Class: EmailVerifier::Checker

Inherits:
Object
  • Object
show all
Defined in:
lib/email_verifier/checker.rb

Instance Method Summary collapse

Constructor Details

#initialize(address) ⇒ Checker

Returns server object for given email address or throws exception Object returned isn’t yet connected. It has internally a list of real mail servers got from MX dns lookup

Raises:



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# File 'lib/email_verifier/checker.rb', line 9

def initialize(address)
  @email   = address
  _, @domain  = address.split("@")
  @servers = list_mxs @domain
  raise EmailVerifier::NoMailServerException.new("No mail server for #{address}") if @servers.empty?
  @smtp    = nil

  # this is because some mail servers won't give any info unless 
  # a real user asks for it:
  @user_email = EmailVerifier.config.verifier_email
  _, @user_domain = @user_email.split "@"
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 35

def connect
  begin
    server = next_server
    raise EmailVerifier::OutOfMailServersException.new("Unable to connect to any one of mail servers for #{@email}") if server.nil?
    @smtp = Net::SMTP.start server[:address], 25, @user_domain
    return true
  rescue EmailVerifier::OutOfMailServersException => e
    raise EmailVerifier::OutOfMailServersException, e.message
  rescue => e
    retry
  end
end

#ensure_250(smtp_return) ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 81

def ensure_250(smtp_return)
  if smtp_return.status.to_i == 250
    return true
  else
    raise EmailVerifier::FailureException.new "Mail server responded with #{smtp_return.status} when we were expecting 250"
  end
end

#ensure_connected ⇒ Object

Raises:



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# File 'lib/email_verifier/checker.rb', line 77

def ensure_connected
  raise EmailVerifier::NotConnectedException.new("You have to connect first") if @smtp.nil?
end

#is_connected ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 31

def is_connected
  !@smtp.nil?
end

#list_mxs(domain) ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 22

def list_mxs(domain)
  return [] unless domain
  `host -t MX #{domain}`.scan(/(?<=by ).+/).map do |mx| 
    res = mx.split(" ")
    next if res.last[0..-2].strip.empty?
    { priority: res.first.to_i, address: res.last[0..-2] }
  end.reject(&:nil?).sort_by { |mx| mx[:priority] }
end

#mailfrom(address) ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 57

def mailfrom(address)
  ensure_connected

  ensure_250 @smtp.mailfrom(address)
end

#next_server ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 48

def next_server
  @servers.shift
end

#rcptto(address) ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 63

def rcptto(address)
  ensure_connected
 
  begin
    ensure_250 @smtp.rcptto(address)
  rescue => e
    if e.message[/^550/]
      return false
    else
      raise EmailVerifier::FailureException.new(e.message)
    end
  end
end

#verify ⇒ Object 



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# File 'lib/email_verifier/checker.rb', line 52

def verify
  self.mailfrom @user_email
  self.rcptto(@email)
end