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packages/backend/src/config.ts

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+import './loadEnv.js';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+function env(name: string, fallback?: string): string {
+  const value = process.env[name] ?? fallback;
+  if (value === undefined) {
+    throw new Error(`Missing required env: ${name}`);
+  }
+  return value;
+}
+
+export const config = {
+  port: Number(process.env.PORT ?? 3000),
+  jwtSecret: env('JWT_SECRET', 'dev-only-change-me'),
+  publicUrl: env('PUBLIC_URL', 'http://localhost:3000').replace(/\/$/, ''),
+  internalUrl: env('INTERNAL_URL', 'http://localhost:3000').replace(/\/$/, ''),
+  onlyOfficeUrl: env('ONLYOFFICE_URL', 'http://localhost:8080').replace(/\/$/, ''),
+  onlyOfficeInternalUrl: env(
+    'ONLYOFFICE_INTERNAL_URL',
+    process.env.ONLYOFFICE_URL ?? 'http://localhost:8080',
+  ).replace(/\/$/, ''),
+  sessionTtlMs: Number(process.env.SESSION_TTL_MS ?? 900_000),
+  tempDir: env('TEMP_DIR', '/tmp/sejong'),
+  maxUploadMb: Number(process.env.MAX_UPLOAD_MB ?? 50),
+  publicDir: path.resolve(__dirname, '../public'),
+};
+
+/** Extensions handled by OnlyOffice (not HWP — that stays client-side via rhwp). */
+export const OFFICE_EXTENSIONS = new Set([
+  'docx',
+  'xlsx',
+  'pptx',
+  'odt',
+  'ods',
+  'odp',
+  'doc',
+  'xls',
+  'ppt',
+  'rtf',
+  'txt',
+  'pdf',
+  'csv',
+  'dotx',
+  'xltx',
+  'potx',
+]);
+
+export const HWP_EXTENSIONS = new Set(['hwp', 'hwpx']);