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import argparse
import json
import os
import random
import sys
from pathlib import Path
from shutil import rmtree
from subprocess import Popen, PIPE
from tempfile import mkdtemp
from urllib.parse import urlencode
from OpenSSL import SSL
from twisted.internet import defer, reactor, ssl
from twisted.internet.task import deferLater
from twisted.names import dns, error
from twisted.names.server import DNSServerFactory
from twisted.web.resource import EncodingResourceWrapper, Resource
from twisted.web.server import GzipEncoderFactory, NOT_DONE_YET, Site
from twisted.web.static import File
from twisted.web.test.test_webclient import PayloadResource
from twisted.web.util import redirectTo
from scrapy.utils.python import to_bytes, to_unicode
from scrapy.utils.ssl import SSL_OP_NO_TLSv1_3
from scrapy.utils.test import get_testenv
def getarg(request, name, default=None, type=None):
if name in request.args:
value = request.args[name][0]
if type is not None:
value = type(value)
return value
else:
return default
class LeafResource(Resource):
isLeaf = True
def deferRequest(self, request, delay, f, *a, **kw):
def _cancelrequest(_):
# silence CancelledError
d.addErrback(lambda _: None)
d.cancel()
d = deferLater(reactor, delay, f, *a, **kw)
request.notifyFinish().addErrback(_cancelrequest)
return d
class Follow(LeafResource):
def render(self, request):
total = getarg(request, b"total", 100, type=int)
show = getarg(request, b"show", 1, type=int)
order = getarg(request, b"order", b"desc")
maxlatency = getarg(request, b"maxlatency", 0, type=float)
n = getarg(request, b"n", total, type=int)
if order == b"rand":
nlist = [random.randint(1, total) for _ in range(show)]
else: # order == "desc"
nlist = range(n, max(n - show, 0), -1)
lag = random.random() * maxlatency
self.deferRequest(request, lag, self.renderRequest, request, nlist)
return NOT_DONE_YET
def renderRequest(self, request, nlist):
s = """<html> <head></head> <body>"""
args = request.args.copy()
for nl in nlist:
args[b"n"] = [to_bytes(str(nl))]
argstr = urlencode(args, doseq=True)
s += f"<a href='/follow?{argstr}'>follow {nl}</a><br>"
s += """</body>"""
request.write(to_bytes(s))
request.finish()
class Delay(LeafResource):
def render_GET(self, request):
n = getarg(request, b"n", 1, type=float)
b = getarg(request, b"b", 1, type=int)
if b:
# send headers now and delay body
request.write('')
self.deferRequest(request, n, self._delayedRender, request, n)
return NOT_DONE_YET
def _delayedRender(self, request, n):
request.write(to_bytes(f"Response delayed for {n:.3f} seconds\n"))
request.finish()
class Status(LeafResource):
def render_GET(self, request):
n = getarg(request, b"n", 200, type=int)
request.setResponseCode(n)
return b""
class Raw(LeafResource):
def render_GET(self, request):
request.startedWriting = 1
self.deferRequest(request, 0, self._delayedRender, request)
return NOT_DONE_YET
render_POST = render_GET
def _delayedRender(self, request):
raw = getarg(request, b'raw', b'HTTP 1.1 200 OK\n')
request.startedWriting = 1
request.write(raw)
request.channel.transport.loseConnection()
request.finish()
class Echo(LeafResource):
def render_GET(self, request):
output = {
'headers': dict(
(to_unicode(k), [to_unicode(v) for v in vs])
for k, vs in request.requestHeaders.getAllRawHeaders()),
'body': to_unicode(request.content.read()),
}
return to_bytes(json.dumps(output))
render_POST = render_GET
class RedirectTo(LeafResource):
def render(self, request):
goto = getarg(request, b'goto', b'/')
# we force the body content, otherwise Twisted redirectTo()
# returns HTML with <meta http-equiv="refresh"
redirectTo(goto, request)
return b'redirecting...'
class Partial(LeafResource):
def render_GET(self, request):
request.setHeader(b"Content-Length", b"1024")
self.deferRequest(request, 0, self._delayedRender, request)
return NOT_DONE_YET
def _delayedRender(self, request):
request.write(b"partial content\n")
request.finish()
class Drop(Partial):
def _delayedRender(self, request):
abort = getarg(request, b"abort", 0, type=int)
request.write(b"this connection will be dropped\n")
tr = request.channel.transport
try:
if abort and hasattr(tr, 'abortConnection'):
tr.abortConnection()
else:
tr.loseConnection()
finally:
request.finish()
class ArbitraryLengthPayloadResource(LeafResource):
def render(self, request):
return request.content.read()
class Root(Resource):
def __init__(self):
Resource.__init__(self)
self.putChild(b"status", Status())
self.putChild(b"follow", Follow())
self.putChild(b"delay", Delay())
self.putChild(b"partial", Partial())
self.putChild(b"drop", Drop())
self.putChild(b"raw", Raw())
self.putChild(b"echo", Echo())
self.putChild(b"payload", PayloadResource())
self.putChild(b"xpayload", EncodingResourceWrapper(PayloadResource(), [GzipEncoderFactory()]))
self.putChild(b"alpayload", ArbitraryLengthPayloadResource())
try:
from tests import tests_datadir
self.putChild(b"files", File(os.path.join(tests_datadir, 'test_site/files/')))
except Exception:
pass
self.putChild(b"redirect-to", RedirectTo())
def getChild(self, name, request):
return self
def render(self, request):
return b'Scrapy mock HTTP server\n'
class MockServer:
def __enter__(self):
self.proc = Popen([sys.executable, '-u', '-m', 'tests.mockserver', '-t', 'http'],
stdout=PIPE, env=get_testenv())
http_address = self.proc.stdout.readline().strip().decode('ascii')
https_address = self.proc.stdout.readline().strip().decode('ascii')
self.http_address = http_address
self.https_address = https_address
return self
def __exit__(self, exc_type, exc_value, traceback):
self.proc.kill()
self.proc.communicate()
def url(self, path, is_secure=False):
host = self.https_address if is_secure else self.http_address
host = host.replace('0.0.0.0', '127.0.0.1')
return host + path
class MockDNSResolver:
"""
Implements twisted.internet.interfaces.IResolver partially
"""
def _resolve(self, name):
record = dns.Record_A(address=b"127.0.0.1")
answer = dns.RRHeader(name=name, payload=record)
return [answer], [], []
def query(self, query, timeout=None):
if query.type == dns.A:
return defer.succeed(self._resolve(query.name.name))
return defer.fail(error.DomainError())
def lookupAllRecords(self, name, timeout=None):
return defer.succeed(self._resolve(name))
class MockDNSServer:
def __enter__(self):
self.proc = Popen([sys.executable, '-u', '-m', 'tests.mockserver', '-t', 'dns'],
stdout=PIPE, env=get_testenv())
self.host = '127.0.0.1'
self.port = int(self.proc.stdout.readline().strip().decode('ascii').split(":")[1])
return self
def __exit__(self, exc_type, exc_value, traceback):
self.proc.kill()
self.proc.communicate()
class MockFTPServer:
"""Creates an FTP server on port 2121 with a default passwordless user
(anonymous) and a temporary root path that you can read from the
:attr:`path` attribute."""
def __enter__(self):
self.path = Path(mkdtemp())
self.proc = Popen([sys.executable, '-u', '-m', 'tests.ftpserver', '-d', str(self.path)],
stderr=PIPE, env=get_testenv())
for line in self.proc.stderr:
if b'starting FTP server' in line:
break
return self
def __exit__(self, exc_type, exc_value, traceback):
rmtree(str(self.path))
self.proc.kill()
self.proc.communicate()
def url(self, path):
return 'ftp://127.0.0.1:2121/' + path
def ssl_context_factory(keyfile='keys/localhost.key', certfile='keys/localhost.crt', cipher_string=None):
factory = ssl.DefaultOpenSSLContextFactory(
os.path.join(os.path.dirname(__file__), keyfile),
os.path.join(os.path.dirname(__file__), certfile),
)
if cipher_string:
ctx = factory.getContext()
# disabling TLS1.3 because it unconditionally enables some strong ciphers
ctx.set_options(SSL.OP_CIPHER_SERVER_PREFERENCE | SSL_OP_NO_TLSv1_3)
ctx.set_cipher_list(to_bytes(cipher_string))
return factory
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("-t", "--type", type=str, choices=("http", "dns"), default="http")
args = parser.parse_args()
if args.type == "http":
root = Root()
factory = Site(root)
httpPort = reactor.listenTCP(0, factory)
contextFactory = ssl_context_factory()
httpsPort = reactor.listenSSL(0, factory, contextFactory)
def print_listening():
httpHost = httpPort.getHost()
httpsHost = httpsPort.getHost()
httpAddress = f'http://{httpHost.host}:{httpHost.port}'
httpsAddress = f'https://{httpsHost.host}:{httpsHost.port}'
print(httpAddress)
print(httpsAddress)
elif args.type == "dns":
clients = [MockDNSResolver()]
factory = DNSServerFactory(clients=clients)
protocol = dns.DNSDatagramProtocol(controller=factory)
listener = reactor.listenUDP(0, protocol)
def print_listening():
host = listener.getHost()
print(f"{host.host}:{host.port}")
reactor.callWhenRunning(print_listening)
reactor.run()
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