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module RailsAdmin
module Extensions
module CanCan
# This adapter is for the CanCan[https://github.com/ryanb/cancan] authorization library.
# You can create another adapter for different authorization behavior, just be certain it
# responds to each of the public methods here.
class AuthorizationAdapter
# See the +authorize_with+ config method for where the initialization happens.
def initialize(controller, ability = ::Ability)
@controller = controller
@controller.instance_variable_set '@ability', ability
@controller.extend ControllerExtension
@controller.current_ability.authorize! :access, :rails_admin
end
# This method is called in every controller action and should raise an exception
# when the authorization fails. The first argument is the name of the controller
# action as a symbol (:create, :bulk_delete, etc.). The second argument is the
# AbstractModel instance that applies. The third argument is the actual model
# instance if it is available.
def authorize(action, abstract_model = nil, model_object = nil)
@controller.current_ability.authorize!(action, model_object || abstract_model && abstract_model.model) if action
end
# This method is called primarily from the view to determine whether the given user
# has access to perform the action on a given model. It should return true when authorized.
# This takes the same arguments as +authorize+. The difference is that this will
# return a boolean whereas +authorize+ will raise an exception when not authorized.
def authorized?(action, abstract_model = nil, model_object = nil)
@controller.current_ability.can?(action, model_object || abstract_model && abstract_model.model) if action
end
# This is called when needing to scope a database query. It is called within the list
# and bulk_delete/destroy actions and should return a scope which limits the records
# to those which the user can perform the given action on.
def query(action, abstract_model)
abstract_model.model.accessible_by(@controller.current_ability, action)
end
# This is called in the new/create actions to determine the initial attributes for new
# records. It should return a hash of attributes which match what the user
# is authorized to create.
def attributes_for(action, abstract_model)
@controller.current_ability.attributes_for(action, abstract_model && abstract_model.model)
end
module ControllerExtension
def current_ability
# use _current_user instead of default current_user so it works with
# whatever current user method is defined with RailsAdmin
@current_ability ||= @ability.new(_current_user)
end
end
end
end
end
end
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