47 lines
1.3 KiB
Ruby
47 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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#
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# JsonSchemaValidator
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#
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# Custom validator for json schema.
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# Create a json schema within the json_schemas directory
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#
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# class Project < ActiveRecord::Base
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# validates :data, json_schema: { filename: "file" }
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# end
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#
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class JsonSchemaValidator < ActiveModel::EachValidator
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FILENAME_ALLOWED = /\A[a-z0-9_-]*\Z/.freeze
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FilenameError = Class.new(StandardError)
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JSON_VALIDATOR_MAX_DRAFT_VERSION = 4
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def initialize(options)
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raise ArgumentError, "Expected 'filename' as an argument" unless options[:filename]
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raise FilenameError, "Must be a valid 'filename'" unless options[:filename].match?(FILENAME_ALLOWED)
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super(options)
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end
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def validate_each(record, attribute, value)
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unless valid_schema?(value)
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record.errors.add(attribute, "must be a valid json schema")
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end
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end
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private
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def valid_schema?(value)
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if draft_version > JSON_VALIDATOR_MAX_DRAFT_VERSION
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JSONSchemer.schema(Pathname.new(schema_path)).valid?(value)
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else
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JSON::Validator.validate(schema_path, value)
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end
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end
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def schema_path
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Rails.root.join('app', 'validators', 'json_schemas', "#{options[:filename]}.json").to_s
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end
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def draft_version
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options[:draft] || JSON_VALIDATOR_MAX_DRAFT_VERSION
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end
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end
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