~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

from cStringIO import StringIO

import errno

import md5

import re

import sha

import socket

import threading

import time

import urllib2

import urlparse

from bzrlib import (

    errors,

    tests,

    transport,

    )

from bzrlib.smart import medium, protocol

from bzrlib.tests import http_server

class HTTPServerWithSmarts(http_server.HttpServer):

    """HTTPServerWithSmarts extends the HttpServer with POST methods that will

    trigger a smart server to execute with a transport rooted at the rootdir of

    the HTTP server.

    """

    def __init__(self, protocol_version=None):

        http_server.HttpServer.__init__(self, SmartRequestHandler,

                                        protocol_version=protocol_version)

class SmartRequestHandler(http_server.TestingHTTPRequestHandler):

    """Extend TestingHTTPRequestHandler to support smart client POSTs."""

    def do_POST(self):

        """Hand the request off to a smart server instance."""

        self.send_response(200)

        self.send_header("Content-type", "application/octet-stream")

        t = transport.get_transport(self.server.test_case_server._home_dir)

        # if this fails, we should return 400 bad request, but failure is

        # failure for now - RBC 20060919

        data_length = int(self.headers['Content-Length'])

        # TODO: We might like to support streaming responses.  1.0 allows no

        # Content-length in this case, so for integrity we should perform our

        # own chunking within the stream.

        # 1.1 allows chunked responses, and in this case we could chunk using

        # the HTTP chunking as this will allow HTTP persistence safely, even if

        # we have to stop early due to error, but we would also have to use the

        # HTTP trailer facility which may not be widely available.

        request_bytes = self.rfile.read(data_length)

        protocol_factory, unused_bytes = medium._get_protocol_factory_for_bytes(

            request_bytes)

        out_buffer = StringIO()

        smart_protocol_request = protocol_factory(t, out_buffer.write, '/')

        # Perhaps there should be a SmartServerHTTPMedium that takes care of

        # feeding the bytes in the http request to the smart_protocol_request,

        # but for now it's simpler to just feed the bytes directly.

        smart_protocol_request.accept_bytes(unused_bytes)

        if not (smart_protocol_request.next_read_size() == 0):

            raise errors.SmartProtocolError(

                "not finished reading, but all data sent to protocol.")

        self.send_header("Content-Length", str(len(out_buffer.getvalue())))

        self.end_headers()

        self.wfile.write(out_buffer.getvalue())

class TestCaseWithWebserver(tests.TestCaseWithTransport):

    """A support class that provides readonly urls that are http://.

    This is done by forcing the readonly server to be an http

    one. This will currently fail if the primary transport is not

    backed by regular disk files.

    """

    def setUp(self):

        super(TestCaseWithWebserver, self).setUp()

        self.transport_readonly_server = http_server.HttpServer

class TestCaseWithTwoWebservers(TestCaseWithWebserver):

    """A support class providing readonly urls on two servers that are http://.

    We set up two webservers to allows various tests involving

    proxies or redirections from one server to the other.

    """

    def setUp(self):

        super(TestCaseWithTwoWebservers, self).setUp()

        self.transport_secondary_server = http_server.HttpServer

        self.__secondary_server = None

    def create_transport_secondary_server(self):

        """Create a transport server from class defined at init.

        This is mostly a hook for daughter classes.

        """

        return self.transport_secondary_server()

    def get_secondary_server(self):

        """Get the server instance for the secondary transport."""

        if self.__secondary_server is None:

            self.__secondary_server = self.create_transport_secondary_server()

            self.__secondary_server.setUp()

            self.addCleanup(self.__secondary_server.tearDown)

        return self.__secondary_server

class ProxyServer(http_server.HttpServer):

    """A proxy test server for http transports."""

    proxy_requests = True

class RedirectRequestHandler(http_server.TestingHTTPRequestHandler):

    """Redirect all request to the specified server"""

    def parse_request(self):

        """Redirect a single HTTP request to another host"""

        valid = http_server.TestingHTTPRequestHandler.parse_request(self)

        if valid:

            tcs = self.server.test_case_server

            code, target = tcs.is_redirected(self.path)

            if code is not None and target is not None:

                # Redirect as instructed

                self.send_response(code)

                self.send_header('Location', target)

                # We do not send a body

                self.send_header('Content-Length', '0')

                self.end_headers()

                return False # The job is done

            else:

                # We leave the parent class serve the request

                pass

        return valid

class HTTPServerRedirecting(http_server.HttpServer):

    """An HttpServer redirecting to another server """

    def __init__(self, request_handler=RedirectRequestHandler,

                 protocol_version=None):

        http_server.HttpServer.__init__(self, request_handler,

                                        protocol_version=protocol_version)

        # redirections is a list of tuples (source, target, code)

        # - source is a regexp for the paths requested

        # - target is a replacement for re.sub describing where

        #   the request will be redirected

        # - code is the http error code associated to the

        #   redirection (301 permanent, 302 temporarry, etc

        self.redirections = []

    def redirect_to(self, host, port):

        """Redirect all requests to a specific host:port"""

        self.redirections = [('(.*)',

                              r'http://%s:%s\1' % (host, port) ,

                              301)]

    def is_redirected(self, path):

        """Is the path redirected by this server.

        :param path: the requested relative path

        :returns: a tuple (code, target) if a matching

             redirection is found, (None, None) otherwise.

        """

        code = None

        target = None

        for (rsource, rtarget, rcode) in self.redirections:

            target, match = re.subn(rsource, rtarget, path)

            if match:

                code = rcode

                break # The first match wins

            else:

                target = None

        return code, target

class TestCaseWithRedirectedWebserver(TestCaseWithTwoWebservers):

   """A support class providing redirections from one server to another.

   We set up two webservers to allows various tests involving

   redirections.

   The 'old' server is redirected to the 'new' server.

   """

   def create_transport_secondary_server(self):

       """Create the secondary server redirecting to the primary server"""

       new = self.get_readonly_server()

       redirecting = HTTPServerRedirecting()

       redirecting.redirect_to(new.host, new.port)

       return redirecting

   def setUp(self):

       super(TestCaseWithRedirectedWebserver, self).setUp()

       # The redirections will point to the new server

       self.new_server = self.get_readonly_server()

       # The requests to the old server will be redirected

       self.old_server = self.get_secondary_server()

class AuthRequestHandler(http_server.TestingHTTPRequestHandler):

    """Requires an authentication to process requests.

    This is intended to be used with a server that always and

    only use one authentication scheme (implemented by daughter

    classes).

    """

    # The following attributes should be defined in the server

    # - auth_header_sent: the header name sent to require auth

    # - auth_header_recv: the header received containing auth

    # - auth_error_code: the error code to indicate auth required

    def do_GET(self):

        if self.authorized():

            return http_server.TestingHTTPRequestHandler.do_GET(self)

        else:

            # Note that we must update test_case_server *before*

            # sending the error or the client may try to read it

            # before we have sent the whole error back.

            tcs = self.server.test_case_server

            tcs.auth_required_errors += 1

            self.send_response(tcs.auth_error_code)

            self.send_header_auth_reqed()

            # We do not send a body

            self.send_header('Content-Length', '0')

            self.end_headers()

            return

class BasicAuthRequestHandler(AuthRequestHandler):

    """Implements the basic authentication of a request"""

    def authorized(self):

        tcs = self.server.test_case_server

        if tcs.auth_scheme != 'basic':

            return False

        auth_header = self.headers.get(tcs.auth_header_recv, None)

        if auth_header:

            scheme, raw_auth = auth_header.split(' ', 1)

            if scheme.lower() == tcs.auth_scheme:

                user, password = raw_auth.decode('base64').split(':')

                return tcs.authorized(user, password)

        return False

    def send_header_auth_reqed(self):

        tcs = self.server.test_case_server

        self.send_header(tcs.auth_header_sent,

                         'Basic realm="%s"' % tcs.auth_realm)

# FIXME: We could send an Authentication-Info header too when

# the authentication is succesful

class DigestAuthRequestHandler(AuthRequestHandler):

    """Implements the digest authentication of a request.

    We need persistence for some attributes and that can't be

    achieved here since we get instantiated for each request. We

    rely on the DigestAuthServer to take care of them.

    """

    def authorized(self):

        tcs = self.server.test_case_server

        if tcs.auth_scheme != 'digest':

            return False

        auth_header = self.headers.get(tcs.auth_header_recv, None)

        if auth_header is None:

            return False

        scheme, auth = auth_header.split(None, 1)

        if scheme.lower() == tcs.auth_scheme:

            auth_dict = urllib2.parse_keqv_list(urllib2.parse_http_list(auth))

            return tcs.digest_authorized(auth_dict, self.command)

        return False

    def send_header_auth_reqed(self):

        tcs = self.server.test_case_server

        header = 'Digest realm="%s", ' % tcs.auth_realm

        header += 'nonce="%s", algorithm="%s", qop="auth"' % (tcs.auth_nonce,

                                                              'MD5')

        self.send_header(tcs.auth_header_sent,header)

class AuthServer(http_server.HttpServer):

    """Extends HttpServer with a dictionary of passwords.

    This is used as a base class for various schemes which should

    all use or redefined the associated AuthRequestHandler.

    Note that no users are defined by default, so add_user should

    be called before issuing the first request.

    """

    # The following attributes should be set dy daughter classes

    # and are used by AuthRequestHandler.

    auth_header_sent = None

    auth_header_recv = None

    auth_error_code = None

    auth_realm = "Thou should not pass"

    def __init__(self, request_handler, auth_scheme,

                 protocol_version=None):

        http_server.HttpServer.__init__(self, request_handler,

                                        protocol_version=protocol_version)

        self.auth_scheme = auth_scheme

        self.password_of = {}

        self.auth_required_errors = 0

    def add_user(self, user, password):

        """Declare a user with an associated password.

        password can be empty, use an empty string ('') in that

        case, not None.

        """

        self.password_of[user] = password

    def authorized(self, user, password):

        """Check that the given user provided the right password"""

        expected_password = self.password_of.get(user, None)

        return expected_password is not None and password == expected_password

# FIXME: There is some code duplication with

# _urllib2_wrappers.py.DigestAuthHandler. If that duplication

# grows, it may require a refactoring. Also, we don't implement

# SHA algorithm nor MD5-sess here, but that does not seem worth

# it.

class DigestAuthServer(AuthServer):

    """A digest authentication server"""

    auth_nonce = 'now!'

    def __init__(self, request_handler, auth_scheme,

                 protocol_version=None):

        AuthServer.__init__(self, request_handler, auth_scheme,

                            protocol_version=protocol_version)

    def digest_authorized(self, auth, command):

        nonce = auth['nonce']

        if nonce != self.auth_nonce:

            return False

        realm = auth['realm']

        if realm != self.auth_realm:

            return False

        user = auth['username']

        if not self.password_of.has_key(user):

            return False

        algorithm= auth['algorithm']

        if algorithm != 'MD5':

            return False

        qop = auth['qop']

        if qop != 'auth':

            return False

        password = self.password_of[user]

        # Recalculate the response_digest to compare with the one

        # sent by the client

        A1 = '%s:%s:%s' % (user, realm, password)

        A2 = '%s:%s' % (command, auth['uri'])

        H = lambda x: md5.new(x).hexdigest()

        KD = lambda secret, data: H("%s:%s" % (secret, data))

        nonce_count = int(auth['nc'], 16)

        ncvalue = '%08x' % nonce_count

        cnonce = auth['cnonce']

        noncebit = '%s:%s:%s:%s:%s' % (nonce, ncvalue, cnonce, qop, H(A2))

        response_digest = KD(H(A1), noncebit)

        return response_digest == auth['response']

class HTTPAuthServer(AuthServer):

    """An HTTP server requiring authentication"""

    def init_http_auth(self):

        self.auth_header_sent = 'WWW-Authenticate'

        self.auth_header_recv = 'Authorization'

        self.auth_error_code = 401

class ProxyAuthServer(AuthServer):

    """A proxy server requiring authentication"""

    def init_proxy_auth(self):

        self.proxy_requests = True

        self.auth_header_sent = 'Proxy-Authenticate'

        self.auth_header_recv = 'Proxy-Authorization'

        self.auth_error_code = 407

class HTTPBasicAuthServer(HTTPAuthServer):

    """An HTTP server requiring basic authentication"""

    def __init__(self, protocol_version=None):

        HTTPAuthServer.__init__(self, BasicAuthRequestHandler, 'basic',

                                protocol_version=protocol_version)

        self.init_http_auth()

class HTTPDigestAuthServer(DigestAuthServer, HTTPAuthServer):

    """An HTTP server requiring digest authentication"""

    def __init__(self, protocol_version=None):

        DigestAuthServer.__init__(self, DigestAuthRequestHandler, 'digest',

                                  protocol_version=protocol_version)

        self.init_http_auth()

class ProxyBasicAuthServer(ProxyAuthServer):

    """A proxy server requiring basic authentication"""

    def __init__(self, protocol_version=None):

        ProxyAuthServer.__init__(self, BasicAuthRequestHandler, 'basic',

                                 protocol_version=protocol_version)

        self.init_proxy_auth()

class ProxyDigestAuthServer(DigestAuthServer, ProxyAuthServer):

    """A proxy server requiring basic authentication"""

    def __init__(self, protocol_version=None):

        ProxyAuthServer.__init__(self, DigestAuthRequestHandler, 'digest',

                                 protocol_version=protocol_version)

        self.init_proxy_auth()