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362 lines (327 loc) · 11.7 KB
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using System;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
// offered to the public domain for any use with no restriction
// and also with no warranty of any kind, please enjoy. - David Jeske.
// simple HTTP explanation
// http://www.jmarshall.com/easy/http/
namespace SpotifyAPI.Web
{
public class HttpProcessor : IDisposable
{
private const int MaxPostSize = 10 * 1024 * 1024; // 10MB
private const int BufSize = 4096;
private readonly HttpServer _srv;
private Stream _inputStream;
public Hashtable HttpHeaders = new Hashtable();
public string HttpMethod;
public string HttpProtocolVersionstring;
public string HttpUrl;
public StreamWriter OutputStream;
private bool _isActive = true;
public HttpProcessor(HttpServer srv)
{
_srv = srv;
}
private string StreamReadLine(Stream inputStream)
{
string data = "";
while (_isActive)
{
var nextChar = inputStream.ReadByte();
if (nextChar == '\n')
{
break;
}
if (nextChar == '\r')
{
continue;
}
if (nextChar == -1)
{
Thread.Sleep(1);
continue;
}
data += Convert.ToChar(nextChar);
}
return data;
}
public void Process(TcpClient socket)
{
// we can't use a StreamReader for input, because it buffers up extra data on us inside it's
// "processed" view of the world, and we want the data raw after the headers
_inputStream = new BufferedStream(socket.GetStream());
// we probably shouldn't be using a streamwriter for all output from handlers either
OutputStream = new StreamWriter(new BufferedStream(socket.GetStream()));
try
{
ParseRequest();
ReadHeaders();
if (HttpMethod.Equals("GET"))
{
HandleGetRequest();
}
else if (HttpMethod.Equals("POST"))
{
HandlePostRequest();
}
}
catch (Exception ex)
{
WriteFailure();
}
OutputStream.Flush();
_inputStream = null;
OutputStream = null;
socket.Close();
}
public void ParseRequest()
{
string request = StreamReadLine(_inputStream);
string[] tokens = request.Split(' ');
if (tokens.Length < 2)
{
throw new Exception("Invalid HTTP request line");
}
HttpMethod = tokens[0].ToUpper();
HttpUrl = tokens[1];
}
public void ReadHeaders()
{
string line;
while ((line = StreamReadLine(_inputStream)) != null)
{
if (string.IsNullOrEmpty(line))
{
return;
}
int separator = line.IndexOf(':');
if (separator == -1)
{
throw new Exception("Invalid HTTP header line: " + line);
}
string name = line.Substring(0, separator);
int pos = separator + 1;
while ((pos < line.Length) && (line[pos] == ' '))
{
pos++; // strip any spaces
}
string value = line.Substring(pos, line.Length - pos);
HttpHeaders[name] = value;
}
}
public void HandleGetRequest()
{
_srv.HandleGetRequest(this);
}
public void HandlePostRequest()
{
// this post data processing just reads everything into a memory stream.
// this is fine for smallish things, but for large stuff we should really
// hand an input stream to the request processor. However, the input stream
// we hand him needs to let him see the "end of the stream" at this content
// length, because otherwise he won't know when he's seen it all!
MemoryStream ms = new MemoryStream();
if (HttpHeaders.ContainsKey("Content-Length"))
{
var contentLen = Convert.ToInt32(HttpHeaders["Content-Length"]);
if (contentLen > MaxPostSize)
{
throw new Exception($"POST Content-Length({contentLen}) too big for this simple server");
}
byte[] buf = new byte[BufSize];
int toRead = contentLen;
while (toRead > 0)
{
int numread = _inputStream.Read(buf, 0, Math.Min(BufSize, toRead));
if (numread == 0)
{
if (toRead == 0)
{
break;
}
throw new Exception("Client disconnected during post");
}
toRead -= numread;
ms.Write(buf, 0, numread);
}
ms.Seek(0, SeekOrigin.Begin);
}
_srv.HandlePostRequest(this, new StreamReader(ms));
}
public void WriteSuccess(string contentType = "text/html")
{
OutputStream.WriteLine("HTTP/1.0 200 OK");
OutputStream.WriteLine("Content-Type: " + contentType);
OutputStream.WriteLine("Connection: close");
OutputStream.WriteLine("");
}
public void WriteFailure()
{
OutputStream.WriteLine("HTTP/1.0 404 File not found");
OutputStream.WriteLine("Connection: close");
OutputStream.WriteLine("");
}
public void Dispose()
{
_isActive = false;
}
}
public abstract class HttpServer : IDisposable
{
private TcpListener _listener;
protected int Port;
protected HttpServer(int port)
{
IsActive = true;
Port = port;
}
public bool IsActive { get; set; }
public void Dispose()
{
IsActive = false;
_listener.Stop();
GC.SuppressFinalize(this);
}
public void Listen()
{
try
{
_listener = new TcpListener(IPAddress.Any, Port);
_listener.Start();
using (HttpProcessor processor = new HttpProcessor(this))
{
while (IsActive)
{
TcpClient s = _listener.AcceptTcpClient();
processor.Process(s);
}
}
}
catch (SocketException e)
{
if (e.ErrorCode != 10004) //Ignore 10004, which is thrown when the thread gets terminated
throw;
}
}
public abstract void HandleGetRequest(HttpProcessor p);
public abstract void HandlePostRequest(HttpProcessor p, StreamReader inputData);
}
public class AuthEventArgs
{
//Code can be an AccessToken or an Exchange Code
public string Code { get; set; }
public string TokenType { get; set; }
public string State { get; set; }
public string Error { get; set; }
public int ExpiresIn { get; set; }
}
public class SimpleHttpServer : HttpServer
{
private readonly AuthType _type;
public delegate void AuthEventHandler(AuthEventArgs e);
public event AuthEventHandler OnAuth;
public SimpleHttpServer(int port, AuthType type) : base(port)
{
_type = type;
}
public override void HandleGetRequest(HttpProcessor p)
{
p.WriteSuccess();
if (p.HttpUrl == "/favicon.ico")
return;
Thread t;
if (_type == AuthType.Authorization)
{
string url = p.HttpUrl;
url = url.Substring(2, url.Length - 2);
NameValueCollection col = HttpUtility.ParseQueryString(url);
if (col.Keys.Get(0) != "code")
{
p.OutputStream.WriteLine("<html><body><h1>Spotify Auth canceled!</h1></body></html>");
t = new Thread(o =>
{
OnAuth?.Invoke(new AuthEventArgs()
{
State = col.Get(1),
Error = col.Get(0),
});
});
}
else
{
p.OutputStream.WriteLine("<html><body><h1>Spotify Auth successful!</h1><script>window.close();</script></body></html>");
t = new Thread(o =>
{
OnAuth?.Invoke(new AuthEventArgs()
{
Code = col.Get(0),
State = col.Get(1)
});
});
}
}
else
{
if (p.HttpUrl == "/")
{
p.OutputStream.WriteLine("<html><body>" +
"<script>" +
"" +
"var hashes = window.location.hash;" +
"hashes = hashes.replace('#','&');" +
"window.location = hashes" +
"</script>" +
"<h1>Spotify Auth successful!<br>Please copy the URL and paste it into the application</h1></body></html>");
return;
}
string url = p.HttpUrl;
url = url.Substring(2, url.Length - 2);
NameValueCollection col = HttpUtility.ParseQueryString(url);
if (col.Keys.Get(0) != "access_token")
{
p.OutputStream.WriteLine("<html><body><h1>Spotify Auth canceled!</h1></body></html>");
t = new Thread(o =>
{
OnAuth?.Invoke(new AuthEventArgs()
{
Error = col.Get(0),
State = col.Get(1)
});
});
}
else
{
p.OutputStream.WriteLine("<html><body><h1>Spotify Auth successful!</h1><script>window.close();</script></body></html>");
t = new Thread(o =>
{
OnAuth?.Invoke(new AuthEventArgs()
{
Code = col.Get(0),
TokenType = col.Get(1),
ExpiresIn = Convert.ToInt32(col.Get(2)),
State = col.Get(3)
});
});
}
}
t.Start();
}
public override void HandlePostRequest(HttpProcessor p, StreamReader inputData)
{
p.WriteSuccess();
}
}
public enum AuthType
{
Implicit,
Authorization
}
}