Issue #1926: Add support for NNTP over SSL on port 563, as well as
STARTTLS. Patch by Andrew Vant.
This commit is contained in:
parent
14fb79977b
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1cb121ecea
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@ -69,6 +69,22 @@ The module itself defines the following classes:
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*readermode* defaults to ``None``. *usenetrc* defaults to ``True``.
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.. class:: NNTP_SSL(host, port=563, user=None, password=None, ssl_context=None, readermode=None, usenetrc=True, [timeout])
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Return a new :class:`NNTP_SSL` object, representing an encrypted
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connection to the NNTP server running on host *host*, listening at
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port *port*. :class:`NNTP_SSL` objects have the same methods as
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:class:`NNTP` objects. If *port* is omitted, port 563 (NNTPS) is used.
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*ssl_context* is also optional, and is a :class:`~ssl.SSLContext` object.
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All other parameters behave the same as for :class:`NNTP`.
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Note that SSL-on-563 is discouraged per :rfc:`4642`, in favor of
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STARTTLS as described below. However, some servers only support the
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former.
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.. versionadded:: 3.2
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.. exception:: NNTPError
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Derived from the standard exception :exc:`Exception`, this is the base
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@ -111,8 +127,8 @@ The module itself defines the following classes:
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NNTP Objects
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------------
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When connected, :class:`NNTP` objects support the following methods and
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attributes.
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When connected, :class:`NNTP` and :class:`NNTP_SSL` objects support the
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following methods and attributes.
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Attributes
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^^^^^^^^^^
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@ -179,6 +195,35 @@ tuples or objects that the method normally returns will be empty.
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.. versionadded:: 3.2
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.. method:: NNTP.login(user=None, password=None, usenetrc=True)
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Send ``AUTHINFO`` commands with the user name and password. If *user*
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and *password* are None and *usenetrc* is True, credentials from
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``~/.netrc`` will be used if possible.
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Unless intentionally delayed, login is normally performed during the
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:class:`NNTP` object initialization and separately calling this function
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is unnecessary. To force authentication to be delayed, you must not set
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*user* or *password* when creating the object, and must set *usenetrc* to
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False.
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.. versionadded:: 3.2
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.. method:: NNTP.starttls(ssl_context=None)
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Send a ``STARTTLS`` command. The *ssl_context* argument is optional
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and should be a :class:`ssl.SSLContext` object. This will enable
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encryption on the NNTP connection.
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Note that this may not be done after authentication information has
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been transmitted, and authentication occurs by default if possible during a
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:class:`NNTP` object initialization. See :meth:`NNTP.login` for information
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on suppressing this behavior.
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.. versionadded:: 3.2
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.. method:: NNTP.newgroups(date, *, file=None)
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Send a ``NEWGROUPS`` command. The *date* argument should be a
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255
Lib/nntplib.py
255
Lib/nntplib.py
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@ -69,6 +69,13 @@ import collections
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import datetime
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import warnings
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try:
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import ssl
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except ImportError:
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_have_ssl = False
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else:
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_have_ssl = True
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from email.header import decode_header as _email_decode_header
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from socket import _GLOBAL_DEFAULT_TIMEOUT
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@ -111,7 +118,7 @@ class NNTPDataError(NNTPError):
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# Standard port used by NNTP servers
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NNTP_PORT = 119
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NNTP_SSL_PORT = 563
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# Response numbers that are followed by additional text (e.g. article)
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_LONGRESP = {
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@ -263,6 +270,23 @@ def _unparse_datetime(dt, legacy=False):
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return date_str, time_str
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if _have_ssl:
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def _encrypt_on(sock, context):
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"""Wrap a socket in SSL/TLS. Arguments:
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- sock: Socket to wrap
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- context: SSL context to use for the encrypted connection
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Returns:
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- sock: New, encrypted socket.
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"""
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# Generate a default SSL context if none was passed.
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if context is None:
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context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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# SSLv2 considered harmful.
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context.options |= ssl.OP_NO_SSLv2
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return context.wrap_socket(sock)
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# The classes themselves
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class _NNTPBase:
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# UTF-8 is the character set for all NNTP commands and responses: they
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@ -280,18 +304,13 @@ class _NNTPBase:
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encoding = 'utf-8'
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errors = 'surrogateescape'
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def __init__(self, file, host, user=None, password=None,
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readermode=None, usenetrc=True,
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timeout=_GLOBAL_DEFAULT_TIMEOUT):
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def __init__(self, file, host,
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readermode=None, timeout=_GLOBAL_DEFAULT_TIMEOUT):
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"""Initialize an instance. Arguments:
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- file: file-like object (open for read/write in binary mode)
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- host: hostname of the server (used if `usenetrc` is True)
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- user: username to authenticate with
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- password: password to use with username
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- readermode: if true, send 'mode reader' command after
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connecting.
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- usenetrc: allow loading username and password from ~/.netrc file
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if not specified explicitly
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- timeout: timeout (in seconds) used for socket connections
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readermode is sometimes necessary if you are connecting to an
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@ -300,59 +319,47 @@ class _NNTPBase:
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unexpected NNTPPermanentErrors, you might need to set
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readermode.
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"""
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self.host = host
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self.file = file
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self.debugging = 0
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self.welcome = self._getresp()
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# 'mode reader' is sometimes necessary to enable 'reader' mode.
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# However, the order in which 'mode reader' and 'authinfo' need to
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# arrive differs between some NNTP servers. Try to send
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# 'mode reader', and if it fails with an authorization failed
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# error, try again after sending authinfo.
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readermode_afterauth = 0
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# 'MODE READER' is sometimes necessary to enable 'reader' mode.
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# However, the order in which 'MODE READER' and 'AUTHINFO' need to
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# arrive differs between some NNTP servers. If _setreadermode() fails
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# with an authorization failed error, it will set this to True;
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# the login() routine will interpret that as a request to try again
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# after performing its normal function.
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self.readermode_afterauth = False
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if readermode:
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try:
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self.welcome = self._shortcmd('mode reader')
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except NNTPPermanentError:
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# error 500, probably 'not implemented'
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pass
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except NNTPTemporaryError as e:
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if user and e.response.startswith('480'):
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# Need authorization before 'mode reader'
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readermode_afterauth = 1
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else:
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raise
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# If no login/password was specified, try to get them from ~/.netrc
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# Presume that if .netc has an entry, NNRP authentication is required.
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try:
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if usenetrc and not user:
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import netrc
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credentials = netrc.netrc()
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auth = credentials.authenticators(host)
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if auth:
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user = auth[0]
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password = auth[2]
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except IOError:
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pass
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# Perform NNTP authentication if needed.
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if user:
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resp = self._shortcmd('authinfo user '+user)
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if resp.startswith('381'):
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if not password:
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raise NNTPReplyError(resp)
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else:
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resp = self._shortcmd(
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'authinfo pass '+password)
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if not resp.startswith('281'):
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raise NNTPPermanentError(resp)
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if readermode_afterauth:
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try:
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self.welcome = self._shortcmd('mode reader')
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except NNTPPermanentError:
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# error 500, probably 'not implemented'
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pass
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self._setreadermode()
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# Inquire about capabilities (RFC 3977)
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# RFC 4642 2.2.2: Both the client and the server MUST know if there is
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# a TLS session active. A client MUST NOT attempt to start a TLS
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# session if a TLS session is already active.
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self.tls_on = False
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# Inquire about capabilities (RFC 3977).
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self._caps = None
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self.getcapabilities()
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# Log in and encryption setup order is left to subclasses.
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self.authenticated = False
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def getwelcome(self):
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"""Get the welcome message from the server
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(this is read and squirreled away by __init__()).
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If the response code is 200, posting is allowed;
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if it 201, posting is not allowed."""
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if self.debugging: print('*welcome*', repr(self.welcome))
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return self.welcome
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def getcapabilities(self):
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"""Get the server capabilities, as read by __init__().
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If the CAPABILITIES command is not supported, an empty dict is
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returned."""
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if self._caps is None:
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self.nntp_version = 1
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self.nntp_implementation = None
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try:
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@ -368,20 +375,6 @@ class _NNTPBase:
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self.nntp_version = max(map(int, caps['VERSION']))
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if 'IMPLEMENTATION' in caps:
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self.nntp_implementation = ' '.join(caps['IMPLEMENTATION'])
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def getwelcome(self):
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"""Get the welcome message from the server
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(this is read and squirreled away by __init__()).
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If the response code is 200, posting is allowed;
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if it 201, posting is not allowed."""
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if self.debugging: print('*welcome*', repr(self.welcome))
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return self.welcome
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def getcapabilities(self):
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"""Get the server capabilities, as read by __init__().
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If the CAPABILITIES command is not supported, an empty dict is
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returned."""
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return self._caps
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def set_debuglevel(self, level):
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@ -918,6 +911,77 @@ class _NNTPBase:
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self._close()
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return resp
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def login(self, user=None, password=None, usenetrc=True):
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if self.authenticated:
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raise ValueError("Already logged in.")
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if not user and not usenetrc:
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raise ValueError(
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"At least one of `user` and `usenetrc` must be specified")
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# If no login/password was specified but netrc was requested,
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# try to get them from ~/.netrc
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# Presume that if .netrc has an entry, NNRP authentication is required.
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try:
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if usenetrc and not user:
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import netrc
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credentials = netrc.netrc()
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auth = credentials.authenticators(self.host)
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if auth:
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user = auth[0]
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password = auth[2]
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except IOError:
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pass
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# Perform NNTP authentication if needed.
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if not user:
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return
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resp = self._shortcmd('authinfo user ' + user)
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if resp.startswith('381'):
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if not password:
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raise NNTPReplyError(resp)
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else:
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resp = self._shortcmd('authinfo pass ' + password)
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if not resp.startswith('281'):
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raise NNTPPermanentError(resp)
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# Attempt to send mode reader if it was requested after login.
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if self.readermode_afterauth:
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self._setreadermode()
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def _setreadermode(self):
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try:
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self.welcome = self._shortcmd('mode reader')
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except NNTPPermanentError:
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# Error 5xx, probably 'not implemented'
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pass
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except NNTPTemporaryError as e:
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if e.response.startswith('480'):
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# Need authorization before 'mode reader'
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self.readermode_afterauth = True
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else:
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raise
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if _have_ssl:
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def starttls(self, context=None):
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"""Process a STARTTLS command. Arguments:
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- context: SSL context to use for the encrypted connection
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"""
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# Per RFC 4642, STARTTLS MUST NOT be sent after authentication or if
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# a TLS session already exists.
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if self.tls_on:
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raise ValueError("TLS is already enabled.")
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if self.authenticated:
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raise ValueError("TLS cannot be started after authentication.")
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resp = self._shortcmd('STARTTLS')
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if resp.startswith('382'):
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self.file.close()
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self.sock = _encrypt_on(self.sock, context)
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self.file = self.sock.makefile("rwb")
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self.tls_on = True
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# Capabilities may change after TLS starts up, so ask for them
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# again.
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self._caps = None
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self.getcapabilities()
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else:
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raise NNTPError("TLS failed to start.")
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class NNTP(_NNTPBase):
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@ -945,8 +1009,10 @@ class NNTP(_NNTPBase):
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self.port = port
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self.sock = socket.create_connection((host, port), timeout)
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file = self.sock.makefile("rwb")
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_NNTPBase.__init__(self, file, host, user, password,
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readermode, usenetrc, timeout)
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_NNTPBase.__init__(self, file, host,
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readermode, timeout)
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if user or usenetrc:
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self.login(user, password, usenetrc)
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def _close(self):
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try:
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@ -955,6 +1021,33 @@ class NNTP(_NNTPBase):
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self.sock.close()
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if _have_ssl:
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class NNTP_SSL(_NNTPBase):
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def __init__(self, host, port=NNTP_SSL_PORT,
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user=None, password=None, ssl_context=None,
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readermode=None, usenetrc=True,
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timeout=_GLOBAL_DEFAULT_TIMEOUT):
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"""This works identically to NNTP.__init__, except for the change
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in default port and the `ssl_context` argument for SSL connections.
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"""
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self.sock = socket.create_connection((host, port), timeout)
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self.sock = _encrypt_on(self.sock, ssl_context)
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file = self.sock.makefile("rwb")
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_NNTPBase.__init__(self, file, host,
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readermode=readermode, timeout=timeout)
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if user or usenetrc:
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self.login(user, password, usenetrc)
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def _close(self):
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try:
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_NNTPBase._close(self)
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finally:
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self.sock.close()
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__all__.append("NNTP_SSL")
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# Test retrieval when run as a script.
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if __name__ == '__main__':
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import argparse
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@ -966,13 +1059,27 @@ if __name__ == '__main__':
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help='group to fetch messages from (default: %(default)s)')
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parser.add_argument('-s', '--server', default='news.gmane.org',
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help='NNTP server hostname (default: %(default)s)')
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parser.add_argument('-p', '--port', default=NNTP_PORT, type=int,
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help='NNTP port number (default: %(default)s)')
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parser.add_argument('-p', '--port', default=-1, type=int,
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help='NNTP port number (default: %s / %s)' % (NNTP_PORT, NNTP_SSL_PORT))
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parser.add_argument('-n', '--nb-articles', default=10, type=int,
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help='number of articles to fetch (default: %(default)s)')
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parser.add_argument('-S', '--ssl', action='store_true', default=False,
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help='use NNTP over SSL')
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args = parser.parse_args()
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s = NNTP(host=args.server, port=args.port)
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port = args.port
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if not args.ssl:
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if port == -1:
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port = NNTP_PORT
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s = NNTP(host=args.server, port=port)
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else:
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if port == -1:
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port = NNTP_SSL_PORT
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s = NNTP_SSL(host=args.server, port=port)
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caps = s.getcapabilities()
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if 'STARTTLS' in caps:
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s.starttls()
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resp, count, first, last, name = s.group(args.group)
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print('Group', name, 'has', count, 'articles, range', first, 'to', last)
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@ -4,8 +4,10 @@ import textwrap
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import unittest
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import contextlib
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from test import support
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from nntplib import NNTP, GroupInfo
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from nntplib import NNTP, GroupInfo, _have_ssl
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import nntplib
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if _have_ssl:
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import ssl
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TIMEOUT = 30
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@ -106,7 +108,7 @@ class NetworkedNNTPTestsMixin:
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"references", ":bytes", ":lines"}
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)
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for v in art_dict.values():
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self.assertIsInstance(v, str)
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self.assertIsInstance(v, (str, type(None)))
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def test_xover(self):
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resp, count, first, last, name = self.server.group(self.GROUP_NAME)
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@ -162,26 +164,19 @@ class NetworkedNNTPTestsMixin:
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self.server.quit()
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self.server = None
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class NetworkedNNTPTests(NetworkedNNTPTestsMixin, unittest.TestCase):
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NNTP_HOST = 'news.gmane.org'
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GROUP_NAME = 'gmane.comp.python.devel'
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GROUP_PAT = 'gmane.comp.python.d*'
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def setUp(self):
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support.requires("network")
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with support.transient_internet(self.NNTP_HOST):
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self.server = NNTP(self.NNTP_HOST, timeout=TIMEOUT, usenetrc=False)
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def tearDown(self):
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if self.server is not None:
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self.server.quit()
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# Disabled with gmane as it produces too much data
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test_list = None
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def test_login(self):
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baduser = "notarealuser"
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badpw = "notarealpassword"
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# Check that bogus credentials cause failure
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self.assertRaises(nntplib.NNTPError, self.server.login,
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user=baduser, password=badpw, usenetrc=False)
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# FIXME: We should check that correct credentials succeed, but that
|
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# would require valid details for some server somewhere to be in the
|
||||
# test suite, I think. Gmane is anonymous, at least as used for the
|
||||
# other tests.
|
||||
|
||||
def test_capabilities(self):
|
||||
# As of this writing, gmane implements NNTP version 2 and has a
|
||||
# The server under test implements NNTP version 2 and has a
|
||||
# couple of well-known capabilities. Just sanity check that we
|
||||
# got them.
|
||||
def _check_caps(caps):
|
||||
|
@ -194,6 +189,63 @@ class NetworkedNNTPTests(NetworkedNNTPTestsMixin, unittest.TestCase):
|
|||
resp, caps = self.server.capabilities()
|
||||
_check_caps(caps)
|
||||
|
||||
if _have_ssl:
|
||||
def test_starttls(self):
|
||||
file = self.server.file
|
||||
sock = self.server.sock
|
||||
try:
|
||||
self.server.starttls()
|
||||
except nntplib.NNTPPermanentError:
|
||||
self.skipTest("STARTTLS not supported by server.")
|
||||
else:
|
||||
# Check that the socket and internal pseudo-file really were
|
||||
# changed.
|
||||
self.assertNotEqual(file, self.server.file)
|
||||
self.assertNotEqual(sock, self.server.sock)
|
||||
# Check that the new socket really is an SSL one
|
||||
self.assertIsInstance(self.server.sock, ssl.SSLSocket)
|
||||
# Check that trying starttls when it's already active fails.
|
||||
self.assertRaises(ValueError, self.server.starttls)
|
||||
|
||||
|
||||
class NetworkedNNTPTests(NetworkedNNTPTestsMixin, unittest.TestCase):
|
||||
# This server supports STARTTLS (gmane doesn't)
|
||||
NNTP_HOST = 'news.trigofacile.com'
|
||||
GROUP_NAME = 'fr.comp.lang.python'
|
||||
GROUP_PAT = 'fr.comp.lang.*'
|
||||
|
||||
def setUp(self):
|
||||
support.requires("network")
|
||||
with support.transient_internet(self.NNTP_HOST):
|
||||
self.server = NNTP(self.NNTP_HOST, timeout=TIMEOUT, usenetrc=False)
|
||||
|
||||
def tearDown(self):
|
||||
if self.server is not None:
|
||||
self.server.quit()
|
||||
|
||||
|
||||
if _have_ssl:
|
||||
class NetworkedNNTP_SSLTests(NetworkedNNTPTestsMixin, unittest.TestCase):
|
||||
NNTP_HOST = 'snews.gmane.org'
|
||||
GROUP_NAME = 'gmane.comp.python.devel'
|
||||
GROUP_PAT = 'gmane.comp.python.d*'
|
||||
|
||||
def setUp(self):
|
||||
support.requires("network")
|
||||
with support.transient_internet(self.NNTP_HOST):
|
||||
self.server = nntplib.NNTP_SSL(self.NNTP_HOST, timeout=TIMEOUT,
|
||||
usenetrc=False)
|
||||
|
||||
def tearDown(self):
|
||||
if self.server is not None:
|
||||
self.server.quit()
|
||||
|
||||
# Disabled with gmane as it produces too much data
|
||||
test_list = None
|
||||
|
||||
# Disabled as the connection will already be encrypted.
|
||||
test_starttls = None
|
||||
|
||||
|
||||
#
|
||||
# Non-networked tests using a local server (or something mocking it).
|
||||
|
@ -261,7 +313,6 @@ class MockedNNTPTestsMixin:
|
|||
# Using BufferedRWPair instead of BufferedRandom ensures the file
|
||||
# isn't seekable.
|
||||
file = io.BufferedRWPair(self.sio, self.sio)
|
||||
kwargs.setdefault('usenetrc', False)
|
||||
self.server = nntplib._NNTPBase(file, 'test.server', *args, **kwargs)
|
||||
return self.server
|
||||
|
||||
|
@ -1134,9 +1185,10 @@ class MiscTests(unittest.TestCase):
|
|||
|
||||
|
||||
def test_main():
|
||||
support.run_unittest(MiscTests, NNTPv1Tests, NNTPv2Tests,
|
||||
NetworkedNNTPTests
|
||||
)
|
||||
tests = [MiscTests, NNTPv1Tests, NNTPv2Tests, NetworkedNNTPTests]
|
||||
if _have_ssl:
|
||||
tests.append(NetworkedNNTP_SSLTests)
|
||||
support.run_unittest(*tests)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
|
|
|
@ -843,6 +843,7 @@ Hector Urtubia
|
|||
Andi Vajda
|
||||
Case Van Horsen
|
||||
Kyle VanderBeek
|
||||
Andrew Vant
|
||||
Atul Varma
|
||||
Dmitry Vasiliev
|
||||
Alexandre Vassalotti
|
||||
|
|
Loading…
Reference in New Issue