import { readFile } from 'fs/promises';
import { basename } from 'path';
/**
* Convert a local file to base64 with auto-detected MIME type
*/
export async function fileToBase64(filePath: string): Promise<{ data: string; mimetype: string; filename: string }> {
const buffer = await readFile(filePath);
const base64 = buffer.toString('base64');
// Auto-detect mimetype based on extension
const ext = filePath.split('.').pop()?.toLowerCase() || '';
const mimetypes: Record<string, string> = {
// Images
'jpg': 'image/jpeg',
'jpeg': 'image/jpeg',
'png': 'image/png',
'gif': 'image/gif',
'webp': 'image/webp',
'bmp': 'image/bmp',
'svg': 'image/svg+xml',
// Videos
'mp4': 'video/mp4',
'avi': 'video/x-msvideo',
'mov': 'video/quicktime',
'wmv': 'video/x-ms-wmv',
'flv': 'video/x-flv',
'webm': 'video/webm',
'mkv': 'video/x-matroska',
// Audio
'mp3': 'audio/mpeg',
'opus': 'audio/ogg; codecs=opus',
'ogg': 'audio/ogg',
'wav': 'audio/wav',
'flac': 'audio/flac',
'm4a': 'audio/mp4',
'aac': 'audio/aac',
// Documents
'pdf': 'application/pdf',
'doc': 'application/msword',
'docx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'xls': 'application/vnd.ms-excel',
'xlsx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'ppt': 'application/vnd.ms-powerpoint',
'pptx': 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'txt': 'text/plain',
'csv': 'text/csv',
'rtf': 'application/rtf',
// Archives
'zip': 'application/zip',
'rar': 'application/x-rar-compressed',
'7z': 'application/x-7z-compressed',
'tar': 'application/x-tar',
'gz': 'application/gzip',
// Code
'js': 'text/javascript',
'json': 'application/json',
'xml': 'application/xml',
'html': 'text/html',
'css': 'text/css',
'py': 'text/x-python',
'java': 'text/x-java',
'cpp': 'text/x-c++src',
'c': 'text/x-csrc',
'sh': 'application/x-sh',
};
const mimetype = mimetypes[ext] || 'application/octet-stream';
const filename = basename(filePath);
return { data: base64, mimetype, filename };
}
