s3-credentials 0.17

New release of my s3-credentials CLI tool for managing credentials needed to access just one S3 bucket. Here are the release notes in full:

• New commands get-bucket-policy and set-bucket-policy. #91
• New commands get-public-access-block and set-public-access-block. #92
• New localserver command for starting a web server that makes time limited credentials accessible via a JSON API. #93

That s3-credentials localserver command (documented here) is a little obscure, but I found myself wanting something like that to help me test out a new feature I'm building to help create temporary Litestream credentials using Amazon STS.

Most of that new feature was built by Claude Code from the following starting prompt:

Add a feature s3-credentials localserver which starts a localhost weberver running (using the Python standard library stuff) on port 8094 by default but -p/--port can set a different port and otherwise takes an option that names a bucket and then takes the same options for read--write/read-only etc as other commands. It also takes a required --refresh-interval option which can be set as 5m or 10h or 30s. All this thing does is reply on / to a GET request with the IAM expiring credentials that allow access to that bucket with that policy for that specified amount of time. It caches internally the credentials it generates and will return the exact same data up until they expire (it also tracks expected expiry time) after which it will generate new credentials (avoiding dog pile effects if multiple requests ask at the same time) and return and cache those instead.

Tags: aws, projects, s3, ai, annotated-release-notes, s3-credentials, prompt-engineering, generative-ai, llms, coding-agents, claude-code

Poe the Poet

I was looking for a way to specify additional commands in my pyproject.toml file to execute using uv. There's an enormous issue thread on this in the uv issue tracker (300+ comments dating back to August 2024) and from there I learned of several options including this one, Poe the Poet.

It's neat. I added it to my s3-credentials project just now and the following now works for running the live preview server for the documentation:

uv run poe livehtml

Here's the snippet of TOML I added to my pyproject.toml:

[dependency-groups]
test = [
    "pytest",
    "pytest-mock",
    "cogapp",
    "moto>=5.0.4",
]
docs = [
    "furo",
    "sphinx-autobuild",
    "myst-parser",
    "cogapp",
]
dev = [
    {include-group = "test"},
    {include-group = "docs"},
    "poethepoet>=0.38.0",
]

[tool.poe.tasks]
docs = "sphinx-build -M html docs docs/_build"
livehtml = "sphinx-autobuild -b html docs docs/_build"
cog = "cog -r docs/*.md"

Since poethepoet is in the dev= dependency group any time I run uv run ... it will be available in the environment.

Tags: packaging, python, s3-credentials, uv