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require 'active_support/concern'
require 'active_support/core_ext/hash/indifferent_access'
require 'active_support/rescuable'
module ActionController
class ParameterMissing < IndexError
attr_reader :param
def initialize(param)
@param = param
super("key not found: #{param}")
end
end
class Parameters < ActiveSupport::HashWithIndifferentAccess
attr_accessor :permitted
alias :permitted? :permitted
def initialize(attributes = nil)
super(attributes)
@permitted = false
end
def permit!
@permitted = true
self
end
def require(key)
self[key].presence || raise(ParameterMissing.new(key))
end
alias :required :require
def permit(*filters)
params = self.class.new
filters.each do |filter|
case filter
when Symbol, String then
params[filter] = self[filter] if has_key?(filter)
when Hash then
self.slice(*filter.keys).each do |key, value|
return unless value
key = key.to_sym
params[key] = each_element(value) do |value|
# filters are a Hash, so we expect value to be a Hash too
next if filter.is_a?(Hash) && !value.is_a?(Hash)
value = self.class.new(value) if !value.respond_to?(:permit)
value.permit(*Array.wrap(filter[key]))
end
end
end
end
params.permit!
end
def [](key)
convert_hashes_to_parameters(key, super)
end
def fetch(key, *args)
convert_hashes_to_parameters(key, super)
rescue KeyError
raise ActionController::ParameterMissing.new(key)
end
def slice(*keys)
self.class.new(super)
end
def dup
super.tap do |duplicate|
duplicate.instance_variable_set :@permitted, @permitted
end
end
private
def convert_hashes_to_parameters(key, value)
if value.is_a?(Parameters) || !value.is_a?(Hash)
value
else
# Convert to Parameters on first access
self[key] = self.class.new(value)
end
end
def each_element(object)
if object.is_a?(Array)
object.map { |el| yield el }.compact
else
yield object
end
end
end
module StrongParameters
extend ActiveSupport::Concern
include ActiveSupport::Rescuable
included do
rescue_from(ActionController::ParameterMissing) do |parameter_missing_exception|
render text: "Required parameter missing: #{parameter_missing_exception.param}", status: :bad_request
end
end
def params
@_params ||= Parameters.new(request.parameters)
end
def params=(val)
@_params = val.is_a?(Hash) ? Parameters.new(val) : val
end
end
end
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