ListenerPrefix.cs

//
// System.Net.ListenerPrefix
//
// Author:
//	Gonzalo Paniagua Javier (gonzalo@novell.com)
//	Oleg Mihailik (mihailik gmail co_m)
//
// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
// Copyright (c) 2018 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.
//


#if SECURITY_DEP
using System;
#if SSHARP
using Crestron.SimplSharp;
#else
#endif

#if SSHARP
namespace SSMono.Net
#else
namespace System.Net
#endif
	{
	internal sealed class ListenerPrefix
		{
		private string original;
		private string host;
		private ushort port;
		private string path;
		private bool secure;
		private IPAddress[] addresses;
		public HttpListener Listener;

		public ListenerPrefix (string prefix)
			{
			this.original = prefix;
			Parse (prefix);
			}

		public override string ToString ()
			{
			return original;
			}

		public IPAddress[] Addresses
			{
			get { return addresses; }
			set { addresses = value; }
			}

		public bool Secure
			{
			get { return secure; }
			}

		public string Host
			{
			get { return host; }
			}

		public int Port
			{
			get { return (int)port; }
			}

		public string Path
			{
			get { return path; }
			}

		// Equals and GetHashCode are required to detect duplicates in HttpListenerPrefixCollection.
		public override bool Equals (object o)
			{
			ListenerPrefix other = o as ListenerPrefix;
			if (other == null)
				return false;

			return (original == other.original);
			}

		public override int GetHashCode ()
			{
			return original.GetHashCode ();
			}

		private void Parse (string uri)
			{
			ushort default_port = 80;
			if (uri.StartsWith ("https://"))
				{
				default_port = 443;
				secure = true;
				}

			int length = uri.Length;
			int start_host = uri.IndexOf (':') + 3;
			if (start_host >= length)
				throw new ArgumentException ("No host specified.");

			int colon = uri.IndexOf (':', start_host, length - start_host);
			int root;
			if (colon > 0)
				{
				host = uri.Substring (start_host, colon - start_host);
				root = uri.IndexOf ('/', colon, length - colon);
				port = (ushort)Int32.Parse (uri.Substring (colon + 1, root - colon - 1));
				path = uri.Substring (root);
				}
			else
				{
				root = uri.IndexOf ('/', start_host, length - start_host);
				host = uri.Substring (start_host, root - start_host);
				port = default_port;
				path = uri.Substring (root);
				}
			if (path.Length != 1)
				path = path.Substring (0, path.Length - 1);
			}

		public static void CheckUri (string uri)
			{
			if (uri == null)
				throw new ArgumentNullException ("uriPrefix");

			if (!uri.StartsWith ("http://") && !uri.StartsWith ("https://"))
				throw new ArgumentException ("Only 'http' and 'https' schemes are supported.");

			int length = uri.Length;
			int start_host = uri.IndexOf (':') + 3;
			if (start_host >= length)
				throw new ArgumentException ("No host specified.");

			int colon = uri.IndexOf (':', start_host, length - start_host);
			if (start_host == colon)
				throw new ArgumentException ("No host specified.");

			int root;
			if (colon > 0)
				{
				root = uri.IndexOf ('/', colon, length - colon);
				if (root == -1)
					throw new ArgumentException ("No path specified.");

				try
					{
					int p = Int32.Parse (uri.Substring (colon + 1, root - colon - 1));
					if (p <= 0 || p >= 65536)
						throw new Exception ();
					}
				catch
					{
					throw new ArgumentException ("Invalid port.");
					}
				}
			else
				{
				root = uri.IndexOf ('/', start_host, length - start_host);
				if (root == -1)
					throw new ArgumentException ("No path specified.");
				}

			if (uri[uri.Length - 1] != '/')
				throw new ArgumentException ("The prefix must end with '/'");
			}
		}
	}

#endif