:star2: :star2: Store archives privately on S3 :star2: :star2:

Star helps you write Ruby apps that need to store files on S3 and retrieve them with expiring URLs.

After configuring your app, you can write a file to S3 by running:

  file = Star::File.new
  file.open{|f| f << "some text to store in a remote file"}

You can successively retrieve the same file from S3 by calling:

  url = file.url

This will provide a URL that everyone can access for the next 30 seconds.

After 30 seconds, access to the file using that URL will be denied.

Why use Star

Star is not the only Ruby library to help Ruby developers store archives on S3. However, most other libraries are huge and heavy on dependencies.

Star does one thing, and does it well. The codebase is small and there are no runtime dependencies. This means less footprint on your app, and code that is easier to read, maintain and upgrade.

How to install

To install on your system, run

gem install star

To use inside a bundled Ruby project, add this line to the Gemfile:

gem 'star', '~> 0.1.0'

How to use

To write a file to S3, configure your app, then create a new remote file instance:

file = Star::File.new

You can now call any method you would normally use to add content to a File, for instance:

file.open do |f|
  f << "append some text"
  f.write "write some other text"
  f.writeln "write a line of text"
end

Once the file is closed, Star will automatically upload it to S3.

To read the same file from S3, get its URL by calling

file.url

By default, this URL will only be publicly available for 30 seconds. This is useful to let your users download the file, while preventing them from sharing the URL and having other (unauthenticated) users download it.

Options

When you create a new remote file instance, you can set these options:

  • name: the file name (defaults to 'attachment')
  • content_type: the content type for the file (defaults to 'application/octet-stream')
  • folder: the remote folder where to store the file (defaults to 'attachments')

For instance, you can call File.new with these options:

Star::File.new name: 'test.csv', content_type: 'text/csv', folder: 'spreadsheets'

How to configure

In order to use Star you must have an S3 account.

Log into your account to retrieve your access key ID, secret access key and bucket name, then add the following code to your app:

Star.configure do |config|
  config.access_key_id = '<YOUR S3 ACCESS KEY ID>'
  config.secret_access_key = '<YOUR S3 SECRET ACCESS KEY>'
  config.bucket = '<YOUR S3 BUCKET NAME>'
end

Make sure that this code is run before you use Star. For instance, in a Rails app, you can store this code in config/initializers/star.rb.

Star also provide two options that you can set in your configuration:

  • duration specifies how many seconds the expiring URLs should be valid for (default: 30)
  • location specifies the subfolder of your bucket where files should be stored (default: '/')
  • remote specifies that files will be stored remotely on S3 (default: true)

For instance, your configuration could look like this:

Star.configure do |config|
  config.access_key_id = '<YOUR S3 ACCESS KEY ID>'
  config.secret_access_key = '<YOUR S3 SECRET ACCESS KEY>'
  config.bucket = '<YOUR S3 BUCKET NAME>'
  config.duration = 60
  config.location = 'production/uploads'
end

Configuring with environment variables

As an alternative to the approach above, you can configure your app with environment variables. For instance, setting the following variables:

export AWS_ACCESS_KEY_ID="<YOUR S3 ACCESS KEY ID>"
export AWS_SECRET_ACCESS_KEY="<YOUR S3 SECRET ACCESS KEY>"
export AWS_BUCKET="<YOUR S3 BUCKET NAME>"
export STAR_DURATION="60"
export STAR_LOCATION="production/uploads"

is equivalent to configuring your app with the initializer above.

How to store files locally

If you set Star.configuration.remote to false, then your files will be stored locally, rather than remotely on S3.

This is very convenient if you use Star in a Rails application. By adding the following lines to config/environments/development.rb:

Star.configure do |config|
  config.remote = false
  config.location = Rails.public_path
end

all your files will be stored in your public/ folder while developing. In production, your files will still be stored on S3.

Your Rails controller/action that redirects to a file might look like this:

if Star.remote?
  redirect_to file.url
else
  send_file file.path, type: file.content_type
end

How to contribute

If you find that a method is missing, fork the project, add the missing code, write the appropriate tests, then submit a pull request, and it will gladly be merged!

In order to test, you need to have access to a S3 account that will be used to upload and download test files.

Set the following environment variables to match your S3 account, then run rspec to run the tests:

export STAR_TEST_AWS_ACCESS_KEY_ID="<YOUR TEST S3 ACCESS KEY ID>"
export STAR_TEST_SECRET_ACCESS_KEY="<YOUR TEST S3 SECRET ACCESS KEY>"
export STAR_TEST_BUCKET="<YOUR TEST S3 BUCKET NAME>"
export STAR_TEST_LOCATION="<YOUR TEST S3 FOLDER>"

How to release new versions

If you are a manager of this project, remember to upgrade the Star gem whenever a new feature is added or a bug gets fixed.

Make sure all the tests are passing on Travis CI, document the changes in CHANGELOG.md and README.md, bump the version, then run

rake release

Remember that the star gem follows Semantic Versioning. Any new release that is fully backward-compatible should bump the patch version (0.0.x). Any new version that breaks compatibility should bump the minor version (0.x.0)