Internalize all IM channel implementations

test/channels/feishu/message-utils.test.mjs

@@ -0,0 +1,50 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  conversationKey,
+  extractText,
+  isAllowedSender,
+  isBotSender,
+  splitText,
+} from '../../../src/channels/feishu/message-utils.mjs';
+
+test('extractText removes bot mentions', () => {
+  const event = {
+    message: {
+      message_type: 'text',
+      content: JSON.stringify({ text: '@_user_1 你好' }),
+      mentions: [{ key: '@_user_1' }],
+    },
+  };
+  assert.equal(extractText(event), '你好');
+});
+
+test('conversationKey isolates p2p users and groups', () => {
+  assert.equal(conversationKey({
+    sender: { sender_id: { open_id: 'ou_test' } },
+    message: { chat_type: 'p2p', chat_id: 'oc_private' },
+  }), 'p2p:ou_test');
+  assert.equal(conversationKey({
+    sender: { sender_id: { open_id: 'ou_test' } },
+    message: { chat_type: 'group', chat_id: 'oc_group' },
+  }), 'group:oc_group');
+});
+
+test('splitText preserves all text', () => {
+  const input = `${'a'.repeat(12)}\n${'b'.repeat(12)}`;
+  const chunks = splitText(input, 15);
+  assert.equal(chunks.join('\n'), input);
+  assert.ok(chunks.every((chunk) => chunk.length <= 15));
+});
+
+test('isBotSender rejects bot loops', () => {
+  assert.equal(isBotSender({ sender: { sender_type: 'bot' } }), true);
+  assert.equal(isBotSender({ sender: { sender_type: 'user' } }), false);
+});
+
+test('isAllowedSender enforces an open-id allowlist', () => {
+  const event = { sender: { sender_id: { open_id: 'ou_allowed' } } };
+  assert.equal(isAllowedSender(event, new Set()), false);
+  assert.equal(isAllowedSender(event, new Set(['ou_allowed'])), true);
+  assert.equal(isAllowedSender(event, new Set(['ou_other'])), false);
+});