TikTok V6

src/app/(main)/api/tiktok/upload/route.ts

@@ -1,5 +1,12 @@
 import { NextRequest, NextResponse } from 'next/server';
-import { getValidTiktokTokens, getLiveTiktokAccessToken, tiktokApi, uploadBinaryToTiktok } from '@/lib/tiktok';
+import {
+  getValidTiktokTokens,
+  tiktokApi,
+  uploadBinaryToTiktok,
+  planTiktokChunks,
+  sniffVideoMimeType,
+  pollTiktokPublishStatus,
+} from '@/lib/tiktok';
 
 const isAdminRequest = (request: NextRequest) => {
   const adminKey = process.env.TIKTOK_ADMIN_KEY;
@@ -33,12 +40,29 @@ export async function POST(request: NextRequest) {
       if (typeof json?.videoBufferBase64 === 'string') {
         const videoBuffer = Buffer.from(json.videoBufferBase64, 'base64');
         const videoSize = videoBuffer.length;
+        if (!videoSize) {
+          return NextResponse.json(
+            { error: 'videoBufferBase64 decoded to an empty file.' },
+            { status: 400 }
+          );
+        }
+
+        // Validate by magic bytes, not by a client-supplied MIME string.
+        const mimeType = sniffVideoMimeType(videoBuffer);
+        if (!mimeType) {
+          return NextResponse.json(
+            { error: 'Video must be MP4, MOV, or WebM (magic-byte check failed).' },
+            { status: 400 }
+          );
+        }
+
+        const { chunkSize, totalChunkCount } = planTiktokChunks(videoSize);
         const initBody = {
           source_info: {
             source: 'FILE_UPLOAD',
             video_size: videoSize,
-            chunk_size: videoSize,
-            total_chunk_count: 1,
+            chunk_size: chunkSize,
+            total_chunk_count: totalChunkCount,
           },
         };
 
@@ -61,7 +85,7 @@ export async function POST(request: NextRequest) {
           );
         }
 
-        await uploadBinaryToTiktok(uploadUrl, videoBuffer, 'video/mp4');
+        await uploadBinaryToTiktok(uploadUrl, videoBuffer, mimeType);
       } else if (Array.isArray(json?.photos)) {
         const photos = json.photos as Array<{ url?: string } | string>;
         if (!photos.length) {
@@ -94,6 +118,18 @@ export async function POST(request: NextRequest) {
 
         const title = typeof json?.title === 'string' ? json.title.trim() : '';
         const description = typeof json?.description === 'string' ? json.description.trim() : '';
+        if (title.length > 90) {
+          return NextResponse.json(
+            { error: 'title must be at most 90 characters for TikTok photo posts.' },
+            { status: 400 }
+          );
+        }
+        if (description.length > 4000) {
+          return NextResponse.json(
+            { error: 'description must be at most 4000 characters for TikTok photo posts.' },
+            { status: 400 }
+          );
+        }
 
         const initBody = {
           media_type: 'PHOTO',
@@ -143,9 +179,16 @@ export async function POST(request: NextRequest) {
       );
     }
 
+    // INITIATED is not delivery. Poll until the draft reaches the creator's
+    // inbox (SEND_TO_USER_INBOX) or fails, bounded so the request finishes.
+    const finalStatus = await pollTiktokPublishStatus(publishId, { maxWaitMs: 45_000 });
+    status = finalStatus.status || status;
+
     return NextResponse.json({
       publish_id: publishId,
       status,
+      delivered: status === 'SEND_TO_USER_INBOX',
+      ...(finalStatus.failReason ? { fail_reason: finalStatus.failReason } : {}),
     });
   } catch (err) {
     const message = err instanceof Error ? err.message : 'Unknown error';

src/app/de/[slug]/page.tsx

@@ -23,7 +23,7 @@ export function generateMetadata({ params }: { params: { slug: string } }): Meta
   }
 
   const alternates = buildLanguageAlternates({
-    en: `/use-cases/${page.enSlug}`,
+    en: page.enPath ?? `/use-cases/${page.enSlug}`,
     de: page.href,
   });
 
@@ -101,6 +101,7 @@ export default function UseCaseDetailPageDe({
       heroImageAlt={page.heroImageAlt}
       authoritySignals={page.authoritySignals}
       directAnswer={page.directAnswer}
+      enableScrollReveal={page.enableScrollReveal}
       labels={{
         ...useCaseTemplateLabelsDe,
         faqTitle: `FAQ: ${page.title}`,