feat: proactive notifications — email, NC Talk, Google Chat per user

notification.py now handles all three outbound channels. Email defaults
to the user's login address (google_email from auth.json); an optional
override can be set in channels.json. Google Chat uses an incoming
webhook URL. NC Talk was already wired, just needs notification_room set.

Settings page gains a Notifications section: channel dropdown, optional
email override, NC room token, and Google Chat webhook URL. All stored
in per-user channels.json.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cortex/notification.py

@@ -1,22 +1,21 @@
 """
 Outbound notification helpers — send messages to user channels proactively.
 
-Channel config lives in home/{user}/channels.json.
-Each channel that supports proactive notifications needs a notification_channel
-set to its key name (e.g. "nextcloud", "google_chat") in the user's channels.json:
+Channel config lives in home/{user}/channels.json:
   {
-    "notification_channel": "nextcloud",
+    "notification_channel": "email" | "nextcloud" | "google_chat",
+    "notification_email":   "<override address — defaults to login email>",
     "nextcloud": {
-      "url": "https://cloud.example.com",
-      "bot_secret": "...",
-      "notification_room": "<room-token>",
-      ...
+      "url": "...", "bot_secret": "...", "notification_room": "<token>", ...
+    },
+    "google_chat": {
+      "outbound_webhook": "https://chat.googleapis.com/v1/spaces/...", ...
     }
   }
 
 If notification_channel is absent, defaults to "nextcloud" if configured.
-If notification_room (for NCT) is absent, notifications are silently skipped.
 """
+import asyncio
 import hashlib
 import hmac
 import json
@@ -73,34 +72,89 @@ async def _notify_nct(nct: dict, message: str, username: str) -> None:
     await _send_nct_message(url, secret, room, message)
 
 
+async def _notify_email(username: str, message: str, email_override: str | None = None) -> None:
+    """Send notification via email. Address = override → google_email from auth.json."""
+    from auth_utils import _read_auth
+    from email_utils import send_email
+
+    to_addr = email_override or _read_auth(username).get("google_email", "").strip()
+    if not to_addr:
+        logger.warning("notify: no email address for %s — set notification_email in channels.json", username)
+        return
+
+    ok = await asyncio.to_thread(
+        send_email,
+        to_email=to_addr,
+        subject="Cortex",
+        body_text=message,
+        body_html=message.replace("\n", "<br>"),
+    )
+    if ok:
+        logger.info("notify email → %s (%d chars)", to_addr, len(message))
+    else:
+        logger.warning("notify: email send failed for %s", username)
+
+
+async def _notify_google_chat(webhook_url: str, message: str, username: str) -> None:
+    """POST a message to a Google Chat space via incoming webhook."""
+    body = json.dumps({"text": message}, ensure_ascii=False).encode("utf-8")
+    try:
+        async with httpx.AsyncClient() as client:
+            resp = await client.post(
+                webhook_url,
+                content=body,
+                headers={"Content-Type": "application/json"},
+                timeout=15,
+            )
+        if resp.status_code not in (200, 201):
+            logger.warning("notify Google Chat %s → HTTP %d: %s", username, resp.status_code, resp.text[:200])
+        else:
+            logger.info("notify Google Chat → %s (%d chars)", username, len(message))
+    except Exception as e:
+        logger.error("notify Google Chat error for %s: %s", username, e)
+
+
 async def notify(username: str, message: str, channel: str | None = None) -> None:
     """Send a notification to the user's preferred outbound channel.
 
     Channel resolution order:
       1. `channel` parameter if provided
       2. `notification_channel` key in channels.json
-      3. "nextcloud" if configured
+      3. "nextcloud" if notification_room is configured
       4. Silent no-op
 
-    To configure: set `notification_channel` in home/{user}/channels.json.
-    For NCT: also set `notification_room` in the nextcloud section.
+    Configure via home/{user}/channels.json — see module docstring.
     """
     from auth_utils import get_user_channels
     channels = get_user_channels(username)
 
     target = channel or channels.get("notification_channel", "").strip()
     if not target:
-        # Auto-detect: use nextcloud if configured
-        if "nextcloud" in channels:
+        # Auto-detect: nextcloud if a notification_room is set
+        nct = channels.get("nextcloud", {})
+        if nct.get("notification_room", "").strip():
             target = "nextcloud"
         else:
             return
 
-    if target == "nextcloud":
+    if target == "email":
+        email_override = channels.get("notification_email", "").strip() or None
+        await _notify_email(username, message, email_override=email_override)
+
+    elif target == "nextcloud":
         nct = channels.get("nextcloud")
         if not nct:
             logger.debug("notify: nextcloud not configured for %s", username)
             return
         await _notify_nct(nct, message, username)
+
+    elif target == "google_chat":
+        gc = channels.get("google_chat", {})
+        webhook = gc.get("outbound_webhook", "").strip()
+        if not webhook:
+            logger.debug("notify: google_chat outbound_webhook not set for %s", username)
+            return
+        await _notify_google_chat(webhook, message, username)
+
     else:
-        logger.debug("notify: channel %r not yet supported for outbound (user %s)", target, username)
+        logger.debug("notify: channel %r not supported for outbound (user %s)", target, username)

cortex/routers/settings.py

@@ -18,7 +18,7 @@ import jwt
 from fastapi import APIRouter, Form, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 
-from auth_utils import COOKIE_NAME, decode_token, check_credentials, set_password, _read_auth, _write_auth
+from auth_utils import COOKIE_NAME, decode_token, check_credentials, set_password, _read_auth, _write_auth, get_user_channels
 from persona import list_user_personas
 from config import settings as app_settings
 
@@ -73,6 +73,17 @@ def _settings_page(username: str, personas: list[str], back_persona: str = "", s
         allowlist_text = ""
     html = html.replace("{{ email_allowlist }}", allowlist_text)
 
+    # Notification channel settings
+    channels     = get_user_channels(username)
+    notify_ch    = _html.escape(channels.get("notification_channel", "") or "")
+    notify_email = _html.escape(channels.get("notification_email", "") or "")
+    nc_room      = _html.escape((channels.get("nextcloud") or {}).get("notification_room", "") or "")
+    gc_webhook   = _html.escape((channels.get("google_chat") or {}).get("outbound_webhook", "") or "")
+    html = html.replace("{{ notify_channel }}", notify_ch)
+    html = html.replace("{{ notify_email_override }}", notify_email)
+    html = html.replace("{{ nc_notify_room }}", nc_room)
+    html = html.replace("{{ gc_webhook }}", gc_webhook)
+
     persona_items = "\n".join(
         f'''<li>
           <a href="/{username}/{p}" class="persona-link">{p}</a>
@@ -240,6 +251,57 @@ async def rename_persona(
     return RedirectResponse("/settings", status_code=302)
 
 
+@router.post("/settings/notifications", include_in_schema=False)
+async def save_notifications(
+    request: Request,
+    notification_channel: str = Form(""),
+    notification_email: str = Form(""),
+    nc_notification_room: str = Form(""),
+    gc_outbound_webhook: str = Form(""),
+):
+    username = _get_session_user(request)
+    if not username:
+        return RedirectResponse("/login", status_code=302)
+
+    personas     = list_user_personas(username)
+    back_persona = _preferred_persona(request, username)
+
+    channels_path = app_settings.home_root() / username / "channels.json"
+    try:
+        channels = json.loads(channels_path.read_text())
+    except Exception:
+        channels = {}
+
+    # Top-level notification preference
+    notification_channel = notification_channel.strip()
+    if notification_channel in ("email", "nextcloud", "google_chat"):
+        channels["notification_channel"] = notification_channel
+    else:
+        channels.pop("notification_channel", None)
+
+    # Optional email address override (blank = use login email)
+    notification_email = notification_email.strip()
+    if notification_email:
+        channels["notification_email"] = notification_email
+    else:
+        channels.pop("notification_email", None)
+
+    # NC Talk notification room — nested under "nextcloud"
+    if "nextcloud" not in channels:
+        channels["nextcloud"] = {}
+    channels["nextcloud"]["notification_room"] = nc_notification_room.strip()
+
+    # Google Chat outbound webhook — nested under "google_chat"
+    if "google_chat" not in channels:
+        channels["google_chat"] = {}
+    channels["google_chat"]["outbound_webhook"] = gc_outbound_webhook.strip()
+
+    channels_path.write_text(json.dumps(channels, indent=2) + "\n")
+    logger.info("notifications updated for %s (channel=%s)", username, notification_channel or "none")
+    return HTMLResponse(_settings_page(username, personas, back_persona,
+                                       success="Notification settings saved."))
+
+
 @router.post("/settings/email-allowlist", include_in_schema=False)
 async def save_email_allowlist(
     request: Request,

cortex/static/settings.html

@@ -344,6 +344,55 @@
       </form>
     </div>
 
+    <!-- Notifications -->
+    <div class="section">
+      <h2>Notifications</h2>
+      <p style="font-size:0.8rem; color:var(--pg-muted); margin-bottom:0.85rem; line-height:1.55;">
+        Choose how Inara reaches out proactively — cron jobs, briefs, and future alerts.
+        Email defaults to your login address when no override is set.
+      </p>
+      <form method="POST" action="/settings/notifications">
+        <div class="field">
+          <label for="notification_channel">Notification channel</label>
+          <select id="notification_channel" name="notification_channel"
+                  data-value="{{ notify_channel }}"
+                  style="width:100%; padding:0.65rem 0.85rem; background:var(--pg-bg);
+                         border:1px solid var(--pg-border); border-radius:6px;
+                         color:var(--pg-text); font-size:0.95rem; outline:none;
+                         transition:border-color 0.15s;">
+            <option value="">None (disabled)</option>
+            <option value="email">Email</option>
+            <option value="nextcloud">Nextcloud Talk</option>
+            <option value="google_chat">Google Chat</option>
+          </select>
+        </div>
+        <div class="field">
+          <label for="notification_email">Email override
+            <span style="color:var(--pg-dim); font-weight:400;">(optional)</span>
+          </label>
+          <input type="email" id="notification_email" name="notification_email"
+                 value="{{ notify_email_override }}"
+                 placeholder="Leave blank to use login email"
+                 autocomplete="off">
+        </div>
+        <div class="field">
+          <label for="nc_notification_room">Nextcloud Talk room token</label>
+          <input type="text" id="nc_notification_room" name="nc_notification_room"
+                 value="{{ nc_notify_room }}"
+                 placeholder="Token from the Talk room URL"
+                 autocomplete="off" spellcheck="false">
+        </div>
+        <div class="field">
+          <label for="gc_outbound_webhook">Google Chat webhook URL</label>
+          <input type="url" id="gc_outbound_webhook" name="gc_outbound_webhook"
+                 value="{{ gc_webhook }}"
+                 placeholder="https://chat.googleapis.com/v1/spaces/…"
+                 autocomplete="off" spellcheck="false">
+        </div>
+        <button type="submit">Save notification settings</button>
+      </form>
+    </div>
+
     <!-- Browser cache -->
     <div class="section">
       <h2>Browser Cache</h2>
@@ -411,6 +460,12 @@
   </div>
 
   <script>
+    // Restore notification channel dropdown from injected value
+    (function() {
+      const sel = document.getElementById('notification_channel');
+      if (sel) sel.value = sel.dataset.value || '';
+    })();
+
     // Password confirmation check
     document.getElementById('password-form').addEventListener('submit', e => {
       const np  = document.getElementById('new_password').value;