feat(federation): ✨ Implement inbound federation of likes and like deletion

api/users/:uuid/inbox/index.ts

@@ -12,12 +12,13 @@ import { eq } from "drizzle-orm";
 import { matches } from "ip-matching";
 import { z } from "zod";
 import { type ValidationError, isValidationError } from "zod-validation-error";
+import { Like } from "~/classes/database/like";
 import { Note } from "~/classes/database/note";
 import { Relationship } from "~/classes/database/relationship";
 import { User } from "~/classes/database/user";
 import { sendFollowAccept } from "~/classes/functions/user";
 import { db } from "~/drizzle/db";
-import { Notes, Notifications } from "~/drizzle/schema";
+import { Likes, Notes, Notifications } from "~/drizzle/schema";
 import { config } from "~/packages/config-manager";
 import { ErrorSchema } from "~/types/api";
 
@@ -363,6 +364,23 @@ export default apiRoute((app) =>
 
                     return context.text("Follow request rejected", 200);
                 },
+                "pub.versia:likes/Like": async (like) => {
+                    const author = await User.resolve(like.author);
+
+                    if (!author) {
+                        return context.json({ error: "Author not found" }, 400);
+                    }
+
+                    const note = await Note.resolve(like.liked);
+
+                    if (!note) {
+                        return context.json({ error: "Note not found" }, 400);
+                    }
+
+                    await author.like(note, like.uri);
+
+                    return context.text("Like added", 200);
+                },
                 // "delete" is a reserved keyword in JS
                 delete: async (delete_) => {
                     // Delete the specified object from database, if it exists and belongs to the user
@@ -401,6 +419,24 @@ export default apiRoute((app) =>
 
                             break;
                         }
+                        case "pub.versia:likes/Like": {
+                            const like = await Like.fromSql(
+                                eq(Likes.uri, toDelete),
+                                eq(Likes.likerId, user.id),
+                            );
+
+                            if (like) {
+                                await like.delete();
+                                return context.text("Like deleted", 200);
+                            }
+
+                            return context.json(
+                                {
+                                    error: "Like not found or not owned by user",
+                                },
+                                404,
+                            );
+                        }
                         default: {
                             return context.json(
                                 {

classes/database/user.ts

@@ -447,9 +447,10 @@ export class User extends BaseInterface<typeof Users, UserWithRelations> {
      *
      * If the note is already liked, it will return the existing like. Also creates a notification for the author of the note.
      * @param note The note to like
+     * @param uri The URI of the like, if it is remote
      * @returns The like object created or the existing like
      */
-    public async like(note: Note): Promise<Like> {
+    public async like(note: Note, uri?: string): Promise<Like> {
         // Check if the user has already liked the note
         const existingLike = await Like.fromSql(
             and(eq(Likes.likerId, this.id), eq(Likes.likedId, note.id)),
@@ -462,9 +463,10 @@ export class User extends BaseInterface<typeof Users, UserWithRelations> {
         const newLike = await Like.insert({
             likerId: this.id,
             likedId: note.id,
+            uri,
         });
 
-        if (note.author.data.instanceId === this.data.instanceId) {
+        if (this.isLocal() && note.author.isLocal()) {
             // Notify the user that their post has been favourited
             await db.insert(Notifications).values({
                 accountId: this.id,
@@ -472,7 +474,7 @@ export class User extends BaseInterface<typeof Users, UserWithRelations> {
                 notifiedId: note.author.id,
                 noteId: note.id,
             });
-        } else {
+        } else if (this.isLocal() && note.author.isRemote()) {
             // Federate the like
             this.federateToFollowers(newLike.toVersia());
         }
@@ -498,19 +500,19 @@ export class User extends BaseInterface<typeof Users, UserWithRelations> {
 
         await likeToDelete.delete();
 
-        // Remove any eventual notifications for this like
-        await db
-            .delete(Notifications)
-            .where(
-                and(
-                    eq(Notifications.accountId, this.id),
-                    eq(Notifications.type, "favourite"),
-                    eq(Notifications.notifiedId, note.author.id),
-                    eq(Notifications.noteId, note.id),
-                ),
-            );
-
-        if (this.isLocal() && note.author.isRemote()) {
+        if (this.isLocal() && note.author.isLocal()) {
+            // Remove any eventual notifications for this like
+            await db
+                .delete(Notifications)
+                .where(
+                    and(
+                        eq(Notifications.accountId, this.id),
+                        eq(Notifications.type, "favourite"),
+                        eq(Notifications.notifiedId, note.author.id),
+                        eq(Notifications.noteId, note.id),
+                    ),
+                );
+        } else if (this.isLocal() && note.author.isRemote()) {
             // User is local, federate the delete
             this.federateToFollowers(likeToDelete.unlikeToVersia(this));
         }

drizzle/migrations/0034_jittery_proemial_gods.sql

@@ -0,0 +1,2 @@
+ALTER TABLE "Likes" ADD COLUMN "uri" text;--> statement-breakpoint
+ALTER TABLE "Likes" ADD CONSTRAINT "Likes_uri_unique" UNIQUE("uri");

drizzle/migrations/meta/_journal.json

@@ -239,6 +239,13 @@
             "when": 1726491670160,
             "tag": "0033_panoramic_sister_grimm",
             "breakpoints": true
+        },
+        {
+            "idx": 34,
+            "version": "7",
+            "when": 1729789587213,
+            "tag": "0034_jittery_proemial_gods",
+            "breakpoints": true
         }
     ]
 }

drizzle/schema.ts

@@ -120,6 +120,7 @@ export const Markers = pgTable("Markers", {
 
 export const Likes = pgTable("Likes", {
     id: uuid("id").default(sql`uuid_generate_v7()`).primaryKey().notNull(),
+    uri: text("uri").unique(),
     likerId: uuid("likerId")
         .notNull()
         .references(() => Users.id, {