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30990006a9
This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging
91 lines
2.8 KiB
Ruby
91 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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# Whe use ActiveSupport mb_chars from here to properly support non ascii downcase
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# TODO remove when ruby 2.4 lands
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require 'active_support/core_ext/string/multibyte'
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#
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# Given a string, tell us whether or not is acceptable.
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#
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class TextSentinel
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attr_accessor :text
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ENTROPY_SCALE ||= 0.7
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def initialize(text, opts = nil)
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@opts = opts || {}
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@text = text.to_s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '')
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end
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def self.body_sentinel(text, opts = {})
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entropy = SiteSetting.body_min_entropy
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if opts[:private_message]
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scale_entropy = SiteSetting.min_personal_message_post_length.to_f / SiteSetting.min_post_length.to_f
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entropy = (entropy * scale_entropy).to_i
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entropy = (SiteSetting.min_personal_message_post_length.to_f * ENTROPY_SCALE).to_i if entropy > SiteSetting.min_personal_message_post_length
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else
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entropy = (SiteSetting.min_post_length.to_f * ENTROPY_SCALE).to_i if entropy > SiteSetting.min_post_length
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end
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TextSentinel.new(text, min_entropy: entropy)
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end
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def self.title_sentinel(text)
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entropy = if SiteSetting.min_topic_title_length > SiteSetting.title_min_entropy
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SiteSetting.title_min_entropy
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else
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(SiteSetting.min_topic_title_length.to_f * ENTROPY_SCALE).to_i
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end
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TextSentinel.new(text, min_entropy: entropy, max_word_length: SiteSetting.title_max_word_length)
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end
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# Entropy is a number of how many unique characters the string needs.
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# Non-ASCII characters are weighted heavier since they contain more "information"
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def entropy
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chars = @text.to_s.strip.split('')
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@entropy ||= chars.pack('M*' * chars.size).gsub("\n", '').split('=').uniq.size
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end
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def valid?
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@text.present? &&
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seems_meaningful? &&
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seems_pronounceable? &&
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seems_unpretentious? &&
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seems_quiet?
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end
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private
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def symbols_regex
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/[\ -\/\[-\`\:-\@\{-\~]/m
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end
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def seems_meaningful?
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# Minimum entropy if entropy check required
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@opts[:min_entropy].blank? || (entropy >= @opts[:min_entropy])
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end
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def seems_pronounceable?
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# At least some non-symbol characters
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# (We don't have a comprehensive list of symbols, but this will eliminate some noise)
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@text.gsub(symbols_regex, '').size > 0
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end
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def skipped_locale
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%w(zh_CN zh_TW ko ja).freeze
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end
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def seems_unpretentious?
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return true if skipped_locale.include?(SiteSetting.default_locale)
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# Don't allow super long words if there is a word length maximum
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@opts[:max_word_length].blank? || @text.split(/\s|\/|-|\.|:/).map(&:size).max <= @opts[:max_word_length]
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end
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def seems_quiet?
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return true if skipped_locale.include?(SiteSetting.default_locale)
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# We don't allow all upper case content
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SiteSetting.allow_uppercase_posts || @text == @text.mb_chars.downcase.to_s || @text != @text.mb_chars.upcase.to_s
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end
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end
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