1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | |
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4 | # Tea4CUPS : 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 md5 |
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29 | import cStringIO |
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30 | import shlex |
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31 | import tempfile |
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32 | import ConfigParser |
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33 | |
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34 | class TeeError(Exception): |
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35 | """Base exception for Tea4CUPS related stuff.""" |
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36 | def __init__(self, message = ""): |
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37 | self.message = message |
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38 | Exception.__init__(self, message) |
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39 | def __repr__(self): |
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40 | return self.message |
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41 | __str__ = __repr__ |
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42 | |
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43 | class ConfigError(TeeError) : |
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44 | """Configuration related exceptions.""" |
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45 | pass |
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46 | |
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47 | class FakeConfig : |
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48 | """Fakes a configuration file parser.""" |
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49 | def get(self, section, option, raw=0) : |
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50 | """Fakes the retrieval of a global option.""" |
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51 | raise ConfigError, "Invalid configuration file : no option %s in section [%s]" % (option, section) |
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52 | |
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53 | class CupsBackend : |
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54 | """Base class for tools with no database access.""" |
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55 | def __init__(self) : |
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56 | """Initializes the CUPS backend wrapper.""" |
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57 | self.MyName = "Tea4CUPS" |
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58 | self.myname = "tea4cups" |
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59 | self.pid = os.getpid() |
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60 | confdir = os.environ.get("CUPS_SERVERROOT", ".") |
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61 | self.conffile = os.path.join(confdir, "%s.conf" % self.myname) |
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62 | if os.path.isfile(self.conffile) : |
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63 | self.config = ConfigParser.ConfigParser() |
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64 | self.config.read([self.conffile]) |
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65 | self.debug = self.isTrue(self.getGlobalOption("debug", ignore=1)) |
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66 | else : |
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67 | self.config = FakeConfig() |
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68 | self.debug = 1 # no config, so force debug mode ! |
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69 | |
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70 | def logDebug(self, message) : |
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71 | """Logs something to debug output if debug is enabled.""" |
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72 | if self.debug : |
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73 | sys.stderr.write("DEBUG: %s (PID %i) : %s\n" % (self.MyName, self.pid, message)) |
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74 | sys.stderr.flush() |
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75 | |
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76 | def logInfo(self, message, level="info") : |
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77 | """Logs a message to CUPS' error_log file.""" |
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78 | sys.stderr.write("%s: %s (PID %i) : %s\n" % (level.upper(), self.MyName, self.pid, message)) |
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79 | sys.stderr.flush() |
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80 | |
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81 | def isTrue(self, option) : |
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82 | """Returns 1 if option is set to true, else 0.""" |
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83 | if (option is not None) and (option.upper().strip() in ['Y', 'YES', '1', 'ON', 'T', 'TRUE']) : |
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84 | return 1 |
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85 | else : |
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86 | return 0 |
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87 | |
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88 | def getGlobalOption(self, option, ignore=0) : |
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89 | """Returns an option from the global section, or raises a ConfigError if ignore is not set, else returns None.""" |
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90 | try : |
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91 | return self.config.get("global", option, raw=1) |
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92 | except (ConfigParser.NoSectionError, ConfigParser.NoOptionError) : |
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93 | if not ignore : |
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94 | raise ConfigError, "Option %s not found in section global of %s" % (option, self.conffile) |
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95 | |
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96 | def getPrintQueueOption(self, printqueuename, option, ignore=0) : |
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97 | """Returns an option from the printer section, or the global section, or raises a ConfigError.""" |
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98 | globaloption = self.getGlobalOption(option, ignore=1) |
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99 | try : |
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100 | return self.config.get(printqueuename, option, raw=1) |
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101 | except (ConfigParser.NoSectionError, ConfigParser.NoOptionError) : |
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102 | if globaloption is not None : |
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103 | return globaloption |
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104 | elif not ignore : |
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105 | raise ConfigError, "Option %s not found in section [%s] of %s" % (option, printqueuename, self.conffile) |
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106 | |
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107 | def enumTeeBranches(self, printqueuename) : |
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108 | """Returns the list of branches for a particular section's Tee.""" |
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109 | try : |
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110 | globalbranches = [ (k, v) for (k, v) in self.config.items("global") if k.startswith("tee_") ] |
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111 | except ConfigParser.NoSectionError, msg : |
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112 | self.printInfo("Invalid configuration file : %s" % msg, "error") |
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113 | globalbranches = [] |
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114 | try : |
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115 | sectionbranches = [ (k, v) for (k, v) in self.config.items(printqueuename) if k.startswith("tee_") ] |
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116 | except ConfigParser.NoSectionError, msg : |
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117 | self.printInfo("Invalid configuration file : %s" % msg, "error") |
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118 | sectionbranches = [] |
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119 | branches = {} |
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120 | for (k, v) in globalbranches : |
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121 | value = v.strip() |
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122 | if value : |
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123 | branches[k] = value |
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124 | for (k, v) in sectionbranches : |
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125 | value = v.strip() |
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126 | if value : |
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127 | branches[k] = value # overwrite any global option or set a new value |
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128 | else : |
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129 | del branches[k] # empty value disables a global option |
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130 | return branches |
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131 | |
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132 | def discoverOtherBackends(self) : |
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133 | """Discovers the other CUPS backends. |
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134 | |
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135 | Executes each existing backend in turn in device enumeration mode. |
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136 | Returns the list of available backends. |
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137 | """ |
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138 | # Unfortunately this method can't output any debug information |
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139 | # to stdout or stderr, else CUPS considers that the device is |
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140 | # not available. |
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141 | available = [] |
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142 | (directory, myname) = os.path.split(sys.argv[0]) |
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143 | tmpdir = tempfile.gettempdir() |
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144 | lockfilename = os.path.join(tmpdir, "%s..LCK" % myname) |
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145 | if os.path.exists(lockfilename) : |
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146 | lockfile = open(lockfilename, "r") |
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147 | pid = int(lockfile.read()) |
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148 | lockfile.close() |
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149 | try : |
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150 | # see if the pid contained in the lock file is still running |
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151 | os.kill(pid, 0) |
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152 | except OSError, e : |
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153 | if e.errno != errno.EPERM : |
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154 | # process doesn't exist anymore |
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155 | os.remove(lockfilename) |
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156 | |
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157 | if not os.path.exists(lockfilename) : |
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158 | lockfile = open(lockfilename, "w") |
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159 | lockfile.write("%i" % self.pid) |
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160 | lockfile.close() |
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161 | allbackends = [ os.path.join(directory, b) \ |
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162 | for b in os.listdir(directory) |
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163 | if os.access(os.path.join(directory, b), os.X_OK) \ |
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164 | and (b != myname)] |
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165 | for backend in allbackends : |
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166 | answer = os.popen(backend, "r") |
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167 | try : |
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168 | devices = [line.strip() for line in answer.readlines()] |
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169 | except : |
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170 | devices = [] |
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171 | status = answer.close() |
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172 | if status is None : |
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173 | for d in devices : |
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174 | # each line is of the form : |
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175 | # 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
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176 | # so we have to decompose it carefully |
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177 | fdevice = cStringIO.StringIO(d) |
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178 | tokenizer = shlex.shlex(fdevice) |
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179 | tokenizer.wordchars = tokenizer.wordchars + \ |
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180 | r".:,?!~/\_$*-+={}[]()#" |
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181 | arguments = [] |
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182 | while 1 : |
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183 | token = tokenizer.get_token() |
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184 | if token : |
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185 | arguments.append(token) |
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186 | else : |
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187 | break |
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188 | fdevice.close() |
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189 | try : |
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190 | (devicetype, device, name, fullname) = arguments |
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191 | except ValueError : |
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192 | pass # ignore this 'bizarre' device |
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193 | else : |
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194 | if name.startswith('"') and name.endswith('"') : |
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195 | name = name[1:-1] |
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196 | if fullname.startswith('"') and fullname.endswith('"') : |
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197 | fullname = fullname[1:-1] |
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198 | available.append('%s %s:%s "%s+%s" "%s managed %s"' \ |
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199 | % (devicetype, self.myname, device, self.MyName, name, self.MyName, fullname)) |
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200 | os.remove(lockfilename) |
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201 | return available |
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202 | |
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203 | def initBackend(self) : |
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204 | """Initializes the backend's attributes.""" |
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205 | # check that the DEVICE_URI environment variable's value is |
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206 | # prefixed with self.myname otherwise don't touch it. |
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207 | # If this is the case, we have to remove the prefix from |
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208 | # the environment before launching the real backend |
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209 | muststartwith = "%s:" % self.myname |
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210 | device_uri = os.environ.get("DEVICE_URI", "") |
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211 | if device_uri.startswith(muststartwith) : |
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212 | fulldevice_uri = device_uri[:] |
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213 | device_uri = fulldevice_uri[len(muststartwith):] |
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214 | if device_uri.startswith("//") : |
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215 | device_uri = device_uri[2:] |
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216 | try : |
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217 | (backend, destination) = device_uri.split(":", 1) |
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218 | except ValueError : |
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219 | raise TeeError, "Invalid DEVICE_URI : %s\n" % device_uri |
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220 | |
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221 | self.JobId = sys.argv[1].strip() |
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222 | self.UserName = sys.argv[2].strip() |
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223 | self.Title = sys.argv[3].strip() |
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224 | self.Copies = int(sys.argv[4].strip()) |
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225 | self.Options = sys.argv[5].strip() |
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226 | if len(sys.argv) == 7 : |
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227 | self.InputFile = sys.argv[6] # read job's datas from file |
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228 | else : |
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229 | self.InputFile = None # read job's datas from stdin |
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230 | |
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231 | self.RealBackend = backend |
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232 | self.DeviceURI = device_uri |
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233 | self.PrinterName = os.environ.get("PRINTER", "") |
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234 | self.Directory = self.getPrintQueueOption(self.PrinterName, "directory") |
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235 | self.DataFile = os.path.join(self.Directory, "%s-%s-%s" % (self.myname, self.PrinterName, self.JobId)) |
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236 | |
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237 | def exportAttributes(self) : |
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238 | """Exports our backend's attributes to the environment.""" |
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239 | os.environ["DEVICE_URI"] = self.DeviceURI # WARNING ! |
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240 | os.environ["TEAPRINTERNAME"] = self.PrinterName |
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241 | os.environ["TEADIRECTORY"] = self.Directory |
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242 | os.environ["TEADATAFILE"] = self.DataFile |
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243 | os.environ["TEAJOBSIZE"] = self.JobSize |
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244 | os.environ["TEAMD5SUM"] = self.JobMD5Sum |
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245 | os.environ["TEAJOBID"] = self.JobId |
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246 | os.environ["TEAUSERNAME"] = self.UserName |
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247 | os.environ["TEATITLE"] = self.Title |
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248 | os.environ["TEACOPIES"] = str(self.Copies) |
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249 | os.environ["TEAOPTIONS"] = self.Options |
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250 | os.environ["TEAINPUTFILE"] = self.InputFile or "" |
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251 | |
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252 | def saveDatasAndCheckSum(self) : |
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253 | """Saves the input datas into a static file.""" |
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254 | self.logDebug("Duplicating data stream to %s" % self.DataFile) |
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255 | mustclose = 0 |
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256 | if self.InputFile is not None : |
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257 | infile = open(self.InputFile, "rb") |
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258 | mustclose = 1 |
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259 | else : |
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260 | infile = sys.stdin |
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261 | CHUNK = 64*1024 # read 64 Kb at a time |
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262 | dummy = 0 |
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263 | sizeread = 0 |
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264 | checksum = md5.new() |
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265 | outfile = open(self.DataFile, "wb") |
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266 | while 1 : |
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267 | data = infile.read(CHUNK) |
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268 | if not data : |
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269 | break |
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270 | sizeread += len(data) |
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271 | outfile.write(data) |
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272 | checksum.update(data) |
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273 | if not (dummy % 32) : # Only display every 2 Mb |
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274 | self.logDebug("%s bytes saved..." % sizeread) |
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275 | dummy += 1 |
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276 | outfile.close() |
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277 | if mustclose : |
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278 | self.infile.close() |
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279 | self.JobSize = sizeread |
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280 | self.JobMD5Sum = checksum.hexdigest() |
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281 | self.logDebug("Job %s is %s bytes long." % (self.JobId, self.JobSize)) |
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282 | self.logDebug("Job %s MD5 sum is %s" % (self.JobId, self.JobMD5Sum)) |
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283 | |
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284 | def cleanUp(self) : |
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285 | """Cleans up the place.""" |
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286 | if not self.isTrue(self.getPrintQueueOption(self.PrinterName, "keepfiles", ignore=1)) : |
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287 | os.remove(self.DataFile) |
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288 | |
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289 | if __name__ == "__main__" : |
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290 | # This is a CUPS backend, we should act and die like a CUPS backend |
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291 | wrapper = CupsBackend() |
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292 | if len(sys.argv) == 1 : |
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293 | print "\n".join(wrapper.discoverOtherBackends()) |
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294 | sys.exit(0) |
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295 | elif len(sys.argv) not in (6, 7) : |
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296 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n"\ |
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297 | % sys.argv[0]) |
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298 | sys.exit(1) |
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299 | else : |
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300 | wrapper.initBackend() |
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301 | wrapper.saveDatasAndCheckSum() |
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302 | wrapper.exportAttributes() |
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303 | wrapper.cleanUp() |
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304 | sys.stderr.write("ERROR: Not Yet !\n") |
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305 | sys.exit(1) |
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