# spasteg

A secure, self-hostable "burn after reading" paste service with ephemeral storage written in [Gleam](https://gleam.run).

## Features

- Deletes pastes after they are viewed
- Data is stored only in memory
- No user accounts needed
- Easy to run yourself
- Fast and reliable
- Written in Gleam (type-safe)

## Architecture

- Gleam: Type-safe language built upon the BEAM
- Web: Wisp framework + Mist HTTP server
- Frontend: Lustre for HTML rendering
- Storage: In-memory only (no persistence)
- Security: AES-256-GCM client-side encryption, CSRF tokens, rate limiting, security headers

## Configuration

### SECRET_KEY_BASE (Required for Production)

The application uses a secret key base for signing cookies and security tokens.

You **must** set this for production deployments to ensure security and session persistence across restarts.

```bash
# Generate a secure key (48 bytes of random data)
export SECRET_KEY_BASE=$(openssl rand -base64 48)

# Or set it manually
export SECRET_KEY_BASE="your-secret-key-here"
```

**⚠️ Warning**: If not set, a temporary key will be generated on each startup. This:

- Invalidates all existing user sessions/cookies after restart
- Reduces security (new key generated each time)
- Generates a warning in the logs

For development, you can use:

```bash
SECRET_KEY_BASE=dev gleam run
```

## Quick Start

```bash
# Clone and build
git clone https://git.kharec.info/Kharec/spasteg.git
cd spasteg
gleam run
```

The server starts on `http://localhost:3000`.

## Docker image+deployment

### Build

```bash
docker build -t spasteg .
```

### Run

```bash
# Generate a secure key
docker run -p 3000:3000 -e SECRET_KEY_BASE=$(openssl rand -base64 48) spasteg
```

**With custom port:**

```bash
docker run -p 8080:3000 -e SECRET_KEY_BASE=$(openssl rand -base64 48) -e PORT=3000 spasteg
```

The container exposes port 3000 and runs as a non-root user with a health check configured.

## Usage

1. Visit `http://localhost:3000`
2. Enter your text in the form
3. Click "Create Paste"
4. Share the generated URL
5. The paste auto-destructs after first access

Note: the creator cannot see their post with the copied link (except in private browsing) - it would be burned immediately.

## License

This project is licensed under the GNU General Public License v3.0 or later (GPLv3+). See the [LICENSE](LICENSE) file for details.