55 lines
1.5 KiB
Ruby
55 lines
1.5 KiB
Ruby
#
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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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def initialize(text, opts=nil)
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@opts = opts || {}
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@text = text.encode('UTF-8', invalid: :replace, undef: :replace, replace: '') if text.present?
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end
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def self.non_symbols_regexp
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/[\ -\/\[-\`\:-\@\{-\~]/m
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end
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def self.body_sentinel(text)
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TextSentinel.new(text, min_entropy: SiteSetting.body_min_entropy)
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end
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def self.title_sentinel(text)
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TextSentinel.new(text,
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min_entropy: SiteSetting.title_min_entropy,
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max_word_length: SiteSetting.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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def entropy
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return 0 if @text.blank?
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@entropy ||= @text.strip.each_char.to_a.uniq.size
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end
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def valid?
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# Blank strings are not valid
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return false if @text.blank? || @text.strip.blank?
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# Entropy check if required
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return false if @opts[:min_entropy].present? && (entropy < @opts[:min_entropy])
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# We don't have a comprehensive list of symbols, but this will eliminate some noise
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non_symbols = @text.gsub(TextSentinel.non_symbols_regexp, '').size
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return false if non_symbols == 0
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# Don't allow super long strings without spaces
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return false if @opts[:max_word_length] && @text =~ /\w{#{@opts[:max_word_length]},}(\s|$)/
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# We don't allow all upper case content in english
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return false if (@text =~ /[A-Z]+/) && (@text == @text.upcase)
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# It is valid
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true
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end
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end
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