feat: add SESSION_SECRET_FILE and OAUTH_CLIENT_SECRET_FILE env vars

lib/__tests__/config-route.test.ts

@@ -1,3 +1,4 @@
+import { unlink, writeFileSync } from "fs";
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 
 // Mock NextResponse before importing the route
@@ -24,6 +25,7 @@ describe('config API route', () => {
     delete process.env.OAUTH_CLIENT_ID;
     delete process.env.OAUTH_ISSUER_URL;
     delete process.env.SESSION_SECRET;
+    delete process.env.SESSION_SECRET_FILE;
     delete process.env.SETTINGS_SYNC_ENABLED;
     delete process.env.STALWART_FEATURES;
     delete process.env.DEV_MOCK_JMAP;
@@ -128,6 +130,19 @@ describe('config API route', () => {
 
     const config = await getConfig();
 
+    expect(config.rememberMeEnabled).toBe(true);
+	});
+
+  it('should enable rememberMe when SESSION_SECRET_FILE is set', async () => {
+    writeFileSync('./session-secret', 'test-secret');
+    process.env.SESSION_SECRET_FILE = './session-secret';
+
+    const config = await getConfig();
+
+    unlink('./session-secret', (err) => {
+      if (err) throw err;
+    });
+
     expect(config.rememberMeEnabled).toBe(true);
   });
 
@@ -138,6 +153,23 @@ describe('config API route', () => {
 
     process.env.SESSION_SECRET = 'test-secret';
     const config2 = await getConfig();
+    expect(config2.settingsSyncEnabled).toBe(true);
+	});
+
+  it('should enable settingsSync only when both SESSION_SECRET_FILE and SETTINGS_SYNC_ENABLED are set', async () => {
+    process.env.SETTINGS_SYNC_ENABLED = 'true';
+    const config1 = await getConfig();
+    expect(config1.settingsSyncEnabled).toBe(false);
+
+    writeFileSync('./session-secret', 'test-secret');
+    process.env.SESSION_SECRET_FILE = './session-secret';
+
+    const config2 = await getConfig();
+
+    unlink('./session-secret', (err) => {
+      if (err) throw err;
+    });
+
     expect(config2.settingsSyncEnabled).toBe(true);
   });
 

lib/admin/session.ts

@@ -1,6 +1,7 @@
 import { cookies } from 'next/headers';
 import { NextResponse } from 'next/server';
 import { createCipheriv, createDecipheriv, randomBytes, createHash } from 'node:crypto';
+import { readFileEnv } from '@/lib/read-file-env';
 import { ADMIN_SESSION_COOKIE, DEFAULT_ADMIN_SESSION_TTL } from './types';
 import type { AdminSessionPayload } from './types';
 
@@ -11,7 +12,7 @@ const TAG_LENGTH = 16;
 const MIN_SECRET_LENGTH = 32;
 
 function getKey(): Buffer {
-  const secret = process.env.SESSION_SECRET;
+  const secret = process.env.SESSION_SECRET || readFileEnv(process.env.SESSION_SECRET_FILE);
   if (!secret) throw new Error('SESSION_SECRET not configured');
   if (secret.length < MIN_SECRET_LENGTH) {
     throw new Error(

lib/auth/crypto.ts

@@ -1,5 +1,6 @@
 import { createCipheriv, createDecipheriv, randomBytes, createHash } from 'node:crypto';
 import { logger } from '@/lib/logger';
+import { readFileEnv } from '@/lib/read-file-env';
 
 const ALGORITHM = 'aes-256-gcm';
 const IV_LENGTH = 12;
@@ -8,7 +9,7 @@ const TAG_LENGTH = 16;
 const MIN_SECRET_LENGTH = 32;
 
 function getKey(): Buffer {
-  const secret = process.env.SESSION_SECRET;
+  const secret =  process.env.SESSION_SECRET || readFileEnv(process.env.SESSION_SECRET_FILE);
   if (!secret) throw new Error('SESSION_SECRET not configured');
   if (secret.length < MIN_SECRET_LENGTH) {
     throw new Error(

lib/oauth/token-exchange.ts

@@ -1,8 +1,9 @@
 import { logger } from '@/lib/logger';
 import { discoverOAuth } from '@/lib/oauth/discovery';
 import type { OAuthMetadata } from '@/lib/oauth/discovery';
+import { readFileEnv } from '@/lib/read-file-env';
 
-const CLIENT_SECRET = process.env.OAUTH_CLIENT_SECRET || '';
+const CLIENT_SECRET = process.env.OAUTH_CLIENT_SECRET || readFileEnv(process.env.OAUTH_CLIENT_SECRET_FILE) || '';
 
 export function getRequiredConfig() {
   const clientId = process.env.OAUTH_CLIENT_ID;

lib/read-file-env.ts

@@ -0,0 +1,13 @@
+import { readFileSync } from "fs";
+
+export function readFileEnv(path: string | undefined): string | null {
+	if (!path) {
+		return null;
+	}
+
+	try {
+		return readFileSync(path, "utf-8").trim();
+	} catch {
+		return null;
+	}
+}

lib/settings-sync.ts

@@ -3,13 +3,14 @@ import { readFile, writeFile, unlink, mkdir, rename } from 'node:fs/promises';
 import { existsSync } from 'node:fs';
 import path from 'node:path';
 import { logger } from '@/lib/logger';
+import { readFileEnv } from '@/lib/read-file-env';
 
 const ALGORITHM = 'aes-256-gcm';
 const IV_LENGTH = 12;
 const TAG_LENGTH = 16;
 
 function getKey(): Buffer {
-  const secret = process.env.SESSION_SECRET;
+  const secret = process.env.SESSION_SECRET || readFileEnv(process.env.SESSION_SECRET_FILE);
   if (!secret) throw new Error('SESSION_SECRET not configured');
   return createHash('sha256').update(secret).digest();
 }