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']
def self.suggest(name_or_email, allowed_username = nil)
return unless name_or_email.present?
name = parse_name_from_email(name_or_email)
find_available_username_based_on(name, allowed_username)
end
def self.parse_name_from_email(name_or_email)
return name_or_email if name_or_email !~ User::EMAIL
# When 'walter@white.com' take 'walter'
name = Regexp.last_match[1]
# When 'me@eviltrout.com' take 'eviltrout'
name = Regexp.last_match[2] if GENERIC_NAMES.include?(name)
name
end
def self.find_available_username_based_on(name, allowed_username = nil)
name = fix_username(name)
i = 1
attempt = name
until attempt == allowed_username || User.username_available?(attempt) || i > 100
suffix = i.to_s
max_length = User.username_length.end - suffix.length
attempt = "#{truncate(name, max_length)}#{suffix}"
i += 1
end
until attempt == allowed_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 = name.to_s
if SiteSetting.unicode_usernames
name.unicode_normalize!
else
name = ActiveSupport::Inflector.transliterate(name)
end
name.gsub!(UsernameValidator.invalid_char_pattern, '_')
name.chars.map! { |c| UsernameValidator.whitelisted_char?(c) ? c : '_' } if UsernameValidator.char_whitelist_exists?
name.gsub!(UsernameValidator::INVALID_LEADING_CHAR_PATTERN, '')
name.gsub!(UsernameValidator::CONFUSING_EXTENSIONS, "_")
name.gsub!(UsernameValidator::INVALID_TRAILING_CHAR_PATTERN, '')
name.gsub!(UsernameValidator::REPEATED_SPECIAL_CHAR_PATTERN, '_')
name
end
def self.rightsize_username(name)
name = truncate(name, User.username_length.end)
name.gsub!(UsernameValidator::INVALID_TRAILING_CHAR_PATTERN, '')
missing_char_count = User.username_length.begin - name.grapheme_clusters.size
name << '1' * missing_char_count if missing_char_count > 0
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name
end
def self.truncate(name, max_grapheme_clusters)
clusters = name.grapheme_clusters
if clusters.size > max_grapheme_clusters
clusters = clusters[0..max_grapheme_clusters - 1]
name = clusters.join
end
while name.length > UsernameValidator::MAX_CHARS
clusters.pop
name = clusters.join
end
name
end
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end