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30990006a9
This reduces chances of errors where consumers of strings mutate inputs and reduces memory usage of the app. Test suite passes now, but there may be some stuff left, so we will run a few sites on a branch prior to merging
85 lines
2.3 KiB
Ruby
85 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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require_dependency 'screening_model'
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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.block(email, opts = {})
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find_by_email(Email.downcase(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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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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