| 1 | #! /usr/bin/env python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | |
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| 4 | # CupsOfTee : Tee for CUPS |
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| 5 | # |
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| 6 | # (c) 2005 Jerome Alet <alet@librelogiciel.com> |
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| 7 | # This program is free software; you can redistribute it and/or modify |
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| 8 | # it under the terms of the GNU General Public License as published by |
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| 9 | # the Free Software Foundation; either version 2 of the License, or |
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| 10 | # (at your option) any later version. |
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| 11 | # |
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| 12 | # This program is distributed in the hope that it will be useful, |
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | # GNU General Public License for more details. |
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| 16 | # |
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| 17 | # You should have received a copy of the GNU General Public License |
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| 18 | # along with this program; if not, write to the Free Software |
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| 19 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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| 20 | # |
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| 21 | # $Id$ |
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| 22 | # |
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| 23 | # |
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| 24 | |
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| 25 | import sys |
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| 26 | import os |
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| 27 | import errno |
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| 28 | import cStringIO |
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| 29 | import shlex |
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| 30 | import tempfile |
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| 31 | import ConfigParser |
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| 32 | |
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| 33 | class TeeError(Exception): |
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| 34 | """Base exception for CupsOfTee related stuff.""" |
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| 35 | def __init__(self, message = ""): |
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| 36 | self.message = message |
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| 37 | Exception.__init__(self, message) |
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| 38 | def __repr__(self): |
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| 39 | return self.message |
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| 40 | __str__ = __repr__ |
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| 41 | |
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| 42 | class ConfigError(TeeError) : |
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| 43 | """Configuration related exceptions.""" |
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| 44 | pass |
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| 45 | |
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| 46 | class FakeConfig : |
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| 47 | """Fakes a configuration file parser.""" |
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| 48 | def get(self, section, option, raw=0) : |
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| 49 | """Fakes the retrieval of a global option.""" |
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| 50 | raise ConfigError, "Invalid configuration file : no option %s in section [%s]" % (option, section) |
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| 51 | |
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| 52 | class CupsBackend : |
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| 53 | """Base class for tools with no database access.""" |
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| 54 | def __init__(self) : |
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| 55 | """Initializes the CUPS backend wrapper.""" |
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| 56 | confdir = os.environ.get("CUPS_SERVERROOT", ".") |
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| 57 | self.conffile = os.path.join(confdir, "cupsoftee.conf") |
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| 58 | if os.path.isfile(self.conffile) : |
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| 59 | self.config = ConfigParser.ConfigParser() |
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| 60 | self.config.read([self.conffile]) |
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| 61 | self.debug = self.isTrue(getGlobalOption("debug", ignore=1)) |
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| 62 | else : |
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| 63 | self.config = FakeConfig() |
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| 64 | self.debug = 1 # no config, so force debug mode ! |
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| 65 | |
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| 66 | def isTrue(self, option) : |
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| 67 | """Returns 1 if option is set to true, else 0.""" |
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| 68 | if (option is not None) and (option.upper().strip() in ['Y', 'YES', '1', 'ON', 'T', 'TRUE']) : |
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| 69 | return 1 |
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| 70 | else : |
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| 71 | return 0 |
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| 72 | |
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| 73 | def getGlobalOption(self, option, ignore=0) : |
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| 74 | """Returns an option from the global section, or raises a ConfigError if ignore is not set, else returns None.""" |
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| 75 | try : |
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| 76 | return self.config.get("global", option, raw=1) |
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| 77 | except (ConfigParser.NoSectionError, ConfigParser.NoOptionError) : |
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| 78 | if ignore : |
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| 79 | return |
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| 80 | else : |
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| 81 | raise ConfigError, "Option %s not found in section global of %s" % (option, self.conffile) |
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| 82 | |
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| 83 | def getPrinterOption(self, sectionname, option) : |
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| 84 | """Returns an option from the printer section, or the global section, or raises a ConfigError.""" |
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| 85 | globaloption = self.getGlobalOption(option, ignore=1) |
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| 86 | try : |
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| 87 | return self.config.get(sectionname, option, raw=1) |
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| 88 | except (ConfigParser.NoSectionError, ConfigParser.NoOptionError) : |
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| 89 | if globaloption is not None : |
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| 90 | return globaloption |
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| 91 | else : |
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| 92 | raise ConfigError, "Option %s not found in section [%s] of %s" % (option, sectionname, self.conffile) |
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| 93 | |
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| 94 | def discoverOtherBackends(self) : |
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| 95 | """Discovers the other CUPS backends. |
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| 96 | |
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| 97 | Executes each existing backend in turn in device enumeration mode. |
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| 98 | Returns the list of available backends. |
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| 99 | """ |
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| 100 | # Unfortunately this method can't output any debug information |
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| 101 | # to stdout or stderr, else CUPS considers that the device is |
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| 102 | # not available. |
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| 103 | available = [] |
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| 104 | (directory, myname) = os.path.split(sys.argv[0]) |
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| 105 | tmpdir = tempfile.gettempdir() |
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| 106 | lockfilename = os.path.join(tmpdir, "%s..LCK" % myname) |
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| 107 | if os.path.exists(lockfilename) : |
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| 108 | lockfile = open(lockfilename, "r") |
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| 109 | pid = int(lockfile.read()) |
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| 110 | lockfile.close() |
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| 111 | try : |
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| 112 | # see if the pid contained in the lock file is still running |
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| 113 | os.kill(pid, 0) |
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| 114 | except OSError, e : |
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| 115 | if e.errno != errno.EPERM : |
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| 116 | # process doesn't exist anymore |
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| 117 | os.remove(lockfilename) |
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| 118 | |
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| 119 | if not os.path.exists(lockfilename) : |
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| 120 | lockfile = open(lockfilename, "w") |
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| 121 | lockfile.write("%i" % os.getpid()) |
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| 122 | lockfile.close() |
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| 123 | allbackends = [ os.path.join(directory, b) \ |
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| 124 | for b in os.listdir(directory) |
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| 125 | if os.access(os.path.join(directory, b), os.X_OK) \ |
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| 126 | and (b != myname)] |
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| 127 | for backend in allbackends : |
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| 128 | answer = os.popen(backend, "r") |
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| 129 | try : |
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| 130 | devices = [line.strip() for line in answer.readlines()] |
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| 131 | except : |
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| 132 | devices = [] |
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| 133 | status = answer.close() |
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| 134 | if status is None : |
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| 135 | for d in devices : |
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| 136 | # each line is of the form : |
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| 137 | # 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
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| 138 | # so we have to decompose it carefully |
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| 139 | fdevice = cStringIO.StringIO(d) |
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| 140 | tokenizer = shlex.shlex(fdevice) |
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| 141 | tokenizer.wordchars = tokenizer.wordchars + \ |
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| 142 | r".:,?!~/\_$*-+={}[]()#" |
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| 143 | arguments = [] |
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| 144 | while 1 : |
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| 145 | token = tokenizer.get_token() |
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| 146 | if token : |
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| 147 | arguments.append(token) |
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| 148 | else : |
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| 149 | break |
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| 150 | fdevice.close() |
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| 151 | try : |
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| 152 | (devicetype, device, name, fullname) = arguments |
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| 153 | except ValueError : |
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| 154 | pass # ignore this 'bizarre' device |
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| 155 | else : |
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| 156 | if name.startswith('"') and name.endswith('"') : |
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| 157 | name = name[1:-1] |
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| 158 | if fullname.startswith('"') and fullname.endswith('"') : |
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| 159 | fullname = fullname[1:-1] |
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| 160 | available.append('%s cupsoftee:%s "CupsOfTee+%s" "CupsOfTee managed %s"' \ |
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| 161 | % (devicetype, device, name, fullname)) |
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| 162 | os.remove(lockfilename) |
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| 163 | return available |
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| 164 | |
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| 165 | def fakePrint(self) : |
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| 166 | """Fakes to print the job.""" |
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| 167 | if os.environ.has_key("CUPS_SERVERROOT") and os.path.isdir(os.environ.get("CUPS_SERVERROOT", "")) : |
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| 168 | # Either the job's datas are on our stdin, or in a file |
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| 169 | if len(sys.argv) == 7 : |
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| 170 | self.InputFile = sys.argv[6] |
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| 171 | else : |
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| 172 | self.InputFile = None |
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| 173 | |
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| 174 | # check that the DEVICE_URI environment variable's value is |
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| 175 | # prefixed with "cupsoftee:" otherwise don't touch it. |
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| 176 | # If this is the case, we have to remove the prefix from |
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| 177 | # the environment before launching the real backend in cupspykota |
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| 178 | device_uri = os.environ.get("DEVICE_URI", "") |
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| 179 | if device_uri.startswith("cupspykota:") : |
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| 180 | fulldevice_uri = device_uri[:] |
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| 181 | device_uri = fulldevice_uri[len("cupspykota:"):] |
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| 182 | if device_uri.startswith("//") : # lpd (at least) |
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| 183 | device_uri = device_uri[2:] |
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| 184 | os.environ["DEVICE_URI"] = device_uri # TODO : side effect ! |
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| 185 | # TODO : check this for more complex urls than ipp://myprinter.dot.com:631/printers/lp |
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| 186 | try : |
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| 187 | (backend, destination) = device_uri.split(":", 1) |
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| 188 | except ValueError : |
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| 189 | raise PyKotaToolError, "Invalid DEVICE_URI : %s\n" % device_uri |
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| 190 | while destination.startswith("/") : |
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| 191 | destination = destination[1:] |
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| 192 | checkauth = destination.split("@", 1) |
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| 193 | if len(checkauth) == 2 : |
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| 194 | destination = checkauth[1] |
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| 195 | printerhostname = destination.split("/")[0].split(":")[0] |
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| 196 | return ("CUPS", \ |
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| 197 | printerhostname, \ |
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| 198 | os.environ.get("PRINTER"), \ |
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| 199 | sys.argv[2].strip(), \ |
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| 200 | sys.argv[1].strip(), \ |
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| 201 | inputfile, \ |
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| 202 | int(sys.argv[4].strip()), \ |
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| 203 | sys.argv[3], \ |
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| 204 | sys.argv[5], \ |
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| 205 | backend) |
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| 206 | |
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| 207 | def logDebug(self, message) : |
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| 208 | """Logs something to debug output if debug is enabled.""" |
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| 209 | if self.debug : |
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| 210 | sys.stderr.write("DEBUG: %s\n" % message) |
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| 211 | sys.stderr.flush() |
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| 212 | |
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| 213 | def logInfo(self, message, level="info") : |
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| 214 | """Logs a message to CUPS' error_log file.""" |
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| 215 | sys.stderr.write("%s: %s\n" % (level.upper(), message)) |
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| 216 | sys.stderr.flush() |
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| 217 | |
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| 218 | if __name__ == "__main__" : |
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| 219 | # This is a CUPS backend, we should act and die like a CUPS backend |
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| 220 | wrapper = CupsBackend() |
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| 221 | if len(sys.argv) == 1 : |
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| 222 | print "\n".join(wrapper.discoverOtherBackends()) |
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| 223 | sys.exit(0) |
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| 224 | elif len(sys.argv) not in (6, 7) : |
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| 225 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n"\ |
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| 226 | % sys.argv[0]) |
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| 227 | sys.exit(1) |
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| 228 | else : |
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| 229 | sys.stderr.write("ERROR: Not Yet !\n") |
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| 230 | sys.exit(1) |
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