Secure server sockets for dart:io. Add TlsServerSocket class, providing SSL server sockets.

sdk/lib/io/tls_server_socket.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+
+abstract class TlsServerSocket implements ServerSocket {
+  /**
+   * Constructs a new secure server socket, binds it to a given address
+   * and port, and listens on it.  Incoming client connections are
+   * promoted to secure connections, using the server certificate set by
+   * SetCertificate.  The bindAddress must be given as a numeric address,
+   * not a host name.
+   */
+  factory TlsServerSocket(String bindAddress, int port, int backlog) =>
+      new _TlsServerSocket(bindAddress, port, backlog);
+
+  /**
+   * Chooses the certificate for the server socket to use when authenticating
+   * itself to a client.  The name is the distinguished name (DN) of the
+   * certificate, such as "CN=localhost" or "CN=myserver.mydomain.com".
+   * The certificate is looked up in the NSS certificate database set by
+   * TlsSocket.setCertificateDatabase.
+   */
+  void setCertificate(String certificate_name);

[Mads Ager (google), 2012/11/20 14:59:45]

Since this is per instance, can we make it an argument to the constructor
instead? I would prefer to avoid the extra call to create a functioning tls
server socket.

[Bill Hesse, 2012/11/20 17:46:55]

Done.

+}
+
+
+class _TlsServerSocket implements TlsServerSocket {
+
+  _TlsServerSocket(String bindAddress, int port, int backlog) {
+    _socket = new ServerSocket(bindAddress, port, backlog);
+    _socket.onConnection = this._onConnectionHandler;
+  }
+
+  void setCertificate(String certificate_name) {
+    _certificate_name = certificate_name;
+  }
+
+  void set onConnection(void callback(Socket connection)) {
+    _onConnectionCallback = callback;
+  }
+
+  void set onError(void callback(e)) {
+    _socket.onError = callback;
+  }
+
+  /**
+   * Returns the port used by this socket.
+   */
+  int get port => _socket.port;
+
+  /**
+   * Closes the socket.
+   */
+  void close() {
+    _socket.close();
+  }
+
+  void _onConnectionHandler(Socket connection) {
+    if (_onConnectionCallback == null) {
+      connection.close();
+      throw new SocketIOException(
+          "TlsServerSocket with no onConnection callback connected to");
+    }
+    if (_certificate_name == null) {
+      connection.close();
+      throw new SocketIOException(
+          "TlsServerSocket with server certificate not set connected to");
+    }
+    var secure_connection = new _TlsSocket.server(connection.remoteHost,
+                                                  connection.remotePort,
+                                                  connection,
+                                                  _certificate_name);
+    _onConnectionCallback(secure_connection);
+  }
+
+  ServerSocket _socket;
+  var _onConnectionCallback;
+  String _certificate_name;
+}