//
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// HttpListener.cs
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// Copied from System.Net.HttpListener
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//
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// Author:
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// Gonzalo Paniagua Javier (gonzalo@novell.com)
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//
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// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
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// Copyright (c) 2012 sta.blockhead (sta.blockhead@gmail.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Net;
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using System.Threading;
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// TODO: logging
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namespace WebSocketSharp.Net {
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public sealed class HttpListener : IDisposable {
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#region Fields
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AuthenticationSchemes auth_schemes;
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AuthenticationSchemeSelector auth_selector;
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Dictionary<HttpConnection, HttpConnection> connections;
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List<HttpListenerContext> ctx_queue;
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bool disposed;
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bool ignore_write_exceptions;
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bool listening;
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HttpListenerPrefixCollection prefixes;
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string realm;
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Dictionary<HttpListenerContext, HttpListenerContext> registry;
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bool unsafe_ntlm_auth;
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List<ListenerAsyncResult> wait_queue;
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#endregion
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#region Constructor
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public HttpListener ()
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{
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prefixes = new HttpListenerPrefixCollection (this);
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registry = new Dictionary<HttpListenerContext, HttpListenerContext> ();
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connections = new Dictionary<HttpConnection, HttpConnection> ();
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ctx_queue = new List<HttpListenerContext> ();
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wait_queue = new List<ListenerAsyncResult> ();
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auth_schemes = AuthenticationSchemes.Anonymous;
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}
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#endregion
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#region Properties
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// TODO: Digest, NTLM and Negotiate require ControlPrincipal
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public AuthenticationSchemes AuthenticationSchemes {
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get { return auth_schemes; }
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set {
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CheckDisposed ();
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auth_schemes = value;
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}
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}
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public AuthenticationSchemeSelector AuthenticationSchemeSelectorDelegate {
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get { return auth_selector; }
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set {
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CheckDisposed ();
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auth_selector = value;
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}
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}
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public bool IgnoreWriteExceptions {
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get { return ignore_write_exceptions; }
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set {
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CheckDisposed ();
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ignore_write_exceptions = value;
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}
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}
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public bool IsListening {
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get { return listening; }
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}
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public static bool IsSupported {
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get { return true; }
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}
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public HttpListenerPrefixCollection Prefixes {
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get {
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CheckDisposed ();
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return prefixes;
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}
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}
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// TODO: Use this
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public string Realm {
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get { return realm; }
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set {
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CheckDisposed ();
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realm = value;
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}
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}
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// TODO: Support for NTLM needs some loving.
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public bool UnsafeConnectionNtlmAuthentication {
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get { return unsafe_ntlm_auth; }
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set {
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CheckDisposed ();
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unsafe_ntlm_auth = value;
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}
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}
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#endregion
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#region Private Methods
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void Cleanup (bool close_existing)
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{
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lock (((ICollection)registry).SyncRoot) {
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if (close_existing) {
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// Need to copy this since closing will call UnregisterContext
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ICollection keys = registry.Keys;
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var all = new HttpListenerContext [keys.Count];
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keys.CopyTo (all, 0);
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registry.Clear ();
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for (int i = all.Length - 1; i >= 0; i--)
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all [i].Connection.Close (true);
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}
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lock (((ICollection)connections).SyncRoot) {
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ICollection keys = connections.Keys;
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var conns = new HttpConnection [keys.Count];
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keys.CopyTo (conns, 0);
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connections.Clear ();
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for (int i = conns.Length - 1; i >= 0; i--)
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conns [i].Close (true);
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}
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lock (((ICollection)ctx_queue).SyncRoot) {
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var ctxs = ctx_queue.ToArray ();
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ctx_queue.Clear ();
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for (int i = ctxs.Length - 1; i >= 0; i--)
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ctxs [i].Connection.Close (true);
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}
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lock (((ICollection)wait_queue).SyncRoot) {
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Exception exc = new ObjectDisposedException ("listener");
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foreach (ListenerAsyncResult ares in wait_queue) {
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ares.Complete (exc);
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}
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wait_queue.Clear ();
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}
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}
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}
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void Close (bool force)
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{
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CheckDisposed ();
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EndPointManager.RemoveListener (this);
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Cleanup (force);
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}
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// Must be called with a lock on ctx_queue
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HttpListenerContext GetContextFromQueue ()
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{
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if (ctx_queue.Count == 0)
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return null;
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var context = ctx_queue [0];
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ctx_queue.RemoveAt (0);
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return context;
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}
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void IDisposable.Dispose ()
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{
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if (disposed)
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return;
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Close (true); //TODO: Should we force here or not?
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disposed = true;
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}
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#endregion
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#region Internal Methods
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internal void AddConnection (HttpConnection cnc)
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{
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connections [cnc] = cnc;
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}
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internal void CheckDisposed ()
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().ToString ());
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}
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internal void RegisterContext (HttpListenerContext context)
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{
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lock (((ICollection)registry).SyncRoot)
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registry [context] = context;
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ListenerAsyncResult ares = null;
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lock (((ICollection)wait_queue).SyncRoot) {
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if (wait_queue.Count == 0) {
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lock (((ICollection)ctx_queue).SyncRoot)
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ctx_queue.Add (context);
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} else {
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ares = wait_queue [0];
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wait_queue.RemoveAt (0);
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}
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}
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if (ares != null)
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ares.Complete (context);
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}
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internal void RemoveConnection (HttpConnection cnc)
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{
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connections.Remove (cnc);
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}
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internal AuthenticationSchemes SelectAuthenticationScheme (HttpListenerContext context)
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{
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if (AuthenticationSchemeSelectorDelegate != null)
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return AuthenticationSchemeSelectorDelegate (context.Request);
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else
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return auth_schemes;
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}
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internal void UnregisterContext (HttpListenerContext context)
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{
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lock (((ICollection)registry).SyncRoot)
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registry.Remove (context);
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lock (((ICollection)ctx_queue).SyncRoot) {
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int idx = ctx_queue.IndexOf (context);
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if (idx >= 0)
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ctx_queue.RemoveAt (idx);
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}
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}
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#endregion
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#region Public Methods
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public void Abort ()
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{
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if (disposed)
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return;
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if (!listening) {
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return;
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}
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Close (true);
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}
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public IAsyncResult BeginGetContext (AsyncCallback callback, Object state)
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{
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CheckDisposed ();
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if (!listening)
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throw new InvalidOperationException ("Please, call Start before using this method.");
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ListenerAsyncResult ares = new ListenerAsyncResult (callback, state);
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// lock wait_queue early to avoid race conditions
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lock (((ICollection)wait_queue).SyncRoot) {
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lock (((ICollection)ctx_queue).SyncRoot) {
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HttpListenerContext ctx = GetContextFromQueue ();
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if (ctx != null) {
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ares.Complete (ctx, true);
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return ares;
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}
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}
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wait_queue.Add (ares);
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}
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return ares;
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}
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public void Close ()
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{
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if (disposed)
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return;
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if (!listening) {
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disposed = true;
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return;
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}
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Close (true);
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disposed = true;
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}
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public HttpListenerContext EndGetContext (IAsyncResult asyncResult)
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{
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CheckDisposed ();
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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ListenerAsyncResult ares = asyncResult as ListenerAsyncResult;
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if (ares == null)
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throw new ArgumentException ("Wrong IAsyncResult.", "asyncResult");
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if (ares.EndCalled)
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throw new ArgumentException ("Cannot reuse this IAsyncResult");
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ares.EndCalled = true;
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if (!ares.IsCompleted)
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ares.AsyncWaitHandle.WaitOne ();
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lock (((ICollection)wait_queue).SyncRoot) {
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int idx = wait_queue.IndexOf (ares);
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if (idx >= 0)
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wait_queue.RemoveAt (idx);
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}
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HttpListenerContext context = ares.GetContext ();
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context.ParseAuthentication (SelectAuthenticationScheme (context));
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return context; // This will throw on error.
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}
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public HttpListenerContext GetContext ()
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{
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// The prefixes are not checked when using the async interface!?
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if (prefixes.Count == 0)
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throw new InvalidOperationException ("Please, call AddPrefix before using this method.");
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ListenerAsyncResult ares = (ListenerAsyncResult) BeginGetContext (null, null);
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ares.InGet = true;
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return EndGetContext (ares);
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}
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public void Start ()
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{
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CheckDisposed ();
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if (listening)
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return;
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EndPointManager.AddListener (this);
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listening = true;
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}
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public void Stop ()
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{
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CheckDisposed ();
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listening = false;
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Close (false);
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}
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#endregion
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}
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}
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