response = ex.Message;
status = 100;
return(status, response);
}
client.ReceiveTimeout = client.SendTimeout = CLIENT_TIMEOUT_MS;
using (NetworkStream stream = client.GetStream()) {
try {
string request = guri.Path;
if (!request.Contains("\n"))
{
request += "\n";
}
byte[] requestBytes = Encoding.ASCII.GetBytes(request);
stream.Write(requestBytes, 0, requestBytes.Length);
}
catch (Exception ex) {
response = ex.Message;
status = 200;
return(status, response);
}
Thread.Sleep(SLEEP_BETWEEN_REQ_RESP_MS);
try {
MemoryStream mem = ReadResponse(stream);
if (mem.Length > 0)
{
response = Encoding.ASCII.GetString(mem.ToArray());
status = 0;
}
}
catch (Exception ex) {
response = ex.Message;
status = 300;
return(status, response);
}
}
return(status, response);
}
static void Main(string[] args)
{
Console.WriteLine("Dipper. The sharp# Gopher browser.");
bool run = true;
while (run)
{
Console.Write("> ");
string address = Console.ReadLine();
if (string.IsNullOrWhiteSpace(address))
{
break;
}
GopherUri guri;
try {
guri = GopherUri.Parse(address);
}
catch {
Console.WriteLine(">>> ERROR! Wrong URL!");
continue;
}
(int status, string response) = Downloader.OpenUrl(guri);
if (status == 0)
{
#if DEBUG
string logFilename = $"log-{guri.Host}-{Environment.TickCount}.txt";
File.WriteAllText(logFilename, response);
#endif
if (guri.ItemType == GopherItemType.SubmenuDir)
{
Parser.DrawMenu(response);
}
else
{
Console.WriteLine(response);
}
}
else
{
Console.WriteLine($">>> ERROR {status}!");
Console.WriteLine(response);
}
}
}
public static GopherUri Parse(string raw)
{
if (!raw.StartsWith(GopherScheme))
{
raw = GopherScheme + raw;
}
GopherUri guri = new GopherUri();
var uri = new Uri(raw);
guri.uri = uri;
if (guri.uri.Segments.Length < 2)
{
guri.Path = uri.AbsolutePath;
guri.ItemType = GopherItemType.SubmenuDir;
}
else
{
int gtype = uri.Segments[1][0];
if (Enum.IsDefined(typeof(GopherItemType), gtype))
{
guri.ItemType = (GopherItemType)gtype;
string pathBody = string.Join("", guri.uri.Segments, 2, guri.uri.Segments.Length - 2);
if (uri.Segments[1].Length > 2)
{
guri.Path = $"/{uri.Segments[1].Substring(1)}/{pathBody}";
}
else
{
guri.Path = $"/{pathBody}";
}
}
else
{
guri.Path = uri.AbsolutePath;
guri.ItemType = GopherItemType.SubmenuDir;
}
}
return(guri);
}
