root / pykota / trunk / bin / pykota @ 1205

#! /usr/bin/env python
# -*- coding: ISO-8859-15 -*-

# PyKota accounting filter
#
# PyKota - Print Quotas for CUPS and LPRng
#
# (c) 2003 Jerome Alet <alet@librelogiciel.com>
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
# $Id$
#
# $Log$
# Revision 1.46  2003/11/24 14:25:02  jalet
# Missing import in pykota filter
#
# Revision 1.45  2003/11/19 23:19:37  jalet
# Code refactoring work.
# Explicit redirection to /dev/null has to be set in external policy now, just
# like in external mailto.
#
# Revision 1.44  2003/11/08 16:05:31  jalet
# CUPS backend added for people to experiment.
#
# Revision 1.43  2003/11/06 22:33:25  jalet
# French variable name
#
# Revision 1.42  2003/10/08 21:41:38  jalet
# External policies for printers works !
# We can now auto-add users on first print, and do other useful things if needed.
#
# Revision 1.41  2003/10/07 09:07:27  jalet
# Character encoding added to please latest version of Python
#
# Revision 1.40  2003/09/04 08:38:56  jalet
# Added an exception catch to ensure clean close of database even in
# case of TypeError too.
#
# Revision 1.39  2003/08/18 16:35:28  jalet
# New pychecker pass, on the tools this time.
#
# Revision 1.38  2003/08/18 16:20:59  jalet
# Improvement of the printing system detection code.
#
# Revision 1.37  2003/07/29 20:55:17  jalet
# 1.14 is out !
#
# Revision 1.36  2003/07/10 06:09:52  jalet
# Incorrect documentation string
#
# Revision 1.35  2003/06/25 14:10:01  jalet
# Hey, it may work (edpykota --reset excepted) !
#
# Revision 1.34  2003/06/13 18:54:17  jalet
# Bug with remote jobs and LPRng fixed.
#
# Revision 1.33  2003/05/28 13:51:38  jalet
# Better handling of errors
#
# Revision 1.32  2003/05/27 23:00:20  jalet
# Big rewrite of external accounting methods.
# Should work well now.
#
# Revision 1.31  2003/04/30 13:36:39  jalet
# Stupid accounting method was added.
#
# Revision 1.30  2003/04/29 22:03:38  jalet
# Better error handling.
#
# Revision 1.29  2003/04/29 18:37:54  jalet
# Pluggable accounting methods (actually doesn't support external scripts)
#
# Revision 1.28  2003/04/26 08:41:24  jalet
# Small code reorganisation (UNTESTED) to allow pluggable accounting
# methods in the future.
#
# Revision 1.27  2003/04/25 09:23:47  jalet
# Debug message passed through !
#
# Revision 1.26  2003/04/25 08:23:23  jalet
# Multiple tries to get the printer's internal page counter, waits for
# one minute maximum for the printer to warm up, actually.
#
# Revision 1.25  2003/04/24 11:53:48  jalet
# Default policy for unknown users/groups is to DENY printing instead
# of the previous default to ALLOW printing. This is to solve an accuracy
# problem. If you set the policy to ALLOW, jobs printed by in nexistant user
# (from PyKota's POV) will be charged to the next user who prints on the
# same printer.
#
# Revision 1.24  2003/04/23 22:13:56  jalet
# Preliminary support for LPRng added BUT STILL UNTESTED.
#
# Revision 1.23  2003/04/15 11:30:57  jalet
# More work done on money print charging.
# Minor bugs corrected.
# All tools now access to the storage as priviledged users, repykota excepted.
#
# Revision 1.22  2003/04/15 11:09:04  jalet
# Small bug was fixed when a printer was never used and its internal
# page counter is not accessible.
#
# Revision 1.21  2003/04/12 17:20:14  jalet
# Better formula for HP workaround
#
# Revision 1.20  2003/04/12 16:58:28  jalet
# The workaround for HP printers was not correct, and there's probably no
# correct way to workaround the problem because we can't save the internal
# page counter in real time. The last job's size is unconditionnally set to
# 5 pages in this case.
#
# Revision 1.19  2003/04/11 08:56:49  jalet
# Comment
#
# Revision 1.18  2003/04/11 08:50:39  jalet
# Workaround for the HP "feature" of saving the page counter to NVRAM
# only every time 10 new pages are printed...
# Workaround for printers with volatile page counters.
#
# Revision 1.17  2003/04/10 21:47:20  jalet
# Job history added. Upgrade script neutralized for now !
#
# Revision 1.16  2003/04/08 20:38:08  jalet
# The last job Id is saved now for each printer, this will probably
# allow other accounting methods in the future.
#
# Revision 1.15  2003/03/29 13:45:27  jalet
# GPL paragraphs were incorrectly (from memory) copied into the sources.
# Two README files were added.
# Upgrade script for PostgreSQL pre 1.01 schema was added.
#
# Revision 1.14  2003/03/07 22:16:57  jalet
# Algorithmically incorrect : last user quota wasn't updated if current
# user wasn't allowed to print.
#
# Revision 1.13  2003/02/27 23:59:28  jalet
# Stupid bug wrt exception handlingand value conversion
#
# Revision 1.12  2003/02/27 23:48:41  jalet
# Correctly maps PyKota's log levels to syslog log levels
#
# Revision 1.11  2003/02/27 22:55:20  jalet
# WARN log priority doesn't exist.
#
# Revision 1.10  2003/02/27 22:43:21  jalet
# Missing import
#
# Revision 1.9  2003/02/27 22:40:26  jalet
# Correctly handles cases where the printer is off.
#
# Revision 1.8  2003/02/09 12:56:53  jalet
# Internationalization begins...
#
# Revision 1.7  2003/02/07 10:23:48  jalet
# Avoid a possible future name clash
#
# Revision 1.6  2003/02/06 22:54:33  jalet
# warnpykota should be ok
#
# Revision 1.5  2003/02/05 22:45:25  jalet
# Forgotten import
#
# Revision 1.4  2003/02/05 22:42:51  jalet
# Typo
#
# Revision 1.3  2003/02/05 22:38:39  jalet
# Typo
#
# Revision 1.2  2003/02/05 22:16:20  jalet
# DEVICE_URI is undefined outside of CUPS, i.e. for normal command line tools
#
# Revision 1.1  2003/02/05 21:28:17  jalet
# Initial import into CVS
#
#
#

import sys
import os

from pykota.tool import PyKotaFilterOrBackend, PyKotaToolError
from pykota.config import PyKotaConfigError
from pykota.storage import PyKotaStorageError
from pykota.accounter import PyKotaAccounterError
from pykota.requester import PyKotaRequesterError

class PyKotaFilter(PyKotaFilterOrBackend) :        
    """A class for the pykota filter."""
    def acceptJob(self) :        
        """Returns the exit code needed by the printing backend to accept the job and print it."""
        if self.printingsystem == "CUPS" :
            return 0
        elif self.printingsystem == "LPRNG" :    
            return 0
        else :    
            # UNKNOWN
            return -1
            
    def removeJob(self) :            
        """Returns the exit code needed by the printing backend to refuse the job and remove it."""
        if self.printingsystem == "CUPS" :
            return 1
        elif self.printingsystem == "LPRNG" :    
            return 3
        else :    
            # UNKNOWN
            return -1
            
def main(thefilter) :    
    """Do it, and do it right !"""
    #
    # If this is a CUPS filter, we should act and die like a CUPS filter when needed
    if thefilter.printingsystem == "CUPS" :
        if len(sys.argv) not in (6, 7) :    
            sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0])
            return thefilter.removeJob()
    
    # Get the last page counter and last username from the Quota Storage backend
    printer = thefilter.storage.getPrinter(thefilter.printername)
    if not printer.Exists :
        # The printer is unknown from the Quota Storage perspective
        # we let the job pass through, but log a warning message
        thefilter.logger.log_message(_("Printer %s not registered in the PyKota system") % thefilter.printername, "warn")
    else :    
        for dummy in range(2) :
            user = thefilter.storage.getUser(thefilter.username)
            if user.Exists :
                break
            else :    
                # The user is unknown from the Quota Storage perspective
                # Depending on the default policy for this printer, we
                # either let the job pass through or reject it, but we
                # log a message in any case.
                (policy, args) = thefilter.config.getPrinterPolicy(thefilter.printername)
                if policy == "ALLOW" :
                    action = "POLICY_ALLOW"
                elif policy == "EXTERNAL" :    
                    commandline = thefilter.formatCommandLine(args, user, printer)
                    thefilter.logger.log_message(_("User %s not registered in the PyKota system, applying external policy (%s) for printer %s") % (thefilter.username, commandline, thefilter.printername), "info")
                    if os.system(commandline) :
                        thefilter.logger.log_message(_("External policy %s for printer %s produced an error. Job rejected. Please check PyKota's configuration files.") % (commandline, thefilter.printername), "error")
                        return thefilter.removeJob()
                    else :    
                        # here we try a second time, because the goal
                        # of the external action was to add the user
                        # in the database.
                        continue 
                else :    
                    action = "POLICY_DENY"
                thefilter.logger.log_message(_("User %s not registered in the PyKota system, applying default policy (%s) for printer %s") % (thefilter.username, action, thefilter.printername), "warn")
                if action == "POLICY_DENY" :
                    return thefilter.removeJob()
                # when we get there, the printer policy allows the job to pass 
                break    
                    
        # if user exists, do accounting
        if user.Exists :
            # Now does the accounting and act depending on the result
            action = thefilter.accounter.doAccounting(printer, user)
        
            # if not allowed to print then die, else proceed.
            if action == "DENY" :
                # No, just die cleanly
                return thefilter.removeJob()
        elif policy == "EXTERNAL" :                
            thefilter.logger.log_message(_("External policy %s for printer %s couldn't add user %s. Job rejected.") % (commandline, thefilter.printername, thefilter.username), "error")
            return thefilter.removeJob()
        
    # pass the job untouched to the underlying layer
    thefilter.accounter.filterInput(thefilter.inputfile)      
    
    return thefilter.acceptJob()

if __name__ == "__main__" :    
    retcode = -1
    try :
        # Initializes the current tool
        kotafilter = PyKotaFilter()    
        retcode = main(kotafilter)
    except (PyKotaToolError, PyKotaConfigError, PyKotaStorageError, PyKotaAccounterError, PyKotaRequesterError, AttributeError, KeyError, IndexError, ValueError, TypeError, IOError), msg :
        sys.stderr.write("ERROR : PyKota filter failed (%s)\n" % msg)
        sys.stderr.flush()
        try :
            retcode = kotafilter.removeJob()
        except :
            retcode = -1

    try :
        kotafilter.storage.close()
    except (TypeError, NameError, AttributeError) :    
        pass
        
    sys.exit(retcode)