import os
import socket
import time
from unittest import mock

import pytest

import mitmproxy.net.http
from mitmproxy import certs
from mitmproxy import exceptions
from mitmproxy import http
from mitmproxy import options
from mitmproxy.addons import proxyauth
from mitmproxy.addons import script
from mitmproxy.net import socks
from mitmproxy.net import tcp
from mitmproxy.net.http import http1
from mitmproxy.proxy.config import HostMatcher
from mitmproxy.test import tutils
from pathod import pathoc
from pathod import pathod
from .. import tservers
from ...conftest import skip_appveyor

"""
    Note that the choice of response code in these tests matters more than you
    might think. libcurl treats a 304 response code differently from, say, a
    200 response code - it will correctly terminate a 304 response with no
    content-length header, whereas it will block forever waiting for content
    for a 200 response.
"""


class CommonMixin:

    def test_large(self):
        assert len(self.pathod("200:b@50k").content) == 1024 * 50

    @staticmethod
    def wait_until_not_live(flow):
        """
        Race condition: We don't want to replay the flow while it is still live.
        """
        s = time.time()
        while flow.live:
            time.sleep(0.001)
            if time.time() - s > 5:
                raise RuntimeError("Flow is live for too long.")

    def test_replay(self):
        assert self.pathod("304").status_code == 304
        assert len(self.master.state.flows) == 1
        l = self.master.state.flows[-1]
        assert l.response.status_code == 304
        l.request.path = "/p/305"
        self.wait_until_not_live(l)
        rt = self.master.replay_request(l, block=True)
        assert l.response.status_code == 305

        # Disconnect error
        l.request.path = "/p/305:d0"
        rt = self.master.replay_request(l, block=True)
        assert rt
        if isinstance(self, tservers.HTTPUpstreamProxyTest):
            assert l.response.status_code == 502
        else:
            assert l.error

        # Port error
        l.request.port = 1
        # In upstream mode, we get a 502 response from the upstream proxy server.
        # In upstream mode with ssl, the replay will fail as we cannot establish
        # SSL with the upstream proxy.
        rt = self.master.replay_request(l, block=True)
        assert rt
        if isinstance(self, tservers.HTTPUpstreamProxyTest):
            assert l.response.status_code == 502
        else:
            assert l.error

    def test_http(self):
        f = self.pathod("304")
        assert f.status_code == 304

        # In Upstream mode with SSL, we may already have a previous CONNECT
        # request.
        l = self.master.state.flows[-1]
        assert l.client_conn.address
        assert "host" in l.request.headers
        assert l.response.status_code == 304

    def test_invalid_http(self):
        t = tcp.TCPClient(("127.0.0.1", self.proxy.port))
        with t.connect():
            t.wfile.write(b"invalid\r\n\r\n")
            t.wfile.flush()
            line = t.rfile.readline()
            assert (b"Bad Request" in line) or (b"Bad Gateway" in line)

    def test_sni(self):
        if not self.ssl:
            return

        if getattr(self, 'reverse', False):
            # In reverse proxy mode, we expect to use the upstream host as our SNI value
            expected_sni = "127.0.0.1"
        else:
            expected_sni = "testserver.com"

        f = self.pathod("304", sni="testserver.com")
        assert f.status_code == 304
        log = self.server.last_log()
        assert log["request"]["sni"] == expected_sni


class TcpMixin:

    def _ignore_on(self):
        assert not hasattr(self, "_ignore_backup")
        self._ignore_backup = self.options.ignore_hosts
        self.options.ignore_hosts = [".+:%s" % self.server.port] + self.options.ignore_hosts

    def _ignore_off(self):
        assert hasattr(self, "_ignore_backup")
        self.options.ignore_hosts = self._ignore_backup
        del self._ignore_backup

    def test_ignore(self):
        n = self.pathod("304")
        self._ignore_on()
        i = self.pathod("305")
        i2 = self.pathod("306")
        self._ignore_off()

        self.master.event_queue.join()

        assert n.status_code == 304
        assert i.status_code == 305
        assert i2.status_code == 306
        assert any(f.response.status_code == 304 for f in self.master.state.flows)
        assert not any(f.response.status_code == 305 for f in self.master.state.flows)
        assert not any(f.response.status_code == 306 for f in self.master.state.flows)

        # Test that we get the original SSL cert
        if self.ssl:
            i_cert = certs.Cert(i.sslinfo.certchain[0])
            i2_cert = certs.Cert(i2.sslinfo.certchain[0])
            n_cert = certs.Cert(n.sslinfo.certchain[0])

            assert i_cert == i2_cert
            assert i_cert != n_cert

        # Test Non-HTTP traffic
        spec = "200:i0,@100:d0"  # this results in just 100 random bytes
        # mitmproxy responds with bad gateway
        assert self.pathod(spec).status_code == 502
        self._ignore_on()
        with pytest.raises(exceptions.HttpException):
            self.pathod(spec)  # pathoc tries to parse answer as HTTP

        self._ignore_off()

    def _tcpproxy_on(self):
        assert not hasattr(self, "_tcpproxy_backup")
        self._tcpproxy_backup = self.options.tcp_hosts
        self.options.tcp_hosts = [".+:%s" % self.server.port] + self.options.tcp_hosts

    def _tcpproxy_off(self):
        assert hasattr(self, "_tcpproxy_backup")
        self.options.tcp_hosts = self._tcpproxy_backup
        del self._tcpproxy_backup

    def test_tcp(self):
        n = self.pathod("304")
        self._tcpproxy_on()
        i = self.pathod("305")
        i2 = self.pathod("306")
        self._tcpproxy_off()

        self.master.event_queue.join()

        assert n.status_code == 304
        assert i.status_code == 305
        assert i2.status_code == 306
        assert any(f.response.status_code == 304 for f in self.master.state.flows if isinstance(f, http.HTTPFlow))
        assert not any(f.response.status_code == 305 for f in self.master.state.flows if isinstance(f, http.HTTPFlow))
        assert not any(f.response.status_code == 306 for f in self.master.state.flows if isinstance(f, http.HTTPFlow))

        # Test that we get the original SSL cert
        if self.ssl:
            i_cert = certs.Cert(i.sslinfo.certchain[0])
            i2_cert = certs.Cert(i2.sslinfo.certchain[0])
            n_cert = certs.Cert(n.sslinfo.certchain[0])

            assert i_cert == i2_cert
            assert i_cert != n_cert

        # Make sure that TCP messages are in the event log.
        # Re-enable and fix this when we start keeping TCPFlows in the state.
        # assert any("305" in m for m in self.master.tlog)
        # assert any("306" in m for m in self.master.tlog)


class TestHTTP(tservers.HTTPProxyTest, CommonMixin):
    def test_invalid_connect(self):
        t = tcp.TCPClient(("127.0.0.1", self.proxy.port))
        with t.connect():
            t.wfile.write(b"CONNECT invalid\n\n")
            t.wfile.flush()
            assert b"Bad Request" in t.rfile.readline()

    def test_upstream_ssl_error(self):
        p = self.pathoc()
        with p.connect():
            ret = p.request("get:'https://localhost:%s/'" % self.server.port)
        assert ret.status_code == 400

    def test_connection_close(self):
        # Add a body, so we have a content-length header, which combined with
        # HTTP1.1 means the connection is kept alive.
        response = '%s/p/200:b@1' % self.server.urlbase

        # Lets sanity check that the connection does indeed stay open by
        # issuing two requests over the same connection
        p = self.pathoc()
        with p.connect():
            assert p.request("get:'%s'" % response)
            assert p.request("get:'%s'" % response)

        # Now check that the connection is closed as the client specifies
        p = self.pathoc()
        with p.connect():
            assert p.request("get:'%s':h'Connection'='close'" % response)
            # There's a race here, which means we can get any of a number of errors.
            # Rather than introduce yet another sleep into the test suite, we just
            # relax the Exception specification.
            with pytest.raises(Exception):
                p.request("get:'%s'" % response)

    def test_reconnect(self):
        req = "get:'%s/p/200:b@1'" % self.server.urlbase
        p = self.pathoc()

        class MockOnce:
            call = 0

            def mock_once(self, http1obj, req):
                self.call += 1
                if self.call == 1:
                    raise exceptions.TcpDisconnect
                else:
                    headers = http1.assemble_request_head(req)
                    http1obj.server_conn.wfile.write(headers)
                    http1obj.server_conn.wfile.flush()

        with p.connect():
            with mock.patch("mitmproxy.proxy.protocol.http1.Http1Layer.send_request_headers",
                            side_effect=MockOnce().mock_once, autospec=True):
                # Server disconnects while sending headers but mitmproxy reconnects
                resp = p.request(req)
                assert resp
                assert resp.status_code == 200

    def test_get_connection_switching(self):
        req = "get:'%s/p/200:b@1'"
        p = self.pathoc()
        with p.connect():
            assert p.request(req % self.server.urlbase)
            assert p.request(req % self.server2.urlbase)
        assert self.proxy.tmaster.has_log("serverdisconnect")

    def test_blank_leading_line(self):
        p = self.pathoc()
        with p.connect():
            req = "get:'%s/p/201':i0,'\r\n'"
            assert p.request(req % self.server.urlbase).status_code == 201

    def test_invalid_headers(self):
        p = self.pathoc()
        with p.connect():
            resp = p.request("get:'http://foo':h':foo'='bar'")
        assert resp.status_code == 400

    def test_stream_modify(self):
        s = script.Script(
            tutils.test_data.path("mitmproxy/data/addonscripts/stream_modify.py")
        )
        self.master.addons.add(s)
        d = self.pathod('200:b"foo"')
        assert d.content == b"bar"
        self.master.addons.remove(s)

    def test_first_line_rewrite(self):
        """
        If mitmproxy is a regular HTTP proxy, it must rewrite an absolute-form request like
            GET http://example.com/foo HTTP/1.0
        to
            GET /foo HTTP/1.0
        when sending the request upstream. While any server should technically accept
        the absolute form, this is not the case in practice.
        """
        req = "get:'%s/p/200'" % self.server.urlbase
        p = self.pathoc()
        with p.connect():
            assert p.request(req).status_code == 200
            assert self.server.last_log()["request"]["first_line_format"] == "relative"


class TestHTTPAuth(tservers.HTTPProxyTest):
    def test_auth(self):
        self.master.addons.add(proxyauth.ProxyAuth())
        self.master.addons.trigger(
            "configure", self.master.options.keys()
        )
        self.master.options.proxyauth = "test:test"
        assert self.pathod("202").status_code == 407
        p = self.pathoc()
        with p.connect():
            ret = p.request("""
                get
                'http://localhost:%s/p/202'
                h'%s'='%s'
            """ % (
                self.server.port,
                "Proxy-Authorization",
                proxyauth.mkauth("test", "test")
            ))
        assert ret.status_code == 202


class TestHTTPReverseAuth(tservers.ReverseProxyTest):
    def test_auth(self):
        self.master.addons.add(proxyauth.ProxyAuth())
        self.master.options.proxyauth = "test:test"
        assert self.pathod("202").status_code == 401
        p = self.pathoc()
        with p.connect():
            ret = p.request("""
                get
                '/p/202'
                h'%s'='%s'
            """ % (
                "Authorization",
                proxyauth.mkauth("test", "test")
            ))
        assert ret.status_code == 202


class TestHTTPS(tservers.HTTPProxyTest, CommonMixin, TcpMixin):
    ssl = True
    ssloptions = pathod.SSLOptions(request_client_cert=True)

    def test_clientcert_file(self):
        try:
            self.options.client_certs = os.path.join(
                tutils.test_data.path("mitmproxy/data/clientcert"), "client.pem")
            f = self.pathod("304")
            assert f.status_code == 304
            assert self.server.last_log()["request"]["clientcert"]["keyinfo"]
        finally:
            self.options.client_certs = None

    def test_clientcert_dir(self):
        try:
            self.options.client_certs = tutils.test_data.path("mitmproxy/data/clientcert")
            f = self.pathod("304")
            assert f.status_code == 304
            assert self.server.last_log()["request"]["clientcert"]["keyinfo"]
        finally:
            self.options.client_certs = None

    def test_error_post_connect(self):
        p = self.pathoc()
        with p.connect():
            assert p.request("get:/:i0,'invalid\r\n\r\n'").status_code == 400


class TestHTTPSCertfile(tservers.HTTPProxyTest, CommonMixin):
    ssl = True
    certfile = True

    def test_certfile(self):
        assert self.pathod("304")


class TestHTTPSSecureByDefault:
    def test_secure_by_default(self):
        """
        Certificate verification should be turned on by default.
        """
        default_opts = options.Options()
        assert not default_opts.ssl_insecure


class TestHTTPSUpstreamServerVerificationWTrustedCert(tservers.HTTPProxyTest):

    """
    Test upstream server certificate verification with a trusted server cert.
    """
    ssl = True
    ssloptions = pathod.SSLOptions(
        cn=b"example.mitmproxy.org",
        certs=[
            ("example.mitmproxy.org", tutils.test_data.path("mitmproxy/data/servercert/trusted-leaf.pem"))
        ]
    )

    def _request(self):
        p = self.pathoc(sni="example.mitmproxy.org")
        with p.connect():
            return p.request("get:/p/242")

    def test_verification_w_cadir(self):
        self.options.update(
            ssl_insecure=False,
            ssl_verify_upstream_trusted_cadir=tutils.test_data.path(
                "mitmproxy/data/servercert/"
            ),
            ssl_verify_upstream_trusted_ca=None,
        )
        assert self._request().status_code == 242

    def test_verification_w_pemfile(self):
        self.options.update(
            ssl_insecure=False,
            ssl_verify_upstream_trusted_cadir=None,
            ssl_verify_upstream_trusted_ca=tutils.test_data.path(
                "mitmproxy/data/servercert/trusted-root.pem"
            ),
        )
        assert self._request().status_code == 242


class TestHTTPSUpstreamServerVerificationWBadCert(tservers.HTTPProxyTest):

    """
    Test upstream server certificate verification with an untrusted server cert.
    """
    ssl = True
    ssloptions = pathod.SSLOptions(
        cn=b"example.mitmproxy.org",
        certs=[
            ("example.mitmproxy.org", tutils.test_data.path("mitmproxy/data/servercert/self-signed.pem"))
        ])

    def _request(self):
        p = self.pathoc(sni="example.mitmproxy.org")
        with p.connect():
            return p.request("get:/p/242")

    @classmethod
    def get_options(cls):
        opts = super().get_options()
        opts.ssl_verify_upstream_trusted_ca = tutils.test_data.path(
            "mitmproxy/data/servercert/trusted-root.pem"
        )
        return opts

    def test_no_verification_w_bad_cert(self):
        self.options.ssl_insecure = True
        r = self._request()
        assert r.status_code == 242

    def test_verification_w_bad_cert(self):
        # We only test for a single invalid cert here.
        # Actual testing of different root-causes (invalid hostname, expired, ...)
        # is done in mitmproxy.net.
        self.options.ssl_insecure = False
        r = self._request()
        assert r.status_code == 502
        assert b"Certificate verification error" in r.raw_content


class TestHTTPSNoCommonName(tservers.HTTPProxyTest):

    """
    Test what happens if we get a cert without common name back.
    """
    ssl = True
    ssloptions = pathod.SSLOptions(
        certs=[
            ("*", tutils.test_data.path("mitmproxy/data/no_common_name.pem"))
        ]
    )

    def test_http(self):
        f = self.pathod("202")
        assert f.sslinfo.certchain[0].get_subject().CN == "127.0.0.1"


class TestReverse(tservers.ReverseProxyTest, CommonMixin, TcpMixin):
    reverse = True

    def test_host_header(self):
        self.options.keep_host_header = True
        p = self.pathoc()
        with p.connect():
            resp = p.request("get:/p/200:h'Host'='example.com'")
        assert resp.status_code == 200

        req = self.master.state.flows[0].request
        assert req.host_header == "example.com"

    def test_overridden_host_header(self):
        self.options.keep_host_header = False  # default value
        p = self.pathoc()
        with p.connect():
            resp = p.request("get:/p/200:h'Host'='example.com'")
        assert resp.status_code == 200

        req = self.master.state.flows[0].request
        assert req.host_header == "127.0.0.1"

    def test_selfconnection(self):
        self.options.mode = "reverse:http://127.0.0.1:0"

        p = self.pathoc()
        with p.connect():
            p.request("get:/")
        assert self.master.has_log("The proxy shall not connect to itself.")


class TestReverseSSL(tservers.ReverseProxyTest, CommonMixin, TcpMixin):
    reverse = True
    ssl = True


class TestSocks5(tservers.SocksModeTest):

    def test_simple(self):
        p = self.pathoc()
        with p.connect():
            p.socks_connect(("localhost", self.server.port))
            f = p.request("get:/p/200")
        assert f.status_code == 200

    def test_with_authentication_only(self):
        p = self.pathoc()
        with p.connect():
            f = p.request("get:/p/200")
        assert f.status_code == 502
        assert b"SOCKS5 mode failure" in f.content
        assert b"Invalid SOCKS version. Expected 0x05, got 0x47" in f.content

    def test_no_connect(self):
        """
        mitmproxy doesn't support UDP or BIND SOCKS CMDs
        """
        p = self.pathoc()
        with p.connect():
            socks.ClientGreeting(
                socks.VERSION.SOCKS5,
                [socks.METHOD.NO_AUTHENTICATION_REQUIRED]
            ).to_file(p.wfile)
            socks.Message(
                socks.VERSION.SOCKS5,
                socks.CMD.BIND,
                socks.ATYP.DOMAINNAME,
                ("example.com", 8080)
            ).to_file(p.wfile)

            p.wfile.flush()
            p.rfile.read(2)  # read server greeting
            f = p.request("get:/p/200")  # the request doesn't matter, error response from handshake will be read anyway.
        assert f.status_code == 502
        assert b"SOCKS5 mode failure" in f.content
        assert b"mitmproxy only supports SOCKS5 CONNECT" in f.content

    def test_with_authentication(self):
        p = self.pathoc()
        with p.connect():
            socks.ClientGreeting(
                socks.VERSION.SOCKS5,
                [socks.METHOD.USERNAME_PASSWORD]
            ).to_file(p.wfile)
            p.wfile.flush()
            f = p.request("get:/p/200")  # the request doesn't matter, error response from handshake will be read anyway.
        assert f.status_code == 502
        assert b"SOCKS5 mode failure" in f.content
        assert b"mitmproxy only supports SOCKS without authentication" in f.content


class TestSocks5SSL(tservers.SocksModeTest):
    ssl = True

    def test_simple(self):
        p = self.pathoc_raw()
        with p.connect():
            p.socks_connect(("localhost", self.server.port))
            p.convert_to_tls()
            f = p.request("get:/p/200")
        assert f.status_code == 200


class TestHttps2Http(tservers.ReverseProxyTest):

    @classmethod
    def get_options(cls):
        opts = super().get_options()
        return opts

    def pathoc(self, ssl, sni=None):
        """
            Returns a connected Pathoc instance.
        """
        p = pathoc.Pathoc(
            ("localhost", self.proxy.port), ssl=True, sni=sni, fp=None
        )
        return p

    def test_all(self):
        p = self.pathoc(ssl=True)
        with p.connect():
            assert p.request("get:'/p/200'").status_code == 200

    def test_sni(self):
        p = self.pathoc(ssl=True, sni="example.com")
        with p.connect():
            assert p.request("get:'/p/200'").status_code == 200
            assert not self.proxy.tmaster.has_log("error in handle_sni")

    def test_http(self):
        p = self.pathoc(ssl=False)
        with p.connect():
            assert p.request("get:'/p/200'").status_code == 200


class TestTransparent(tservers.TransparentProxyTest, CommonMixin, TcpMixin):
    ssl = False

    def test_tcp_stream_modify(self):
        s = script.Script(
            tutils.test_data.path("mitmproxy/data/addonscripts/tcp_stream_modify.py")
        )
        self.master.addons.add(s)
        self._tcpproxy_on()
        d = self.pathod('200:b"foo"')
        self._tcpproxy_off()
        assert d.content == b"bar"
        self.master.addons.remove(s)


class TestTransparentSSL(tservers.TransparentProxyTest, CommonMixin, TcpMixin):
    ssl = True

    def test_sslerr(self):
        p = pathoc.Pathoc(("localhost", self.proxy.port), fp=None)
        p.connect()
        r = p.request("get:/")
        assert r.status_code == 502


class TestProxy(tservers.HTTPProxyTest):

    def test_http(self):
        f = self.pathod("304")
        assert f.status_code == 304

        f = self.master.state.flows[0]
        assert f.client_conn.address
        assert "host" in f.request.headers
        assert f.response.status_code == 304

    @skip_appveyor
    def test_response_timestamps(self):
        # test that we notice at least 1 sec delay between timestamps
        # in response object
        f = self.pathod("304:b@1k:p50,1")
        assert f.status_code == 304

        response = self.master.state.flows[0].response
        # timestamp_start might fire a bit late, so we play safe and only require 300ms.
        assert 0.3 <= response.timestamp_end - response.timestamp_start

    @skip_appveyor
    def test_request_timestamps(self):
        # test that we notice a delay between timestamps in request object
        connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connection.connect(("127.0.0.1", self.proxy.port))

        # call pathod server, wait a second to complete the request
        connection.send(
            b"GET http://localhost:%d/p/304:b@1k HTTP/1.1\r\n" %
            self.server.port)
        time.sleep(1)
        connection.send(b"\r\n")
        connection.recv(50000)
        connection.close()

        request, response = self.master.state.flows[
            0].request, self.master.state.flows[0].response
        assert response.status_code == 304  # sanity test for our low level request
        # timestamp_start might fire a bit late, so we play safe and only require 300ms.
        assert 0.3 <= request.timestamp_end - request.timestamp_start

    def test_request_tcp_setup_timestamp_presence(self):
        # tests that the client_conn a tcp connection has a tcp_setup_timestamp
        connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connection.connect(("localhost", self.proxy.port))
        connection.send(
            b"GET http://localhost:%d/p/200:b@1k HTTP/1.1\r\n" %
            self.server.port)
        connection.send(b"\r\n")
        # a bit hacky: make sure that we don't just read the headers only.
        recvd = 0
        while recvd < 1024:
            recvd += len(connection.recv(5000))
        connection.send(
            b"GET http://localhost:%d/p/200:b@1k HTTP/1.1\r\n" %
            self.server.port)
        connection.send(b"\r\nb")
        recvd = 0
        while recvd < 1024:
            recvd += len(connection.recv(5000))
        connection.close()

        first_flow = self.master.state.flows[0]
        second_flow = self.master.state.flows[1]
        assert first_flow.server_conn.timestamp_tcp_setup
        assert first_flow.server_conn.timestamp_tls_setup is None
        assert second_flow.server_conn.timestamp_tcp_setup
        assert first_flow.server_conn.timestamp_tcp_setup == second_flow.server_conn.timestamp_tcp_setup

    def test_request_ip(self):
        f = self.pathod("200:b@100")
        assert f.status_code == 200
        f = self.master.state.flows[0]
        assert f.server_conn.address == ("127.0.0.1", self.server.port)


class TestProxySSL(tservers.HTTPProxyTest):
    ssl = True

    def test_request_tls_attribute_presence(self):
        # tests that the ssl timestamp is present when ssl is used
        f = self.pathod("304:b@10k")
        assert f.status_code == 304
        first_flow = self.master.state.flows[0]
        assert first_flow.server_conn.timestamp_tls_setup
        assert first_flow.client_conn.tls_extensions

    def test_via(self):
        # tests that the ssl timestamp is present when ssl is used
        f = self.pathod("200:b@10")
        assert f.status_code == 200
        first_flow = self.master.state.flows[0]
        assert not first_flow.server_conn.via


class ARedirectRequest:
    def __init__(self, redirect_port):
        self.redirect_port = redirect_port

    def request(self, f):
        if f.request.path == "/p/201":
            # This part should have no impact, but it should also not cause any exceptions.
            addr = f.live.server_conn.address
            addr2 = ("127.0.0.1", self.redirect_port)
            f.live.set_server(addr2)
            f.live.set_server(addr)

            # This is the actual redirection.
            f.request.port = self.redirect_port

    def response(self, f):
        f.response.content = bytes(f.client_conn.address[1])
        f.response.headers["server-conn-id"] = str(f.server_conn.source_address[1])


class TestRedirectRequest(tservers.HTTPProxyTest):
    ssl = True

    def test_redirect(self):
        """
        Imagine a single HTTPS connection with three requests:

        1. First request should pass through unmodified
        2. Second request will be redirected to a different host by an inline script
        3. Third request should pass through unmodified

        This test verifies that the original destination is restored for the third request.
        """
        self.proxy.tmaster.addons.add(ARedirectRequest(self.server2.port))

        p = self.pathoc()
        with p.connect():
            self.server.clear_log()
            self.server2.clear_log()
            r1 = p.request("get:'/p/200'")
            assert r1.status_code == 200
            assert self.server.last_log()
            assert not self.server2.expect_log(1, 0.5)

            self.server.clear_log()
            self.server2.clear_log()
            r2 = p.request("get:'/p/201'")
            assert r2.status_code == 201
            assert not self.server.expect_log(1, 0.5)
            assert self.server2.last_log()

            self.server.clear_log()
            self.server2.clear_log()
            r3 = p.request("get:'/p/202'")
            assert r3.status_code == 202
            assert self.server.last_log()
            assert not self.server2.expect_log(1, 0.5)

            assert r1.content == r2.content == r3.content


class AStreamRequest:

    """
        Enables the stream flag on the flow for all requests
    """
    def responseheaders(self, f):
        f.response.stream = True


class TestStreamRequest(tservers.HTTPProxyTest):
    def test_stream_simple(self):
        self.proxy.tmaster.addons.add(AStreamRequest())
        p = self.pathoc()
        with p.connect():
            # a request with 100k of data but without content-length
            r1 = p.request("get:'%s/p/200:r:b@100k:d102400'" % self.server.urlbase)
            assert r1.status_code == 200
            assert len(r1.content) > 100000

    def test_stream_multiple(self):
        self.proxy.tmaster.addons.add(AStreamRequest())
        p = self.pathoc()
        with p.connect():
            # simple request with streaming turned on
            r1 = p.request("get:'%s/p/200'" % self.server.urlbase)
            assert r1.status_code == 200

            # now send back 100k of data, streamed but not chunked
            r1 = p.request("get:'%s/p/201:b@100k'" % self.server.urlbase)
            assert r1.status_code == 201

    def test_stream_chunked(self):
        self.proxy.tmaster.addons.add(AStreamRequest())
        connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connection.connect(("127.0.0.1", self.proxy.port))
        fconn = connection.makefile("rb")
        spec = '200:h"Transfer-Encoding"="chunked":r:b"4\\r\\nthis\\r\\n11\\r\\nisatest__reachhex\\r\\n0\\r\\n\\r\\n"'
        connection.send(
            b"GET %s/p/%s HTTP/1.1\r\n" %
            (self.server.urlbase.encode(), spec.encode()))
        connection.send(b"\r\n")

        resp = http1.read_response_head(fconn)

        assert resp.headers["Transfer-Encoding"] == 'chunked'
        assert resp.status_code == 200

        chunks = list(http1.read_body(fconn, None))
        assert chunks == [b"this", b"isatest__reachhex"]

        connection.close()


class AFakeResponse:
    def request(self, f):
        f.response = http.HTTPResponse.wrap(mitmproxy.test.tutils.tresp())


class TestFakeResponse(tservers.HTTPProxyTest):

    def test_fake(self):
        self.proxy.tmaster.addons.add(AFakeResponse())
        f = self.pathod("200")
        assert "header-response" in f.headers


class TestServerConnect(tservers.HTTPProxyTest):
    ssl = True

    @classmethod
    def get_options(cls):
        opts = tservers.HTTPProxyTest.get_options()
        opts.upstream_cert = False
        return opts

    def test_unnecessary_serverconnect(self):
        """A replayed/fake response with no upstream_cert should not connect to an upstream server"""
        self.proxy.tmaster.addons.add(AFakeResponse())
        assert self.pathod("200").status_code == 200
        assert not self.proxy.tmaster.has_log("serverconnect")


class AKillRequest:

    def request(self, f):
        f.reply.kill()


class TestKillRequest(tservers.HTTPProxyTest):
    def test_kill(self):
        self.proxy.tmaster.addons.add(AKillRequest())
        with pytest.raises(exceptions.HttpReadDisconnect):
            self.pathod("200")
        # Nothing should have hit the server
        assert not self.server.expect_log(1, 0.5)


class AKillResponse:
    def response(self, f):
        f.reply.kill()


class TestKillResponse(tservers.HTTPProxyTest):
    def test_kill(self):
        self.proxy.tmaster.addons.add(AKillResponse())
        with pytest.raises(exceptions.HttpReadDisconnect):
            self.pathod("200")
        # The server should have seen a request
        assert self.server.last_log()


class TestTransparentResolveError(tservers.TransparentProxyTest):
    @mock.patch("mitmproxy.platform.original_addr")
    def test_resolve_error(self, original_addr):
        original_addr.side_effect = RuntimeError
        assert self.pathod("304").status_code == 502


class AIncomplete:
    def request(self, f):
        resp = http.HTTPResponse.wrap(mitmproxy.test.tutils.tresp())
        resp.content = None
        f.response = resp


class TestIncompleteResponse(tservers.HTTPProxyTest):
    def test_incomplete(self):
        self.proxy.tmaster.addons.add(AIncomplete())
        assert self.pathod("200").status_code == 502


class TestUpstreamProxy(tservers.HTTPUpstreamProxyTest, CommonMixin):
    ssl = False


class TestUpstreamProxySSL(
        tservers.HTTPUpstreamProxyTest,
        CommonMixin,
        TcpMixin):
    ssl = True

    def _host_pattern_on(self, attr):
        """
        Updates config.check_tcp or check_ignore, depending on attr.
        """
        assert not hasattr(self, "_ignore_%s_backup" % attr)
        backup = []
        for proxy in self.chain:
            old_matcher = getattr(
                proxy.tmaster.server.config,
                "check_%s" %
                attr)
            backup.append(old_matcher)
            setattr(
                proxy.tmaster.server.config,
                "check_%s" % attr,
                HostMatcher([".+:%s" % self.server.port] + old_matcher.patterns)
            )

        setattr(self, "_ignore_%s_backup" % attr, backup)

    def _host_pattern_off(self, attr):
        backup = getattr(self, "_ignore_%s_backup" % attr)
        for proxy in reversed(self.chain):
            setattr(
                proxy.tmaster.server.config,
                "check_%s" % attr,
                backup.pop()
            )

        assert not backup
        delattr(self, "_ignore_%s_backup" % attr)

    def _ignore_on(self):
        super()._ignore_on()
        self._host_pattern_on("ignore")

    def _ignore_off(self):
        super()._ignore_off()
        self._host_pattern_off("ignore")

    def _tcpproxy_on(self):
        super()._tcpproxy_on()
        self._host_pattern_on("tcp")

    def _tcpproxy_off(self):
        super()._tcpproxy_off()
        self._host_pattern_off("tcp")

    def test_simple(self):
        p = self.pathoc()
        with p.connect():
            req = p.request("get:'/p/418:b\"content\"'")
        assert req.content == b"content"
        assert req.status_code == 418

        # CONNECT from pathoc to chain[0],
        assert len(self.proxy.tmaster.state.flows) == 1
        assert self.proxy.tmaster.state.flows[0].server_conn.via
        # request from pathoc to chain[0]
        # CONNECT from proxy to chain[1],
        assert len(self.chain[0].tmaster.state.flows) == 1
        assert self.chain[0].tmaster.state.flows[0].server_conn.via
        # request from proxy to chain[1]
        # request from chain[0] (regular proxy doesn't store CONNECTs)
        assert not self.chain[1].tmaster.state.flows[0].server_conn.via
        assert len(self.chain[1].tmaster.state.flows) == 1

    def test_change_upstream_proxy_connect(self):
        # skip chain[0].
        self.proxy.tmaster.addons.add(
            UpstreamProxyChanger(
                ("127.0.0.1", self.chain[1].port)
            )
        )
        p = self.pathoc()
        with p.connect():
            req = p.request("get:'/p/418'")

        assert req.status_code == 418
        assert len(self.chain[0].tmaster.state.flows) == 0
        assert len(self.chain[1].tmaster.state.flows) == 1

    def test_connect_https_to_http(self):
        """
        https://github.com/mitmproxy/mitmproxy/issues/2329

        Client <- HTTPS -> Proxy <- HTTP -> Proxy <- HTTPS -> Server
        """
        self.proxy.tmaster.addons.add(RewriteToHttp())
        self.chain[1].tmaster.addons.add(RewriteToHttps())
        p = self.pathoc()
        with p.connect():
            resp = p.request("get:'/p/418'")

        assert self.proxy.tmaster.state.flows[0].client_conn.tls_established
        assert not self.proxy.tmaster.state.flows[0].server_conn.tls_established
        assert not self.chain[1].tmaster.state.flows[0].client_conn.tls_established
        assert self.chain[1].tmaster.state.flows[0].server_conn.tls_established
        assert resp.status_code == 418


class RewriteToHttp:
    def http_connect(self, f):
        f.request.scheme = "http"

    def request(self, f):
        f.request.scheme = "http"


class RewriteToHttps:
    def http_connect(self, f):
        f.request.scheme = "https"

    def request(self, f):
        f.request.scheme = "https"


class UpstreamProxyChanger:
    def __init__(self, addr):
        self.address = addr

    def request(self, f):
        f.live.change_upstream_proxy_server(self.address)


class RequestKiller:
    def __init__(self, exclude):
        self.exclude = exclude
        self.k = 0

    def request(self, f):
        self.k += 1
        if self.k not in self.exclude:
            f.reply.kill()


class TestProxyChainingSSLReconnect(tservers.HTTPUpstreamProxyTest):
    ssl = True

    def test_reconnect(self):
        """
        Tests proper functionality of ConnectionHandler.server_reconnect mock.
        If we have a disconnect on a secure connection that's transparently
        proxified to an upstream http proxy, we need to send the CONNECT
        request again.
        """

        class MockOnce:
            call = 0

            def mock_once(self, http1obj, req):
                self.call += 1

                if self.call == 2:
                    headers = http1.assemble_request_head(req)
                    http1obj.server_conn.wfile.write(headers)
                    http1obj.server_conn.wfile.flush()
                    raise exceptions.TcpDisconnect
                else:
                    headers = http1.assemble_request_head(req)
                    http1obj.server_conn.wfile.write(headers)
                    http1obj.server_conn.wfile.flush()

        self.chain[0].tmaster.addons.add(RequestKiller([1, 2]))
        self.chain[1].tmaster.addons.add(RequestKiller([1]))

        p = self.pathoc()
        with p.connect():
            req = p.request("get:'/p/418:b\"content\"'")
            assert req.content == b"content"
            assert req.status_code == 418

            # First request goes through all three proxies exactly once
            assert len(self.proxy.tmaster.state.flows) == 1
            assert len(self.chain[0].tmaster.state.flows) == 1
            assert len(self.chain[1].tmaster.state.flows) == 1

            with mock.patch("mitmproxy.proxy.protocol.http1.Http1Layer.send_request_headers",
                            side_effect=MockOnce().mock_once, autospec=True):
                req = p.request("get:'/p/418:b\"content2\"'")

            assert req.status_code == 502

            assert len(self.proxy.tmaster.state.flows) == 2
            assert len(self.chain[0].tmaster.state.flows) == 2
            # Upstream sees two requests due to reconnection attempt
            assert len(self.chain[1].tmaster.state.flows) == 3
            assert not self.chain[1].tmaster.state.flows[-1].response
            assert not self.chain[1].tmaster.state.flows[-2].response

            # Reconnection failed, so we're now disconnected
            with pytest.raises(exceptions.HttpException):
                p.request("get:'/p/418:b\"content3\"'")


class AddUpstreamCertsToClientChainMixin:

    ssl = True
    servercert = tutils.test_data.path("mitmproxy/data/servercert/trusted-root.pem")
    ssloptions = pathod.SSLOptions(
        cn=b"example.mitmproxy.org",
        certs=[
            ("example.mitmproxy.org", servercert)
        ]
    )

    def test_add_upstream_certs_to_client_chain(self):
        with open(self.servercert, "rb") as f:
            d = f.read()
        upstreamCert = certs.Cert.from_pem(d)
        p = self.pathoc()
        with p.connect():
            upstream_cert_found_in_client_chain = False
            for receivedCert in p.server_certs:
                if receivedCert.digest('sha256') == upstreamCert.digest('sha256'):
                    upstream_cert_found_in_client_chain = True
                    break
            assert(upstream_cert_found_in_client_chain == self.master.options.add_upstream_certs_to_client_chain)


class TestHTTPSAddUpstreamCertsToClientChainTrue(
    AddUpstreamCertsToClientChainMixin,
    tservers.HTTPProxyTest
):
    """
    If --add-server-certs-to-client-chain is True, then the client should
    receive the upstream server's certificates
    """
    @classmethod
    def get_options(cls):
        opts = super().get_options()
        opts.add_upstream_certs_to_client_chain = True
        return opts


class TestHTTPSAddUpstreamCertsToClientChainFalse(
    AddUpstreamCertsToClientChainMixin,
    tservers.HTTPProxyTest
):
    """
    If --add-server-certs-to-client-chain is False, then the client should not
    receive the upstream server's certificates
    """
    @classmethod
    def get_options(cls):
        opts = super().get_options()
        opts.add_upstream_certs_to_client_chain = False
        return opts
