import io import socket import datetime import textwrap import unittest import functools import contextlib import nntplib import os.path import re import threading from test import support from test.support import socket_helper from nntplib import NNTP, GroupInfo from unittest.mock import patch try: import ssl except ImportError: ssl = None certfile = os.path.join(os.path.dirname(__file__), 'keycert3.pem') if ssl is not None: SSLError = ssl.SSLError else: class SSLError(Exception): """Non-existent exception class when we lack SSL support.""" reason = "This will never be raised." # TODO: # - test the `file` arg to more commands # - test error conditions # - test auth and `usenetrc` class NetworkedNNTPTestsMixin: def test_welcome(self): welcome = self.server.getwelcome() self.assertEqual(str, type(welcome)) def test_help(self): resp, lines = self.server.help() self.assertTrue(resp.startswith("100 "), resp) for line in lines: self.assertEqual(str, type(line)) def test_list(self): resp, groups = self.server.list() if len(groups) > 0: self.assertEqual(GroupInfo, type(groups[0])) self.assertEqual(str, type(groups[0].group)) def test_list_active(self): resp, groups = self.server.list(self.GROUP_PAT) if len(groups) > 0: self.assertEqual(GroupInfo, type(groups[0])) self.assertEqual(str, type(groups[0].group)) def test_unknown_command(self): with self.assertRaises(nntplib.NNTPPermanentError) as cm: self.server._shortcmd("XYZZY") resp = cm.exception.response self.assertTrue(resp.startswith("500 "), resp) def test_newgroups(self): # gmane gets a constant influx of new groups. In order not to stress # the server too much, we choose a recent date in the past. dt = datetime.date.today() - datetime.timedelta(days=7) resp, groups = self.server.newgroups(dt) if len(groups) > 0: self.assertIsInstance(groups[0], GroupInfo) self.assertIsInstance(groups[0].group, str) def test_description(self): def _check_desc(desc): # Sanity checks self.assertIsInstance(desc, str) self.assertNotIn(self.GROUP_NAME, desc) desc = self.server.description(self.GROUP_NAME) _check_desc(desc) # Another sanity check self.assertIn("Python", desc) # With a pattern desc = self.server.description(self.GROUP_PAT) _check_desc(desc) # Shouldn't exist desc = self.server.description("zk.brrtt.baz") self.assertEqual(desc, '') def test_descriptions(self): resp, descs = self.server.descriptions(self.GROUP_PAT) # 215 for LIST NEWSGROUPS, 282 for XGTITLE self.assertTrue( resp.startswith("215 ") or resp.startswith("282 "), resp) self.assertIsInstance(descs, dict) desc = descs[self.GROUP_NAME] self.assertEqual(desc, self.server.description(self.GROUP_NAME)) def test_group(self): result = self.server.group(self.GROUP_NAME) self.assertEqual(5, len(result)) resp, count, first, last, group = result self.assertEqual(group, self.GROUP_NAME) self.assertIsInstance(count, int) self.assertIsInstance(first, int) self.assertIsInstance(last, int) self.assertLessEqual(first, last) self.assertTrue(resp.startswith("211 "), resp) def test_date(self): resp, date = self.server.date() self.assertIsInstance(date, datetime.datetime) # Sanity check self.assertGreaterEqual(date.year, 1995) self.assertLessEqual(date.year, 2030) def _check_art_dict(self, art_dict): # Some sanity checks for a field dictionary returned by OVER / XOVER self.assertIsInstance(art_dict, dict) # NNTP has 7 mandatory fields self.assertGreaterEqual(art_dict.keys(), {"subject", "from", "date", "message-id", "references", ":bytes", ":lines"} ) for v in art_dict.values(): self.assertIsInstance(v, (str, type(None))) def test_xover(self): resp, count, first, last, name = self.server.group(self.GROUP_NAME) resp, lines = self.server.xover(last - 5, last) if len(lines) == 0: self.skipTest("no articles retrieved") # The 'last' article is not necessarily part of the output (cancelled?) art_num, art_dict = lines[0] self.assertGreaterEqual(art_num, last - 5) self.assertLessEqual(art_num, last) self._check_art_dict(art_dict) @unittest.skipIf(True, 'temporarily skipped until a permanent solution' ' is found for issue #28971') def test_over(self): resp, count, first, last, name = self.server.group(self.GROUP_NAME) start = last - 10 # The "start-" article range form resp, lines = self.server.over((start, None)) art_num, art_dict = lines[0] self._check_art_dict(art_dict) # The "start-end" article range form resp, lines = self.server.over((start, last)) art_num, art_dict = lines[-1] # The 'last' article is not necessarily part of the output (cancelled?) self.assertGreaterEqual(art_num, start) self.assertLessEqual(art_num, last) self._check_art_dict(art_dict) # XXX The "message_id" form is unsupported by gmane # 503 Overview by message-ID unsupported def test_xhdr(self): resp, count, first, last, name = self.server.group(self.GROUP_NAME) resp, lines = self.server.xhdr('subject', last) for line in lines: self.assertEqual(str, type(line[1])) def check_article_resp(self, resp, article, art_num=None): self.assertIsInstance(article, nntplib.ArticleInfo) if art_num is not None: self.assertEqual(article.number, art_num) for line in article.lines: self.assertIsInstance(line, bytes) # XXX this could exceptionally happen... self.assertNotIn(article.lines[-1], (b".", b".\n", b".\r\n")) @unittest.skipIf(True, "FIXME: see bpo-32128") def test_article_head_body(self): resp, count, first, last, name = self.server.group(self.GROUP_NAME) # Try to find an available article for art_num in (last, first, last - 1): try: resp, head = self.server.head(art_num) except nntplib.NNTPTemporaryError as e: if not e.response.startswith("423 "): raise # "423 No such article" => choose another one continue break else: self.skipTest("could not find a suitable article number") self.assertTrue(resp.startswith("221 "), resp) self.check_article_resp(resp, head, art_num) resp, body = self.server.body(art_num) self.assertTrue(resp.startswith("222 "), resp) self.check_article_resp(resp, body, art_num) resp, article = self.server.article(art_num) self.assertTrue(resp.startswith("220 "), resp) self.check_article_resp(resp, article, art_num) # Tolerate running the tests from behind a NNTP virus checker denylist = lambda line: line.startswith(b'X-Antivirus') filtered_head_lines = [line for line in head.lines if not denylist(line)] filtered_lines = [line for line in article.lines if not denylist(line)] self.assertEqual(filtered_lines, filtered_head_lines + [b''] + body.lines) def test_capabilities(self): # 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): caps_list = caps['LIST'] self.assertIsInstance(caps_list, (list, tuple)) self.assertIn('OVERVIEW.FMT', caps_list) self.assertGreaterEqual(self.server.nntp_version, 2) _check_caps(self.server.getcapabilities()) # This re-emits the command resp, caps = self.server.capabilities() _check_caps(caps) def test_zlogin(self): # This test must be the penultimate because further commands will be # refused. baduser = "notarealuser" badpw = "notarealpassword" # Check that bogus credentials cause failure self.assertRaises(nntplib.NNTPError, self.server.login, user=baduser, password=badpw, usenetrc=False) # FIXME: We should check that correct credentials succeed, but that # 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_zzquit(self): # This test must be called last, hence the name cls = type(self) try: self.server.quit() finally: cls.server = None @classmethod def wrap_methods(cls): # Wrap all methods in a transient_internet() exception catcher # XXX put a generic version in test.support? def wrap_meth(meth): @functools.wraps(meth) def wrapped(self): with socket_helper.transient_internet(self.NNTP_HOST): meth(self) return wrapped for name in dir(cls): if not name.startswith('test_'): continue meth = getattr(cls, name) if not callable(meth): continue # Need to use a closure so that meth remains bound to its current # value setattr(cls, name, wrap_meth(meth)) def test_timeout(self): with self.assertRaises(ValueError): self.NNTP_CLASS(self.NNTP_HOST, timeout=0, usenetrc=False) def test_with_statement(self): def is_connected(): if not hasattr(server, 'file'): return False try: server.help() except (OSError, EOFError): return False return True try: server = self.NNTP_CLASS(self.NNTP_HOST, timeout=support.INTERNET_TIMEOUT, usenetrc=False) with server: self.assertTrue(is_connected()) self.assertTrue(server.help()) self.assertFalse(is_connected()) server = self.NNTP_CLASS(self.NNTP_HOST, timeout=support.INTERNET_TIMEOUT, usenetrc=False) with server: server.quit() self.assertFalse(is_connected()) except SSLError as ssl_err: # matches "[SSL: DH_KEY_TOO_SMALL] dh key too small" if re.search(r'(?i)KEY.TOO.SMALL', ssl_err.reason): raise unittest.SkipTest(f"Got {ssl_err} connecting " f"to {self.NNTP_HOST!r}") raise NetworkedNNTPTestsMixin.wrap_methods() EOF_ERRORS = (EOFError,) if ssl is not None: EOF_ERRORS += (ssl.SSLEOFError,) 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.*' NNTP_CLASS = NNTP @classmethod def setUpClass(cls): support.requires("network") with socket_helper.transient_internet(cls.NNTP_HOST): try: cls.server = cls.NNTP_CLASS(cls.NNTP_HOST, timeout=support.INTERNET_TIMEOUT, usenetrc=False) except SSLError as ssl_err: # matches "[SSL: DH_KEY_TOO_SMALL] dh key too small" if re.search(r'(?i)KEY.TOO.SMALL', ssl_err.reason): raise unittest.SkipTest(f"{cls} got {ssl_err} connecting " f"to {cls.NNTP_HOST!r}") raise except EOF_ERRORS: raise unittest.SkipTest(f"{cls} got EOF error on connecting " f"to {cls.NNTP_HOST!r}") @classmethod def tearDownClass(cls): if cls.server is not None: cls.server.quit() @unittest.skipUnless(ssl, 'requires SSL support') class NetworkedNNTP_SSLTests(NetworkedNNTPTests): # Technical limits for this public NNTP server (see http://www.aioe.org): # "Only two concurrent connections per IP address are allowed and # 400 connections per day are accepted from each IP address." NNTP_HOST = 'nntp.aioe.org' GROUP_NAME = 'comp.lang.python' GROUP_PAT = 'comp.lang.*' NNTP_CLASS = getattr(nntplib, 'NNTP_SSL', None) # Disabled 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). # class _NNTPServerIO(io.RawIOBase): """A raw IO object allowing NNTP commands to be received and processed by a handler. The handler can push responses which can then be read from the IO object.""" def __init__(self, handler): io.RawIOBase.__init__(self) # The channel from the client self.c2s = io.BytesIO() # The channel to the client self.s2c = io.BytesIO() self.handler = handler self.handler.start(self.c2s.readline, self.push_data) def readable(self): return True def writable(self): return True def push_data(self, data): """Push (buffer) some data to send to the client.""" pos = self.s2c.tell() self.s2c.seek(0, 2) self.s2c.write(data) self.s2c.seek(pos) def write(self, b): """The client sends us some data""" pos = self.c2s.tell() self.c2s.write(b) self.c2s.seek(pos) self.handler.process_pending() return len(b) def readinto(self, buf): """The client wants to read a response""" self.handler.process_pending() b = self.s2c.read(len(buf)) n = len(b) buf[:n] = b return n def make_mock_file(handler): sio = _NNTPServerIO(handler) # Using BufferedRWPair instead of BufferedRandom ensures the file # isn't seekable. file = io.BufferedRWPair(sio, sio) return (sio, file) class NNTPServer(nntplib.NNTP): def __init__(self, f, host, readermode=None): self.file = f self.host = host self._base_init(readermode) def _close(self): self.file.close() del self.file class MockedNNTPTestsMixin: # Override in derived classes handler_class = None def setUp(self): super().setUp() self.make_server() def tearDown(self): super().tearDown() del self.server def make_server(self, *args, **kwargs): self.handler = self.handler_class() self.sio, file = make_mock_file(self.handler) self.server = NNTPServer(file, 'test.server', *args, **kwargs) return self.server class MockedNNTPWithReaderModeMixin(MockedNNTPTestsMixin): def setUp(self): super().setUp() self.make_server(readermode=True) class NNTPv1Handler: """A handler for RFC 977""" welcome = "200 NNTP mock server" def start(self, readline, push_data): self.in_body = False self.allow_posting = True self._readline = readline self._push_data = push_data self._logged_in = False self._user_sent = False # Our welcome self.handle_welcome() def _decode(self, data): return str(data, "utf-8", "surrogateescape") def process_pending(self): if self.in_body: while True: line = self._readline() if not line: return self.body.append(line) if line == b".\r\n": break try: meth, tokens = self.body_callback meth(*tokens, body=self.body) finally: self.body_callback = None self.body = None self.in_body = False while True: line = self._decode(self._readline()) if not line: return if not line.endswith("\r\n"): raise ValueError("line doesn't end with \\r\\n: {!r}".format(line)) line = line[:-2] cmd, *tokens = line.split() #meth = getattr(self.handler, "handle_" + cmd.upper(), None) meth = getattr(self, "handle_" + cmd.upper(), None) if meth is None: self.handle_unknown() else: try: meth(*tokens) except Exception as e: raise ValueError("command failed: {!r}".format(line)) from e else: if self.in_body: self.body_callback = meth, tokens self.body = [] def expect_body(self): """Flag that the client is expected to post a request body""" self.in_body = True def push_data(self, data): """Push some binary data""" self._push_data(data) def push_lit(self, lit): """Push a string literal""" lit = textwrap.dedent(lit) lit = "\r\n".join(lit.splitlines()) + "\r\n" lit = lit.encode('utf-8') self.push_data(lit) def handle_unknown(self): self.push_lit("500 What?") def handle_welcome(self): self.push_lit(self.welcome) def handle_QUIT(self): self.push_lit("205 Bye!") def handle_DATE(self): self.push_lit("111 20100914001155") def handle_GROUP(self, group): if group == "fr.comp.lang.python": self.push_lit("211 486 761 1265 fr.comp.lang.python") else: self.push_lit("411 No such group {}".format(group)) def handle_HELP(self): self.push_lit("""\ 100 Legal commands authinfo user Name|pass Password|generic date help Report problems to .""") def handle_STAT(self, message_spec=None): if message_spec is None: self.push_lit("412 No newsgroup selected") elif message_spec == "3000234": self.push_lit("223 3000234 <45223423@example.com>") elif message_spec == "<45223423@example.com>": self.push_lit("223 0 <45223423@example.com>") else: self.push_lit("430 No Such Article Found") def handle_NEXT(self): self.push_lit("223 3000237 <668929@example.org> retrieved") def handle_LAST(self): self.push_lit("223 3000234 <45223423@example.com> retrieved") def handle_LIST(self, action=None, param=None): if action is None: self.push_lit("""\ 215 Newsgroups in form "group high low flags". comp.lang.python 0000052340 0000002828 y comp.lang.python.announce 0000001153 0000000993 m free.it.comp.lang.python 0000000002 0000000002 y fr.comp.lang.python 0000001254 0000000760 y free.it.comp.lang.python.learner 0000000000 0000000001 y tw.bbs.comp.lang.python 0000000304 0000000304 y .""") elif action == "ACTIVE": if param == "*distutils*": self.push_lit("""\ 215 Newsgroups in form "group high low flags" gmane.comp.python.distutils.devel 0000014104 0000000001 m gmane.comp.python.distutils.cvs 0000000000 0000000001 m .""") else: self.push_lit("""\ 215 Newsgroups in form "group high low flags" .""") elif action == "OVERVIEW.FMT": self.push_lit("""\ 215 Order of fields in overview database. Subject: From: Date: Message-ID: References: Bytes: Lines: Xref:full .""") elif action == "NEWSGROUPS": assert param is not None if param == "comp.lang.python": self.push_lit("""\ 215 Descriptions in form "group description". comp.lang.python\tThe Python computer language. .""") elif param == "comp.lang.python*": self.push_lit("""\ 215 Descriptions in form "group description". comp.lang.python.announce\tAnnouncements about the Python language. (Moderated) comp.lang.python\tThe Python computer language. .""") else: self.push_lit("""\ 215 Descriptions in form "group description". .""") else: self.push_lit('501 Unknown LIST keyword') def handle_NEWNEWS(self, group, date_str, time_str): # We hard code different return messages depending on passed # argument and date syntax. if (group == "comp.lang.python" and date_str == "20100913" and time_str == "082004"): # Date was passed in RFC 3977 format (NNTP "v2") self.push_lit("""\ 230 list of newsarticles (NNTP v2) created after Mon Sep 13 08:20:04 2010 follows .""") elif (group == "comp.lang.python" and date_str == "100913" and time_str == "082004"): # Date was passed in RFC 977 format (NNTP "v1") self.push_lit("""\ 230 list of newsarticles (NNTP v1) created after Mon Sep 13 08:20:04 2010 follows .""") elif (group == 'comp.lang.python' and date_str in ('20100101', '100101') and time_str == '090000'): self.push_lit('too long line' * 3000 + '\n.') else: self.push_lit("""\ 230 An empty list of newsarticles follows .""") # (Note for experiments: many servers disable NEWNEWS. # As of this writing, sicinfo3.epfl.ch doesn't.) def handle_XOVER(self, message_spec): if message_spec == "57-59": self.push_lit( "224 Overview information for 57-58 follows\n" "57\tRe: ANN: New Plone book with strong Python (and Zope) themes throughout" "\tDoug Hellmann " "\tSat, 19 Jun 2010 18:04:08 -0400" "\t<4FD05F05-F98B-44DC-8111-C6009C925F0C@gmail.com>" "\t\t7103\t16" "\tXref: news.gmane.io gmane.comp.python.authors:57" "\n" "58\tLooking for a few good bloggers" "\tDoug Hellmann " "\tThu, 22 Jul 2010 09:14:14 -0400" "\t" "\t\t6683\t16" "\t" "\n" # A UTF-8 overview line from fr.comp.lang.python "59\tRe: Message d'erreur incompréhensible (par moi)" "\tEric Brunel " "\tWed, 15 Sep 2010 18:09:15 +0200" "\t" "\t<4c90ec87$0$32425$ba4acef3@reader.news.orange.fr>\t1641\t27" "\tXref: saria.nerim.net fr.comp.lang.python:1265" "\n" ".\n") else: self.push_lit("""\ 224 No articles .""") def handle_POST(self, *, body=None): if body is None: if self.allow_posting: self.push_lit("340 Input article; end with .") self.expect_body() else: self.push_lit("440 Posting not permitted") else: assert self.allow_posting self.push_lit("240 Article received OK") self.posted_body = body def handle_IHAVE(self, message_id, *, body=None): if body is None: if (self.allow_posting and message_id == ""): self.push_lit("335 Send it; end with .") self.expect_body() else: self.push_lit("435 Article not wanted") else: assert self.allow_posting self.push_lit("235 Article transferred OK") self.posted_body = body sample_head = """\ From: "Demo User" Subject: I am just a test article Content-Type: text/plain; charset=UTF-8; format=flowed Message-ID: """ sample_body = """\ This is just a test article. ..Here is a dot-starting line. -- Signed by Andr\xe9.""" sample_article = sample_head + "\n\n" + sample_body def handle_ARTICLE(self, message_spec=None): if message_spec is None: self.push_lit("220 3000237 <45223423@example.com>") elif message_spec == "<45223423@example.com>": self.push_lit("220 0 <45223423@example.com>") elif message_spec == "3000234": self.push_lit("220 3000234 <45223423@example.com>") else: self.push_lit("430 No Such Article Found") return self.push_lit(self.sample_article) self.push_lit(".") def handle_HEAD(self, message_spec=None): if message_spec is None: self.push_lit("221 3000237 <45223423@example.com>") elif message_spec == "<45223423@example.com>": self.push_lit("221 0 <45223423@example.com>") elif message_spec == "3000234": self.push_lit("221 3000234 <45223423@example.com>") else: self.push_lit("430 No Such Article Found") return self.push_lit(self.sample_head) self.push_lit(".") def handle_BODY(self, message_spec=None): if message_spec is None: self.push_lit("222 3000237 <45223423@example.com>") elif message_spec == "<45223423@example.com>": self.push_lit("222 0 <45223423@example.com>") elif message_spec == "3000234": self.push_lit("222 3000234 <45223423@example.com>") else: self.push_lit("430 No Such Article Found") return self.push_lit(self.sample_body) self.push_lit(".") def handle_AUTHINFO(self, cred_type, data): if self._logged_in: self.push_lit('502 Already Logged In') elif cred_type == 'user': if self._user_sent: self.push_lit('482 User Credential Already Sent') else: self.push_lit('381 Password Required') self._user_sent = True elif cred_type == 'pass': self.push_lit('281 Login Successful') self._logged_in = True else: raise Exception('Unknown cred type {}'.format(cred_type)) class NNTPv2Handler(NNTPv1Handler): """A handler for RFC 3977 (NNTP "v2")""" def handle_CAPABILITIES(self): fmt = """\ 101 Capability list: VERSION 2 3 IMPLEMENTATION INN 2.5.1{} HDR LIST ACTIVE ACTIVE.TIMES DISTRIB.PATS HEADERS NEWSGROUPS OVERVIEW.FMT OVER POST READER .""" if not self._logged_in: self.push_lit(fmt.format('\n AUTHINFO USER')) else: self.push_lit(fmt.format('')) def handle_MODE(self, _): raise Exception('MODE READER sent despite READER has been advertised') def handle_OVER(self, message_spec=None): return self.handle_XOVER(message_spec) class CapsAfterLoginNNTPv2Handler(NNTPv2Handler): """A handler that allows CAPABILITIES only after login""" def handle_CAPABILITIES(self): if not self._logged_in: self.push_lit('480 You must log in.') else: super().handle_CAPABILITIES() class ModeSwitchingNNTPv2Handler(NNTPv2Handler): """A server that starts in transit mode""" def __init__(self): self._switched = False def handle_CAPABILITIES(self): fmt = """\ 101 Capability list: VERSION 2 3 IMPLEMENTATION INN 2.5.1 HDR LIST ACTIVE ACTIVE.TIMES DISTRIB.PATS HEADERS NEWSGROUPS OVERVIEW.FMT OVER POST {}READER .""" if self._switched: self.push_lit(fmt.format('')) else: self.push_lit(fmt.format('MODE-')) def handle_MODE(self, what): assert not self._switched and what == 'reader' self._switched = True self.push_lit('200 Posting allowed') class NNTPv1v2TestsMixin: def setUp(self): super().setUp() def test_welcome(self): self.assertEqual(self.server.welcome, self.handler.welcome) def test_authinfo(self): if self.nntp_version == 2: self.assertIn('AUTHINFO', self.server._caps) self.server.login('testuser', 'testpw') # if AUTHINFO is gone from _caps we also know that getcapabilities() # has been called after login as it should self.assertNotIn('AUTHINFO', self.server._caps) def test_date(self): resp, date = self.server.date() self.assertEqual(resp, "111 20100914001155") self.assertEqual(date, datetime.datetime(2010, 9, 14, 0, 11, 55)) def test_quit(self): self.assertFalse(self.sio.closed) resp = self.server.quit() self.assertEqual(resp, "205 Bye!") self.assertTrue(self.sio.closed) def test_help(self): resp, help = self.server.help() self.assertEqual(resp, "100 Legal commands") self.assertEqual(help, [ ' authinfo user Name|pass Password|generic ', ' date', ' help', 'Report problems to ', ]) def test_list(self): resp, groups = self.server.list() self.assertEqual(len(groups), 6) g = groups[1] self.assertEqual(g, GroupInfo("comp.lang.python.announce", "0000001153", "0000000993", "m")) resp, groups = self.server.list("*distutils*") self.assertEqual(len(groups), 2) g = groups[0] self.assertEqual(g, GroupInfo("gmane.comp.python.distutils.devel", "0000014104", "0000000001", "m")) def test_stat(self): resp, art_num, message_id = self.server.stat(3000234) self.assertEqual(resp, "223 3000234 <45223423@example.com>") self.assertEqual(art_num, 3000234) self.assertEqual(message_id, "<45223423@example.com>") resp, art_num, message_id = self.server.stat("<45223423@example.com>") self.assertEqual(resp, "223 0 <45223423@example.com>") self.assertEqual(art_num, 0) self.assertEqual(message_id, "<45223423@example.com>") with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.stat("") self.assertEqual(cm.exception.response, "430 No Such Article Found") with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.stat() self.assertEqual(cm.exception.response, "412 No newsgroup selected") def test_next(self): resp, art_num, message_id = self.server.next() self.assertEqual(resp, "223 3000237 <668929@example.org> retrieved") self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<668929@example.org>") def test_last(self): resp, art_num, message_id = self.server.last() self.assertEqual(resp, "223 3000234 <45223423@example.com> retrieved") self.assertEqual(art_num, 3000234) self.assertEqual(message_id, "<45223423@example.com>") def test_description(self): desc = self.server.description("comp.lang.python") self.assertEqual(desc, "The Python computer language.") desc = self.server.description("comp.lang.pythonx") self.assertEqual(desc, "") def test_descriptions(self): resp, groups = self.server.descriptions("comp.lang.python") self.assertEqual(resp, '215 Descriptions in form "group description".') self.assertEqual(groups, { "comp.lang.python": "The Python computer language.", }) resp, groups = self.server.descriptions("comp.lang.python*") self.assertEqual(groups, { "comp.lang.python": "The Python computer language.", "comp.lang.python.announce": "Announcements about the Python language. (Moderated)", }) resp, groups = self.server.descriptions("comp.lang.pythonx") self.assertEqual(groups, {}) def test_group(self): resp, count, first, last, group = self.server.group("fr.comp.lang.python") self.assertTrue(resp.startswith("211 "), resp) self.assertEqual(first, 761) self.assertEqual(last, 1265) self.assertEqual(count, 486) self.assertEqual(group, "fr.comp.lang.python") with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.group("comp.lang.python.devel") exc = cm.exception self.assertTrue(exc.response.startswith("411 No such group"), exc.response) def test_newnews(self): # NEWNEWS comp.lang.python [20]100913 082004 dt = datetime.datetime(2010, 9, 13, 8, 20, 4) resp, ids = self.server.newnews("comp.lang.python", dt) expected = ( "230 list of newsarticles (NNTP v{0}) " "created after Mon Sep 13 08:20:04 2010 follows" ).format(self.nntp_version) self.assertEqual(resp, expected) self.assertEqual(ids, [ "", "", ]) # NEWNEWS fr.comp.lang.python [20]100913 082004 dt = datetime.datetime(2010, 9, 13, 8, 20, 4) resp, ids = self.server.newnews("fr.comp.lang.python", dt) self.assertEqual(resp, "230 An empty list of newsarticles follows") self.assertEqual(ids, []) def _check_article_body(self, lines): self.assertEqual(len(lines), 4) self.assertEqual(lines[-1].decode('utf-8'), "-- Signed by André.") self.assertEqual(lines[-2], b"") self.assertEqual(lines[-3], b".Here is a dot-starting line.") self.assertEqual(lines[-4], b"This is just a test article.") def _check_article_head(self, lines): self.assertEqual(len(lines), 4) self.assertEqual(lines[0], b'From: "Demo User" ') self.assertEqual(lines[3], b"Message-ID: ") def _check_article_data(self, lines): self.assertEqual(len(lines), 9) self._check_article_head(lines[:4]) self._check_article_body(lines[-4:]) self.assertEqual(lines[4], b"") def test_article(self): # ARTICLE resp, info = self.server.article() self.assertEqual(resp, "220 3000237 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_data(lines) # ARTICLE num resp, info = self.server.article(3000234) self.assertEqual(resp, "220 3000234 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000234) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_data(lines) # ARTICLE id resp, info = self.server.article("<45223423@example.com>") self.assertEqual(resp, "220 0 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 0) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_data(lines) # Non-existent id with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.article("") self.assertEqual(cm.exception.response, "430 No Such Article Found") def test_article_file(self): # With a "file" argument f = io.BytesIO() resp, info = self.server.article(file=f) self.assertEqual(resp, "220 3000237 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<45223423@example.com>") self.assertEqual(lines, []) data = f.getvalue() self.assertTrue(data.startswith( b'From: "Demo User" \r\n' b'Subject: I am just a test article\r\n' ), ascii(data)) self.assertTrue(data.endswith( b'This is just a test article.\r\n' b'.Here is a dot-starting line.\r\n' b'\r\n' b'-- Signed by Andr\xc3\xa9.\r\n' ), ascii(data)) def test_head(self): # HEAD resp, info = self.server.head() self.assertEqual(resp, "221 3000237 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_head(lines) # HEAD num resp, info = self.server.head(3000234) self.assertEqual(resp, "221 3000234 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000234) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_head(lines) # HEAD id resp, info = self.server.head("<45223423@example.com>") self.assertEqual(resp, "221 0 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 0) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_head(lines) # Non-existent id with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.head("") self.assertEqual(cm.exception.response, "430 No Such Article Found") def test_head_file(self): f = io.BytesIO() resp, info = self.server.head(file=f) self.assertEqual(resp, "221 3000237 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<45223423@example.com>") self.assertEqual(lines, []) data = f.getvalue() self.assertTrue(data.startswith( b'From: "Demo User" \r\n' b'Subject: I am just a test article\r\n' ), ascii(data)) self.assertFalse(data.endswith( b'This is just a test article.\r\n' b'.Here is a dot-starting line.\r\n' b'\r\n' b'-- Signed by Andr\xc3\xa9.\r\n' ), ascii(data)) def test_body(self): # BODY resp, info = self.server.body() self.assertEqual(resp, "222 3000237 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_body(lines) # BODY num resp, info = self.server.body(3000234) self.assertEqual(resp, "222 3000234 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000234) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_body(lines) # BODY id resp, info = self.server.body("<45223423@example.com>") self.assertEqual(resp, "222 0 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 0) self.assertEqual(message_id, "<45223423@example.com>") self._check_article_body(lines) # Non-existent id with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.body("") self.assertEqual(cm.exception.response, "430 No Such Article Found") def test_body_file(self): f = io.BytesIO() resp, info = self.server.body(file=f) self.assertEqual(resp, "222 3000237 <45223423@example.com>") art_num, message_id, lines = info self.assertEqual(art_num, 3000237) self.assertEqual(message_id, "<45223423@example.com>") self.assertEqual(lines, []) data = f.getvalue() self.assertFalse(data.startswith( b'From: "Demo User" \r\n' b'Subject: I am just a test article\r\n' ), ascii(data)) self.assertTrue(data.endswith( b'This is just a test article.\r\n' b'.Here is a dot-starting line.\r\n' b'\r\n' b'-- Signed by Andr\xc3\xa9.\r\n' ), ascii(data)) def check_over_xover_resp(self, resp, overviews): self.assertTrue(resp.startswith("224 "), resp) self.assertEqual(len(overviews), 3) art_num, over = overviews[0] self.assertEqual(art_num, 57) self.assertEqual(over, { "from": "Doug Hellmann ", "subject": "Re: ANN: New Plone book with strong Python (and Zope) themes throughout", "date": "Sat, 19 Jun 2010 18:04:08 -0400", "message-id": "<4FD05F05-F98B-44DC-8111-C6009C925F0C@gmail.com>", "references": "", ":bytes": "7103", ":lines": "16", "xref": "news.gmane.io gmane.comp.python.authors:57" }) art_num, over = overviews[1] self.assertEqual(over["xref"], None) art_num, over = overviews[2] self.assertEqual(over["subject"], "Re: Message d'erreur incompréhensible (par moi)") def test_xover(self): resp, overviews = self.server.xover(57, 59) self.check_over_xover_resp(resp, overviews) def test_over(self): # In NNTP "v1", this will fallback on XOVER resp, overviews = self.server.over((57, 59)) self.check_over_xover_resp(resp, overviews) sample_post = ( b'From: "Demo User" \r\n' b'Subject: I am just a test article\r\n' b'Content-Type: text/plain; charset=UTF-8; format=flowed\r\n' b'Message-ID: \r\n' b'\r\n' b'This is just a test article.\r\n' b'.Here is a dot-starting line.\r\n' b'\r\n' b'-- Signed by Andr\xc3\xa9.\r\n' ) def _check_posted_body(self): # Check the raw body as received by the server lines = self.handler.posted_body # One additional line for the "." terminator self.assertEqual(len(lines), 10) self.assertEqual(lines[-1], b'.\r\n') self.assertEqual(lines[-2], b'-- Signed by Andr\xc3\xa9.\r\n') self.assertEqual(lines[-3], b'\r\n') self.assertEqual(lines[-4], b'..Here is a dot-starting line.\r\n') self.assertEqual(lines[0], b'From: "Demo User" \r\n') def _check_post_ihave_sub(self, func, *args, file_factory): # First the prepared post with CRLF endings post = self.sample_post func_args = args + (file_factory(post),) self.handler.posted_body = None resp = func(*func_args) self._check_posted_body() # Then the same post with "normal" line endings - they should be # converted by NNTP.post and NNTP.ihave. post = self.sample_post.replace(b"\r\n", b"\n") func_args = args + (file_factory(post),) self.handler.posted_body = None resp = func(*func_args) self._check_posted_body() return resp def check_post_ihave(self, func, success_resp, *args): # With a bytes object resp = self._check_post_ihave_sub(func, *args, file_factory=bytes) self.assertEqual(resp, success_resp) # With a bytearray object resp = self._check_post_ihave_sub(func, *args, file_factory=bytearray) self.assertEqual(resp, success_resp) # With a file object resp = self._check_post_ihave_sub(func, *args, file_factory=io.BytesIO) self.assertEqual(resp, success_resp) # With an iterable of terminated lines def iterlines(b): return iter(b.splitlines(keepends=True)) resp = self._check_post_ihave_sub(func, *args, file_factory=iterlines) self.assertEqual(resp, success_resp) # With an iterable of non-terminated lines def iterlines(b): return iter(b.splitlines(keepends=False)) resp = self._check_post_ihave_sub(func, *args, file_factory=iterlines) self.assertEqual(resp, success_resp) def test_post(self): self.check_post_ihave(self.server.post, "240 Article received OK") self.handler.allow_posting = False with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.post(self.sample_post) self.assertEqual(cm.exception.response, "440 Posting not permitted") def test_ihave(self): self.check_post_ihave(self.server.ihave, "235 Article transferred OK", "") with self.assertRaises(nntplib.NNTPTemporaryError) as cm: self.server.ihave("", self.sample_post) self.assertEqual(cm.exception.response, "435 Article not wanted") def test_too_long_lines(self): dt = datetime.datetime(2010, 1, 1, 9, 0, 0) self.assertRaises(nntplib.NNTPDataError, self.server.newnews, "comp.lang.python", dt) class NNTPv1Tests(NNTPv1v2TestsMixin, MockedNNTPTestsMixin, unittest.TestCase): """Tests an NNTP v1 server (no capabilities).""" nntp_version = 1 handler_class = NNTPv1Handler def test_caps(self): caps = self.server.getcapabilities() self.assertEqual(caps, {}) self.assertEqual(self.server.nntp_version, 1) self.assertEqual(self.server.nntp_implementation, None) class NNTPv2Tests(NNTPv1v2TestsMixin, MockedNNTPTestsMixin, unittest.TestCase): """Tests an NNTP v2 server (with capabilities).""" nntp_version = 2 handler_class = NNTPv2Handler def test_caps(self): caps = self.server.getcapabilities() self.assertEqual(caps, { 'VERSION': ['2', '3'], 'IMPLEMENTATION': ['INN', '2.5.1'], 'AUTHINFO': ['USER'], 'HDR': [], 'LIST': ['ACTIVE', 'ACTIVE.TIMES', 'DISTRIB.PATS', 'HEADERS', 'NEWSGROUPS', 'OVERVIEW.FMT'], 'OVER': [], 'POST': [], 'READER': [], }) self.assertEqual(self.server.nntp_version, 3) self.assertEqual(self.server.nntp_implementation, 'INN 2.5.1') class CapsAfterLoginNNTPv2Tests(MockedNNTPTestsMixin, unittest.TestCase): """Tests a probably NNTP v2 server with capabilities only after login.""" nntp_version = 2 handler_class = CapsAfterLoginNNTPv2Handler def test_caps_only_after_login(self): self.assertEqual(self.server._caps, {}) self.server.login('testuser', 'testpw') self.assertIn('VERSION', self.server._caps) class SendReaderNNTPv2Tests(MockedNNTPWithReaderModeMixin, unittest.TestCase): """Same tests as for v2 but we tell NTTP to send MODE READER to a server that isn't in READER mode by default.""" nntp_version = 2 handler_class = ModeSwitchingNNTPv2Handler def test_we_are_in_reader_mode_after_connect(self): self.assertIn('READER', self.server._caps) class MiscTests(unittest.TestCase): def test_decode_header(self): def gives(a, b): self.assertEqual(nntplib.decode_header(a), b) gives("" , "") gives("a plain header", "a plain header") gives(" with extra spaces ", " with extra spaces ") gives("=?ISO-8859-15?Q?D=E9buter_en_Python?=", "Débuter en Python") gives("=?utf-8?q?Re=3A_=5Bsqlite=5D_probl=C3=A8me_avec_ORDER_BY_sur_des_cha?=" " =?utf-8?q?=C3=AEnes_de_caract=C3=A8res_accentu=C3=A9es?=", "Re: [sqlite] problème avec ORDER BY sur des chaînes de caractères accentuées") gives("Re: =?UTF-8?B?cHJvYmzDqG1lIGRlIG1hdHJpY2U=?=", "Re: problème de matrice") # A natively utf-8 header (found in the real world!) gives("Re: Message d'erreur incompréhensible (par moi)", "Re: Message d'erreur incompréhensible (par moi)") def test_parse_overview_fmt(self): # The minimal (default) response lines = ["Subject:", "From:", "Date:", "Message-ID:", "References:", ":bytes", ":lines"] self.assertEqual(nntplib._parse_overview_fmt(lines), ["subject", "from", "date", "message-id", "references", ":bytes", ":lines"]) # The minimal response using alternative names lines = ["Subject:", "From:", "Date:", "Message-ID:", "References:", "Bytes:", "Lines:"] self.assertEqual(nntplib._parse_overview_fmt(lines), ["subject", "from", "date", "message-id", "references", ":bytes", ":lines"]) # Variations in casing lines = ["subject:", "FROM:", "DaTe:", "message-ID:", "References:", "BYTES:", "Lines:"] self.assertEqual(nntplib._parse_overview_fmt(lines), ["subject", "from", "date", "message-id", "references", ":bytes", ":lines"]) # First example from RFC 3977 lines = ["Subject:", "From:", "Date:", "Message-ID:", "References:", ":bytes", ":lines", "Xref:full", "Distribution:full"] self.assertEqual(nntplib._parse_overview_fmt(lines), ["subject", "from", "date", "message-id", "references", ":bytes", ":lines", "xref", "distribution"]) # Second example from RFC 3977 lines = ["Subject:", "From:", "Date:", "Message-ID:", "References:", "Bytes:", "Lines:", "Xref:FULL", "Distribution:FULL"] self.assertEqual(nntplib._parse_overview_fmt(lines), ["subject", "from", "date", "message-id", "references", ":bytes", ":lines", "xref", "distribution"]) # A classic response from INN lines = ["Subject:", "From:", "Date:", "Message-ID:", "References:", "Bytes:", "Lines:", "Xref:full"] self.assertEqual(nntplib._parse_overview_fmt(lines), ["subject", "from", "date", "message-id", "references", ":bytes", ":lines", "xref"]) def test_parse_overview(self): fmt = nntplib._DEFAULT_OVERVIEW_FMT + ["xref"] # First example from RFC 3977 lines = [ '3000234\tI am just a test article\t"Demo User" ' '\t6 Oct 1998 04:38:40 -0500\t' '<45223423@example.com>\t<45454@example.net>\t1234\t' '17\tXref: news.example.com misc.test:3000363', ] overview = nntplib._parse_overview(lines, fmt) (art_num, fields), = overview self.assertEqual(art_num, 3000234) self.assertEqual(fields, { 'subject': 'I am just a test article', 'from': '"Demo User" ', 'date': '6 Oct 1998 04:38:40 -0500', 'message-id': '<45223423@example.com>', 'references': '<45454@example.net>', ':bytes': '1234', ':lines': '17', 'xref': 'news.example.com misc.test:3000363', }) # Second example; here the "Xref" field is totally absent (including # the header name) and comes out as None lines = [ '3000234\tI am just a test article\t"Demo User" ' '\t6 Oct 1998 04:38:40 -0500\t' '<45223423@example.com>\t<45454@example.net>\t1234\t' '17\t\t', ] overview = nntplib._parse_overview(lines, fmt) (art_num, fields), = overview self.assertEqual(fields['xref'], None) # Third example; the "Xref" is an empty string, while "references" # is a single space. lines = [ '3000234\tI am just a test article\t"Demo User" ' '\t6 Oct 1998 04:38:40 -0500\t' '<45223423@example.com>\t \t1234\t' '17\tXref: \t', ] overview = nntplib._parse_overview(lines, fmt) (art_num, fields), = overview self.assertEqual(fields['references'], ' ') self.assertEqual(fields['xref'], '') def test_parse_datetime(self): def gives(a, b, *c): self.assertEqual(nntplib._parse_datetime(a, b), datetime.datetime(*c)) # Output of DATE command gives("19990623135624", None, 1999, 6, 23, 13, 56, 24) # Variations gives("19990623", "135624", 1999, 6, 23, 13, 56, 24) gives("990623", "135624", 1999, 6, 23, 13, 56, 24) gives("090623", "135624", 2009, 6, 23, 13, 56, 24) def test_unparse_datetime(self): # Test non-legacy mode # 1) with a datetime def gives(y, M, d, h, m, s, date_str, time_str): dt = datetime.datetime(y, M, d, h, m, s) self.assertEqual(nntplib._unparse_datetime(dt), (date_str, time_str)) self.assertEqual(nntplib._unparse_datetime(dt, False), (date_str, time_str)) gives(1999, 6, 23, 13, 56, 24, "19990623", "135624") gives(2000, 6, 23, 13, 56, 24, "20000623", "135624") gives(2010, 6, 5, 1, 2, 3, "20100605", "010203") # 2) with a date def gives(y, M, d, date_str, time_str): dt = datetime.date(y, M, d) self.assertEqual(nntplib._unparse_datetime(dt), (date_str, time_str)) self.assertEqual(nntplib._unparse_datetime(dt, False), (date_str, time_str)) gives(1999, 6, 23, "19990623", "000000") gives(2000, 6, 23, "20000623", "000000") gives(2010, 6, 5, "20100605", "000000") def test_unparse_datetime_legacy(self): # Test legacy mode (RFC 977) # 1) with a datetime def gives(y, M, d, h, m, s, date_str, time_str): dt = datetime.datetime(y, M, d, h, m, s) self.assertEqual(nntplib._unparse_datetime(dt, True), (date_str, time_str)) gives(1999, 6, 23, 13, 56, 24, "990623", "135624") gives(2000, 6, 23, 13, 56, 24, "000623", "135624") gives(2010, 6, 5, 1, 2, 3, "100605", "010203") # 2) with a date def gives(y, M, d, date_str, time_str): dt = datetime.date(y, M, d) self.assertEqual(nntplib._unparse_datetime(dt, True), (date_str, time_str)) gives(1999, 6, 23, "990623", "000000") gives(2000, 6, 23, "000623", "000000") gives(2010, 6, 5, "100605", "000000") @unittest.skipUnless(ssl, 'requires SSL support') def test_ssl_support(self): self.assertTrue(hasattr(nntplib, 'NNTP_SSL')) class PublicAPITests(unittest.TestCase): """Ensures that the correct values are exposed in the public API.""" def test_module_all_attribute(self): self.assertTrue(hasattr(nntplib, '__all__')) target_api = ['NNTP', 'NNTPError', 'NNTPReplyError', 'NNTPTemporaryError', 'NNTPPermanentError', 'NNTPProtocolError', 'NNTPDataError', 'decode_header'] if ssl is not None: target_api.append('NNTP_SSL') self.assertEqual(set(nntplib.__all__), set(target_api)) class MockSocketTests(unittest.TestCase): """Tests involving a mock socket object Used where the _NNTPServerIO file object is not enough.""" nntp_class = nntplib.NNTP def check_constructor_error_conditions( self, handler_class, expected_error_type, expected_error_msg, login=None, password=None): class mock_socket_module: def create_connection(address, timeout): return MockSocket() class MockSocket: def close(self): nonlocal socket_closed socket_closed = True def makefile(socket, mode): handler = handler_class() _, file = make_mock_file(handler) files.append(file) return file socket_closed = False files = [] with patch('nntplib.socket', mock_socket_module), \ self.assertRaisesRegex(expected_error_type, expected_error_msg): self.nntp_class('dummy', user=login, password=password) self.assertTrue(socket_closed) for f in files: self.assertTrue(f.closed) def test_bad_welcome(self): #Test a bad welcome message class Handler(NNTPv1Handler): welcome = 'Bad Welcome' self.check_constructor_error_conditions( Handler, nntplib.NNTPProtocolError, Handler.welcome) def test_service_temporarily_unavailable(self): #Test service temporarily unavailable class Handler(NNTPv1Handler): welcome = '400 Service temporarily unavailable' self.check_constructor_error_conditions( Handler, nntplib.NNTPTemporaryError, Handler.welcome) def test_service_permanently_unavailable(self): #Test service permanently unavailable class Handler(NNTPv1Handler): welcome = '502 Service permanently unavailable' self.check_constructor_error_conditions( Handler, nntplib.NNTPPermanentError, Handler.welcome) def test_bad_capabilities(self): #Test a bad capabilities response class Handler(NNTPv1Handler): def handle_CAPABILITIES(self): self.push_lit(capabilities_response) capabilities_response = '201 bad capability' self.check_constructor_error_conditions( Handler, nntplib.NNTPReplyError, capabilities_response) def test_login_aborted(self): #Test a bad authinfo response login = 't@e.com' password = 'python' class Handler(NNTPv1Handler): def handle_AUTHINFO(self, *args): self.push_lit(authinfo_response) authinfo_response = '503 Mechanism not recognized' self.check_constructor_error_conditions( Handler, nntplib.NNTPPermanentError, authinfo_response, login, password) class bypass_context: """Bypass encryption and actual SSL module""" def wrap_socket(sock, **args): return sock @unittest.skipUnless(ssl, 'requires SSL support') class MockSslTests(MockSocketTests): @staticmethod def nntp_class(*pos, **kw): return nntplib.NNTP_SSL(*pos, ssl_context=bypass_context, **kw) class LocalServerTests(unittest.TestCase): def setUp(self): sock = socket.socket() port = socket_helper.bind_port(sock) sock.listen() self.background = threading.Thread( target=self.run_server, args=(sock,)) self.background.start() self.addCleanup(self.background.join) self.nntp = NNTP(socket_helper.HOST, port, usenetrc=False).__enter__() self.addCleanup(self.nntp.__exit__, None, None, None) def run_server(self, sock): # Could be generalized to handle more commands in separate methods with sock: [client, _] = sock.accept() with contextlib.ExitStack() as cleanup: cleanup.enter_context(client) reader = cleanup.enter_context(client.makefile('rb')) client.sendall(b'200 Server ready\r\n') while True: cmd = reader.readline() if cmd == b'CAPABILITIES\r\n': client.sendall( b'101 Capability list:\r\n' b'VERSION 2\r\n' b'STARTTLS\r\n' b'.\r\n' ) elif cmd == b'STARTTLS\r\n': reader.close() client.sendall(b'382 Begin TLS negotiation now\r\n') context = ssl.SSLContext() context.load_cert_chain(certfile) client = context.wrap_socket( client, server_side=True) cleanup.enter_context(client) reader = cleanup.enter_context(client.makefile('rb')) elif cmd == b'QUIT\r\n': client.sendall(b'205 Bye!\r\n') break else: raise ValueError('Unexpected command {!r}'.format(cmd)) @unittest.skipUnless(ssl, 'requires SSL support') def test_starttls(self): file = self.nntp.file sock = self.nntp.sock self.nntp.starttls() # Check that the socket and internal pseudo-file really were # changed. self.assertNotEqual(file, self.nntp.file) self.assertNotEqual(sock, self.nntp.sock) # Check that the new socket really is an SSL one self.assertIsInstance(self.nntp.sock, ssl.SSLSocket) # Check that trying starttls when it's already active fails. self.assertRaises(ValueError, self.nntp.starttls) if __name__ == "__main__": unittest.main()