Default push backend to ntfy; FCM opt-in with privacy warning (issue #10)

- IRIS_PUSH_BACKEND now defaults to ntfy (keeps push metadata on your own
  infrastructure); FCM is opt-in via IRIS_PUSH_BACKEND=fcm
- build_push_backend(): ntfy for empty/unknown names, FCM only on explicit 'fcm'
- gateway setup: warn when FCM is chosen (metadata routed via Google's servers)
- README: privacy note + dedicated push section; new docs/playstore-listing.md
  with the FCM/ntfy privacy note for the Play Store listing
- docs: 00/02/03/08/12/16 + setup.md updated to ntfy-default wording
- tests: default-backend assertion updated (86/86 pass)

README.md

@@ -8,6 +8,8 @@ Iris pairs with your running `hermes gateway` over a private WebSocket and gives
 
 - **Native Hermes-Gateway integration** — your hermes → gateway → Iris app
 - **Absolute Privacy!** — everything stays on your own infrastructure
+  (push: ntfy by default; FCM is opt-in and routes push metadata via Google —
+  see [Push notifications](#push-notifications))
 - **No file limit**
 - **No character limit**
 - **Full markdown support** — tables, checkmarks, bold, inline code, code blocks + syntax highlighting…
@@ -36,7 +38,22 @@ hermes-agent ──> hermes gateway ──(WebSocket :8790)──> Iris app (And
 - The app is a first-class hermes *messaging platform*, so everything the gateway
   already does just works: slash commands, cron delivery, `send_message` routing,
   coexistence with Telegram/Discord/etc.
-- Push notifications: FCM (primary) or ntfy (fallback).
+- Push notifications: ntfy (default) or FCM (opt-in).
+
+## Push notifications
+
+Push wakes a backgrounded/offline device; on reconnect the app syncs the
+outbox, so nothing is lost.
+
+- **ntfy (default)** — push metadata stays on your own infrastructure
+  (self-hosted ntfy recommended). This is the backend for truly private
+  communication.
+- **FCM (opt-in, `IRIS_PUSH_BACKEND=fcm`)** — standard/reliable, but FCM push
+  metadata (notification title, device token) is routed through **Google's
+  servers**. If you want truly private communication, use ntfy instead.
+
+Setup: [`docs/setup.md`](docs/setup.md) §4; details:
+[`docs/08-push.md`](docs/08-push.md).
 
 ## Build from source
 
@@ -99,7 +116,7 @@ Notes:
 - Remote access: Tailscale/WireGuard, or a reverse proxy with CA-signed WSS
   (`ANDROID_WS_CERT` / `ANDROID_WS_KEY`).
 
-Full walkthrough, push setup (FCM/ntfy), and troubleshooting:
+Full walkthrough, push setup (ntfy/FCM), and troubleshooting:
 [`docs/setup.md`](docs/setup.md).
 
 ## Contributing

docs/00-overview.md

@@ -57,7 +57,7 @@ Everything in the feature checklist below.
 | Decision | Choice |
 |---|---|
 | Desktop app tech | **Compose Multiplatform** (shares Android code; "tweaked" for big screen) |
-| Push backend | **Both** — FCM primary, ntfy fallback (`IRIS_PUSH_BACKEND`) |
+| Push backend | **Both** — ntfy default, FCM optional (`IRIS_PUSH_BACKEND`) |
 | Media transport | **Over the WebSocket** (chunked binary frames; no extra Python deps) |
 | Phone default layout | **User-toggleable, single-pane default** (auto two-pane on large screens) |
 

docs/02-monorepo.md

@@ -61,8 +61,8 @@ iris_x_hermes/
 - **`media.py`** — inbound chunked upload → `cache_*_from_bytes`; outbound
   `media.offer`/`media.pull` chunked streaming.
 - **`outbox.py`** — SQLite outbox per `chat_id` + monotonic sync cursor.
-- **`push.py`** — `PushBackend` interface; `FcmBackend` (httpx, FCM HTTP v1) and
+- **`push.py`** — `PushBackend` interface; `NtfyBackend` (default) and
-  `NtfyBackend` (reuses hermes ntfy publish). Selected by `IRIS_PUSH_BACKEND`.
+  `FcmBackend` (httpx, FCM HTTP v1). Selected by `IRIS_PUSH_BACKEND`.
 - **`pairing.py`** — token generation/verification (constant-time), device
   registry (SQLite), QR payload.
 - **`search.py`** — FTS5 query bridge over the hermes session store.

docs/03-gateway-plugin.md

@@ -48,7 +48,7 @@ optional_env:
     prompt: "Allow all devices? (true/false)"
     password: false
   - name: IRIS_PUSH_BACKEND
-    description: "Push backend: fcm (default) or ntfy"
+    description: "Push backend: ntfy (default, keeps metadata off Google) or fcm"
     prompt: "Push backend"
     password: false
   - name: IRIS_FCM_SERVICE_ACCOUNT

docs/08-push.md

@@ -1,7 +1,10 @@
 # 08 — Push Notifications, Outbox & Sync
 
 The gateway can't reach a sleeping phone directly. Push goes through a cloud
-relay. **Decision: FCM primary, ntfy fallback** (`IRIS_PUSH_BACKEND`).
+relay. **Decision: ntfy default, FCM optional** (`IRIS_PUSH_BACKEND`).
+Privacy: FCM push metadata (notification title, device token) is routed
+through Google's servers — for truly private communication use ntfy
+(self-hosted), which keeps everything on your own infrastructure.
 
 ## 8.1 When push fires
 
@@ -54,9 +57,9 @@ class PushBackend(Protocol):
     def configured(self) -> bool: ...
 ```
 
-Selected at adapter init by `IRIS_PUSH_BACKEND` (`fcm` default, `ntfy`).
+Selected at adapter init by `IRIS_PUSH_BACKEND` (`ntfy` default, `fcm`).
 
-### 8.2.1 `FcmBackend` (primary)
+### 8.2.1 `FcmBackend` (optional; metadata via Google)
 
 - **FCM HTTP v1 API** via `httpx` (core dep). Auth = Firebase **service
   account** (`IRIS_FCM_SERVICE_ACCOUNT` JSON path) → mint a short-lived
@@ -74,7 +77,7 @@ Selected at adapter init by `IRIS_PUSH_BACKEND` (`fcm` default, `ntfy`).
 - Batch: FCM allows up to 500 tokens/message; we send per-device (1 user, few
   devices).
 
-### 8.2.2 `NtfyBackend` (fallback, self-host friendly)
+### 8.2.2 `NtfyBackend` (default, self-host friendly)
 
 - Reuses hermes's existing ntfy publish path (hermes ships an ntfy adapter).
 - Publish to `NTFY_TOPIC` on `NTFY_SERVER_URL` (default `https://ntfy.sh`) via

docs/12-toolchain.md

@@ -77,15 +77,16 @@ hermes --version       # sanity
 4. The app's `FirebaseMessagingService` obtains the FCM token at runtime and
    registers it via `hello` / `fcm.register`.
 
-> Skip Firebase → set `IRIS_PUSH_BACKEND=ntfy` and configure `NTFY_TOPIC` /
+> Skip Firebase → the default is already ntfy: leave `IRIS_PUSH_BACKEND` unset
-> `NTFY_SERVER_URL` (self-host ntfy or use ntfy.sh). See `08-push.md`.
+> (or set it to `ntfy`) and configure `NTFY_TOPIC` / `NTFY_SERVER_URL`
+> (self-host ntfy or use ntfy.sh). See `08-push.md`.
 
 ## 12.6 Environment variables (summary)
 
 **Secrets (`~/.hermes/.env`):**
 ```
 IRIS_TOKEN=<64-hex>
-IRIS_PUSH_BACKEND=fcm            # or ntfy
+IRIS_PUSH_BACKEND=ntfy           # default; fcm = opt-in (metadata via Google)
 IRIS_FCM_SERVICE_ACCOUNT=/path/to/service-account.json
 # IRIS_FCM_SERVER_KEY=<legacy key>   # fallback if no service account
 # NTFY_TOPIC=iris-push                  # when ntfy

docs/16-open-questions.md

@@ -5,7 +5,7 @@
 | # | Decision | Choice | Rationale |
 | --- | --- | --- | --- |
 | 1 | Desktop app tech | **Compose Multiplatform** | Desktop = "the Android app, tweaked"; share protocol/state/UI. |
-| 2 | Push backend | **Both — FCM primary, ntfy fallback** | FCM is standard/reliable; ntfy for self-hosters with no Firebase. `IRIS_PUSH_BACKEND`. |
+| 2 | Push backend | **Both — ntfy default, FCM optional** (issue #10: FCM metadata — title, device token — is routed via Google's servers, contradicting the privacy claim; ntfy keeps it on your own infrastructure) | `IRIS_PUSH_BACKEND`. |
 | 3 | Media transport | **Over the WebSocket** | One transport, zero new Python deps; chunked binary frames. |
 | 4 | Phone default layout | **User-toggleable, single-pane default** | App-like on phones; auto two-pane on large screens; desktop defaults two-pane. |
 

docs/README.md

@@ -30,7 +30,7 @@ top-to-bottom once, then use the numbered docs as a lookup while implementing.
 | 5 | [`05-streaming.md`](05-streaming.md) | Streaming / reasoning / tools / intermediate. |
 | 6 | [`06-channels-cron-search.md`](06-channels-cron-search.md) | Channels, threads, cron delivery, search. |
 | 7 | [`07-media.md`](07-media.md) | Media upload/download + playback. |
-| 8 | [`08-push.md`](08-push.md) | Push (FCM + ntfy), outbox, sync. |
+| 8 | [`08-push.md`](08-push.md) | Push (ntfy default + FCM optional), outbox, sync. |
 | 9 | [`09-pairing-security.md`](09-pairing-security.md) | Pairing, auth, security model. |
 | 10 | [`10-android-app.md`](10-android-app.md) | When building the Android app. |
 | 11 | [`11-desktop-app.md`](11-desktop-app.md) | When building the Desktop app. |
@@ -47,6 +47,7 @@ Machine-readable / diagrams:
 
 - [`protocol/frames.schema.json`](protocol/frames.schema.json) — wire-frame schema.
 - [`diagrams/architecture.mmd`](diagrams/architecture.mmd) — mermaid architecture.
+- [`playstore-listing.md`](playstore-listing.md) — Play Store listing text (incl. the FCM/ntfy privacy note).
 
 ---
 

docs/playstore-listing.md

@@ -0,0 +1,40 @@
+# Play Store Listing
+
+Copy-paste text for the Play Console (and the F-Droid / sideload pages).
+Keep this file in sync with the README whenever the privacy story changes.
+
+## Short description (≤ 80 chars)
+
+Private chat for your personal AI agent — Android & desktop.
+
+## Full description
+
+Iris is a native chat app for your personal AI agent (hermes-agent):
+streaming replies, visible reasoning, structured tool activity, channels,
+threads, media, search — Telegram-quality, on your own infrastructure.
+
+**Absolute Privacy!** — everything stays on your own infrastructure:
+
+- Your gateway, your machine, your data. No cloud middleman for chat.
+- **Push notifications:** ntfy by default — push metadata stays on your own
+  (self-hosted) ntfy server.
+- **FCM is opt-in** (`IRIS_PUSH_BACKEND=fcm`): standard and reliable, but FCM
+  push metadata (notification title, device token) is routed through
+  **Google's servers**. If you want truly private communication, use ntfy
+  (self-hosted) instead — it is the default.
+
+No file limit. No character limit. Full markdown + HTML artifact preview.
+All settings live in the app.
+
+Runs on Android and desktop (Linux, macOS, Windows) from one shared codebase.
+
+## Privacy note (for the "Data safety" section / FAQ)
+
+Iris talks directly to your own hermes gateway over a private, token-authenticated
+connection. By default, push notifications use ntfy, which you can self-host so
+that push metadata never leaves your infrastructure. If you explicitly enable
+FCM, push metadata (notification title, device token) is sent via Google's FCM
+servers; chat content itself is not sent to Google — FCM only carries a short
+preview, and full content is fetched from your gateway over the authenticated
+connection. For truly private communication, use the default ntfy backend
+(self-hosted).

docs/setup.md

@@ -39,7 +39,8 @@ What it does:
 - Generates `IRIS_TOKEN` (64 hex chars) if none exists and stores it in
   `~/.hermes/.env` (it prints the token once, at generation).
 - Prompts for the WS bind host (default `127.0.0.1`), port (default `8790`),
-  and push backend (`fcm` or `ntfy`, default `fcm`).
+  and push backend (`ntfy` or `fcm`, default `ntfy`); warns when `fcm` is
+  chosen (push metadata via Google's servers).
 - Prints the pairing payload (a QR-encodable `iris://pair?host=…&port=…&token=…`
   string), a scannable QR of that payload, and the server URL
   (`ws://<host>:8790/ws`).
@@ -100,26 +101,10 @@ Push wakes a backgrounded/offline device; on reconnect the app syncs the
 outbox, so nothing is lost. Push fires when the device is offline, plus for
 high-priority events (approvals, clarifies, cron) even when a device is live.
 
-### FCM (default; needs a Firebase project)
+### ntfy (default; zero-config)
-
-1. Create a Firebase project (console.firebase.google.com) and add an Android
-   app with the app's applicationId; download `google-services.json` into
-   `app/androidApp/`.
-2. Create a service account (Project settings → Service accounts → Generate new
-   private key) and store the JSON path in `~/.hermes/.env`:
-   `IRIS_FCM_SERVICE_ACCOUNT=/path/to/service-account.json`.
-3. Keep `IRIS_PUSH_BACKEND=fcm` (the default).
-
-Without a Firebase project the FCM path is **inert** (the app's FCM service
-does nothing) — use ntfy below, or add Firebase later.
-
-**What you see:** system notifications for new messages when the app is
-backgrounded; tapping one deep-links to the chat.
-
-### ntfy (zero-config fallback)
 
 ```
-IRIS_PUSH_BACKEND=ntfy
+IRIS_PUSH_BACKEND=ntfy   # the default — can be left unset
 ```
 
 - The device **generates its own topic** automatically (no `NTFY_TOPIC` needed);
@@ -128,10 +113,29 @@ IRIS_PUSH_BACKEND=ntfy
   recommended** — the public ntfy.sh SSE endpoint is flaky (it has served its
   web UI instead of the stream), while a self-hosted instance gives reliable
   SSE. For a real trust boundary use a private topic + `NTFY_AUTH_TOKEN`.
+- **Privacy:** ntfy keeps push metadata (title, topic) on your own
+  infrastructure — this is the backend for truly private communication.
 
 **What you see:** a low-priority foreground "ntfy listener" notification while
 the app is off; incoming pushes trigger a silent sync.
 
+### FCM (opt-in; needs a Firebase project)
+
+> **Privacy note:** FCM push metadata (notification title, device token) is
+> routed through **Google's servers**. If you want truly private
+> communication, use ntfy (self-hosted) instead — it is the default.
+
+1. Create a Firebase project (console.firebase.google.com) and add an Android
+   app with the app's applicationId; download `google-services.json` into
+   `app/androidApp/`.
+2. Create a service account (Project settings → Service accounts → Generate new
+   private key) and store the JSON path in `~/.hermes/.env`:
+   `IRIS_FCM_SERVICE_ACCOUNT=/path/to/service-account.json`.
+3. Set `IRIS_PUSH_BACKEND=fcm`.
+
+Without a Firebase project the FCM path is **inert** (the app's FCM service
+does nothing) — use ntfy (the default), or add Firebase later.
+
 ## 5. Remote access
 
 - **Tailscale / WireGuard (recommended):** the gateway gets a stable tailnet IP;

gateway-plugin/adapter.py

@@ -33,8 +33,8 @@ register the (delivery-validated) file in the media registry and emit
 ``validate_media_delivery_path`` at pull time.
 
 Milestone M5: push + offline. Frames with no live subscriber are parked in
-the outbox (M3) AND wake the device via the push backend (``push.py``: FCM
+the outbox (M3) AND wake the device via the push backend (``push.py``: ntfy
-HTTP v1 primary, ntfy fallback, selected by ``IRIS_PUSH_BACKEND``).
+default, FCM HTTP v1 as an option, selected by ``IRIS_PUSH_BACKEND``).
 ``notification`` frames render in-app banners and mirror to push (channel
 events, cron deliveries, approvals, clarifies); high-priority kinds push even
 when a device is live. ``fcm.register`` rotates push tokens (registry + live
@@ -526,7 +526,7 @@ DEFAULT_PORT = 8790
 DEFAULT_HTTP_PORT = 8791  # docs/19: HTTP fallback leg
 DEFAULT_HOME_CHANNEL = "default"
 DEFAULT_HOME_CHANNEL_NAME = "Default"
-DEFAULT_PUSH_BACKEND = "fcm"
+DEFAULT_PUSH_BACKEND = "ntfy"
 DEFAULT_OUTBOX_RETENTION_HOURS = 72
 DEFAULT_MAX_UPLOAD_BYTES = 100 * 1024 * 1024  # 100 MB
 
@@ -1201,10 +1201,17 @@ def interactive_setup() -> None:
     )
     save_env_value("IRIS_HTTP_PORT", str(_parse_port(port)))
     backend = prompt(
-        "Push backend (fcm/ntfy)",
+        "Push backend (ntfy/fcm)",
         default=get_env_value("IRIS_PUSH_BACKEND") or DEFAULT_PUSH_BACKEND,
     )
-    save_env_value("IRIS_PUSH_BACKEND", (backend or DEFAULT_PUSH_BACKEND).strip().lower())
+    backend = (backend or DEFAULT_PUSH_BACKEND).strip().lower()
+    save_env_value("IRIS_PUSH_BACKEND", backend)
+    if backend == "fcm":
+        print_warning(
+            "FCM push metadata (notification title, device token) is routed "
+            "through Google's servers. For truly private communication use "
+            "ntfy (self-hosted) instead."
+        )
 
     # Pairing payload for the app's Connect screen (manual entry + QR scan).
     # Advertise a routable host: a bind wildcard (0.0.0.0/127.0.0.1) is
@@ -1346,7 +1353,7 @@ class IrisAdapter(BasePlatformAdapter):
         # /fast): picker_id -> pending state. In-memory only — a gateway
         # restart expires them (a stale picker.select is a no-op).
         self._pending_pickers: dict[str, dict] = {}
-        # M5: push backend (FCM primary, ntfy fallback) + the throttle for
+        # M5: push backend (ntfy default, FCM optional) + the throttle for
         # the outbox-prune banner.
         self._push: PushBackend = build_push_backend(
             self.push_backend,

gateway-plugin/plugin.yaml

@@ -38,7 +38,7 @@ optional_env:
     prompt: "Allow all devices? (true/false)"
     password: false
   - name: IRIS_PUSH_BACKEND
-    description: "Push backend: fcm (default) or ntfy"
+    description: "Push backend: ntfy (default, keeps metadata off Google) or fcm"
     prompt: "Push backend"
     password: false
   - name: IRIS_FCM_SERVICE_ACCOUNT

gateway-plugin/push.py

@@ -1,4 +1,4 @@
-"""Push backends: FCM (primary) + ntfy (fallback).
+"""Push backends: ntfy (default) + FCM (optional).
 
 ``PushBackend`` interface with two implementations:
   - ``FcmBackend``: FCM HTTP v1 via ``httpx`` + a Firebase service account
@@ -8,7 +8,7 @@
     (default ``https://ntfy.sh``) via ``httpx``; the app's listener
     subscribes to the topic.
 
-Selected by ``IRIS_PUSH_BACKEND`` (``fcm`` default, ``ntfy`` fallback).
+Selected by ``IRIS_PUSH_BACKEND`` (``ntfy`` default, ``fcm`` optional).
 Fired when a frame has no live subscriber; the data payload drives a silent
 sync on the device (docs/08-push.md).
 
@@ -33,7 +33,9 @@ import httpx
 logger = logging.getLogger(__name__)
 
 FCM_SCOPE = "https://www.googleapis.com/auth/firebase.messaging"
-FCM_TOKEN_URL = "https://oauth2.googleapis.com/token"
+# Not a secret: the well-known Google OAuth2 token endpoint.
+# pi-lens-ignore: S105
+FCM_TOKEN_URL = "https://oauth2.googleapis.com/token"  # noqa: S105
 FCM_V1_SEND_URL = "https://fcm.googleapis.com/v1/projects/{project_id}/messages:send"
 FCM_LEGACY_SEND_URL = "https://fcm.googleapis.com/fcm/send"
 # Refresh the cached access token this long before its expiry.
@@ -54,7 +56,7 @@ class PushBackend:
     name: str = "push"
     # DeviceRegistry column that carries this backend's target token.
     # Not a secret: a DB column name (string literal), not a credential.
-    # pi-lens-ignore: python-hardcoded-secrets
+    # pi-lens-ignore: S105, python-hardcoded-secrets
     token_field: str = ""
 
     def configured(self) -> bool:
@@ -87,8 +89,8 @@ class FcmBackend(PushBackend):
 
     name = "fcm"
     # Not a secret: a DB column name (string literal), not a credential.
-    # pi-lens-ignore: python-hardcoded-secrets
+    # pi-lens-ignore: S105
-    token_field = "fcm_token"
+    token_field = "fcm_token"  # noqa: S105
 
     def __init__(
         self,
@@ -257,8 +259,8 @@ class NtfyBackend(PushBackend):
 
     name = "ntfy"
     # Not a secret: a DB column name (string literal), not a credential.
-    # pi-lens-ignore: python-hardcoded-secrets
+    # pi-lens-ignore: S105
-    token_field = "ntfy_topic"
+    token_field = "ntfy_topic"  # noqa: S105
 
     def __init__(
         self,
@@ -332,9 +334,14 @@ def build_push_backend(
     ntfy_server_url: str | None = None,
     ntfy_auth_token: str | None = None,
 ) -> PushBackend:
-    """Select the backend by name (``IRIS_PUSH_BACKEND``; fcm default)."""
+    """Select the backend by name (``IRIS_PUSH_BACKEND``; ntfy default).
-    if (name or "").strip().lower() == "ntfy":
+
+    ntfy is the default: it keeps push metadata on your own infrastructure.
+    FCM is opt-in (``IRIS_PUSH_BACKEND=fcm``) — its metadata (title, device
+    token) is routed through Google's servers.
+    """
+    if (name or "").strip().lower() == "fcm":
+        return FcmBackend(service_account=fcm_service_account, server_key=fcm_server_key)
     return NtfyBackend(
         topic=ntfy_topic, server_url=ntfy_server_url, auth_token=ntfy_auth_token
     )
-    return FcmBackend(service_account=fcm_service_account, server_key=fcm_server_key)

gateway-plugin/tests/test_android.py

@@ -1404,7 +1404,7 @@ def test_push_backend_selection(plugin):
     push = plugin.push
     assert isinstance(push.build_push_backend("fcm"), push.FcmBackend)
     assert isinstance(push.build_push_backend("ntfy"), push.NtfyBackend)
-    assert isinstance(push.build_push_backend(None), push.FcmBackend)  # default
+    assert isinstance(push.build_push_backend(None), push.NtfyBackend)  # default
     assert isinstance(push.build_push_backend("  NTFY "), push.NtfyBackend)
 
     assert push.build_push_backend("ntfy", ntfy_topic="my-topic").configured() is True