Function copyKbDocumentBlob

apps/sim/lib/workspaces/fork/copy/copy-resources.ts:878–913

* Duplicate a KB document's stored blob to a fresh child-scoped KB storage key so the copied * document never points at the source's object. The child key is written with a `file_metadata` * ownership binding owned by the CHILD workspace (mirroring the canonical KB upload), so * `verifyKBFileAcce

(
  doc: { storageKey: string | null; filename: string; mimeType: string },
  childWorkspaceId: string,
  userId: string,
  requestId: string
)

 * copy fails - best-effort, so a single blob failure never aborts the KB.
 */
async function copyKbDocumentBlob(
  doc: { storageKey: string | null; filename: string; mimeType: string },
  childWorkspaceId: string,
  userId: string,
  requestId: string
): Promise<{ storageKey: string; fileUrl: string } | null> {
  if (!doc.storageKey) return null
  try {
    const buffer = await downloadFile({
      key: doc.storageKey,
      context: 'knowledge-base',
      maxBytes: MAX_FILE_SIZE,
    })
    const targetKey = generateKnowledgeBaseFileKey(doc.filename)
    await uploadFile({
      file: buffer,
      fileName: doc.filename,
      contentType: doc.mimeType,
      context: 'knowledge-base',
      customKey: targetKey,
      preserveKey: true,
      metadata: {
        userId,
        workspaceId: childWorkspaceId,
        originalName: doc.filename,
      },
    })
    return { storageKey: targetKey, fileUrl: `/api/files/serve/${encodeURIComponent(targetKey)}` }
  } catch (error) {
    logger.warn(`[${requestId}] Failed to copy KB document blob during fork; keeping source key`, {
      sourceStorageKey: doc.storageKey,
      error: getErrorMessage(error),
    })
    return null
  }
}