/brz/remove-bazaar

# Copyright (C) 2006-2017 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

from __future__ import absolute_import

from io import BytesIO

import os

import socket

try:

    from urllib.parse import urlsplit, urlunsplit

except ImportError:

    from urlparse import urlsplit, urlunsplit  # noqa: F401

import urllib

try:

    from xmlrpc.client import (

        __version__ as xmlrpc_version,

        Fault,

        ProtocolError,

        ServerProxy,

        Transport,

        )

except ImportError:  # python < 3

    from xmlrpclib import (

        __version__ as xmlrpc_version,

        Fault,

        ProtocolError,

        Transport,

        ServerProxy,

        )

from ... import (

    errors,

    urlutils,

    __version__ as _breezy_version,

    )

from ...transport import http, get_transport

from .lp_api import (

    DEFAULT_INSTANCE,

    LAUNCHPAD_DOMAINS,

    LAUNCHPAD_BAZAAR_DOMAINS,

    )

# for testing, do

'''

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

'''

class InvalidURL(errors.PathError):

    _fmt = 'Invalid url supplied to transport: "%(path)s"%(extra)s'

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(Transport):

    def __init__(self, scheme):

        Transport.__init__(self)

        self._scheme = scheme

        self.verbose = 0

        self._possible_bzr_transports = []

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

        self.verbose = verbose

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

        transport = get_transport(

            url, possible_transports=self._possible_bzr_transports)

        response = transport.request("POST", url, body=request_body, headers={

            "Content-Type": "text/xml"})

        if response.status != 200:

            raise ProtocolError(url, response.status,

                                response.text, response.headers)

        return self.parse_response(BytesIO(response.data))

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.

    """

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

    # '/RPC2'

    LAUNCHPAD_INSTANCE = {}

    for instance, domain in LAUNCHPAD_DOMAINS.items():

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

    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 = urlutils.parse_url(self.service_url)[0]

            transport = XMLRPCTransport(uri_type)

        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 = 'BRZ_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 InvalidURL(url)

        return cls(lp_instance=lp_instance, **kwargs)

    def get_proxy(self):

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

        url = self.service_url

        return ServerProxy(url, transport=self.transport)

    def send_request(self, method_name, method_params):

        proxy = self.get_proxy()

        method = getattr(proxy, method_name)

        try:

            result = method(*method_params)

        except ProtocolError as 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 as 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 = DEFAULT_INSTANCE

        else:

            instance = self._lp_instance

        return 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 Fault as fault:

                raise InvalidURL(branch_url, str(fault))

            branch_url = result['urls'][0]

            path = urlsplit(branch_url)[2]

        else:

            if hostinfo not in LAUNCHPAD_BAZAAR_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 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

    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.

        """

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

class DryRunLaunchpadService(LaunchpadService):

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

    def send_request(self, method_name, method_params):

        pass

class ResolveLaunchpadPathRequest(BaseRequest):

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

    _methodname = 'resolve_lp_path'

    def __init__(self, path):

        if not path:

            raise InvalidURL(url=path, extra="You must specify a project.")

        self.path = path

    def _request_params(self):

        """Return xmlrpc request parameters"""

        return (self.path,)