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