Add configuration type binding and implement database connection, disable NativeAOT.

Add: binding setting file items to `AppSettings` class so to provide DI access as `IOptions<OptixServeSettings>`.

Add: EF Core and DbContext to access database in services. This results in disabling NativeAOT due to poor supports for *pre-compiled query*, however many design are optimized for AOT for later re-adoption.

Add: `DesignTimeDbContextFactory` to support EF Core migrations in NativeAOT. (Kept for re-enabling AOT.)

Add: `DbInitializer` for ensuring database connecting in startup.

Add: `ConfigurationHelper.CreateDefaultBuilder()` to read configuration files in default locations. Note this method is currently ONLY used by `DesignTimeDbContextFactory`. Refactor is expected.

Add: `CommonErrorDto` for simple error message.

Add: `VersionEndpoint` ONLY for debugging and testing purpose. Verylikely to be removed in the future.

Other: many utilities and fixes easy to understand.

Note: EF Core migrations are excluded in the early development. Not expected to be added in version control before v1.0 beta.

OptixServe.Core/Data/AppDbContext.cs

@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore;
+using OptixServe.Core.Models;
+
+namespace OptixServe.Core.Data;
+
+public class AppDbContext(DbContextOptions options) : DbContext(options)
+{
+    public DbSet<User> Users { get; set; } = null!;
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<User>(user =>
+        {
+            user.HasKey(u => u.Id);
+        });
+
+        modelBuilder.Entity<User>().HasData([
+            new() {Id = "1", UserName = "admin", Password = "admin12345"}
+        ]);
+    }
+}

OptixServe.Core/Data/DbInitializer.cs

@@ -0,0 +1,11 @@
+namespace OptixServe.Core.Data;
+
+public class DbInitializer(AppDbContext dbContext)
+{
+    private readonly AppDbContext _context = dbContext;
+
+    public void Initialize()
+    {
+        _context.Database.EnsureCreated();
+    }
+}

OptixServe.Core/Models/User.cs

@@ -1,8 +1,15 @@
 namespace OptixServe.Core.Models;
 
+public enum PrivilegeGroup
+{
+    Admin,
+    User,
+}
+
 public record User
 {
     public required string Id { get; set; }
     public required string UserName { get; set; }
-    public required string Password { get; set; }
+    public string? Password { get; set; }
+    public PrivilegeGroup PrivilegeGroup { get; set; } = PrivilegeGroup.User;
 }

OptixServe.Core/OptixServe.Core.csproj

@@ -6,4 +6,8 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.6" />
+  </ItemGroup>
+
 </Project>

OptixServe.Core/Services/UserService.cs

@@ -1,3 +1,4 @@
+using OptixServe.Core.Data;
 using OptixServe.Core.Models;
 
 namespace OptixServe.Core.Services;
@@ -5,21 +6,20 @@ namespace OptixServe.Core.Services;
 public interface IUserService
 {
     IEnumerable<User> GetUsers();
-    User? GetUserById(string Id);
+    User? GetUserById(string id);
 }
 
-public class UserService : IUserService
+public class UserService(AppDbContext dbContext) : IUserService
 {
-    public User? GetUserById(string Id)
+    private readonly AppDbContext _dbContext = dbContext;
+
+    public User? GetUserById(string id)
     {
-        throw new NotImplementedException();
+        return _dbContext.Users.FirstOrDefault(u => u.Id == id);
     }
 
     public IEnumerable<User> GetUsers()
     {
-        return [
-            new() { Id = "1234", UserName = "xxx", Password = "pass1" },
-            new() { Id = "5678", UserName = "yyy", Password = "pass2" }
-        ];
+        return _dbContext.Users.AsEnumerable();
     }
 }