Class: SMTP

Inherits:
Object
  • Object
show all
Defined in:
lib/raw_smtp/smtp.rb

Overview

This is the main class that performs the connection.

Instance Method Summary collapse

Constructor Details

#initialize(server:, sending_server: "mail.example.com", mail_from: "[email protected]", mail_rcpt_to:, mail_headers: nil, mail_subject: "This is a test message", mail_body: "This is a test message.\nRegards,\nraw_smtp") ⇒ SMTP

  • server: server to attempt an SMTP connection to.

  • mail_from: sender, what to populate MAIL_FROM headers with.

  • mail_rcpt_to: recepient, what to populate RCPT_TO headers with.

  • mail_headers: custom headers. Need to be specified fully in a tabulated string format. Overrides all header parameters!

  • mail_subject: email subject to be inserted into headers.

  • mail_body: email body in a tabulated string format.



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# File 'lib/raw_smtp/smtp.rb', line 21

def initialize(server:,
               sending_server: "mail.example.com",
               mail_from: "[email protected]",
               mail_rcpt_to:,
               mail_headers: nil,
               mail_subject: "This is a test message",
               mail_body: "This is a test message.\nRegards,\nraw_smtp"
              )
  @server = server
  @sending_server = sending_server
  @mail_from = mail_from
  @mail_rcpt_to = mail_rcpt_to
  @mail_subject = mail_subject
  @mail_body = mail_body

  unless mail_headers
    @mail_headers = <<-EOH.gsub(/^\s+/, "")
    \tMIME-Version: 1.0
    \tMessage-ID:#{Digest::SHA2.hexdigest(Time.now.to_i.to_s)}@#{@sending_server}
    \tSubject: #{@mail_subject}
    \tFrom: #{@mail_from}
    \tTo: #{@mail_rcpt_to}
    \t
    EOH
  else
    @mail_headers = mail_headers
  end
end

Instance Method Details

#connect! ⇒ Object 



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# File 'lib/raw_smtp/smtp.rb', line 50

def connect!
  puts "Trying to open an SMTP session..."
  connection = TCPSocket.new @server, 25

  mail_data_chunk = @mail_headers + @mail_body + "\n."

  protocol_queue = [
    "EHLO #{@sending_server}",
    "MAIL FROM:<#{@mail_from}>",
    "RCPT TO:<#{@mail_rcpt_to}>",
    "DATA",
    "#{mail_data_chunk}",
    "QUIT"
  ]

  while message = protocol_queue.shift
    connection.puts(message)
    puts message
    sleep 1
    puts connection.recv(2048)
  end

  puts "Session closed."
  connection.close
end