feat(api): ✨ Add Emoji Reactions

classes/database/note.ts

@@ -1,5 +1,5 @@
-import type { Status } from "@versia/client/schemas";
-import { db, Instance } from "@versia/kit/db";
+import type { NoteReactionWithAccounts, Status } from "@versia/client/schemas";
+import { db, Instance, type Reaction } from "@versia/kit/db";
 import {
     EmojiToNote,
     Likes,
@@ -54,6 +54,7 @@ type NoteTypeWithRelations = NoteType & {
     reblogged: boolean;
     muted: boolean;
     liked: boolean;
+    reactions: Omit<typeof Reaction.$type, "note" | "author">[];
 };
 
 export type NoteTypeWithoutRecursiveRelations = Omit<
@@ -698,7 +699,13 @@ export class Note extends BaseInterface<typeof Notes, NoteTypeWithRelations> {
             edited_at: data.updatedAt
                 ? new Date(data.updatedAt).toISOString()
                 : null,
-            reactions: [],
+            reactions: this.getReactions(userFetching ?? undefined).map(
+                // Remove account_ids
+                (r) => ({
+                    ...r,
+                    account_ids: undefined,
+                }),
+            ),
             text: data.contentSource,
         };
     }
@@ -915,4 +922,67 @@ export class Note extends BaseInterface<typeof Notes, NoteTypeWithRelations> {
 
         return viewableDescendants;
     }
+
+    /**
+     * Get reactions for this note grouped by emoji name
+     * @param user - The user requesting reactions (to determine 'me' field)
+     * @returns Array of reactions grouped by emoji name with counts and account IDs
+     */
+    public getReactions(
+        user?: User,
+    ): z.infer<typeof NoteReactionWithAccounts>[] {
+        // Group reactions by emoji name (either emojiText for Unicode or formatted shortcode for custom)
+        const groupedReactions = new Map<
+            string,
+            {
+                count: number;
+                me: boolean;
+                account_ids: string[];
+            }
+        >();
+
+        for (const reaction of this.data.reactions) {
+            let emojiName: string;
+
+            // Determine emoji name based on type
+            if (reaction.emojiText) {
+                emojiName = reaction.emojiText;
+            } else if (reaction.emoji) {
+                emojiName = `:${reaction.emoji.shortcode}:`;
+            } else {
+                continue; // Skip invalid reactions
+            }
+
+            // Initialize group if it doesn't exist
+            if (!groupedReactions.has(emojiName)) {
+                groupedReactions.set(emojiName, {
+                    count: 0,
+                    me: false,
+                    account_ids: [],
+                });
+            }
+
+            const group = groupedReactions.get(emojiName);
+
+            if (!group) {
+                continue;
+            }
+
+            group.count += 1;
+            group.account_ids.push(reaction.authorId);
+
+            // Check if current user reacted with this emoji
+            if (user && reaction.authorId === user.id) {
+                group.me = true;
+            }
+        }
+
+        // Convert map to array format
+        return Array.from(groupedReactions.entries()).map(([name, data]) => ({
+            name,
+            count: data.count,
+            me: data.me,
+            account_ids: data.account_ids,
+        }));
+    }
 }

classes/database/reaction.ts

@@ -2,11 +2,13 @@ import { db, Emoji, Instance, type Note, User } from "@versia/kit/db";
 import { type Notes, Reactions, type Users } from "@versia/kit/tables";
 import { randomUUIDv7 } from "bun";
 import {
+    and,
     desc,
     eq,
     type InferInsertModel,
     type InferSelectModel,
     inArray,
+    isNull,
     type SQL,
 } from "drizzle-orm";
 import { config } from "~/config.ts";
@@ -156,6 +158,32 @@ export class Reaction extends BaseInterface<typeof Reactions, ReactionType> {
         return this.data.id;
     }
 
+    public static fromEmoji(
+        emoji: Emoji | string,
+        author: User,
+        note: Note,
+    ): Promise<Reaction | null> {
+        if (emoji instanceof Emoji) {
+            return Reaction.fromSql(
+                and(
+                    eq(Reactions.authorId, author.id),
+                    eq(Reactions.noteId, note.id),
+                    isNull(Reactions.emojiText),
+                    eq(Reactions.emojiId, emoji.id),
+                ),
+            );
+        }
+
+        return Reaction.fromSql(
+            and(
+                eq(Reactions.authorId, author.id),
+                eq(Reactions.noteId, note.id),
+                eq(Reactions.emojiText, emoji),
+                isNull(Reactions.emojiId),
+            ),
+        );
+    }
+
     public getUri(baseUrl: URL): URL {
         return this.data.uri
             ? new URL(this.data.uri)

classes/database/user.ts

@@ -6,7 +6,13 @@ import type {
     Source,
     Status as StatusSchema,
 } from "@versia/client/schemas";
-import { db, Media, Notification, PushSubscription } from "@versia/kit/db";
+import {
+    db,
+    Media,
+    Notification,
+    PushSubscription,
+    Reaction,
+} from "@versia/kit/db";
 import {
     EmojiToUser,
     Likes,
@@ -732,6 +738,48 @@ export class User extends BaseInterface<typeof Users, UserWithRelations> {
         }
     }
 
+    /**
+     * Add an emoji reaction to a note
+     * @param note - The note to react to
+     * @param emoji - The emoji to react with (Emoji object for custom emojis, or Unicode emoji)
+     * @returns The created reaction
+     */
+    public async react(note: Note, emoji: Emoji | string): Promise<void> {
+        const existingReaction = await Reaction.fromEmoji(emoji, this, note);
+
+        if (existingReaction) {
+            return; // Reaction already exists, don't create duplicate
+        }
+
+        // Create the reaction
+        await Reaction.insert({
+            id: randomUUIDv7(),
+            authorId: this.id,
+            noteId: note.id,
+            emojiText: emoji instanceof Emoji ? null : emoji,
+            emojiId: emoji instanceof Emoji ? emoji.id : null,
+        });
+
+        // TODO: Handle federation and notifications
+    }
+
+    /**
+     * Remove an emoji reaction from a note
+     * @param note - The note to remove reaction from
+     * @param emoji - The emoji to remove reaction for (Emoji object for custom emojis, or Unicode emoji)
+     */
+    public async unreact(note: Note, emoji: Emoji | string): Promise<void> {
+        const reactionToDelete = await Reaction.fromEmoji(emoji, this, note);
+
+        if (!reactionToDelete) {
+            return; // Reaction doesn't exist, nothing to delete
+        }
+
+        await reactionToDelete.delete();
+
+        // TODO: Handle federation and notifications
+    }
+
     public async notify(
         type: "mention" | "follow_request" | "follow" | "favourite" | "reblog",
         relatedUser: User,