S3PyPI

S3PyPI is a CLI for creating a Python Package Repository in an S3 bucket.

Why?

The official Python Package Index (PyPI) is a public repository of Python software. It's used by pip to download packages.

If you work at a company, you may wish to publish your packages somewhere private instead, and still have them be accessible via pip install. This requires hosting your own repository.

S3PyPI enables hosting a private repository at a low cost. It requires only an S3 bucket for storage, and some way to serve files over HTTPS (e.g. Amazon CloudFront).

Publishing packages and index pages to S3 is done using the s3pypi CLI. Creating the S3 bucket and CloudFront distribution is done using a provided Terraform configuration, which you can tailor to your own needs.

Alternatives

• AWS CodeArtifact is a fully managed service that integrates with IAM.

Getting started

Installation

Install s3pypi using pip:

$ pip install s3pypi

Setting up S3 and CloudFront

Before you can start using s3pypi, you must set up an S3 bucket for storing packages, and a CloudFront distribution for serving files over HTTPS. Both of these can be created using the Terraform configuration provided in the terraform/ directory:

$ git clone https://github.com/gorilla-co/s3pypi.git
$ cd s3pypi/terraform/

$ terraform init
$ terraform apply

You will be asked to enter your desired AWS region, S3 bucket name, and domain name for CloudFront. You can also enter these in a file named config.auto.tfvars:

region = "eu-west-1"
bucket = "example-bucket"
domain = "pypi.example.com"

DNS and HTTPS

The Terraform configuration assumes that a Route 53 hosted zone exists for your domain, with a matching (wildcard) certificate in AWS Certificate Manager. If your certificate is a wildcard certificate, add use_wildcard_certificate = true to config.auto.tfvars.

Distributed locking with DynamoDB

To ensure that concurrent invocations of s3pypi do not overwrite each other's changes, the objects in S3 can be locked via an optional DynamoDB table (using the --lock-indexes option). To create this table, add enable_dynamodb_locking = true to config.auto.tfvars.

Basic authentication

To enable basic authentication, add enable_basic_auth = true to config.auto.tfvars. This will attach a Lambda@Edge function to your CloudFront distribution that reads user passwords from AWS Systems Manager Parameter Store. Users and passwords can be configured using the put_user.py script:

$ basic_auth/put_user.py pypi.example.com alice
Password:

This creates a parameter named /s3pypi/pypi.example.com/users/alice. Passwords are hashed with a random salt, and stored as JSON objects:

{
  "password_hash": "7364151acc6229ec1468f54986a7614a8b215c26",
  "password_salt": "RRoCSRzvYJ1xRra2TWzhqS70wn84Sb_ElKxpl49o3Y0"
}

Terraform module

The Terraform configuration can also be included in your own project as a module:

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 4.0"
    }
  }
}

provider "aws" {
  region = "eu-west-1"
}

provider "aws" {
  alias  = "us_east_1"
  region = "us-east-1"
}

module "s3pypi" {
  source = "github.com/gorilla-co/s3pypi//terraform/modules/s3pypi"

  bucket = "example-bucket"
  domain = "pypi.example.com"

  use_wildcard_certificate = true
  enable_dynamodb_locking  = true
  enable_basic_auth        = true

  providers = {
    aws.us_east_1 = aws.us_east_1
  }
}

Migrating from s3pypi 0.x to 1.x

Existing resources created using the CloudFormation templates from s3pypi 0.x can be imported into Terraform and removed from CloudFormation. For example:

$ terraform init
$ terraform import module.s3pypi.aws_s3_bucket.pypi example-bucket
$ terraform import module.s3pypi.aws_cloudfront_distribution.cdn EDFDVBD6EXAMPLE
$ terraform apply

In this new configuration, CloudFront uses the S3 REST API endpoint as its origin, not the S3 website endpoint. This allows the bucket to remain private, with CloudFront accessing it through an Origin Access Identity (OAI). To make this work with your existing S3 bucket, all <package>/index.html objects must be renamed to <package>/. You can do so using the provided script:

$ scripts/migrate-s3-index.py example-bucket

To instead keep using the old configuration with a publicly accessible S3 website endpoint, pass the following options when uploading packages:

$ s3pypi upload ... --index.html --s3-put-args='ACL=public-read'

Example IAM policy

The s3pypi CLI requires the following IAM permissions to access S3 and (optionally) DynamoDB. Replace example-bucket by your S3 bucket name.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": "arn:aws:s3:::example-bucket/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket"
      ],
      "Resource": "arn:aws:s3:::example-bucket"
    },
    {
      "Effect": "Allow",
      "Action": [
        "dynamodb:GetItem",
        "dynamodb:PutItem",
        "dynamodb:DeleteItem"
      ],
      "Resource": "arn:aws:dynamodb:*:*:table/example-bucket-locks"
    }
  ]
}

Usage

Distributing packages

You can now use s3pypi to upload packages to S3:

$ cd /path/to/your-project/
$ python setup.py sdist bdist_wheel

$ s3pypi upload dist/* --bucket example-bucket [--prefix PREFIX]

See s3pypi --help for a description of all options.

Installing packages

Install your packages using pip by pointing the --extra-index-url to your CloudFront domain. If you used --prefix while uploading, then add the prefix here as well:

$ pip install your-project --extra-index-url https://pypi.example.com/PREFIX/

Alternatively, you can configure the index URL in ~/.pip/pip.conf:

[global]
extra-index-url = https://pypi.example.com/PREFIX/

Roadmap

Currently there are no plans to add new features to s3pypi. If you have any ideas for new features, check out our contributing guidelines on how to get these on our roadmap.

Contact

Got any questions or ideas? We'd love to hear from you. Check out our contributing guidelines for ways to offer feedback and contribute.

License

Copyright (c) Gorillini NV. All rights reserved.

Licensed under the MIT License.