[976] | 1 | # PyKota |
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| 2 | # |
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| 3 | # PyKota - Print Quotas for CUPS and LPRng |
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| 4 | # |
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| 5 | # (c) 2003 Jerome Alet <alet@librelogiciel.com> |
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| 6 | # This program is free software; you can redistribute it and/or modify |
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| 7 | # it under the terms of the GNU General Public License as published by |
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| 8 | # the Free Software Foundation; either version 2 of the License, or |
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| 9 | # (at your option) any later version. |
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| 10 | # |
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| 11 | # This program is distributed in the hope that it will be useful, |
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | # GNU General Public License for more details. |
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| 15 | # |
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| 16 | # You should have received a copy of the GNU General Public License |
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| 17 | # along with this program; if not, write to the Free Software |
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| 18 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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| 19 | # |
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| 20 | # $Id$ |
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| 21 | # |
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| 22 | # $Log$ |
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| 23 | # Revision 1.1 2003/04/30 13:36:40 jalet |
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| 24 | # Stupid accounting method was added. |
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| 25 | # |
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| 26 | # |
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| 27 | # |
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| 28 | |
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| 29 | import sys |
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| 30 | import tempfile |
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| 31 | from pykota.accounter import AccounterBase, PyKotaAccounterError |
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| 32 | |
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| 33 | class Accounter(AccounterBase) : |
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| 34 | def doAccounting(self, printerid, userid) : |
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| 35 | """Does print accounting by stupidly counting the 'showpage' postscript instructions in the document. |
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| 36 | |
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| 37 | This method is essentially unreliable, but shows how to create a simple accounter. |
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| 38 | """ |
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| 39 | # first we log a message because using this accounting method is not recommended. |
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| 40 | self.filter.logger.log_message(_("Using the 'stupid' accounting method is unreliable."), "warn") |
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| 41 | |
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| 42 | # get the job size |
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| 43 | jobsize = self.getJobSize() |
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| 44 | |
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| 45 | # get last job information for this printer |
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| 46 | pgc = self.filter.storage.getPrinterPageCounter(printerid) |
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| 47 | if pgc is None : |
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| 48 | # The printer hasn't been used yet, from PyKota's point of view |
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| 49 | counterbeforejob = 0 |
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| 50 | else : |
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| 51 | # get last job size and page counter from Quota Storage |
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| 52 | # Last lifetime page counter before actual job is |
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| 53 | # last page counter + last job size |
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| 54 | counterbeforejob = pgc["pagecounter"] + pgc["jobsize"] |
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| 55 | |
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| 56 | # Is the current user allowed to print at all ? |
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| 57 | action = self.filter.warnUserPQuota(self.filter.username, self.filter.printername) |
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| 58 | |
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| 59 | # update the quota for the current user on this printer, if allowed to print |
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| 60 | if action == "DENY" : |
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| 61 | jobsize = 0 |
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| 62 | else : |
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| 63 | self.filter.storage.updateUserPQuota(userid, printerid, jobsize) |
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| 64 | |
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| 65 | # adds the current job to history |
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| 66 | self.filter.storage.addJobToHistory(self.filter.jobid, self.filter.storage.getUserId(self.filter.username), printerid, counterbeforejob, action, jobsize) |
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| 67 | |
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| 68 | return action |
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| 69 | |
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| 70 | def getJobSize(self) : |
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| 71 | """Computes the job size and return its value. |
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| 72 | |
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| 73 | THIS METHOD IS COMPLETELY UNRELIABLE BUT SERVES AS AN EXAMPLE. |
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| 74 | """ |
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| 75 | temporary = None |
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| 76 | if self.filter.inputfile is None : |
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| 77 | infile = sys.stdin |
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| 78 | # we will have to duplicate our standard input |
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| 79 | temporary = tempfile.TemporaryFile() |
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| 80 | else : |
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| 81 | infile = open(self.filter.inputfile, "rb") |
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| 82 | |
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| 83 | pagecount = 0 |
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| 84 | for line in infile.xreadlines() : |
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| 85 | if line.startswith("showpage") : |
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| 86 | pagecount += 1 |
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| 87 | if temporary is not None : |
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| 88 | temporary.write(line) |
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| 89 | |
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| 90 | if temporary is not None : |
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| 91 | # this is a copy of our previous standard input |
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| 92 | # flush, then rewind |
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| 93 | temporary.flush() |
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| 94 | temporary.seek(0, 0) |
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| 95 | # our temporary file will be used later if the |
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| 96 | # job is allowed. |
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| 97 | self.filter.inputfile = temporary |
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| 98 | else : |
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| 99 | infile.close() |
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| 100 | |
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| 101 | return pagecount |
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| 102 | |
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