# Languard Server Manager — API Contract

## Base URL
```
http://localhost:8000/api
```

## Authentication
- All endpoints except `POST /auth/login` require: `Authorization: Bearer <JWT>`
- WebSocket: pass token as query param: `ws://localhost:8000/ws/{server_id}?token=<JWT>`
- JWT payload: `{ "sub": "user_id", "username": "string", "role": "admin|viewer", "exp": timestamp }`

## Common Response Envelope
```json
{
  "success": true,
  "data": { ... },
  "error": null
}
```
Error response:
```json
{
  "success": false,
  "data": null,
  "error": {
    "code": "NOT_FOUND",
    "message": "Server with id 5 not found"
  }
}
```

## HTTP Status Codes
| Code | Meaning |
|------|---------|
| 200 | Success |
| 201 | Created |
| 204 | No content (DELETE) |
| 400 | Validation error |
| 401 | Unauthenticated |
| 403 | Forbidden (insufficient role) |
| 404 | Not found |
| 409 | Conflict (already running, duplicate) |
| 422 | Unprocessable (Pydantic validation) |
| 500 | Internal server error |

---

## Auth Endpoints

### POST /auth/login
Login and receive JWT.

**Request:**
```json
{
  "username": "admin",
  "password": "secret"
}
```
**Response 200:**
```json
{
  "success": true,
  "data": {
    "access_token": "eyJhbGciOiJIUzI1NiIs...",
    "token_type": "bearer",
    "expires_in": 86400,
    "user": {
      "id": 1,
      "username": "admin",
      "role": "admin"
    }
  }
}
```

### POST /auth/logout
Invalidate token (client-side token deletion; server-side blacklist optional).

### GET /auth/me
Return current user info.

### PUT /auth/password
Change password. Admin only.
```json
{ "current_password": "old", "new_password": "new" }
```

### GET /auth/users
List all users. Admin only.

### POST /auth/users
Create user. Admin only.
```json
{ "username": "viewer1", "password": "pass", "role": "viewer" }
```

### DELETE /auth/users/{user_id}
Delete user. Admin only.

---

## Server Endpoints

### GET /servers
List all servers with current status. Supports pagination.

**Query params:** `?limit=50&offset=0`

**Response 200:**
```json
{
  "success": true,
  "data": [
    {
      "id": 1,
      "name": "Main Server",
      "description": "Primary COOP server",
      "status": "running",
      "pid": 12345,
      "game_port": 2302,
      "rcon_port": 2306,
      "player_count": 15,
      "max_players": 40,
      "current_mission": "MyMission.Altis",
      "uptime_seconds": 3600,
      "cpu_percent": 34.2,
      "ram_mb": 1850.5,
      "started_at": "2026-04-16T10:00:00Z"
      // current_mission: computed from RCon 'players' response or mission_rotation + server status
      // uptime_seconds: computed as (now - started_at) in the service layer
    }
  ]
}
```

### POST /servers
Create a new server. Admin only.

**Request:**
```json
{
  "name": "Main Server",
  "description": "Primary COOP server",
  "exe_path": "C:/Arma3Server/arma3server_x64.exe",
  "game_port": 2302,
  "rcon_port": 2306,
  "auto_restart": true,
  "max_restarts": 3
}
```
**Note:** `password_admin` is auto-generated if not provided in the request. The generated value is returned in the response (shown once — not stored in plaintext API responses after creation). `rcon_password` is also auto-generated if not provided.
**Response 201:** Returns full server object including auto-generated credentials.

### GET /servers/{server_id}
Get server detail with full status.

**Response 200:**
```json
{
  "success": true,
  "data": {
    "id": 1,
    "name": "Main Server",
    "status": "running",
    "pid": 12345,
    "game_port": 2302,
    "rcon_port": 2306,
    "auto_restart": true,
    "restart_count": 0,
    "player_count": 15,
    "max_players": 40,
    "cpu_percent": 34.2,
    "ram_mb": 1850.5,
    "started_at": "2026-04-16T10:00:00Z",
    "uptime_seconds": 3600,
    "current_mission": "MyMission.Altis"
  }
}
```

### PUT /servers/{server_id}
Update server metadata (name, description, exe_path, ports). Admin only.

### DELETE /servers/{server_id}
Delete server (must be stopped first). Admin only. Removes DB rows and `servers/{id}/` directory.

### POST /servers/{server_id}/start
Start the server. Admin only.

**Response 200:**
```json
{ "success": true, "data": { "status": "starting", "pid": null } }
```
**Response 409:** Server already running.

### POST /servers/{server_id}/stop
Graceful stop (send `#shutdown` via RCon, then kill after 30s). Admin only.

**Request (optional):**
```json
{ "force": false, "reason": "Maintenance" }
```

### POST /servers/{server_id}/restart
Stop then start. Admin only.

### POST /servers/{server_id}/kill
Force-kill the process immediately. Admin only. Emergency use only.

---

## Server Config Endpoints

### GET /servers/{server_id}/config
Get all config sections combined.

**Response 200:**
```json
{
  "success": true,
  "data": {
    "server": { /* server_configs row */ },
    "basic": { /* basic_configs row */ },
    "profile": { /* server_profiles row */ },
    "launch": { /* launch_params row */ },
    "rcon": { "rcon_password": "***", "max_ping": 200, "enabled": true }
  }
}
```

### PUT /servers/{server_id}/config/server
Update server.cfg settings. Admin only.

**Request:** Partial object matching `server_configs` columns (snake_case). Any omitted field keeps current value.

```json
{
  "hostname": "Updated Server Name",
  "max_players": 64,
  "battleye": 1,
  "verify_signatures": 2,
  "motd_lines": ["Welcome!", "Have fun"],
  "motd_interval": 5.0
}
```

### PUT /servers/{server_id}/config/basic
Update basic.cfg (bandwidth) settings. Admin only.

```json
{
  "max_bandwidth": 50000000,
  "max_msg_send": 256
}
```

### PUT /servers/{server_id}/config/profile
Update difficulty profile. Admin only.

```json
{
  "third_person_view": 0,
  "weapon_crosshair": 0,
  "ai_level_preset": 3,
  "skill_ai": 0.7,
  "precision_ai": 0.6
}
```

### PUT /servers/{server_id}/config/launch
Update launch parameters. Admin only.

```json
{
  "world": "empty",
  "limit_fps": 50,
  "auto_init": false,
  "load_mission_to_memory": true,
  "bandwidth_alg": 2,
  "enable_ht": true,
  "huge_pages": false
}
```

### PUT /servers/{server_id}/config/rcon
Update BattlEye RCon settings. Admin only.
Regenerates `battleye/beserver.cfg` immediately. **Note:** BattlEye reads beserver.cfg only at server startup — RCon config changes require a server restart to take effect. The updated config file is ready for the next start.

**Note on `rcon_port`:** This field is stored in the `servers` table (not `rcon_configs`).
The service layer updates both tables as needed. Include only fields you want to change.

```json
{
  "rcon_password": "newpassword",
  "rcon_port": 2306,
  "max_ping": 300,
  "enabled": true
}
```

### GET /servers/{server_id}/config/preview
Returns rendered `server.cfg` as plain text string (for preview in UI). **Admin only** — contains plaintext credentials.

**Response 200:** `Content-Type: text/plain`

### GET /servers/{server_id}/config/download/{filename}
Download generated config file. Filename must be one of: `server.cfg` | `basic.cfg` | `server.Arma3Profile` (whitelist-validated, no path traversal). **Admin only** — config files contain plaintext passwords.

---

## Mission Endpoints

### GET /servers/{server_id}/missions
List all mission PBOs for a server.

**Response 200:**
```json
{
  "success": true,
  "data": [
    {
      "id": 1,
      "filename": "MyMission.Altis.pbo",
      "mission_name": "MyMission.Altis",
      "terrain": "Altis",
      "file_size": 102400,
      "uploaded_at": "2026-04-16T09:00:00Z"
    }
  ]
}
```

### POST /servers/{server_id}/missions/upload
Upload a mission PBO. Admin only. `multipart/form-data`.

**Form fields:**
- `file`: the `.pbo` file (filename is sanitized with `os.path.basename()` to prevent path traversal; only `.pbo` extension allowed)

**Response 201:**
```json
{
  "success": true,
  "data": {
    "id": 2,
    "filename": "NewMission.Stratis.pbo",
    "mission_name": "NewMission.Stratis",
    "terrain": "Stratis",
    "file_size": 51200
  }
}
```

### DELETE /servers/{server_id}/missions/{mission_id}
Delete a mission PBO (removes file from disk). Admin only.

### GET /servers/{server_id}/missions/rotation
Get current mission rotation (ordered list).

**Response 200:**
```json
{
  "success": true,
  "data": [
    {
      "id": 1,
      "sort_order": 0,
      "mission": { "id": 1, "mission_name": "MyMission.Altis" },
      "difficulty": "Regular",
      "params": { "RespawnDelay": 15 }
    }
  ]
}
```

### PUT /servers/{server_id}/missions/rotation
Replace the entire mission rotation. Admin only.

```json
{
  "rotation": [
    { "mission_id": 1, "difficulty": "Regular", "params": {} },
    { "mission_id": 2, "difficulty": "Veteran", "params": { "RespawnDelay": 30 } }
  ]
}
```

---

## Mod Endpoints

### GET /mods
List all registered mods (global list).

### POST /mods
Register a mod folder. Admin only.

```json
{
  "name": "@CBA_A3",
  "folder_path": "C:/Arma3Server/@CBA_A3",
  "workshop_id": "450814997",
  "description": "Community Base Addons"
}
```

### DELETE /mods/{mod_id}
Delete mod registration. Admin only.

### GET /servers/{server_id}/mods
Get mods enabled for a server.

**Response 200:**
```json
{
  "success": true,
  "data": [
    {
      "mod_id": 1,
      "name": "@CBA_A3",
      "folder_path": "C:/Arma3Server/@CBA_A3",
      "is_server_mod": false,
      "sort_order": 0
    }
  ]
}
```

### PUT /servers/{server_id}/mods
Replace the mod list for a server. Admin only.

```json
{
  "mods": [
    { "mod_id": 1, "is_server_mod": false, "sort_order": 0 },
    { "mod_id": 2, "is_server_mod": true,  "sort_order": 1 }
  ]
}
```

---

## Player Endpoints

### GET /servers/{server_id}/players
Get currently connected players.

**Response 200:**
```json
{
  "success": true,
  "data": [
    {
      "player_num": 1,
      "name": "PlayerOne",
      "guid": "abc123...",
      "ping": 45,
      "verified": true,
      "joined_at": "2026-04-16T10:15:00Z"
    }
  ]
}
```

### POST /servers/{server_id}/players/{player_num}/kick
Kick a player via RCon. Admin only.

```json
{ "reason": "AFK" }
```

### POST /servers/{server_id}/players/{player_num}/ban
Ban a player via RCon. Admin only.

```json
{
  "reason": "Griefing",
  "duration_minutes": 0
}
```

### GET /servers/{server_id}/players/history
Player connection history. Supports pagination.

**Query params:** `?limit=50&offset=0&search=PlayerName`

---

## Ban Endpoints

### GET /servers/{server_id}/bans
List all bans for a server.

**Query params:** `?active_only=true&limit=50&offset=0`

### POST /servers/{server_id}/bans
Add ban manually. Admin only.

```json
{
  "guid": "abc123...",
  "steam_uid": "76561198...",
  "name": "PlayerName",
  "reason": "Cheating",
  "duration_minutes": 0
}
```

### DELETE /servers/{server_id}/bans/{ban_id}
Remove a ban. Admin only.

---

## Log Endpoints

### GET /servers/{server_id}/logs
Query stored log lines.

**Query params:** `?limit=200&offset=0&level=error&since=2026-04-16T10:00:00Z&search=BattlEye`

**Response 200:**
```json
{
  "success": true,
  "data": {
    "total": 1542,
    "logs": [
      {
        "id": 100,
        "timestamp": "2026-04-16T10:05:23Z",
        "level": "info",
        "message": "Player PlayerOne connected"
      }
    ]
  }
}
```

### DELETE /servers/{server_id}/logs
Clear all stored log lines for a server. Admin only.

---

## Metrics Endpoints

### GET /servers/{server_id}/metrics
Get time-series metrics.

**Query params:** `?from=2026-04-16T00:00:00Z&to=2026-04-16T23:59:59Z&resolution=5m`

**Response 200:**
```json
{
  "success": true,
  "data": [
    {
      "timestamp": "2026-04-16T10:00:00Z",
      "cpu_percent": 34.2,
      "ram_mb": 1850.5,
      "player_count": 15
    }
  ]
}
```

---

## RCon Endpoints

### POST /servers/{server_id}/rcon/command
Send raw RCon/admin command. Admin only.

```json
{ "command": "#restart" }
```

**Available commands:**
- `#restart` — Restart mission
- `#reassign` — Restart with roles unassigned
- `#missions` — Open mission selection
- `#lock` / `#unlock` — Lock/unlock server
- `#mission NAME.TERRAIN [difficulty]` — Load specific mission
- `#shutdown` — Shut down server
- `#monitor N` — Toggle performance monitoring
- `say -1 MESSAGE` — Message all players

### POST /servers/{server_id}/rcon/say
Broadcast a message to all players. Admin only.

```json
{ "message": "Server restarting in 5 minutes!" }
```

---

## Event Log Endpoints

### GET /servers/{server_id}/events
Get server event history (audit trail).

**Query params:** `?limit=50&offset=0&event_type=crashed`

---

## System Endpoints

### GET /system/status
Overall system status. **Requires authentication** (admin or viewer).

```json
{
  "success": true,
  "data": {
    "version": "1.0.0",
    "running_servers": 2,
    "total_servers": 3,
    "uptime_seconds": 86400
  }
}
```

### GET /system/health
Health check (for load balancer/Docker). Returns 200 if healthy.

---

## WebSocket API

### Connection
```
ws://localhost:8000/ws/{server_id}?token=<JWT>
```
Use `server_id = "all"` to subscribe to events from all servers.

### Client → Server Messages

```json
{ "type": "ping" }
{ "type": "subscribe", "channels": ["logs", "players", "metrics", "status"] }
{ "type": "unsubscribe", "channels": ["metrics"] }
```

**Channel subscription**: The `ConnectionManager` tracks per-connection channel subscriptions. Only messages matching subscribed channels are delivered. Default subscriptions on connect: `["status"]`.

**Channel names match message types exactly:** `status`, `log`, `players`, `metrics`, `event`. Subscribe with channel names matching the `type` field in server→client messages.

### Server → Client Messages

#### Status Update
Sent when server status changes (starting → running → stopped, etc.)
```json
{
  "type": "status",
  "server_id": 1,
  "data": {
    "status": "running",
    "pid": 12345,
    "started_at": "2026-04-16T10:00:00Z"
  }
}
```

#### Log Line
Sent for each new RPT log line.
```json
{
  "type": "log",
  "server_id": 1,
  "data": {
    "timestamp": "2026-04-16T10:05:23Z",
    "level": "info",
    "message": "BattlEye Server: Initialized (v1.240)"
  }
}
```

#### Player List Update
Sent after each RCon poll (every 10s).
```json
{
  "type": "players",
  "server_id": 1,
  "data": {
    "players": [
      { "player_num": 1, "name": "PlayerOne", "ping": 45, "verified": true }
    ],
    "count": 1
  }
}
```

#### Metrics Update
Sent every 5 seconds.
```json
{
  "type": "metrics",
  "server_id": 1,
  "data": {
    "cpu_percent": 34.2,
    "ram_mb": 1850.5,
    "player_count": 1,
    "timestamp": "2026-04-16T10:05:25Z"
  }
}
```

#### Server Event
Sent for significant events (crash, restart, etc.)
```json
{
  "type": "event",
  "server_id": 1,
  "data": {
    "event_type": "crashed",
    "detail": { "exit_code": 1 },
    "timestamp": "2026-04-16T10:30:00Z"
  }
}
```

#### Pong
```json
{ "type": "pong" }
```

---

## Rate Limiting

- `POST /auth/login`: 5 attempts per minute per IP. Exceeded returns `429 Too Many Requests`.
- All other endpoints: 60 requests per minute per token. Exceeded returns `429`.
- Implemented via FastAPI middleware (e.g., `slowapi`).

---

## Error Codes Reference

| Code | Description |
|------|-------------|
| `UNAUTHORIZED` | Missing or invalid token |
| `FORBIDDEN` | Role insufficient |
| `NOT_FOUND` | Resource not found |
| `SERVER_ALREADY_RUNNING` | Start called on running server |
| `SERVER_NOT_RUNNING` | Stop/command on stopped server |
| `RCON_UNAVAILABLE` | RCon connection failed |
| `INVALID_CONFIG` | Config validation failed |
| `EXE_NOT_FOUND` | arma3server.exe not at configured path |
| `PORT_IN_USE` | Game port already occupied |
| `UPLOAD_FAILED` | Mission file upload error |
| `VALIDATION_ERROR` | Pydantic validation failure |
| `INTERNAL_ERROR` | Unexpected server error |
| `MOD_IN_USE` | Cannot delete mod — enabled on one or more servers |
| `MISSION_IN_ROTATION` | Cannot delete mission — in active rotation |
| `RATE_LIMITED` | Too many requests |