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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)
JSON_VALIDATOR_MAX_DRAFT_VERSION = 4
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)
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
def valid_schema?(value)
if draft_version > JSON_VALIDATOR_MAX_DRAFT_VERSION
JSONSchemer.schema(Pathname.new(schema_path)).valid?(value)
else
JSON::Validator.validate(schema_path, value)
end
end
def schema_path
Rails.root.join('app', 'validators', 'json_schemas', "#{options[:filename]}.json").to_s
end
def draft_version
options[:draft] || JSON_VALIDATOR_MAX_DRAFT_VERSION
end
end
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