feat(swarm): Add remote like tracking and federated like status queries

- Add remoteLikes table to track likes from federated nodes on local posts
- Implement deduplication logic in like/unlike endpoints to prevent duplicate remote likes
- Add GET endpoint at /api/swarm/posts/[id]/likes to query like status from origin nodes
- Enhance POST feed endpoint to separate local and swarm posts for interaction checks
- Query origin nodes in real-time to populate isLiked flag for federated posts in feeds
- Add error handling and 3-second timeout for remote like status queries
- Update schema to support remote like tracking with actor handle and domain

src/app/api/posts/route.ts

@@ -686,31 +686,80 @@ export async function GET(request: Request) {
 
             if (session?.user && feedPosts && feedPosts.length > 0) {
                 const viewer = session.user;
-                const postIds = feedPosts.map((p: { id: string }) => p.id).filter(Boolean);
+                const nodeDomain = process.env.NEXT_PUBLIC_NODE_DOMAIN || 'localhost:3000';
+                
+                // Separate local and swarm posts
+                const localPostIds: string[] = [];
+                const swarmPosts: Array<{ id: string; domain: string; originalId: string }> = [];
+                
+                for (const p of feedPosts as Array<{ id: string }>) {
+                    if (p.id.startsWith('swarm:')) {
+                        const parts = p.id.split(':');
+                        if (parts.length >= 3) {
+                            swarmPosts.push({
+                                id: p.id,
+                                domain: parts[1],
+                                originalId: parts[2],
+                            });
+                        }
+                    } else {
+                        localPostIds.push(p.id);
+                    }
+                }
 
-                if (postIds.length > 0) {
+                // Check local likes
+                const likedPostIds = new Set<string>();
+                const repostedPostIds = new Set<string>();
+                
+                if (localPostIds.length > 0) {
                     const viewerLikes = await db.query.likes.findMany({
                         where: and(
                             eq(likes.userId, viewer.id),
-                            inArray(likes.postId, postIds)
+                            inArray(likes.postId, localPostIds)
                         ),
                     });
-                    const likedPostIds = new Set(viewerLikes.map(l => l.postId));
+                    viewerLikes.forEach(l => likedPostIds.add(l.postId));
 
                     const viewerReposts = await db.query.posts.findMany({
                         where: and(
                             eq(posts.userId, viewer.id),
-                            inArray(posts.repostOfId, postIds)
+                            inArray(posts.repostOfId, localPostIds)
                         ),
                     });
-                    const repostedPostIds = new Set(viewerReposts.map(r => r.repostOfId));
-
-                    feedPosts = feedPosts.map((p: { id: string }) => ({
-                        ...p,
-                        isLiked: likedPostIds.has(p.id),
-                        isReposted: repostedPostIds.has(p.id),
-                    })) as any;
+                    viewerReposts.forEach(r => { if (r.repostOfId) repostedPostIds.add(r.repostOfId); });
                 }
+
+                // Check swarm likes in real-time (query origin nodes)
+                if (swarmPosts.length > 0) {
+                    const checkPromises = swarmPosts.map(async (sp) => {
+                        try {
+                            const protocol = sp.domain.includes('localhost') ? 'http' : 'https';
+                            const url = `${protocol}://${sp.domain}/api/swarm/posts/${sp.originalId}/likes?checkHandle=${viewer.handle}&checkDomain=${nodeDomain}`;
+                            
+                            const res = await fetch(url, {
+                                headers: { 'Accept': 'application/json' },
+                                signal: AbortSignal.timeout(3000),
+                            });
+                            
+                            if (res.ok) {
+                                const data = await res.json();
+                                if (data.isLiked) {
+                                    likedPostIds.add(sp.id);
+                                }
+                            }
+                        } catch (err) {
+                            // Timeout or error - just skip
+                        }
+                    });
+                    
+                    await Promise.all(checkPromises);
+                }
+
+                feedPosts = feedPosts.map((p: { id: string }) => ({
+                    ...p,
+                    isLiked: likedPostIds.has(p.id),
+                    isReposted: repostedPostIds.has(p.id),
+                })) as any;
             }
         } catch (error) {
             console.error('Error populating interaction flags:', error);

src/app/api/swarm/interactions/like/route.ts

@@ -5,8 +5,8 @@
  */
 
 import { NextRequest, NextResponse } from 'next/server';
-import { db, posts, users, notifications } from '@/db';
-import { eq } from 'drizzle-orm';
+import { db, posts, users, notifications, remoteLikes } from '@/db';
+import { eq, and } from 'drizzle-orm';
 import { z } from 'zod';
 
 const swarmLikeSchema = z.object({
@@ -49,6 +49,26 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'Post not found' }, { status: 404 });
     }
 
+    // Check if already liked by this remote user
+    const existingLike = await db.query.remoteLikes.findFirst({
+      where: and(
+        eq(remoteLikes.postId, data.postId),
+        eq(remoteLikes.actorHandle, data.like.actorHandle),
+        eq(remoteLikes.actorNodeDomain, data.like.actorNodeDomain)
+      ),
+    });
+
+    if (existingLike) {
+      return NextResponse.json({ success: true, message: 'Already liked' });
+    }
+
+    // Track the remote like
+    await db.insert(remoteLikes).values({
+      postId: data.postId,
+      actorHandle: data.like.actorHandle,
+      actorNodeDomain: data.like.actorNodeDomain,
+    });
+
     // Increment like count
     await db.update(posts)
       .set({ likesCount: post.likesCount + 1 })

src/app/api/swarm/interactions/unlike/route.ts

@@ -5,8 +5,8 @@
  */
 
 import { NextRequest, NextResponse } from 'next/server';
-import { db, posts } from '@/db';
-import { eq } from 'drizzle-orm';
+import { db, posts, remoteLikes } from '@/db';
+import { eq, and } from 'drizzle-orm';
 import { z } from 'zod';
 
 const swarmUnlikeSchema = z.object({
@@ -42,10 +42,21 @@ export async function POST(request: NextRequest) {
       return NextResponse.json({ error: 'Post not found' }, { status: 404 });
     }
 
-    // Decrement like count (don't go below 0)
-    await db.update(posts)
-      .set({ likesCount: Math.max(0, post.likesCount - 1) })
-      .where(eq(posts.id, data.postId));
+    // Remove the remote like record
+    const deleted = await db.delete(remoteLikes)
+      .where(and(
+        eq(remoteLikes.postId, data.postId),
+        eq(remoteLikes.actorHandle, data.unlike.actorHandle),
+        eq(remoteLikes.actorNodeDomain, data.unlike.actorNodeDomain)
+      ))
+      .returning();
+
+    // Only decrement if we actually had a like record
+    if (deleted.length > 0) {
+      await db.update(posts)
+        .set({ likesCount: Math.max(0, post.likesCount - 1) })
+        .where(eq(posts.id, data.postId));
+    }
 
     console.log(`[Swarm] Received unlike from ${data.unlike.actorHandle}@${data.unlike.actorNodeDomain} on post ${data.postId}`);
 

src/app/api/swarm/posts/[id]/likes/route.ts

@@ -0,0 +1,100 @@
+/**
+ * Swarm Post Likes Endpoint
+ * 
+ * GET: Check who has liked a post (for real-time like status)
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import { db, posts, likes, users, remoteLikes } from '@/db';
+import { eq, and } from 'drizzle-orm';
+
+type RouteContext = { params: Promise<{ id: string }> };
+
+/**
+ * GET /api/swarm/posts/[id]/likes
+ * 
+ * Returns like information for a post.
+ * Query params:
+ *   - checkHandle: Check if a specific handle has liked this post
+ *   - checkDomain: The domain of the user to check (required with checkHandle for remote users)
+ */
+export async function GET(request: NextRequest, context: RouteContext) {
+  try {
+    if (!db) {
+      return NextResponse.json({ error: 'Database not available' }, { status: 503 });
+    }
+
+    const { id: postId } = await context.params;
+    const { searchParams } = new URL(request.url);
+    const checkHandle = searchParams.get('checkHandle');
+    const checkDomain = searchParams.get('checkDomain');
+
+    // Find the post
+    const post = await db.query.posts.findFirst({
+      where: eq(posts.id, postId),
+    });
+
+    if (!post || post.isRemoved) {
+      return NextResponse.json({ error: 'Post not found' }, { status: 404 });
+    }
+
+    // If checking a specific handle
+    if (checkHandle) {
+      // If domain is provided, check remote likes
+      if (checkDomain) {
+        const remoteLike = await db.query.remoteLikes.findFirst({
+          where: and(
+            eq(remoteLikes.postId, postId),
+            eq(remoteLikes.actorHandle, checkHandle),
+            eq(remoteLikes.actorNodeDomain, checkDomain)
+          ),
+        });
+
+        return NextResponse.json({
+          postId,
+          likesCount: post.likesCount,
+          isLiked: !!remoteLike,
+          checkedHandle: checkHandle,
+          checkedDomain: checkDomain,
+        });
+      }
+
+      // No domain = local user
+      const localUser = await db.query.users.findFirst({
+        where: eq(users.handle, checkHandle),
+      });
+
+      if (localUser) {
+        const liked = await db.query.likes.findFirst({
+          where: and(
+            eq(likes.postId, postId),
+            eq(likes.userId, localUser.id)
+          ),
+        });
+
+        return NextResponse.json({
+          postId,
+          likesCount: post.likesCount,
+          isLiked: !!liked,
+          checkedHandle: checkHandle,
+        });
+      }
+
+      return NextResponse.json({
+        postId,
+        likesCount: post.likesCount,
+        isLiked: false,
+        checkedHandle: checkHandle,
+      });
+    }
+
+    // Return general like info
+    return NextResponse.json({
+      postId,
+      likesCount: post.likesCount,
+    });
+  } catch (error) {
+    console.error('[Swarm] Post likes error:', error);
+    return NextResponse.json({ error: 'Failed to get likes' }, { status: 500 });
+  }
+}

src/db/schema.ts

@@ -318,6 +318,38 @@ export const likesRelations = relations(likes, ({ one }) => ({
   }),
 }));
 
+// ============================================
+// REMOTE LIKES (likes from federated users on local posts)
+// ============================================
+
+export const remoteLikes = pgTable('remote_likes', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  postId: uuid('post_id').notNull().references(() => posts.id, { onDelete: 'cascade' }),
+  actorHandle: text('actor_handle').notNull(), // e.g., "user"
+  actorNodeDomain: text('actor_node_domain').notNull(), // e.g., "other.node"
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+}, (table) => [
+  index('remote_likes_post_idx').on(table.postId),
+  index('remote_likes_actor_idx').on(table.actorHandle, table.actorNodeDomain),
+  uniqueIndex('remote_likes_unique').on(table.postId, table.actorHandle, table.actorNodeDomain),
+]);
+
+// ============================================
+// REMOTE REPOSTS (reposts from federated users on local posts)
+// ============================================
+
+export const remoteReposts = pgTable('remote_reposts', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  postId: uuid('post_id').notNull().references(() => posts.id, { onDelete: 'cascade' }),
+  actorHandle: text('actor_handle').notNull(),
+  actorNodeDomain: text('actor_node_domain').notNull(),
+  createdAt: timestamp('created_at').defaultNow().notNull(),
+}, (table) => [
+  index('remote_reposts_post_idx').on(table.postId),
+  index('remote_reposts_actor_idx').on(table.actorHandle, table.actorNodeDomain),
+  uniqueIndex('remote_reposts_unique').on(table.postId, table.actorHandle, table.actorNodeDomain),
+]);
+
 // ============================================
 // NOTIFICATIONS
 // ============================================