simstudioai · BillLeoutsakosvl346 · Jul 8, 2026 · Jul 8, 2026 · Jul 8, 2026 · Jul 8, 2026
diff --git a/apps/docs/components/icons.tsx b/apps/docs/components/icons.tsx
@@ -1274,6 +1274,31 @@ export function xAIIcon(props: SVGProps<SVGSVGElement>) {
   )
 }
 
+export function TikTokIcon(props: SVGProps<SVGSVGElement>) {
+  return (
+    <svg
+      xmlns='http://www.w3.org/2000/svg'
+      viewBox='0 0 520.48 520.48'
+      width='1em'
+      height='1em'
+      {...props}
+    >
+      <path
+        fill='#ff004f'
+        d='m392.19,206.7v49.13c-8.6-.84-19.74-2.78-32.09-7.31-16.13-5.91-28.13-13.99-35.98-20.25v99.32l-.19-.31c.14,1.96.19,3.97.19,5.99,0,49.33-40.13,89.48-89.48,89.48s-89.48-40.15-89.48-89.48,40.13-89.5,89.48-89.5c4.82,0,9.57.39,14.2,1.13v48.43c-4.45-1.6-9.22-2.45-14.2-2.45-23.36,0-42.38,19-42.38,42.38s19.02,42.38,42.38,42.38,42.38-19.02,42.38-42.38c0-.88-.02-1.75-.08-2.63v-193.01h49.11c.18,4.16.35,8.34.53,12.51.33,8.19,3.25,16.05,8.32,22.49,5.97,7.57,14.76,16.36,27.13,23.38,11.57,6.56,22.45,9.38,30.15,10.7Z'
+      />
+      <path
+        fill='#00f7ef'
+        d='m375.32,166.81v49.13c-8.6-.84-19.74-2.78-32.09-7.31-16.13-5.91-28.13-13.99-35.98-20.25v99.32l-.19-.31c.14,1.96.19,3.97.19,5.99,0,49.33-40.13,89.48-89.48,89.48s-89.48-40.15-89.48-89.48,40.13-89.5,89.48-89.5c4.82,0,9.57.39,14.2,1.13v48.43c-4.45-1.6-9.22-2.45-14.2-2.45-23.36,0-42.38,19-42.38,42.38s19.02,42.38,42.38,42.38,42.38-19.02,42.38-42.38c0-.88-.02-1.75-.08-2.63V97.74h49.11c.18,4.16.35,8.34.53,12.51.33,8.19,3.25,16.05,8.33,22.49,5.97,7.57,14.76,16.36,27.13,23.38,11.57,6.56,22.45,9.38,30.15,10.7Z'
+      />
+      <path
+        fill='#fff'
+        d='m386.06,188.29v49.13c-8.6-.84-19.74-2.78-32.09-7.31-16.13-5.91-28.13-13.99-35.98-20.25v99.32l-.19-.31c.14,1.96.19,3.97.19,5.99,0,49.33-40.13,89.48-89.48,89.48s-89.48-40.15-89.48-89.48,40.13-89.5,89.48-89.5c4.82,0,9.57.39,14.2,1.13v48.43c-4.45-1.6-9.22-2.45-14.2-2.45-23.36,0-42.38,19-42.38,42.38s19.02,42.38,42.38,42.38,42.38-19.02,42.38-42.38c0-.88-.02-1.75-.08-2.63V119.22h49.11c.18,4.16.35,8.34.53,12.51.33,8.19,3.25,16.05,8.32,22.49,5.97,7.57,14.76,16.36,27.13,23.38,11.57,6.56,22.45,9.38,30.15,10.7Z'
+      />
+    </svg>
+  )
+}
+
 export function xIcon(props: SVGProps<SVGSVGElement>) {
   return (
     <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50' width='1em' height='1em' {...props}>

diff --git a/apps/docs/components/ui/icon-mapping.ts b/apps/docs/components/ui/icon-mapping.ts
@@ -212,6 +212,7 @@ import {
   TemporalIcon,
   TextractIcon,
   ThriveIcon,
+  TikTokIcon,
   TinybirdIcon,
   TrelloIcon,
   TriggerDevIcon,
@@ -473,6 +474,7 @@ export const blockTypeToIconMap: Record<string, IconComponent> = {
   textract: TextractIcon,
   textract_v2: TextractIcon,
   thrive: ThriveIcon,
+  tiktok: TikTokIcon,
   tinybird: TinybirdIcon,
   trello: TrelloIcon,
   trigger_dev: TriggerDevIcon,

diff --git a/apps/docs/content/docs/en/integrations/meta.json b/apps/docs/content/docs/en/integrations/meta.json
@@ -214,6 +214,7 @@
     "temporal",
     "textract",
     "thrive",
+    "tiktok",
     "tinybird",
     "trello",
     "trigger_dev",

diff --git a/apps/docs/content/docs/en/integrations/tiktok.mdx b/apps/docs/content/docs/en/integrations/tiktok.mdx
diff --git a/apps/sim/app/api/tools/tiktok/publish-video/route.ts b/apps/sim/app/api/tools/tiktok/publish-video/route.ts
@@ -0,0 +1,215 @@
+import { createLogger } from '@sim/logger'
+import { getErrorMessage } from '@sim/utils/errors'
+import { type NextRequest, NextResponse } from 'next/server'
+import { tiktokPublishVideoContract } from '@/lib/api/contracts/tiktok-tools'
+import { parseRequest } from '@/lib/api/server'
+import { checkInternalAuth } from '@/lib/auth/hybrid'
+import { generateRequestId } from '@/lib/core/utils/request'
+import { isPayloadSizeLimitError } from '@/lib/core/utils/stream-limits'
+import { withRouteHandler } from '@/lib/core/utils/with-route-handler'
+import {
+  getFileExtension,
+  getMimeTypeFromExtension,
+  processSingleFileToUserFile,
+} from '@/lib/uploads/utils/file-utils'
+import { downloadFileFromStorage } from '@/lib/uploads/utils/file-utils.server'
+import { assertToolFileAccess } from '@/app/api/files/authorization'
+import type { UserFile } from '@/executor/types'
+
+export const dynamic = 'force-dynamic'
+
+const logger = createLogger('TikTokPublishVideoAPI')
+
+const TIKTOK_VIDEO_MIME_TYPES = new Set(['video/mp4', 'video/quicktime', 'video/webm'])
+
+/** TikTok requires each chunk between 5MB and 64MB; the final chunk absorbs the remainder (up to ~2x this size, well under the 128MB cap). Capped at 1000 chunks total, which this default comfortably satisfies up to TikTok's 4GB video size limit. */
+const DEFAULT_CHUNK_SIZE = 10_000_000
+
+/** Maximum size this route will buffer in memory for a single file-upload request. TikTok's
+ * own limit is 4GB, but relaying that much through this server's memory per request isn't
+ * safe under concurrent load. Enforced before downloading the file so an oversized upload
+ * fails fast with a clean 413 instead of materializing hundreds of MB to multiple GB
+ * in-process. Users with larger files can use the "Public URL" source instead, since
+ * PULL_FROM_URL never routes bytes through this process. */
+const TIKTOK_MAX_VIDEO_BYTES = 250 * 1024 * 1024
+
+function computeChunkPlan(totalBytes: number): { chunkSize: number; totalChunkCount: number } {
+  if (totalBytes <= DEFAULT_CHUNK_SIZE) {
+    return { chunkSize: totalBytes, totalChunkCount: 1 }
+  }
+  const totalChunkCount = Math.floor(totalBytes / DEFAULT_CHUNK_SIZE)
+  return { chunkSize: DEFAULT_CHUNK_SIZE, totalChunkCount }
+}
+
+function resolveVideoMimeType(fileName: string, fileType: string | undefined): string {
+  if (fileType && TIKTOK_VIDEO_MIME_TYPES.has(fileType)) return fileType
+  const fromExtension = getMimeTypeFromExtension(getFileExtension(fileName))
+  return TIKTOK_VIDEO_MIME_TYPES.has(fromExtension) ? fromExtension : 'video/mp4'
+}
+
+async function uploadChunks(
+  uploadUrl: string,
+  buffer: Buffer,
+  mimeType: string,
+  requestId: string
+): Promise<void> {
+  const totalBytes = buffer.length
+  const { chunkSize, totalChunkCount } = computeChunkPlan(totalBytes)
+
+  for (let i = 0; i < totalChunkCount; i++) {
+    const start = i * chunkSize
+    const isLastChunk = i === totalChunkCount - 1
+    const end = isLastChunk ? totalBytes - 1 : start + chunkSize - 1
+    const chunk = buffer.subarray(start, end + 1)
+
+    const response = await fetch(uploadUrl, {
+      method: 'PUT',
+      headers: {
+        'Content-Type': mimeType,
+        'Content-Length': String(chunk.length),
+        'Content-Range': `bytes ${start}-${end}/${totalBytes}`,
+      },
+      body: new Uint8Array(chunk),
+    })
+
+    if (!response.ok) {
+      const errorText = await response.text().catch(() => '')
+      logger.error(`[${requestId}] TikTok chunk upload failed`, {
+        chunkIndex: i,
+        status: response.status,
+        errorText,
+      })
+      throw new Error(
+        `TikTok rejected video chunk ${i + 1}/${totalChunkCount}: ${response.status} ${errorText || response.statusText}`
+      )
+    }
+  }
+}
+
+export const POST = withRouteHandler(async (request: NextRequest) => {
+  const requestId = generateRequestId()
+
+  try {
+    const authResult = await checkInternalAuth(request, { requireWorkflowId: false })
+    if (!authResult.success || !authResult.userId) {
+      logger.warn(`[${requestId}] Unauthorized TikTok publish-video attempt: ${authResult.error}`)
+      return NextResponse.json(
+        { success: false, error: authResult.error || 'Authentication required' },
+        { status: 401 }
+      )
+    }
+
+    const parsed = await parseRequest(tiktokPublishVideoContract, request, {})
+    if (!parsed.success) return parsed.response
+    const data = parsed.data.body
+
+    let userFile: UserFile
+    try {
+      userFile = processSingleFileToUserFile(data.file, requestId, logger)
+    } catch (error) {
+      return NextResponse.json(
+        { success: false, error: getErrorMessage(error, 'Failed to process file') },
+        { status: 400 }
+      )
+    }
+
+    const denied = await assertToolFileAccess(userFile.key, authResult.userId, requestId, logger)
+    if (denied) return denied
+
+    logger.info(`[${requestId}] Downloading video from storage`, {
+      fileName: userFile.name,
+      size: userFile.size,
+    })
+
+    const fileBuffer = await downloadFileFromStorage(userFile, requestId, logger, {
+      maxBytes: TIKTOK_MAX_VIDEO_BYTES,
+    })
+    const mimeType = resolveVideoMimeType(userFile.name, userFile.type)
+    const { chunkSize, totalChunkCount } = computeChunkPlan(fileBuffer.length)
+
+    const initUrl =
+      data.mode === 'draft'
+        ? 'https://open.tiktokapis.com/v2/post/publish/inbox/video/init/'
+        : 'https://open.tiktokapis.com/v2/post/publish/video/init/'
+
+    const initBody: Record<string, unknown> = {
+      source_info: {
+        source: 'FILE_UPLOAD',
+        video_size: fileBuffer.length,
+        chunk_size: chunkSize,
+        total_chunk_count: totalChunkCount,
+      },
+    }
+    if (data.mode === 'direct') {
+      initBody.post_info = data.postInfo ?? {}
+    }
+
+    logger.info(`[${requestId}] Initializing TikTok video ${data.mode}`, {
+      videoSize: fileBuffer.length,
+      chunkSize,
+      totalChunkCount,
+    })
+
+    const initResponse = await fetch(initUrl, {
+      method: 'POST',
+      headers: {
+        Authorization: `Bearer ${data.accessToken}`,
+        'Content-Type': 'application/json; charset=UTF-8',
+      },
+      body: JSON.stringify(initBody),
+    })
+
+    const initData = await initResponse.json()
+
+    if (initData.error?.code && initData.error.code !== 'ok') {
+      logger.error(`[${requestId}] TikTok init failed`, { error: initData.error })
+      return NextResponse.json(
+        { success: false, error: initData.error.message || 'Failed to initialize TikTok upload' },
+        { status: initResponse.status >= 400 ? initResponse.status : 502 }
+      )
+    }
+
+    const publishId: string | undefined = initData.data?.publish_id
+    const uploadUrl: string | undefined = initData.data?.upload_url
+
+    if (!publishId || !uploadUrl) {
+      return NextResponse.json(
+        { success: false, error: 'TikTok did not return a publish ID and upload URL' },
+        { status: 502 }
+      )
+    }
+
+    try {
+      await uploadChunks(uploadUrl, fileBuffer, mimeType, requestId)
+    } catch (error) {
+      return NextResponse.json(
+        { success: false, error: getErrorMessage(error, 'Failed to upload video to TikTok') },
+        { status: 502 }
+      )
+    }
+
+    logger.info(`[${requestId}] TikTok video upload complete`, { publishId })
+
+    return NextResponse.json({ success: true, output: { publishId } })
+  } catch (error) {
+    if (isPayloadSizeLimitError(error)) {
+      logger.warn(`[${requestId}] Rejected oversized TikTok video upload`, {
+        maxBytes: error.maxBytes,
+        observedBytes: error.observedBytes,
+      })
+      const maxMb = Math.floor(TIKTOK_MAX_VIDEO_BYTES / (1024 * 1024))
+      return NextResponse.json(
+        {
+          success: false,
+          error: `Video exceeds the ${maxMb}MB limit for file uploads. Use a public video URL instead to post larger files.`,
+        },
+        { status: 413 }
+      )
+    }
+    logger.error(`[${requestId}] Error publishing video to TikTok:`, error)
+    return NextResponse.json(
+      { success: false, error: getErrorMessage(error, 'Internal server error') },
+      { status: 500 }
+    )
+  }
+})