pastebin

README

Pastebin

A simple, self-hosted pastebin service with S3-compatible storage backend.

Features

• Store and share text snippets with unique URLs
• Syntax highlighting with CodeMirror
• Configurable time-to-live (TTL) for pastes
• Automatic cleanup of expired pastes
• Content-addressable storage using SHA256 checksums
• S3-compatible storage backend (AWS S3, MinIO, etc.)
• Data integrity verification on retrieval
• Copy to clipboard functionality
• Raw paste view

Security Features

• CSRF protection using double-submit cookie pattern
• Request body size limits to prevent memory exhaustion
• Security headers (X-Content-Type-Options, X-Frame-Options, X-XSS-Protection, Referrer-Policy)
• Input validation for all URL parameters
• Configurable secure cookies for HTTPS deployments

Configuration

Configuration is done via environment variables:

Variable	Description	Default
S3_BUCKET	S3 bucket name (required)	-
S3_ENDPOINT	S3 endpoint URL	s3.amazonaws.com
S3_REGION	S3 region	us-east-1
S3_USE_SSL	Use HTTPS for S3	true
AWS_ACCESS_KEY_ID	AWS access key	-
AWS_SECRET_ACCESS_KEY	AWS secret key	-
PASTEBIN_HOST	Listen host	127.0.0.1
PASTEBIN_PORT	Listen port	8080
MAX_PASTE_SIZE	Maximum paste size in bytes	1048576 (1MB)
DEFAULT_TTL	Default paste TTL	8760h (1 year)
CLEANUP_INTERVAL	Interval between cleanup runs	1h
LOG_FORMAT	Log format (text or json)	text
LOG_LEVEL	Log level (debug, info, warn, error)	info
SECURE_COOKIES	Set Secure flag on cookies (enable for HTTPS)	false

Running

Version Information

./pastebin --version
# pastebin v1.0.0 (commit: abc1234)

With Docker Compose

docker-compose up

Manually

# Build
go build -o pastebin ./cmd/pastebin

# Run (with MinIO example)
export S3_BUCKET=pastebin
export S3_ENDPOINT=localhost:9000
export S3_USE_SSL=false
export AWS_ACCESS_KEY_ID=minioadmin
export AWS_SECRET_ACCESS_KEY=minioadmin

./pastebin

API Endpoints

Method	Path	Description
GET	/	Home page with paste form
POST	/	Create a new paste
GET	/{checksum}	View a paste
GET	/raw/{checksum}	View raw paste content
POST	/delete/{checksum}	Delete a paste
GET	/health	Health check endpoint

Health Check

The /health endpoint returns 200 OK with body OK when the service is running. This can be used for load balancer health checks and monitoring.

curl http://localhost:8080/health
# OK

Storage

Pastes are stored in S3 with the following structure:

• pastes/{checksum} - The paste content
• meta/{checksum}.json - Metadata (created time, expiry, size)

The checksum is the SHA256 hash of the paste content, ensuring deduplication and data integrity verification on retrieval.

Development

Running Tests

go test ./...

Building

go build -o pastebin ./cmd/pastebin

Releasing

Releases are automated via GitHub Actions. To create a new release:

1. Ensure all changes are committed and pushed to the main branch
2. Create and push a version tag:

git tag v1.0.0
git push origin v1.0.0

The release workflow will automatically:

• Build binaries for Linux (amd64, arm64) and macOS (amd64, arm64)
• Build and push multi-arch Docker images to ghcr.io
• Create a GitHub release with binaries and checksums

Docker images are tagged with:

• Full version (e.g., v1.0.0)
• Minor version (e.g., 1.0)
• Major version (e.g., 1)
• Git SHA

License

See LICENSE file.