feat: publish HoloLake model-native living system source

product-source/hololake-platform/src/utils/filePreview.ts

@@ -0,0 +1,61 @@
+import type { VaultEntry } from '../types'
+
+export type FilePreviewKind = 'image' | 'pdf' | 'audio' | 'video'
+
+const IMAGE_PREVIEW_EXTENSIONS = new Set([
+  'apng',
+  'avif',
+  'bmp',
+  'gif',
+  'ico',
+  'jpeg',
+  'jpg',
+  'png',
+  'svg',
+  'tif',
+  'tiff',
+  'webp',
+])
+const PDF_PREVIEW_EXTENSIONS = new Set(['pdf'])
+const AUDIO_PREVIEW_EXTENSIONS = new Set(['aac', 'flac', 'm4a', 'mp3', 'oga', 'ogg', 'opus', 'wav', 'wave'])
+const VIDEO_PREVIEW_EXTENSIONS = new Set(['m4v', 'mov', 'mp4', 'ogv', 'webm'])
+
+function extensionFromFilename(filename: string): string | null {
+  const lastSegment = filename.split(/[\\/]/u).pop() ?? filename
+  const dotIndex = lastSegment.lastIndexOf('.')
+  if (dotIndex <= 0 || dotIndex === lastSegment.length - 1) return null
+  return lastSegment.slice(dotIndex + 1).toLowerCase()
+}
+
+export function previewExtension(entry: Pick<VaultEntry, 'filename' | 'path'>): string | null {
+  return extensionFromFilename(entry.filename) ?? extensionFromFilename(entry.path)
+}
+
+export function isImagePreviewEntry(entry: Pick<VaultEntry, 'fileKind' | 'filename' | 'path'>): boolean {
+  return filePreviewKind(entry) === 'image'
+}
+
+export function isPdfPreviewEntry(entry: Pick<VaultEntry, 'fileKind' | 'filename' | 'path'>): boolean {
+  return filePreviewKind(entry) === 'pdf'
+}
+
+export function filePreviewKind(entry: Pick<VaultEntry, 'fileKind' | 'filename' | 'path'>): FilePreviewKind | null {
+  if (entry.fileKind && entry.fileKind !== 'binary') return null
+
+  const extension = previewExtension(entry)
+  if (!extension) return null
+  if (IMAGE_PREVIEW_EXTENSIONS.has(extension)) return 'image'
+  if (PDF_PREVIEW_EXTENSIONS.has(extension)) return 'pdf'
+  if (AUDIO_PREVIEW_EXTENSIONS.has(extension)) return 'audio'
+  if (VIDEO_PREVIEW_EXTENSIONS.has(extension)) return 'video'
+  return null
+}
+
+export function isFilePreviewEntry(entry: Pick<VaultEntry, 'fileKind' | 'filename' | 'path'>): boolean {
+  return filePreviewKind(entry) !== null
+}
+
+export function previewFileTypeLabel(entry: Pick<VaultEntry, 'filename' | 'path'>): string {
+  const extension = previewExtension(entry)
+  return extension ? `${extension.toUpperCase()} file` : 'File'
+}