diff options
Diffstat (limited to 'Doc/library/smtpd.rst')
| -rw-r--r-- | Doc/library/smtpd.rst | 88 |
1 files changed, 77 insertions, 11 deletions
diff --git a/Doc/library/smtpd.rst b/Doc/library/smtpd.rst index 3ebed06..977f9a8 100644 --- a/Doc/library/smtpd.rst +++ b/Doc/library/smtpd.rst @@ -20,7 +20,8 @@ specific mail-sending strategies. Additionally the SMTPChannel may be extended to implement very specific interaction behaviour with SMTP clients. -The code supports :RFC:`5321`, plus the :rfc:`1870` SIZE extension. +The code supports :RFC:`5321`, plus the :rfc:`1870` SIZE and :rfc:`6531` +SMTPUTF8 extensions. SMTPServer Objects @@ -28,7 +29,7 @@ SMTPServer Objects .. class:: SMTPServer(localaddr, remoteaddr, data_size_limit=33554432,\ - map=None) + map=None, enable_SMTPUTF8=False, decode_data=True) Create a new :class:`SMTPServer` object, which binds to local address *localaddr*. It will treat *remoteaddr* as an upstream SMTP relayer. It @@ -39,25 +40,77 @@ SMTPServer Objects accepted in a ``DATA`` command. A value of ``None`` or ``0`` means no limit. - A dictionary can be specified in *map* to avoid using a global socket map. - - .. method:: process_message(peer, mailfrom, rcpttos, data) - - Raise :exc:`NotImplementedError` exception. Override this in subclasses to + *map* is the socket map to use for connections (an initially empty + dictionary is a suitable value). If not specified the :mod:`asyncore` + global socket map is used. + + *enable_SMTPUTF8* determins whether the ``SMTPUTF8`` extension (as defined + in :RFC:`6531`) should be enabled. The default is ``False``. If set to + ``True``, *decode_data* must be ``False`` (otherwise an error is raised). + When ``True``, ``SMTPUTF8`` is accepted as a parameter to the ``MAIL`` + command and when present is passed to :meth:`process_message` in the + ``kwargs['mail_options']`` list. + + *decode_data* specifies whether the data portion of the SMTP transaction + should be decoded using UTF-8. The default is ``True`` for backward + compatibility reasons, but will change to ``False`` in Python 3.6; specify + the keyword value explicitly to avoid the :exc:`DeprecationWarning`. When + *decode_data* is set to ``False`` the server advertises the ``8BITMIME`` + extension (:rfc:`6152`), accepts the ``BODY=8BITMIME`` parameter to + the ``MAIL`` command, and when present passes it to :meth:`process_message` + in the ``kwargs['mail_options']`` list. + + .. method:: process_message(peer, mailfrom, rcpttos, data, **kwargs) + + Raise a :exc:`NotImplementedError` exception. Override this in subclasses to do something useful with this message. Whatever was passed in the constructor as *remoteaddr* will be available as the :attr:`_remoteaddr` attribute. *peer* is the remote host's address, *mailfrom* is the envelope originator, *rcpttos* are the envelope recipients and *data* is a string - containing the contents of the e-mail (which should be in :rfc:`2822` + containing the contents of the e-mail (which should be in :rfc:`5321` format). + If the *decode_data* constructor keyword is set to ``True``, the *data* + argument will be a unicode string. If it is set to ``False``, it + will be a bytes object. + + *kwargs* is a dictionary containing additional information. It is empty + unless at least one of ``decode_data=False`` or ``enable_SMTPUTF8=True`` + was given as an init parameter, in which case it contains the following + keys: + + *mail_options*: + a list of all received parameters to the ``MAIL`` + command (the elements are uppercase strings; example: + ``['BODY=8BITMIME', 'SMTPUTF8']``). + + *rcpt_options*: + same as *mail_options* but for the ``RCPT`` command. + Currently no ``RCPT TO`` options are supported, so for now + this will always be an empty list. + + Implementations of ``process_message`` should use the ``**kwargs`` + signature to accept arbitrary keyword arguments, since future feature + enhancements may add keys to the kwargs dictionary. + + Return ``None`` to request a normal ``250 Ok`` response; otherwise + return the desired response string in :RFC:`5321` format. + .. attribute:: channel_class Override this in subclasses to use a custom :class:`SMTPChannel` for managing SMTP clients. - .. versionchanged:: 3.4 - The *map* argument was added. + .. versionadded:: 3.4 + The *map* constructor argument. + + .. versionchanged:: 3.5 + *localaddr* and *remoteaddr* may now contain IPv6 addresses. + + .. versionadded:: 3.5 + the *decode_data* and *enable_SMTPUTF8* constructor arguments, and the + *kwargs* argument to :meth:`process_message` when one or more of these is + specified. DebuggingServer Objects @@ -97,7 +150,7 @@ SMTPChannel Objects ------------------- .. class:: SMTPChannel(server, conn, addr, data_size_limit=33554432,\ - map=None)) + map=None, enable_SMTPUTF8=False, decode_data=True) Create a new :class:`SMTPChannel` object which manages the communication between the server and a single SMTP client. @@ -108,11 +161,24 @@ SMTPChannel Objects accepted in a ``DATA`` command. A value of ``None`` or ``0`` means no limit. + *enable_SMTPUTF8* determins whether the ``SMTPUTF8`` extension (as defined + in :RFC:`6531`) should be enabled. The default is ``False``. A + :exc:`ValueError` is raised if both *enable_SMTPUTF8* and *decode_data* are + set to ``True`` at the same time. + A dictionary can be specified in *map* to avoid using a global socket map. + *decode_data* specifies whether the data portion of the SMTP transaction + should be decoded using UTF-8. The default is ``True`` for backward + compatibility reasons, but will change to ``False`` in Python 3.6. Specify + the keyword value explicitly to avoid the :exc:`DeprecationWarning`. + To use a custom SMTPChannel implementation you need to override the :attr:`SMTPServer.channel_class` of your :class:`SMTPServer`. + .. versionchanged:: 3.5 + the *decode_data* and *enable_SMTPUTF8* arguments were added. + The :class:`SMTPChannel` has the following instance variables: .. attribute:: smtp_server |