Added components, authentication and authorization

Htmx.ApiDemo/Data/MongoDbService.cs

@@ -0,0 +1,47 @@
+using MongoDB.Bson;
+using MongoDB.Driver;
+
+namespace Htmx.ApiDemo.Data;
+
+/// <summary>
+/// Scoped service wrapping the AppUser MongoDB collection.
+/// All operations use MongoDB's native async API — no EF, no LINQ-to-SQL
+/// translation, no RelationalModel, fully NativeAOT safe.
+/// </summary>
+public sealed class MongoDbService
+{
+    private readonly IMongoCollection<AppUser> _users;
+
+    public MongoDbService(IMongoClient client, IConfiguration configuration)
+    {
+        var db = client.GetDatabase(configuration["MongoDbName"] ?? "HtmxAppDb");
+        _users = db.GetCollection<AppUser>("users");
+    }
+
+    /// <summary>Ensures the unique index on NormalizedEmail exists (idempotent).</summary>
+    public async Task EnsureIndexesAsync(CancellationToken ct = default)
+    {
+        var indexKeys = Builders<AppUser>.IndexKeys.Ascending(u => u.NormalizedEmail);
+        var indexOptions = new CreateIndexOptions { Unique = true, Name = "uq_normalizedEmail" };
+        var model = new CreateIndexModel<AppUser>(indexKeys, indexOptions);
+        await _users.Indexes.CreateOneAsync(model, cancellationToken: ct);
+    }
+
+    /// <summary>Returns true if a user with the given normalised email already exists.</summary>
+    public async Task<bool> EmailExistsAsync(string normalizedEmail, CancellationToken ct = default)
+    {
+        var filter = Builders<AppUser>.Filter.Eq(u => u.NormalizedEmail, normalizedEmail);
+        return await _users.Find(filter).AnyAsync(ct);
+    }
+
+    /// <summary>Returns the user matching the normalised email, or null.</summary>
+    public async Task<AppUser?> FindByNormalizedEmailAsync(string normalizedEmail, CancellationToken ct = default)
+    {
+        var filter = Builders<AppUser>.Filter.Eq(u => u.NormalizedEmail, normalizedEmail);
+        return await _users.Find(filter).FirstOrDefaultAsync(ct);
+    }
+
+    /// <summary>Inserts a new user document.</summary>
+    public Task InsertAsync(AppUser user, CancellationToken ct = default) =>
+        _users.InsertOneAsync(user, cancellationToken: ct);
+}