Retrospring/app/validators/typoed_email_validator.rb

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# frozen_string_literal: true
class TypoedEmailValidator < ActiveModel::EachValidator
# this array contains "forbidden" email address endings
INVALID_ENDINGS = [
# without @:
".carrd",
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".con",
".coom",
".cmo",
".mail",
# with @:
*%w[
fmail.com
gail.com
gamil.com
gemail.com
gmaik.com
gmail.cm
gmail.co
gmail.co.uk
gmaile.com
gmaill.com
gmali.com
gnail.com
hotamil.com
hotmai.com
hotmaill.com
iclooud.com
iclould.com
icluod.com
protonail.com
xn--gmail-xk1c.com
yahooo.com
gmail.com
].map { "@#{_1}" }
].freeze
def validate_each(record, attribute, value)
return if valid?(value)
record.errors.add(attribute, :typo, message: "contains a typo")
end
private
def valid?(value)
# needs an @
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return false unless value.include?("@")
# part after the @ needs to have at least one period
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return false if value.split("@", 2).last.count(".").zero?
# finally, common typos
return false if INVALID_ENDINGS.any? { value.end_with?(_1) }
true
end
end