Mini Shell
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Helpers related to HTTP requests, used by tests.
"""
__all__ = ["DummyChannel", "DummyRequest"]
from io import BytesIO
from typing import Optional
from zope.interface import implementer, verify
from incremental import Version
from twisted.internet.address import IPv4Address, IPv6Address
from twisted.internet.defer import Deferred
from twisted.internet.interfaces import IAddress, ISSLTransport
from twisted.internet.task import Clock
from twisted.python.deprecate import deprecated
from twisted.trial import unittest
from twisted.web._responses import FOUND
from twisted.web.http_headers import Headers
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET, Session, Site
textLinearWhitespaceComponents = [f"Foo{lw}bar" for lw in ["\r", "\n", "\r\n"]]
sanitizedText = "Foo bar"
bytesLinearWhitespaceComponents = [
component.encode("ascii") for component in textLinearWhitespaceComponents
]
sanitizedBytes = sanitizedText.encode("ascii")
@implementer(IAddress)
class NullAddress:
"""
A null implementation of L{IAddress}.
"""
class DummyChannel:
class TCP:
port = 80
disconnected = False
def __init__(self, peer=None):
if peer is None:
peer = IPv4Address("TCP", "192.168.1.1", 12344)
self._peer = peer
self.written = BytesIO()
self.producers = []
def getPeer(self):
return self._peer
def write(self, data):
if not isinstance(data, bytes):
raise TypeError(f"Can only write bytes to a transport, not {data!r}")
self.written.write(data)
def writeSequence(self, iovec):
for data in iovec:
self.write(data)
def getHost(self):
return IPv4Address("TCP", "10.0.0.1", self.port)
def registerProducer(self, producer, streaming):
self.producers.append((producer, streaming))
def unregisterProducer(self):
pass
def loseConnection(self):
self.disconnected = True
@implementer(ISSLTransport)
class SSL(TCP):
def abortConnection(self):
# ITCPTransport.abortConnection
pass
def getTcpKeepAlive(self):
# ITCPTransport.getTcpKeepAlive
pass
def getTcpNoDelay(self):
# ITCPTransport.getTcpNoDelay
pass
def loseWriteConnection(self):
# ITCPTransport.loseWriteConnection
pass
def setTcpKeepAlive(self, enabled):
# ITCPTransport.setTcpKeepAlive
pass
def setTcpNoDelay(self, enabled):
# ITCPTransport.setTcpNoDelay
pass
def getPeerCertificate(self):
# ISSLTransport.getPeerCertificate
pass
site = Site(Resource())
def __init__(self, peer=None):
self.transport = self.TCP(peer)
def requestDone(self, request):
pass
def writeHeaders(self, version, code, reason, headers):
response_line = version + b" " + code + b" " + reason + b"\r\n"
headerSequence = [response_line]
headerSequence.extend(name + b": " + value + b"\r\n" for name, value in headers)
headerSequence.append(b"\r\n")
self.transport.writeSequence(headerSequence)
def getPeer(self):
return self.transport.getPeer()
def getHost(self):
return self.transport.getHost()
def registerProducer(self, producer, streaming):
self.transport.registerProducer(producer, streaming)
def unregisterProducer(self):
self.transport.unregisterProducer()
def write(self, data):
self.transport.write(data)
def writeSequence(self, iovec):
self.transport.writeSequence(iovec)
def loseConnection(self):
self.transport.loseConnection()
def endRequest(self):
pass
def isSecure(self):
return isinstance(self.transport, self.SSL)
def abortConnection(self):
# ITCPTransport.abortConnection
pass
def getTcpKeepAlive(self):
# ITCPTransport.getTcpKeepAlive
pass
def getTcpNoDelay(self):
# ITCPTransport.getTcpNoDelay
pass
def loseWriteConnection(self):
# ITCPTransport.loseWriteConnection
pass
def setTcpKeepAlive(self):
# ITCPTransport.setTcpKeepAlive
pass
def setTcpNoDelay(self):
# ITCPTransport.setTcpNoDelay
pass
def getPeerCertificate(self):
# ISSLTransport.getPeerCertificate
pass
class DummyRequest:
"""
Represents a dummy or fake request. See L{twisted.web.server.Request}.
@ivar _finishedDeferreds: L{None} or a C{list} of L{Deferreds} which will
be called back with L{None} when C{finish} is called or which will be
errbacked if C{processingFailed} is called.
@type requestheaders: C{Headers}
@ivar requestheaders: A Headers instance that stores values for all request
headers.
@type responseHeaders: C{Headers}
@ivar responseHeaders: A Headers instance that stores values for all
response headers.
@type responseCode: C{int}
@ivar responseCode: The response code which was passed to
C{setResponseCode}.
@type written: C{list} of C{bytes}
@ivar written: The bytes which have been written to the request.
"""
uri = b"http://dummy/"
method = b"GET"
client: Optional[IAddress] = None
def registerProducer(self, prod, s):
"""
Call an L{IPullProducer}'s C{resumeProducing} method in a
loop until it unregisters itself.
@param prod: The producer.
@type prod: L{IPullProducer}
@param s: Whether or not the producer is streaming.
"""
# XXX: Handle IPushProducers
self.go = 1
while self.go:
prod.resumeProducing()
def unregisterProducer(self):
self.go = 0
def __init__(self, postpath, session=None, client=None):
self.sitepath = []
self.written = []
self.finished = 0
self.postpath = postpath
self.prepath = []
self.session = None
self.protoSession = session or Session(site=None, uid=b"0", reactor=Clock())
self.args = {}
self.requestHeaders = Headers()
self.responseHeaders = Headers()
self.responseCode = None
self._finishedDeferreds = []
self._serverName = b"dummy"
self.clientproto = b"HTTP/1.0"
def getAllHeaders(self):
"""
Return dictionary mapping the names of all received headers to the last
value received for each.
Since this method does not return all header information,
C{self.requestHeaders.getAllRawHeaders()} may be preferred.
NOTE: This function is a direct copy of
C{twisted.web.http.Request.getAllRawHeaders}.
"""
headers = {}
for k, v in self.requestHeaders.getAllRawHeaders():
headers[k.lower()] = v[-1]
return headers
def getHeader(self, name):
"""
Retrieve the value of a request header.
@type name: C{bytes}
@param name: The name of the request header for which to retrieve the
value. Header names are compared case-insensitively.
@rtype: C{bytes} or L{None}
@return: The value of the specified request header.
"""
return self.requestHeaders.getRawHeaders(name.lower(), [None])[0]
def setHeader(self, name, value):
"""TODO: make this assert on write() if the header is content-length"""
self.responseHeaders.addRawHeader(name, value)
def getSession(self, sessionInterface=None):
if self.session:
return self.session
assert (
not self.written
), "Session cannot be requested after data has been written."
self.session = self.protoSession
return self.session
def render(self, resource):
"""
Render the given resource as a response to this request.
This implementation only handles a few of the most common behaviors of
resources. It can handle a render method that returns a string or
C{NOT_DONE_YET}. It doesn't know anything about the semantics of
request methods (eg HEAD) nor how to set any particular headers.
Basically, it's largely broken, but sufficient for some tests at least.
It should B{not} be expanded to do all the same stuff L{Request} does.
Instead, L{DummyRequest} should be phased out and L{Request} (or some
other real code factored in a different way) used.
"""
result = resource.render(self)
if result is NOT_DONE_YET:
return
self.write(result)
self.finish()
def write(self, data):
if not isinstance(data, bytes):
raise TypeError("write() only accepts bytes")
self.written.append(data)
def notifyFinish(self) -> Deferred[None]:
"""
Return a L{Deferred} which is called back with L{None} when the request
is finished. This will probably only work if you haven't called
C{finish} yet.
"""
finished: Deferred[None] = Deferred()
self._finishedDeferreds.append(finished)
return finished
def finish(self):
"""
Record that the request is finished and callback and L{Deferred}s
waiting for notification of this.
"""
self.finished = self.finished + 1
if self._finishedDeferreds is not None:
observers = self._finishedDeferreds
self._finishedDeferreds = None
for obs in observers:
obs.callback(None)
def processingFailed(self, reason):
"""
Errback and L{Deferreds} waiting for finish notification.
"""
if self._finishedDeferreds is not None:
observers = self._finishedDeferreds
self._finishedDeferreds = None
for obs in observers:
obs.errback(reason)
def addArg(self, name, value):
self.args[name] = [value]
def setResponseCode(self, code, message=None):
"""
Set the HTTP status response code, but takes care that this is called
before any data is written.
"""
assert (
not self.written
), "Response code cannot be set after data has" "been written: {}.".format(
"@@@@".join(self.written)
)
self.responseCode = code
self.responseMessage = message
def setLastModified(self, when):
assert (
not self.written
), "Last-Modified cannot be set after data has " "been written: {}.".format(
"@@@@".join(self.written)
)
def setETag(self, tag):
assert (
not self.written
), "ETag cannot be set after data has been " "written: {}.".format(
"@@@@".join(self.written)
)
@deprecated(Version("Twisted", 18, 4, 0), replacement="getClientAddress")
def getClientIP(self):
"""
Return the IPv4 address of the client which made this request, if there
is one, otherwise L{None}.
"""
if isinstance(self.client, (IPv4Address, IPv6Address)):
return self.client.host
return None
def getClientAddress(self):
"""
Return the L{IAddress} of the client that made this request.
@return: an address.
@rtype: an L{IAddress} provider.
"""
if self.client is None:
return NullAddress()
return self.client
def getRequestHostname(self):
"""
Get a dummy hostname associated to the HTTP request.
@rtype: C{bytes}
@returns: a dummy hostname
"""
return self._serverName
def getHost(self):
"""
Get a dummy transport's host.
@rtype: C{IPv4Address}
@returns: a dummy transport's host
"""
return IPv4Address("TCP", "127.0.0.1", 80)
def setHost(self, host, port, ssl=0):
"""
Change the host and port the request thinks it's using.
@type host: C{bytes}
@param host: The value to which to change the host header.
@type ssl: C{bool}
@param ssl: A flag which, if C{True}, indicates that the request is
considered secure (if C{True}, L{isSecure} will return C{True}).
"""
self._forceSSL = ssl # set first so isSecure will work
if self.isSecure():
default = 443
else:
default = 80
if port == default:
hostHeader = host
else:
hostHeader = b"%b:%d" % (host, port)
self.requestHeaders.addRawHeader(b"host", hostHeader)
def redirect(self, url):
"""
Utility function that does a redirect.
The request should have finish() called after this.
"""
self.setResponseCode(FOUND)
self.setHeader(b"location", url)
class DummyRequestTests(unittest.SynchronousTestCase):
"""
Tests for L{DummyRequest}.
"""
def test_getClientIPDeprecated(self):
"""
L{DummyRequest.getClientIP} is deprecated in favor of
L{DummyRequest.getClientAddress}
"""
request = DummyRequest([])
request.getClientIP()
warnings = self.flushWarnings(
offendingFunctions=[self.test_getClientIPDeprecated]
)
self.assertEqual(1, len(warnings))
[warning] = warnings
self.assertEqual(warning.get("category"), DeprecationWarning)
self.assertEqual(
warning.get("message"),
(
"twisted.web.test.requesthelper.DummyRequest.getClientIP "
"was deprecated in Twisted 18.4.0; "
"please use getClientAddress instead"
),
)
def test_getClientIPSupportsIPv6(self):
"""
L{DummyRequest.getClientIP} supports IPv6 addresses, just like
L{twisted.web.http.Request.getClientIP}.
"""
request = DummyRequest([])
client = IPv6Address("TCP", "::1", 12345)
request.client = client
self.assertEqual("::1", request.getClientIP())
def test_getClientAddressWithoutClient(self):
"""
L{DummyRequest.getClientAddress} returns an L{IAddress}
provider no C{client} has been set.
"""
request = DummyRequest([])
null = request.getClientAddress()
verify.verifyObject(IAddress, null)
def test_getClientAddress(self):
"""
L{DummyRequest.getClientAddress} returns the C{client}.
"""
request = DummyRequest([])
client = IPv4Address("TCP", "127.0.0.1", 12345)
request.client = client
address = request.getClientAddress()
self.assertIs(address, client)
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