98 lines
2.7 KiB
Markdown
98 lines
2.7 KiB
Markdown
# spasteg
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A secure, self-hostable "burn after reading" paste service with ephemeral storage written in [Gleam](https://gleam.run).
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## Features
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- Deletes pastes after they are viewed
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- Data is stored only in memory
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- No user accounts needed
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- Easy to run yourself
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- Fast and reliable
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- Written in Gleam (type-safe)
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## Flowchart
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```mermaid
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graph TD
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A[User creates paste] --> B[Paste is stored in memory]
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B --> C[Paste is deleted after first view]
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C --> D[User shares paste URL]
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D --> E[User views paste]
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E --> F[Paste is deleted]
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```
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Note: the creator can now see their post (except in private browsing) - it would be burned immediately.
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## Configuration
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### SECRET_KEY_BASE (Required for Production)
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The application uses a secret key base for signing cookies and security tokens.
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You **must** set this for production deployments to ensure security and session persistence across restarts.
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```bash
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# Generate a secure key (48 bytes of random data)
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export SECRET_KEY_BASE=$(openssl rand -base64 48)
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# Or set it manually
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export SECRET_KEY_BASE="your-secret-key-here"
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```
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**⚠️ Warning**: If not set, a temporary key will be generated on each startup. This:
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- Invalidates all existing user sessions/cookies after restart
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- Reduces security (new key generated each time)
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- Generates a warning in the logs
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For development, you can use:
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```bash
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SECRET_KEY_BASE=dev gleam run
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```
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## Quick Start
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```bash
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# Clone and build
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git clone https://git.kharec.info/Kharec/spasteg.git
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cd spasteg
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gleam run
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```
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The server starts on `http://localhost:3000`.
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## Usage
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1. Visit `http://localhost:3000`
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2. Enter your text in the form
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3. Click "Create Paste"
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4. Share the generated URL
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5. The paste auto-destructs after first access
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## Architecture
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- **Gleam**: Type-safe language built upon the BEAM
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- **Web**: Wisp framework + Mist HTTP server
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- **Frontend**: Lustre for HTML rendering
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- **Storage**: In-memory only (no persistence)
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- **Security**: AES-256-GCM client-side encryption, CSRF tokens, rate limiting, security headers
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## Security Notes
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- Pastes are client-side encrypted (AES-256-GCM) before being sent to server
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- Server never sees the decryption key (stored in URL fragment after `#`)
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- Data is stored **encrypted** in server memory only
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- Data is **never written to disk**
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- All data is lost on server restart
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- CSRF protection via double-submit cookie pattern
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- Rate limiting: 10 requests per minute per IP
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- Security headers: CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy
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- 10MB maximum paste size limit
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- Intended for ephemeral sharing only — do not store sensitive data
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## License
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This project is licensed under the GNU General Public License v3.0 or later (GPLv3+). See the [LICENSE](LICENSE) file for details.
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