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21 files changed

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‎csharp/dotnetcore_quiz/.vscode/launch.json‎

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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": ".NET Core Launch (web)",
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"type": "coreclr",
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"request": "launch",
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"preLaunchTask": "build",
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"program": "${workspaceFolder}/bin/Debug/net8.0/dotnetcore_quiz.dll",
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"args": [],
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"cwd": "${workspaceFolder}",
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"stopAtEntry": false,
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"serverReadyAction": {
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"action": "openExternally",
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"pattern": "\\bNow listening on:\\s+(https?://\\S+)"
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},
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"env": {
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"ASPNETCORE_ENVIRONMENT": "Production"
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},
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"sourceFileMap": {
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"/Views": "${workspaceFolder}/Views"
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}
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},
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{
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"name": ".NET Core Launch (web) Debug",
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"type": "coreclr",
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"request": "launch",
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"preLaunchTask": "build",
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"program": "${workspaceFolder}/bin/Debug/net8.0/dotnetcore_quiz.dll",
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"args": [],
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"cwd": "${workspaceFolder}",
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"stopAtEntry": false,
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"serverReadyAction": {
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"action": "openExternally",
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"pattern": "\\bNow listening on:\\s+(https?://\\S+)"
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},
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"env": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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},
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"sourceFileMap": {
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"/Views": "${workspaceFolder}/Views"
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}
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}
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]
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}
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‎csharp/dotnetcore_quiz/.vscode/tasks.json‎

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{
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"version": "2.0.0",
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"tasks": [
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{
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"label": "build",
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"command": "dotnet",
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"type": "process",
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"args": [
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"build",
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"${workspaceFolder}/dotnetcore_quiz.csproj"
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],
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"problemMatcher": "$msCompile"
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}
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]
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}
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‎csharp/dotnetcore_quiz/Config/LoggerConfig.cs‎

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using Serilog;
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using Serilog.Events;
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namespace SecureFromScratch.Quiz.Config
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{
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public static class LoggerConfig
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{
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public static void Configure()
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{
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Log.Logger = new LoggerConfiguration()
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.MinimumLevel.Information()
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.Enrich.FromLogContext()
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.WriteTo.Console()
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.WriteTo.File("Logs/log.txt", rollingInterval: RollingInterval.Day)
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.CreateLogger();
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}
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}
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}

‎csharp/dotnetcore_quiz/Config/LoggerEx.cs‎

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public class LoggerEx
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{
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private readonly ILogger _logger;
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private static readonly string VALID_CHARS = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'()-";
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public LoggerEx(ILogger logger)
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{
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_logger = logger;
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}
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public void LogInformation(string message, params object[] args)
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{
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checkMessage(args);
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_logger.LogInformation(message, args);
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}
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public void LogWarning(string message, params object[] args)
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{
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checkMessage(args);
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_logger.LogWarning(message, args);
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}
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public void checkMessage(params object[] args)
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{
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foreach (string item in args)
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{
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if (!hasOnlyValidChars(item, VALID_CHARS))
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{
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Console.Error.WriteLine("Log contains invlaid characters");
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throw new ArgumentException("Log is not valid.");
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}
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}
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}
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private static bool hasOnlyValidChars(string input, string validChars)
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{
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foreach (char c in input)
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{
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if (!validChars.Contains(c))
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{
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return false;
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}
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}
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return true;
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}
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}

‎csharp/dotnetcore_quiz/Controllers/QuizController.cs‎

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using Microsoft.AspNetCore.Mvc;
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using Microsoft.Extensions.Logging;
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using SecureFromScratch.Quiz.Model;
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using SecureFromScratch.Quiz.Services;
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using SecureFromScratch.Quiz.Safety;
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//using SecureFromScratch.Quiz.Safety.Spoilers;
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using SecureFromScratch.Quiz.Config;
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namespace SecureFromScratch.Quiz.Controllers
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{
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[ApiController]
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[Route("/")]
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public class QuizController : ControllerBase
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{
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private readonly ILogger<QuizController> _logger;
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//private readonly LoggerEx _answersLogger;
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private readonly ILogger _answersLogger;
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private readonly MultipleChoiceQuestion _quizService;
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public QuizController(
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ILogger<QuizController> logger,
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ILoggerFactory loggerFactory,
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MultipleChoiceQuestion quizService)
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{
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_logger = logger;
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//_answersLogger = new LoggerEx(loggerFactory.CreateLogger("Answers"));
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_answersLogger = logger;
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_quizService = quizService;
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}
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private static string GenerateAnswerOption(string username, string optionText, bool isCorrect)
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{
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return $"<a href='/answer?username={username}&isCorrect={isCorrect}'>{optionText}</a><br>\n";
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}
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public record QuestionDetails(string Question, string[] Answers);
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[HttpGet("question")]
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public ContentResult GetQuestionDetails([FromQuery(Name = "username")] string rawUsername)
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{
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_logger.LogInformation("/question with name={Username}", rawUsername);
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var question = _quizService.GetQuestion();
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_logger.LogInformation("/question returning question: {Question}", question);
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var username = new FullName(rawUsername);
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var shuffledAnswers = _quizService.GenerateShuffledAnswers();
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var options = shuffledAnswers.Options;
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var correctAnswerIdx = shuffledAnswers.CorrectAnswerIdx;
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var html = "<html>" +
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"<head><title>Answer The Daily Question</title></head>" +
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"<body>" +
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$"<h2>{question}</h2><br>\n" +
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"Here are the possible answers, choose the appropriate link:<br>\n" +
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GenerateAnswerOption(username.Username, options[0], correctAnswerIdx == 0) +
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GenerateAnswerOption(username.Username, options[1], correctAnswerIdx == 1) +
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GenerateAnswerOption(username.Username, options[2], correctAnswerIdx == 2) +
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GenerateAnswerOption(username.Username, options[3], correctAnswerIdx == 3) +
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"</body></html>";
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return Content(html, "text/html");
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}
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private string GenerateAnswerOption(object value, string v1, bool v2)
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{
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throw new NotImplementedException();
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}
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[HttpGet("answer")]
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public ContentResult SubmitAnswer([FromQuery(Name = "username")] string rawUsername, [FromQuery] bool isCorrect)
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{
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_logger.LogInformation("/answer with name={Username} and answer={Answer}", rawUsername, isCorrect);
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var username = new FullName(rawUsername);
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if (isCorrect)
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_answersLogger.LogWarning("Right: {Username}", username.Username);
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else
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_answersLogger.LogInformation("Wrong: {Username}", username.Username);
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var html = "<html>" +
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"<head><title>Done!</title></head>" +
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"<body>" +
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$"<h2>Thank you for submitting, {username.Username}</h2>" +
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"<a href='/index.html'>Start Again</a>" +
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"</body></html>";
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return Content(html, "text/html");
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}
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}
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}

‎csharp/dotnetcore_quiz/Model/ShuffledAnswers.cs‎

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namespace SecureFromScratch.Quiz.Model
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{
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public class ShuffledAnswers
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{
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public string[] Options { get; set; }
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public int CorrectAnswerIdx { get; set; }
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}
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}

‎csharp/dotnetcore_quiz/Program.cs‎

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using Serilog;
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using SecureFromScratch.Quiz.Config;
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LoggerConfig.Configure(); // ✅ Call your custom method
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var builder = WebApplication.CreateBuilder(args);
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builder.Host.UseSerilog(); // ✅ Plug Serilog into ASP.NET
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builder.Services.AddControllers();
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builder.Services.AddSingleton<SecureFromScratch.Quiz.Services.MultipleChoiceQuestion>();
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var app = builder.Build();
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if (app.Environment.IsDevelopment())
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{
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app.UseDeveloperExceptionPage(); // shows detailed errors
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}
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else
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{
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app.UseExceptionHandler("/error"); // generic error endpoint
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app.UseHsts();
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}
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app.Map("/error", () => Results.Problem("An unexpected error occurred."));
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app.UseDefaultFiles();
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app.UseStaticFiles();
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app.MapControllers();
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app.Run();

‎csharp/dotnetcore_quiz/Properties/launchSettings.json‎

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{
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"$schema": "http://json.schemastore.org/launchsettings.json",
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"iisSettings": {
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"windowsAuthentication": false,
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"anonymousAuthentication": true,
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"iisExpress": {
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"applicationUrl": "http://localhost:38362",
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"sslPort": 44303
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}
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},
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"profiles": {
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"http": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"launchUrl": "swagger",
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"applicationUrl": "http://localhost:5223",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"https": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"launchUrl": "swagger",
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"applicationUrl": "https://localhost:7180;http://localhost:5223",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"IIS Express": {
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"commandName": "IISExpress",
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"launchBrowser": true,
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"launchUrl": "swagger",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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}
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}
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}

‎csharp/dotnetcore_quiz/Safety/FullName.cs‎

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namespace SecureFromScratch.Quiz.Safety
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{
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public class FullName
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{
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public string Username { get; }
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public FullName(string username)
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{
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if (string.IsNullOrWhiteSpace(username))
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throw new ArgumentException("Username cannot be empty.");
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Username = username;
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}
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public override string ToString() => Username;
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}
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}

‎csharp/dotnetcore_quiz/Services/MultipleChoiceQuestion.cs‎

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using SecureFromScratch.Quiz.Model;
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namespace SecureFromScratch.Quiz.Services
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{
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public class MultipleChoiceQuestion
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{
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public string GetQuestion() => "What is the capital of France?";
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public ShuffledAnswers GenerateShuffledAnswers() => new ShuffledAnswers
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{
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Options = new[] { "Paris", "Berlin", "Rome", "Madrid" },
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CorrectAnswerIdx = 0
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};
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}
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}

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