discourse/app/models/username_validator.rb

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class UsernameValidator
def initialize(username)
@username = username
@errors = []
end
attr_accessor :errors
attr_reader :username
def user
@user ||= User.new(user)
end
def valid_format?
username_exist?
username_length_min?
username_length_max?
username_char_valid?
username_first_char_valid?
errors.empty?
end
private
def username_exist?
return unless errors.empty?
unless username
self.errors << I18n.t(:'user.username.blank')
end
end
def username_length_min?
return unless errors.empty?
if username.length < User.username_length.begin
self.errors << I18n.t(:'user.username.short', min: User.username_length.begin)
end
end
def username_length_max?
return unless errors.empty?
if username.length > User.username_length.end
self.errors << I18n.t(:'user.username.long', max: User.username_length.end)
end
end
def username_char_valid?
return unless errors.empty?
if username =~ /[^A-Za-z0-9_]/
self.errors << I18n.t(:'user.username.characters')
end
end
def username_first_char_valid?
return unless errors.empty?
if username[0,1] =~ /[^A-Za-z0-9]/
self.errors << I18n.t(:'user.username.must_begin_with_alphanumeric')
end
end
end