Add automatic Threads link replies and sunrise preview card

server/threads/reply.ts

@@ -0,0 +1,25 @@
+import { readFile, writeFile, rename } from 'node:fs/promises';
+import { randomUUID } from 'node:crypto';
+import { publishReply } from './publisher.ts';
+
+/** A separate exclusive claim prevents concurrent or ambiguous reply retries. */
+export async function replyToPublished(recordPath: string, getToken: () => Promise<string>,
+  publish: typeof publishReply = publishReply) {
+  const record = JSON.parse(await readFile(recordPath, 'utf8'));
+  if (record.status !== 'published' || !record.postId || !record.imagesDeletedAt || !record.replyText) return;
+  const replyPath = `${recordPath}.reply.json`;
+  try {
+    const existing = JSON.parse(await readFile(replyPath, 'utf8'));
+    if (existing.status !== 'published') console.warn(`Reply outcome unknown; inspect ${replyPath} before retrying`);
+    return;
+  } catch (error) { if ((error as NodeJS.ErrnoException).code !== 'ENOENT') throw error; }
+  const token = await getToken();
+  const replyId = await publish(token, record.postId, record.replyText, record.replyUrl, async containerId => {
+    await writeFile(replyPath, JSON.stringify({ status: 'publishing', postId: record.postId, containerId }, null, 2),
+      { flag: 'wx', mode: 0o600 });
+  });
+  const temporary = `${replyPath}.${randomUUID()}.tmp`;
+  await writeFile(temporary, JSON.stringify({ status: 'published', postId: record.postId, replyId }, null, 2), { mode: 0o600 });
+  await rename(temporary, replyPath);
+  console.log(`Threads reply published: ${replyId}`);
+}