ActiveStorage::Openstack

This rails plugin wraps the OpenStack Swift provider as an Active Storage service.

Compatible with rails 6.0.x, 6.1.x, 7.0.x as well as rails main branch (edge).

Compatible with ruby 2.5, 2.6, 2.7, 3.0, 3.1.

This gem currently supports fog-openstack version ~ 1.0

Installation

Add this line to your application's Gemfile ( Add the second line for ruby 3/3.1 support)

gem 'activestorage-openstack', '1.0'
gem 'fog-openstack', github: 'chaadow/fog-openstack' # Temporary, for ruby 3 support, until the PR is merged and released

Usage

in config/storage.yml, in your Rails app, you can create as many entries as you wish. Here is an example with rails 6.1 new support for public containers

# Here you can have the common authentication credentials and config
# by defining a YAML anchor
default_config: &default_config
  service: OpenStack
  credentials:
    openstack_auth_url: <auth url>
    openstack_username: <username>
    openstack_api_key: <password>
    openstack_region: <region>
    openstack_temp_url_key: <temp url key> # Mandatory, instructions below
  connection_options: # optional
    chunk_size: 2097152 # 2MBs - 1MB is the default

# starting from rails 6.1, you can have a public container generating public
# URLs
public_openstack:
  <<: *default_config # we include the anchor defined above
  public: true # important ; to tell rails that this is a public container
  container: <container name> # Container name for your public OpenStack provider

# this config will generate signed/expired URLs (aka. private URLs)
private_openstack:
  <<: *default_config # we include the anchor defined above
  public: false # Optional in this case, because false is the default value
  container: <container name> # Container name for your private OpenStack provider

You can create as many entries as you would like for your different environments. For instance: public_openstack for development, test_openstack for test environment, and prod_openstack for production. This way you can choose the appropriate container for each scenario.

Then register the provider in your config/{environment}.rb (config/development.rb/config/test.rb/config/production.rb)

For example, for the public_openstack entry above, change the config variable in config/development.rb like the following:

# Store uploaded files on the local file system (see config/storage.yml for options)
config.active_storage.service = :public_openstack

Setting up a container

From your OpenStack provider website, create or sign in to your account. Then from your dashboard, create a container, and save the configuration generated.

It is a good practice to create a separate container for each of your environments. Once safely saved, you can add them to your storage configuration in your Rails application.

temp_url_key configuration

the openstack_temp_url_key in your configuration is mandatory for generating URLs (expiring ones) as well as for Direct Upload. You can set it up with Swift or with the Fog/OpenStack gem. More instructions on how to set it up with Swift are found HERE

The next version of this plugin, will add a rails generator, or expose a method that would use the built-in method from Fog::OpenStack::Real to generate the key.

ActiveStorage::Openstack's Content-Type handling

OpenStack Swift handles the Content-Type of an object differently from other object storage services. You cannot overwrite the Content-Type via a temp URL. This gem will try very hard to set the right Content-Type for an object at object creation (either via server upload or direct upload) but this can be wrong in some edge cases (e.g. you use direct upload and the browser provides a wrong mime type). Thankfully, by implementing the rails hook #update_metadata this will update the object in your container by setting the new content type after it's been uploaded.

Testing

First, run bundle to install the gem dependencies (both development and production)

$ bundle

Then, from the root of the plugin, copy the following file and fill in the appropriate credentials. Preferably, set up a container for your testing, separate from production.

$ cp test/configurations.example.yml test/configurations.yml

And then run the tests:

$ bin/test

Contributions

Contributions are welcome. Feel free to open any issues if you encounter any bug, or if you want to suggest a feature by clicking here: https://github.com/chaadow/activestorage-openstack/issues

License

The gem is available as open source under the terms of the MIT License.