Initial commit

backend/app/base_modules/FileManager/services/file_preview_service.ts

@@ -0,0 +1,22 @@
+import { FileEntry } from '#base_modules/FileManager/types/entries'
+
+const PREVIEWABLE_TEXT_EXTENSIONS = ['txt', 'md', 'log', 'json', 'csv']
+
+export default class FilePreviewService {
+  public async withPreview(
+    entry: FileEntry,
+    getContent: () => Promise<string>
+  ): Promise<FileEntry & { content?: string }> {
+    if (!this.isPreviewableTextFile(entry.name)) return entry
+
+    const content = await getContent()
+
+    return { ...entry, content }
+  }
+
+  private isPreviewableTextFile(name: string): boolean {
+    const fileExt = name.split('.').pop()?.toLowerCase()
+
+    return PREVIEWABLE_TEXT_EXTENSIONS.includes(fileExt as string)
+  }
+}