[glm-grade=B] fix(notifications): repair UI/API contract drift — SMTP auth, event gate, test button (DC-092)

Three user-facing notification features were silently dead from contract
drift between the settings UI and the backend:

1. SMTP auth never applied: the UI sent email.user/email.pass while the
   manager read username/password. Route now normalizes aliases; legacy
   config files canonicalize at load.
2. Event toggles were cosmetic: UI sent camelCase keys (containerDown),
   the send() gate read kebab-case ('container-down'). EVENT_ALIASES now
   folds every known spelling (manager gate, route store, legacy files);
   UI sends and reads canonical keys.
3. Deploy/auto-restart notifications always dropped: deploy-success/
   deploy-failed/auto-restart were missing from DEFAULT events, and
   send('test') was itself gated -> the Test button was a no-op. Defaults
   added; 'test' bypasses the gate.

Also: strict boolean contract (string 'false' for secure/enabled rejected
— previously coerced truthy, silently forcing TLS), SMTP port bounds,
non-destructive credential merge (blank password no longer clobbers the
stored one), GET /config returns port/secure/to/username + hasPassword
(password never returned), full form prefill + keep-hint placeholder.

Verified live pre-fix: send('test')/'deploymentSuccess'/'auto-restart'
all returned 'not enabled'. Post-fix: +20 tests (route + manager),
full suite 2641/2641 (112 suites).

Judge: GLM-5.3 cold read via delegate_task (deleg_ad765d63), grade B,
ship, zero blockers; judge independently ran the DC-092 suites (38/38).
Polish #1 (canonical event for provider titles) folded in. Remaining
emitters with the same gate-miss class (recipeRemoved, workflow,
ssl-cert-expiry, dns-propagation, drift-detected, dependency-restart-*)
noted for a follow-up tick.

dashcaddy-api/__tests__/routes/notifications-dc092.routes.test.js

@@ -0,0 +1,267 @@
+/**
+ * DC-092: notifications config contract tests (route level).
+ *
+ * The settings UI and the backend drifted apart in three ways, all of which
+ * made user-facing features silently dead:
+ *   1. UI sent email.user/email.pass; backend read username/password →
+ *      SMTP auth never applied for UI-saved configs.
+ *   2. UI sent camelCase event keys (containerDown); the send() gate read
+ *      kebab-case keys (container-down) → event toggles were cosmetic.
+ *   3. deploy-success/deploy-failed/auto-restart were missing from DEFAULT
+ *      events → deploy + auto-restart notifications always dropped, and
+ *      'test' was gated too → the Test button was a no-op.
+ *   4. Non-boolean enabled/secure values (string "false") persisted as-is and
+ *      coerced truthy (!!secure) — silently forcing TLS.
+ *   5. UI password field roundtrip: GET /config omitted port/secure/to/
+ *      username, and an empty password on save clobbered the stored one.
+ *
+ * These tests pin the FIXED contract: alias normalization, strict booleans,
+ * event-key folding, non-destructive credential merge, redacted GET fields.
+ */
+
+'use strict';
+
+const express = require('express');
+const request = require('supertest');
+
+// Stub notification manager: in-memory config object, real merge semantics
+// are exercised through the route; manager-level canonicalization has its
+// own tests in notification-manager.test.js.
+function makeStubNotification(initial) {
+  const nm = {
+    config: initial,
+    getConfig() { return this.config; },
+    async saveConfig() { this.saved = JSON.parse(JSON.stringify(this.config)); return true; },
+    startHealthDaemon: jest.fn(),
+    stopHealthDaemon: jest.fn(),
+  };
+  return nm;
+}
+
+function buildApp(notification) {
+  const app = express();
+  app.use(express.json());
+  const notificationRoutes = require('../../routes/notifications');
+  app.use('/api/v1/notifications', notificationRoutes({
+    notification,
+    asyncHandler: (fn) => (req, res, next) => Promise.resolve(fn(req, res)).catch(next),
+    ok: (res, data) => res.json({ success: true, ...data }),
+  }));
+  // Inline error handler (same pattern as sites-dc074.routes.test.js): maps
+  // AppError.statusCode to the HTTP status and surfaces err.message.
+  app.use((err, req, res, next) => {
+    const status = err.statusCode || 500;
+    res.status(status).json({
+      error: err.message || 'Internal Server Error',
+      code: err.code || null,
+    });
+  });
+  return app;
+}
+
+const DEFAULTS = {
+  enabled: true,
+  providers: {
+    discord: { enabled: false, webhookUrl: '' },
+    telegram: { enabled: false, botToken: '', chatId: '' },
+    ntfy: { enabled: false, topic: '', serverUrl: 'https://ntfy.sh' },
+    email: { enabled: false, host: '', port: 587, to: '', from: '', username: '', password: '' },
+  },
+  events: {
+    'container-down': true,
+    'container-up': false,
+    'alert': true,
+    'backup-complete': true,
+    'backup-failed': true,
+    'update-available': true,
+    'deploy-success': true,
+    'deploy-failed': true,
+    'auto-restart': true,
+  },
+  healthCheck: { enabled: false },
+};
+
+function freshConfig() {
+  return JSON.parse(JSON.stringify(DEFAULTS));
+}
+
+describe('DC-092: POST /config field aliases and typing', () => {
+  test('UI spelling email.user/email.pass normalizes onto username/password', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { user: 'svc@example.com', pass: 'app-secret' } } });
+    expect(res.status).toBe(200);
+    expect(nm.config.providers.email.username).toBe('svc@example.com');
+    expect(nm.config.providers.email.password).toBe('app-secret');
+    expect(nm.config.providers.email.user).toBeUndefined();
+    expect(nm.config.providers.email.pass).toBeUndefined();
+  });
+
+  test('explicit username/password wins over user/pass aliases', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { user: 'legacy@x.com', pass: 'old', username: 'modern@x.com', password: 'new' } } });
+    expect(nm.config.providers.email.username).toBe('modern@x.com');
+    expect(nm.config.providers.email.password).toBe('new');
+  });
+
+  test('string "false" for secure is rejected, not coerced truthy', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { secure: 'false' } } });
+    expect(res.status).toBe(400);
+    expect(nm.config.providers.email.secure).toBeUndefined();
+  });
+
+  test('string enabled for any provider is rejected', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    for (const prov of ['discord', 'telegram', 'ntfy', 'email']) {
+      const res = await request(app)
+        .post('/api/v1/notifications/config')
+        .send({ providers: { [prov]: { enabled: 'true' } } });
+      expect(res.status).toBe(400);
+    }
+    const top = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ enabled: 'true' });
+    expect(top.status).toBe(400);
+  });
+
+  test('real booleans pass and persist', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ enabled: false, providers: { email: { secure: true } } });
+    expect(res.status).toBe(200);
+    expect(nm.config.enabled).toBe(false);
+    expect(nm.config.providers.email.secure).toBe(true);
+  });
+
+  test('SMTP port bounds enforced (0, 65536, non-integer rejected)', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    for (const bad of [0, 65536, 58.5, 'abc']) {
+      const res = await request(app)
+        .post('/api/v1/notifications/config')
+        .send({ providers: { email: { port: bad } } });
+      expect(res.status).toBe(400);
+    }
+    const good = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { port: 465 } } });
+    expect(good.status).toBe(200);
+    expect(nm.config.providers.email.port).toBe(465);
+  });
+});
+
+describe('DC-092: POST /config event-key folding', () => {
+  test('camelCase event keys fold onto canonical kebab keys', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ events: { containerDown: false, deploymentSuccess: false, resourceAlert: false } });
+    expect(res.status).toBe(200);
+    expect(nm.config.events['container-down']).toBe(false);
+    expect(nm.config.events['deploy-success']).toBe(false);
+    expect(nm.config.events['alert']).toBe(false);
+    // legacy camelCase keys must NOT be stored
+    expect(nm.config.events.containerDown).toBeUndefined();
+    expect(nm.config.events.deploymentSuccess).toBeUndefined();
+    expect(nm.config.events.resourceAlert).toBeUndefined();
+  });
+
+  test('canonical kebab keys accepted directly', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ events: { 'container-down': false, 'auto-restart': false } });
+    expect(res.status).toBe(200);
+    expect(nm.config.events['container-down']).toBe(false);
+    expect(nm.config.events['auto-restart']).toBe(false);
+  });
+
+  test('non-boolean event values rejected', async () => {
+    const nm = makeStubNotification(freshConfig());
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ events: { 'container-down': 'yes' } });
+    expect(res.status).toBe(400);
+  });
+});
+
+describe('DC-092: POST /config non-destructive credential merge', () => {
+  test('empty password does not clobber stored password', async () => {
+    const cfg = freshConfig();
+    cfg.providers.email.username = 'svc@example.com';
+    cfg.providers.email.password = 'stored-secret';
+    const nm = makeStubNotification(cfg);
+    const app = buildApp(nm);
+    const res = await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { host: 'smtp.example.com', password: '' } } });
+    expect(res.status).toBe(200);
+    expect(nm.config.providers.email.password).toBe('stored-secret');
+    expect(nm.config.providers.email.host).toBe('smtp.example.com');
+  });
+
+  test('empty username does not clobber stored username', async () => {
+    const cfg = freshConfig();
+    cfg.providers.email.username = 'svc@example.com';
+    const nm = makeStubNotification(cfg);
+    const app = buildApp(nm);
+    await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { username: '' } } });
+    expect(nm.config.providers.email.username).toBe('svc@example.com');
+  });
+
+  test('non-empty password overwrites', async () => {
+    const cfg = freshConfig();
+    cfg.providers.email.password = 'old';
+    const nm = makeStubNotification(cfg);
+    const app = buildApp(nm);
+    await request(app)
+      .post('/api/v1/notifications/config')
+      .send({ providers: { email: { password: 'rotated' } } });
+    expect(nm.config.providers.email.password).toBe('rotated');
+  });
+});
+
+describe('DC-092: GET /config redaction and roundtrip fields', () => {
+  test('returns port/secure/to/username/hasPassword but never the password', async () => {
+    const cfg = freshConfig();
+    cfg.providers.email = {
+      enabled: true,
+      host: 'smtp.example.com',
+      port: 465,
+      secure: true,
+      to: 'admin@example.com',
+      from: 'DashCaddy <noreply@example.com>',
+      username: 'svc@example.com',
+      password: 'super-secret',
+    };
+    const nm = makeStubNotification(cfg);
+    const app = buildApp(nm);
+    const res = await request(app).get('/api/v1/notifications/config');
+    expect(res.status).toBe(200);
+    const email = res.body.config.providers.email;
+    expect(email.port).toBe(465);
+    expect(email.secure).toBe(true);
+    expect(email.to).toBe('admin@example.com');
+    expect(email.username).toBe('svc@example.com');
+    expect(email.hasPassword).toBe(true);
+    expect(JSON.stringify(res.body)).not.toContain('super-secret');
+    expect(res.body.config.providers.email.password).toBeUndefined();
+  });
+});