discourse/app/models/screened_email.rb

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# frozen_string_literal: true
# A ScreenedEmail record represents an email address that is being watched,
# typically when creating a new User account. If the email of the signup form
# (or some other form) matches a ScreenedEmail record, an action can be
# performed based on the action_type.
class ScreenedEmail < ActiveRecord::Base
include ScreeningModel
default_action :block
validates :email, presence: true, uniqueness: true
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before_save :downcase_email
def downcase_email
self.email = email.downcase
end
def self.canonical(email)
name, domain = email.split('@', 2)
name = name.gsub(/\+.*/, '')
if ['gmail.com', 'googlemail.com'].include?(domain.downcase)
name = name.gsub('.', '')
end
"#{name}@#{domain}".downcase
end
def self.block(email, opts = {})
email = canonical(email)
find_by_email(email) || create!(opts.slice(:action_type, :ip_address).merge(email: email))
end
def self.should_block?(email)
email = canonical(email)
screened_emails = ScreenedEmail.order(created_at: :desc).limit(100)
distances = {}
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screened_emails.each { |se| distances[se.email] = levenshtein(se.email.downcase, email.downcase) }
max_distance = SiteSetting.levenshtein_distance_spammer_emails
screened_email = screened_emails.select { |se| distances[se.email] <= max_distance }
.sort { |se| distances[se.email] }
.first
screened_email.record_match! if screened_email
screened_email.try(:action_type) == actions[:block]
end
def self.levenshtein(first, second)
matrix = [(0..first.length).to_a]
(1..second.length).each do |j|
matrix << [j] + [0] * (first.length)
end
(1..second.length).each do |i|
(1..first.length).each do |j|
if first[j - 1] == second[i - 1]
matrix[i][j] = matrix[i - 1][j - 1]
else
matrix[i][j] = [
matrix[i - 1][j],
matrix[i][j - 1],
matrix[i - 1][j - 1],
].min + 1
end
end
end
matrix.last.last
end
end
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# == Schema Information
#
# Table name: screened_emails
#
# id :integer not null, primary key
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# email :string not null
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# action_type :integer not null
# match_count :integer default(0), not null
# last_match_at :datetime
# created_at :datetime not null
# updated_at :datetime not null
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# ip_address :inet
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#
# Indexes
#
# index_screened_emails_on_email (email) UNIQUE
# index_screened_emails_on_last_match_at (last_match_at)
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#