18F/identity-idp

# frozen_string_literal: true

module RuboCop
  module Cop
    module IdentityIdp
      # This lint helps make sure that we have language-agnostic identifiers
      # for errors that we log. The error strings are different in each locale
      # so this helps us compare them more directly.
      #
      # @example
      #   #bad
      #   errors.add(:iss, 'invalid issuer')
      #
      #   #good
      #   errors.add(:iss, 'invalid issuer', type: :invalid_issuer)
      #
      class ErrorsAddLinter < RuboCop::Cop::Cop
        MSG = 'Please set a unique key for this error'

        RESTRICT_ON_SEND = [:add].freeze

        def_node_matcher :errors_add_match?, <<~PATTERN
          (send (send nil? :errors) :add $...)
        PATTERN

        def on_send(node)
          return unless errors_add_match?(node)
          _attr, type, options = node.arguments
          return if type && type.type == :sym
          options = type if type && type.type == :hash
          return if options && options.type == :hash && options.keys.map(&:value).include?(:type)
          add_offense(node, location: :expression)
        end
      end
    end
  end
end