discourse/lib/slug.rb

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# encoding: utf-8
# frozen_string_literal: true
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module Slug
CHAR_FILTER_REGEXP = /[:\/\?#\[\]@!\$&'\(\)\*\+,;=_\.~%\\`^\s|\{\}"<>]+/ # :/?#[]@!$&'()*+,;=_.~%\`^|{}"<>
MAX_LENGTH = 255
def self.for(string, default = 'topic', max_length = MAX_LENGTH, method: nil)
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string = string.gsub(/:([\w\-+]+(?::t\d)?):/, '') if string.present? # strip emoji strings
method = (method || SiteSetting.slug_generation_method || :ascii).to_sym
max_length = 9999 if method == :encoded # do not truncate encoded slugs
slug =
case method
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when :ascii then self.ascii_generator(string)
when :encoded then self.encoded_generator(string)
when :none then self.none_generator(string)
end
slug = self.prettify_slug(slug, max_length: max_length)
(slug.blank? || slug_is_only_numbers?(slug)) ? default : slug
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end
private
def self.slug_is_only_numbers?(slug)
(slug =~ /[^\d]/).blank?
end
def self.prettify_slug(slug, max_length:)
# Reject slugs that only contain numbers, because they would be indistinguishable from id's.
slug = (slug_is_only_numbers?(slug) ? '' : slug)
slug
.tr("_", "-")
.truncate(max_length, omission: '')
.squeeze('-') # squeeze continuous dashes to prettify slug
.gsub(/\A-+|-+\z/, '') # remove possible trailing and preceding dashes
end
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def self.ascii_generator(string)
I18n.with_locale(SiteSetting.default_locale) do
string.tr("'", "").parameterize
end
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end
def self.encoded_generator(string, downcase: true)
# This generator will sanitize almost all special characters,
# including reserved characters from RFC3986.
# See also URI::REGEXP::PATTERN.
string = string.strip
.gsub(/\s+/, '-')
.gsub(CHAR_FILTER_REGEXP, '')
string = string.downcase if downcase
CGI.escape(string)
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end
def self.none_generator(string)
''
end
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end