111 lines
4.1 KiB
C#
111 lines
4.1 KiB
C#
/*
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* Copyright (c) 2021 ETH Zürich, Educational Development and Technology (LET)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using SafeExamBrowser.Communication.Contracts;
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using SafeExamBrowser.Communication.Contracts.Data;
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using SafeExamBrowser.Communication.Contracts.Events;
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using SafeExamBrowser.Communication.Contracts.Hosts;
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using SafeExamBrowser.Communication.Hosts;
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using SafeExamBrowser.Logging.Contracts;
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namespace SafeExamBrowser.Client.Communication
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{
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internal class ClientHost : BaseHost, IClientHost
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{
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private bool allowConnection;
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private int processId;
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public Guid AuthenticationToken { private get; set; }
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public bool IsConnected { get; private set; }
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public event CommunicationEventHandler<ExamSelectionRequestEventArgs> ExamSelectionRequested;
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public event CommunicationEventHandler<MessageBoxRequestEventArgs> MessageBoxRequested;
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public event CommunicationEventHandler<PasswordRequestEventArgs> PasswordRequested;
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public event CommunicationEventHandler ReconfigurationAborted;
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public event CommunicationEventHandler<ReconfigurationEventArgs> ReconfigurationDenied;
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public event CommunicationEventHandler RuntimeDisconnected;
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public event CommunicationEventHandler<ServerFailureActionRequestEventArgs> ServerFailureActionRequested;
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public event CommunicationEventHandler Shutdown;
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public ClientHost(
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string address,
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IHostObjectFactory factory,
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ILogger logger,
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int processId,
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int timeout_ms) : base(address, factory, logger, timeout_ms)
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{
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this.allowConnection = true;
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this.processId = processId;
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}
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protected override bool OnConnect(Guid? token)
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{
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var authenticated = AuthenticationToken == token;
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var accepted = allowConnection && authenticated;
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if (accepted)
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{
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allowConnection = false;
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IsConnected = true;
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}
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return accepted;
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}
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protected override void OnDisconnect(Interlocutor interlocutor)
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{
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if (interlocutor == Interlocutor.Runtime)
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{
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RuntimeDisconnected?.Invoke();
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IsConnected = false;
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}
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}
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protected override Response OnReceive(Message message)
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{
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switch (message)
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{
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case ExamSelectionRequestMessage m:
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ExamSelectionRequested?.InvokeAsync(new ExamSelectionRequestEventArgs { Exams = m.Exams, RequestId = m.RequestId });
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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case MessageBoxRequestMessage m:
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MessageBoxRequested?.InvokeAsync(new MessageBoxRequestEventArgs { Action = m.Action, Icon = m.Icon, Message = m.Message, RequestId = m.RequestId, Title = m.Title });
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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case PasswordRequestMessage m:
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PasswordRequested?.InvokeAsync(new PasswordRequestEventArgs { Purpose = m.Purpose, RequestId = m.RequestId });
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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case ReconfigurationDeniedMessage m:
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ReconfigurationDenied?.InvokeAsync(new ReconfigurationEventArgs { ConfigurationPath = m.FilePath });
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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case ServerFailureActionRequestMessage m:
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ServerFailureActionRequested?.InvokeAsync(new ServerFailureActionRequestEventArgs { Message = m.Message, RequestId = m.RequestId, ShowFallback = m.ShowFallback });
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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}
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return new SimpleResponse(SimpleResponsePurport.UnknownMessage);
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}
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protected override Response OnReceive(SimpleMessagePurport message)
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{
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switch (message)
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{
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case SimpleMessagePurport.Authenticate:
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return new AuthenticationResponse { ProcessId = processId };
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case SimpleMessagePurport.ReconfigurationAborted:
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ReconfigurationAborted?.InvokeAsync();
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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case SimpleMessagePurport.Shutdown:
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Shutdown?.Invoke();
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return new SimpleResponse(SimpleResponsePurport.Acknowledged);
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}
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return new SimpleResponse(SimpleResponsePurport.UnknownMessage);
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}
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}
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}
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