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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
__metaclass__ = type
__all__ = [
'UploadFileSystem',
]
import datetime
import os
import stat
from zope.interface import implements
from zope.security.interfaces import Unauthorized
from zope.server.interfaces.ftp import IFileSystem
class UploadFileSystem:
implements(IFileSystem)
def __init__(self, rootpath):
self.rootpath = rootpath
def _full(self, path):
"""Returns the full path name (i.e. rootpath + path)"""
full_path = os.path.join(self.rootpath, path)
if not os.path.realpath(full_path).startswith(self.rootpath):
raise OSError("Path not allowed:", path)
return full_path
def _sanitize(self, path):
if path.startswith('/'):
path = path[1:]
path = os.path.normpath(path)
return path
def type(self, path):
"""Return the file type at path
The 'type' command returns 'f' for a file, 'd' for a directory and
None if there is no file.
"""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
if os.path.isdir(full_path):
return 'd'
elif os.path.isfile(full_path):
return 'f'
def names(self, path, filter=None):
"""Return a sequence of the names in a directory
If the filter is not None, include only those names for which
the filter returns a true value.
"""
path = self._sanitize(path)
full_path = self._full(path)
if not os.path.exists(full_path):
raise OSError("Not exists:", path)
filenames = os.listdir(os.path.join(self.rootpath, path))
files = []
for filename in filenames:
if not filter or filter(filename):
files.append(filename)
return files
def ls(self, path, filter=None):
"""Return a sequence of information objects.
It considers the names in the given path (returned self.name())
and builds file information using self.lsinfo().
"""
return [self.lsinfo(name) for name in self.names(path, filter)]
def readfile(self, path, outstream, start=0, end=None):
"""Outputs the file at path to a stream.
Not allowed - see filesystem.txt.
"""
raise Unauthorized
def lsinfo(self, path):
"""Return information for a unix-style ls listing for the path
See zope3's interfaces/ftp.py:IFileSystem for details of the
dictionary's content.
"""
path = self._sanitize(path)
full_path = self._full(path)
if not os.path.exists(full_path):
raise OSError("Not exists:", path)
info = {"owner_name": "upload",
"group_name": "upload",
"name": path.split("/")[-1]}
s = os.stat(full_path)
info["owner_readable"] = bool(s.st_mode & stat.S_IRUSR)
info["owner_writable"] = bool(s.st_mode & stat.S_IWUSR)
info["owner_executable"] = bool(s.st_mode & stat.S_IXUSR)
info["group_readable"] = bool(s.st_mode & stat.S_IRGRP)
info["group_writable"] = bool(s.st_mode & stat.S_IWGRP)
info["group_executable"] = bool(s.st_mode & stat.S_IXGRP)
info["other_readable"] = bool(s.st_mode & stat.S_IROTH)
info["other_writable"] = bool(s.st_mode & stat.S_IWOTH)
info["other_executable"] = bool(s.st_mode & stat.S_IXOTH)
info["mtime"] = datetime.datetime.fromtimestamp(self.mtime(path))
info["size"] = self.size(path)
info["type"] = self.type(path)
info["nlinks"] = s.st_nlink
return info
def mtime(self, path):
"""Return the modification time for the file"""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
return os.path.getmtime(full_path)
def size(self, path):
"""Return the size of the file at path"""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
return os.path.getsize(full_path)
def mkdir(self, path):
"""Create a directory."""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
if os.path.isfile(full_path):
raise OSError("File already exists:", path)
elif os.path.isdir(full_path):
raise OSError("Directory already exists:", path)
raise OSError("OOPS, can't create:", path)
else:
old_mask = os.umask(0)
try:
os.makedirs(full_path, 0775)
finally:
os.umask(old_mask)
def remove(self, path):
"""Remove a file."""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
if os.path.isfile(full_path):
os.unlink(full_path)
elif os.path.isdir(full_path):
raise OSError("Is a directory:", path)
else:
raise OSError("Not exists:", path)
def rmdir(self, path):
"""Remove a directory.
Remove a target path recursively.
"""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
os.rmdir(full_path)
else:
raise OSError("Not exists:", path)
def rename(self, old, new):
"""Rename a file."""
old = self._sanitize(old)
new = self._sanitize(new)
full_old = self._full(old)
full_new = self._full(new)
if os.path.isdir(full_new):
raise OSError("Is a directory:", new)
if os.path.exists(full_old):
if os.path.isfile(full_old):
os.rename(full_old, full_new)
elif os.path.isdir(full_old):
raise OSError("Is a directory:", old)
else:
raise OSError("Not exists:", old)
def writefile(self, path, instream, start=None, end=None, append=False):
"""Write data to a file.
See zope3's interfaces/ftp.py:IFileSystem for details of the
handling of the various arguments.
"""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
if os.path.isdir(full_path):
raise OSError("Is a directory:", path)
else:
dirname = os.path.dirname(full_path)
if dirname:
if not os.path.exists(dirname):
old_mask = os.umask(0)
try:
os.makedirs(dirname, 0775)
finally:
os.umask(old_mask)
if start and start < 0:
raise ValueError("Negative start argument:", start)
if end and end < 0:
raise ValueError("Negative end argument:", end)
if start and end and end <= start:
return
if append:
open_flag = 'a'
elif start or end:
open_flag = "r+"
if not os.path.exists(full_path):
open(full_path, 'w')
else:
open_flag = 'w'
outstream = open(full_path, open_flag)
if start:
outstream.seek(start)
chunk = instream.read()
while chunk:
outstream.write(chunk)
chunk = instream.read()
if not end:
outstream.truncate()
instream.close()
outstream.close()
def writable(self, path):
"""Return boolean indicating whether a file at path is writable."""
path = self._sanitize(path)
full_path = self._full(path)
if os.path.exists(full_path):
if os.path.isfile(full_path):
return True
elif os.path.isdir(full_path):
return False
else:
return True
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