HttpResponse.cs

#region License
/*
 * HttpResponse.cs
 *
 * The MIT License
 *
 * Copyright (c) 2012-2014 sta.blockhead
 * Copyright © 2016 Nivloc Enterprises Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#endregion

using System;
using System.Collections.Specialized;
#if SSHARP
using Crestron.SimplSharp;
using Crestron.SimplSharp.CrestronIO;
using HttpStatusCode = SSMono.Net.HttpStatusCode;
#else
using System.IO;
#endif
using System.Text;
using WebSocketSharp.Net;

namespace WebSocketSharp
	{
	internal class HttpResponse : HttpBase
		{
		#region Private Fields

		private string _code;
		private string _reason;

		#endregion

		#region Private Constructors

		private HttpResponse (string code, string reason, Version version, NameValueCollection headers)
			: base (version, headers)
			{
			_code = code;
			_reason = reason;
			}

		#endregion

		#region Internal Constructors

		internal HttpResponse (HttpStatusCode code)
			: this (code, code.GetDescription ())
			{
			}

		internal HttpResponse (HttpStatusCode code, string reason)
			: this (((int)code).ToString (), reason, HttpVersion.Version11, new NameValueCollection ())
			{
			Headers["Server"] = "websocket-sharp/1.0";
			}

		#endregion

		#region Public Properties

		public CookieCollection Cookies
			{
			get
				{
				return Headers.GetCookies (true);
				}
			}

		public bool HasConnectionClose
			{
			get
				{
				return Headers.Contains ("Connection", "close");
				}
			}

		public bool IsProxyAuthenticationRequired
			{
			get
				{
				return _code == "407";
				}
			}

		public bool IsRedirect
			{
			get
				{
				return _code == "301" || _code == "302";
				}
			}

		public bool IsUnauthorized
			{
			get
				{
				return _code == "401";
				}
			}

		public bool IsWebSocketResponse
			{
			get
				{
				var headers = Headers;
				return ProtocolVersion > HttpVersion.Version10 &&
					   _code == "101" &&
					   headers.Contains ("Upgrade", "websocket") &&
					   headers.Contains ("Connection", "Upgrade");
				}
			}

		public string Reason
			{
			get
				{
				return _reason;
				}
			}

		public string StatusCode
			{
			get
				{
				return _code;
				}
			}

		#endregion

		#region Internal Methods

		internal static HttpResponse CreateCloseResponse (HttpStatusCode code)
			{
			var res = new HttpResponse (code);
			res.Headers["Connection"] = "close";

			return res;
			}

		internal static HttpResponse CreateUnauthorizedResponse (string challenge)
			{
			var res = new HttpResponse (HttpStatusCode.Unauthorized);
			res.Headers["WWW-Authenticate"] = challenge;

			return res;
			}

		internal static HttpResponse CreateWebSocketResponse ()
			{
			var res = new HttpResponse (HttpStatusCode.SwitchingProtocols);

			var headers = res.Headers;
			headers["Upgrade"] = "websocket";
			headers["Connection"] = "Upgrade";

			return res;
			}

		internal static HttpResponse Parse (string[] headerParts)
			{
			var statusLine = headerParts[0].Split (new[] { ' ' }, 3);
			if (statusLine.Length != 3)
				throw new ArgumentException ("Invalid status line: " + headerParts[0]);

			var headers = new WebHeaderCollection ();
			for (int i = 1; i < headerParts.Length; i++)
				headers.InternalSet (headerParts[i], true);

			return new HttpResponse (
			  statusLine[1], statusLine[2], new Version (statusLine[0].Substring (5)), headers);
			}

		internal static HttpResponse Read (Stream stream, int millisecondsTimeout)
			{
			return Read<HttpResponse> (stream, Parse, millisecondsTimeout);
			}

		#endregion

		#region Public Methods

		public void SetCookies (CookieCollection cookies)
			{
			if (cookies == null || cookies.Count == 0)
				return;

			var headers = Headers;
			foreach (var cookie in cookies.Sorted)
				headers.Add ("Set-Cookie", cookie.ToResponseString ());
			}

		public override string ToString ()
			{
			var output = new StringBuilder (64);
			output.AppendFormat ("HTTP/{0} {1} {2}{3}", ProtocolVersion, _code, _reason, CrLf);

			var headers = Headers;
			foreach (var key in headers.AllKeys)
				output.AppendFormat ("{0}: {1}{2}", key, headers[key], CrLf);

			output.Append (CrLf);

			var entity = EntityBody;
			if (entity.Length > 0)
				output.Append (entity);

			return output.ToString ();
			}

		#endregion
		}
	}