v0.1.31

Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>0.1.23</Version>
+    <Version>0.1.31</Version>
   </PropertyGroup>
 </Project>
 

Femto.Api/Auth/CookieSettings.cs

@@ -2,6 +2,7 @@ namespace Femto.Api.Auth;
 
 public class CookieSettings
 {
+    public SameSiteMode SameSite { get; set; }
     public bool Secure { get; set; }
     public string? Domain { get; set; }
 }

Femto.Api/Auth/SessionAuthenticationHandler.cs

@@ -3,11 +3,11 @@ using System.Text.Encodings.Web;
 using Femto.Api.Sessions;
 using Femto.Common;
 using Femto.Modules.Auth.Application;
-using Femto.Modules.Auth.Application.Interface.ValidateSession;
-using Femto.Modules.Auth.Errors;
+using Femto.Modules.Auth.Application.Dto;
+using Femto.Modules.Auth.Contracts;
+using Femto.Modules.Auth.Models;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.Extensions.Options;
-using Microsoft.OpenApi.Extensions;
 
 namespace Femto.Api.Auth;
 
@@ -15,48 +15,115 @@ internal class SessionAuthenticationHandler(
     IOptionsMonitor<AuthenticationSchemeOptions> options,
     ILoggerFactory logger,
     UrlEncoder encoder,
-    IAuthModule authModule,
+    IAuthService authService,
     CurrentUserContext currentUserContext
 ) : AuthenticationHandler<AuthenticationSchemeOptions>(options, logger, encoder)
 {
     protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
     {
-        var sessionId = this.Request.Cookies["session"];
-        if (string.IsNullOrWhiteSpace(sessionId))
+        Logger.LogDebug("{TraceId} Authenticating session", this.Context.TraceIdentifier);
+
+        var user = await this.TryAuthenticateWithSession();
+
+        if (user is null)
+            user = await this.TryAuthenticateWithRememberMeToken();
+
+        if (user is null)
             return AuthenticateResult.NoResult();
 
-        try
+        var claims = new List<Claim>
         {
-            var result = await authModule.Command(new ValidateSessionCommand(sessionId));
+            new(ClaimTypes.Name, user.Username),
+            new("sub", user.Id.ToString()),
+            new("user_id", user.Id.ToString()),
+        };
 
-            var claims = new List<Claim>
-            {
-                new(ClaimTypes.Name, result.User.Username),
-                new("sub", result.User.Id.ToString()),
-                new("user_id", result.User.Id.ToString()),
-            };
+        claims.AddRange(user.Roles.Select(role => new Claim(ClaimTypes.Role, role.ToString())));
 
-            claims.AddRange(
-                result.User.Roles.Select(role => new Claim(ClaimTypes.Role, role.ToString()))
-            );
+        var identity = new ClaimsIdentity(claims, this.Scheme.Name);
+        var principal = new ClaimsPrincipal(identity);
+        currentUserContext.CurrentUser = new CurrentUser(
+            user.Id,
+            user.Username,
+            user.Roles.Contains(Role.SuperUser)
+        );
 
-            var identity = new ClaimsIdentity(claims, this.Scheme.Name);
-            var principal = new ClaimsPrincipal(identity);
+        return AuthenticateResult.Success(new AuthenticationTicket(principal, this.Scheme.Name));
+    }
 
-            this.Context.SetSession(result.Session, result.User, Logger);
-            currentUserContext.CurrentUser = new CurrentUser(
-                result.User.Id,
-                result.User.Username,
-                result.Session.SessionId
-            );
+    private async Task<UserInfo?> TryAuthenticateWithSession()
+    {
+        var sessionId = this.Context.GetSessionId();
 
-            return AuthenticateResult.Success(
-                new AuthenticationTicket(principal, this.Scheme.Name)
-            );
-        }
-        catch (InvalidSessionError)
+        if (sessionId is null)
         {
-            return AuthenticateResult.Fail("Invalid session");
+            Logger.LogDebug("{TraceId} SessionId was null ", this.Context.TraceIdentifier);
+            return null;
         }
+
+        var session = await authService.GetSession(sessionId);
+
+        if (session is null)
+        {
+            Logger.LogDebug("{TraceId} Loaded session was null ", this.Context.TraceIdentifier);
+            return null;
+        }
+
+        if (session.IsExpired)
+        {
+            Logger.LogDebug("{TraceId} Loaded session was expired ", this.Context.TraceIdentifier);
+            await authService.DeleteSession(sessionId);
+            this.Context.DeleteSession();
+            return null;
+        }
+
+        var user = await authService.GetUserWithId(session.UserId);
+
+        if (user is null)
+        {
+            await authService.DeleteSession(sessionId);
+            this.Context.DeleteSession();
+            return null;
+        }
+
+        if (session.ExpiresSoon)
+        {
+            session = await authService.CreateWeakSession(session.UserId);
+            this.Context.SetSession(session, user);
+        }
+
+        return user;
+    }
+
+    private async Task<UserInfo?> TryAuthenticateWithRememberMeToken()
+    {
+        /*
+         * load remember me from token
+         * if it is null, return null
+         * if it exists, validate it
+         * if it is valid, create a new weak session, return the user
+         * if it is almost expired, refresh it
+         */
+
+        var rememberMeToken = this.Context.GetRememberMeToken();
+
+        if (rememberMeToken is null)
+            return null;
+
+        var (user, newRememberMeToken) = await authService.GetUserWithRememberMeToken(
+            rememberMeToken
+        );
+
+        if (user is null)
+            return null;
+
+        var session = await authService.CreateWeakSession(user.Id);
+
+        this.Context.SetSession(session, user);
+
+        if (newRememberMeToken is not null)
+            this.Context.SetRememberMeToken(newRememberMeToken);
+
+        return user;
     }
 }

Femto.Api/Controllers/Auth/AuthController.cs

@@ -1,95 +1,174 @@
-using Femto.Api.Auth;
 using Femto.Api.Sessions;
 using Femto.Common;
 using Femto.Modules.Auth.Application;
-using Femto.Modules.Auth.Application.Dto;
-using Femto.Modules.Auth.Application.Interface.CreateSignupCode;
-using Femto.Modules.Auth.Application.Interface.GetSignupCodesQuery;
-using Femto.Modules.Auth.Application.Interface.Login;
-using Femto.Modules.Auth.Application.Interface.RefreshUserSession;
-using Femto.Modules.Auth.Application.Interface.Register;
 using Femto.Modules.Auth.Contracts;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Options;
 
 namespace Femto.Api.Controllers.Auth;
 
 [ApiController]
 [Route("auth")]
-public class AuthController(
-    IAuthModule authModule,
-    IOptions<CookieSettings> cookieSettings,
-    ICurrentUserContext currentUserContext,
-    ILogger<AuthController> logger
-) : ControllerBase
+public class AuthController(ICurrentUserContext currentUserContext, IAuthService authService)
+    : ControllerBase
 {
     [HttpPost("login")]
-    public async Task<ActionResult<LoginResponse>> Login([FromBody] LoginRequest request)
+    public async Task<ActionResult<LoginResponse>> Login(
+        [FromBody] LoginRequest request,
+        CancellationToken cancellationToken
+    )
     {
-        var result = await authModule.Command(new LoginCommand(request.Username, request.Password));
-
-        HttpContext.SetSession(result.Session, result.User, logger);
-
-        return new LoginResponse(
-            result.User.Id,
-            result.User.Username,
-            result.User.Roles.Any(r => r == Role.SuperUser)
+        var result = await authService.AuthenticateUserCredentials(
+            request.Username,
+            request.Password,
+            cancellationToken
         );
+
+        if (result is null)
+            return this.BadRequest();
+
+        var (user, session) = result;
+
+        HttpContext.SetSession(session, user);
+
+        if (request.RememberMe)
+        {
+            var newRememberMeToken = await authService.CreateRememberMeToken(user.Id);
+            HttpContext.SetRememberMeToken(newRememberMeToken);
+        }
+
+        return new LoginResponse(user.Id, user.Username, user.Roles.Any(r => r == Role.SuperUser));
     }
 
     [HttpPost("register")]
-    public async Task<ActionResult<RegisterResponse>> Register([FromBody] RegisterRequest request)
+    public async Task<ActionResult<RegisterResponse>> Register(
+        [FromBody] RegisterRequest request,
+        CancellationToken cancellationToken
+    )
     {
-        var result = await authModule.Command(
-            new RegisterCommand(request.Username, request.Password, request.SignupCode)
+        var (user, session) = await authService.CreateUserWithCredentials(
+            request.Username,
+            request.Password,
+            request.SignupCode,
+            cancellationToken
         );
 
-        HttpContext.SetSession(result.Session, result.User, logger);
+        HttpContext.SetSession(session, user);
+
+        if (request.RememberMe)
+        {
+            var newRememberMeToken = await authService.CreateRememberMeToken(user.Id);
+            HttpContext.SetRememberMeToken(newRememberMeToken);
+        }
 
         return new RegisterResponse(
-            result.User.Id,
-            result.User.Username,
-            result.User.Roles.Any(r => r == Role.SuperUser)
+            user.Id,
+            user.Username,
+            user.Roles.Any(r => r == Role.SuperUser)
         );
     }
 
+    [HttpPost("change-password")]
+    public async Task<ActionResult> ChangePassword(
+        [FromBody] ChangePasswordRequestBody req,
+        CancellationToken cancellationToken
+    )
+    {
+        if (currentUserContext.CurrentUser is not {} user)
+            return this.BadRequest();
+
+        // superuser do what superuser want
+        if (!user.IsSuperUser)
+        {
+            if (user.Id != req.UserId)
+                return this.BadRequest();
+
+            var session = await authService.GetSession(this.HttpContext.GetSessionId()!);
+
+            // require strong authentication to change password
+            // the user can re-enter their password
+            if (session is null || !session.IsStronglyAuthenticated)
+                return this.BadRequest();
+        }
+
+        await authService.ChangePassword(req.UserId, req.NewPassword, cancellationToken);
+
+        // TODO would be better do handle this from inside the auth service. maybe just have it happen in a post-save event handler?
+        await authService.InvalidateUserSessions(req.UserId, cancellationToken);
+
+        return this.Ok(new {});
+    }
+
+    [HttpPost("delete-current-session")]
+    public async Task<ActionResult> DeleteSessionV2()
+    {
+        var sessionId = HttpContext.GetSessionId();
+
+        if (sessionId is not null)
+        {
+            await authService.DeleteSession(sessionId);
+            HttpContext.DeleteSession();
+        }
+
+        var rememberMeToken = HttpContext.GetRememberMeToken();
+
+        if (rememberMeToken is not null)
+        {
+            await authService.DeleteRememberMeToken(rememberMeToken);
+            HttpContext.DeleteRememberMeToken();
+        }
+
+        return Ok(new { });
+    }
+
+    [Obsolete("use POST /auth/delete-current-session")]
     [HttpDelete("session")]
     public async Task<ActionResult> DeleteSession()
     {
-        HttpContext.DeleteSession();
+        var sessionId = HttpContext.GetSessionId();
+
+        if (sessionId is not null)
+        {
+            await authService.DeleteSession(sessionId);
+            HttpContext.DeleteSession();
+        }
+
+        var rememberMeToken = HttpContext.GetRememberMeToken();
+
+        if (rememberMeToken is not null)
+        {
+            await authService.DeleteRememberMeToken(rememberMeToken);
+            HttpContext.DeleteRememberMeToken();
+        }
+
         return Ok(new { });
     }
 
     [HttpGet("user/{userId}")]
     [Authorize]
-    public async Task<ActionResult<RefreshUserResult>> RefreshUser(
+    public async Task<ActionResult<GetUserInfoResult>> GetUserInfo(
         Guid userId,
         CancellationToken cancellationToken
     )
     {
-        var currentUser = currentUserContext.CurrentUser!;
+        var currentUser = currentUserContext.CurrentUser;
 
-        try
-        {
-            var result = await authModule.Command(
-                new RefreshUserSessionCommand(userId, currentUser),
-                cancellationToken
-            );
+        if (currentUser is null || currentUser.Id != userId)
+            return this.BadRequest();
 
-            return new RefreshUserResult(
-                result.User.Id,
-                result.User.Username,
-                result.User.Roles.Any(r => r == Role.SuperUser)
-            );
-        }
-        catch (Exception)
-        {
-            HttpContext.DeleteSession();
-            return this.Forbid();
-        }
+        var user = await authService.GetUserWithId(userId, cancellationToken);
+
+        if (user is null)
+            return this.BadRequest();
+
+        return new GetUserInfoResult(
+            user.Id,
+            user.Username,
+            user.Roles.Any(r => r == Role.SuperUser)
+        );
     }
 
+    [Obsolete("use POST /auth/create-signup-code")]
     [HttpPost("signup-codes")]
     [Authorize(Roles = "SuperUser")]
     public async Task<ActionResult> CreateSignupCode(
@@ -97,21 +176,51 @@ public class AuthController(
         CancellationToken cancellationToken
     )
     {
-        await authModule.Command(
-            new CreateSignupCodeCommand(request.Code, request.Email, request.Name),
-            cancellationToken
-        );
+        await authService.AddSignupCode(request.Code, request.Name, cancellationToken);
 
         return Ok(new { });
     }
 
+    [Obsolete("use GET /auth/list-signup-codes")]
     [HttpGet("signup-codes")]
     [Authorize(Roles = "SuperUser")]
     public async Task<ActionResult<ListSignupCodesResult>> ListSignupCodes(
         CancellationToken cancellationToken
     )
     {
-        var codes = await authModule.Query(new GetSignupCodesQuery(), cancellationToken);
+        var codes = await authService.GetSignupCodes(cancellationToken);
+
+        return new ListSignupCodesResult(
+            codes.Select(c => new SignupCodeDto(
+                c.Code,
+                c.Email,
+                c.Name,
+                c.RedeemedByUserId,
+                c.RedeemedByUsername,
+                c.ExpiresOn
+            ))
+        );
+    }
+
+    [HttpPost("create-signup-code")]
+    [Authorize(Roles = "SuperUser")]
+    public async Task<ActionResult> CreateSignupCodeV2(
+        [FromBody] CreateSignupCodeRequest request,
+        CancellationToken cancellationToken
+    )
+    {
+        await authService.AddSignupCode(request.Code, request.Name, cancellationToken);
+
+        return Ok(new { });
+    }
+
+    [HttpGet("list-signup-codes")]
+    [Authorize(Roles = "SuperUser")]
+    public async Task<ActionResult<ListSignupCodesResult>> ListSignupCodesV2(
+        CancellationToken cancellationToken
+    )
+    {
+        var codes = await authService.GetSignupCodes(cancellationToken);
 
         return new ListSignupCodesResult(
             codes.Select(c => new SignupCodeDto(

Femto.Api/Controllers/Auth/ChangePasswordRequestBody.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Auth;
+
+public record ChangePasswordRequestBody(Guid UserId, string NewPassword);

Femto.Api/Controllers/Auth/GetUserInfoResult.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Auth;
+
+public record GetUserInfoResult(Guid UserId, string Username, bool IsSuperUser);

Femto.Api/Controllers/Auth/LoginRequest.cs

@@ -1,3 +1,3 @@
 namespace Femto.Api.Controllers.Auth;
 
-public record LoginRequest(string Username, string Password);
+public record LoginRequest(string Username, string Password, bool RememberMe);

Femto.Api/Controllers/Auth/RefreshUserResult.cs

@@ -1,3 +0,0 @@
-namespace Femto.Api.Controllers.Auth;
-
-public record RefreshUserResult(Guid UserId, string Username, bool IsSuperUser);

Femto.Api/Controllers/Auth/RegisterRequest.cs

@@ -1,3 +1,3 @@
 namespace Femto.Api.Controllers.Auth;
 
-public record RegisterRequest(string Username, string Password, string SignupCode, string? Email);
+public record RegisterRequest(string Username, string Password, string SignupCode, bool RememberMe);

Femto.Api/Controllers/Posts/Dto/AddPostCommentRequest.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Posts.Dto;
+
+public record AddPostCommentRequest(Guid AuthorId, string Content);

Femto.Api/Controllers/Posts/Dto/AddPostReactionRequest.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Posts.Dto;
+
+public record AddPostReactionRequest(string Emoji);

Femto.Api/Controllers/Posts/Dto/CreatePostResponse.cs

@@ -1,3 +1,3 @@
 namespace Femto.Api.Controllers.Posts.Dto;
 
-public record CreatePostResponse(Guid PostId);
+public record CreatePostResponse(PostDto Post);

Femto.Api/Controllers/Posts/Dto/DeletePostReactionRequest.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Posts.Dto;
+
+public record DeletePostReactionRequest(string Emoji);

Femto.Api/Controllers/Posts/Dto/GetPostResponse.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Posts.Dto;
+
+public record GetPostResponse(PostDto Post);

Femto.Api/Controllers/Posts/Dto/GetPublicPostsSearchParams.cs

@@ -3,4 +3,4 @@ using JetBrains.Annotations;
 namespace Femto.Api.Controllers.Posts.Dto;
 
 [PublicAPI]
-public record GetPublicPostsSearchParams(Guid? From, int? Amount, Guid? AuthorId, string? Author);
+public record GetPublicPostsSearchParams(Guid? After, int? Amount, Guid? AuthorId, string? Author);

Femto.Api/Controllers/Posts/Dto/LoadPostsResponse.cs

@@ -3,4 +3,4 @@ using JetBrains.Annotations;
 namespace Femto.Api.Controllers.Posts.Dto;
 
 [PublicAPI]
-public record GetAllPublicPostsResponse(IEnumerable<PostDto> Posts, Guid? Next);
+public record LoadPostsResponse(IEnumerable<PostDto> Posts);

Femto.Api/Controllers/Posts/Dto/PostCommentDto.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Posts.Dto;
+
+public record PostCommentDto(string Author, string Content, DateTimeOffset PostedOn);

Femto.Api/Controllers/Posts/Dto/PostDto.cs

@@ -8,5 +8,21 @@ public record PostDto(
     Guid PostId,
     string Content,
     IEnumerable<PostMediaDto> Media,
-    DateTimeOffset CreatedAt
-);
+    IEnumerable<PostReactionDto> Reactions,
+    DateTimeOffset CreatedAt,
+    IEnumerable<string> PossibleReactions,
+    IEnumerable<PostCommentDto> Comments
+)
+{
+    public static PostDto FromModel(Modules.Blog.Application.Queries.GetPosts.Dto.PostDto post) =>
+        new(
+            new PostAuthorDto(post.Author.AuthorId, post.Author.Username),
+            post.PostId,
+            post.Text,
+            post.Media.Select(m => new PostMediaDto(m.Url, m.Width, m.Height)),
+            post.Reactions.Select(r => new PostReactionDto(r.Emoji, r.AuthorName, r.ReactedOn)),
+            post.CreatedAt,
+            post.PossibleReactions,
+            post.Comments.Select(c => new PostCommentDto(c.Author, c.Content, c.PostedOn))
+        );
+}

Femto.Api/Controllers/Posts/Dto/PostReactionDto.cs

@@ -0,0 +1,3 @@
+namespace Femto.Api.Controllers.Posts.Dto;
+
+public record PostReactionDto(string Emoji, string AuthorName, DateTimeOffset ReactedOn);

Femto.Api/Controllers/Posts/PostsController.cs

@@ -1,6 +1,9 @@
 using Femto.Api.Controllers.Posts.Dto;
 using Femto.Common;
 using Femto.Modules.Blog.Application;
+using Femto.Modules.Blog.Application.Commands.AddPostComment;
+using Femto.Modules.Blog.Application.Commands.AddPostReaction;
+using Femto.Modules.Blog.Application.Commands.ClearPostReaction;
 using Femto.Modules.Blog.Application.Commands.CreatePost;
 using Femto.Modules.Blog.Application.Commands.DeletePost;
 using Femto.Modules.Blog.Application.Queries.GetPosts;
@@ -11,10 +14,11 @@ namespace Femto.Api.Controllers.Posts;
 
 [ApiController]
 [Route("posts")]
-public class PostsController(IBlogModule blogModule, ICurrentUserContext currentUserContext) : ControllerBase
+public class PostsController(IBlogModule blogModule, ICurrentUserContext currentUserContext, IAuthorizationService auth)
+    : ControllerBase
 {
     [HttpGet]
-    public async Task<ActionResult<GetAllPublicPostsResponse>> LoadPosts(
+    public async Task<ActionResult<LoadPostsResponse>> LoadPosts(
         [FromQuery] GetPublicPostsSearchParams searchParams,
         CancellationToken cancellationToken
     )
@@ -22,7 +26,7 @@ public class PostsController(IBlogModule blogModule, ICurrentUserContext current
         var res = await blogModule.Query(
             new GetPostsQuery(currentUserContext.CurrentUser?.Id)
             {
-                From = searchParams.From,
+                After = searchParams.After,
                 Amount = searchParams.Amount ?? 20,
                 AuthorId = searchParams.AuthorId,
                 Author = searchParams.Author,
@@ -30,16 +34,7 @@ public class PostsController(IBlogModule blogModule, ICurrentUserContext current
             cancellationToken
         );
 
-        return new GetAllPublicPostsResponse(
-            res.Posts.Select(p => new PostDto(
-                new PostAuthorDto(p.Author.AuthorId, p.Author.Username),
-                p.PostId,
-                p.Text,
-                p.Media.Select(m => new PostMediaDto(m.Url, m.Width, m.Height)),
-                p.CreatedAt
-            )),
-            res.Next
-        );
+        return new LoadPostsResponse(res.Posts.Select(PostDto.FromModel));
     }
 
     [HttpPost]
@@ -49,7 +44,7 @@ public class PostsController(IBlogModule blogModule, ICurrentUserContext current
         CancellationToken cancellationToken
     )
     {
-        var guid = await blogModule.Command(
+        var post = await blogModule.Command(
             new CreatePostCommand(
                 req.AuthorId,
                 req.Content,
@@ -64,18 +59,96 @@ public class PostsController(IBlogModule blogModule, ICurrentUserContext current
                             media.Height
                         )
                 ),
-                req.IsPublic
+                req.IsPublic,
+                currentUserContext.CurrentUser!
             ),
             cancellationToken
         );
 
-        return new CreatePostResponse(guid);
+        return new CreatePostResponse(PostDto.FromModel(post));
+    }
+
+    [HttpGet("{postId}")]
+    public async Task<ActionResult<GetPostResponse>> GetPost(
+        Guid postId,
+        CancellationToken cancellationToken
+    )
+    {
+        var result = await blogModule.Query(
+            new GetPostsQuery(postId, currentUserContext.CurrentUser?.Id),
+            cancellationToken
+        );
+
+        var post = result.Posts.SingleOrDefault();
+
+        if (post is null)
+            return NotFound();
+
+        return new GetPostResponse(PostDto.FromModel(post));
     }
 
     [HttpDelete("{postId}")]
     [Authorize]
     public async Task DeletePost(Guid postId, CancellationToken cancellationToken)
     {
-        await blogModule.Command(new DeletePostCommand(postId, currentUserContext.CurrentUser!.Id), cancellationToken);
+        await blogModule.Command(
+            new DeletePostCommand(postId, currentUserContext.CurrentUser!.Id),
+            cancellationToken
+        );
+    }
+
+    [HttpPost("{postId}/reactions")]
+    [Authorize]
+    public async Task<ActionResult> AddPostReaction(
+        Guid postId,
+        [FromBody] AddPostReactionRequest request,
+        CancellationToken cancellationToken
+    )
+    {
+        var currentUser = currentUserContext.CurrentUser!;
+
+        await blogModule.Command(
+            new AddPostReactionCommand(postId, request.Emoji, currentUser.Id),
+            cancellationToken
+        );
+
+        return this.Ok();
+    }
+
+    [HttpDelete("{postId}/reactions")]
+    [Authorize]
+    public async Task<ActionResult> DeletePostReaction(
+        Guid postId,
+        [FromBody] DeletePostReactionRequest request,
+        CancellationToken cancellationToken
+    )
+    {
+        var currentUser = currentUserContext.CurrentUser!;
+
+        await blogModule.Command(
+            new ClearPostReactionCommand(postId, request.Emoji, currentUser.Id),
+            cancellationToken
+        );
+
+        return this.Ok();
+    }
+
+    [HttpPost("{postId}/comments")]
+    [Authorize]
+    public async Task<ActionResult> AddPostComment(
+        Guid postId,
+        [FromBody] AddPostCommentRequest request,
+        CancellationToken cancellationToken
+    )
+    {
+        if (currentUserContext.CurrentUser?.Id != request.AuthorId)
+            return this.BadRequest();
+        
+        await blogModule.Command(
+            new AddPostCommentCommand(postId, request.AuthorId, request.Content),
+            cancellationToken
+        );
+
+        return this.Ok();
     }
 }

Femto.Api/Program.cs

@@ -46,7 +46,7 @@ builder.Services.AddHostedService(_ => eventBus);
 
 builder.Services.InitializeBlogModule(connectionString, eventBus, loggerFactory);
 builder.Services.InitializeMediaModule(connectionString, blobStorageRoot);
-builder.Services.InitializeAuthenticationModule(connectionString, eventBus, loggerFactory);
+builder.Services.InitializeAuthenticationModule(connectionString, eventBus, loggerFactory, TimeProvider.System);
 
 builder.Services.AddScoped<CurrentUserContext, CurrentUserContext>();
 builder.Services.AddScoped<ICurrentUserContext>(s => s.GetRequiredService<CurrentUserContext>());

Femto.Api/Properties/launchSettings.json

@@ -14,7 +14,7 @@
       "commandName": "Project",
       "dotnetRunMessages": true,
       "launchBrowser": false,
-      "applicationUrl": "https://0.0.0.0:7269;http://0.0.0.0:5181",
+      "applicationUrl": "https://localhost:7269",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }

Femto.Api/Sessions/HttpContextSessionExtensions.cs

@@ -1,60 +1,52 @@
 using System.Text.Json;
-using System.Text.Json.Serialization;
 using Femto.Api.Auth;
 using Femto.Modules.Auth.Application.Dto;
+using Femto.Modules.Auth.Models;
 using Microsoft.Extensions.Options;
 
 namespace Femto.Api.Sessions;
 
+internal record SessionInfo(string? SessionId, Guid? UserId);
+
 internal static class HttpContextSessionExtensions
 {
-    public static void SetSession(this HttpContext httpContext, Session session, UserInfo user, ILogger logger)
+    private static readonly JsonSerializerOptions JsonOptions = new()
     {
-        var cookieSettings = httpContext.RequestServices.GetService<IOptions<CookieSettings>>();
-        
-        var secure = cookieSettings?.Value.Secure ?? true;
-        var sameSite = secure ? SameSiteMode.None : SameSiteMode.Unspecified;
-        var domain = cookieSettings?.Value.Domain;
-        var expires = session.Expires;
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+    };
 
-        logger.LogInformation(
-            "cookie settings: Secure={Secure}, SameSite={SameSite}, domain={Domain}, Expires={Expires}",
-            secure,
-            sameSite,
-            domain,
-            expires
-        );
+    public static string? GetSessionId(this HttpContext httpContext) =>
+        httpContext.Request.Cookies["sid"];
 
-        httpContext.Response.Cookies.Append(
-            "session",
-            session.SessionId,
+    public static void SetSession(this HttpContext context, Session session, UserInfo user)
+    {
+        var cookieSettings = context.RequestServices.GetRequiredService<IOptions<CookieSettings>>();
+
+        context.Response.Cookies.Append(
+            "sid",
+            session.Id,
             new CookieOptions
             {
+                Path = "/",
                 IsEssential = true,
-                Domain = domain,
+                Domain = cookieSettings.Value.Domain,
                 HttpOnly = true,
-                Secure = secure,
-                SameSite = sameSite,
-                Expires = expires,
+                Secure = cookieSettings.Value.Secure,
+                SameSite = cookieSettings.Value.SameSite,
+                Expires = session.Expires,
             }
         );
 
-        httpContext.Response.Cookies.Append(
+        context.Response.Cookies.Append(
             "user",
-            JsonSerializer.Serialize(
-                user,
-                new JsonSerializerOptions
-                {
-                    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-                    Converters = { new JsonStringEnumConverter() },
-                }
-            ),
+            JsonSerializer.Serialize(user, JsonOptions),
             new CookieOptions
             {
-                Domain = domain,
+                Path = "/",
+                Domain = cookieSettings.Value.Domain,
                 IsEssential = true,
-                Secure = secure,
-                SameSite = sameSite,
+                Secure = cookieSettings.Value.Secure,
+                SameSite = cookieSettings.Value.SameSite,
                 Expires = session.Expires,
             }
         );
@@ -62,28 +54,78 @@ internal static class HttpContextSessionExtensions
 
     public static void DeleteSession(this HttpContext httpContext)
     {
-        var cookieSettings = httpContext.RequestServices.GetService<IOptions<CookieSettings>>();
-        
-        var secure = cookieSettings?.Value.Secure ?? true;
-        var sameSite = secure ? SameSiteMode.None : SameSiteMode.Unspecified;
-        var domain = cookieSettings?.Value.Domain;
-        
-        httpContext.Response.Cookies.Delete("session", new CookieOptions
-        {
-            HttpOnly = true,
-            Domain = domain,
-            IsEssential = true,
-            Secure = secure,
-            SameSite = sameSite,
-            Expires = DateTimeOffset.UtcNow.AddDays(-1),
-        });
-        httpContext.Response.Cookies.Delete("user", new CookieOptions
-        {
-            Domain = domain,
-            IsEssential = true,
-            Secure = secure,
-            SameSite = sameSite,
-            Expires = DateTimeOffset.UtcNow.AddDays(-1),
-        });
+        var cookieSettings = httpContext.RequestServices.GetRequiredService<
+            IOptions<CookieSettings>
+        >();
+
+        httpContext.Response.Cookies.Delete(
+            "sid",
+            new CookieOptions
+            {
+                Path = "/",
+                HttpOnly = true,
+                Domain = cookieSettings.Value.Domain,
+                IsEssential = true,
+                Secure = cookieSettings.Value.Secure,
+                SameSite = cookieSettings.Value.SameSite,
+                Expires = DateTimeOffset.UtcNow.AddDays(-1),
+            }
+        );
+
+        httpContext.Response.Cookies.Delete(
+            "user",
+            new CookieOptions
+            {
+                Path = "/",
+                Domain = cookieSettings.Value.Domain,
+                IsEssential = true,
+                Secure = cookieSettings.Value.Secure,
+                SameSite = cookieSettings.Value.SameSite,
+                Expires = DateTimeOffset.UtcNow.AddDays(-1),
+            }
+        );
+    }
+    
+    
+    public static RememberMeToken? GetRememberMeToken(this HttpContext httpContext) =>
+        httpContext.Request.Cookies["rid"] is { } code ? RememberMeToken.FromCode(code) : null;
+
+    public static void SetRememberMeToken(this HttpContext context, NewRememberMeToken token)
+    {
+        var cookieSettings = context.RequestServices.GetRequiredService<IOptions<CookieSettings>>();
+
+        context.Response.Cookies.Append(
+            "rid",
+            token.Code,
+            new CookieOptions
+            {
+                Path = "/",
+                IsEssential = true,
+                Domain = cookieSettings.Value.Domain,
+                HttpOnly = true,
+                Secure = cookieSettings.Value.Secure,
+                SameSite = cookieSettings.Value.SameSite,
+                Expires = token.Expires,
+            }
+        );
+    }
+
+    public static void DeleteRememberMeToken(this HttpContext context)
+    {
+        var cookieSettings = context.RequestServices.GetRequiredService<IOptions<CookieSettings>>();
+
+        context.Response.Cookies.Delete(
+            "rid",
+            new CookieOptions
+            {
+                Path = "/",
+                HttpOnly = true,
+                Domain = cookieSettings.Value.Domain,
+                IsEssential = true,
+                Secure = cookieSettings.Value.Secure,
+                SameSite = cookieSettings.Value.SameSite,
+                Expires = DateTimeOffset.UtcNow.AddDays(-1),
+            }
+        );
     }
 }

Femto.Common/ICurrentUserContext.cs

@@ -5,4 +5,4 @@ public interface ICurrentUserContext
     CurrentUser? CurrentUser { get; }
 }
 
-public record CurrentUser(Guid Id, string Username, string SessionId);
+public record CurrentUser(Guid Id, string Username, bool IsSuperUser);

Femto.Common/Infrastructure/DDDPipelineBehaviour.cs

@@ -5,10 +5,10 @@ using Microsoft.Extensions.Logging;
 
 namespace Femto.Common.Infrastructure;
 
-public class SaveChangesPipelineBehaviour<TRequest, TResponse>(
+public class DDDPipelineBehaviour<TRequest, TResponse>(
     DbContext context,
     IPublisher publisher,
-    ILogger<SaveChangesPipelineBehaviour<TRequest, TResponse>> logger
+    ILogger<DDDPipelineBehaviour<TRequest, TResponse>> logger
 ) : IPipelineBehavior<TRequest, TResponse>
     where TRequest : notnull
 {
@@ -18,7 +18,12 @@ public class SaveChangesPipelineBehaviour<TRequest, TResponse>(
         CancellationToken cancellationToken
     )
     {
+        logger.LogDebug("handling request {Type}", typeof(TRequest).Name);
         var response = await next(cancellationToken);
+        
+        var hasChanges = context.ChangeTracker.HasChanges();
+        logger.LogDebug("request handled. Changes? {HasChanges}", hasChanges);
+        
         if (context.ChangeTracker.HasChanges())
         {
             await context.EmitDomainEvents(logger, publisher, cancellationToken);

Femto.Common/Infrastructure/DomainServiceExtensions.cs

@@ -12,7 +12,7 @@ public static class DomainServiceExtensions
         services.AddScoped<DbContext>(s => s.GetRequiredService<TContext>());
         services.AddTransient(
             typeof(IPipelineBehavior<,>),
-            typeof(SaveChangesPipelineBehaviour<,>)
+            typeof(DDDPipelineBehaviour<,>)
         );
         
     }

Femto.Common/ScopeBinding.cs

@@ -3,19 +3,24 @@ using Microsoft.Extensions.Logging;
 
 namespace Femto.Common;
 
+
 /// <summary>
 /// We use this to bind a scope to the request scope in the composition root
 /// Any scoped services provided by this subcontainer should be accessed via a ScopeBinding injected in the host
 /// </summary>
 /// <param name="scope"></param>
-public class ScopeBinding<T>(IServiceScope scope) : IDisposable
-    where T : notnull
+public class ScopeBinding(IServiceScope scope) : IDisposable
 {
-    public T GetService() {
-        return scope.ServiceProvider.GetRequiredService<T>();
+    private IServiceScope Scope { get; } = scope;
+
+    public T GetService<T>()
+        where T : notnull
+    {
+        return this.Scope.ServiceProvider.GetRequiredService<T>();
     }
 
-    public void Dispose() {
-        scope.Dispose();
+    public virtual void Dispose()
+    {
+        this.Scope.Dispose();
     }
 }

Femto.Database/Migrations/20250518193113_AddUserRole.sql

@@ -6,4 +6,4 @@ CREATE TABLE authn.user_role
     user_id uuid REFERENCES authn.user_identity(id),
     role    int,
     primary key (user_id, role)
-);
+)

Femto.Database/Migrations/20250526220032_AddReactions.sql

@@ -0,0 +1,13 @@
+-- Migration: AddReactions
+-- Created at: 26/05/2025 22:00:32
+
+ALTER TABLE blog.post
+ADD COLUMN possible_reactions TEXT;
+
+CREATE TABLE blog.post_reaction
+(
+    post_id uuid REFERENCES blog.post(id),
+    author_id uuid REFERENCES blog.author(id),
+    emoji text not null,
+    primary key (post_id, author_id, emoji)
+);

Femto.Database/Migrations/20250529101346_SessionsRework.sql

@@ -0,0 +1,13 @@
+-- Migration: addLongTermSessions
+-- Created at: 29/05/2025 10:13:46
+
+DROP TABLE authn.user_session;
+
+CREATE TABLE authn.long_term_session
+(
+    id              serial PRIMARY KEY,
+    selector        varchar(16) NOT NULL,
+    hashed_verifier bytea       NOT NULL,
+    expires         timestamptz not null,
+    user_id         uuid REFERENCES authn.user_identity (id)
+);

Femto.Database/Migrations/20250719104200_AddInvalidateToLongTermSession.sql

@@ -0,0 +1,5 @@
+-- Migration: AddInvalidateToLongTermSession
+-- Created at: 19/07/2025 10:42:00
+
+ALTER TABLE authn.long_term_session
+ADD COLUMN is_invalidated BOOLEAN NOT NULL DEFAULT FALSE;

Femto.Database/Migrations/20250810152132_AddTimestampToReaction.sql

@@ -0,0 +1,4 @@
+-- Migration: AddTimestampToReaction
+-- Created at: 10/08/2025 15:21:32
+alter table blog.post_reaction
+add column created_at timestamptz;

Femto.Database/Migrations/20250810172242_AddCommentToPost.sql

@@ -0,0 +1,11 @@
+-- Migration: AddCommentToPost
+-- Created at: 10/08/2025 17:22:42
+
+CREATE TABLE blog.post_comment
+(
+    id uuid PRIMARY KEY,
+    post_id uuid REFERENCES blog.post(id),
+    author_id uuid REFERENCES blog.author(id),
+    content TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+)

Femto.Database/Seed/TestDataSeeder.cs

@@ -14,7 +14,7 @@ public static class TestDataSeeder
         var id = Guid.Parse("0196960c-6296-7532-ba66-8fabb38c6ae0");
         var username = "johnbotris";
         var salt = new byte[32];
-        var password = "hunter2"u8;
+        var password = "password"u8;
         var hashInput = new byte[password.Length + salt.Length];
         password.CopyTo(hashInput);
         salt.CopyTo(hashInput, password.Length);
@@ -35,14 +35,15 @@ public static class TestDataSeeder
             ;
 
             INSERT INTO blog.post
-            (id, author_id, content)
+            (id, author_id, possible_reactions, content)
             VALUES
-            ('019691a0-48ed-7eba-b8d3-608e25e07d4b', @id, 'However, authors often misinterpret the zoology as a smothered advantage, when in actuality it feels more like a blindfold accordion. They were lost without the chastest puppy that composed their Santa.'),
-            ('019691a0-4ace-7bb5-a8f3-e3362920eba0', @id, 'Extending this logic, a swim can hardly be considered a seasick duckling without also being a tornado. Some posit the whity voyage to be less than dippy.'),
-            ('019691a0-4c3e-726f-b8f6-bcbaabe789ae', @id,'Few can name a springless sun that isn''t a thudding Vietnam. The burn of a competitor becomes a frosted target.'),
-            ('019691a0-4dd3-7e89-909e-94a6fd19a05e', @id,'Some unwitched marbles are thought of simply as currencies. A boundary sees a nepal as a chordal railway.')
+            ('019691a0-48ed-7eba-b8d3-608e25e07d4b', @id, '["🍆", "🧢", "🧑🏾‍🎓", "🥕", "🕗"]', 'However, authors often misinterpret the zoology as a smothered advantage, when in actuality it feels more like a blindfold accordion. They were lost without the chastest puppy that composed their Santa.'),
+            ('019691a0-4ace-7bb5-a8f3-e3362920eba0', @id, '["🍆", "🧢", "🧑🏾‍🎓", "🥕", "🕗"]', 'Extending this logic, a swim can hardly be considered a seasick duckling without also being a tornado. Some posit the whity voyage to be less than dippy.'),
+            ('019691a0-4c3e-726f-b8f6-bcbaabe789ae', @id, '["🍆", "🧢", "🧑🏾‍🎓", "🥕", "🕗"]', 'Few can name a springless sun that isn''t a thudding Vietnam. The burn of a competitor becomes a frosted target.'),
+            ('019691a0-4dd3-7e89-909e-94a6fd19a05e', @id, '["🍆", "🧢", "🧑🏾‍🎓", "🥕", "🕗"]', 'Some unwitched marbles are thought of simply as currencies. A boundary sees a nepal as a chordal railway.')
             ;
 
+
             INSERT INTO blog.post_media
             (id, post_id, url, ordering)
             VALUES
@@ -54,6 +55,21 @@ public static class TestDataSeeder
             ('019691b6-2608-7088-8110-f0f6e35fa633', '019691a0-4dd3-7e89-909e-94a6fd19a05e', 'https://www.pinclipart.com/picdir/big/535-5356059_big-transparent-chungus-png-background-big-chungus-clipart.png', 0)
             ;
 
+            INSERT INTO blog.post_reaction
+            (post_id, author_id, emoji)
+            VALUES
+            ('019691a0-48ed-7eba-b8d3-608e25e07d4b', @id, '🍆'),
+            ('019691a0-4ace-7bb5-a8f3-e3362920eba0', @id, '🍆'),
+            ('019691a0-4c3e-726f-b8f6-bcbaabe789ae', @id, '🧑🏾‍'),
+            ('019691a0-4c3e-726f-b8f6-bcbaabe789ae', @id, '🕗')
+            ;
+
+            INSERT INTO blog.post_comment
+            (id, post_id, author_id, content)
+            VALUES
+            ('9116da05-49eb-4053-9199-57f54f92e73a', '019691a0-48ed-7eba-b8d3-608e25e07d4b', @id, 'this is a comment!')
+            ;
+
             INSERT INTO authn.user_identity
             (id, username, password_hash, password_salt)
             VALUES

Femto.Docs/Design/Auth/RememberMe.md

@@ -0,0 +1,27 @@
+# Remember me
+
+We want to implement long lived sessions
+
+we will do this with a remember me cookie
+
+this should be implemented as so:
+
+
+logging or registering and including a "rememberMe" flag with the request will generate a new remember me token, which can be stored as a cookie .
+
+the remember me token should live until:
+* the user changes password anywhere
+* the user logs out on that device
+* the user logs in with an expired session, in which case the remember me token will be used to refresh the session, and then it will be swapped out for a new one
+
+that means we need to implement three spots: 
+- [ ] login
+- [ ] register
+- [ ] validate session
+
+we will implement it as described [here](https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence)
+
+we will only check the remember me token in "validate session".
+
+"refresh session" is only called with valid sessions so we do not need to check it here, as the session should already have been validated
+

Femto.Docs/Design/Auth/strong_vs_weak_session.md

@@ -0,0 +1,16 @@
+# Strong vs weak sessions
+
+a **strong** session is one that should have the power to do account level admin tasks like change password
+ 
+
+a **weak** session has strictly fewer privileges than a strong session
+
+## where to get a strong session
+
+a strong session is created when a user provides a username and a password. a session remains strong until it is refreshed, at which point it becomes weak.
+
+## where to get a weak session
+
+A weak session is any session that has not been directly created by user credentials, i.e.:
+* short-term session refresh
+* long-term session refresh

Femto.Modules.Auth/Application/AuthModule.cs

@@ -1,22 +0,0 @@
-using Femto.Common.Domain;
-using MediatR;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-
-namespace Femto.Modules.Auth.Application;
-
-internal class AuthModule(IMediator mediator) : IAuthModule
-{
-    public async Task Command(ICommand command, CancellationToken cancellationToken = default) =>
-        await mediator.Send(command, cancellationToken);
-
-    public async Task<TResponse> Command<TResponse>(
-        ICommand<TResponse> command,
-        CancellationToken cancellationToken = default
-    ) => await mediator.Send(command, cancellationToken);
-
-    public async Task<TResponse> Query<TResponse>(
-        IQuery<TResponse> query,
-        CancellationToken cancellationToken = default
-    ) => await mediator.Send(query, cancellationToken);
-}

Femto.Modules.Auth/Application/AuthService.cs

@@ -0,0 +1,258 @@
+using Dapper;
+using Femto.Common.Domain;
+using Femto.Common.Infrastructure.DbConnection;
+using Femto.Modules.Auth.Application.Dto;
+using Femto.Modules.Auth.Data;
+using Femto.Modules.Auth.Infrastructure;
+using Femto.Modules.Auth.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Femto.Modules.Auth.Application;
+
+internal class AuthService(
+    AuthContext context,
+    SessionStorage sessionStorage,
+    IDbConnectionFactory connectionFactory
+) : IAuthService
+{
+    public async Task<UserAndSession?> AuthenticateUserCredentials(
+        string username,
+        string password,
+        CancellationToken cancellationToken = default
+    )
+    {
+        var user = await context
+            .Users.Where(u => u.Username == username)
+            .SingleOrDefaultAsync(cancellationToken);
+
+        if (user is null)
+            return null;
+
+        if (!user.HasPassword(password))
+            return null;
+
+        var session = new Session(user.Id, true);
+
+        await sessionStorage.AddSession(session);
+
+        return new(
+            new UserInfo(user.Id, user.Username, user.Roles.Select(r => r.Role).ToList()),
+            session
+        );
+    }
+
+    public Task<UserInfo?> GetUserWithId(Guid? userId, CancellationToken cancellationToken)
+    {
+        return context
+            .Users.Where(u => u.Id == userId)
+            .Select(u => new UserInfo(u.Id, u.Username, u.Roles.Select(r => r.Role).ToList()))
+            .SingleOrDefaultAsync(cancellationToken);
+    }
+
+    public async Task<Session> CreateNewSession(Guid userId)
+    {
+        var session = new Session(userId, true);
+
+        await sessionStorage.AddSession(session);
+
+        return session;
+    }
+
+    public async Task<Session> CreateWeakSession(Guid userId)
+    {
+        var session = new Session(userId, false);
+
+        await sessionStorage.AddSession(session);
+
+        return session;
+    }
+
+    public Task<Session?> GetSession(string sessionId)
+    {
+        return sessionStorage.GetSession(sessionId);
+    }
+
+    public async Task DeleteSession(string sessionId)
+    {
+        await sessionStorage.DeleteSession(sessionId);
+    }
+
+    public async Task<UserAndSession> CreateUserWithCredentials(
+        string username,
+        string password,
+        string signupCode,
+        CancellationToken cancellationToken = default
+    )
+    {
+        var now = DateTimeOffset.UtcNow;
+
+        var code = await context
+            .SignupCodes.Where(c => c.Code == signupCode)
+            .Where(c => c.ExpiresAt == null || c.ExpiresAt > now)
+            .Where(c => c.RedeemingUserId == null)
+            .SingleOrDefaultAsync(cancellationToken);
+
+        if (code is null)
+            throw new DomainError("invalid signup code");
+
+        var usernameTaken = await context.Users.AnyAsync(
+            u => u.Username == username,
+            cancellationToken
+        );
+
+        if (usernameTaken)
+            throw new DomainError("username taken");
+
+        var user = new UserIdentity(username);
+
+        await context.AddAsync(user, cancellationToken);
+
+        user.SetPassword(password);
+
+        code.Redeem(user.Id);
+
+        var session = new Session(user.Id, true);
+
+        await sessionStorage.AddSession(session);
+
+        await context.SaveChangesAsync(cancellationToken);
+
+        return new(new UserInfo(user), session);
+    }
+
+    public async Task AddSignupCode(
+        string code,
+        string recipientName,
+        CancellationToken cancellationToken
+    )
+    {
+        await context.SignupCodes.AddAsync(
+            new SignupCode("", recipientName, code),
+            cancellationToken
+        );
+
+        await context.SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task<ICollection<SignupCodeDto>> GetSignupCodes(
+        CancellationToken cancellationToken = default
+    )
+    {
+        using var conn = connectionFactory.GetConnection();
+
+        // lang=sql
+        const string sql = """
+            SELECT 
+                sc.code as Code,
+                sc.recipient_email as Email,
+                sc.recipient_name as Name,
+                sc.redeeming_user_id as RedeemedByUserId,
+                u.username as RedeemedByUsername,
+                sc.expires_at as ExpiresOn
+            FROM authn.signup_code sc
+            LEFT JOIN authn.user_identity u ON u.id = sc.redeeming_user_id
+            ORDER BY sc.created_at DESC
+            """;
+
+        var result = await conn.QueryAsync<GetSignupCodesQueryResultRow>(sql, cancellationToken);
+
+        return result
+            .Select(row => new SignupCodeDto(
+                row.Code,
+                row.Email,
+                row.Name,
+                row.RedeemedByUserId,
+                row.RedeemedByUsername,
+                row.ExpiresOn
+            ))
+            .ToList();
+    }
+
+    public async Task<NewRememberMeToken> CreateRememberMeToken(Guid userId)
+    {
+        var (rememberMeToken, verifier) = LongTermSession.Create(userId);
+
+        await context.AddAsync(rememberMeToken);
+        await context.SaveChangesAsync();
+
+        return new(rememberMeToken.Selector, verifier, rememberMeToken.Expires);
+    }
+
+    public async Task<(UserInfo?, NewRememberMeToken?)> GetUserWithRememberMeToken(
+        RememberMeToken rememberMeToken
+    )
+    {
+        var token = await context.LongTermSessions.SingleOrDefaultAsync(t =>
+            t.Selector == rememberMeToken.Selector
+        );
+
+        if (token is null)
+            return (null, null);
+
+        if (!token.CheckVerifier(rememberMeToken.Verifier))
+            return (null, null);
+
+        var user = await context.Users.SingleOrDefaultAsync(u => u.Id == token.UserId);
+
+        if (user is null)
+            return (null, null);
+
+        if (token.ExpiresSoon)
+        {
+            var (newToken, verifier) = LongTermSession.Create(user.Id);
+            await context.AddAsync(newToken);
+            await context.SaveChangesAsync();
+
+            return (new(user), new(newToken.Selector, verifier, newToken.Expires));
+        }
+
+        return (new(user), null);
+    }
+
+    public async Task DeleteRememberMeToken(RememberMeToken rememberMeToken)
+    {
+        var session = await context.LongTermSessions.SingleOrDefaultAsync(s =>
+            s.Selector == rememberMeToken.Selector
+        );
+
+        if (session is null)
+            return;
+
+        if (!session.CheckVerifier(rememberMeToken.Verifier))
+            return;
+
+        context.Remove(session);
+        await context.SaveChangesAsync();
+    }
+
+    public async Task ChangePassword(Guid userId, string password, CancellationToken cancellationToken)
+    {
+        // change the password
+        // invalidate long term sessions
+        // invalidate sessions
+
+        var user = await context.Users.SingleOrDefaultAsync(u => u.Id == userId,cancellationToken);
+
+        if (user is null)
+            throw new DomainError("invalid user");
+
+        user.SetPassword(password);
+
+        await context.SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task InvalidateUserSessions(Guid userId, CancellationToken cancellationToken)
+    {
+        await sessionStorage.InvalidateUserSessions(userId);
+    }
+
+    private class GetSignupCodesQueryResultRow
+    {
+        public string Code { get; set; }
+        public string Email { get; set; }
+        public string Name { get; set; }
+        public Guid? RedeemedByUserId { get; set; }
+        public string? RedeemedByUsername { get; set; }
+        public DateTimeOffset? ExpiresOn { get; set; }
+    }
+}

Femto.Modules.Auth/Application/AuthStartup.cs

@@ -20,20 +20,29 @@ public static class AuthStartup
         this IServiceCollection rootContainer,
         string connectionString,
         IEventBus eventBus,
-        ILoggerFactory loggerFactory
+        ILoggerFactory loggerFactory,
+        TimeProvider timeProvider
     )
     {
         var hostBuilder = Host.CreateDefaultBuilder();
+
         hostBuilder.ConfigureServices(services =>
-            ConfigureServices(services, connectionString, eventBus, loggerFactory)
+            ConfigureServices(services, connectionString, eventBus, loggerFactory, timeProvider)
         );
+
         var host = hostBuilder.Build();
 
-        rootContainer.AddScoped(_ => new ScopeBinding<IAuthModule>(host.Services.CreateScope()));
-        rootContainer.AddScoped(services =>
-            services.GetRequiredService<ScopeBinding<IAuthModule>>().GetService()
+        rootContainer.AddKeyedScoped<ScopeBinding>(
+            "AuthServiceScope",
+            (s, o) =>
+            {
+                var scope = host.Services.CreateScope();
+                return new ScopeBinding(scope);
+            }
         );
 
+        rootContainer.ExposeScopedService<IAuthService>();
+
         rootContainer.AddHostedService(services => new AuthApplication(host));
         eventBus.Subscribe(
             (evt, cancellationToken) => EventSubscriber(evt, host.Services, cancellationToken)
@@ -44,9 +53,12 @@ public static class AuthStartup
         IServiceCollection services,
         string connectionString,
         IEventPublisher publisher,
-        ILoggerFactory loggerFactory
+        ILoggerFactory loggerFactory,
+        TimeProvider timeProvider
     )
     {
+        services.AddSingleton(timeProvider);
+
         services.AddTransient<IDbConnectionFactory>(_ => new DbConnectionFactory(connectionString));
 
         services.AddDbContext<AuthContext>(builder =>
@@ -66,7 +78,7 @@ public static class AuthStartup
         {
             options.WaitForJobsToComplete = true;
         });
-
+        // #endif
         services.AddOutbox<AuthContext, OutboxMessageHandler>();
 
         services.AddMediatR(c => c.RegisterServicesFromAssembly(typeof(AuthStartup).Assembly));
@@ -74,8 +86,11 @@ public static class AuthStartup
         services.ConfigureDomainServices<AuthContext>();
 
         services.AddSingleton(publisher);
+        services.AddSingleton<SessionStorage>();
 
-        services.AddScoped<IAuthModule, AuthModule>();
+        services.AddScoped(typeof(IPipelineBehavior<,>), typeof(SaveChangesPipelineBehaviour<,>));
+
+        services.AddScoped<IAuthService, AuthService>();
     }
 
     private static async Task EventSubscriber(
@@ -107,3 +122,14 @@ public static class AuthStartup
         }
     }
 }
+
+internal static class AuthServiceCollectionExtensions
+{
+    public static void ExposeScopedService<T>(this IServiceCollection container)
+        where T : class
+    {
+        container.AddScoped<T>(services =>
+            services.GetRequiredKeyedService<ScopeBinding>("AuthServiceScope").GetService<T>()
+        );
+    }
+}

Femto.Modules.Auth/Application/Dto/LoginResult.cs

@@ -1,3 +1,3 @@
 namespace Femto.Modules.Auth.Application.Dto;
 
-public record LoginResult(Session Session, UserInfo User);
+public record LoginResult(SessionDto SessionDto, UserInfo User);

Femto.Modules.Auth/Application/Dto/RefreshUserSessionResult.cs

@@ -1,3 +1,3 @@
 namespace Femto.Modules.Auth.Application.Dto;
 
-public record RefreshUserSessionResult(Session Session, UserInfo User);
+public record RefreshUserSessionResult(SessionDto SessionDto, UserInfo User);

Femto.Modules.Auth/Application/Dto/RegisterResult.cs

@@ -1,3 +1,3 @@
 namespace Femto.Modules.Auth.Application.Dto;
 
-public record RegisterResult(Session Session, UserInfo User);
+public record RegisterResult(SessionDto SessionDto, UserInfo User);

Femto.Modules.Auth/Application/Dto/RememberMeToken.cs

@@ -0,0 +1,18 @@
+using Femto.Modules.Auth.Models;
+
+namespace Femto.Modules.Auth.Application.Dto;
+
+public record RememberMeToken(string Selector, string Verifier)
+{
+    public static RememberMeToken FromCode(string code)
+    {
+        var parts = code.Split('.');
+        return new RememberMeToken(parts[0], parts[1]);
+    }
+    
+};
+
+public record NewRememberMeToken(string Selector, string Verifier, DateTimeOffset Expires)
+{
+    public string Code => $"{Selector}.{Verifier}";
+}

Femto.Modules.Auth/Application/Dto/Session.cs

@@ -2,9 +2,16 @@ using Femto.Modules.Auth.Models;
 
 namespace Femto.Modules.Auth.Application.Dto;
 
-public record Session(string SessionId, DateTimeOffset Expires)
+public record SessionDto(
+    string SessionId,
+    DateTimeOffset Expires,
+    bool Weak,
+    string? RememberMe = null
+)
 {
-    internal Session(UserSession session) : this(session.Id, session.Expires)
-    {
-    }
-}
+    internal SessionDto(Session session)
+        : this(session.Id, session.Expires, !session.IsStronglyAuthenticated) { }
+
+    internal SessionDto(Session session, string? rememberMe)
+        : this(session.Id, session.Expires, !session.IsStronglyAuthenticated, rememberMe) { }
+}

Femto.Modules.Auth/Application/Dto/ValidateSessionResult.cs

@@ -1,3 +1,3 @@
 namespace Femto.Modules.Auth.Application.Dto;
 
-public record ValidateSessionResult(Session Session, UserInfo User);
+public record ValidateSessionResult(SessionDto SessionDto);

Femto.Modules.Auth/Application/IAuthModule.cs

@@ -1,10 +0,0 @@
-using Femto.Common.Domain;
-
-namespace Femto.Modules.Auth.Application;
-
-public interface IAuthModule
-{
-    Task Command(ICommand command, CancellationToken cancellationToken = default);
-    Task<TResponse> Command<TResponse>(ICommand<TResponse> command, CancellationToken cancellationToken = default);
-    Task<TResponse> Query<TResponse>(IQuery<TResponse> query, CancellationToken cancellationToken = default);
-}

Femto.Modules.Auth/Application/IAuthService.cs

@@ -0,0 +1,45 @@
+using Femto.Modules.Auth.Application.Dto;
+using Femto.Modules.Auth.Models;
+
+namespace Femto.Modules.Auth.Application;
+
+public interface IAuthService
+{
+    public Task<UserAndSession?> AuthenticateUserCredentials(
+        string username,
+        string password,
+        CancellationToken cancellationToken = default
+    );
+    public Task<UserInfo?> GetUserWithId(
+        Guid? userId,
+        CancellationToken cancellationToken = default
+    );
+    public Task<Session> CreateNewSession(Guid userId);
+    public Task<Session> CreateWeakSession(Guid userId);
+    public Task<Session?> GetSession(string sessionId);
+    public Task DeleteSession(string sessionId);
+
+    public Task<UserAndSession> CreateUserWithCredentials(string username,
+        string password,
+        string signupCode,
+        CancellationToken cancellationToken = default);
+
+    public Task AddSignupCode(
+        string code,
+        string recipientName,
+        CancellationToken cancellationToken = default
+    );
+
+    public Task<ICollection<SignupCodeDto>> GetSignupCodes(
+        CancellationToken cancellationToken = default
+    );
+
+    Task<NewRememberMeToken> CreateRememberMeToken(Guid userId);
+    Task<(UserInfo?, NewRememberMeToken?)> GetUserWithRememberMeToken(RememberMeToken rememberMeToken);
+    Task DeleteRememberMeToken(RememberMeToken rememberMeToken);
+
+    Task ChangePassword(Guid userId, string password, CancellationToken cancellationToken = default);
+    Task InvalidateUserSessions(Guid userId, CancellationToken cancellationToken = default);
+}
+
+public record UserAndSession(UserInfo User, Session Session);

Femto.Modules.Auth/Application/Interface/CreateSignupCode/CreateSignupCodeCommand.cs

@@ -1,5 +0,0 @@
-using Femto.Common.Domain;
-
-namespace Femto.Modules.Auth.Application.Interface.CreateSignupCode;
-
-public record CreateSignupCodeCommand(string Code, string RecipientEmail, string RecipientName): ICommand;

Femto.Modules.Auth/Application/Interface/CreateSignupCode/CreateSignupCodeCommandHandler.cs

@@ -1,15 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Data;
-using Femto.Modules.Auth.Models;
-
-namespace Femto.Modules.Auth.Application.Interface.CreateSignupCode;
-
-internal class CreateSignupCodeCommandHandler(AuthContext context) : ICommandHandler<CreateSignupCodeCommand>
-{
-    public async Task Handle(CreateSignupCodeCommand command, CancellationToken cancellationToken)
-    {
-        var code = new SignupCode(command.RecipientEmail, command.RecipientName, command.Code);
-        
-        await context.SignupCodes.AddAsync(code, cancellationToken);
-    }
-}

Femto.Modules.Auth/Application/Interface/GetSignupCodesQuery/GetSignupCodesQuery.cs

@@ -1,6 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-
-namespace Femto.Modules.Auth.Application.Interface.GetSignupCodesQuery;
-
-public record GetSignupCodesQuery: IQuery<ICollection<SignupCodeDto>>;

Femto.Modules.Auth/Application/Interface/GetSignupCodesQuery/GetSignupCodesQueryHandler.cs

@@ -1,55 +0,0 @@
-using Dapper;
-using Femto.Common.Domain;
-using Femto.Common.Infrastructure.DbConnection;
-using Femto.Modules.Auth.Application.Dto;
-
-namespace Femto.Modules.Auth.Application.Interface.GetSignupCodesQuery;
-
-public class GetSignupCodesQueryHandler(IDbConnectionFactory connectionFactory)
-    : IQueryHandler<GetSignupCodesQuery, ICollection<SignupCodeDto>>
-{
-    public async Task<ICollection<SignupCodeDto>> Handle(
-        GetSignupCodesQuery request,
-        CancellationToken cancellationToken
-    )
-    {
-        using var conn = connectionFactory.GetConnection();
-
-        // lang=sql
-        const string sql = """
-            SELECT 
-                sc.code as Code,
-                sc.recipient_email as Email,
-                sc.recipient_name as Name,
-                sc.redeeming_user_id as RedeemedByUserId,
-                u.username as RedeemedByUsername,
-                sc.expires_at as ExpiresOn
-            FROM authn.signup_code sc
-            LEFT JOIN authn.user_identity u ON u.id = sc.redeeming_user_id
-            ORDER BY sc.created_at DESC
-            """;
-
-        var result = await conn.QueryAsync<QueryResultRow>(sql);
-
-        return result
-            .Select(row => new SignupCodeDto(
-                row.Code,
-                row.Email,
-                row.Name,
-                row.RedeemedByUserId,
-                row.RedeemedByUsername,
-                row.ExpiresOn
-            ))
-            .ToList();
-    }
-
-    private class QueryResultRow
-    {
-        public string Code { get; set; }
-        public string Email { get; set; }
-        public string Name { get; set; }
-        public Guid? RedeemedByUserId { get; set; }
-        public string? RedeemedByUsername { get; set; }
-        public DateTimeOffset? ExpiresOn { get; set; }
-    }
-}

Femto.Modules.Auth/Application/Interface/Login/LoginCommand.cs

@@ -1,6 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-
-namespace Femto.Modules.Auth.Application.Interface.Login;
-
-public record LoginCommand(string Username, string Password) : ICommand<LoginResult>;

Femto.Modules.Auth/Application/Interface/Login/LoginCommandHandler.cs

@@ -1,28 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-using Femto.Modules.Auth.Data;
-using Microsoft.EntityFrameworkCore;
-
-namespace Femto.Modules.Auth.Application.Interface.Login;
-
-internal class LoginCommandHandler(AuthContext context)
-    : ICommandHandler<LoginCommand, LoginResult>
-{
-    public async Task<LoginResult> Handle(LoginCommand request, CancellationToken cancellationToken)
-    {
-        var user = await context.Users.SingleOrDefaultAsync(
-            u => u.Username == request.Username,
-            cancellationToken
-        );
-
-        if (user is null)
-            throw new DomainError("invalid credentials");
-
-        if (!user.HasPassword(request.Password))
-            throw new DomainError("invalid credentials");
-        
-        var session = user.StartNewSession();
-
-        return new(new Session(session.Id, session.Expires), new UserInfo(user));
-    }
-}

Femto.Modules.Auth/Application/Interface/RefreshUserSession/RefreshUserSessionCommand.cs

@@ -1,7 +0,0 @@
-using Femto.Common;
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-
-namespace Femto.Modules.Auth.Application.Interface.RefreshUserSession;
-
-public record RefreshUserSessionCommand(Guid ForUser, CurrentUser CurrentUser) : ICommand<RefreshUserSessionResult>;

Femto.Modules.Auth/Application/Interface/RefreshUserSession/RefreshUserSessionCommandHandler.cs

@@ -1,32 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Common.Infrastructure.DbConnection;
-using Femto.Modules.Auth.Application.Dto;
-using Femto.Modules.Auth.Data;
-using Microsoft.EntityFrameworkCore;
-
-namespace Femto.Modules.Auth.Application.Interface.RefreshUserSession;
-
-internal class RefreshUserSessionCommandHandler(AuthContext context)
-    : ICommandHandler<RefreshUserSessionCommand, RefreshUserSessionResult>
-{
-    public async Task<RefreshUserSessionResult> Handle(
-        RefreshUserSessionCommand request,
-        CancellationToken cancellationToken
-    )
-    {
-        if (request.CurrentUser.Id != request.ForUser)
-            throw new DomainError("invalid request");
-
-        var user = await context.Users.SingleOrDefaultAsync(
-            u => u.Id == request.ForUser,
-            cancellationToken
-        );
-
-        if (user is null)
-            throw new DomainError("invalid request");
-
-        var session = user.PossiblyRefreshSession(request.CurrentUser.SessionId);
-
-        return new(new Session(session), new UserInfo(user));
-    }
-}

Femto.Modules.Auth/Application/Interface/Register/RegisterCommand.cs

@@ -1,6 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-
-namespace Femto.Modules.Auth.Application.Interface.Register;
-
-public record RegisterCommand(string Username, string Password, string SignupCode) : ICommand<RegisterResult>;

Femto.Modules.Auth/Application/Interface/Register/RegisterCommandHandler.cs

@@ -1,35 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-using Femto.Modules.Auth.Data;
-using Femto.Modules.Auth.Models;
-using Microsoft.EntityFrameworkCore;
-
-namespace Femto.Modules.Auth.Application.Interface.Register;
-
-internal class RegisterCommandHandler(AuthContext context) : ICommandHandler<RegisterCommand, RegisterResult>
-{
-    public async Task<RegisterResult> Handle(RegisterCommand request, CancellationToken cancellationToken)
-    {
-        var now = DateTimeOffset.UtcNow;
-        var code = await context.SignupCodes
-            .Where(c => c.Code == request.SignupCode)
-            .Where(c => c.ExpiresAt == null || c.ExpiresAt > now)
-            .Where(c => c.RedeemingUserId == null)
-            .SingleOrDefaultAsync(cancellationToken);
-
-        if (code is null)
-            throw new DomainError("invalid signup code");
-        
-        var user = new UserIdentity(request.Username);
-        
-        user.SetPassword(request.Password);
-
-        var session = user.StartNewSession();
-        
-        await context.AddAsync(user, cancellationToken);
-        
-        code.Redeem(user.Id);
-        
-        return new(new Session(session.Id, session.Expires), new UserInfo(user));    
-    }
-}

Femto.Modules.Auth/Application/Interface/ValidateSession/ValidateSessionCommand.cs

@@ -1,10 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-
-namespace Femto.Modules.Auth.Application.Interface.ValidateSession;
-
-/// <summary>
-/// Validate an existing session, and then return either the current session, or a new one in case the expiry is further in the future
-/// </summary>
-/// <param name="SessionId"></param>
-public record ValidateSessionCommand(string SessionId) : ICommand<ValidateSessionResult>;

Femto.Modules.Auth/Application/Interface/ValidateSession/ValidateSessionCommandHandler.cs

@@ -1,34 +0,0 @@
-using Femto.Common.Domain;
-using Femto.Modules.Auth.Application.Dto;
-using Femto.Modules.Auth.Data;
-using Femto.Modules.Auth.Errors;
-using Microsoft.EntityFrameworkCore;
-
-namespace Femto.Modules.Auth.Application.Interface.ValidateSession;
-
-internal class ValidateSessionCommandHandler(AuthContext context)
-    : ICommandHandler<ValidateSessionCommand, ValidateSessionResult>
-{
-    public async Task<ValidateSessionResult> Handle(
-        ValidateSessionCommand request,
-        CancellationToken cancellationToken
-    )
-    {
-        var now = DateTimeOffset.UtcNow;
-
-        var user = await context.Users.SingleOrDefaultAsync(
-            u => u.Sessions.Any(s => s.Id == request.SessionId && s.Expires > now),
-            cancellationToken
-        );
-
-        if (user is null)
-            throw new InvalidSessionError();
-
-        var session = user.PossiblyRefreshSession(request.SessionId);
-
-        return new ValidateSessionResult(
-            new Session(session.Id, session.Expires),
-            new UserInfo(user)
-        );
-    }
-}

Femto.Modules.Auth/Data/AuthContext.cs

@@ -1,6 +1,10 @@
+using Femto.Common.Domain;
 using Femto.Common.Infrastructure.Outbox;
 using Femto.Modules.Auth.Models;
+using MediatR;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.Extensions.Logging;
 
 namespace Femto.Modules.Auth.Data;
 
@@ -8,6 +12,7 @@ internal class AuthContext(DbContextOptions<AuthContext> options) : DbContext(op
 {
     public virtual DbSet<UserIdentity> Users { get; set; }
     public virtual DbSet<SignupCode> SignupCodes { get; set; }
+    public virtual DbSet<LongTermSession> LongTermSessions { get; set; }
     public virtual DbSet<OutboxEntry> Outbox { get; set; }
 
     protected override void OnModelCreating(ModelBuilder builder)
@@ -16,4 +21,43 @@ internal class AuthContext(DbContextOptions<AuthContext> options) : DbContext(op
         builder.HasDefaultSchema("authn");
         builder.ApplyConfigurationsFromAssembly(typeof(AuthContext).Assembly);
     }
+
+    public override int SaveChanges()
+    {
+        throw new InvalidOperationException("Use SaveChangesAsync instead");
+    }
+
+    public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
+    {
+        await EmitDomainEvents(cancellationToken);
+        
+        return await base.SaveChangesAsync(cancellationToken);
+    }
+
+    private async Task EmitDomainEvents(CancellationToken cancellationToken)
+    {
+        var logger = this.GetService<ILogger<AuthContext>>();
+        var publisher = this.GetService<IPublisher>();
+        var domainEvents = this
+            .ChangeTracker.Entries<Entity>()
+            .SelectMany(e =>
+            {
+                var events = e.Entity.DomainEvents;
+                e.Entity.ClearDomainEvents();
+                return events;
+            })
+            .ToList();
+
+        logger.LogTrace("loaded {Count} domain events", domainEvents.Count);
+
+        foreach (var domainEvent in domainEvents)
+        {
+            logger.LogTrace(
+                "publishing {Type} domain event {Id}",
+                domainEvent.GetType().Name,
+                domainEvent.EventId
+            );
+            await publisher.Publish(domainEvent, cancellationToken);
+        }
+    }
 }

Femto.Modules.Auth/Data/Configurations/LongTermSessionConfiguration.cs

@@ -0,0 +1,13 @@
+using Femto.Modules.Auth.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Femto.Modules.Auth.Data.Configurations;
+
+public class LongTermSessionConfiguration : IEntityTypeConfiguration<LongTermSession>
+{
+    public void Configure(EntityTypeBuilder<LongTermSession> builder)
+    {
+        builder.ToTable("long_term_session");
+    }
+}

Femto.Modules.Auth/Data/Configurations/UserIdentityTypeConfiguration.cs

@@ -19,8 +19,6 @@ internal class UserIdentityTypeConfiguration : IEntityTypeConfiguration<UserIden
             }
         );
 
-        builder.OwnsMany(u => u.Sessions).WithOwner().HasForeignKey("user_id");
-
         builder
             .OwnsMany(u => u.Roles, entity =>
             {

Femto.Modules.Auth/Infrastructure/SaveChangesPipelineBehaviour.cs

@@ -0,0 +1,23 @@
+using Femto.Modules.Auth.Data;
+using MediatR;
+
+namespace Femto.Modules.Auth.Infrastructure;
+
+internal class SaveChangesPipelineBehaviour<TRequest, TResponse>(AuthContext context)
+    : IPipelineBehavior<TRequest, TResponse>
+    where TRequest : notnull
+{
+    public async Task<TResponse> Handle(
+        TRequest request,
+        RequestHandlerDelegate<TResponse> next,
+        CancellationToken cancellationToken
+    )
+    {
+        var response = await next(cancellationToken);
+
+        if (context.ChangeTracker.HasChanges())
+            await context.SaveChangesAsync(cancellationToken);
+
+        return response;
+    }
+}

Femto.Modules.Auth/Infrastructure/SessionStorage.cs

@@ -0,0 +1,56 @@
+using System.Collections;
+using System.Collections.Concurrent;
+using Femto.Modules.Auth.Models;
+using Microsoft.Extensions.Caching.Memory;
+
+namespace Femto.Modules.Auth.Infrastructure;
+
+internal class SessionStorage(TimeProvider timeProvider)
+{
+    private readonly IMemoryCache _storage = new MemoryCache(new MemoryCacheOptions());
+
+    public async Task<Session?> GetSession(string id)
+    {
+        var session = this._storage.Get<Session>($"session:{id}");
+
+        if (session is null)
+            return null;
+
+        var invalidUntil = this._storage.Get<DateTimeOffset?>(
+            $"user:invalid_until:{session.UserId}"
+        );
+
+        if (invalidUntil is not null && invalidUntil > session.Expires)
+            return null;
+
+        return session;
+    }
+
+    public Task AddSession(Session session)
+    {
+        using var sessionEntry = this._storage.CreateEntry($"session:{session.Id}");
+        sessionEntry.Value = session;
+        sessionEntry.SetAbsoluteExpiration(session.Expires);
+
+        return Task.CompletedTask;
+    }
+
+    public Task DeleteSession(string id)
+    {
+        this._storage.Remove($"session:{id}");
+
+        return Task.CompletedTask;
+    }
+
+    public Task InvalidateUserSessions(Guid userId)
+    {
+        var invalidUntil = timeProvider.GetUtcNow() + Session.ValidityPeriod;
+
+        // invalidate sessions who are currently valid
+        // any sessions created after this will have a validity period that extends past invalid_until
+        // this cache entry doesn't need to live longer than that point in time
+        this._storage.Set($"user:invalid_until:{userId}", invalidUntil, invalidUntil);
+
+        return Task.CompletedTask;
+    }
+}

Femto.Modules.Auth/Models/DomainEventHandlers/UserPasswordChangedHandler.cs

@@ -0,0 +1,22 @@
+using Femto.Modules.Auth.Data;
+using Femto.Modules.Auth.Models.Events;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Femto.Modules.Auth.Models.DomainEventHandlers;
+
+internal class UserPasswordChangedHandler(AuthContext context)
+    : INotificationHandler<UserWasCreatedEvent>
+{
+    public async Task Handle(UserWasCreatedEvent notification, CancellationToken cancellationToken)
+    {
+        var longTermSessions = await context
+            .LongTermSessions.Where(s => s.UserId == notification.User.Id)
+            .ToListAsync(cancellationToken);
+        
+        foreach (var session in longTermSessions)
+        {
+            session.Invalidate();
+        }
+    }
+}

Femto.Modules.Auth/Models/Events/UserPasswordChangedDomainEvent.cs

@@ -0,0 +1,5 @@
+using Femto.Common.Domain;
+
+namespace Femto.Modules.Auth.Models.Events;
+
+internal record UserPasswordChangedDomainEvent(UserIdentity User) : DomainEvent;

Femto.Modules.Auth/Models/LongTermSession.cs

@@ -0,0 +1,73 @@
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text;
+using static System.Security.Cryptography.RandomNumberGenerator;
+
+namespace Femto.Modules.Auth.Models;
+
+public class LongTermSession
+{
+    private static TimeSpan TokenTimeout { get; } = TimeSpan.FromDays(90);
+    private static TimeSpan RefreshBuffer { get; } = TimeSpan.FromDays(5);
+
+    public int Id { get; private set; }
+
+    public string Selector { get; private set; }
+
+    public byte[] HashedVerifier { get; private set; }
+
+    public DateTimeOffset Expires { get; private set; }
+
+    public Guid UserId { get; private set; }
+    
+    public bool IsInvalidated { get; private set; }
+
+    [NotMapped]
+    public bool ExpiresSoon => this.Expires < DateTimeOffset.UtcNow + RefreshBuffer;
+
+    private LongTermSession() { }
+
+    public static (LongTermSession, string) Create(Guid userId)
+    {
+        var selector = GetString(
+            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",
+            12
+        );
+     
+        var verifier = GetString("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", 32);
+
+        using var sha256 = System.Security.Cryptography.SHA256.Create();
+
+        var longTermSession = new LongTermSession
+        {
+            Selector = selector,
+            HashedVerifier = ComputeHash(verifier),
+            UserId = userId,
+            Expires = DateTimeOffset.UtcNow + TokenTimeout,
+        };
+
+        return (longTermSession, verifier);
+    }
+
+    public bool CheckVerifier(string verifier)
+    {
+        if (this.IsInvalidated)
+            return false;
+        
+        if (this.Expires < DateTimeOffset.UtcNow)
+            return false;
+
+        return ComputeHash(verifier).SequenceEqual(this.HashedVerifier);
+    }
+
+    private static byte[] ComputeHash(string verifier)
+    {
+        using var sha256 = System.Security.Cryptography.SHA256.Create();
+        var hashedVerifier = sha256.ComputeHash(Encoding.UTF8.GetBytes(verifier));
+        return hashedVerifier;
+    }
+    
+    public void Invalidate()
+    {
+        this.IsInvalidated = true;
+    }
+}

Femto.Modules.Auth/Models/Session.cs

@@ -0,0 +1,16 @@
+using static System.Security.Cryptography.RandomNumberGenerator;
+
+namespace Femto.Modules.Auth.Models;
+
+public class Session(Guid userId, bool isStrong)
+{
+    public static readonly  TimeSpan ValidityPeriod = TimeSpan.FromMinutes(15);
+    private static readonly TimeSpan RefreshBuffer = TimeSpan.FromMinutes(5);
+    public string Id { get; } = Convert.ToBase64String(GetBytes(32));
+    public Guid UserId { get; } = userId;
+    public DateTimeOffset Expires { get; } = DateTimeOffset.UtcNow + ValidityPeriod;
+    
+    public bool ExpiresSoon => this.Expires < DateTimeOffset.UtcNow + RefreshBuffer;
+    public bool IsStronglyAuthenticated { get; } = isStrong;
+    public bool IsExpired  => this.Expires < DateTimeOffset.UtcNow;
+}

Femto.Modules.Auth/Models/UserIdentity.cs

@@ -1,9 +1,6 @@
-using System.Text;
-using System.Text.Unicode;
 using Femto.Common.Domain;
 using Femto.Modules.Auth.Contracts;
 using Femto.Modules.Auth.Models.Events;
-using Geralt;
 
 namespace Femto.Modules.Auth.Models;
 
@@ -15,8 +12,6 @@ internal class UserIdentity : Entity
 
     public Password? Password { get; private set; }
 
-    public ICollection<UserSession> Sessions { get; private set; } = [];
-
     public ICollection<UserRole> Roles { get; private set; } = [];
 
     private UserIdentity() { }
@@ -31,14 +26,10 @@ internal class UserIdentity : Entity
         this.AddDomainEvent(new UserWasCreatedEvent(this));
     }
 
-    public UserIdentity WithPassword(string password)
-    {
-        this.SetPassword(password);
-        return this;
-    }
-
     public void SetPassword(string password)
     {
+        if (this.Password is not null)
+            this.AddDomainEvent(new UserPasswordChangedDomainEvent(this));
         this.Password = new Password(password);
     }
 
@@ -51,25 +42,6 @@ internal class UserIdentity : Entity
 
         return this.Password.Check(requestPassword);
     }
-
-    public UserSession PossiblyRefreshSession(string sessionId)
-    {
-        var session = this.Sessions.Single(s => s.Id == sessionId);
-
-        if (session.ExpiresSoon)
-            return this.StartNewSession();
-
-        return session;
-    }
-
-    public UserSession StartNewSession()
-    {
-        var session = UserSession.Create();
-
-        this.Sessions.Add(session);
-
-        return session;
-    }
 }
 
 public class SetPasswordError(string message, Exception inner) : DomainError(message, inner);

Femto.Modules.Auth/Models/UserSession.cs

@@ -1,21 +0,0 @@
-namespace Femto.Modules.Auth.Models;
-
-internal class UserSession
-{
-    private static TimeSpan SessionTimeout { get; } = TimeSpan.FromMinutes(30);
-    private static TimeSpan ExpiryBuffer { get; } = TimeSpan.FromMinutes(5);
-    public string Id { get; private set; }
-    public DateTimeOffset Expires { get; private set; }
-    public bool ExpiresSoon => Expires < DateTimeOffset.UtcNow + ExpiryBuffer;
-    
-    private UserSession() {}
-
-    public static UserSession Create()
-    {
-        return new()
-        {
-            Id = Convert.ToBase64String(System.Security.Cryptography.RandomNumberGenerator.GetBytes(32)),
-            Expires = DateTimeOffset.UtcNow + SessionTimeout
-        };
-    }
-}

Femto.Modules.Blog.Data/Class1.cs

@@ -1,5 +0,0 @@
-namespace Femto.Modules.Blog.Data;
-
-public class Class1
-{
-}

Femto.Modules.Blog.Data/Femto.Modules.Blog.Data.csproj

@@ -1,9 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-    <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
-        <ImplicitUsings>enable</ImplicitUsings>
-        <Nullable>enable</Nullable>
-    </PropertyGroup>
-
-</Project>

Femto.Modules.Blog.Domain/Femto.Modules.Blog.Domain.csproj

@@ -1,24 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-    <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
-        <ImplicitUsings>enable</ImplicitUsings>
-        <Nullable>enable</Nullable>
-    </PropertyGroup>
-
-    <ItemGroup>
-      <PackageReference Include="MediatR" Version="12.5.0" />
-    </ItemGroup>
-
-    <ItemGroup>
-      <ProjectReference Include="..\Femto.Common\Femto.Common.csproj" />
-      <ProjectReference Include="..\Femto.Modules.Blog.Contracts\Femto.Modules.Blog.Contracts.csproj" />
-    </ItemGroup>
-
-    <ItemGroup>
-      <Reference Include="Microsoft.EntityFrameworkCore">
-        <HintPath>..\..\..\..\.nuget\packages\microsoft.entityframeworkcore\9.0.4\lib\net8.0\Microsoft.EntityFrameworkCore.dll</HintPath>
-      </Reference>
-    </ItemGroup>
-
-</Project>

Femto.Modules.Blog/Application/BlogStartup.cs

@@ -35,9 +35,13 @@ public static class BlogStartup
 
         rootContainer.AddHostedService(_ => new BlogApplication(host));
 
-        rootContainer.AddScoped(_ => new ScopeBinding<IBlogModule>(host.Services.CreateScope()));
+        rootContainer.AddKeyedScoped<ScopeBinding>(
+            "BlogService",
+            (_, o) => new ScopeBinding(host.Services.CreateScope())
+        );
+        
         rootContainer.AddScoped(services =>
-            services.GetRequiredService<ScopeBinding<IBlogModule>>().GetService()
+            services.GetRequiredKeyedService<ScopeBinding>("BlogService").GetService<IBlogModule>()
         );
 
         bus.Subscribe(

Femto.Modules.Blog/Application/Commands/AddPostComment/AddPostCommentCommand.cs

@@ -0,0 +1,5 @@
+using Femto.Common.Domain;
+
+namespace Femto.Modules.Blog.Application.Commands.AddPostComment;
+
+public record AddPostCommentCommand(Guid PostId, Guid AuthorId, string Content) : ICommand;

Femto.Modules.Blog/Application/Commands/AddPostComment/AddPostCommentCommandHandler.cs

@@ -0,0 +1,20 @@
+using Femto.Common.Domain;
+using Microsoft.EntityFrameworkCore;
+
+namespace Femto.Modules.Blog.Application.Commands.AddPostComment;
+
+internal class AddPostCommentCommandHandler(BlogContext context) : ICommandHandler<AddPostCommentCommand>
+{
+    public async Task Handle(AddPostCommentCommand request, CancellationToken cancellationToken)
+    {
+        var post = await context.Posts.SingleOrDefaultAsync(
+            p => p.Id == request.PostId,
+            cancellationToken
+        );
+
+        if (post is null)
+            return;
+
+        post.AddComment(request.AuthorId, request.Content);
+    }
+}

Femto.Modules.Blog/Application/Commands/AddPostReaction/AddPostReactionCommand.cs

@@ -0,0 +1,6 @@
+using Femto.Common;
+using Femto.Common.Domain;
+
+namespace Femto.Modules.Blog.Application.Commands.AddPostReaction;
+
+public record AddPostReactionCommand(Guid PostId, string Emoji, Guid ReactorId) : ICommand;

Femto.Modules.Blog/Application/Commands/AddPostReaction/AddPostReactionCommandHandler.cs

@@ -0,0 +1,21 @@
+using Femto.Common.Domain;
+using Microsoft.EntityFrameworkCore;
+
+namespace Femto.Modules.Blog.Application.Commands.AddPostReaction;
+
+internal class AddPostReactionCommandHandler(BlogContext context)
+    : ICommandHandler<AddPostReactionCommand>
+{
+    public async Task Handle(AddPostReactionCommand request, CancellationToken cancellationToken)
+    {
+        var post = await context.Posts.SingleOrDefaultAsync(
+            p => p.Id == request.PostId,
+            cancellationToken
+        );
+
+        if (post is null)
+            return;
+
+        post.AddReaction(request.ReactorId, request.Emoji);
+    }
+}

Femto.Modules.Blog/Application/Commands/ClearPostReaction/ClearPostReactionCommand.cs

@@ -0,0 +1,6 @@
+using Femto.Common;
+using Femto.Common.Domain;
+
+namespace Femto.Modules.Blog.Application.Commands.ClearPostReaction;
+
+public record ClearPostReactionCommand(Guid PostId, string Emoji, Guid ReactorId): ICommand;

Femto.Modules.Blog/Application/Commands/ClearPostReaction/ClearPostReactionCommandHandler.cs

@@ -0,0 +1,22 @@
+using Femto.Common.Domain;
+using Femto.Modules.Blog.Application.Commands.AddPostReaction;
+using Microsoft.EntityFrameworkCore;
+
+namespace Femto.Modules.Blog.Application.Commands.ClearPostReaction;
+
+internal class ClearPostReactionCommandHandler(BlogContext context)
+    : ICommandHandler<ClearPostReactionCommand>
+{
+    public async Task Handle(ClearPostReactionCommand request, CancellationToken cancellationToken)
+    {
+        var post = await context.Posts.SingleOrDefaultAsync(
+            p => p.Id == request.PostId,
+            cancellationToken
+        );
+
+        if (post is null)
+            return;
+
+        post.RemoveReaction(request.ReactorId, request.Emoji);
+    }
+}

Femto.Modules.Blog/Application/Commands/CreatePost/CreatePostCommand.cs

@@ -1,8 +1,22 @@
+using Femto.Common;
 using Femto.Common.Domain;
+using Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
 
 namespace Femto.Modules.Blog.Application.Commands.CreatePost;
 
-public record CreatePostCommand(Guid AuthorId, string Content, IEnumerable<CreatePostMedia> Media, bool? IsPublic)
-    : ICommand<Guid>;
+public record CreatePostCommand(
+    Guid AuthorId,
+    string Content,
+    IEnumerable<CreatePostMedia> Media,
+    bool? IsPublic,
+    CurrentUser CurrentUser
+) : ICommand<PostDto>;
 
-public record CreatePostMedia(Guid MediaId, Uri Url, string? Type, int Order, int? Width, int? Height);
+public record CreatePostMedia(
+    Guid MediaId,
+    Uri Url,
+    string? Type,
+    int Order,
+    int? Width,
+    int? Height
+);

Femto.Modules.Blog/Application/Commands/CreatePost/CreatePostCommandHandler.cs

@@ -1,12 +1,16 @@
+using Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
 using Femto.Modules.Blog.Domain.Posts;
 using MediatR;
 
 namespace Femto.Modules.Blog.Application.Commands.CreatePost;
 
 internal class CreatePostCommandHandler(BlogContext context)
-    : IRequestHandler<CreatePostCommand, Guid>
+    : IRequestHandler<CreatePostCommand, PostDto>
 {
-    public async Task<Guid> Handle(CreatePostCommand request, CancellationToken cancellationToken)
+    public async Task<PostDto> Handle(
+        CreatePostCommand request,
+        CancellationToken cancellationToken
+    )
     {
         var post = new Post(
             request.AuthorId,
@@ -20,13 +24,21 @@ internal class CreatePostCommandHandler(BlogContext context)
                     media.Width,
                     media.Height
                 ))
-                .ToList()
+                .ToList(),
+            request.IsPublic is true
         );
-        
-        post.IsPublic = request.IsPublic is true;
 
         await context.AddAsync(post, cancellationToken);
 
-        return post.Id;
+        return new PostDto(
+            post.Id,
+            post.Content,
+            post.Media.Select(m => new PostMediaDto(m.Url, m.Width, m.Height)).ToList(),
+            post.PostedOn,
+            new PostAuthorDto(post.AuthorId, request.CurrentUser.Username),
+            [],
+            post.PossibleReactions,
+            []
+        );
     }
 }

Femto.Modules.Blog/Application/Configurations/PostConfiguration.cs

@@ -10,5 +10,24 @@ internal class PostConfiguration : IEntityTypeConfiguration<Post>
     {
         table.ToTable("post");
         table.OwnsMany(post => post.Media).WithOwner();
+        table.OwnsMany(
+            post => post.Reactions,
+            reactions =>
+            {
+                reactions.WithOwner().HasForeignKey(r => r.PostId);
+                reactions.HasKey(r => new
+                {
+                    r.PostId,
+                    r.AuthorId,
+                    r.Emoji,
+                });
+            }
+        );
+
+        table.OwnsMany(p => p.Comments).WithOwner();
+
+        table.Property<string>("PossibleReactionsJson").HasColumnName("possible_reactions");
+
+        table.Ignore(e => e.PossibleReactions);
     }
 }

Femto.Modules.Blog/Application/Queries/GetPosts/Dto/GetPostsQueryResult.cs

@@ -1,3 +1,3 @@
 namespace Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
 
-public record GetPostsQueryResult(IList<PostDto> Posts, Guid? Next);
+public record GetPostsQueryResult(IList<PostDto> Posts);

Femto.Modules.Blog/Application/Queries/GetPosts/Dto/PostCommentDto.cs

@@ -0,0 +1,3 @@
+namespace Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
+
+public record PostCommentDto(string Author, string Content, DateTimeOffset PostedOn);

Femto.Modules.Blog/Application/Queries/GetPosts/Dto/PostDto.cs

@@ -1,3 +1,12 @@
 namespace Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
 
-public record PostDto(Guid PostId, string Text, IList<PostMediaDto> Media, DateTimeOffset CreatedAt, PostAuthorDto Author);
+public record PostDto(
+    Guid PostId,
+    string Text,
+    IList<PostMediaDto> Media,
+    DateTimeOffset CreatedAt,
+    PostAuthorDto Author,
+    IList<PostReactionDto> Reactions,
+    IEnumerable<string> PossibleReactions,
+    IList<PostCommentDto> Comments
+);

Femto.Modules.Blog/Application/Queries/GetPosts/Dto/PostReactionDto.cs

@@ -0,0 +1,3 @@
+namespace Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
+
+public record PostReactionDto(string Emoji, string AuthorName, DateTimeOffset ReactedOn);

Femto.Modules.Blog/Application/Queries/GetPosts/GetPostsQuery.cs

@@ -3,22 +3,27 @@ using Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
 
 namespace Femto.Modules.Blog.Application.Queries.GetPosts;
 
+/// <summary>
+/// Get posts in reverse chronological order
+/// </summary>
+/// <param name="CurrentUserId"></param>
 public record GetPostsQuery(Guid? CurrentUserId) : IQuery<GetPostsQueryResult>
 {
-    public Guid? From { get; init; }
+    /// <summary>
+    /// Id of the specific post to load. If specified, After and Amount are ignored
+    /// </summary>
+    public Guid? PostId { get; }
+    
+    /// <summary>
+    /// If specified, loads posts from after the given Id. Used for paging
+    /// </summary>
+    public Guid? After { get; init; }
     public int Amount { get; init; } = 20;
     public Guid? AuthorId { get; init; }
     public string? Author { get; init; }
 
-    /// <summary>
-    /// Default is to load in reverse chronological order
-    /// TODO this is not exposed on the client as it probably wouldn't work that well
-    /// </summary>
-    public GetPostsDirection Direction { get; init; } = GetPostsDirection.Backward;
-}
-
-public enum GetPostsDirection
-{
-    Forward,
-    Backward,
-}
+    public GetPostsQuery(Guid postId, Guid? currentUserId) : this(currentUserId)
+    {
+        this.PostId = postId;
+    }
+}

Femto.Modules.Blog/Application/Queries/GetPosts/GetPostsQueryHandler.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using Dapper;
 using Femto.Common.Infrastructure.DbConnection;
 using Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
@@ -15,101 +16,158 @@ public class GetPostsQueryHandler(IDbConnectionFactory connectionFactory)
     {
         using var conn = connectionFactory.GetConnection();
 
-        var orderBy = query.Direction is GetPostsDirection.Backward ? "desc" : "asc";
-        var pageFilter = query.Direction is GetPostsDirection.Backward ? "<=" : ">=";
         var username = query.Author;
         var authorGuid = query.AuthorId;
-        var cursor = query.From;
+        var cursor = query.After;
         var showPrivate = query.CurrentUserId is not null;
 
-        // lang=sql
-        var sql = $$"""
-            with page as (
-                select blog.post.*, blog.author.username as Username, blog.author.id as AuthorId
-                from blog.post
-                inner join blog.author on blog.author.id = blog.post.author_id
-                where (@username is null or blog.author.username = @username)
-                and (@showPrivate or blog.post.is_public = true)
-                and (@authorGuid is null or blog.author.id = @authorGuid)
-                and (@cursor is null or blog.post.id {{pageFilter}} @cursor)
-                order by blog.post.id {{orderBy}}
-                limit @amount
-            )
-            select
-                page.id as PostId,
-                page.content as Content,
-                blog.post_media.url as MediaUrl,
-                blog.post_media.width as MediaWidth,
-                blog.post_media.height as MediaHeight,
-                page.posted_on as PostedOn,
-                page.Username,
-                page.AuthorId
-                from page
-            left join blog.post_media on blog.post_media.post_id = page.id
-            order by page.id {{orderBy}}
-            """;
-
-        var result = await conn.QueryAsync<QueryResult>(
-            sql,
+        var loadPostsResult = await conn.QueryAsync<LoadPostRow>(
+            """
+            select 
+                blog.post.id as PostId,
+                blog.post.content as Content,
+                blog.post.posted_on as PostedOn,
+                blog.author.username as Username,
+                blog.author.id as AuthorId,
+                blog.post.possible_reactions as PossibleReactions
+            from blog.post
+            inner join blog.author on blog.author.id = blog.post.author_id
+            where (@username is null or blog.author.username = @username)
+            and (@postId is null or blog.post.id = @postId)
+            and (@showPrivate or blog.post.is_public = true)
+            and (@authorGuid is null or blog.author.id = @authorGuid)
+            and (@cursor is null or blog.post.id < @cursor)
+            order by blog.post.id desc
+            limit @amount
+            """,
             new
             {
                 username,
                 authorGuid,
                 cursor,
-                // load an extra one to take for the cursor
-                amount = query.Amount + 1,
+                amount = query.PostId is not null ? 1 : query.Amount,
                 showPrivate,
+                postId = query.PostId,
             }
         );
 
-        var rows = result.ToList();
+        var posts = loadPostsResult.ToList();
 
-        var posts = rows.GroupBy(row => row.PostId)
-            .Select(group =>
-            {
-                var postId = group.Key;
-                var post = group.First();
-                var media = group
-                    .Select(row =>
-                    {
-                        if (row.MediaUrl is not null)
-                        {
-                            return new PostMediaDto(
-                                new Uri(row.MediaUrl),
-                                row.MediaHeight,
-                                row.MediaHeight
-                            );
-                        }
-                        else
-                            return null;
-                    })
-                    .OfType<PostMediaDto>()
-                    .ToList();
-                return new PostDto(
-                    postId,
-                    post.Content,
-                    media,
-                    post.PostedOn,
-                    new PostAuthorDto(post.AuthorId, post.Username)
-                );
-            })
-            .ToList();
+        var postIds = posts.Select(p => p.PostId).ToList();
 
-        var next = rows.Count >= query.Amount ? rows.LastOrDefault()?.PostId : null;
+        var loadMediaResult = await conn.QueryAsync<LoadMediaRow>(
+            """
+            select 
+                pm.url as MediaUrl,
+                pm.type as MediaType,
+                pm.width as MediaWidth,
+                pm.height as MediaHeight,
+                pm.post_id as PostId
+            from blog.post_media pm where pm.post_id = ANY (@postIds)
+            order by pm.ordering
+            """,
+            new { postIds }
+        );
 
-        return new GetPostsQueryResult(posts, next);
+        var media = loadMediaResult.ToList();
+
+        var loadReactionsResult = await conn.QueryAsync<LoadReactionRow>(
+            """
+            select 
+                pr.post_id as PostId,
+                a.username as AuthorName,
+                pr.emoji as Emoji,
+                pr.created_at as CreatedOn
+            from blog.post_reaction pr
+            join blog.author a on a.id = pr.author_id
+            where pr.post_id = ANY (@postIds)
+            """,
+            new { postIds }
+        );
+
+        var reactions = loadReactionsResult.ToList();
+
+        var loadCommentsResult = await conn.QueryAsync<LoadCommentRow>(
+            """
+            select 
+                pc.id as CommentId,
+                pc.post_id as PostId,
+                pc.content as Content,
+                pc.created_at as PostedOn,
+                a.username as AuthorName
+            from blog.post_comment pc
+            join blog.author a on pc.author_id = a.id
+            where pc.post_id = ANY (@postIds)
+            """,
+            new { postIds }
+        );
+
+        var comments = loadCommentsResult.ToList();
+
+        return new GetPostsQueryResult(
+            posts
+                .Select(p => new PostDto(
+                    p.PostId,
+                    p.Content,
+                    media
+                        .Where(m => m.PostId == p.PostId)
+                        .Select(m => new PostMediaDto(
+                            new Uri(m.MediaUrl),
+                            m.MediaWidth,
+                            m.MediaHeight
+                        ))
+                        .ToList(),
+                    p.PostedOn,
+                    new PostAuthorDto(p.AuthorId, p.Username),
+                    reactions
+                        .Where(r => r.PostId == p.PostId)
+                        .Select(r => new PostReactionDto(r.Emoji, r.AuthorName, r.CreatedAt))
+                        .ToList(),
+                    !string.IsNullOrEmpty(p.PossibleReactions)
+                        ? JsonSerializer.Deserialize<IEnumerable<string>>(p.PossibleReactions)!
+                        : [],
+                    comments
+                        .Where(c => c.PostId == p.PostId)
+                        .Select(c => new PostCommentDto(c.AuthorName, c.Content, c.PostedOn))
+                        .ToList()
+                ))
+                .ToList()
+        );
     }
 
-    internal class QueryResult
+    internal record LoadPostRow
     {
-        public Guid PostId { get; set; }
-        public string Content { get; set; }
-        public string? MediaUrl { get; set; }
-        public string? MediaType { get; set; }
-        public int? MediaWidth { get; set; }
-        public int? MediaHeight { get; set; }
-        public DateTimeOffset PostedOn { get; set; }
-        public Guid AuthorId { get; set; }
-        public string Username { get; set; }
+        public Guid PostId { get; init; }
+        public string Content { get; init; }
+        public DateTimeOffset PostedOn { get; init; }
+        public string Username { get; init; }
+        public Guid AuthorId { get; init; }
+        public string? PossibleReactions { get; init; }
+    }
+
+    internal record LoadMediaRow
+    {
+        public string MediaUrl { get; init; }
+        public string? MediaType { get; init; }
+        public int? MediaWidth { get; init; }
+        public int? MediaHeight { get; init; }
+        public Guid PostId { get; init; }
+    }
+
+    internal record LoadReactionRow
+    {
+        public Guid PostId { get; init; }
+        public string AuthorName { get; init; }
+        public string Emoji { get; init; }
+        public DateTimeOffset CreatedAt { get; init; }
+    }
+
+    internal record LoadCommentRow
+    {
+        public Guid CommentId { get; init; }
+        public Guid PostId { get; init; }
+        public string Content { get; init; }
+        public DateTimeOffset PostedOn { get; init; }
+        public string AuthorName { get; init; }
     }
 }

Femto.Modules.Blog/Domain/Posts/Post.cs

@@ -1,5 +1,7 @@
+using System.Text.Json;
 using Femto.Common.Domain;
 using Femto.Modules.Blog.Domain.Posts.Events;
+using Femto.Modules.Blog.Emoji;
 
 namespace Femto.Modules.Blog.Domain.Posts;
 
@@ -9,17 +11,62 @@ internal class Post : Entity
     public Guid AuthorId { get; private set; }
     public string Content { get; private set; } = null!;
     public IList<PostMedia> Media { get; private set; }
-    public bool IsPublic { get; set; }
+
+    public IList<PostReaction> Reactions { get; private set; } = [];
+    
+    public IList<PostComment> Comments { get; private set; } = [];
+    public bool IsPublic { get; private set; }
+
+    public DateTimeOffset PostedOn { get; private set; }
+
+    private string PossibleReactionsJson { get; set; } = null!;
+
+    public IEnumerable<string> PossibleReactions
+    {
+        get => JsonSerializer.Deserialize<IEnumerable<string>>(this.PossibleReactionsJson)!;
+        init => PossibleReactionsJson = JsonSerializer.Serialize(value);
+    }
 
     private Post() { }
 
-    public Post(Guid authorId, string content, IList<PostMedia> media)
+    public Post(Guid authorId, string content, IList<PostMedia> media, bool isPublic)
     {
         this.Id = Guid.CreateVersion7();
         this.AuthorId = authorId;
         this.Content = content;
         this.Media = media;
+        this.PossibleReactions = AllEmoji.GetRandomEmoji(5);
+        this.PostedOn = DateTimeOffset.UtcNow;
+        this.IsPublic = isPublic;
 
         this.AddDomainEvent(new PostCreated(this));
     }
+
+    public void AddReaction(Guid reactorId, string emoji)
+    {
+        if (!this.PossibleReactions.Contains(emoji))
+            return;
+
+        if (this.Reactions.Any(r => r.AuthorId == reactorId && r.Emoji == emoji))
+            return;
+
+        this.Reactions.Add(new PostReaction(reactorId, this.Id, emoji));
+    }
+
+    public void RemoveReaction(Guid reactorId, string emoji)
+    {
+        this.Reactions = this
+            .Reactions.Where(r => r.AuthorId != reactorId || r.Emoji != emoji)
+            .ToList();
+    }
+    
+    public void AddComment(Guid authorId, string content)
+    {
+        // XXX just ignore empty comments for now. we may want to upgrade this to an error
+        //     but it is probably suitable to just consider it a no-op
+        if (string.IsNullOrWhiteSpace(content))
+            return;
+        
+        this.Comments.Add(new PostComment(authorId, content));
+    }
 }

Femto.Modules.Blog/Domain/Posts/PostComment.cs

@@ -0,0 +1,19 @@
+namespace Femto.Modules.Blog.Domain.Posts;
+
+internal class PostComment
+{
+    public Guid Id { get; private set; }
+    public Guid AuthorId { get; private set; }
+    public DateTimeOffset CreatedAt { get; private set; }
+    public string Content { get; private set; }
+    
+    private PostComment() {}
+
+    public PostComment(Guid authorId, string content)
+    {
+        this.Id = Guid.CreateVersion7();
+        this.AuthorId = authorId;
+        this.Content = content;
+        this.CreatedAt = TimeProvider.System.GetUtcNow();
+    }
+}

Femto.Modules.Blog/Domain/Posts/PostReaction.cs

@@ -0,0 +1,18 @@
+namespace Femto.Modules.Blog.Domain.Posts;
+
+public class PostReaction
+{
+    public Guid AuthorId { get; private set; }
+    public Guid PostId { get; private set; }
+    public string Emoji { get; private set; } = null!;
+    public DateTimeOffset CreatedAt { get; private set; }
+    public PostReaction(Guid authorId, Guid postId, string emoji)
+    {
+        this.AuthorId = authorId;
+        this.PostId = postId;
+        this.Emoji = emoji;
+        this.CreatedAt = TimeProvider.System.GetUtcNow();
+    }
+    
+    private PostReaction() { }
+}

Femto.Modules.Blog/Emoji/GetRandomEmoji.cs

@@ -0,0 +1,18 @@
+namespace Femto.Modules.Blog.Emoji;
+
+internal static partial class AllEmoji
+{
+    public static IList<string> GetRandomEmoji(int count) => new Random().TakeRandomly(Emojis).Distinct().Take(count).ToList();
+}
+
+internal static class RandomExtensions
+{
+    public static IEnumerable<T> TakeRandomly<T>(this Random rand, ICollection<T> collection)
+    {
+        while (true)
+        {
+            var idx = rand.Next(collection.Count);
+            yield return collection.ElementAt(idx);
+        }
+    }
+}

Femto.Modules.Files/Domain/Files/File.cs

@@ -1,8 +0,0 @@
-namespace Femto.Modules.Files.Domain.Files;
-
-public class File
-{
-    Guid Id { get; set; }
-    
-     
-}

Femto.Modules.Files/Femto.Modules.Files.csproj

@@ -1,9 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-    <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
-        <ImplicitUsings>enable</ImplicitUsings>
-        <Nullable>enable</Nullable>
-    </PropertyGroup>
-
-</Project>

scripts/generate-emojis.js

@@ -0,0 +1,38 @@
+try {
+    console.error('Downloading emoji-test.txt...');
+    const response = await fetch('https://unicode.org/Public/emoji/latest/emoji-test.txt');
+    const text = await response.text();
+    const emojis = extractEmojis(text);
+    console.error(`Extracted ${emojis.length} fully-qualified emojis.`);
+    console.log(`
+    namespace Femto.Modules.Blog.Emoji;
+    
+    internal static partial class AllEmoji
+    {
+        public static readonly string[] Emojis = [\n${emojis.map(e => `"${e}"`).join(',\n')}\n];
+    }
+    `)
+} catch (err) {
+    console.error('Error:', err);
+}
+
+
+function extractEmojis(text) {
+    const lines = text.split('\n');
+    const emojis = [];
+
+    for (const line of lines) {
+        if (line.startsWith('#') || line.trim() === '') continue;
+
+        const [codePart, descPart] = line.split(';');
+        if (!descPart || !descPart.includes('fully-qualified')) continue;
+
+        const match = line.match(/#\s+(.+?)\s+E\d+\.\d+/);
+        if (match) {
+            emojis.push(match[1]);
+        }
+    }
+
+    return emojis;
+}
+