Add automatic Threads link replies and sunrise preview card

tests/threads-reply.test.ts

@@ -0,0 +1,52 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { mkdtemp, writeFile, readFile, rm } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { replyToPublished } from '../server/threads/reply.ts';
+
+test('confirmed reply is recorded separately and skipped on restart', async () => {
+  const dir = await mkdtemp(join(tmpdir(), 'threads-reply-'));
+  const path = join(dir, 'record.json');
+  let calls = 0;
+  try {
+    const original = JSON.stringify({ status: 'published', postId: 'parent', imagesDeletedAt: 'now',
+      replyText: 'Link', replyUrl: 'https://example.com' });
+    await writeFile(path, original);
+    const publish = async (_token: string, post: string, text: string, url: string, claim: (id: string) => Promise<void>) => {
+      calls++;
+      assert.equal(post, 'parent');
+      assert.equal(text, 'Link');
+      assert.equal(url, 'https://example.com');
+      await claim('container');
+      return 'reply-id';
+    };
+    await replyToPublished(path, async () => 'token', publish);
+    await replyToPublished(path, async () => 'token', publish);
+    assert.equal(calls, 1);
+    assert.equal(await readFile(path, 'utf8'), original);
+    assert.equal(JSON.parse(await readFile(`${path}.reply.json`, 'utf8')).replyId, 'reply-id');
+  } finally { await rm(dir, { recursive: true, force: true }); }
+});
+
+test('reply waits for image cleanup, and a lost publish response is never sent twice', async () => {
+  const dir = await mkdtemp(join(tmpdir(), 'threads-reply-'));
+  const path = join(dir, 'record.json');
+  const record = { status: 'published', postId: 'parent', replyText: 'Link', replyUrl: 'https://example.com' };
+  let calls = 0;
+  const publish = async (_token: string, _post: string, _text: string, _url: string, claim: (id: string) => Promise<void>) => {
+    calls++;
+    await claim('container');
+    throw new Error('Connection lost');
+  };
+  try {
+    await writeFile(path, JSON.stringify(record));
+    await replyToPublished(path, async () => 'token', publish);
+    assert.equal(calls, 0);
+    await writeFile(path, JSON.stringify({ ...record, imagesDeletedAt: 'now' }));
+    await assert.rejects(replyToPublished(path, async () => 'token', publish), /Connection lost/);
+    await replyToPublished(path, async () => 'token', publish);
+    assert.equal(calls, 1);
+    assert.equal(JSON.parse(await readFile(`${path}.reply.json`, 'utf8')).status, 'publishing');
+  } finally { await rm(dir, { recursive: true, force: true }); }
+});