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244 lines
8.2 KiB
Python
244 lines
8.2 KiB
Python
# Copyright (C) 2003-2006 Robey Pointer <robeypointer@gmail.com>
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#
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# This file is part of paramiko.
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#
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# Paramiko is free software; you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation; either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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import stat
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import time
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from paramiko.common import x80000000, o700, o70, xffffffff
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from paramiko.py3compat import long, b
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class SFTPAttributes(object):
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"""
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Representation of the attributes of a file (or proxied file) for SFTP in
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client or server mode. It attemps to mirror the object returned by
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`os.stat` as closely as possible, so it may have the following fields,
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with the same meanings as those returned by an `os.stat` object:
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- ``st_size``
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- ``st_uid``
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- ``st_gid``
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- ``st_mode``
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- ``st_atime``
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- ``st_mtime``
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Because SFTP allows flags to have other arbitrary named attributes, these
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are stored in a dict named ``attr``. Occasionally, the filename is also
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stored, in ``filename``.
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"""
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FLAG_SIZE = 1
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FLAG_UIDGID = 2
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FLAG_PERMISSIONS = 4
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FLAG_AMTIME = 8
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FLAG_EXTENDED = x80000000
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def __init__(self):
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"""
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Create a new (empty) SFTPAttributes object. All fields will be empty.
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"""
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self._flags = 0
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self.st_size = None
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self.st_uid = None
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self.st_gid = None
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self.st_mode = None
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self.st_atime = None
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self.st_mtime = None
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self.attr = {}
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@classmethod
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def from_stat(cls, obj, filename=None):
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"""
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Create an `.SFTPAttributes` object from an existing ``stat`` object (an
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object returned by `os.stat`).
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:param object obj: an object returned by `os.stat` (or equivalent).
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:param str filename: the filename associated with this file.
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:return: new `.SFTPAttributes` object with the same attribute fields.
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"""
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attr = cls()
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attr.st_size = obj.st_size
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attr.st_uid = obj.st_uid
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attr.st_gid = obj.st_gid
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attr.st_mode = obj.st_mode
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attr.st_atime = obj.st_atime
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attr.st_mtime = obj.st_mtime
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if filename is not None:
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attr.filename = filename
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return attr
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def __repr__(self):
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return "<SFTPAttributes: {}>".format(self._debug_str())
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# ...internals...
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@classmethod
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def _from_msg(cls, msg, filename=None, longname=None):
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attr = cls()
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attr._unpack(msg)
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if filename is not None:
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attr.filename = filename
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if longname is not None:
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attr.longname = longname
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return attr
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def _unpack(self, msg):
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self._flags = msg.get_int()
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if self._flags & self.FLAG_SIZE:
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self.st_size = msg.get_int64()
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if self._flags & self.FLAG_UIDGID:
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self.st_uid = msg.get_int()
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self.st_gid = msg.get_int()
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if self._flags & self.FLAG_PERMISSIONS:
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self.st_mode = msg.get_int()
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if self._flags & self.FLAG_AMTIME:
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self.st_atime = msg.get_int()
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self.st_mtime = msg.get_int()
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if self._flags & self.FLAG_EXTENDED:
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count = msg.get_int()
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for i in range(count):
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self.attr[msg.get_string()] = msg.get_string()
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def _pack(self, msg):
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self._flags = 0
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if self.st_size is not None:
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self._flags |= self.FLAG_SIZE
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if (self.st_uid is not None) and (self.st_gid is not None):
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self._flags |= self.FLAG_UIDGID
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if self.st_mode is not None:
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self._flags |= self.FLAG_PERMISSIONS
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if (self.st_atime is not None) and (self.st_mtime is not None):
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self._flags |= self.FLAG_AMTIME
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if len(self.attr) > 0:
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self._flags |= self.FLAG_EXTENDED
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msg.add_int(self._flags)
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if self._flags & self.FLAG_SIZE:
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msg.add_int64(self.st_size)
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if self._flags & self.FLAG_UIDGID:
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msg.add_int(self.st_uid)
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msg.add_int(self.st_gid)
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if self._flags & self.FLAG_PERMISSIONS:
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msg.add_int(self.st_mode)
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if self._flags & self.FLAG_AMTIME:
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# throw away any fractional seconds
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msg.add_int(long(self.st_atime))
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msg.add_int(long(self.st_mtime))
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if self._flags & self.FLAG_EXTENDED:
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msg.add_int(len(self.attr))
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for key, val in self.attr.items():
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msg.add_string(key)
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msg.add_string(val)
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return
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def _debug_str(self):
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out = "[ "
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if self.st_size is not None:
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out += "size={} ".format(self.st_size)
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if (self.st_uid is not None) and (self.st_gid is not None):
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out += "uid={} gid={} ".format(self.st_uid, self.st_gid)
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if self.st_mode is not None:
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out += "mode=" + oct(self.st_mode) + " "
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if (self.st_atime is not None) and (self.st_mtime is not None):
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out += "atime={} mtime={} ".format(self.st_atime, self.st_mtime)
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for k, v in self.attr.items():
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out += '"{}"={!r} '.format(str(k), v)
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out += "]"
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return out
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@staticmethod
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def _rwx(n, suid, sticky=False):
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if suid:
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suid = 2
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out = "-r"[n >> 2] + "-w"[(n >> 1) & 1]
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if sticky:
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out += "-xTt"[suid + (n & 1)]
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else:
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out += "-xSs"[suid + (n & 1)]
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return out
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def __str__(self):
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"""create a unix-style long description of the file (like ls -l)"""
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if self.st_mode is not None:
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kind = stat.S_IFMT(self.st_mode)
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if kind == stat.S_IFIFO:
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ks = "p"
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elif kind == stat.S_IFCHR:
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ks = "c"
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elif kind == stat.S_IFDIR:
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ks = "d"
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elif kind == stat.S_IFBLK:
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ks = "b"
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elif kind == stat.S_IFREG:
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ks = "-"
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elif kind == stat.S_IFLNK:
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ks = "l"
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elif kind == stat.S_IFSOCK:
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ks = "s"
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else:
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ks = "?"
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ks += self._rwx(
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(self.st_mode & o700) >> 6, self.st_mode & stat.S_ISUID
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)
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ks += self._rwx(
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(self.st_mode & o70) >> 3, self.st_mode & stat.S_ISGID
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)
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ks += self._rwx(
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self.st_mode & 7, self.st_mode & stat.S_ISVTX, True
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)
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else:
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ks = "?---------"
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# compute display date
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if (self.st_mtime is None) or (self.st_mtime == xffffffff):
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# shouldn't really happen
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datestr = "(unknown date)"
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else:
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if abs(time.time() - self.st_mtime) > 15552000:
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# (15552000 = 6 months)
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datestr = time.strftime(
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"%d %b %Y", time.localtime(self.st_mtime)
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)
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else:
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datestr = time.strftime(
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"%d %b %H:%M", time.localtime(self.st_mtime)
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)
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filename = getattr(self, "filename", "?")
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# not all servers support uid/gid
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uid = self.st_uid
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gid = self.st_gid
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size = self.st_size
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if uid is None:
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uid = 0
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if gid is None:
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gid = 0
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if size is None:
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size = 0
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# TODO: not sure this actually worked as expected beforehand, leaving
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# it untouched for the time being, re: .format() upgrade, until someone
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# has time to doublecheck
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return "%s 1 %-8d %-8d %8d %-12s %s" % (
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ks,
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uid,
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gid,
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size,
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datestr,
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filename,
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)
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def asbytes(self):
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return b(str(self))
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