discourse/lib/user_name_suggester.rb

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module UserNameSuggester
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GENERIC_NAMES = ['i', 'me', 'info', 'support', 'admin', 'webmaster', 'hello', 'mail', 'office', 'contact', 'team']
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def self.suggest(name, allow_username = nil)
return unless name.present?
name = parse_name_from_email(name)
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find_available_username_based_on(name, allow_username)
end
def self.parse_name_from_email(name)
if name =~ User::EMAIL
# When 'walter@white.com' take 'walter'
name = Regexp.last_match[1]
# When 'me@eviltrout.com' take 'eviltrout'
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name = Regexp.last_match[2] if GENERIC_NAMES.include?(name)
end
name
end
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def self.find_available_username_based_on(name, allow_username = nil)
name = fix_username(name)
i = 1
attempt = name
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until attempt == allow_username || User.username_available?(attempt) || i > 100
suffix = i.to_s
max_length = User.username_length.end - suffix.length - 1
attempt = "#{name[0..max_length]}#{suffix}"
i += 1
end
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until attempt == allow_username || User.username_available?(attempt) || i > 200
attempt = SecureRandom.hex[1..SiteSetting.max_username_length]
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i += 1
end
attempt
end
def self.fix_username(name)
rightsize_username(sanitize_username(name))
end
def self.sanitize_username(name)
name = ActiveSupport::Inflector.transliterate(name.to_s)
# 1. replace characters that aren't allowed with '_'
name.gsub!(UsernameValidator::CONFUSING_EXTENSIONS, "_")
name.gsub!(/[^\w.-]/, "_")
# 2. removes unallowed leading characters
name.gsub!(/^\W+/, "")
# 3. removes unallowed trailing characters
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name = remove_unallowed_trailing_characters(name)
# 4. unify special characters
name.gsub!(/[-_.]{2,}/, "_")
name
end
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def self.remove_unallowed_trailing_characters(name)
name.gsub!(/[^A-Za-z0-9]+$/, "")
name
end
def self.rightsize_username(name)
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name = name[0, User.username_length.end]
name = remove_unallowed_trailing_characters(name)
name.ljust(User.username_length.begin, '1')
end
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end