~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006-2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

import os

import socket

from urlparse import urlsplit, urlunsplit

import urllib

import xmlrpclib

from bzrlib import (

    config,

    errors,

    urlutils,

    __version__ as _bzrlib_version,

    )

from bzrlib.transport.http import _urllib2_wrappers

# for testing, do

'''

export BZR_LP_XMLRPC_URL=http://xmlrpc.staging.launchpad.net/bazaar/

'''

class InvalidLaunchpadInstance(errors.BzrError):

    _fmt = "%(lp_instance)s is not a valid Launchpad instance."

    def __init__(self, lp_instance):

        errors.BzrError.__init__(self, lp_instance=lp_instance)

class NotLaunchpadBranch(errors.BzrError):

    _fmt = "%(url)s is not registered on Launchpad."

    def __init__(self, url):

        errors.BzrError.__init__(self, url=url)

class XMLRPCTransport(xmlrpclib.Transport):

    def __init__(self, scheme):

        # In python2.4 xmlrpclib.Transport is a old-style class, and does not

        # define __init__, so we check first

        init = getattr(xmlrpclib.Transport, '__init__', None)

        if init is not None:

            init(self)

        self._scheme = scheme

        self._opener = _urllib2_wrappers.Opener()

        self.verbose = 0

    def request(self, host, handler, request_body, verbose=0):

        self.verbose = verbose

        url = self._scheme + "://" + host + handler

        request = _urllib2_wrappers.Request("POST", url, request_body)

        # FIXME: _urllib2_wrappers will override user-agent with its own

        # request.add_header("User-Agent", self.user_agent)

        request.add_header("Content-Type", "text/xml")

        response = self._opener.open(request)

        if response.code != 200:

            raise xmlrpclib.ProtocolError(host + handler, response.code,

                                          response.msg, response.info())

        return self.parse_response(response)

class LaunchpadService(object):

    """A service to talk to Launchpad via XMLRPC.

    See http://wiki.bazaar.canonical.com/Specs/LaunchpadRpc for the methods we can call.

    """

    LAUNCHPAD_DOMAINS = {

        'production': 'launchpad.net',

        'edge': 'edge.launchpad.net',

        'staging': 'staging.launchpad.net',

        'demo': 'demo.launchpad.net',

        'dev': 'launchpad.dev',

        }

    # NB: these should always end in a slash to avoid xmlrpclib appending

    # '/RPC2'

    LAUNCHPAD_INSTANCE = {}

    for instance, domain in LAUNCHPAD_DOMAINS.iteritems():

        LAUNCHPAD_INSTANCE[instance] = 'https://xmlrpc.%s/bazaar/' % domain

    # Previously 'edge' was used to avoid a launchpad bug with redirection

    DEFAULT_INSTANCE = 'production'

    DEFAULT_SERVICE_URL = LAUNCHPAD_INSTANCE[DEFAULT_INSTANCE]

    transport = None

    registrant_email = None

    registrant_password = None

    def __init__(self, transport=None, lp_instance=None):

        """Construct a new service talking to the launchpad rpc server"""

        self._lp_instance = lp_instance

        if transport is None:

            uri_type = urllib.splittype(self.service_url)[0]

            transport = XMLRPCTransport(uri_type)

            transport.user_agent = 'bzr/%s (xmlrpclib/%s)' \

                    % (_bzrlib_version, xmlrpclib.__version__)

        self.transport = transport

    @property

    def service_url(self):

        """Return the http or https url for the xmlrpc server.

        This does not include the username/password credentials.

        """

        key = 'BZR_LP_XMLRPC_URL'

        if key in os.environ:

            return os.environ[key]

        elif self._lp_instance is not None:

            try:

                return self.LAUNCHPAD_INSTANCE[self._lp_instance]

            except KeyError:

                raise InvalidLaunchpadInstance(self._lp_instance)

        else:

            return self.DEFAULT_SERVICE_URL

    @classmethod

    def for_url(cls, url, **kwargs):

        """Return the Launchpad service corresponding to the given URL."""

        result = urlsplit(url)

        lp_instance = result[1]

        if lp_instance == '':

            lp_instance = None

        elif lp_instance not in cls.LAUNCHPAD_INSTANCE:

            raise errors.InvalidURL(path=url)

        return cls(lp_instance=lp_instance, **kwargs)

    def get_proxy(self, authenticated):

        """Return the proxy for XMLRPC requests."""

        if authenticated:

            # auth info must be in url

            # TODO: if there's no registrant email perhaps we should

            # just connect anonymously?

            scheme, hostinfo, path = urlsplit(self.service_url)[:3]

            if '@' in hostinfo:

                raise AssertionError(hostinfo)

            if self.registrant_email is None:

                raise AssertionError()

            if self.registrant_password is None:

                raise AssertionError()

            # TODO: perhaps fully quote the password to make it very slightly

            # obscured

            # TODO: can we perhaps add extra Authorization headers

            # directly to the request, rather than putting this into

            # the url?  perhaps a bit more secure against accidentally

            # revealing it.  std66 s3.2.1 discourages putting the

            # password in the url.

            hostinfo = '%s:%s@%s' % (urllib.quote(self.registrant_email),

                                     urllib.quote(self.registrant_password),

                                     hostinfo)

            url = urlunsplit((scheme, hostinfo, path, '', ''))

        else:

            url = self.service_url

        return xmlrpclib.ServerProxy(url, transport=self.transport)

    def gather_user_credentials(self):

        """Get the password from the user."""

        the_config = config.GlobalConfig()

        self.registrant_email = the_config.user_email()

        if self.registrant_password is None:

            auth = config.AuthenticationConfig()

            scheme, hostinfo = urlsplit(self.service_url)[:2]

            prompt = 'launchpad.net password for %s: ' % \

                    self.registrant_email

            # We will reuse http[s] credentials if we can, prompt user

            # otherwise

            self.registrant_password = auth.get_password(scheme, hostinfo,

                                                         self.registrant_email,

                                                         prompt=prompt)

    def send_request(self, method_name, method_params, authenticated):

        proxy = self.get_proxy(authenticated)

        method = getattr(proxy, method_name)

        try:

            result = method(*method_params)

        except xmlrpclib.ProtocolError, e:

            if e.errcode == 301:

                # TODO: This can give a ProtocolError representing a 301 error, whose

                # e.headers['location'] tells where to go and e.errcode==301; should

                # probably log something and retry on the new url.

                raise NotImplementedError("should resend request to %s, but this isn't implemented"

                        % e.headers.get('Location', 'NO-LOCATION-PRESENT'))

            else:

                # we don't want to print the original message because its

                # str representation includes the plaintext password.

                # TODO: print more headers to help in tracking down failures

                raise errors.BzrError("xmlrpc protocol error connecting to %s: %s %s"

                        % (self.service_url, e.errcode, e.errmsg))

        except socket.gaierror, e:

            raise errors.ConnectionError(

                "Could not resolve '%s'" % self.domain,

                orig_error=e)

        return result

    @property

    def domain(self):

        if self._lp_instance is None:

            instance = self.DEFAULT_INSTANCE

        else:

            instance = self._lp_instance

        return self.LAUNCHPAD_DOMAINS[instance]

    def _guess_branch_path(self, branch_url, _request_factory=None):

        scheme, hostinfo, path = urlsplit(branch_url)[:3]

        if _request_factory is None:

            _request_factory = ResolveLaunchpadPathRequest

        if scheme == 'lp':

            resolve = _request_factory(path)

            try:

                result = resolve.submit(self)

            except xmlrpclib.Fault, fault:

                raise errors.InvalidURL(branch_url, str(fault))

            branch_url = result['urls'][0]

            path = urlsplit(branch_url)[2]

        else:

            domains = (

                'bazaar.%s' % domain

                for domain in self.LAUNCHPAD_DOMAINS.itervalues())

            if hostinfo not in domains:

                raise NotLaunchpadBranch(branch_url)

        return path.lstrip('/')

    def get_web_url_from_branch_url(self, branch_url, _request_factory=None):

        """Get the Launchpad web URL for the given branch URL.

        :raise errors.InvalidURL: if 'branch_url' cannot be identified as a

            Launchpad branch URL.

        :return: The URL of the branch on Launchpad.

        """

        path = self._guess_branch_path(branch_url, _request_factory)

        return urlutils.join('https://code.%s' % self.domain, path)

class BaseRequest(object):

    """Base request for talking to a XMLRPC server."""

    # Set this to the XMLRPC method name.

    _methodname = None

    _authenticated = True

    def _request_params(self):

        """Return the arguments to pass to the method"""

        raise NotImplementedError(self._request_params)

    def submit(self, service):

        """Submit request to Launchpad XMLRPC server.

        :param service: LaunchpadService indicating where to send

            the request and the authentication credentials.

        """

        return service.send_request(self._methodname, self._request_params(),

                                    self._authenticated)

class DryRunLaunchpadService(LaunchpadService):

    """Service that just absorbs requests without sending to server.

    The dummy service does not need authentication.

    """

    def send_request(self, method_name, method_params, authenticated):

        pass

    def gather_user_credentials(self):

        pass

class BranchRegistrationRequest(BaseRequest):

    """Request to tell Launchpad about a bzr branch."""

    _methodname = 'register_branch'

    def __init__(self, branch_url,

                 branch_name='',

                 branch_title='',

                 branch_description='',

                 author_email='',

                 product_name='',

                 ):

        if not branch_url:

            raise errors.InvalidURL(branch_url, "You need to specify a non-empty branch URL.")

        self.branch_url = branch_url

        if branch_name:

            self.branch_name = branch_name

        else:

            self.branch_name = self._find_default_branch_name(self.branch_url)

        self.branch_title = branch_title

        self.branch_description = branch_description

        self.author_email = author_email

        self.product_name = product_name

    def _request_params(self):

        """Return xmlrpc request parameters"""

        # This must match the parameter tuple expected by Launchpad for this

        # method

        return (self.branch_url,

                self.branch_name,

                self.branch_title,

                self.branch_description,

                self.author_email,

                self.product_name,

               )

    def _find_default_branch_name(self, branch_url):

        i = branch_url.rfind('/')

        return branch_url[i+1:]

class BranchBugLinkRequest(BaseRequest):

    """Request to link a bzr branch in Launchpad to a bug."""

    _methodname = 'link_branch_to_bug'

    def __init__(self, branch_url, bug_id):

        self.bug_id = bug_id

        self.branch_url = branch_url

    def _request_params(self):

        """Return xmlrpc request parameters"""

        # This must match the parameter tuple expected by Launchpad for this

        # method

        return (self.branch_url, self.bug_id, '')

class ResolveLaunchpadPathRequest(BaseRequest):

    """Request to resolve the path component of an lp: URL."""

    _methodname = 'resolve_lp_path'

    _authenticated = False

    def __init__(self, path):

        if not path:

            raise errors.InvalidURL(path=path,

                                    extra="You must specify a project.")

        self.path = path

    def _request_params(self):

        """Return xmlrpc request parameters"""

        return (self.path,)