b4620f561c
The median username length is 8 characters. The 99% percentile is 18 characters. The 99.9% percentile is 24 characters. About 750 users have a name more than 24 characters long. This doesn't do anything about existing users with long usernames. Note that this is the length in Unicode codepoints, not grapheme clusters. Some Unicode characters and emoji may be a single glyph but composed of multiple codepoints.
21 lines
861 B
Ruby
21 lines
861 B
Ruby
# frozen_string_literal: true
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# Define a custom validator for user names.
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#
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# @example
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# validates :name, user_name: true
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#
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# @see https://guides.rubyonrails.org/active_record_validations.html#custom-validators
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class UserNameValidator < ActiveModel::EachValidator
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def validate_each(rec, attr, value)
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name = value
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rec.errors.add(attr, "already exists") if User.find_by_name(name).present?
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rec.errors.add(attr, "must be more than 1 character long") if name.length <= 1
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rec.errors.add(attr, "must be less than 25 characters long") if name.length >= 25
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rec.errors.add(attr, "cannot have whitespace or colons") if name =~ /[[:space:]]|:/
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rec.errors.add(attr, "cannot begin or end with an underscore") if name =~ /\A_|_\z/
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rec.errors.add(attr, "is not allowed") if name =~ Regexp.union(Danbooru.config.user_name_blacklist)
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end
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end
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