text: import unittest
  import textwrap
  from test import support, mock_socket
  from test.support import socket_helper
  from test.support import warnings_helper
  import socket
  import io
  
  
  smtpd = warnings_helper.import_deprecated('smtpd')
  asyncore = warnings_helper.import_deprecated('asyncore')
  
  
  class DummyServer(smtpd.SMTPServer):
      def __init__(self, *args, **kwargs):
          smtpd.SMTPServer.__init__(self, *args, **kwargs)
          self.messages = []
          if self._decode_data:
              self.return_status = 'return status'
          else:
              self.return_status = b'return status'
  
      def process_message(self, peer, mailfrom, rcpttos, data, **kw):
          self.messages.append((peer, mailfrom, rcpttos, data))
          if data == self.return_status:
              return '250 Okish'
          if 'mail_options' in kw and 'SMTPUTF8' in kw['mail_options']:
              return '250 SMTPUTF8 message okish'
  
  
  class DummyDispatcherBroken(Exception):
      pass
  
  
  class BrokenDummyServer(DummyServer):
      def listen(self, num):
          raise DummyDispatcherBroken()
  
  
  class SMTPDServerTest(unittest.TestCase):
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
  
      def test_process_message_unimplemented(self):
          server = smtpd.SMTPServer((socket_helper.HOST, 0), ('b', 0),
                                    decode_data=True)
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr, decode_data=True)
  
          def write_line(line):
              channel.socket.queue_recv(line)
              channel.handle_read()
  
          write_line(b'HELO example')
          write_line(b'MAIL From:eggs@example')
          write_line(b'RCPT To:spam@example')
          write_line(b'DATA')
          self.assertRaises(NotImplementedError, write_line, b'spam\r\n.\r\n')
  
      def test_decode_data_and_enable_SMTPUTF8_raises(self):
          self.assertRaises(
              ValueError,
              smtpd.SMTPServer,
              (socket_helper.HOST, 0),
              ('b', 0),
              enable_SMTPUTF8=True,
              decode_data=True)
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
  
  
  class DebuggingServerTest(unittest.TestCase):
  
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
  
      def send_data(self, channel, data, enable_SMTPUTF8=False):
          def write_line(line):
              channel.socket.queue_recv(line)
              channel.handle_read()
          write_line(b'EHLO example')
          if enable_SMTPUTF8:
              write_line(b'MAIL From:eggs@example BODY=8BITMIME SMTPUTF8')
          else:
              write_line(b'MAIL From:eggs@example')
          write_line(b'RCPT To:spam@example')
          write_line(b'DATA')
          write_line(data)
          write_line(b'.')
  
      def test_process_message_with_decode_data_true(self):
          server = smtpd.DebuggingServer((socket_helper.HOST, 0), ('b', 0),
                                         decode_data=True)
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr, decode_data=True)
          with support.captured_stdout() as s:
              self.send_data(channel, b'From: test\n\nhello\n')
          stdout = s.getvalue()
          self.assertEqual(stdout, textwrap.dedent("""\
               ---------- MESSAGE FOLLOWS ----------
               From: test
               X-Peer: peer-address
  
               hello
               ------------ END MESSAGE ------------
               """))
  
      def test_process_message_with_decode_data_false(self):
          server = smtpd.DebuggingServer((socket_helper.HOST, 0), ('b', 0))
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr)
          with support.captured_stdout() as s:
              self.send_data(channel, b'From: test\n\nh\xc3\xa9llo\xff\n')
          stdout = s.getvalue()
          self.assertEqual(stdout, textwrap.dedent("""\
               ---------- MESSAGE FOLLOWS ----------
               b'From: test'
               b'X-Peer: peer-address'
               b''
               b'h\\xc3\\xa9llo\\xff'
               ------------ END MESSAGE ------------
               """))
  
      def test_process_message_with_enable_SMTPUTF8_true(self):
          server = smtpd.DebuggingServer((socket_helper.HOST, 0), ('b', 0),
                                         enable_SMTPUTF8=True)
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr, enable_SMTPUTF8=True)
          with support.captured_stdout() as s:
              self.send_data(channel, b'From: test\n\nh\xc3\xa9llo\xff\n')
          stdout = s.getvalue()
          self.assertEqual(stdout, textwrap.dedent("""\
               ---------- MESSAGE FOLLOWS ----------
               b'From: test'
               b'X-Peer: peer-address'
               b''
               b'h\\xc3\\xa9llo\\xff'
               ------------ END MESSAGE ------------
               """))
  
      def test_process_SMTPUTF8_message_with_enable_SMTPUTF8_true(self):
          server = smtpd.DebuggingServer((socket_helper.HOST, 0), ('b', 0),
                                         enable_SMTPUTF8=True)
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr, enable_SMTPUTF8=True)
          with support.captured_stdout() as s:
              self.send_data(channel, b'From: test\n\nh\xc3\xa9llo\xff\n',
                             enable_SMTPUTF8=True)
          stdout = s.getvalue()
          self.assertEqual(stdout, textwrap.dedent("""\
               ---------- MESSAGE FOLLOWS ----------
               mail options: ['BODY=8BITMIME', 'SMTPUTF8']
               b'From: test'
               b'X-Peer: peer-address'
               b''
               b'h\\xc3\\xa9llo\\xff'
               ------------ END MESSAGE ------------
               """))
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
  
  
  class TestFamilyDetection(unittest.TestCase):
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
  
      @unittest.skipUnless(socket_helper.IPV6_ENABLED, "IPv6 not enabled")
      def test_socket_uses_IPv6(self):
          server = smtpd.SMTPServer((socket_helper.HOSTv6, 0), (socket_helper.HOSTv4, 0))
          self.assertEqual(server.socket.family, socket.AF_INET6)
  
      def test_socket_uses_IPv4(self):
          server = smtpd.SMTPServer((socket_helper.HOSTv4, 0), (socket_helper.HOSTv6, 0))
          self.assertEqual(server.socket.family, socket.AF_INET)
  
  
  class TestRcptOptionParsing(unittest.TestCase):
      error_response = (b'555 RCPT TO parameters not recognized or not '
                        b'implemented\r\n')
  
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, channel, line):
          channel.socket.queue_recv(line)
          channel.handle_read()
  
      def test_params_rejected(self):
          server = DummyServer((socket_helper.HOST, 0), ('b', 0))
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr)
          self.write_line(channel, b'EHLO example')
          self.write_line(channel, b'MAIL from: <foo@example.com> size=20')
          self.write_line(channel, b'RCPT to: <foo@example.com> foo=bar')
          self.assertEqual(channel.socket.last, self.error_response)
  
      def test_nothing_accepted(self):
          server = DummyServer((socket_helper.HOST, 0), ('b', 0))
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr)
          self.write_line(channel, b'EHLO example')
          self.write_line(channel, b'MAIL from: <foo@example.com> size=20')
          self.write_line(channel, b'RCPT to: <foo@example.com>')
          self.assertEqual(channel.socket.last, b'250 OK\r\n')
  
  
  class TestMailOptionParsing(unittest.TestCase):
      error_response = (b'555 MAIL FROM parameters not recognized or not '
                        b'implemented\r\n')
  
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, channel, line):
          channel.socket.queue_recv(line)
          channel.handle_read()
  
      def test_with_decode_data_true(self):
          server = DummyServer((socket_helper.HOST, 0), ('b', 0), decode_data=True)
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr, decode_data=True)
          self.write_line(channel, b'EHLO example')
          for line in [
              b'MAIL from: <foo@example.com> size=20 SMTPUTF8',
              b'MAIL from: <foo@example.com> size=20 SMTPUTF8 BODY=8BITMIME',
              b'MAIL from: <foo@example.com> size=20 BODY=UNKNOWN',
              b'MAIL from: <foo@example.com> size=20 body=8bitmime',
          ]:
              self.write_line(channel, line)
              self.assertEqual(channel.socket.last, self.error_response)
          self.write_line(channel, b'MAIL from: <foo@example.com> size=20')
          self.assertEqual(channel.socket.last, b'250 OK\r\n')
  
      def test_with_decode_data_false(self):
          server = DummyServer((socket_helper.HOST, 0), ('b', 0))
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr)
          self.write_line(channel, b'EHLO example')
          for line in [
              b'MAIL from: <foo@example.com> size=20 SMTPUTF8',
              b'MAIL from: <foo@example.com> size=20 SMTPUTF8 BODY=8BITMIME',
          ]:
              self.write_line(channel, line)
              self.assertEqual(channel.socket.last, self.error_response)
          self.write_line(
              channel,
              b'MAIL from: <foo@example.com> size=20 SMTPUTF8 BODY=UNKNOWN')
          self.assertEqual(
              channel.socket.last,
              b'501 Error: BODY can only be one of 7BIT, 8BITMIME\r\n')
          self.write_line(
              channel, b'MAIL from: <foo@example.com> size=20 body=8bitmime')
          self.assertEqual(channel.socket.last, b'250 OK\r\n')
  
      def test_with_enable_smtputf8_true(self):
          server = DummyServer((socket_helper.HOST, 0), ('b', 0), enable_SMTPUTF8=True)
          conn, addr = server.accept()
          channel = smtpd.SMTPChannel(server, conn, addr, enable_SMTPUTF8=True)
          self.write_line(channel, b'EHLO example')
          self.write_line(
              channel,
              b'MAIL from: <foo@example.com> size=20 body=8bitmime smtputf8')
          self.assertEqual(channel.socket.last, b'250 OK\r\n')
  
  
  class SMTPDChannelTest(unittest.TestCase):
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
          self.server = DummyServer((socket_helper.HOST, 0), ('b', 0),
                                    decode_data=True)
          conn, addr = self.server.accept()
          self.channel = smtpd.SMTPChannel(self.server, conn, addr,
                                           decode_data=True)
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, line):
          self.channel.socket.queue_recv(line)
          self.channel.handle_read()
  
      def test_broken_connect(self):
          self.assertRaises(
              DummyDispatcherBroken, BrokenDummyServer,
              (socket_helper.HOST, 0), ('b', 0), decode_data=True)
  
      def test_decode_data_and_enable_SMTPUTF8_raises(self):
          self.assertRaises(
              ValueError, smtpd.SMTPChannel,
              self.server, self.channel.conn, self.channel.addr,
              enable_SMTPUTF8=True, decode_data=True)
  
      def test_server_accept(self):
          self.server.handle_accept()
  
      def test_missing_data(self):
          self.write_line(b'')
          self.assertEqual(self.channel.socket.last,
                           b'500 Error: bad syntax\r\n')
  
      def test_EHLO(self):
          self.write_line(b'EHLO example')
          self.assertEqual(self.channel.socket.last, b'250 HELP\r\n')
  
      def test_EHLO_bad_syntax(self):
          self.write_line(b'EHLO')
          self.assertEqual(self.channel.socket.last,
                           b'501 Syntax: EHLO hostname\r\n')
  
      def test_EHLO_duplicate(self):
          self.write_line(b'EHLO example')
          self.write_line(b'EHLO example')
          self.assertEqual(self.channel.socket.last,
                           b'503 Duplicate HELO/EHLO\r\n')
  
      def test_EHLO_HELO_duplicate(self):
          self.write_line(b'EHLO example')
          self.write_line(b'HELO example')
          self.assertEqual(self.channel.socket.last,
                           b'503 Duplicate HELO/EHLO\r\n')
  
      def test_HELO(self):
          name = smtpd.socket.getfqdn()
          self.write_line(b'HELO example')
          self.assertEqual(self.channel.socket.last,
                           '250 {}\r\n'.format(name).encode('ascii'))
  
      def test_HELO_EHLO_duplicate(self):
          self.write_line(b'HELO example')
          self.write_line(b'EHLO example')
          self.assertEqual(self.channel.socket.last,
                           b'503 Duplicate HELO/EHLO\r\n')
  
      def test_HELP(self):
          self.write_line(b'HELP')
          self.assertEqual(self.channel.socket.last,
                           b'250 Supported commands: EHLO HELO MAIL RCPT ' + \
                           b'DATA RSET NOOP QUIT VRFY\r\n')
  
      def test_HELP_command(self):
          self.write_line(b'HELP MAIL')
          self.assertEqual(self.channel.socket.last,
                           b'250 Syntax: MAIL FROM: <address>\r\n')
  
      def test_HELP_command_unknown(self):
          self.write_line(b'HELP SPAM')
          self.assertEqual(self.channel.socket.last,
                           b'501 Supported commands: EHLO HELO MAIL RCPT ' + \
                           b'DATA RSET NOOP QUIT VRFY\r\n')
  
      def test_HELO_bad_syntax(self):
          self.write_line(b'HELO')
          self.assertEqual(self.channel.socket.last,
                           b'501 Syntax: HELO hostname\r\n')
  
      def test_HELO_duplicate(self):
          self.write_line(b'HELO example')
          self.write_line(b'HELO example')
          self.assertEqual(self.channel.socket.last,
                           b'503 Duplicate HELO/EHLO\r\n')
  
      def test_HELO_parameter_rejected_when_extensions_not_enabled(self):
          self.extended_smtp = False
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from:<foo@example.com> SIZE=1234')
          self.assertEqual(self.channel.socket.last,
                           b'501 Syntax: MAIL FROM: <address>\r\n')
  
      def test_MAIL_allows_space_after_colon(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from:   <foo@example.com>')
          self.assertEqual(self.channel.socket.last,
                           b'250 OK\r\n')
  
      def test_extended_MAIL_allows_space_after_colon(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from:   <foo@example.com> size=20')
          self.assertEqual(self.channel.socket.last,
                           b'250 OK\r\n')
  
      def test_NOOP(self):
          self.write_line(b'NOOP')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_HELO_NOOP(self):
          self.write_line(b'HELO example')
          self.write_line(b'NOOP')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_NOOP_bad_syntax(self):
          self.write_line(b'NOOP hi')
          self.assertEqual(self.channel.socket.last,
                           b'501 Syntax: NOOP\r\n')
  
      def test_QUIT(self):
          self.write_line(b'QUIT')
          self.assertEqual(self.channel.socket.last, b'221 Bye\r\n')
  
      def test_HELO_QUIT(self):
          self.write_line(b'HELO example')
          self.write_line(b'QUIT')
          self.assertEqual(self.channel.socket.last, b'221 Bye\r\n')
  
      def test_QUIT_arg_ignored(self):
          self.write_line(b'QUIT bye bye')
          self.assertEqual(self.channel.socket.last, b'221 Bye\r\n')
  
      def test_bad_state(self):
          self.channel.smtp_state = 'BAD STATE'
          self.write_line(b'HELO example')
          self.assertEqual(self.channel.socket.last,
                           b'451 Internal confusion\r\n')
  
      def test_command_too_long(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from: ' +
                          b'a' * self.channel.command_size_limit +
                          b'@example')
          self.assertEqual(self.channel.socket.last,
                           b'500 Error: line too long\r\n')
  
      def test_MAIL_command_limit_extended_with_SIZE(self):
          self.write_line(b'EHLO example')
          fill_len = self.channel.command_size_limit - len('MAIL from:<@example>')
          self.write_line(b'MAIL from:<' +
                          b'a' * fill_len +
                          b'@example> SIZE=1234')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
          self.write_line(b'MAIL from:<' +
                          b'a' * (fill_len + 26) +
                          b'@example> SIZE=1234')
          self.assertEqual(self.channel.socket.last,
                           b'500 Error: line too long\r\n')
  
      def test_MAIL_command_rejects_SMTPUTF8_by_default(self):
          self.write_line(b'EHLO example')
          self.write_line(
              b'MAIL from: <naive@example.com> BODY=8BITMIME SMTPUTF8')
          self.assertEqual(self.channel.socket.last[0:1], b'5')
  
      def test_data_longer_than_default_data_size_limit(self):
          # Hack the default so we don't have to generate so much data.
          self.channel.data_size_limit = 1048
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'A' * self.channel.data_size_limit +
                          b'A\r\n.')
          self.assertEqual(self.channel.socket.last,
                           b'552 Error: Too much mail data\r\n')
  
      def test_MAIL_size_parameter(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL FROM:<eggs@example> SIZE=512')
          self.assertEqual(self.channel.socket.last,
                           b'250 OK\r\n')
  
      def test_MAIL_invalid_size_parameter(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL FROM:<eggs@example> SIZE=invalid')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: MAIL FROM: <address> [SP <mail-parameters>]\r\n')
  
      def test_MAIL_RCPT_unknown_parameters(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL FROM:<eggs@example> ham=green')
          self.assertEqual(self.channel.socket.last,
              b'555 MAIL FROM parameters not recognized or not implemented\r\n')
  
          self.write_line(b'MAIL FROM:<eggs@example>')
          self.write_line(b'RCPT TO:<eggs@example> ham=green')
          self.assertEqual(self.channel.socket.last,
              b'555 RCPT TO parameters not recognized or not implemented\r\n')
  
      def test_MAIL_size_parameter_larger_than_default_data_size_limit(self):
          self.channel.data_size_limit = 1048
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL FROM:<eggs@example> SIZE=2096')
          self.assertEqual(self.channel.socket.last,
              b'552 Error: message size exceeds fixed maximum message size\r\n')
  
      def test_need_MAIL(self):
          self.write_line(b'HELO example')
          self.write_line(b'RCPT to:spam@example')
          self.assertEqual(self.channel.socket.last,
              b'503 Error: need MAIL command\r\n')
  
      def test_MAIL_syntax_HELO(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from eggs@example')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: MAIL FROM: <address>\r\n')
  
      def test_MAIL_syntax_EHLO(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from eggs@example')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: MAIL FROM: <address> [SP <mail-parameters>]\r\n')
  
      def test_MAIL_missing_address(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from:')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: MAIL FROM: <address>\r\n')
  
      def test_MAIL_chevrons(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from:<eggs@example>')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_MAIL_empty_chevrons(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from:<>')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_MAIL_quoted_localpart(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from: <"Fred Blogs"@example.com>')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
  
      def test_MAIL_quoted_localpart_no_angles(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from: "Fred Blogs"@example.com')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
  
      def test_MAIL_quoted_localpart_with_size(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from: <"Fred Blogs"@example.com> SIZE=1000')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
  
      def test_MAIL_quoted_localpart_with_size_no_angles(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL from: "Fred Blogs"@example.com SIZE=1000')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
  
      def test_nested_MAIL(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL from:eggs@example')
          self.write_line(b'MAIL from:spam@example')
          self.assertEqual(self.channel.socket.last,
              b'503 Error: nested MAIL command\r\n')
  
      def test_VRFY(self):
          self.write_line(b'VRFY eggs@example')
          self.assertEqual(self.channel.socket.last,
              b'252 Cannot VRFY user, but will accept message and attempt ' + \
              b'delivery\r\n')
  
      def test_VRFY_syntax(self):
          self.write_line(b'VRFY')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: VRFY <address>\r\n')
  
      def test_EXPN_not_implemented(self):
          self.write_line(b'EXPN')
          self.assertEqual(self.channel.socket.last,
              b'502 EXPN not implemented\r\n')
  
      def test_no_HELO_MAIL(self):
          self.write_line(b'MAIL from:<foo@example.com>')
          self.assertEqual(self.channel.socket.last,
                           b'503 Error: send HELO first\r\n')
  
      def test_need_RCPT(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'DATA')
          self.assertEqual(self.channel.socket.last,
              b'503 Error: need RCPT command\r\n')
  
      def test_RCPT_syntax_HELO(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From: eggs@example')
          self.write_line(b'RCPT to eggs@example')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: RCPT TO: <address>\r\n')
  
      def test_RCPT_syntax_EHLO(self):
          self.write_line(b'EHLO example')
          self.write_line(b'MAIL From: eggs@example')
          self.write_line(b'RCPT to eggs@example')
          self.assertEqual(self.channel.socket.last,
              b'501 Syntax: RCPT TO: <address> [SP <mail-parameters>]\r\n')
  
      def test_RCPT_lowercase_to_OK(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From: eggs@example')
          self.write_line(b'RCPT to: <eggs@example>')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_no_HELO_RCPT(self):
          self.write_line(b'RCPT to eggs@example')
          self.assertEqual(self.channel.socket.last,
                           b'503 Error: send HELO first\r\n')
  
      def test_data_dialog(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.write_line(b'RCPT To:spam@example')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
          self.write_line(b'DATA')
          self.assertEqual(self.channel.socket.last,
              b'354 End data with <CR><LF>.<CR><LF>\r\n')
          self.write_line(b'data\r\nmore\r\n.')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.assertEqual(self.server.messages,
              [(('peer-address', 'peer-port'),
                'eggs@example',
                ['spam@example'],
                'data\nmore')])
  
      def test_DATA_syntax(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA spam')
          self.assertEqual(self.channel.socket.last, b'501 Syntax: DATA\r\n')
  
      def test_no_HELO_DATA(self):
          self.write_line(b'DATA spam')
          self.assertEqual(self.channel.socket.last,
                           b'503 Error: send HELO first\r\n')
  
      def test_data_transparency_section_4_5_2(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'..\r\n.\r\n')
          self.assertEqual(self.channel.received_data, '.')
  
      def test_multiple_RCPT(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'RCPT To:ham@example')
          self.write_line(b'DATA')
          self.write_line(b'data\r\n.')
          self.assertEqual(self.server.messages,
              [(('peer-address', 'peer-port'),
                'eggs@example',
                ['spam@example','ham@example'],
                'data')])
  
      def test_manual_status(self):
          # checks that the Channel is able to return a custom status message
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'return status\r\n.')
          self.assertEqual(self.channel.socket.last, b'250 Okish\r\n')
  
      def test_RSET(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'RSET')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.write_line(b'MAIL From:foo@example')
          self.write_line(b'RCPT To:eggs@example')
          self.write_line(b'DATA')
          self.write_line(b'data\r\n.')
          self.assertEqual(self.server.messages,
              [(('peer-address', 'peer-port'),
                 'foo@example',
                 ['eggs@example'],
                 'data')])
  
      def test_HELO_RSET(self):
          self.write_line(b'HELO example')
          self.write_line(b'RSET')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_RSET_syntax(self):
          self.write_line(b'RSET hi')
          self.assertEqual(self.channel.socket.last, b'501 Syntax: RSET\r\n')
  
      def test_unknown_command(self):
          self.write_line(b'UNKNOWN_CMD')
          self.assertEqual(self.channel.socket.last,
                           b'500 Error: command "UNKNOWN_CMD" not ' + \
                           b'recognized\r\n')
  
      def test_attribute_deprecations(self):
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__server
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__server = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__line
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__line = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__state
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__state = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__greeting
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__greeting = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__mailfrom
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__mailfrom = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__rcpttos
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__rcpttos = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__data
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__data = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__fqdn
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__fqdn = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__peer
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__peer = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__conn
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__conn = 'spam'
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              spam = self.channel._SMTPChannel__addr
          with warnings_helper.check_warnings(('', DeprecationWarning)):
              self.channel._SMTPChannel__addr = 'spam'
  
  @unittest.skipUnless(socket_helper.IPV6_ENABLED, "IPv6 not enabled")
  class SMTPDChannelIPv6Test(SMTPDChannelTest):
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
          self.server = DummyServer((socket_helper.HOSTv6, 0), ('b', 0),
                                    decode_data=True)
          conn, addr = self.server.accept()
          self.channel = smtpd.SMTPChannel(self.server, conn, addr,
                                           decode_data=True)
  
  class SMTPDChannelWithDataSizeLimitTest(unittest.TestCase):
  
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
          self.server = DummyServer((socket_helper.HOST, 0), ('b', 0),
                                    decode_data=True)
          conn, addr = self.server.accept()
          # Set DATA size limit to 32 bytes for easy testing
          self.channel = smtpd.SMTPChannel(self.server, conn, addr, 32,
                                           decode_data=True)
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, line):
          self.channel.socket.queue_recv(line)
          self.channel.handle_read()
  
      def test_data_limit_dialog(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.write_line(b'RCPT To:spam@example')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
          self.write_line(b'DATA')
          self.assertEqual(self.channel.socket.last,
              b'354 End data with <CR><LF>.<CR><LF>\r\n')
          self.write_line(b'data\r\nmore\r\n.')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.assertEqual(self.server.messages,
              [(('peer-address', 'peer-port'),
                'eggs@example',
                ['spam@example'],
                'data\nmore')])
  
      def test_data_limit_dialog_too_much_data(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
          self.write_line(b'RCPT To:spam@example')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
          self.write_line(b'DATA')
          self.assertEqual(self.channel.socket.last,
              b'354 End data with <CR><LF>.<CR><LF>\r\n')
          self.write_line(b'This message is longer than 32 bytes\r\n.')
          self.assertEqual(self.channel.socket.last,
                           b'552 Error: Too much mail data\r\n')
  
  
  class SMTPDChannelWithDecodeDataFalse(unittest.TestCase):
  
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
          self.server = DummyServer((socket_helper.HOST, 0), ('b', 0))
          conn, addr = self.server.accept()
          self.channel = smtpd.SMTPChannel(self.server, conn, addr)
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, line):
          self.channel.socket.queue_recv(line)
          self.channel.handle_read()
  
      def test_ascii_data(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'plain ascii text')
          self.write_line(b'.')
          self.assertEqual(self.channel.received_data, b'plain ascii text')
  
      def test_utf8_data(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'utf8 enriched text: \xc5\xbc\xc5\xba\xc4\x87')
          self.write_line(b'and some plain ascii')
          self.write_line(b'.')
          self.assertEqual(
              self.channel.received_data,
              b'utf8 enriched text: \xc5\xbc\xc5\xba\xc4\x87\n'
                  b'and some plain ascii')
  
  
  class SMTPDChannelWithDecodeDataTrue(unittest.TestCase):
  
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
          self.server = DummyServer((socket_helper.HOST, 0), ('b', 0),
                                    decode_data=True)
          conn, addr = self.server.accept()
          # Set decode_data to True
          self.channel = smtpd.SMTPChannel(self.server, conn, addr,
                  decode_data=True)
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, line):
          self.channel.socket.queue_recv(line)
          self.channel.handle_read()
  
      def test_ascii_data(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'plain ascii text')
          self.write_line(b'.')
          self.assertEqual(self.channel.received_data, 'plain ascii text')
  
      def test_utf8_data(self):
          self.write_line(b'HELO example')
          self.write_line(b'MAIL From:eggs@example')
          self.write_line(b'RCPT To:spam@example')
          self.write_line(b'DATA')
          self.write_line(b'utf8 enriched text: \xc5\xbc\xc5\xba\xc4\x87')
          self.write_line(b'and some plain ascii')
          self.write_line(b'.')
          self.assertEqual(
              self.channel.received_data,
              'utf8 enriched text: żźć\nand some plain ascii')
  
  
  class SMTPDChannelTestWithEnableSMTPUTF8True(unittest.TestCase):
      def setUp(self):
          smtpd.socket = asyncore.socket = mock_socket
          self.old_debugstream = smtpd.DEBUGSTREAM
          self.debug = smtpd.DEBUGSTREAM = io.StringIO()
          self.server = DummyServer((socket_helper.HOST, 0), ('b', 0),
                                    enable_SMTPUTF8=True)
          conn, addr = self.server.accept()
          self.channel = smtpd.SMTPChannel(self.server, conn, addr,
                                           enable_SMTPUTF8=True)
  
      def tearDown(self):
          asyncore.close_all()
          asyncore.socket = smtpd.socket = socket
          smtpd.DEBUGSTREAM = self.old_debugstream
  
      def write_line(self, line):
          self.channel.socket.queue_recv(line)
          self.channel.handle_read()
  
      def test_MAIL_command_accepts_SMTPUTF8_when_announced(self):
          self.write_line(b'EHLO example')
          self.write_line(
              'MAIL from: <naïve@example.com> BODY=8BITMIME SMTPUTF8'.encode(
                  'utf-8')
          )
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_process_smtputf8_message(self):
          self.write_line(b'EHLO example')
          for mail_parameters in [b'', b'BODY=8BITMIME SMTPUTF8']:
              self.write_line(b'MAIL from: <a@example> ' + mail_parameters)
              self.assertEqual(self.channel.socket.last[0:3], b'250')
              self.write_line(b'rcpt to:<b@example.com>')
              self.assertEqual(self.channel.socket.last[0:3], b'250')
              self.write_line(b'data')
              self.assertEqual(self.channel.socket.last[0:3], b'354')
              self.write_line(b'c\r\n.')
              if mail_parameters == b'':
                  self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
              else:
                  self.assertEqual(self.channel.socket.last,
                                   b'250 SMTPUTF8 message okish\r\n')
  
      def test_utf8_data(self):
          self.write_line(b'EHLO example')
          self.write_line(
              'MAIL From: naïve@examplé BODY=8BITMIME SMTPUTF8'.encode('utf-8'))
          self.assertEqual(self.channel.socket.last[0:3], b'250')
          self.write_line('RCPT To:späm@examplé'.encode('utf-8'))
          self.assertEqual(self.channel.socket.last[0:3], b'250')
          self.write_line(b'DATA')
          self.assertEqual(self.channel.socket.last[0:3], b'354')
          self.write_line(b'utf8 enriched text: \xc5\xbc\xc5\xba\xc4\x87')
          self.write_line(b'.')
          self.assertEqual(
              self.channel.received_data,
              b'utf8 enriched text: \xc5\xbc\xc5\xba\xc4\x87')
  
      def test_MAIL_command_limit_extended_with_SIZE_and_SMTPUTF8(self):
          self.write_line(b'ehlo example')
          fill_len = (512 + 26 + 10) - len('mail from:<@example>')
          self.write_line(b'MAIL from:<' +
                          b'a' * (fill_len + 1) +
                          b'@example>')
          self.assertEqual(self.channel.socket.last,
                           b'500 Error: line too long\r\n')
          self.write_line(b'MAIL from:<' +
                          b'a' * fill_len +
                          b'@example>')
          self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
  
      def test_multiple_emails_with_extended_command_length(self):
          self.write_line(b'ehlo example')
          fill_len = (512 + 26 + 10) - len('mail from:<@example>')
          for char in [b'a', b'b', b'c']:
              self.write_line(b'MAIL from:<' + char * fill_len + b'a@example>')
              self.assertEqual(self.channel.socket.last[0:3], b'500')
              self.write_line(b'MAIL from:<' + char * fill_len + b'@example>')
              self.assertEqual(self.channel.socket.last[0:3], b'250')
              self.write_line(b'rcpt to:<hans@example.com>')
              self.assertEqual(self.channel.socket.last[0:3], b'250')
              self.write_line(b'data')
              self.assertEqual(self.channel.socket.last[0:3], b'354')
              self.write_line(b'test\r\n.')
              self.assertEqual(self.channel.socket.last[0:3], b'250')
  
  
  class MiscTestCase(unittest.TestCase):
      def test__all__(self):
          not_exported = {
              "program", "Devnull", "DEBUGSTREAM", "NEWLINE", "COMMASPACE",
              "DATA_SIZE_DEFAULT", "usage", "Options", "parseargs",
          }
          support.check__all__(self, smtpd, not_exported=not_exported)
  
  
  if __name__ == "__main__":
      unittest.main()
  