Add project files

StalwartSimpleLoginMiddleware/Program.cs

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+using System.Text.Json.Serialization;
+using AspNetCore.Authentication.ApiKey;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using Microsoft.OpenApi.Models;
+using Npgsql;
+using StalwartSimpleLoginMiddleware.Contexts;
+using StalwartSimpleLoginMiddleware.Models;
+using StalwartSimpleLoginMiddleware.Repositories;
+using StalwartSimpleLoginMiddleware.Services;
+
+var logger = LoggerFactory.Create(logging => logging.AddConsole()).CreateLogger("Startup");
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+
+builder.Services.AddDbContextPool<ApiKeyContext>((_, options) => ApiKeyContext.ConfigureOptions(options));
+
+builder.Services.AddHealthChecks()
+    .AddCheck("WebService", () => HealthCheckResult.Healthy("The web service is running."))
+    .AddDbContextCheck<ApiKeyContext>();
+
+builder.Services.AddScoped<IApiKeyAccessor, ApiKeyAccessor>()
+    .AddScoped<IApiKeyRepository, ApiKeyContextRepository>();
+
+builder.Services.AddAuthentication(ApiKeyDefaults.AuthenticationScheme)
+    .AddApiKeyInHeader(options =>
+    {
+        options.Realm = "StalwartSimpleLoginMiddleware";
+        options.KeyName = "Authentication";
+        options.Events = new ApiKeyProvider();
+    });
+
+builder.Services.AddAuthorization(options =>
+{
+    options.FallbackPolicy = new AuthorizationPolicyBuilder().RequireAuthenticatedUser().Build();
+});
+
+builder.Services.AddControllers()
+    .AddJsonOptions(options => { options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles; });
+// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen(c =>
+{
+    // Add the API Key Security Definition
+    c.AddSecurityDefinition("ApiKey", new OpenApiSecurityScheme
+    {
+        Description =
+            "API Key needed to access endpoints. Add it to the request headers as 'Authentication: <API_KEY>'",
+        Type = SecuritySchemeType.ApiKey,
+        Name = "Authentication", // Header name for the API Key
+        In = ParameterLocation.Header
+    });
+
+    // Add security requirements to ensure the header is required
+    c.AddSecurityRequirement(new OpenApiSecurityRequirement
+    {
+        {
+            new OpenApiSecurityScheme
+            {
+                Reference = new OpenApiReference
+                {
+                    Type = ReferenceType.SecurityScheme,
+                    Id = "ApiKey"
+                }
+            },
+            new string[] { } // No specific scopes
+        }
+    });
+});
+
+builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>()
+    .AddSingleton<StalwartClient>();
+
+var app = builder.Build();
+
+// Ensure the database is migrated at startup.
+using (var scope = app.Services.CreateScope())
+{
+    try
+    {
+        var services = scope.ServiceProvider;
+        var context = services.GetRequiredService<ApiKeyContext>();
+        await context.EnsureDatabaseMigrated(logger);
+    }
+    catch (NpgsqlException ex)
+    {
+        if (ex.SqlState is PostgresErrorCodes.ConnectionFailure or PostgresErrorCodes.ConnectionException ||
+            ex.Message.StartsWith("Failed to connect"))
+            logger.LogCritical($"Database connection failed: {ex.Message}");
+        else if (ex.SqlState is PostgresErrorCodes.InvalidPassword
+                 or PostgresErrorCodes.InvalidAuthorizationSpecification)
+            logger.LogCritical("Failed to connect. Invalid password.");
+        else
+            logger.LogCritical($"An unknown error occurred:{Environment.NewLine}{ex.StackTrace}");
+    }
+}
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.UseHttpsRedirection();
+
+app.UseRouting();
+
+app.UseAuthentication();
+app.UseAuthorization();
+
+app.MapControllers();
+
+app.MapHealthChecks("/health");
+app.Run();