# Environment / runtime requirements

The software stack and server environment required to run XAMXAM. This is the
machine-facing counterpart to the original product spec (fiche technique,
archived at [`spec-sheet.md`](archive/spec-sheet.md)).

## Production server (`xamxam`)

| Item | Value |
|------|-------|
| **OS** | Debian 13 (trixie), `x86_64` |
| **Web server** | nginx 1.26 (config: `nginx/xamxam.conf`) |
| **PHP** | PHP-FPM 8.4 (pool `www`, master config `/etc/php/8.4/fpm/`) |
| **Database** | SQLite 3 (WAL mode), `/var/www/xamxam/storage/xamxam.db` |
| **App root** | `/var/www/xamxam/` (DocumentRoot → `app/public/`) |
| **App user** | `www-data`, group `xamxam` |
| **Node.js** | *Not required on the server* — assets are built locally and rsync'd |

## PHP (≥ 8.4)

Declared in `composer.json` (`"php": ">=8.4"`, platform lock `8.4`).

### Required extensions (`composer.json` `require`)

- `ext-json`
- `ext-openssl`
- `ext-pdo`

### Implicitly required (used by the code or transitive deps)

Verified present in the production `php -m` output and on the FPM pool:

- `pdo_sqlite` / `sqlite3` — the primary datastore
- `curl` — PeerTube/Nextcloud/HTTP integrations (Guzzle uses it)
- `mbstring` / `iconv` / `intl` — string handling, Markdown, translations
- `session` — admin auth + CSRF (see [`security.md`](security.md))
- `sodium` — `Crypto` (libsodium) for encrypted fields (SMTP password)
- `zlib` / `phar` — Composer autoload + PHAR-based tooling
- `gd` — not used directly, present transitively (image handling is `finfo`)
- `fileinfo` — upload MIME validation (`finfo`)
- `calendar`, `ctype`, `filter`, `hash`, `tokenizer`, `xml`, `libxml` — PHP core
  extensions, present by default

### Recommended (production)

- `opcache` (+ `opcache.preload` optional) — bytecode cache
- `xdebug` — **disabled/not loaded in production** (dev only)

### PHP — other runtime settings

- **Session GC** — tuned in `/etc/php/8.4/fpm/conf.d/zz-xamxam-session.ini` (see
  [`security.md`](security.md#php-fpm-session-gc-configuration)): `gc_maxlifetime = 43200`,
  `gc_probability = 1`, `gc_divisor = 100`. Must stay ≥ the app's
  `ABSOLUTE_TIMEOUT_SECONDS` (12 h).
- **Upload limits** — storage partition temp dir at
  `/var/www/xamxam/storage/tmp/php-uploads/` (not `/tmp` tmpfs); see
  [`file-uploads.md`](file-uploads.md).
- **Logs** — Monolog writes to `/var/log/xamxam/` (provisioned by the deploy
  script).

## Composer dependencies

From `composer.json`:

| Package | Purpose |
|---------|---------|
| `guzzlehttp/guzzle` `^7.9` | HTTP client (PeerTube, Nextcloud, integrations) |
| `league/commonmark` `^2.4` | Markdown rendering (pages, help blocks) |
| `monolog/monolog` `^3.10` | Logging |
| `phpmailer/phpmailer` `^6.9` | SMTP (STARTTLS/SMTPS/plain) |

Dev-only: `phpunit/phpunit ^11`, `phpstan/phpstan ^2.1`,
`friendsofphp/php-cs-fixer ^3.95`, `symfony/polyfill-iconv ^1.31`.

## Node.js / npm (build-time only)

Used **locally** to build frontend assets — not needed on the production server.
Build tooling is pinned in `package.json` `devDependencies`:

| Package | Purpose |
|---------|---------|
| `rolldown` | JS bundling |
| `lightningcss` | CSS minification |
| `@biomejs/biome` | lint/format |
| `chokidar-cli` | dev watch mode |

Run `npm ci` (not `npm install`) to install; `npm run build` (or `just build`)
to produce `app/public/assets/`.

## nginx

- Config source: `nginx/xamxam.conf`; installed to
  `/etc/nginx/sites-available/xamxam` (symlinked from `sites-enabled/`).
- PHP handled via `fastcgi_pass` to the `php8.4-fpm` pool `www`.
- Security headers enforced here (HSTS, CSP, etc.) — see
  [`security.md`](security.md) and `nginx/docs/SECURITY_HEADERS.md`.
- Static assets served from `app/public/`; `/storage`, `/src`, `/templates`,
  DB/env hidden files are blocked.

## Database

- SQLite 3 file DB (`app/storage/xamxam.db`) in **WAL mode**.
- Schema + migrations: `app/src/DatabaseMigrations.php`; see
  [`database.md`](database.md).
- Backups: WAL-safe `sqlite3 .backup` (see [`deployment.md`](deployment.md)).
- `sqlite3` CLI required on the server for backup/query helpers.

## Toolchain / CLI

Required on the **dev** machine (and `just` on deploy-from-local):

- **PHP** ≥ 8.4 (same extensions as above, plus `sqlite3` for local DB)
- **Composer** 2.x
- **Node.js + npm** (for the JS build)
- **`just`** (command runner; see justfile)
- **`ssh`** access to `xamxam` for `just deploy*`

## See also

- [`development.md`](development.md) — local dev workflow, structure, builds
- [`deployment.md`](deployment.md) — server setup, deploy, backups, rollback
- [`security.md`](security.md) — security posture, session GC tuning