discourse/lib/text_sentinel.rb

78 lines
2.2 KiB
Ruby

# frozen_string_literal: true
class TextSentinel
attr_accessor :text
ENTROPY_SCALE ||= 0.7
def initialize(text, opts = nil)
@opts = opts || {}
@text = text.to_s.encode("UTF-8", invalid: :replace, undef: :replace, replace: "")
end
def self.body_sentinel(text, opts = {})
entropy = SiteSetting.body_min_entropy
if opts[:private_message]
scale_entropy =
SiteSetting.min_personal_message_post_length.to_f / SiteSetting.min_post_length.to_f
entropy = (entropy * scale_entropy).to_i
entropy =
(SiteSetting.min_personal_message_post_length.to_f * ENTROPY_SCALE).to_i if entropy >
SiteSetting.min_personal_message_post_length
else
entropy = (SiteSetting.min_post_length.to_f * ENTROPY_SCALE).to_i if entropy >
SiteSetting.min_post_length
end
TextSentinel.new(text, min_entropy: entropy)
end
def self.title_sentinel(text)
entropy =
if SiteSetting.min_topic_title_length > SiteSetting.title_min_entropy
SiteSetting.title_min_entropy
else
(SiteSetting.min_topic_title_length.to_f * ENTROPY_SCALE).to_i
end
TextSentinel.new(text, min_entropy: entropy, max_word_length: SiteSetting.title_max_word_length)
end
# Number of unique bytes
def entropy
@entropy ||= @text.strip.bytes.uniq.size
end
def valid?
@text.present? && seems_meaningful? && seems_pronounceable? && seems_unpretentious? &&
seems_quiet?
end
# Ensure minumum entropy
def seems_meaningful?
@opts[:min_entropy].nil? || entropy >= @opts[:min_entropy]
end
# At least one non-symbol character
def seems_pronounceable?
@text.match?(/\p{Alnum}/)
end
# Ensure maximum word length
def seems_unpretentious?
skipped_locales.include?(SiteSetting.default_locale) || @opts[:max_word_length].nil? ||
!@text.match?(/\p{Alnum}{#{@opts[:max_word_length] + 1},}/)
end
# Ensure at least one lowercase letter
def seems_quiet?
SiteSetting.allow_uppercase_posts || @text.match?(/\p{Lowercase_Letter}|\p{Other_Letter}/) ||
!@text.match?(/\p{Letter}/)
end
private
# Hard to tell "word length" for CJK languages
def skipped_locales
@skipped_locales ||= %w[ja ko zh_CN zh_TW].freeze
end
end