Is it possible to hide some files ?

[Yannis B]

Hello,

In OS X, I would like to hide the "Icon" file names when I'm browsing
the shared directory and the subs.

Congratulations for the 0.6 version.

Bye

[Giampaolo Rodolà]

Hi,

you can override AbstractedFS.listdir method. 
In there, you can return a filtered list of file names.

...something like:

from pyftpdlib import ftpserver

class CustomizedFS(ftpserver.AbstractedFS):

    def listdir(self, path):

        ls = os.listdir(path)

        return [x for x in ls if not x.endswith('.ico')]

authorizer = ftpserver.DummyAuthorizer()

authorizer.add_anonymous(os.getcwd())

handler = ftpserver.FTPHandler

handler.authorizer = authorizer

handler.abstracted_fs = CustomizedFS

server = ftpserver.FTPServer(('', 21), handler)

server.serve_forever()

Hope this helps,

Giampaolo

[Yannis B]

Thanks, it's working great.

Do you confirm that a "hidden" files cannot be downloaded by the
client even if he knows that it really exists and does a RETR command?

[Giampaolo Rodolà]

No, i do not confirm. =)
Of course it can. 

listdir() method dictates what the FTP server returns on LIST, while RETR is governed by AbstractedFS.open() method.

In order to filter client downloads you should override open() method as well, keeping in mind that in case of RETR, open is called with mode="r" argument.

So, let's say you want to deny the download of files with .ico extension, you would end up doing something like this:

class CustomizedFS(ftpserver.AbstractedFS):

    def listdir(self, path):

        ls = os.listdir(path)

        return [x for x in ls if not x.endswith('.ico')]

     def open(self, path, mode):

          if "r" in mode and path.endswith(.'ico'):

              # ENOENT is "no such file or directory";

              raise OSError(errno.ENOENT)

          return open(path, mode)

Hope this helps,

G.

[Yannis B]

OK, I tested the code, but I realized that the

raise OSError(errno.ENOENT)

gave me a traceback. Not nice.
Instead, I put

return open('//', 'r')


but it does not give the right message in the 550 code.
I then tried

return open('//somethingelse', 'r')

giving me the right message, but that's not nice, if the file
'seomethingelse' exists !

I'm sure there is a right way to do that, but I'm not a programmer at
all

[Giampaolo Rodolà]

2011/10/2 Yannis B <lapostem...@gmail.com>

OK, I tested the code, but I realized that the

                raise OSError(errno.ENOENT)

gave me a traceback. Not nice.

What traceback?
Maybe you didn't import errno module.

Add:

import errno

...at the top of the file.

G.

[Yannis B]

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/asyncore.py", line 83, in read
obj.handle_read_event()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/asyncore.py", line 442, in handle_read_event
self.handle_read()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/asynchat.py", line 158, in handle_read
self.found_terminator()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 1996, in
found_terminator
self.process_command(cmd, arg)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 2005, in
process_command
method(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 2643, in
ftp_RETR
fd = self.run_as_current_user(self.fs.open, file, 'rb')
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 2253, in
run_as_current_user
return function(*args, **kwargs)
File "../ftptest.py", line 14, in open
raise OSError(errno.ENOENT)
OSError: 2



obtained with the ftptest.py file :

import os
import errno
from pyftpdlib import ftpserver

class CustomizedFS(ftpserver.AbstractedFS):

def listdir(self, path):
ls = os.listdir(path)

return [x for x in ls if not x.endswith('.zip')]


def open(self, path, mode):
if "r" in mode and path.endswith('.zip'):

raise OSError(errno.ENOENT)
return open(path, mode)

authorizer = ftpserver.DummyAuthorizer()
authorizer.add_anonymous(os.getcwd())
handler = ftpserver.FTPHandler
handler.authorizer = authorizer
handler.abstracted_fs = CustomizedFS

server = ftpserver.FTPServer(('192.168.1.2', 2121), handler)
server.serve_forever()

[Giampaolo Rodolà]

Oh, right, sorry.

Do:

raise IOError(errno.ENOENT)

...instead of:

 raise OSError(errno.ENOENT)

G.

2011/10/2 Yannis B <lapostem...@gmail.com>

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[Yannis B]

mmmm

getting another traceback

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/asyncore.py", line 83, in read
obj.handle_read_event()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/asyncore.py", line 442, in handle_read_event
self.handle_read()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/asynchat.py", line 158, in handle_read
self.found_terminator()
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 1996, in
found_terminator
self.process_command(cmd, arg)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 2005, in
process_command
method(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/

python2.7/site-packages/pyftpdlib/ftpserver.py", line 2645, in
ftp_RETR
why = _strerror(err)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/
python2.7/site-packages/pyftpdlib/ftpserver.py", line 212, in
_strerror
return os.strerror(err.errno)
TypeError: an integer is required