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fab-manager/lib/file_size_validator.rb

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# frozen_string_literal: true
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# File size validator for CarrierWave
# https://github.com/jnicklas/carrierwave/wiki/How-to%3A-Validate-attachment-file-size
class FileSizeValidator < ActiveModel::EachValidator
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MESSAGES = { is: :wrong_size, minimum: :size_too_small, maximum: :size_too_big }.freeze
CHECKS = { is: :==, minimum: :>=, maximum: :<= }.freeze
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DEFAULT_TOKENIZER = ->(value) { value.split(//) }
RESERVED_OPTIONS = %i[minimum maximum within is tokenizer too_short too_long].freeze
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def initialize(options)
if range = (options.delete(:in) || options.delete(:within))
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raise ArgumentError, ':in and :within must be a Range' unless range.is_a?(Range)
options[:minimum] = range.begin
options[:maximum] = range.end
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options[:maximum] -= 1 if range.exclude_end?
end
super
end
def check_validity!
keys = CHECKS.keys & options.keys
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raise ArgumentError, 'Range unspecified. Specify the :within, :maximum, :minimum, or :is option.' if keys.empty?
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keys.each do |key|
value = options[key]
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raise ArgumentError, ":#{key} must be a nonnegative Integer" unless value.is_a?(Integer) && value >= 0
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end
end
def validate_each(record, attribute, value)
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raise(ArgumentError, 'A CarrierWave::Uploader::Base object was expected') unless value.is_a? CarrierWave::Uploader::Base
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value = (options[:tokenizer] || DEFAULT_TOKENIZER).call(value) if value.is_a?(String)
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CHECKS.each do |key, validity_check|
next unless check_value = options[key]
value ||= [] if key == :maximum
value_size = value.size
next if value_size.send(validity_check, check_value)
errors_options = options.except(*RESERVED_OPTIONS)
errors_options[:file_size] = help.number_to_human_size check_value
default_message = options[MESSAGES[key]]
errors_options[:message] ||= default_message if default_message
record.errors.add(attribute, MESSAGES[key], errors_options)
end
end
def help
Helper.instance
end
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# provides dependencies
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class Helper
include Singleton
include ActionView::Helpers::NumberHelper
end
end