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cpython/Lib/test/test_urllib2_localnet.py

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import base64
import os
import email
import urllib.parse
import urllib.request
import http.server
import threading
import unittest
import hashlib
from test.support import hashlib_helper
from test.support import threading_helper
from test.support import warnings_helper
try:
import ssl
except ImportError:
ssl = None
here = os.path.dirname(__file__)
# Self-signed cert file for 'localhost'
CERT_localhost = os.path.join(here, 'keycert.pem')
# Self-signed cert file for 'fakehostname'
CERT_fakehostname = os.path.join(here, 'keycert2.pem')
# Loopback http server infrastructure
class LoopbackHttpServer(http.server.HTTPServer):
"""HTTP server w/ a few modifications that make it useful for
loopback testing purposes.
"""
def __init__(self, server_address, RequestHandlerClass):
http.server.HTTPServer.__init__(self,
server_address,
RequestHandlerClass)
# Set the timeout of our listening socket really low so
# that we can stop the server easily.
self.socket.settimeout(0.1)
def get_request(self):
"""HTTPServer method, overridden."""
request, client_address = self.socket.accept()
# It's a loopback connection, so setting the timeout
# really low shouldn't affect anything, but should make
# deadlocks less likely to occur.
request.settimeout(10.0)
return (request, client_address)
class LoopbackHttpServerThread(threading.Thread):
"""Stoppable thread that runs a loopback http server."""
def __init__(self, request_handler):
threading.Thread.__init__(self)
self._stop_server = False
self.ready = threading.Event()
request_handler.protocol_version = "HTTP/1.0"
self.httpd = LoopbackHttpServer(("127.0.0.1", 0),
request_handler)
self.port = self.httpd.server_port
def stop(self):
"""Stops the webserver if it's currently running."""
self._stop_server = True
self.join()
self.httpd.server_close()
def run(self):
self.ready.set()
while not self._stop_server:
self.httpd.handle_request()
# Authentication infrastructure
class DigestAuthHandler:
"""Handler for performing digest authentication."""
def __init__(self):
self._request_num = 0
self._nonces = []
self._users = {}
self._realm_name = "Test Realm"
self._qop = "auth"
def set_qop(self, qop):
self._qop = qop
def set_users(self, users):
assert isinstance(users, dict)
self._users = users
def set_realm(self, realm):
self._realm_name = realm
def _generate_nonce(self):
self._request_num += 1
nonce = hashlib.md5(str(self._request_num).encode("ascii")).hexdigest()
self._nonces.append(nonce)
return nonce
def _create_auth_dict(self, auth_str):
first_space_index = auth_str.find(" ")
auth_str = auth_str[first_space_index+1:]
parts = auth_str.split(",")
auth_dict = {}
for part in parts:
name, value = part.split("=")
name = name.strip()
if value[0] == '"' and value[-1] == '"':
value = value[1:-1]
else:
value = value.strip()
auth_dict[name] = value
return auth_dict
def _validate_auth(self, auth_dict, password, method, uri):
final_dict = {}
final_dict.update(auth_dict)
final_dict["password"] = password
final_dict["method"] = method
final_dict["uri"] = uri
HA1_str = "%(username)s:%(realm)s:%(password)s" % final_dict
HA1 = hashlib.md5(HA1_str.encode("ascii")).hexdigest()
HA2_str = "%(method)s:%(uri)s" % final_dict
HA2 = hashlib.md5(HA2_str.encode("ascii")).hexdigest()
final_dict["HA1"] = HA1
final_dict["HA2"] = HA2
response_str = "%(HA1)s:%(nonce)s:%(nc)s:" \
"%(cnonce)s:%(qop)s:%(HA2)s" % final_dict
response = hashlib.md5(response_str.encode("ascii")).hexdigest()
return response == auth_dict["response"]
def _return_auth_challenge(self, request_handler):
request_handler.send_response(407, "Proxy Authentication Required")
request_handler.send_header("Content-Type", "text/html")
request_handler.send_header(
'Proxy-Authenticate', 'Digest realm="%s", '
'qop="%s",'
'nonce="%s", ' % \
(self._realm_name, self._qop, self._generate_nonce()))
# XXX: Not sure if we're supposed to add this next header or
# not.
#request_handler.send_header('Connection', 'close')
request_handler.end_headers()
request_handler.wfile.write(b"Proxy Authentication Required.")
return False
def handle_request(self, request_handler):
"""Performs digest authentication on the given HTTP request
handler. Returns True if authentication was successful, False
otherwise.
If no users have been set, then digest auth is effectively
disabled and this method will always return True.
"""
if len(self._users) == 0:
return True
if "Proxy-Authorization" not in request_handler.headers:
return self._return_auth_challenge(request_handler)
else:
auth_dict = self._create_auth_dict(
request_handler.headers["Proxy-Authorization"]
)
if auth_dict["username"] in self._users:
password = self._users[ auth_dict["username"] ]
else:
return self._return_auth_challenge(request_handler)
if not auth_dict.get("nonce") in self._nonces:
return self._return_auth_challenge(request_handler)
else:
self._nonces.remove(auth_dict["nonce"])
auth_validated = False
# MSIE uses short_path in its validation, but Python's
# urllib.request uses the full path, so we're going to see if
# either of them works here.
for path in [request_handler.path, request_handler.short_path]:
if self._validate_auth(auth_dict,
password,
request_handler.command,
path):
auth_validated = True
if not auth_validated:
return self._return_auth_challenge(request_handler)
return True
class BasicAuthHandler(http.server.BaseHTTPRequestHandler):
"""Handler for performing basic authentication."""
# Server side values
USER = 'testUser'
PASSWD = 'testPass'
REALM = 'Test'
USER_PASSWD = "%s:%s" % (USER, PASSWD)
ENCODED_AUTH = base64.b64encode(USER_PASSWD.encode('ascii')).decode('ascii')
def __init__(self, *args, **kwargs):
http.server.BaseHTTPRequestHandler.__init__(self, *args, **kwargs)
def log_message(self, format, *args):
# Suppress console log message
pass
def do_HEAD(self):
self.send_response(200)
self.send_header("Content-type", "text/html")
self.end_headers()
def do_AUTHHEAD(self):
self.send_response(401)
self.send_header("WWW-Authenticate", "Basic realm=\"%s\"" % self.REALM)
self.send_header("Content-type", "text/html")
self.end_headers()
def do_GET(self):
if not self.headers.get("Authorization", ""):
self.do_AUTHHEAD()
self.wfile.write(b"No Auth header received")
elif self.headers.get(
"Authorization", "") == "Basic " + self.ENCODED_AUTH:
self.send_response(200)
self.end_headers()
self.wfile.write(b"It works")
else:
# Request Unauthorized
self.do_AUTHHEAD()
# Proxy test infrastructure
class FakeProxyHandler(http.server.BaseHTTPRequestHandler):
"""This is a 'fake proxy' that makes it look like the entire
internet has gone down due to a sudden zombie invasion. It main
utility is in providing us with authentication support for
testing.
"""
def __init__(self, digest_auth_handler, *args, **kwargs):
# This has to be set before calling our parent's __init__(), which will
# try to call do_GET().
self.digest_auth_handler = digest_auth_handler
http.server.BaseHTTPRequestHandler.__init__(self, *args, **kwargs)
def log_message(self, format, *args):
# Uncomment the next line for debugging.
# sys.stderr.write(format % args)
pass
def do_GET(self):
(scm, netloc, path, params, query, fragment) = urllib.parse.urlparse(
self.path, "http")
self.short_path = path
if self.digest_auth_handler.handle_request(self):
self.send_response(200, "OK")
self.send_header("Content-Type", "text/html")
self.end_headers()
self.wfile.write(bytes("You've reached %s!<BR>" % self.path,
"ascii"))
self.wfile.write(b"Our apologies, but our server is down due to "
b"a sudden zombie invasion.")
# Test cases
class BasicAuthTests(unittest.TestCase):
USER = "testUser"
PASSWD = "testPass"
INCORRECT_PASSWD = "Incorrect"
REALM = "Test"
def setUp(self):
super(BasicAuthTests, self).setUp()
# With Basic Authentication
def http_server_with_basic_auth_handler(*args, **kwargs):
return BasicAuthHandler(*args, **kwargs)
self.server = LoopbackHttpServerThread(http_server_with_basic_auth_handler)
self.addCleanup(self.stop_server)
self.server_url = 'http://127.0.0.1:%s' % self.server.port
self.server.start()
self.server.ready.wait()
def stop_server(self):
self.server.stop()
self.server = None
def tearDown(self):
super(BasicAuthTests, self).tearDown()
def test_basic_auth_success(self):
ah = urllib.request.HTTPBasicAuthHandler()
ah.add_password(self.REALM, self.server_url, self.USER, self.PASSWD)
urllib.request.install_opener(urllib.request.build_opener(ah))
try:
self.assertTrue(urllib.request.urlopen(self.server_url))
except urllib.error.HTTPError:
self.fail("Basic auth failed for the url: %s" % self.server_url)
def test_basic_auth_httperror(self):
ah = urllib.request.HTTPBasicAuthHandler()
ah.add_password(self.REALM, self.server_url, self.USER, self.INCORRECT_PASSWD)
urllib.request.install_opener(urllib.request.build_opener(ah))
self.assertRaises(urllib.error.HTTPError, urllib.request.urlopen, self.server_url)
@hashlib_helper.requires_hashdigest("md5")
class ProxyAuthTests(unittest.TestCase):
URL = "http://localhost"
USER = "tester"
PASSWD = "test123"
REALM = "TestRealm"
def setUp(self):
super(ProxyAuthTests, self).setUp()
# Ignore proxy bypass settings in the environment.
def restore_environ(old_environ):
os.environ.clear()
os.environ.update(old_environ)
self.addCleanup(restore_environ, os.environ.copy())
os.environ['NO_PROXY'] = ''
os.environ['no_proxy'] = ''
self.digest_auth_handler = DigestAuthHandler()
self.digest_auth_handler.set_users({self.USER: self.PASSWD})
self.digest_auth_handler.set_realm(self.REALM)
# With Digest Authentication.
def create_fake_proxy_handler(*args, **kwargs):
return FakeProxyHandler(self.digest_auth_handler, *args, **kwargs)
self.server = LoopbackHttpServerThread(create_fake_proxy_handler)
self.addCleanup(self.stop_server)
self.server.start()
self.server.ready.wait()
proxy_url = "http://127.0.0.1:%d" % self.server.port
handler = urllib.request.ProxyHandler({"http" : proxy_url})
self.proxy_digest_handler = urllib.request.ProxyDigestAuthHandler()
self.opener = urllib.request.build_opener(
handler, self.proxy_digest_handler)
def stop_server(self):
self.server.stop()
self.server = None
def test_proxy_with_bad_password_raises_httperror(self):
self.proxy_digest_handler.add_password(self.REALM, self.URL,
self.USER, self.PASSWD+"bad")
self.digest_auth_handler.set_qop("auth")
self.assertRaises(urllib.error.HTTPError,
self.opener.open,
self.URL)
def test_proxy_with_no_password_raises_httperror(self):
self.digest_auth_handler.set_qop("auth")
self.assertRaises(urllib.error.HTTPError,
self.opener.open,
self.URL)
def test_proxy_qop_auth_works(self):
self.proxy_digest_handler.add_password(self.REALM, self.URL,
self.USER, self.PASSWD)
self.digest_auth_handler.set_qop("auth")
with self.opener.open(self.URL) as result:
while result.read():
pass
def test_proxy_qop_auth_int_works_or_throws_urlerror(self):
self.proxy_digest_handler.add_password(self.REALM, self.URL,
self.USER, self.PASSWD)
self.digest_auth_handler.set_qop("auth-int")
try:
result = self.opener.open(self.URL)
except urllib.error.URLError:
# It's okay if we don't support auth-int, but we certainly
# shouldn't receive any kind of exception here other than
# a URLError.
pass
else:
with result:
while result.read():
pass
def GetRequestHandler(responses):
class FakeHTTPRequestHandler(http.server.BaseHTTPRequestHandler):
server_version = "TestHTTP/"
requests = []
headers_received = []
port = 80
def do_GET(self):
body = self.send_head()
while body:
done = self.wfile.write(body)
body = body[done:]
def do_POST(self):
content_length = self.headers["Content-Length"]
post_data = self.rfile.read(int(content_length))
self.do_GET()
self.requests.append(post_data)
def send_head(self):
FakeHTTPRequestHandler.headers_received = self.headers
self.requests.append(self.path)
response_code, headers, body = responses.pop(0)
self.send_response(response_code)
for (header, value) in headers:
self.send_header(header, value % {'port':self.port})
if body:
self.send_header("Content-type", "text/plain")
self.end_headers()
return body
self.end_headers()
def log_message(self, *args):
pass
return FakeHTTPRequestHandler
class TestUrlopen(unittest.TestCase):
"""Tests urllib.request.urlopen using the network.
These tests are not exhaustive. Assuming that testing using files does a
good job overall of some of the basic interface features. There are no
tests exercising the optional 'data' and 'proxies' arguments. No tests
for transparent redirection have been written.
"""
def setUp(self):
super(TestUrlopen, self).setUp()
# clear _opener global variable
self.addCleanup(urllib.request.urlcleanup)
# Ignore proxies for localhost tests.
def restore_environ(old_environ):
os.environ.clear()
os.environ.update(old_environ)
self.addCleanup(restore_environ, os.environ.copy())
os.environ['NO_PROXY'] = '*'
os.environ['no_proxy'] = '*'
def urlopen(self, url, data=None, **kwargs):
l = []
f = urllib.request.urlopen(url, data, **kwargs)
try:
# Exercise various methods
l.extend(f.readlines(200))
l.append(f.readline())
l.append(f.read(1024))
l.append(f.read())
finally:
f.close()
return b"".join(l)
def stop_server(self):
self.server.stop()
self.server = None
def start_server(self, responses=None):
if responses is None:
responses = [(200, [], b"we don't care")]
handler = GetRequestHandler(responses)
self.server = LoopbackHttpServerThread(handler)
self.addCleanup(self.stop_server)
self.server.start()
self.server.ready.wait()
port = self.server.port
handler.port = port
return handler
def start_https_server(self, responses=None, **kwargs):
if not hasattr(urllib.request, 'HTTPSHandler'):
self.skipTest('ssl support required')
from test.ssl_servers import make_https_server
if responses is None:
responses = [(200, [], b"we care a bit")]
handler = GetRequestHandler(responses)
server = make_https_server(self, handler_class=handler, **kwargs)
handler.port = server.port
return handler
def test_redirection(self):
expected_response = b"We got here..."
responses = [
(302, [("Location", "http://localhost:%(port)s/somewhere_else")],
""),
(200, [], expected_response)
]
handler = self.start_server(responses)
data = self.urlopen("http://localhost:%s/" % handler.port)
self.assertEqual(data, expected_response)
self.assertEqual(handler.requests, ["/", "/somewhere_else"])
def test_chunked(self):
expected_response = b"hello world"
chunked_start = (
b'a\r\n'
b'hello worl\r\n'
b'1\r\n'
b'd\r\n'
b'0\r\n'
)
response = [(200, [("Transfer-Encoding", "chunked")], chunked_start)]
handler = self.start_server(response)
data = self.urlopen("http://localhost:%s/" % handler.port)
self.assertEqual(data, expected_response)
def test_404(self):
expected_response = b"Bad bad bad..."
handler = self.start_server([(404, [], expected_response)])
try:
self.urlopen("http://localhost:%s/weeble" % handler.port)
except urllib.error.URLError as f:
data = f.read()
f.close()
else:
self.fail("404 should raise URLError")
self.assertEqual(data, expected_response)
self.assertEqual(handler.requests, ["/weeble"])
def test_200(self):
expected_response = b"pycon 2008..."
handler = self.start_server([(200, [], expected_response)])
data = self.urlopen("http://localhost:%s/bizarre" % handler.port)
self.assertEqual(data, expected_response)
self.assertEqual(handler.requests, ["/bizarre"])
def test_200_with_parameters(self):
expected_response = b"pycon 2008..."
handler = self.start_server([(200, [], expected_response)])
data = self.urlopen("http://localhost:%s/bizarre" % handler.port,
b"get=with_feeling")
self.assertEqual(data, expected_response)
self.assertEqual(handler.requests, ["/bizarre", b"get=with_feeling"])
def test_https(self):
handler = self.start_https_server()
context = ssl.create_default_context(cafile=CERT_localhost)
data = self.urlopen("https://localhost:%s/bizarre" % handler.port, context=context)
self.assertEqual(data, b"we care a bit")
def test_https_with_cafile(self):
handler = self.start_https_server(certfile=CERT_localhost)
with warnings_helper.check_warnings(('', DeprecationWarning)):
# Good cert
data = self.urlopen("https://localhost:%s/bizarre" % handler.port,
cafile=CERT_localhost)
self.assertEqual(data, b"we care a bit")
# Bad cert
with self.assertRaises(urllib.error.URLError) as cm:
self.urlopen("https://localhost:%s/bizarre" % handler.port,
cafile=CERT_fakehostname)
# Good cert, but mismatching hostname
handler = self.start_https_server(certfile=CERT_fakehostname)
with self.assertRaises(urllib.error.URLError) as cm:
self.urlopen("https://localhost:%s/bizarre" % handler.port,
cafile=CERT_fakehostname)
def test_https_with_cadefault(self):
handler = self.start_https_server(certfile=CERT_localhost)
# Self-signed cert should fail verification with system certificate store
with warnings_helper.check_warnings(('', DeprecationWarning)):
with self.assertRaises(urllib.error.URLError) as cm:
self.urlopen("https://localhost:%s/bizarre" % handler.port,
cadefault=True)
def test_https_sni(self):
if ssl is None:
self.skipTest("ssl module required")
if not ssl.HAS_SNI:
self.skipTest("SNI support required in OpenSSL")
sni_name = None
def cb_sni(ssl_sock, server_name, initial_context):
nonlocal sni_name
sni_name = server_name
context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
context.set_servername_callback(cb_sni)
handler = self.start_https_server(context=context, certfile=CERT_localhost)
context = ssl.create_default_context(cafile=CERT_localhost)
self.urlopen("https://localhost:%s" % handler.port, context=context)
self.assertEqual(sni_name, "localhost")
def test_sending_headers(self):
handler = self.start_server()
req = urllib.request.Request("http://localhost:%s/" % handler.port,
headers={"Range": "bytes=20-39"})
with urllib.request.urlopen(req):
pass
self.assertEqual(handler.headers_received["Range"], "bytes=20-39")
def test_basic(self):
handler = self.start_server()
with urllib.request.urlopen("http://localhost:%s" % handler.port) as open_url:
for attr in ("read", "close", "info", "geturl"):
self.assertTrue(hasattr(open_url, attr), "object returned from "
"urlopen lacks the %s attribute" % attr)
self.assertTrue(open_url.read(), "calling 'read' failed")
def test_info(self):
handler = self.start_server()
open_url = urllib.request.urlopen(
"http://localhost:%s" % handler.port)
with open_url:
info_obj = open_url.info()
self.assertIsInstance(info_obj, email.message.Message,
"object returned by 'info' is not an "
"instance of email.message.Message")
self.assertEqual(info_obj.get_content_subtype(), "plain")
def test_geturl(self):
# Make sure same URL as opened is returned by geturl.
handler = self.start_server()
open_url = urllib.request.urlopen("http://localhost:%s" % handler.port)
with open_url:
url = open_url.geturl()
self.assertEqual(url, "http://localhost:%s" % handler.port)
def test_iteration(self):
expected_response = b"pycon 2008..."
handler = self.start_server([(200, [], expected_response)])
data = urllib.request.urlopen("http://localhost:%s" % handler.port)
for line in data:
self.assertEqual(line, expected_response)
def test_line_iteration(self):
lines = [b"We\n", b"got\n", b"here\n", b"verylong " * 8192 + b"\n"]
expected_response = b"".join(lines)
handler = self.start_server([(200, [], expected_response)])
data = urllib.request.urlopen("http://localhost:%s" % handler.port)
for index, line in enumerate(data):
self.assertEqual(line, lines[index],
"Fetched line number %s doesn't match expected:\n"
" Expected length was %s, got %s" %
(index, len(lines[index]), len(line)))
self.assertEqual(index + 1, len(lines))
def setUpModule():
thread_info = threading_helper.threading_setup()
unittest.addModuleCleanup(threading_helper.threading_cleanup, *thread_info)
if __name__ == "__main__":
unittest.main()
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