uf2-net（超滤网）

uf2.net URL Shortener

Create and manage short URLs via the uf2.net API. This skill provides a CLI wrapper for the uf2.net service (https://uf2.net), an API-first URL shortener designed for automation and bots.

Quick Start

1. Register for API Key

If you don't have a uf2.net account:

curl -X POST https://uf2.net/api/v1/accounts/register \
  -H "Content-Type: application/json" \
  -d '{"username":"your-username"}'

Response includes api_key field. Store this securely (see Credential Management below).

2. Set Environment Variable

export UF2_API_KEY="uf2_..."

Important: Do not hardcode API keys in scripts or commit them to version control.

3. Common Operations

Shorten a URL:

scripts/uf2.sh create "https://example.com/long/path"
# → {"short_url":"https://uf2.net/abc123",...}

Custom slug:

scripts/uf2.sh create "https://github.com/my-repo" "my-repo" "My GitHub Repo"
# → {"short_url":"https://uf2.net/my-repo",...}

List your links:

scripts/uf2.sh list 10
# → {"links":[...],"total":42}

Get link stats (public, no auth needed):

scripts/uf2.sh get abc123
# → {"code":"abc123","click_count":42,...}

Delete a link:

scripts/uf2.sh delete abc123

Credential Management

Recommended: Environment Variables

Most secure for temporary/session use:

export UF2_API_KEY="uf2_..."

For Persistent Storage

Choose one based on your security requirements:

Option 1: Shell profile (user-only access)

echo 'export UF2_API_KEY="uf2_..."' >> ~/.zshrc
# or ~/.bashrc for bash

Option 2: OpenClaw secret store (if available)

# Store in OpenClaw's secure credential storage
# (consult OpenClaw docs for secret management)

Option 3: System keychain/credential manager

# macOS Keychain, Linux Secret Service, Windows Credential Manager
# Use OS-native secure storage

⚠️ Avoid: Storing keys in plain text files in shared or version-controlled directories.

Direct API Usage

For operations not covered by the script, use curl directly. See api.md for full API reference.

Example:

curl -X POST https://uf2.net/api/v1/links \
  -H "X-API-Key: $UF2_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com","slug":"custom"}'

Service Details

• Service: uf2.net (https://uf2.net)
• Type: API-first URL shortener for bots and engineers
• TLS: Yes (HTTPS only)
• API Docs: https://uf2.net/docs (Swagger), https://uf2.net/redoc (ReDoc)
• Registration: Open, free tier available
• Rate Limits: 20 registrations per IP per hour; reasonable use for authenticated endpoints

Key Features

• Never expires - Links remain active indefinitely
• Custom slugs - Brand your short URLs (4-64 chars, lowercase a-z0-9_-)
• Click tracking - Monitor usage via click_count
• Public metadata - Anyone can view link stats (GET /links/{code})
• Simple API - RESTful with JSON responses

Constraints

• Max URL length: 2048 characters
• Custom slugs are case-insensitive (stored lowercase)
• Slug conflicts return 409 error
• Private/localhost URLs rejected
• Registration rate limit: 20 per IP per hour

Security Notes

• API key required: All authenticated operations require UF2_API_KEY header
• Link visibility: All created links are publicly accessible (anyone with the short URL can access the target)
• Metadata visibility: Link metadata (click counts, original URL) is publicly readable
• No link expiration: Links persist indefinitely unless manually deleted
• Private URL rejection: The service rejects localhost and private IP ranges

Resources

• Script: scripts/uf2.sh - CLI wrapper for common operations
• Reference: references/api.md - Full API documentation
• Service homepage: https://uf2.net
• API docs: https://uf2.net/docs (Swagger), https://uf2.net/redoc (ReDoc)