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

# PyKota accounting filter
#
# PyKota - Print Quotas for CUPS and LPRng
#
# (c) 2003-2004 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 1.59  2004/05/21 21:02:56  jalet
# The pykota filter is now deprecated
#
# Revision 1.58  2004/05/18 14:48:47  jalet
# Big code changes to completely remove the need for "requester" directives,
# jsut use "hardware(... your previous requester directive's content ...)"
#
# Revision 1.57  2004/03/15 10:47:56  jalet
# This time the traceback formatting should be correct !
#
# Revision 1.56  2004/03/05 12:46:08  jalet
# Improve tracebacks
#
# Revision 1.55  2004/03/05 12:31:35  jalet
# Now should output full traceback when crashing
#
# Revision 1.54  2004/03/01 15:06:51  jalet
# Pre and Post hooks should now work in the pykota filter too.
# The pykota filter doesn't check the last user's quota anymore
# when delayed hardware accounting is used : this will be checked
# anyway the next time the last user will print
#
# Revision 1.53  2004/02/25 12:36:34  jalet
# Avoids a database query even if caching was disabled.
#
# Revision 1.52  2004/01/14 15:57:54  jalet
# Missing return caused problems with LPRng
#
# Revision 1.51  2004/01/12 18:20:45  jalet
# Denied jobs weren't added to the history anymore, this is now fixed.
#
# Revision 1.50  2004/01/11 23:22:42  jalet
# Major code refactoring, it's way cleaner, and now allows automated addition
# of printers on first print.
#
# Revision 1.49  2004/01/08 14:10:32  jalet
# Copyright year changed.
#
# Revision 1.48  2003/12/27 16:49:25  uid67467
# Should be ok now.
#
# Revision 1.47  2003/11/26 19:17:35  jalet
# Printing on a printer not present in the Quota Storage now results
# in the job being stopped or cancelled depending on the system.
#
# 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

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 doWork(self, policy, printer, user, userpquota) :    
        """Most of the work is done here."""
        # Two different values possible for policy here :
        # ALLOW means : Either printer, user or user print quota doesn't exist,
        #               but the job should be allowed anyway.
        # OK means : Both printer, user and user print quota exist, job should
        #            be allowed if current user is allowed to print on this printer
        if policy == "OK" :
            # exports user information with initial values
            self.exportUserInfo(userpquota)
            
            # enters first phase
            os.putenv("PYKOTAPHASE", "BEFORE")
            
            self.logdebug("Does accounting for user %s on printer %s." % (user.Name, printer.Name))
            action = self.accounter.doAccounting(userpquota)
            
            # exports some new environment variables
            os.putenv("PYKOTAACTION", action)
            
            # launches the pre hook
            self.prehook(userpquota)
        else :        
            action = "ALLOW"
            
        # pass the job's data to the next filter
        if action in ["ALLOW", "WARN"] :
            self.logdebug("Passing input data to next filter.")
            mustclose = 0    
            if self.inputfile is not None :    
                if hasattr(self.inputfile, "read") :
                    infile = self.inputfile
                else :    
                    infile = open(self.inputfile, "rb")
                mustclose = 1
            else :    
                infile = sys.stdin
            data = infile.read(256*1024)    
            while data :
                sys.stdout.write(data)
                data = infile.read(256*1024)
            if mustclose :    
                infile.close()
            return self.acceptJob()
        else :
            self.logdebug("Printing is denied.")
            return self.removeJob()
        
    def mainWork(self) :    
        # If this is a CUPS filter, we should act and die like a CUPS filter when needed
        if self.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 self.removeJob()
                
        if self.accounter.isDelayed :        
            # Here we need to update the last user's print quota        
            # because hardware accounting is delayed by one print job
            # in the pykota filter.
            printer = self.storage.getPrinter(self.printername)        
            if not printer.Exists :
                self.logger.log_message(_("Printer %s not registered in the PyKota system") % self.printername, "info")
            else :    
                if not printer.LastJob.Exists :
                    self.logger.log_message(_("Printer %s was never used") % self.printername, "info")
                else :
                    self.logdebug("Updating print quota for last user %s on printer %s" % (printer.LastJob.User.Name, printer.Name))
                    lastuserpquota = self.storage.getUserPQuota(printer.LastJob.User, printer)
                    self.accounter.counterbefore = printer.LastJob.PrinterPageCounter
                    self.accounter.counterafter = self.accounter.getPrinterInternalPageCounter() or 0
                    lastjobsize = self.accounter.getJobSize()
                    self.logdebug("Last Job size : %i" % lastjobsize)
                    lastjobprice = printer.LastJob.setSize(lastuserpquota, lastjobsize)
                    self.logdebug("Updating user %s's quota on printer %s" % (lastuserpquota.User.Name, printer.Name))
                    lastuserpquota.increasePagesUsage(lastjobsize)
                    
                    # exports user information with final values
                    self.exportUserInfo(lastuserpquota)
                    
                    # enters final phase
                    os.putenv("PYKOTAPHASE", "AFTER")
                    os.putenv("PYKOTAACTION", printer.LastJob.JobAction)
                    os.putenv("PYKOTAJOBSIZE", str(lastjobsize))
                    os.putenv("PYKOTAJOBPRICE", str(lastjobprice))
                    
                    # launches the post hook
                    self.posthook(lastuserpquota)
                    
                    # Code below deactivated since this will be checked
                    # anyway the next time this user prints 
                    # finally check last user's quota
                    # self.warnUserPQuota(lastuserpquota)
                    
        # then deal with current print job as usual            
        return PyKotaFilterOrBackend.mainWork(self)        
            
if __name__ == "__main__" :    
    sys.stderr.write("ERROR : pykota is now deprecated. With CUPS use cupspykota instead.\n")
    sys.stderr.write("ERROR : pykota is now deprecated. With LPRng please wait for a new version.\n")
    sys.stderr.flush()
    sys.exit(-1)
    
    ##############
    #            #
    # DEPRECATED #
    #            #
    ##############
    retcode = -1
    try :
        # Initializes the current tool
        kotafilter = PyKotaFilter()    
        retcode = kotafilter.mainWork()
    except (PyKotaToolError, PyKotaConfigError, PyKotaStorageError, PyKotaAccounterError, AttributeError, KeyError, IndexError, ValueError, TypeError, IOError), msg :
        import traceback
        mm = [((f.endswith('\n') and f) or (f + '\n')) for f in traceback.format_exception(*sys.exc_info())]
        sys.stderr.write("ERROR : pykota filter failed (%s)\n%s" % (msg, "ERROR : ".join(mm)))
        sys.stderr.flush()
        try :
            retcode = kotafilter.removeJob()
        except :
            retcode = -1

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