✨ Post reactions

DysonNetwork.Sphere/AppDatabase.cs

@@ -80,6 +80,7 @@ public class AppDatabase(
                     Nodes =
                     {
                         PermissionService.NewPermissionNode("group:default", "global", "posts.create", true),
+                        PermissionService.NewPermissionNode("group:default", "global", "posts.reactions.create", true),
                         PermissionService.NewPermissionNode("group:default", "global", "publishers.create", true),
                         PermissionService.NewPermissionNode("group:default", "global", "files.create", true),
                         PermissionService.NewPermissionNode("group:default", "global", "chat.create", true)

DysonNetwork.Sphere/Post/Post.cs

@@ -42,6 +42,7 @@ public class Post : ModelBase
     public int ViewsTotal { get; set; }
     public int Upvotes { get; set; }
     public int Downvotes { get; set; }
+    [NotMapped] public Dictionary<string, int> ReactionsCount { get; set; } = new();
 
     public long? ThreadedPostId { get; set; }
     public Post? ThreadedPost { get; set; }
@@ -106,5 +107,6 @@ public class PostReaction : ModelBase
 
     public long PostId { get; set; }
     [JsonIgnore] public Post Post { get; set; } = null!;
+    public long AccountId { get; set; }
     public Account.Account Account { get; set; } = null!;
-}
+}

DysonNetwork.Sphere/Post/PostController.cs

@@ -2,6 +2,7 @@ using System.ComponentModel.DataAnnotations;
 using System.Text.Json;
 using DysonNetwork.Sphere.Account;
 using DysonNetwork.Sphere.Permission;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using NodaTime;
@@ -36,6 +37,11 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
             .Take(take)
             .ToListAsync();
         posts = PostService.TruncatePostContent(posts);
+        
+        var postsId = posts.Select(e => e.Id).ToList();
+        var reactionMaps = await ps.GetPostReactionMapBatch(postsId);
+        foreach (var post in posts)
+            post.ReactionsCount = reactionMaps[post.Id];
 
         Response.Headers["X-Total"] = totalCount.ToString();
 
@@ -62,6 +68,8 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
             .FirstOrDefaultAsync();
         if (post is null) return NotFound();
 
+        post.ReactionsCount = await ps.GetPostReactionMap(post.Id);
+
         return Ok(post);
     }
 
@@ -73,13 +81,13 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
         var currentUser = currentUserValue as Account.Account;
         var userFriends = currentUser is null ? [] : await rels.ListAccountFriends(currentUser);
 
-        var post = await db.Posts
+        var parent = await db.Posts
             .Where(e => e.Id == id)
             .FirstOrDefaultAsync();
-        if (post is null) return NotFound();
+        if (parent is null) return NotFound();
 
         var totalCount = await db.Posts
-            .Where(e => e.RepliedPostId == post.Id)
+            .Where(e => e.RepliedPostId == parent.Id)
             .FilterWithVisibility(currentUser, userFriends, isListing: true)
             .CountAsync();
         var posts = await db.Posts
@@ -96,6 +104,11 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
             .Take(take)
             .ToListAsync();
         posts = PostService.TruncatePostContent(posts);
+        
+        var postsId = posts.Select(e => e.Id).ToList();
+        var reactionMaps = await ps.GetPostReactionMapBatch(postsId);
+        foreach (var post in posts)
+            post.ReactionsCount = reactionMaps[post.Id];
 
         Response.Headers["X-Total"] = totalCount.ToString();
 
@@ -194,6 +207,45 @@ public class PostController(AppDatabase db, PostService ps, RelationshipService
         return post;
     }
 
+    public class PostReactionRequest
+    {
+        [MaxLength(256)] public string Symbol { get; set; } = null!;
+        public PostReactionAttitude Attitude { get; set; }
+    }
+
+    [HttpPost("{id:long}/reactions")]
+    [Authorize]
+    [RequiredPermission("global", "posts.reactions.create")]
+    public async Task<ActionResult<PostReaction>> CreatePostReaction(long id, [FromBody] PostReactionRequest request)
+    {
+        HttpContext.Items.TryGetValue("CurrentUser", out var currentUserValue);
+        if (currentUserValue is not Account.Account currentUser) return Unauthorized();
+        var userFriends = await rels.ListAccountFriends(currentUser);
+
+        var post = await db.Posts
+            .Where(e => e.Id == id)
+            .Include(e => e.Publisher)
+            .FilterWithVisibility(currentUser, userFriends)
+            .FirstOrDefaultAsync();
+        if (post is null) return NotFound();
+
+        var isExistingReaction = await db.PostReactions
+            .AnyAsync(r => r.PostId == post.Id &&
+                           r.Symbol == request.Symbol &&
+                           r.AccountId == currentUser.Id);
+        var reaction = new PostReaction
+        {
+            Symbol = request.Symbol,
+            Attitude = request.Attitude,
+            PostId = post.Id,
+            AccountId = currentUser.Id
+        };
+        await ps.ModifyPostVotes(post, reaction, isExistingReaction);
+        
+        if (isExistingReaction) return NoContent();
+        return Ok(reaction);
+    }
+
     [HttpPatch("{id:long}")]
     public async Task<ActionResult<Post>> UpdatePost(long id, [FromBody] PostRequest request)
     {

DysonNetwork.Sphere/Post/PostService.cs

@@ -125,12 +125,12 @@ public class PostService(AppDatabase db, FileService fs, ActivityService act)
         if (post.Content?.RootElement is { ValueKind: JsonValueKind.Array })
         {
             var searchTextBuilder = new System.Text.StringBuilder();
-            
+
             if (!string.IsNullOrWhiteSpace(post.Title))
                 searchTextBuilder.AppendLine(post.Title);
             if (!string.IsNullOrWhiteSpace(post.Description))
                 searchTextBuilder.AppendLine(post.Description);
-            
+
             foreach (var element in post.Content.RootElement.EnumerateArray())
             {
                 if (element is { ValueKind: JsonValueKind.Object } &&
@@ -140,6 +140,7 @@ public class PostService(AppDatabase db, FileService fs, ActivityService act)
                     searchTextBuilder.Append(insertProperty.GetString());
                 }
             }
+
             post.SearchVector = EF.Functions.ToTsVector(searchTextBuilder.ToString().Trim());
         }
 
@@ -225,12 +226,12 @@ public class PostService(AppDatabase db, FileService fs, ActivityService act)
         if (post.Content?.RootElement is { ValueKind: JsonValueKind.Array })
         {
             var searchTextBuilder = new System.Text.StringBuilder();
-            
+
             if (!string.IsNullOrWhiteSpace(post.Title))
                 searchTextBuilder.AppendLine(post.Title);
             if (!string.IsNullOrWhiteSpace(post.Description))
                 searchTextBuilder.AppendLine(post.Description);
-            
+
             foreach (var element in post.Content.RootElement.EnumerateArray())
             {
                 if (element is { ValueKind: JsonValueKind.Object } &&
@@ -240,6 +241,7 @@ public class PostService(AppDatabase db, FileService fs, ActivityService act)
                     searchTextBuilder.Append(insertProperty.GetString());
                 }
             }
+
             post.SearchVector = EF.Functions.ToTsVector(searchTextBuilder.ToString().Trim());
         }
 
@@ -255,6 +257,62 @@ public class PostService(AppDatabase db, FileService fs, ActivityService act)
         await db.SaveChangesAsync();
         await fs.MarkUsageRangeAsync(post.Attachments, -1);
     }
+
+    /// <summary>
+    /// Calculate the total number of votes for a post.
+    /// This function helps you save the new reactions.
+    /// </summary>
+    /// <param name="post">Post that modifying</param>
+    /// <param name="reaction">The new / target reaction adding / removing</param>
+    /// <param name="isRemoving">Indicate this operation is adding / removing</param>
+    public async Task ModifyPostVotes(Post post, PostReaction reaction, bool isRemoving)
+    {
+        var isExistingReaction = await db.Set<PostReaction>()
+            .AnyAsync(r => r.PostId == post.Id && r.AccountId == reaction.AccountId);
+        if (isExistingReaction) return;
+
+        if (!isRemoving)
+        {
+            db.Add(reaction);
+            switch (reaction.Attitude)
+            {
+                case PostReactionAttitude.Positive:
+                    post.Upvotes++;
+                    break;
+                case PostReactionAttitude.Negative:
+                    post.Downvotes++;
+                    break;
+            }
+        }
+
+        await db.SaveChangesAsync();
+    }
+
+    public async Task<Dictionary<string, int>> GetPostReactionMap(long postId)
+    {
+        return await db.Set<PostReaction>()
+            .Where(r => r.PostId == postId)
+            .GroupBy(r => r.Symbol)
+            .ToDictionaryAsync(
+                g => g.Key,
+                g => g.Count()
+            );
+    }
+
+    public async Task<Dictionary<long, Dictionary<string, int>>> GetPostReactionMapBatch(List<long> postIds)
+    {
+        return await db.Set<PostReaction>()
+            .Where(r => postIds.Contains(r.PostId))
+            .GroupBy(r => r.PostId)
+            .ToDictionaryAsync(
+                g => g.Key,
+                g => g.GroupBy(r => r.Symbol)
+                    .ToDictionary(
+                        sg => sg.Key,
+                        sg => sg.Count()
+                    )
+            );
+    }
 }
 
 public static class PostQueryExtensions

DysonNetwork.sln.DotSettings.user

@@ -6,6 +6,7 @@
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