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