send-me-my-files-r2-upload-with-short-lived-signed-urls

Imported from sundial-org/awesome-openclaw-skills (skills/send-me-my-files-r2-upload-with-short-lived-signed-urls/SKILL.md). Install upstream with npx skills add sundial-org/awesome-openclaw-skills --skill send-me-my-files-r2-upload-with-short-lived-signed-urls. Copyright stays with the author.

Send Me My Files - R2 Upload with Short Lived Signed URLs

Upload files to Cloudflare R2 or any S3-compatible storage and generate presigned download links.

Features

• Upload files to R2/S3 buckets
• Generate presigned download URLs (configurable expiration)
• Support for any S3-compatible storage (R2, AWS S3, MinIO, etc.)
• Multiple bucket configurations
• Automatic content-type detection

Configuration

Create ~/.r2-upload.yml (or set R2_UPLOAD_CONFIG env var):

# Default bucket (used when no bucket specified)
default: my-bucket

# Bucket configurations
buckets:
  my-bucket:
    endpoint: https://abc123.r2.cloudflarestorage.com
    access_key_id: your_access_key
    secret_access_key: your_secret_key
    bucket_name: my-bucket
    public_url: https://files.example.com  # Optional: custom domain
    region: auto  # For R2, use "auto"
    
  # Additional buckets
  personal:
    endpoint: https://xyz789.r2.cloudflarestorage.com
    access_key_id: ...
    secret_access_key: ...
    bucket_name: personal-files
    region: auto

Cloudflare R2 Setup

1. Go to Cloudflare Dashboard → R2
2. Create a bucket
3. Go to R2 API Tokens: https://dash.cloudflare.com/<ACCOUNT_ID>/r2/api-tokens
4. Create a new API token
   • Important: Apply to specific bucket (select your bucket)
   • Permissions: Object Read & Write
5. Copy the Access Key ID and Secret Access Key
6. Use endpoint format: https://<account_id>.r2.cloudflarestorage.com
7. Set region: auto

AWS S3 Setup

aws-bucket:
  endpoint: https://s3.us-east-1.amazonaws.com
  access_key_id: ...
  secret_access_key: ...
  bucket_name: my-aws-bucket
  region: us-east-1

Usage

Upload a file

r2-upload /path/to/file.pdf
# Returns: https://files.example.com/abc123/file.pdf?signature=...

Upload with custom path

r2-upload /path/to/file.pdf --key uploads/2026/file.pdf

Upload to specific bucket

r2-upload /path/to/file.pdf --bucket personal

Custom expiration (default: 5 minutes)

r2-upload /path/to/file.pdf --expires 24h
r2-upload /path/to/file.pdf --expires 1d
r2-upload /path/to/file.pdf --expires 300  # seconds

Public URL (no signature)

r2-upload /path/to/file.pdf --public

Tools

• r2_upload - Upload file and get presigned URL
• r2_list - List recent uploads
• r2_delete - Delete a file

Environment Variables

• R2_UPLOAD_CONFIG - Path to config file (default: ~/.r2-upload.yml)
• R2_DEFAULT_BUCKET - Override default bucket
• R2_DEFAULT_EXPIRES - Default expiration in seconds (default: 300 = 5 minutes)

Notes

• Uploaded files are stored with their original filename unless --key is specified
• Automatic UUID prefix added to prevent collisions (e.g., abc123/file.pdf)
• Content-Type automatically detected from file extension
• Presigned URLs expire after the configured duration