~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 Robey Pointer <robey@lag.net>, 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

"""

A stub SFTP server for loopback SFTP testing.

Adapted from the one in paramiko's unit tests.

"""

import os

from paramiko import ServerInterface, SFTPServerInterface, SFTPServer, SFTPAttributes, \

    SFTPHandle, SFTP_OK, AUTH_SUCCESSFUL, OPEN_SUCCEEDED

import sys

from bzrlib.osutils import pathjoin

from bzrlib.trace import mutter

class StubServer (ServerInterface):

    def __init__(self, test_case):

        ServerInterface.__init__(self)

        self._test_case = test_case

    def check_auth_password(self, username, password):

        # all are allowed

        self._test_case.log('sftpserver - authorizing: %s' % (username,))

        return AUTH_SUCCESSFUL

    def check_channel_request(self, kind, chanid):

        self._test_case.log('sftpserver - channel request: %s, %s' % (kind, chanid))

        return OPEN_SUCCEEDED

class StubSFTPHandle (SFTPHandle):

    def stat(self):

        try:

            return SFTPAttributes.from_stat(os.fstat(self.readfile.fileno()))

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

    def chattr(self, attr):

        # python doesn't have equivalents to fchown or fchmod, so we have to

        # use the stored filename

        mutter('Changing permissions on %s to %s', self.filename, attr)

        try:

            SFTPServer.set_file_attr(self.filename, attr)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

class StubSFTPServer (SFTPServerInterface):

    def __init__(self, server, root, home=None):

        SFTPServerInterface.__init__(self, server)

        # All paths are actually relative to 'root'.

        # this is like implementing chroot().

        self.root = root

        if home is None:

            self.home = ''

        else:

            if not home.startswith(self.root):

                raise AssertionError(

                    "home must be a subdirectory of root (%s vs %s)"

                    % (home, root))

            self.home = home[len(self.root):]

        if self.home.startswith('/'):

            self.home = self.home[1:]

        server._test_case.log('sftpserver - new connection')

    def _realpath(self, path):

        # paths returned from self.canonicalize() always start with

        # a path separator. So if 'root' is just '/', this would cause

        # a double slash at the beginning '//home/dir'.

        if self.root == '/':

            return self.canonicalize(path)

        return self.root + self.canonicalize(path)

    if sys.platform == 'win32':

        def canonicalize(self, path):

            # Win32 sftp paths end up looking like

            #     sftp://host@foo/h:/foo/bar

            # which means absolute paths look like:

            #     /h:/foo/bar

            # and relative paths stay the same:

            #     foo/bar

            # win32 needs to use the Unicode APIs. so we require the

            # paths to be utf8 (Linux just uses bytestreams)

            thispath = path.decode('utf8')

            if path.startswith('/'):

                # Abspath H:/foo/bar

                return os.path.normpath(thispath[1:])

            else:

                return os.path.normpath(os.path.join(self.home, thispath))

    else:

        def canonicalize(self, path):

            if os.path.isabs(path):

                return os.path.normpath(path)

            else:

                return os.path.normpath('/' + os.path.join(self.home, path))

    def chattr(self, path, attr):

        try:

            SFTPServer.set_file_attr(path, attr)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

        return SFTP_OK

    def list_folder(self, path):

        path = self._realpath(path)

        try:

            out = [ ]

            # TODO: win32 incorrectly lists paths with non-ascii if path is not

            # unicode. However on Linux the server should only deal with

            # bytestreams and posix.listdir does the right thing

            if sys.platform == 'win32':

                flist = [f.encode('utf8') for f in os.listdir(path)]

            else:

                flist = os.listdir(path)

            for fname in flist:

                attr = SFTPAttributes.from_stat(os.stat(pathjoin(path, fname)))

                attr.filename = fname

                out.append(attr)

            return out

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

    def stat(self, path):

        path = self._realpath(path)

        try:

            return SFTPAttributes.from_stat(os.stat(path))

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

    def lstat(self, path):

        path = self._realpath(path)

        try:

            return SFTPAttributes.from_stat(os.lstat(path))

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

    def open(self, path, flags, attr):

        path = self._realpath(path)

        try:

            flags |= getattr(os, 'O_BINARY', 0)

            if getattr(attr, 'st_mode', None):

                fd = os.open(path, flags, attr.st_mode)

            else:

                # os.open() defaults to 0777 which is

                # an odd default mode for files

                fd = os.open(path, flags, 0666)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

        if (flags & os.O_CREAT) and (attr is not None):

            attr._flags &= ~attr.FLAG_PERMISSIONS

            SFTPServer.set_file_attr(path, attr)

        if flags & os.O_WRONLY:

            fstr = 'wb'

        elif flags & os.O_RDWR:

            fstr = 'rb+'

        else:

            # O_RDONLY (== 0)

            fstr = 'rb'

        try:

            f = os.fdopen(fd, fstr)

        except (IOError, OSError), e:

            return SFTPServer.convert_errno(e.errno)

        fobj = StubSFTPHandle()

        fobj.filename = path

        fobj.readfile = f

        fobj.writefile = f

        return fobj

    def remove(self, path):

        path = self._realpath(path)

        try:

            os.remove(path)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

        return SFTP_OK

    def rename(self, oldpath, newpath):

        oldpath = self._realpath(oldpath)

        newpath = self._realpath(newpath)

        try:

            os.rename(oldpath, newpath)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

        return SFTP_OK

    def mkdir(self, path, attr):

        path = self._realpath(path)

        try:

            # Using getattr() in case st_mode is None or 0

            # both evaluate to False

            if getattr(attr, 'st_mode', None):

                os.mkdir(path, attr.st_mode)

            else:

                os.mkdir(path)

            if attr is not None:

                attr._flags &= ~attr.FLAG_PERMISSIONS

                SFTPServer.set_file_attr(path, attr)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

        return SFTP_OK

    def rmdir(self, path):

        path = self._realpath(path)

        try:

            os.rmdir(path)

        except OSError, e:

            return SFTPServer.convert_errno(e.errno)

        return SFTP_OK

    # removed: chattr, symlink, readlink

    # (nothing in bzr's sftp transport uses those)