94 lines
2.9 KiB
Ruby
94 lines
2.9 KiB
Ruby
# frozen_string_literal: true
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# We 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 =
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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 =
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(SiteSetting.min_personal_message_post_length.to_f * ENTROPY_SCALE).to_i if entropy >
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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 >
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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 =
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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? && seems_meaningful? && seems_pronounceable? && seems_unpretentious? &&
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seems_quiet?
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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 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? ||
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(@text.split(%r{\s|/|-|\.|:}).map(&:size).max || 0) <= @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 ||
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@text != @text.mb_chars.upcase.to_s
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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 skipped_locale
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%w[zh_CN zh_TW ko ja].freeze
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end
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end
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