Checkpoint Integration

./Gemfile
  # Canister provides containers
  gem 'canister', '~> 0.9.0'

  # Checkpoint provides authorization support
  # gem 'checkpoint', '~> 1.0.0'
  gem 'checkpoint', git: 'https://github.com/mlibrary/checkpoint', branch: 'master'

./app/controllers/application_controller.rb
  # TODO: See gkostin about this comment if you have any questions.
  # Ensure CanCan by authorize!(<action>, <resource> || <resouce_class>)
  # rescue_from CanCan::AccessDenied, with: :render_unauthorized # TODO: Might be needed
  # check_authorization unless: :devise_controller? || :checkpoint_controller?

  def checkpoint_controller?
    false # Overridden in CheckpointController to return true
  end

./app/controllers/checkpoint_controller.rb
./app/models/ability_checkpoint.rb
./app/policies/*

./bin/setup
  files = ['keycard-development', 'keycard-test', 'checkpoint-development', 'checkpoint-test']

./bin/travis
  files = ['keycard-development', 'keycard-test', 'checkpoint-development', 'checkpoint-test']

./config/initializers/services.rb
  if Settings.checkpoint&.database
    Checkpoint::DB.config.opts = Settings.checkpoint.database
  end

  Services = Canister.new

  Services.register(:checkpoint) { Checkpoint::Authority.new } # Use default implementation

./config/settings/development.yml
  checkpoint:
    database:
      adapter: sqlite
      database: db/checkpoint-development.sqlite3
      pool: 5
      timeout: 5000

./config/settings/test.yml
  checkpoint:
    database:
      adapter: sqlite
      database: db/checkpoint-test.sqlite3
      pool: 5
      timeout: 5000

./db/checkpoint-development.sqlite3.sample
./db/checkpoint-test.sqlite3.sample

NOTE: ./db/checkpoint-test.sqlite3.sample was added to the git repository to support Travis CI integration a.k.a. the database needs to exists for Travis to run.