Restore SEBPatch
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292
SafeExamBrowser.Runtime/Operations/ServerOperation.cs
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292
SafeExamBrowser.Runtime/Operations/ServerOperation.cs
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/*
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* Copyright (c) 2024 ETH Zürich, IT Services
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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 System.Collections.Generic;
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using System.Linq;
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using SafeExamBrowser.Configuration.Contracts;
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using SafeExamBrowser.Core.Contracts.OperationModel;
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using SafeExamBrowser.Core.Contracts.OperationModel.Events;
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using SafeExamBrowser.I18n.Contracts;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Runtime.Operations.Events;
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using SafeExamBrowser.Server.Contracts;
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using SafeExamBrowser.Server.Contracts.Data;
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using SafeExamBrowser.Settings;
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using SafeExamBrowser.SystemComponents.Contracts;
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using SafeExamBrowser.UserInterface.Contracts.MessageBox;
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namespace SafeExamBrowser.Runtime.Operations
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{
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internal class ServerOperation : ConfigurationBaseOperation
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{
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private readonly IFileSystem fileSystem;
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private readonly ILogger logger;
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private readonly IServerProxy server;
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public override event ActionRequiredEventHandler ActionRequired;
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public override event StatusChangedEventHandler StatusChanged;
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public ServerOperation(
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string[] commandLineArgs,
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IConfigurationRepository configuration,
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IFileSystem fileSystem,
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ILogger logger,
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SessionContext context,
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IServerProxy server) : base(commandLineArgs, configuration, context)
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{
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this.fileSystem = fileSystem;
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this.logger = logger;
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this.server = server;
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}
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public override OperationResult Perform()
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{
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var result = OperationResult.Success;
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if (Context.Next.Settings.SessionMode == SessionMode.Server)
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{
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var browserExamKey = default(string);
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var exam = default(Exam);
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var exams = default(IEnumerable<Exam>);
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var uri = default(Uri);
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logger.Info("Initializing server...");
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StatusChanged?.Invoke(TextKey.OperationStatus_InitializeServer);
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server.Initialize(Context.Next.Settings.Server);
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var (abort, fallback, success) = TryPerformWithFallback(() => server.Connect());
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if (success)
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{
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(abort, fallback, success) = TryPerformWithFallback(() => server.GetAvailableExams(Context.Next.Settings.Server.ExamId), out exams);
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}
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if (success)
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{
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success = TrySelectExam(exams, out exam);
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}
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if (success)
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{
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(abort, fallback, success) = TryPerformWithFallback(() => server.GetConfigurationFor(exam), out uri);
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}
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if (success)
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{
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result = TryLoadServerSettings(exam, uri);
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}
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if (success && result == OperationResult.Success)
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{
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(abort, fallback, success) = TryPerformWithFallback(() => server.SendSelectedExam(exam), out browserExamKey);
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}
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if (browserExamKey != default)
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{
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Context.Next.Settings.Browser.CustomBrowserExamKey = browserExamKey;
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}
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if (abort)
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{
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result = OperationResult.Aborted;
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logger.Info("The user aborted the server operation.");
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}
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if (fallback)
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{
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Context.Next.Settings.SessionMode = SessionMode.Normal;
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result = OperationResult.Success;
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logger.Info("The user chose to fallback and start a normal session.");
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}
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}
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return result;
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}
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public override OperationResult Repeat()
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{
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var result = OperationResult.Success;
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if (Context.Current.Settings.SessionMode == SessionMode.Server && Context.Next.Settings.SessionMode == SessionMode.Server)
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{
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result = AbortServerReconfiguration();
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}
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else if (Context.Current.Settings.SessionMode == SessionMode.Server)
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{
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result = Revert();
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}
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else if (Context.Next.Settings.SessionMode == SessionMode.Server)
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{
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result = Perform();
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}
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return result;
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}
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public override OperationResult Revert()
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{
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var result = OperationResult.Success;
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if (Context.Current?.Settings.SessionMode == SessionMode.Server || Context.Next?.Settings.SessionMode == SessionMode.Server)
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{
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logger.Info("Finalizing server...");
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StatusChanged?.Invoke(TextKey.OperationStatus_FinalizeServer);
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var disconnect = server.Disconnect();
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if (disconnect.Success)
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{
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result = OperationResult.Success;
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}
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else
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{
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result = OperationResult.Failed;
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}
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}
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return result;
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}
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protected override void InvokeActionRequired(ActionRequiredEventArgs args)
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{
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ActionRequired?.Invoke(args);
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}
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private OperationResult TryLoadServerSettings(Exam exam, Uri uri)
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{
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var info = server.GetConnectionInfo();
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var result = OperationResult.Failed;
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var status = TryLoadSettings(uri, UriSource.Server, out _, out var settings);
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fileSystem.Delete(uri.LocalPath);
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if (status == LoadStatus.Success)
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{
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var browserSettings = Context.Next.Settings.Browser;
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var serverSettings = Context.Next.Settings.Server;
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Context.Next.AppConfig.ServerApi = info.Api;
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Context.Next.AppConfig.ServerConnectionToken = info.ConnectionToken;
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Context.Next.AppConfig.ServerExamId = exam.Id;
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Context.Next.AppConfig.ServerOauth2Token = info.Oauth2Token;
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Context.Next.Settings = settings;
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Context.Next.Settings.Browser.StartUrl = exam.Url;
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Context.Next.Settings.Browser.StartUrlQuery = browserSettings.StartUrlQuery;
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Context.Next.Settings.Server = serverSettings;
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Context.Next.Settings.SessionMode = SessionMode.Server;
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result = OperationResult.Success;
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}
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return result;
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}
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private (bool abort, bool fallback, bool success) TryPerformWithFallback(Func<ServerResponse> request)
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{
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var abort = false;
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var fallback = false;
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var success = false;
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while (!success)
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{
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var response = request();
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success = response.Success;
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if (!success && !Retry(response.Message, out abort, out fallback))
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{
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break;
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}
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}
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return (abort, fallback, success);
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}
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private (bool abort, bool fallback, bool success) TryPerformWithFallback<T>(Func<ServerResponse<T>> request, out T value)
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{
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var abort = false;
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var fallback = false;
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var success = false;
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value = default;
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while (!success)
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{
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var response = request();
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success = response.Success;
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value = response.Value;
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if (!success && !Retry(response.Message, out abort, out fallback))
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{
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break;
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}
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}
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return (abort, fallback, success);
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}
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private bool Retry(string message, out bool abort, out bool fallback)
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{
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var args = new ServerFailureEventArgs(message, Context.Next.Settings.Server.PerformFallback);
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ActionRequired?.Invoke(args);
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abort = args.Abort;
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fallback = args.Fallback;
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if (args.Retry)
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{
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logger.Debug("The user chose to retry the current server request.");
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}
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return args.Retry;
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}
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private bool TrySelectExam(IEnumerable<Exam> exams, out Exam exam)
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{
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var success = true;
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if (string.IsNullOrWhiteSpace(Context.Next.Settings.Server.ExamId))
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{
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var args = new ExamSelectionEventArgs(exams);
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ActionRequired?.Invoke(args);
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exam = args.SelectedExam;
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success = args.Success;
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}
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else
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{
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exam = exams.First();
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logger.Info("Automatically selected exam as defined in configuration.");
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}
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return success;
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}
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private OperationResult AbortServerReconfiguration()
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{
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var args = new MessageEventArgs
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{
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Action = MessageBoxAction.Ok,
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Icon = MessageBoxIcon.Warning,
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Message = TextKey.MessageBox_ServerReconfigurationWarning,
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Title = TextKey.MessageBox_ServerReconfigurationWarningTitle
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};
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logger.Warn("Server reconfiguration is currently not supported, aborting...");
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ActionRequired?.Invoke(args);
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return OperationResult.Aborted;
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}
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}
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}
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