/brz/remove-bazaar

# Copyright (C) 2006-2010 Canonical Ltd

# Copyright (C) 2018 Breezy Developers

#

# 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

"""UI location string handling."""

import re

from . import (

    urlutils,

    )

from .hooks import Hooks

class LocationHooks(Hooks):

    """Dictionary mapping hook name to a list of callables for location hooks.

    """

    def __init__(self):

        Hooks.__init__(self, "breezy.location", "hooks")

        self.add_hook(

            'rewrite_url',

            "Possibly rewrite a URL. Called with a URL to rewrite and the "

            "purpose of the URL.", (3, 0))

hooks = LocationHooks()

def parse_rcp_location(location):

    """Convert a rcp-style location to a URL.

    :param location: Location to convert, e.g. "foo:bar"

    :param scheme: URL scheme to return, defaults to "ssh"

    :return: A URL, e.g. "ssh://foo/bar"

    :raises ValueError: if this is not a RCP-style URL

    """

    m = re.match('^(?P<user>[^@:/]+@)?(?P<host>[^/:]+):(?P<path>.*)$', location)

    if not m:

        raise ValueError("Not a RCP URL")

    if m.group('path').startswith('//'):

        raise ValueError("Not a RCP URL: already looks like a URL")

    return (m.group('host'),

            m.group('user')[:-1] if m.group('user') else None,

            m.group('path'))

def rcp_location_to_url(location, scheme='ssh'):

    """Convert a rcp-style location to a URL.

    :param location: Location to convert, e.g. "foo:bar"

    :param scheme: URL scheme to return, defaults to "ssh"

    :return: A URL, e.g. "ssh://foo/bar"

    :raises ValueError: if this is not a RCP-style URL

    """

    (host, user, path) = parse_rcp_location(location)

    quoted_user = urlutils.quote(user) if user else None

    url = urlutils.URL(

        scheme=scheme, quoted_user=quoted_user,

        port=None, quoted_password=None,

        quoted_host=urlutils.quote(host),

        quoted_path=urlutils.quote(path))

    return str(url)

def parse_cvs_location(location):

    parts = location.split(':')

    if parts[0] or parts[1] not in ('pserver', 'ssh', 'extssh'):

        raise ValueError('not a valid CVS location string')

    try:

        (username, hostname) = parts[2].split('@', 1)

    except IndexError:

        hostname = parts[2]

        username = None

    scheme = parts[1]

    if scheme == 'extssh':

        scheme = 'ssh'

    path = parts[3]

    return (scheme, hostname, username, path)

def cvs_to_url(location):

    """Convert a CVS pserver location string to a URL.

    :param location: pserver URL

    :return: A cvs+pserver URL

    """

    (scheme, host, user, path) = parse_cvs_location(location)

    return str(urlutils.URL(

        scheme='cvs+' + scheme,

        quoted_user=urlutils.quote(user) if user else None,

        quoted_host=urlutils.quote(host),

        quoted_password=None,

        port=None,

        quoted_path=urlutils.quote(path)))

def location_to_url(location, purpose=None):

    """Determine a fully qualified URL from a location string.

    This will try to interpret location as both a URL and a directory path. It

    will also lookup the location in directories.

    :param location: Unicode or byte string object with a location

    :param purpose: Intended method of access (None, 'read' or 'write')

    :raise InvalidURL: If the location is already a URL, but not valid.

    :return: Byte string with resulting URL

    """

    if not isinstance(location, str):

        raise AssertionError("location not a byte or unicode string")

    if location.startswith(':pserver:') or location.startswith(':extssh:'):

        return cvs_to_url(location)

    from .directory_service import directories

    location = directories.dereference(location, purpose)

    # Catch any URLs which are passing Unicode rather than ASCII

    try:

        location = location.encode('ascii')

    except UnicodeError:

        if urlutils.is_url(location):

            raise urlutils.InvalidURL(

                path=location, extra='URLs must be properly escaped')

        location = urlutils.local_path_to_url(location)

    else:

        location = location.decode('ascii')

    if location.startswith("file:") and not location.startswith("file://"):

        return urlutils.join(urlutils.local_path_to_url("."), location[5:])

    try:

        url = rcp_location_to_url(location, scheme="ssh")

    except ValueError:

        pass

    else:

        return url

    if not urlutils.is_url(location):

        return urlutils.local_path_to_url(location)

    for hook in hooks['rewrite_url']:

        location = hook(location, purpose=purpose)

    return location