Class: EventMachine::Protocols::SmtpClient

Inherits:
Connection
  • Object
show all
Includes:
Deferrable, LineText2
Defined in:
lib/em/protocols/smtpclient.rb

Overview

Simple SMTP client

email = EM::Protocols::SmtpClient.send(
  :domain=>"example.com",
  :host=>'localhost',
  :port=>25, # optional, defaults 25
  :starttls=>true, # use ssl
  :from=>"[email protected]",
  :to=> ["[email protected]", "[email protected]"],
  :header=> {"Subject" => "This is a subject line"},
  :body=> "This is the body of the email"
)
email.callback{
  puts 'Email sent!'
}
email.errback{ |e|
  puts 'Email failed!'
}

Constant Summary

Constants included from LineText2

LineText2::MaxBinaryLength, LineText2::MaxLineLength

Instance Attribute Summary collapse

Attributes inherited from Connection

#signature

Class Method Summary collapse

Instance Method Summary collapse

Methods included from LineText2

#receive_binary_data, #receive_data, #receive_end_of_binary_data, #set_binary_mode, #set_delimiter, #set_line_mode, #set_text_mode

Methods included from Deferrable

#callback, #cancel_timeout, #errback, #fail, future, #set_deferred_status, #succeed, #timeout

Methods inherited from Connection

#associate_callback_target, #close_connection, #close_connection_after_writing, #comm_inactivity_timeout, #comm_inactivity_timeout=, #detach, #error?, #get_outbound_data_size, #get_peer_cert, #get_peername, #get_pid, #get_sockname, #get_status, #initialize, new, #proxy_incoming_to, #proxy_target_unbound, #receive_data, #reconnect, #send_data, #send_datagram, #send_file_data, #set_comm_inactivity_timeout, #ssl_handshake_completed, #ssl_verify_peer, #start_tls, #stop_proxying, #stream_file_data

Constructor Details

This class inherits a constructor from EventMachine::Connection

Instance Attribute Details

#args=(value) ⇒ Object (writeonly)

:stopdoc:



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# File 'lib/em/protocols/smtpclient.rb', line 135

def args=(value)
  @args = value
end

Class Method Details

.send(args = {}) ⇒ Object

:host => required String

a string containing the IP address or host name of the SMTP server to connect to.

:port => optional

defaults to 25.

:domain => required String

This is passed as the argument to the EHLO command.

:starttls => optional Boolean

If it evaluates true, then the client will initiate STARTTLS with
the server, and abort the connection if the negotiation doesn't succeed.
TODO, need to be able to pass certificate parameters with this option.

:auth => optional Hash of auth parameters

If not given, then no auth will be attempted.
(In that case, the connection will be aborted if the server requires auth.)
Specify the hash value :type to determine the auth type, along with additional parameters
depending on the type.
Currently only :type => :plain is supported. Pass additional parameters :username (String),
and :password (either a String or a Proc that will be called at auth-time).
Example: :auth => {:type=>:plain, :username=>"[email protected]", :password=>"mouse"}

:from => required String

Specifies the sender of the message. Will be passed as the argument
to the MAIL FROM. Do NOT enclose the argument in angle-bracket (<>) characters.
The connection will abort if the server rejects the value.

:to => required String or Array of Strings

The recipient(s) of the message. Do NOT enclose
any of the values in angle-brackets (<>) characters. It's NOT a fatal error if one or more
recipients are rejected by the server. (Of course, if ALL of them are, the server will most
likely trigger an error when we try to send data.) An array of codes containing the status
of each requested recipient is available after the call completes. TODO, we should define
an overridable stub that will be called on rejection of a recipient or a sender, giving
user code the chance to try again or abort the connection.

:header => Required hash of values to be transmitted in the header of the message.

The hash keys are the names of the headers (do NOT append a trailing colon), and the values are strings
containing the header values. TODO, support Arrays of header values, which would cause us to
send that specific header line more than once.

Example: :header => {"Subject" => "Bogus", "CC" => "[email protected]"}

:body => Optional string, defaults blank.

This will be passed as the body of the email message.
TODO, this needs to be significantly beefed up. As currently written, this requires the caller
to properly format the input into CRLF-delimited lines of 7-bit characters in the standard
SMTP transmission format. We need to be able to automatically convert binary data, and add
correct line-breaks to text data. I think the :body parameter should remain as it is, and we
should add a :content parameter that contains autoconversions and/or conversion parameters.
Then we can check if either :body or :content is present and do the right thing.

:verbose => Optional.

If true, will cause a lot of information (including the server-side of the
conversation) to be dumped to $>.



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# File 'lib/em/protocols/smtpclient.rb', line 102

def self.send args={}
  args[:port] ||= 25
  args[:body] ||= ""

=begin
(I don't think it's possible for EM#connect to throw an exception under normal
circumstances, so this original code is stubbed out. A connect-failure will result
in the #unbind method being called without calling #connection_completed.)
begin
  EventMachine.connect( args[:host], args[:port], self) {|c|
    # According to the EM docs, we will get here AFTER post_init is called.
    c.args = args
    c.set_comm_inactivity_timeout 60
  }
rescue
  # We'll get here on a connect error. This code mimics the effect
  # of a call to invoke_internal_error. Would be great to DRY this up.
  # (Actually, it may be that we never get here, if EM#connect catches
  # its errors internally.)
  d = EM::DefaultDeferrable.new
  d.set_deferred_status(:failed, {:error=>[:connect, 500, "unable to connect to server"]})
  d
end
=end
  EventMachine.connect( args[:host], args[:port], self) {|c|
    # According to the EM docs, we will get here AFTER post_init is called.
    c.args = args
    c.set_comm_inactivity_timeout 60
  }
end

Instance Method Details

#connection_completed ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 142

def connection_completed
  @responder = :receive_signon
  @msg = []
end

#invoke_auth ⇒ Object

Perform an authentication. If the caller didn’t request one, then fall through to the mail-from state.



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# File 'lib/em/protocols/smtpclient.rb', line 230

def invoke_auth
  if @args[:auth]
    if @args[:auth][:type] == :plain
      psw = @args[:auth][:password]
      if psw.respond_to?(:call)
        psw = psw.call
      end
      #str = Base64::encode64("\0#{@args[:auth][:username]}\0#{psw}").chomp
      str = ["\0#{@args[:auth][:username]}\0#{psw}"].pack("m").chomp
      send_data "AUTH PLAIN #{str}\r\n"
      @responder = :receive_auth_response
    else
      return invoke_internal_error("unsupported auth type")
    end
  else
    invoke_mail_from
  end
end

#invoke_data ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 283

def invoke_data
  send_data "DATA\r\n"
  @responder = :receive_data_response
end

#invoke_error ⇒ Object

We encountered an error from the server and will close the connection. Use the error and message the server returned.



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# File 'lib/em/protocols/smtpclient.rb', line 177

def invoke_error
  @return_values.elapsed_time = Time.now - @return_values.start_time
  @return_values.responder = @responder
  @return_values.code = @code
  @return_values.message = @msg
  set_deferred_status :failed, @return_values
  send_data "QUIT\r\n"
  close_connection_after_writing
end

#invoke_internal_error(msg = "???") ⇒ Object

We encountered an error on our side of the protocol and will close the connection. Use an extra-protocol error code (900) and use the message from the caller.



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# File 'lib/em/protocols/smtpclient.rb', line 190

def invoke_internal_error msg = "???"
  @return_values.elapsed_time = Time.now - @return_values.start_time
  @return_values.responder = @responder
  @return_values.code = 900
  @return_values.message = msg
  set_deferred_status :failed, @return_values
  send_data "QUIT\r\n"
  close_connection_after_writing
end

#invoke_mail_from ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 253

def invoke_mail_from
  send_data "MAIL FROM: <#{@args[:from]}>\r\n"
  @responder = :receive_mail_from_response
end

#invoke_rcpt_to ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 262

def invoke_rcpt_to
  @rcpt_responses ||= []
  l = @rcpt_responses.length
  to = @args[:to].is_a?(Array) ? @args[:to] : [@args[:to].to_s]
  if l < to.length
    send_data "RCPT TO: <#{to[l]}>\r\n"
    @responder = :receive_rcpt_to_response
  else
    e = @rcpt_responses.select {|rr| rr.last == 2}
    if e and e.length > 0
      invoke_data
    else
      invoke_error
    end
  end
end

#invoke_starttls ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 212

def invoke_starttls
  if @args[:starttls]
    # It would be more sociable to first ask if @server_caps contains
    # the string "STARTTLS" before we invoke it, but hey, life's too short.
    send_data "STARTTLS\r\n"
    @responder = :receive_starttls_response
  else
    invoke_auth
  end
end

#post_init ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 137

def post_init
  @return_values = OpenStruct.new
  @return_values.start_time = Time.now
end

#receive_auth_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 248

def receive_auth_response
  return invoke_error unless @range == 2
  invoke_mail_from
end

#receive_data_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 287

def receive_data_response
  return invoke_error unless @range == 3

  # The data to send can be given either in @args[:content] (an array or string of raw data
  # which MUST be in correct SMTP body format, including a trailing dot line), or a header and
  # body given in @args[:header] and @args[:body].
  #
  if @args[:content]
    send_data @args[:content].to_s
  else
    # The header can be a hash or an array.
    if @args[:header].is_a?(Hash)
      (@args[:header] || {}).each {|k,v| send_data "#{k}: #{v}\r\n" }
    else
      send_data @args[:header].to_s
    end
    send_data "\r\n"

    if @args[:body].is_a?(Array)
      @args[:body].each {|e| send_data e}
    else
      send_data @args[:body].to_s
    end

    send_data "\r\n.\r\n"
  end

  @responder = :receive_message_response
end

#receive_ehlo_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 206

def receive_ehlo_response
  return invoke_error unless @range == 2
  @server_caps = @msg
  invoke_starttls
end

#receive_line(ln) ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 162

def receive_line ln
  $>.puts ln if @args[:verbose]
  @range = ln[0...1].to_i
  @code = ln[0...3].to_i
  @msg << ln[4..-1]
  unless ln[3...4] == '-'
    $>.puts @responder if @args[:verbose]
    send @responder
    @msg.clear
  end
end

#receive_mail_from_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 257

def receive_mail_from_response
  return invoke_error unless @range == 2
  invoke_rcpt_to
end

#receive_message_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 316

def receive_message_response
  return invoke_error unless @range == 2
  send_data "QUIT\r\n"
  close_connection_after_writing
  @succeeded = true
  @return_values.elapsed_time = Time.now - @return_values.start_time
  @return_values.responder = @responder
  @return_values.code = @code
  @return_values.message = @msg
  set_deferred_status :succeeded, @return_values
end

#receive_rcpt_to_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 278

def receive_rcpt_to_response
  @rcpt_responses << [@code, @msg, @range]
  invoke_rcpt_to
end

#receive_signon ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 200

def receive_signon
  return invoke_error unless @range == 2
  send_data "EHLO #{@args[:domain]}\r\n"
  @responder = :receive_ehlo_response
end

#receive_starttls_response ⇒ Object 



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# File 'lib/em/protocols/smtpclient.rb', line 222

def receive_starttls_response
  return invoke_error unless @range == 2
  start_tls
  invoke_auth
end

#unbind ⇒ Object

We can get here in a variety of ways, all of them being failures unless the @succeeded flag is set. If a protocol success was recorded, then don’t set a deferred success because the caller will already have done it (no need to wait until the connection closes to invoke the callbacks).



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# File 'lib/em/protocols/smtpclient.rb', line 152

def unbind
  unless @succeeded
    @return_values.elapsed_time = Time.now - @return_values.start_time
    @return_values.responder = @responder
    @return_values.code = @code
    @return_values.message = @msg
    set_deferred_status(:failed, @return_values)
  end
end