feat: add POST /notes/feed endpoint for multi-DID filtering

server.ts

@@ -4,6 +4,7 @@ import {
   deleteWebhooksByDid,
   getNotes,
   getNotesByDid,
+  getNotesByDids,
 } from "./src/data/db.ts";
 import { log } from "./src/log.ts";
 
@@ -28,6 +29,17 @@ router.get("/:did/notes", (ctx) => {
   ctx.response.body = getNotesByDid(did, cursor, limit);
 });
 
+router.post("/notes/feed", async (ctx) => {
+  const body = await ctx.request.body.json();
+  const { dids, cursor, limit } = body ?? {};
+  if (!Array.isArray(dids) || dids.length === 0) {
+    ctx.response.status = 400;
+    ctx.response.body = { error: "dids must be a non-empty array" };
+    return;
+  }
+  ctx.response.body = getNotesByDids(dids, cursor, Number(limit) || PAGINATION);
+});
+
 router.post("/:did/webhooks", async (ctx) => {
   const { did } = ctx.params;
   const body = await ctx.request.body.json();

src/data/db.ts

@@ -49,6 +49,23 @@ export const getNotesByDid = (did: string, cursor?: string, limit = 20) => {
   };
 };
 
+export const getNotesByDids = (dids: string[], cursor?: string, limit = 20) => {
+  if (dids.length === 0) return { notes: [] };
+  const placeholders = dids.map(() => "?").join(", ");
+  const notes = cursor
+    ? db.prepare(
+      `SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did IN (${placeholders}) AND rkey < ? ORDER BY rkey DESC LIMIT ?`,
+    ).all<NoteRow>(...dids, cursor, limit)
+    : db.prepare(
+      `SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did IN (${placeholders}) ORDER BY rkey DESC LIMIT ?`,
+    ).all<NoteRow>(...dids, limit);
+
+  return {
+    notes,
+    cursor: notes.length === limit ? notes[notes.length - 1].rkey : undefined,
+  };
+};
+
 export const deleteNote = ({ did, rkey }: { did: string; rkey: string }) => {
   db.exec("DELETE FROM note WHERE did = ? AND rkey = ?", did, rkey);
 };