discourse/app/models/username_validator.rb

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# frozen_string_literal: true
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)
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validator = UsernameValidator.new(object.public_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&.unicode_normalize
@errors = []
end
attr_accessor :errors
attr_reader :username
def user
@user ||= User.new(user)
end
def valid_format?
username_present?
username_length_min?
username_length_max?
username_char_valid?
username_char_allowed?
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)\z/i
MAX_CHARS ||= 60
ASCII_INVALID_CHAR_PATTERN ||= /[^\w.-]/
UNICODE_INVALID_CHAR_PATTERN ||= /[^\p{Alnum}\p{M}._-]/
INVALID_LEADING_CHAR_PATTERN ||= /\A[^\p{Alnum}\p{M}_]+/
INVALID_TRAILING_CHAR_PATTERN ||= /[^\p{Alnum}\p{M}]+\z/
REPEATED_SPECIAL_CHAR_PATTERN ||= /[-_.]{2,}/
private
def username_present?
return unless errors.empty?
self.errors << I18n.t(:"user.username.blank") if username.blank?
end
def username_length_min?
return unless errors.empty?
if username_grapheme_clusters.size < 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_grapheme_clusters.size > User.username_length.end
self.errors << I18n.t(:"user.username.long", max: User.username_length.end)
elsif username.length > MAX_CHARS
self.errors << I18n.t(:"user.username.too_long")
end
end
def username_char_valid?
return unless errors.empty?
if self.class.invalid_char_pattern.match?(username)
self.errors << I18n.t(:"user.username.characters")
end
end
def username_char_allowed?
return unless errors.empty? && self.class.char_allowlist_exists?
if username.chars.any? { |c| !self.class.allowed_char?(c) }
self.errors << I18n.t(:"user.username.characters")
end
end
def username_first_char_valid?
return unless errors.empty?
if INVALID_LEADING_CHAR_PATTERN.match?(username_grapheme_clusters.first)
self.errors << I18n.t(:"user.username.must_begin_with_alphanumeric_or_underscore")
end
end
def username_last_char_valid?
return unless errors.empty?
if INVALID_TRAILING_CHAR_PATTERN.match?(username_grapheme_clusters.last)
self.errors << I18n.t(:"user.username.must_end_with_alphanumeric")
end
end
def username_no_double_special?
return unless errors.empty?
if REPEATED_SPECIAL_CHAR_PATTERN.match?(username)
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 CONFUSING_EXTENSIONS.match?(username)
self.errors << I18n.t(:"user.username.must_not_end_with_confusing_suffix")
end
end
def username_grapheme_clusters
@username_grapheme_clusters ||= username.grapheme_clusters
end
def self.invalid_char_pattern
SiteSetting.unicode_usernames ? UNICODE_INVALID_CHAR_PATTERN : ASCII_INVALID_CHAR_PATTERN
end
def self.char_allowlist_exists?
SiteSetting.unicode_usernames && SiteSetting.allowed_unicode_username_characters.present?
end
def self.allowed_char?(c)
c.match?(/[\w.-]/) || c.match?(SiteSetting.allowed_unicode_username_characters_regex)
end
end