notifications/docs/notification-click-actions.md

# Notification click actions

> **Update**: this doc captures the initial implementation pass. Destinations
> are no longer built from a hard-coded `FRONTEND_BASE_URL` — producers now
> send an `action_code` + `click_object_id_value`, resolved against the
> admin-managed `NotificationLink` table. See [implementation.md](implementation.md#the-click-action-mechanism)
> for the current mechanism and [frontend-notification-click-actions.md](frontend-notification-click-actions.md)
> for the current code catalog. The parts of this doc about `click_url` itself,
> optionality, and the escrow/billboard notification catalog are still accurate.

How a tapped push notification carries a destination, why that job splits across
several repos, and what still needs building outside this service.

## Your question, answered: frontend or backend?

Both, split cleanly:

- **Choosing the destination is a backend job.** A producer service (chat,
  promotions, advertising, ...) decides which screen a tap should open and
  hands that URL to this notifications service. That's what's implemented
  below.
- **Acting on the tap is unavoidably client-side.** Only the process that
  owns the tap event and the navigation stack — the Gooyal mobile/web app —
  can respond to it. No backend service can intercept a notification tap;
  Gotify's job ends the moment the message is delivered.

Not every notification is clickable, and `click_url` is a **non-required**
field end to end — see [Optionality](#optionality-not-every-notification-is-clickable).

## 1. How push flows across Gooyal today

Three other services vendor a generated client for this one
(`gooyal_notifications_client`) and call into it over OAuth2
client-credentials. Gotify then holds the message until the user's device
fetches it.

```
chat / promotions / advertising
        │  POST /push/application/<user_uuid>/application/
        ▼
notifications service (this repo)
        │  create_message, extras: client::notification.click.url
        ▼
Gotify 2.6.3
        │  push delivery
        ▼
Gooyal client app (repo not found in this workspace)
        │  tap → must read extras and navigate
        ▼
? destination screen
```

### What each producer sends today

| Service | Call site | Extras sent | Status |
|---|---|---|---|
| **chat** | `apps/chat/events/publishers/push.py:40` | Bespoke keys: `{"conversation_uuid", "post_id"}` — not Gotify's own convention | live, fires on every chat message |
| **promotions** | `apps/promotions/models.py:544` | `extras={}` | wired, unused |
| **advertising** | `apps/users/models.py:91` | — | call commented out entirely |

None of the three passed a click URL before this change. Chat's bespoke
`conversation_uuid`/`post_id` scheme implies some client already parses
custom keys per feature — every new use case would otherwise need its own
key and its own client-side handler. Standardizing on Gotify's own
`client::notification.click.url` convention means the client only needs one
tap handler instead of one per feature.

## 2. What changed in this repo (`notifications`)

Branch: `feature/notification-actions`.

Added a `click_url` field to `PushMessage` and one merge method that folds
it into Gotify's reserved `client::notification` extras namespace — the key
official Gotify clients already read on tap
([gotify.net/docs/pushmsg#extras](https://gotify.net/docs/pushmsg#extras)).
Both message-creation paths funnel through this one method, so there is
exactly one place that builds the payload Gotify receives.

`apps/push_notifications/models.py`:

```python
# reserved extras namespace — official clients open this url on tap
GOTIFY_CLICK_EXTRA_KEY = "client::notification"

click_url = models.URLField(max_length=1000, null=True, blank=True)

def get_gotify_extras(self):
    extras = dict(self.extras or {})
    if self.click_url:
        notification_extra = dict(extras.get(self.GOTIFY_CLICK_EXTRA_KEY) or {})
        notification_extra["click"] = {"url": self.click_url}
        extras[self.GOTIFY_CLICK_EXTRA_KEY] = notification_extra
    return extras
```

Any existing keys a producer already sends — chat's `conversation_uuid`,
for instance — pass through untouched. `click_url` is additive, never a
replacement.

### Optionality: not every notification is clickable

`click_url` is `null=True, blank=True` on the model, which makes it
`required=False` / `allow_null=True` / `allow_blank=True` on the DRF
serializer automatically — confirmed directly:

```python
>>> from apps.push_notifications.serializers import PushMessageSerializer
>>> PushMessageSerializer().get_fields()['click_url'].required
False
>>> PushMessageSerializer().get_fields()['click_url'].allow_null
True
```

When it's left unset, `get_gotify_extras()` returns `self.extras` completely
untouched — no `client::notification` key is added, so non-clickable
notifications are delivered exactly as before.

### Both message-creation paths were wired through it

| Path | Entry point | Change |
|---|---|---|
| **Single push** — used by chat / promotions / advertising | `POST /push/application/<user_uuid>/application/` | Added `click_url` to `PushMessageSerializer` — optional, alongside `title`/`message`/`extras` |
| **Bulk push** — admin-triggered Excel import | `BulkPushMessage.extract_data()` | Reads an optional 6th spreadsheet column as `click_url`; threaded through `push_to_all()` |

Bulk spreadsheet columns:

| Col | 0 | 1 | 2 | 3 | 4 | 5 (new) |
|---|---|---|---|---|---|---|
| Field | user_uuid | title | message | priority | extras (JSON) | click_url |

While extending `extract_data()` for the new column, fixed a pre-existing
bug on the same line: the extras cell was parsed with `json.loads(extras)`
— a name that was never assigned — instead of `extras_str`. Any bulk row
with a populated extras cell would have raised `NameError` before reaching
Gotify at all.

### Request/response example

Request:

```json
{
  "title": "Order shipped",
  "message": "Tap to view your order",
  "priority": 5,
  "extras": {},
  "click_url": "https://gooyal.ir/orders/123"
}
```

Echoed back by a live local Gotify 2.6.3 container (sent alongside a
simulated chat-style `conversation_uuid` extra, to prove coexistence):

```json
{
  "title": "Order shipped",
  "message": "Tap to view your order",
  "extras": {
    "conversation_uuid": "abc",
    "client::notification": {
      "click": { "url": "https://gooyal.ir/orders/123" }
    }
  }
}
```

### Migration

`apps/push_notifications/migrations/0004_pushmessage_click_url.py` — adds
`click_url` to `pushmessage`. Applied cleanly against the local Postgres
container.

### Verified

| Check | Result |
|---|---|
| Migration applied to live local Postgres | ✅ applied clean |
| `get_gotify_extras()`: click_url only | ✅ merges correctly |
| `get_gotify_extras()`: click_url + pre-existing custom extras | ✅ both keys coexist |
| `get_gotify_extras()`: no click_url set | ✅ extras left untouched |
| Live round trip against local Gotify 2.6.3 container | ✅ accepted & echoed back correctly |
| Bulk path: mocked spreadsheet rows with/without a click_url cell | ✅ parses correctly, incl. the extras_str fix |
| Serializer optionality (`required=False`, `allow_null=True`, `allow_blank=True`) | ✅ confirmed |

## 3. Producer services updated to pass `click_url` through

Each of the three services that call into this notifications service vendors
its own thin wrapper around the generated client. Added an optional
`click_url=None` parameter to each wrapper so producers can opt in without
being forced to — no existing call site was changed, so this is fully
backward compatible.

Workflow used in every repo: `git checkout master` → `git pull origin
master` → `git checkout -b feature/notification-client-update` → edit.

| Service | Branch | File changed | Function | Tests |
|---|---|---|---|---|
| **chat** | `feature/notification-client-update` | `utils/clients/notifications_client.py` | `push_user()` / `_PushBody` | 47/47 passed (`pytest`) |
| **promotions** | `feature/notification-client-update` | `utils/clients/notifications_client.py` | `notifications_push_user()` | no existing test suite for this file |
| **advertising** | `feature/notification-client-update` | `utils/clients/notifications_client.py` | `notifications_push_user()` | `apps.campaigns`/`apps.stores` suites: same failures with and without the change (pre-existing, tied to a real staging OAuth call returning `invalid_scope` — unrelated to this edit) |

None of these commits were made — changes are sitting on each repo's
`feature/notification-client-update` branch, uncommitted, pending your
review.

**Not done, and out of scope for this pass:** wiring an actual `click_url`
value into chat's message-push call site, promotions' or advertising's push
calls. Which notifications should be clickable, and where they should
navigate, is a product decision for each feature — this pass only makes the
plumbing available.

## 4. Chat service: notification implementation review

- **Location**: `apps/chat/events/publishers/push.py`, `PushPublisher.publish()`.
  Pushes every recipient in a conversation (except the sender) on
  `MessageSentEvent`, with `extras={"conversation_uuid": ..., "post_id": ...}`.
  Per-recipient failures are caught and logged, not raised — one broken
  recipient doesn't block the rest.
- **Is it in master?** Yes. Commit `0d262c6` ("Send push notifications on new
  chat messages") is on `master`, and local `master` matches
  `origin/master` exactly (`9f8b723f...`). Nothing related is stuck on an
  unmerged feature branch — `feature/notification` is a stale, unrelated
  branch (conversation-details work), not the source of this feature.
- **Does it work?** `python -m pytest apps/chat/tests/test_push_publisher.py`
  → **4/4 passed**. Full suite (`pytest`) → **47/47 passed**.
  `python manage.py check` → no issues.
- **One local-only gap found**: `NOTIFICATIONS_BASE_PUBLIC_URL` is not set in
  the local dev `.env` (it defaults to `None` in `main/settings.py:277`),
  even though `.env.example`/`env.sample` both document it
  (`https://notifications-staging.gooyal.ir`). Pushes would fail locally
  until that's added — this looks like an omission in the local `.env`, not
  a code issue. Left as-is since it's your local working file.

## 5. What's left, outside this repo

1. **Producer call sites don't pass `click_url` yet.** The plumbing exists
   (§3); deciding which notifications should be clickable and what URL each
   should carry is a per-feature product decision.
2. **The receiving client needs a tap handler.** Checked every sibling
   Gooyal repo in this workspace (`reservation-front`, `winofy-backend`,
   `crm_backend`, etc.) — none of them handle Gotify push display or taps,
   so the actual mobile/web app isn't in this workspace. Can't confirm
   whether it already has a handler for chat's `conversation_uuid`/`post_id`
   keys that could be extended, or has none at all.