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# SMSGate Server

This server acts as the backend component of the [SMSGate](https://github.com/capcom6/android-sms-gateway), facilitating the sending of SMS messages through connected Android devices. It includes a RESTful API for message management, integration with Firebase Cloud Messaging (FCM), and a database for persistent storage.

## Table of Contents

- [SMSGate Server](#smsgate-server)
  - [Table of Contents](#table-of-contents)
  - [Features](#features)
  - [Prerequisites](#prerequisites)
  - [Quickstart](#quickstart)
  - [Work modes](#work-modes)
  - [JWT Authentication](#jwt-authentication)
    - [Configuration](#configuration)
    - [Token Management](#token-management)
      - [Generate Token Pair](#generate-token-pair)
      - [Refresh Access Token](#refresh-access-token)
      - [Revoke Token](#revoke-token)
    - [Using JWT Tokens](#using-jwt-tokens)
    - [Available Scopes](#available-scopes)
  - [Contributing](#contributing)
  - [License](#license)
  - [Legal Notice](#legal-notice)

## Features

- **SMS Messaging**: Dispatch SMS and data messages through a RESTful API.
- **Message Status**: Retrieve status for sent messages.
- **Device Management**: View information about connected Android devices.
- **Webhooks**: Configure webhooks for event-driven notifications.
- **Health Monitoring**: Access health check endpoints to ensure system integrity.
- **Access Control**: Operate in either public mode for open access or private mode for restricted access.
- **Data SMS Support**: Send/receive binary payloads via SMS with Base64 encoding and port-based routing.
- **JWT Authentication**: Secure API access with JSON Web Tokens, including access and refresh token support for enhanced security.

## Prerequisites

- Go (for development and testing purposes)
- Docker and Docker Compose (for Docker-based setup)
- A configured MySQL/MariaDB database

## Quickstart

The easiest way to get started with the server is to use the Docker-based setup in Private Mode. In this mode device registration endpoint is protected, so no one can register a new device without knowing the token.

1. Set up MySQL or MariaDB database.
2. Create config.yml, based on [config.example.yml](configs/config.example.yml). The most important sections are `database`, `http` and `gateway`. Environment variables can be used to override values in the config file.
    1. In `gateway.mode` section set `private`.
    2. In `gateway.private_token` section set the access token for device registration in private mode. This token must be set on devices with private mode active.
    3. In `gateway.upstream_url` section set the upstream server base URL used for private-mode push notifications. (default: `https://api.sms-gate.app/upstream/v1`).
    4. (Optional) In `jwt` section configure JWT authentication:
       - Set `secret` to a secure random string (minimum 32 characters)
       - Configure `access_ttl` (default: 15m) and `refresh_ttl` (default: 720h)
       - Set `issuer` to identify your server
3. Start the server in Docker: `docker run -p 3000:3000 -v ./config.yml:/app/config.yml capcom6/sms-gateway:latest`.
4. Set up private mode on devices.
5. Use started private server with the same API as the public server at [api.sms-gate.app](https://api.sms-gate.app).

See also [docker-compose.yml](deployments/docker-compose/docker-compose.yml) for Docker-based setup.

## Work modes

The server has two work modes: public and private. The public mode allows anonymous device registration and used at [api.sms-gate.app](https://api.sms-gate.app). Private mode can be used to send sensitive messages and running server in local infrastructure.

In most operations public and private modes are the same. But there are some differences:

- `POST /api/mobile/v1/device` endpoint is protected by API key in private mode. So it is not possible to register a new device on private server without knowing the token.
- FCM notifications from private server are sent through `api.sms-gate.app`. Notifications don't contain any sensitive data like phone numbers or message text.

See also [private mode discussion](https://github.com/capcom6/android-sms-gateway/issues/20).

## JWT Authentication

The server supports JWT (JSON Web Token) authentication for secure API access. When enabled, you can generate access tokens with specific scopes and refresh them without re-authenticating.

### Configuration

To enable JWT authentication, configure the `jwt` section in your [`config.yml`](configs/config.example.yml):

```yaml
jwt:
  secret: your-secure-secret-key-minimum-32-characters  # Required, minimum 32 characters
  access_ttl: 15m                                       # Access token time-to-live (default: 15m)
  refresh_ttl: 720h                                     # Refresh token time-to-live (default: 720h)
  issuer: your-server-name                              # Optional issuer identifier
```

**Important**: The `secret` must be at least 32 characters long. The `refresh_ttl` must be greater than `access_ttl`.

### Token Management

#### Generate Token Pair

Generate an access token and refresh token using Basic authentication:

```http
POST /api/3rdparty/v1/auth/token HTTP/1.1
Authorization: Basic <base64-encoded-credentials>
Content-Type: application/json

{
    "ttl": 3600,
    "scopes": [
        "messages:send",
        "messages:read",
        "devices:list",
        "devices:delete",
        "webhooks:list",
        "webhooks:write",
        "settings:read",
        "settings:write",
        "logs:read"
    ]
}
```

Response:
```json
{
    "id": "token-jti",
    "token_type": "Bearer",
    "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
    "refresh_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
    "expires_at": "2026-03-12T02:00:00Z"
}
```

#### Refresh Access Token

Use the refresh token to obtain a new access token:

```http
POST /api/3rdparty/v1/auth/token/refresh HTTP/1.1
Authorization: Bearer <refresh_token>
```

#### Revoke Token

Revoke a specific token by its JTI (JWT ID):

```http
DELETE /api/3rdparty/v1/auth/token/<jti> HTTP/1.1
Authorization: Basic <base64-encoded-credentials>
```

### Using JWT Tokens

Once you have an access token, use it in the `Authorization` header:

```http
GET /api/3rdparty/v1/messages HTTP/1.1
Authorization: Bearer <access_token>
```

### Available Scopes

The following scopes are available for token generation:

- `messages:send` - Send SMS messages
- `messages:read` - Read individual messages
- `messages:list` - List messages
- `messages:export` - Export messages
- `devices:list` - List connected devices
- `devices:delete` - Delete devices
- `webhooks:list` - List webhooks
- `webhooks:write` - Create and update webhooks
- `webhooks:delete` - Delete webhooks
- `settings:read` - Read server settings
- `settings:write` - Modify server settings
- `logs:read` - Read server logs
- `tokens:manage` - Generate and revoke tokens

## Contributing

Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are **greatly appreciated**.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement".
Don't forget to give the project a star! Thanks again!

1. Fork the Project
2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
3. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
4. Push to the Branch (`git push origin feature/AmazingFeature`)
5. Open a Pull Request

## License

Distributed under the Apache-2.0 license. See [LICENSE](LICENSE) for more information.

## Legal Notice

Android is a trademark of Google LLC.

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