Bucket Helper

🇫🇷 · 🇬🇧

Bucket Helper belongs to a collection of libraries called AI Helpers developed for building Artificial Intelligence, each published on PyPI behind its own green CI gate (pytest plus ruff, both blocking) and semantic-versioned releases.

Utility functions for AWS S3 and any S3-compatible object storage: MinIO, Backblaze B2 S3 API, DigitalOcean Spaces, Cloudflare R2, Wasabi, and friends. Built on boto3. Same shape as sftp-helper: a credentials() loader, the usual CRUD (upload / download / delete / exists / list_prefix), and a remote_tempfile context manager for stage-and-share flows.

Object storage keeps files as flat, addressable blobs, a bucket plus a key such as my-bucket/folder/file.txt, instead of a nested folder tree on a hard drive: nothing to create in advance, no limit on how many files pile up in one place, and every object is reachable straight from a URL. Amazon Web Services built the first popular version of this, S3 (Simple Storage Service), and its wire protocol became the de facto standard: MinIO, Backblaze B2, DigitalOcean Spaces, Cloudflare R2, and Wasabi all speak the same S3 API, so bucket-helper runs unchanged against any of them; only the endpoint URL changes.

🌍 AI Helpers

The Promise

Remote by design. bucket-helper exists to move data to and from object storage you choose: AWS, or any S3-compatible endpoint you point it at (including a MinIO instance on your own network). It is deliberately not local-first and ships no GUI. For a remote reached over SFTP instead of S3, use sftp-helper; for downloading media from a URL, use youtube-helper.

That remote reach is also where "battle-tested" has to mean something checkable, not a slogan. Every push runs a blocking CI gate: the test suite exercises the S3 client against a moto-mocked backend, then ruff checks style; nothing merges to main on a red run. The package has shipped through nine semantic-versioned releases on PyPI, from v0.2.2 to the current v1.1.2 (the tag history is visible with git tag). It depends on os-helper, the small foundation package the whole AI Helpers suite shares for logging and file handling; nothing here reinvents that layer.

Related MCP server: MinIO MCP Server

Documentation

💻 Documentation

🗺️ Landscape

📋 Examples

🎯 Triggers

Features

• CRUD against AWS S3 or any S3-compatible endpoint: upload, download, delete, exists, list_prefix.

• Works against any S3-compatible provider, MinIO, Backblaze B2 S3 API, DigitalOcean Spaces, Cloudflare R2, Wasabi, by pointing the endpoint_url credential at it; no code changes per provider.

• Credentials loader (credentials) resolving JSON / YAML / environment variables / .env, in that fallback order.

• remote_tempfile context manager for stage-and-share flows: upload, hand back the object, auto-delete on block exit, no manual cleanup.

• Three surfaces, one behavior: Python library, argparse CLI, click CLI twin ([cli] extra), and FastAPI HTTP surface ([api] extra). See the multi-surface section.

• Docker image ships the HTTP server ready to run.

Installation

Prerequisites: Python 3.10–3.13 and git, cross-platform:

• 🍎 macOS (Homebrew): brew install python git

• 🐧 Ubuntu/Debian: sudo apt update && sudo apt install -y python3 python3-pip git

• 🪟 Windows (PowerShell): winget install Python.Python.3.12 Git.Git

We recommend using Python environments. Check this link if you're unfamiliar with setting one up: 🥸 Tech tips.

From PyPI (recommended)

# Core library (credentials loader + CRUD + remote_tempfile)
pip install bucket-helper

# Optional surfaces
pip install "bucket-helper[cli]"       # click-based CLI twin
pip install "bucket-helper[api]"       # FastAPI HTTP surface

From source (no PyPI)

git clone https://github.com/warith-harchaoui/bucket-helper.git
cd bucket-helper
pip install -e .

# Optional surfaces
pip install -e ".[cli]"
pip install -e ".[api]"

The argparse CLI is always available. The [cli] extra adds the click twin.

Configuration

A ready-to-fill template is committed at settings.yaml.example. Copy it to settings.yaml and edit in place: settings.yaml is gitignored, so you cannot accidentally commit secrets.

cp settings.yaml.example settings.yaml
# then edit settings.yaml with your AWS / MinIO / R2 / B2 credentials

You may also write JSON instead of YAML, use a .env, or set environment variables; bucket-helper falls back in that order via os_helper.get_config. Required keys:

{
  "s3_access_key": "AKIA...",
  "s3_secret_key": "...",
  "s3_bucket":     "my-bucket",
  "s3_https":      "https://my-bucket.s3.eu-west-3.amazonaws.com"
}

Optional keys:

Endpoint URLs for common S3-compatible storage

Set s3_endpoint_url to:

Usage

For the full catalog of recipes (uploads / downloads / listings, S3-compatible endpoints such as MinIO / R2 / B2 / Spaces / Wasabi, temporary remote keys with auto-cleanup, mirroring with sftp-helper), see 📋 EXAMPLES.md.

import bucket_helper as bh

# Load creds: JSON / YAML / env / .env (auto-fallback in that order)
cred = bh.credentials("path/to/settings.yaml")

# Upload a local file
uri = bh.upload("local.txt", cred, "folder/uploaded.txt")
# uri == "s3://my-bucket/folder/uploaded.txt"

assert bh.exists(uri, cred)

# Download
bh.download(uri, "downloaded.txt", cred)

# List
for key in bh.list_prefix("folder/", cred):
    print(key)

# Delete
bh.delete(uri, cred)

MinIO example

cred = {
    "s3_access_key":      "minioadmin",
    "s3_secret_key":      "minioadmin",
    "s3_bucket":          "uploads",
    "s3_https":           "http://minio.example.com:9000/uploads",
    "s3_endpoint_url":    "http://minio.example.com:9000",
    "s3_use_path_style":  "true",
    "s3_region":          "us-east-1",  # MinIO accepts any region string
}

bh.make_bucket("uploads", cred)
bh.upload("file.bin", cred, "file.bin")

Stage-and-share with remote_tempfile

Drop a generated file at a unique random key, hand the public URL to a downstream worker / webhook, and the object is deleted on block exit (even if the body raises):

import bucket_helper as bh
import requests

cred = bh.credentials("path/to/settings.yaml")

with bh.remote_tempfile(cred, ext="json", prefix="runs") as (s3_addr, public_url):
    bh.upload("payload.json", cred, s3_addr, content_type="application/json")
    # Hand the URL to something that fetches it once.
    requests.post("https://hook.example.com/process", json={"input_url": public_url}).raise_for_status()
# Object is gone here, no manual cleanup.

Multi-surface exposure

Every public function in the library is also exposed as:

• argparse CLI: bucket-helper <subcommand> (installed by default).

• click CLI: bucket-helper-click <subcommand> (install [cli] extra).

• FastAPI HTTP: uvicorn bucket_helper.api:app --host 0.0.0.0 --port 8000 (install [api] extra).

• MCP: bucket-helper-mcp exposes the same HTTP surface as MCP tools for any MCP-aware agent host (install [mcp] extra).

Both CLIs share the same subcommand names and flags; pick your favourite.

The exhaustive catalogue of what triggers the toolkit (natural-language phrasings, commands, functions, address cues, and explicit SKIP rules) lives in TRIGGERS.md.

CLI examples

# argparse CLI (always available)
bucket-helper upload      --config settings.yaml --input local.txt --key folder/uploaded.txt
bucket-helper exists      --config settings.yaml --key folder/uploaded.txt
bucket-helper download    --config settings.yaml --key folder/uploaded.txt --output back.txt
bucket-helper list        --config settings.yaml --prefix folder/
bucket-helper delete      --config settings.yaml --key folder/uploaded.txt
bucket-helper make-bucket --config settings.yaml --bucket new-bucket
bucket-helper tempfile    --config settings.yaml --ext json --prefix runs
bucket-helper strip-path  --config settings.yaml --address s3://my-bucket/path/to/obj

# click CLI: same verbs, same flags
bucket-helper-click upload --config settings.yaml --input local.txt --key folder/uploaded.txt

HTTP server

# Serve HTTP (default credentials picked up from BUCKET_HELPER_CONFIG)
BUCKET_HELPER_CONFIG=$PWD/settings.yaml uvicorn bucket_helper.api:app --host 0.0.0.0 --port 8000
# → Swagger UI at http://localhost:8000/docs

Per-request credentials can also be sent as multipart form fields (s3_access_key / s3_secret_key / s3_bucket / s3_https / …).

Docker

docker build -t bucket-helper .
docker run --rm -p 8000:8000 \
  -e BUCKET_HELPER_CONFIG=/config/settings.yaml \
  -v $PWD/settings.yaml:/config/settings.yaml:ro \
  bucket-helper

See also: TRIGGERS.md (what invokes the toolkit) and GUI.md (visual product design plan; no GUI ships, bucket-helper is remote object-storage plumbing).

Author

• Warith HARCHAOUI

Acknowledgements

Special thanks to Mohamed Chelali and Bachir Zerroug for fruitful discussions.

License

This project is licensed under the BSD-3-Clause License; see the LICENSE file for details.