# Dashback API

Backend API for the Dashback frontend. Default base URL:

```
http://localhost:4208/api
```

## CORS & cookies

All browser requests that need auth must send cookies:

```js
fetch('http://localhost:4208/api/auth/me', {
  credentials: 'include',
});
```

Sessions use an HTTP-only `token` cookie (`Secure`, `SameSite=Strict`, 24h). The browser must talk to the API over **HTTPS** for login to work — `Secure` cookies are not sent on plain HTTP.

## Auth flow

1. Call `GET /auth/me` to get `googleClientId` (included in 200 and 401 responses).
2. Sign in with Google on the frontend (Google Identity Services / One Tap).
3. POST the Google ID token to the API.
4. The API sets the session cookie.
5. Call protected routes with `credentials: 'include'`. The cookie is refreshed automatically when it has less than 2 hours left.

### `POST /auth/login`

Public. No cookie required.

**Body (JSON)**

```json
{ "idToken": "<google-id-token>" }
```

**200**

```json
{
  "message": "Login successful",
  "user": { "id": 1, "email": "you@example.com", "picture": "https://lh3.googleusercontent.com/..." }
}
```

**Errors**

| Status | Body |
|--------|------|
| 400 | `{ "error": "idToken is required" }` |
| 401 | `{ "error": "Invalid Google token" }` or `{ "error": "Invalid Google account" }` |
| 403 | `{ "error": "Email is not authorized" }` |

### `POST /auth/logout`

Public. Clears the session cookie.

**200**

```json
{ "message": "Logged out successfully" }
```

### `GET /auth/me`

Protected. Requires a valid session cookie. Every response includes `googleClientId`.

**200**

```json
{
  "user": { "id": 1, "email": "you@example.com", "picture": "https://lh3.googleusercontent.com/..." },
  "googleClientId": "your-client-id.apps.googleusercontent.com"
}
```

**Errors**

| Status | Body |
|--------|------|
| 401 | `{ "error": "Unauthorized", "googleClientId": "..." }` or `{ "error": "Invalid token", "googleClientId": "..." }` |
| 403 | `{ "error": "User is no longer authorized", "googleClientId": "..." }` |

## Frontend checklist

- [ ] `credentials: 'include'` on every API call
- [ ] HTTPS in dev (or proxy) so `Secure` cookies work