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cpython/Lib/test/test_urllib2_localnet.py

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#!/usr/bin/env python3
import os
import email
import urllib.parse
import urllib.request
import http.server
import unittest
import hashlib
from test import support
threading = support.import_module('threading')
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)
#print "Serving HTTP on %s port %s" % (self.httpd.server_name,
# self.httpd.server_port)
self.port = self.httpd.server_port
def stop(self):
"""Stops the webserver if it's currently running."""
# Set the stop flag.
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
# 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 ProxyAuthTests(unittest.TestCase):
URL = "http://localhost"
USER = "tester"
PASSWD = "test123"
REALM = "TestRealm"
def setUp(self):
super(ProxyAuthTests, self).setUp()
self.digest_auth_handler = DigestAuthHandler()
self.digest_auth_handler.set_users({self.USER: self.PASSWD})
self.digest_auth_handler.set_realm(self.REALM)
def create_fake_proxy_handler(*args, **kwargs):
return FakeProxyHandler(self.digest_auth_handler, *args, **kwargs)
self.server = LoopbackHttpServerThread(create_fake_proxy_handler)
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 tearDown(self):
self.server.stop()
super(ProxyAuthTests, self).tearDown()
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")
result = self.opener.open(self.URL)
while result.read():
pass
result.close()
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.
result = None
if result:
while result.read():
pass
result.close()
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()
# Ignore proxies for localhost tests.
os.environ['NO_PROXY'] = '*'
self.server = None
def tearDown(self):
if self.server is not None:
self.server.stop()
super(TestUrlopen, self).tearDown()
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 start_server(self, responses=None):
if responses is None:
responses = [(200, [], b"we don't care")]
handler = GetRequestHandler(responses)
self.server = LoopbackHttpServerThread(handler)
self.server.start()
self.server.ready.wait()
port = self.server.port
handler.port = port
return handler
def start_https_server(self, responses=None, certfile=CERT_localhost):
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, certfile=certfile, handler_class=handler)
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()
data = self.urlopen("https://localhost:%s/bizarre" % handler.port)
self.assertEqual(data, b"we care a bit")
def test_https_with_cafile(self):
handler = self.start_https_server(certfile=CERT_localhost)
import ssl
# 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(ssl.CertificateError) 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 self.assertRaises(urllib.error.URLError) as cm:
self.urlopen("https://localhost:%s/bizarre" % handler.port,
cadefault=True)
def test_sending_headers(self):
handler = self.start_server()
req = urllib.request.Request("http://localhost:%s/" % handler.port,
headers={"Range": "bytes=20-39"})
urllib.request.urlopen(req)
self.assertEqual(handler.headers_received["Range"], "bytes=20-39")
def test_basic(self):
handler = self.start_server()
open_url = urllib.request.urlopen("http://localhost:%s" % handler.port)
for attr in ("read", "close", "info", "geturl"):
self.assertTrue(hasattr(open_url, attr), "object returned from "
"urlopen lacks the %s attribute" % attr)
try:
self.assertTrue(open_url.read(), "calling 'read' failed")
finally:
open_url.close()
def test_info(self):
handler = self.start_server()
try:
open_url = urllib.request.urlopen(
"http://localhost:%s" % handler.port)
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")
finally:
self.server.stop()
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)
url = open_url.geturl()
self.assertEqual(url, "http://localhost:%s" % handler.port)
def test_bad_address(self):
# Make sure proper exception is raised when connecting to a bogus
# address.
self.assertRaises(IOError,
# Given that both VeriSign and various ISPs have in
# the past or are presently hijacking various invalid
# domain name requests in an attempt to boost traffic
# to their own sites, finding a domain name to use
# for this test is difficult. RFC2606 leads one to
# believe that '.invalid' should work, but experience
# seemed to indicate otherwise. Single character
# TLDs are likely to remain invalid, so this seems to
# be the best choice. The trailing '.' prevents a
# related problem: The normal DNS resolver appends
# the domain names from the search path if there is
# no '.' the end and, and if one of those domains
# implements a '*' rule a result is returned.
# However, none of this will prevent the test from
# failing if the ISP hijacks all invalid domain
# requests. The real solution would be to be able to
# parameterize the framework with a mock resolver.
urllib.request.urlopen,
"http://sadflkjsasf.i.nvali.d./")
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))
@support.reap_threads
def test_main():
support.run_unittest(ProxyAuthTests, TestUrlopen)
if __name__ == "__main__":
test_main()
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