fix(wechat): auto-repair missing share preview meta before page delivery

Pages with real HTML content but missing description, mindspace-cover, or
platform brand markers are patched in-place so WeChat link delivery no longer
fails after successful generation.

Co-authored-by: Cursor <cursoragent@cursor.com>

wechat-mp.mjs

@@ -2649,6 +2649,7 @@ export function createWechatMpService({
             bareCompletionReply,
             htmlGenerationNeedsRetry,
             replyHasPublicLinks,
+            topic: wechatIntent?.topic ?? intent?.agentText ?? '',
           });
           if (pageOutcome.action === 'session_retry') {
             throw new Error('stale_session_poisoned_completion');
@@ -2967,6 +2968,7 @@ export function createWechatMpService({
             bareCompletionReply,
             htmlGenerationNeedsRetry,
             replyHasPublicLinks,
+            topic: wechatIntent?.topic ?? intent?.agentText ?? '',
           });
           if (pageOutcome.action === 'session_retry' || pageOutcome.action === 'fail') {
             const text = pageOutcome.failureText ?? buildPagePublishFailureText();

wechat/handlers/page-generate.mjs

@@ -1,12 +1,28 @@
 import { buildPagePublishFailureText } from '../prompts/page-generate.mjs';
 import { selectSendableHtmlArtifacts, verifyPageArtifactContent } from '../verify/page-artifact.mjs';
+import { repairArtifactSharePreview } from '../verify/share-preview-repair.mjs';
 import { filterSharePreviewReadyArtifacts, verifyArtifactSharePreview } from '../verify/share-preview.mjs';
 
-export function evaluatePageGenerateSendableArtifacts({ verifiedArtifacts = [], confirmedArtifacts = [] } = {}) {
+export function evaluatePageGenerateSendableArtifacts({
+  verifiedArtifacts = [],
+  confirmedArtifacts = [],
+  repairContext = {},
+} = {}) {
   const sendable = selectSendableHtmlArtifacts({ verifiedArtifacts, confirmedArtifacts });
   const verified = sendable.filter((artifact) => verifyPageArtifactContent(artifact).ok);
   const candidates = verified.length > 0 ? verified : sendable;
-  return filterSharePreviewReadyArtifacts(candidates);
+  const ready = filterSharePreviewReadyArtifacts(candidates);
+  if (ready.length > 0) return ready;
+
+  const repaired = [];
+  for (const artifact of candidates) {
+    if (!verifyPageArtifactContent(artifact).ok) continue;
+    const result = repairArtifactSharePreview(artifact, repairContext);
+    if (result.ok && verifyArtifactSharePreview(artifact).ok) {
+      repaired.push(artifact);
+    }
+  }
+  return repaired;
 }
 
 /**
@@ -21,8 +37,18 @@ export function resolvePageGenerateOutcome({
   bareCompletionReply = false,
   htmlGenerationNeedsRetry = false,
   replyHasPublicLinks = false,
+  topic = '',
+  repairContext = {},
 }) {
-  const sendable = evaluatePageGenerateSendableArtifacts({ verifiedArtifacts, confirmedArtifacts });
+  const context = {
+    topic: String(topic || repairContext.topic || '').trim(),
+    ...repairContext,
+  };
+  const sendable = evaluatePageGenerateSendableArtifacts({
+    verifiedArtifacts,
+    confirmedArtifacts,
+    repairContext: context,
+  });
 
   if (sendable.length > 0) {
     return { action: 'send', artifacts: sendable };

wechat/verify/share-preview-repair.mjs

@@ -0,0 +1,107 @@
+import fs from 'node:fs';
+import { injectBeforeDocumentClosingHead } from '../../html-document-injection.mjs';
+import { normalizeCoverMetaSuggestion, upsertMindspaceCoverMeta } from '../../mindspace-cover-meta.mjs';
+import { preparePublishedPlatformBrand } from '../../mindspace-page-tag.mjs';
+import { artifactFileExists, verifyPageArtifactContent } from './page-artifact.mjs';
+import {
+  hasMindspaceCoverMeta,
+  hasPlatformBrandMarker,
+  hasShareDescription,
+  verifyArtifactSharePreview,
+  verifySharePreviewMeta,
+} from './share-preview.mjs';
+
+function escapeMetaAttribute(value) {
+  return String(value ?? '')
+    .replaceAll('&', '&')
+    .replaceAll('"', '"')
+    .replaceAll('<', '&lt;');
+}
+
+export function extractPageTitle(html) {
+  const match = String(html ?? '').match(/<title[^>]*>([\s\S]*?)<\/title>/i);
+  return match?.[1]?.replace(/<[^>]+>/g, '').trim() ?? '';
+}
+
+export function inferCoverMeta({ title = '', topic = '' } = {}) {
+  const source = `${title} ${topic}`.trim();
+  let tag = '报告';
+  let emoji = '📄';
+  let accent = '#667eea';
+  let accent2 = '#764ba2';
+  if (/攻略|旅行|游记|半日|地图|景点|路线/.test(source)) {
+    tag = '旅行';
+    emoji = '🏞️';
+    accent = '#2e7d32';
+    accent2 = '#1565c0';
+  } else if (/新闻|早报|热点|资讯|日报/.test(source)) {
+    tag = '资讯';
+    emoji = '📰';
+    accent = '#2563eb';
+    accent2 = '#0f172a';
+  } else if (/诗|诗词|散文|文学/.test(source)) {
+    tag = '文艺';
+    emoji = '🌿';
+    accent = '#2d5016';
+    accent2 = '#1a2a3a';
+  }
+  const subtitle = (title || topic || 'MindSpace 页面').trim().slice(0, 80);
+  return normalizeCoverMetaSuggestion({ tag, emoji, accent, accent2, subtitle, cover: '' });
+}
+
+export function repairSharePreviewHtml(html, { title = '', topic = '' } = {}) {
+  let next = String(html ?? '');
+  const resolvedTitle = String(title || extractPageTitle(next) || '').trim();
+  const summary = (topic || resolvedTitle || 'MindSpace 页面').trim().slice(0, 160);
+
+  if (!hasShareDescription(next)) {
+    const meta = `<meta name="description" content="${escapeMetaAttribute(summary)}">`;
+    next = injectBeforeDocumentClosingHead(next, `${meta}\n`);
+  }
+
+  if (!hasMindspaceCoverMeta(next)) {
+    next = upsertMindspaceCoverMeta(next, inferCoverMeta({ title: resolvedTitle, topic }));
+  }
+
+  if (!hasPlatformBrandMarker(next)) {
+    next = preparePublishedPlatformBrand(next);
+  }
+
+  return next;
+}
+
+export function repairArtifactSharePreview(artifact, { topic = '' } = {}) {
+  if (!artifactFileExists(artifact)) {
+    return { ok: false, reason: 'missing_file', changes: [] };
+  }
+  if (!verifyPageArtifactContent(artifact).ok) {
+    return { ok: false, reason: 'not_repairable_artifact', changes: [] };
+  }
+  const localPath = String(artifact.localPath ?? '').trim();
+  if (!localPath) {
+    return { ok: false, reason: 'missing_local_path', changes: [] };
+  }
+
+  const before = fs.readFileSync(localPath, 'utf8');
+  if (verifySharePreviewMeta(before).ok) {
+    return { ok: true, reason: null, changes: [], alreadyReady: true };
+  }
+
+  const title = extractPageTitle(before);
+  const after = repairSharePreviewHtml(before, { title, topic });
+  if (after === before) {
+    return { ok: false, reason: 'repair_noop', changes: [] };
+  }
+
+  const changes = [];
+  if (!hasShareDescription(before) && hasShareDescription(after)) changes.push('description');
+  if (!hasMindspaceCoverMeta(before) && hasMindspaceCoverMeta(after)) changes.push('mindspace_cover');
+  if (!hasPlatformBrandMarker(before) && hasPlatformBrandMarker(after)) changes.push('platform_brand');
+
+  fs.writeFileSync(localPath, after, 'utf8');
+  const verified = verifyArtifactSharePreview(artifact);
+  if (!verified.ok) {
+    return { ok: false, reason: verified.reason ?? 'repair_incomplete', changes };
+  }
+  return { ok: true, reason: null, changes };
+}

wechat/wechat-channel.test.mjs

@@ -22,6 +22,7 @@ import {
   verifyArtifactSharePreview,
   verifySharePreviewMeta,
 } from './verify/share-preview.mjs';
+import { repairSharePreviewHtml } from './verify/share-preview-repair.mjs';
 
 test('classifyWechatIntent detects page.generate', () => {
   const intent = classifyWechatIntent({
@@ -205,20 +206,30 @@ test('verifySharePreviewMeta requires mindspace-cover, description, and platform
   assert.equal(hasPlatformBrandMarker(withAll), true);
 });
 
-test('resolvePageGenerateOutcome fails when html lacks share preview meta', () => {
+test('repairSharePreviewHtml injects missing description, cover, and platform brand', () => {
+  const html = `<!doctype html><html><head><title>安吉德清半日攻略</title></head><body><main>${'内容'.repeat(200)}</main></body></html>`;
+  const repaired = repairSharePreviewHtml(html, { topic: '帮我把这个安吉攻略生成页面' });
+  assert.equal(verifySharePreviewMeta(repaired).ok, true);
+  assert.match(repaired, /name="description"/);
+  assert.match(repaired, /name="mindspace-cover"/);
+  assert.match(repaired, /data-mindspace-page-tag="platform-brand"/);
+});
+
+test('resolvePageGenerateOutcome repairs and sends when html lacks share preview meta', () => {
   const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'wechat-preview-'));
   const file = path.join(dir, 'page.html');
   writePreviewReadyHtml(file, { withCover: false });
   const outcome = resolvePageGenerateOutcome({
     reply: { text: '页面已生成 https://m.tkmind.cn/MindSpace/u/public/page.html' },
     confirmedArtifacts: [{ localPath: file, relativePath: 'public/page.html' }],
+    topic: '安吉攻略页面',
   });
-  assert.equal(outcome.action, 'fail');
-  assert.equal(outcome.reason, 'missing_mindspace_cover');
-  assert.match(outcome.failureText, /预览元数据/);
+  assert.equal(outcome.action, 'send');
+  assert.equal(outcome.artifacts.length, 1);
+  assert.equal(verifyArtifactSharePreview({ localPath: file }).ok, true);
 });
 
-test('resolvePageGenerateOutcome fails when html lacks platform brand marker', () => {
+test('resolvePageGenerateOutcome repairs and sends when html lacks platform brand marker', () => {
   const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'wechat-brand-'));
   const file = path.join(dir, 'page.html');
   writePreviewReadyHtml(file, { withBrand: false });
@@ -226,9 +237,9 @@ test('resolvePageGenerateOutcome fails when html lacks platform brand marker', (
     reply: { text: '页面已生成' },
     confirmedArtifacts: [{ localPath: file, relativePath: 'public/page.html' }],
   });
-  assert.equal(outcome.action, 'fail');
-  assert.equal(outcome.reason, 'missing_platform_brand');
-  assert.match(outcome.failureText, /平台品牌/);
+  assert.equal(outcome.action, 'send');
+  assert.equal(outcome.artifacts.length, 1);
+  assert.equal(hasPlatformBrandMarker(fs.readFileSync(file, 'utf8')), true);
 });
 
 test('resolvePageGenerateOutcome sends when share preview meta is present', () => {