78 lines
2.2 KiB
Ruby
78 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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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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# Number of unique bytes
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def entropy
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@entropy ||= @text.strip.bytes.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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# Ensure minumum entropy
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def seems_meaningful?
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@opts[:min_entropy].nil? || entropy >= @opts[:min_entropy]
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end
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# At least one non-symbol character
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def seems_pronounceable?
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@text.match?(/\p{Alnum}/)
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end
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# Ensure maximum word length
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def seems_unpretentious?
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skipped_locales.include?(SiteSetting.default_locale) || @opts[:max_word_length].nil? ||
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!@text.match?(/\p{Alnum}{#{@opts[:max_word_length] + 1},}/)
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end
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# Ensure at least one lowercase letter
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def seems_quiet?
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SiteSetting.allow_uppercase_posts || @text.match?(/\p{Lowercase_Letter}|\p{Other_Letter}/) ||
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!@text.match?(/\p{Letter}/)
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end
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private
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# Hard to tell "word length" for CJK languages
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def skipped_locales
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@skipped_locales ||= %w[ja ko zh_CN zh_TW].freeze
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end
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end
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