Class: As2::Server

Inherits:
Object
  • Object
show all
Defined in:
lib/as2/server.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(server_info: nil, partner: nil, on_signature_failure: nil, &block) ⇒ Server 



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# File 'lib/as2/server.rb', line 17

def initialize(server_info: nil, partner: nil, on_signature_failure: nil, &block)
  @block = block
  @server_info = server_info || Config.server_info
  @partner = partner
  @signature_failure_handler = on_signature_failure
end

Instance Attribute Details

#logger=(value) ⇒ Object

Sets the attribute logger



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# File 'lib/as2/server.rb', line 9

def logger=(value)
  @logger = value
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/as2/server.rb', line 24

def call(env)
  if env['HTTP_AS2_TO'] != @server_info.name
    return send_error(env, "Invalid destination name #{env['HTTP_AS2_TO']}")
  end

  partner = @partner || Config.partners[env['HTTP_AS2_FROM']]

  if !partner || env['HTTP_AS2_FROM'] != partner.name
    return send_error(env, "Invalid partner name #{env['HTTP_AS2_FROM']}")
  end

  request = Rack::Request.new(env)
  message = Message.new(request.body.read, @server_info.pkey, @server_info.certificate)

  unless message.valid_signature?(partner.certificate)
    if @signature_failure_handler
      @signature_failure_handler.call({
        env: env,
        smime_string: message.decrypted_message,
        verification_error: message.verification_error
      })
    else
      raise "Could not verify signature"
    end
  end

  if @block
    begin
      @block.call message.attachment.filename, message.attachment.body
    rescue Exception => e
      return send_error(env, e.message)
    end
  end

  send_mdn(env, message.mic, message.mic_algorithm)
end

#send_mdn(env, mic, mic_algorithm, failed = nil) ⇒ Object 



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# File 'lib/as2/server.rb', line 61

def send_mdn(env, mic, mic_algorithm, failed = nil)
  # rules for MDN construction are covered in
  # https://datatracker.ietf.org/doc/html/rfc4130#section-7.4.2

  options = {
    'Reporting-UA' => @server_info.name,
    'Original-Recipient' => "rfc822; #{@server_info.name}",
    'Final-Recipient' => "rfc822; #{@server_info.name}",
    'Original-Message-ID' => env['HTTP_MESSAGE_ID']
  }
  if failed
    options['Disposition'] = 'automatic-action/MDN-sent-automatically; failed'
    options['Failure'] = failed
    text_body = "There was an error with the AS2 transmission.\r\n\r\n#{failed}"
  else
    options['Disposition'] = 'automatic-action/MDN-sent-automatically; processed'
    text_body = "The AS2 message has been received successfully"
  end
  options['Received-Content-MIC'] = "#{mic}, #{mic_algorithm}" if mic

  report = MimeGenerator::Part.new
  report['Content-Type'] = 'multipart/report; report-type=disposition-notification'

  text = MimeGenerator::Part.new
  text['Content-Type'] = 'text/plain'
  text['Content-Transfer-Encoding'] = '7bit'
  text.body = text_body
  report.add_part text

  notification = MimeGenerator::Part.new
  notification['Content-Type'] = 'message/disposition-notification'
  notification['Content-Transfer-Encoding'] = '7bit'
  notification.body = options.map{|n, v| "#{n}: #{v}"}.join("\r\n")
  report.add_part notification

  msg_out = StringIO.new

  report.write msg_out

  pkcs7 = OpenSSL::PKCS7.sign @server_info.certificate, @server_info.pkey, msg_out.string
  pkcs7.detached = true
  smime_signed = OpenSSL::PKCS7.write_smime pkcs7, msg_out.string

  content_type = smime_signed[/^Content-Type: (.+?)$/m, 1]
  # smime_signed.sub!(/\A.+?^(?=---)/m, '')

  headers = {}
  headers['Content-Type'] = content_type
  # TODO: if MIME-Version header is actually needed, should extract it out of smime_signed.
  headers['MIME-Version'] = '1.0'
  headers['Message-ID'] = As2.generate_message_id(@server_info)
  headers['AS2-From'] = @server_info.name
  headers['AS2-To'] = env['HTTP_AS2_FROM']
  headers['AS2-Version'] = '1.0'
  headers['Connection'] = 'close'

  [200, headers, ["\r\n" + smime_signed]]
end