feat: direct messages

1:1 conversations (userAId < userBId dedup pair), messages, per-participant read tracking (conversation_reads). Block relationship is enforced on every send. UI: /messages list + /messages/[id] thread (5s poll), MessageButton on profiles, unread-badged nav icon. This completes the social-feature backlog: notifications, rate limiting, blocking, reporting, search/discovery, mentions, DMs, plus fixes for the recipe-visibility 404, follow race, and 2-level comment thread cap found during the earlier audit. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-03 22:24:56 +02:00
parent a51ba85253
commit c3776238c7
16 changed files with 4815 additions and 0 deletions
@@ -0,0 +1,45 @@
+import { db, conversations, eq, and } from "@epicure/db";
+import { randomUUID } from "crypto";
+
+/** Normalizes a pair so (userAId, userBId) is order-independent. */
+function orderPair(idA: string, idB: string): [string, string] {
+  return idA < idB ? [idA, idB] : [idB, idA];
+}
+
+export async function findOrCreateConversation(userId1: string, userId2: string) {
+  const [userAId, userBId] = orderPair(userId1, userId2);
+
+  const existing = await db.query.conversations.findFirst({
+    where: and(eq(conversations.userAId, userAId), eq(conversations.userBId, userBId)),
+  });
+  if (existing) return existing;
+
+  const [created] = await db
+    .insert(conversations)
+    .values({ id: randomUUID(), userAId, userBId })
+    .onConflictDoNothing()
+    .returning();
+
+  if (created) return created;
+
+  // Lost a race with a concurrent insert — fetch what the winner created.
+  const row = await db.query.conversations.findFirst({
+    where: and(eq(conversations.userAId, userAId), eq(conversations.userBId, userBId)),
+  });
+  if (!row) throw new Error("Failed to create conversation");
+  return row;
+}
+
+export function isParticipant(
+  conversation: { userAId: string; userBId: string },
+  userId: string
+): boolean {
+  return conversation.userAId === userId || conversation.userBId === userId;
+}
+
+export function otherParticipantId(
+  conversation: { userAId: string; userBId: string },
+  userId: string
+): string {
+  return conversation.userAId === userId ? conversation.userBId : conversation.userAId;
+}