WorkFlow/src/WorkFlow.API/Program.cs

using WorkFlow.Application;
using DigitalData.UserManager.Application;
using Microsoft.EntityFrameworkCore;
using WorkFlow.Infrastructure;
using DigitalData.Core.API;
using DigitalData.Core.Application;
using DigitalData.UserManager.Application.DTOs.User;
using Microsoft.IdentityModel.Tokens;
using WorkFlow.API.Models;
using NLog;
using NLog.Web;
using WorkFlow.API.Extensions;
using WorkFlow.API.Filters;
using Microsoft.OpenApi.Models;
using DigitalData.Auth.Client;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using WorkFlow.API;
using Microsoft.Extensions.Options;
using DigitalData.Core.Abstractions.Security;
using DigitalData.Core.Abstractions.Security.Extensions;

var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
logger.Info("Logging initialized.");

try
{
    var builder = WebApplication.CreateBuilder(args);
    var config = builder.Configuration;

    Directory
        .GetFiles(builder.Environment.ContentRootPath, "appsettings.*.json", SearchOption.TopDirectoryOnly)
        .Where(file => Path.GetFileName(file) != $"appsettings.Development.json")
        .ToList()
        .ForEach(file => config.AddJsonFile(file, true, true));

    // Add NLogger
    builder.Logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
    if (!builder.Environment.IsDevelopment())
    {
        builder.Logging.ClearProviders();
        builder.Host.UseNLog();
    }

    // Add services to the container
    var cnn_str = config.GetConnectionString("Default") ?? throw new("Default connection string not found.");
    builder.Services.AddDbContext<WFDBContext>(options => options.UseSqlServer(cnn_str).EnableDetailedErrors());
    var mediatRLicense = config["MediatRLicense"]
        ?? throw new InvalidOperationException(
            "The 'MediatRLicense' configuration value is missing or empty." +
            "Please ensure it is properly set in the configuration source.");
    builder.Services.AddWorkFlowServices(opt => opt.MediatRLicense = mediatRLicense).AddWorkFlowRepositories().AddUserManager<WFDBContext>();
    builder.Services.AddCookieBasedLocalizer();
    builder.Services.AddDirectorySearchService(config.GetSection("DirectorySearchOptions"));
    builder.Services.AddJWTService<UserReadDto>(user => new SecurityTokenDescriptor()
    {
        Claims = user.ToClaimList().ToDictionary(claim => claim.Type, claim => claim.Value as object)
    });

    bool disableAPIKeyAuth = config.GetValue<bool>("DisableAPIKeyAuth") && builder.IsDevOrDiP();
    if (disableAPIKeyAuth)
        builder.Services.AddAPIKeyAuth(new APIKeyAuthOptions());
    else
        if (config.GetSection("APIKeyAuth").Get<APIKeyAuthOptions>() is APIKeyAuthOptions options)
        builder.Services.AddAPIKeyAuth(options);
    else
        throw new("The API Key Authorization configuration is not available in the app settings, even though the app is not in development or DiP mode and API Key Authorization is not disabled.");

    var lazyProvider = new LazyServiceProvider();

    builder.Services.AddAuthHubClient(config.GetSection("AuthClientParams"));

    builder.Services.AddControllers();

    var authTokenKeys = config.GetSection(nameof(AuthTokenKeys)).Get<AuthTokenKeys>() ?? new();

    builder.Services.AddAuthentication(options =>
    {
        options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
        options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
    })
            .AddJwtBearer(opt =>
        {
            opt.TokenValidationParameters = new TokenValidationParameters
            {
                ValidateIssuerSigningKey = true,
                IssuerSigningKeyResolver = (token, securityToken, identifier, parameters) =>
                {
                    var clientParams = lazyProvider.GetRequiredService<IOptions<ClientParams>>()?.Value;
                    var publicKey = clientParams!.PublicKeys.Get(authTokenKeys.Issuer, authTokenKeys.Audience);
                    return new List<SecurityKey>() { publicKey.SecurityKey };
                },
                ValidateIssuer = true,
                ValidIssuer = authTokenKeys.Issuer,
                ValidateAudience = true,
                ValidAudience = authTokenKeys.Audience,
            };

            opt.Events = new JwtBearerEvents
            {
                OnMessageReceived = context =>
                {
                    // if there is no token read related cookie or query string
                    if (context.Token is null)   // if there is no token
                    {
                        if (context.Request.Cookies.TryGetValue(authTokenKeys.Cookie, out var cookieToken) && cookieToken is not null)
                            context.Token = cookieToken;
                        else if (context.Request.Query.TryGetValue(authTokenKeys.QueryString, out var queryStrToken))
                            context.Token = queryStrToken;
                    }
                    return Task.CompletedTask;
                }
            };
        });

    builder.Services.AddEndpointsApiExplorer();
    builder.Services.AddSwaggerGen(setupAct =>
    {
        setupAct.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
        {
            Description = "JWT Authorization header using the Bearer scheme. Example: \"Bearer {token}\"",
            Name = "Authorization",
            In = ParameterLocation.Header,
            Type = SecuritySchemeType.Http,
            Scheme = "Bearer"
        });

        setupAct.AddSecurityRequirement(new OpenApiSecurityRequirement
        {
            {
                new OpenApiSecurityScheme
                {
                    Reference = new OpenApiReference
                    {
                        Type = ReferenceType.SecurityScheme,
                        Id = "Bearer"
                    }
                },
                Array.Empty<string>()
            }
        });

        if (!disableAPIKeyAuth)
            setupAct.OperationFilter<APIKeyAuthHeaderOpFilter>();

        if (config.GetSection("OpenApiInfo").Get<OpenApiInfo>() is OpenApiInfo openApiInfo)
            setupAct.SwaggerDoc(openApiInfo?.Version ?? "v1", openApiInfo);
    });

    var app = builder.Build();

    lazyProvider.Factory = () => app.Services;

    // Configure the HTTP request pipeline.
    if (app.IsDevOrDiP() && app.Configuration.GetValue<bool>("EnableSwagger"))
    {
        app.UseSwagger();
        app.UseSwaggerUI();
    }

    app.UseHttpsRedirection();

    app.UseAuthentication();

    app.UseAuthorization();

    app.UseCookieBasedLocalizer("de-DE");

    app.MapControllers();

    app.Run();
}
catch (Exception ex)
{
    logger.Error(ex, "Stopped program because of exception.");
    throw;
}