Re: [pyftpdlib-users] delete user on the fly

[Giampaolo Rodola']

You're using two separate instances of the DummyAuthorizer class.
In fact you instantiate it again in deleteServer() method.

What you have to do instead is keep a reference of the first "authorizer" instance around and invoke remove_user() against that object. 

On Wed, Mar 29, 2017 at 7:25 PM, wichtel <helle...@gmail.com> wrote:

How to delete a user "on the fly", meaning when the server itself is running?

Here's my code at the moment:

Inside my main.py I created a local FTP server using this lib.

Then I create a new folder named modules with a class called GameServer. Inside this class gameserver I defined a method (static) to deleteFTPAccess(username). How to call this method now using the FTP server defined inside the main.py?

My structure of files:

    main.py

       modules

         gameserver.py

gameserver.py

    from pyftpdlib.authorizers import DummyAuthorizer
    from pyftpdlib.handlers import FTPHandler
    from pyftpdlib.servers import FTPServer


    class GameServer ():


        def __init__(self, id, ip_address, port):
            self.id             = id
            self.ip_address     = ip_address
            self.port           = port


        @staticmethod
        def deleteServer(id):
            #delete FTP access
            authorizer = DummyAuthorizer()
            authorizer.remove_user(id)

main.py

    from pyftpdlib.authorizers import DummyAuthorizer
    from pyftpdlib.handlers import FTPHandler
    from pyftpdlib.servers import FTPServer
    from modules.gameserver import GameServer


    authorizer = DummyAuthorizer()
    authorizer.add_user("user", "12345", "/home", perm="elradfmw")
    handler = FTPHandler
    handler.authorizer = authorizer
    server = FTPServer(("127.0.0.1", 21), handler)
    server.serve_forever()


    GameServer.deleteServer("user")

When deleting a server it doesn't effect the FTP, meaning I can access the server using the username after deleting. From my point of view, the usage is wrong.

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[wichtel]

Thanks Giampaolo for your quick answer. I'm new to python, sorry for this, but how can I access this from inside my method?

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[Giampaolo Rodola']

You declare the authorized in main.py right?

    authorizer = DummyAuthorizer()

All you have to do is to keep it or pass it around so that you can access it.

Judging from the code you pasted you don't need gameserver.py. I'd just keep everything in main.py.

You may want to either:

a) define the "authorizer" object globally, outside of the main() function

b) define it in the main() function and use "global" keyword to make it globally accessible

c) keep it "local" to main() function and pass it to some other class or function as an argument

Point is: just operate on that authorizer and don't instantiate a new one. 

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[wichtel]

I don't want to waste your time, but I used this code inside my main.py

global authorizer

authorizer = DummyAuthorizer()

and this code is as my delete method inside GameServer class

@staticmethod
def deleteServer(id):
 #delete FTP access

 authorizer.remove_user(id)

User is still now removed and when exiting the running code using CTRL + C it says:

NameError: global name 'authorizer' is not defined

[Giampaolo Rodola']

Paste the whole code please.

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[wichtel]

My Gameserver.py

 class GameServer ():


    def __init__(self, id, ip_address, port, slots, tickrate = 64):

        self.id             = id
        self.ip_address     = ip_address
        self.port           =

port
        self.slots          = slots
        self.tickrate       = tickrate


    @staticmethod

    def deleteServer(id):
        #delete FTP access
        authorizer.remove_user(id)

My main (whole code)

#import ConfigParser
#from database_connection import *

from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer
from modules.gameserver import GameServer

global authorizer

authorizer = DummyAuthorizer()

authorizer.add_user("user", "12345", "/home", perm="elradfmw")
handler = FTPHandler
handler.authorizer = authorizer
server = FTPServer(("127.0.0.1", 21), handler)
server.serve_forever()


GameServer.deleteServer("user")

All the best;

[wichtel]

@Giampaolo Rodola

Is there some way to add/remove users on runtime, if yes can you show me a small example or did I need to stop server, update the handler with new users (excluding the user I want to delete) and then restart the server?

[Giampaolo Rodola']

As I said, you have to operate on the same "authorizer" object.

In order to add and remove users you already have add_user() and remove_user() methods.

Just get rid of the two separate files, put all your code in main.py and keep the authorizer object around (make it global).

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[wichtel]

Here's my full source code at the moment:

main.py

from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler

from pyftpdlib.servers import MultiprocessFTPServer
from modules.gameserver import Gameserver

def main():

    print("hallo1")
    authorizer = DummyAuthorizer()
    authorizer.add_user('user', '12345', '.')

    handler = FTPHandler
    handler.authorizer =

 authorizer
    server = MultiprocessFTPServer(('', 2121), handler)
    server.serve_forever()
    print("hallo")
    server.close_all()

    Gameserver.deleteServer(server, authorizer, "user")

if __name__ == "__main__":
    main()

gameserver.py

class Gameserver ():

    def __init__(self, id, ip_address, port, slots, tickrate = 64):
        self.id             = id
        self.ip_address     = ip_address
        self.port           = port
        self.slots          = slots
        self.tickrate       = tickrate

    @staticmethod
    def deleteServer (server, authorizer, name ):
        authorizer.remove_user(name)

How would I need to "assign" the authorizer object inside my deleteServer method now to the running server?

-I'm running the server multithreaded, so I can execute code while server is running.

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