require_dependency 'user' class UsernameValidator # Public: Perform the validation of a field in a given object # it adds the errors (if any) to the object that we're giving as parameter # # object - Object in which we're performing the validation # field_name - name of the field that we're validating # # Example: UsernameValidator.perform_validation(user, 'name') def self.perform_validation(object, field_name) validator = UsernameValidator.new(object.send(field_name)) unless validator.valid_format? validator.errors.each { |e| object.errors.add(field_name.to_sym, e) } end end 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? username_last_char_valid? username_no_double_special? username_does_not_end_with_confusing_suffix? errors.empty? end CONFUSING_EXTENSIONS ||= /\.(js|json|css|htm|html|xml|jpg|jpeg|png|gif|bmp|ico|tif|tiff|woff)$/i 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 =~ /[^\w.-]/ self.errors << I18n.t(:'user.username.characters') end end def username_first_char_valid? return unless errors.empty? if username[0] =~ /\W/ self.errors << I18n.t(:'user.username.must_begin_with_alphanumeric_or_underscore') end end def username_last_char_valid? return unless errors.empty? if username[-1] =~ /[^A-Za-z0-9]/ self.errors << I18n.t(:'user.username.must_end_with_alphanumeric') end end def username_no_double_special? return unless errors.empty? if username =~ /[-_.]{2,}/ self.errors << I18n.t(:'user.username.must_not_contain_two_special_chars_in_seq') end end def username_does_not_end_with_confusing_suffix? return unless errors.empty? if username =~ CONFUSING_EXTENSIONS self.errors << I18n.t(:'user.username.must_not_end_with_confusing_suffix') end end end