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# frozen_string_literal: true
#
# JsonSchemaValidator
#
# Custom validator for json schema.
# Create a json schema within the json_schemas directory
#
# class Project < ActiveRecord::Base
# validates :data, json_schema: { filename: "file" }
# end
#
class JsonSchemaValidator < ActiveModel::EachValidator
FILENAME_ALLOWED = /\A[a-z0-9_-]*\Z/.freeze
FilenameError = Class.new(StandardError)
BASE_DIRECTORY = %w(app validators json_schemas).freeze
def initialize(options)
raise ArgumentError, "Expected 'filename' as an argument" unless options[:filename]
raise FilenameError, "Must be a valid 'filename'" unless options[:filename].match?(FILENAME_ALLOWED)
@base_directory = options.delete(:base_directory) || BASE_DIRECTORY
super(options)
end
def validate_each(record, attribute, value)
unless valid_schema?(value)
record.errors.add(attribute, "must be a valid json schema")
end
end
private
attr_reader :base_directory
def valid_schema?(value)
validator.valid?(value)
end
def validator
@validator ||= JSONSchemer.schema(Pathname.new(schema_path))
end
def schema_path
@schema_path ||= Rails.root.join(*base_directory, filename_with_extension).to_s
end
def filename_with_extension
"#{options[:filename]}.json"
end
def draft_version
options[:draft] || JSON_VALIDATOR_MAX_DRAFT_VERSION
end
end
JsonSchemaValidator.prepend_ee_mod
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