#! /usr/bin/env python
# -*- coding: ISO-8859-15 -*-
#
# PyKota
#
# PyKota : Print Quotas for CUPS and LPRng
#
# (c) 2003, 2004, 2005, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# $Id$
#
#

import sys
import os
import stat
import tempfile
import pwd
import grp

nowready = """


PyKota is now ready to run !

Before printing, you still have to manually modify CUPS' printers.conf
to manually prepend cupspykota:// in front of each DeviceURI.

Once this is done, just restart CUPS and all should work fine.

Please report any problem to : alet@librelogiciel.com

Thanks in advance.
"""

pghbaconf = """local\tall\tpostgres\t\tident sameuser
local\tall\tall\t\tident sameuser
host\tall\tall\t127.0.0.1\t255.255.255.255\tident sameuser
host\tall\tall\t::1\tffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff\treject
host\tall\tall\t::ffff:127.0.0.1/128\treject
host\tall\tall\t0.0.0.0\t0.0.0.0\treject"""

pykotadminconf = """[global]
storageadmin: pykotaadmin
storageadminpw: readwritepw"""

pykotaconf = """#
# This is a generated configuration file for PyKota
#
# IMPORTANT : many more directives can be used, and some of the directives
# below accept different and/or more complex parameters. Please read
# /usr/share/pykota/conf/pykota.conf.sample for more details about the 
# numerous possibilities allowed.
#
[global]

# Database settings
storagebackend : pgstorage
storageserver : %(storageserver)s
storagename : pykota
storageuser : pykotauser
storageuserpw : readonlypw
storagecaching : No
disablehistory : No

# Logging method
logger : system

# Set debug to Yes during installation and testing
debug : Yes

# Who should receive automatic bug reports ?
crashrecipient : pykotacrashed@librelogiciel.com

# Should we keep temporary files on disk ?
# Set this to yes for debugging software accounting problems
keepfiles : no

# Logos for banners and CGI scripts
logourl : http://www.pykota.com/pykota.png
logolink : http://www.pykota.com/

# SMTP
smtpserver : %(smtpserver)s
maildomain : %(dnsdomain)s

# Print Administrator
admin : %(adminname)s
adminmail : %(adminemail)s

# Use usernames as-is or convert them to lowercase ?
utolower : No

# Should we hide some fields in the history (title, filename) ?
privacy : no

# Should we charge end users when an error occurs ?
onbackenderror : nocharge

# Default accounting methods :
preaccounter : software()
accounter : software()
onaccountererror : stop

# Who will receive warning messages ? 
# both means admin and user.
mailto : both

# Grace delay for pages based quotas, works the same
# as for disk quotas
gracedelay : 7

# Configurable zero, to give free credits
balancezero : 0.0

# Warning limit for credit based quotas
poorman : 1.0

# Warning messages to use 
poorwarn : Your Print Quota account balance is low. 
 Soon you'll not be allowed to print anymore.

softwarn : Your Print Quota Soft Limit is reached.
 This means that you may still be allowed to print for some
 time, but you must contact your administrator to purchase 
 more print quota.

hardwarn : Your Print Quota Hard Limit is reached.
 This means that you are not allowed to print anymore.
 Please contact your administrator at root@localhost
 as soon as possible to solve the problem.

# Number of banners allowed to be printed by users 
# who are over quota
maxdenybanners : 0

# Should we allow users to ever be over quota on their last job ?
# strict means no.
enforcement : strict

# Should we trust printers' internal page counter ?
trustjobsize : yes

# How to handle duplicate jobs
denyduplicates : no
duplicatesdelay : 0

# What should we do when an unknown user prints ?
# The policy below will automatically create a printing account
# for unknown users, allowing them to print with no limit on the
# current printer.
policy : external(pkusers --add --skipexisting --limitby noquota --description "Added automatically" \$PYKOTAUSERNAME && edpykota --add --skipexisting --printer \$PYKOTAPRINTERNAME \$PYKOTAUSERNAME)

"""


class PyKotaSetup :
    """Base class for PyKota installers."""
    backendsdirectory = "/usr/lib/cups/backend" # overload it if needed
    pykotadirectory = "/usr/share/pykota"       # overload it if needed
    pgrestart = "/etc/init.d/postgresql* restart" # overload it if needed
    cupsrestart = "/etc/init.d/cupsys restart"  # overload it if needed
    adduser = "adduser --system --group --home /etc/pykota --gecos PyKota pykota" # overload it if needed
    packages = [ "wget", 
                 "bzip2", 
                 "subversion", 
                 "postgresql", 
                 "postgresql-client",
                 "cupsys",
                 "cupsys-client",
                 "python-dev",
                 "python-jaxml",
                 "python-reportlab",
                 "python-reportlab-accel",
                 "python-psyco",
                 "python-pygresql",
                 "python-psyco",
                 "python-osd",
                 "python-egenix-mxdatetime",
                 "python-imaging",
                 "python-pysnmp4",
                 "python-chardet",
                 "python-pam" ]
        
    otherpackages = [ { "name" : "pkpgcounter",
                        "version" : "2.10",
                        "url" : "http://www.pykota.com/software/%(name)s/download/tarballs/%(name)s-%(version)s.tar.gz",
                        "commands" : [ "tar -zxf %(name)s-%(version)s.tar.gz",
                                       "cd %(name)s-%(version)s",
                                       "python setup.py install",
                                     ],
                      },
                      { "name" : "pkipplib",
                        "version" : "0.07",
                        "url" : "http://www.pykota.com/software/%(name)s/download/tarballs/%(name)s-%(version)s.tar.gz",
                        "commands" : [ "tar -zxf %(name)s-%(version)s.tar.gz",
                                       "cd %(name)s-%(version)s",
                                       "python setup.py install",
                                     ],
                      },
                      { "name" : "ghostpcl",
                        "version" : "1.41",
                        "url" : "ftp://mirror.cs.wisc.edu/pub/mirrors/ghost/AFPL/GhostPCL/%(name)s_%(version)s.tar.bz2", 
                        "commands" : [ "bunzip2 <%(name)s_%(version)s.tar.bz2 | tar -xf -",
                                       "cd %(name)s_%(version)s",
                                       "make fonts",
                                       "make product",
                                       "make install",
                                     ],
                      },
                   ]  
                   
    def __init__(self) :               
        """Initializes instance specific datas."""
        self.launched = []
        
    def yesno(self, message) :        
        """Asks the end user some question and returns the answer."""
        answer = raw_input("\n%s ? " % message).strip().upper()[0]
        return answer == 'Y'
        
    def confirmCommand(self, message, command, record=True) :    
        """Asks for confirmation before a command is launched, and launches it if needed."""
        if self.yesno("The following command will be launched %(message)s :\n%(command)s\nDo you agree" % locals()) :
            os.system(command)
            if record :
                self.launched.append(command)
            return True
        else :
            return False
            
    def confirmPipe(self, message, command) :    
        """Asks for confirmation before a command is launched in a pipe, launches it if needed, and returns the result."""
        if self.yesno("The following command will be launched %(message)s :\n%(command)s\nDo you agree" % locals()) :
            pipeprocess = os.popen(command, "r")
            result = pipeprocess.read()
            pipeprocess.close()
            return result
        else :
            return False
            
    def listPrinters(self) :
        """Returns a list of tuples (queuename, deviceuri) for all existing print queues."""
        result = os.popen("lpstat -v", "r")
        lines = result.readlines()
        result.close()
        printers = []
        for line in lines :
            (begin, end) = line.split(':', 1)
            deviceuri = end.strip()
            queuename = begin.split()[-1]
            printers.append((queuename, deviceuri))
        return printers    
        
    def downloadOtherPackages(self) :    
        """Downloads and install additional packages from http://www.pykota.com or other websites"""
        olddirectory = os.getcwd()
        directory = tempfile.mkdtemp()
        print "\nDownloading additional software not available as packages in %(directory)s" % locals()
        os.chdir(directory)
        for package in self.otherpackages :
            name = package["name"]
            version = package["version"]
            url = package["url"] % locals()
            commands = " && ".join(package["commands"]) % locals()
            if url.startswith("svn://") :
                download = 'svn export "%(url)s" %(name)s' % locals()
            else :    
                download = 'wget "%(url)s"' % locals()
            if self.confirmCommand("to download %(name)s" % locals(), download) :
                self.confirmCommand("to install %(name)s" % locals(), commands)
        self.confirmCommand("to remove the temporary directory %(directory)s" % locals(),     
                            "rm -fr %(directory)s" % locals(),
                            record=False)
        os.chdir(olddirectory)    
        
    def waitPrintersOnline(self) :
        """Asks the admin to switch all printers ON."""
        while not self.yesno("First you MUST switch ALL your printers ON. Are ALL your printers ON") :
            pass
            
    def setupDatabase(self) :
        """Creates the database."""
        pykotadirectory = self.pykotadirectory
        self.confirmCommand("to create PyKota's database in PostgreSQL", 'su - postgres -c "psql -f %(pykotadirectory)s/postgresql/pykota-postgresql.sql template1"' % locals())
        
    def configurePostgreSQL(self) :
        """Configures PostgreSQL for PyKota to work."""
        pgconffile = self.confirmPipe("to find PostgreSQL's configuration files", "find /etc -name postgresql.conf 2>/dev/null")
        if pgconffile is not False :
            pgconffile = pgconffile.strip()
            pgconfdir = os.path.split(pgconffile)[0]
            answer = self.confirmPipe("to see if PostgreSQL accepts TCP/IP connections", "grep ^tcpip_socket %(pgconffile)s" % locals())
            conflines = pghbaconf.split("\n")
            if answer is not False :
                tcpip = answer.strip().lower().endswith("true")
            else :    
                tcpip = False
            if tcpip :    
                conflines.insert(2, "host\tpykota\tpykotaadmin,pykotauser\t127.0.0.1\t255.255.255.255\tmd5")
            else :
                conflines.insert(1, "local\tpykota\tpykotaadmin,pykotauser\t\tmd5")
            conf = "\n".join(conflines)
            self.confirmCommand("to configure PostgreSQL correctly for PyKota", 'echo "%(conf)s" >%(pgconfdir)s/pg_hba.conf' % locals())
            self.confirmCommand("to make PostgreSQL take the changes into account", self.pgrestart)
            return tcpip
        return None    
        
    def genConfig(self, adminname, adminemail, dnsdomain, smtpserver, home, tcpip) :        
        """Generates minimal configuration files for PyKota."""
        if tcpip :
            storageserver = "localhost"
        else :    
            storageserver = ""
        conf = pykotaconf % locals()
        self.confirmCommand("to generate PyKota's main configuration file", 'echo "%(conf)s" >%(home)s/pykota.conf' % locals())
        conf = pykotadminconf % locals()
        self.confirmCommand("to generate PyKota's administrators configuration file", 'echo "%(conf)s" >%(home)s/pykotadmin.conf' % locals())
        self.confirmCommand("to change permissions on PyKota's administrators configuration file", "chmod 640 %(home)s/pykotadmin.conf" % locals())
        self.confirmCommand("to change permissions on PyKota's main configuration file", "chmod 644 %(home)s/pykota.conf" % locals())
        self.confirmCommand("to change ownership of PyKota's configuration files", "chown pykota.pykota %(home)s/pykota.conf %(home)s/pykotadmin.conf" % locals())
        answer = self.confirmPipe("to automatically detect the best settings for your printers", "pkturnkey --doconf 2>/dev/null")
        if answer is not False :
            lines = answer.split("\n")
            begin = end = None
            for i in range(len(lines)) :
                line = lines[i]
                if line.strip().startswith("--- CUT ---") :
                    if begin is None :
                        begin = i
                    else :    
                        end = i
                        
            if (begin is not None) and (end is not None) :
                suffix = "\n".join(lines[begin+1:end])
                self.confirmCommand("to improve PyKota's configuration wrt your existing printers", 'echo "%(suffix)s" >>%(home)s/pykota.conf' % locals())
        
    def importPrinters(self) :
        """Imports the existing print queues in the database."""
        self.confirmCommand("to import your existing print queues into PyKota's database", "pkturnkey --force 2>/dev/null")
            
    def addPyKotaUser(self) :
        """Adds a system user named pykota, returns its home directory or None"""
        try :
            user = pwd.getpwnam("pykota")
        except KeyError :    
            if self.confirmCommand("to create a system user named 'pykota'", self.adduser) :
                try :    
                    return pwd.getpwnam("pykota")[5]
                except KeyError :    
                    return None
            else :        
                return None
        else :    
            return user[5]
    
    def setupBackend(self) :
        """Installs the cupspykota backend."""
        backendsdirectory = self.backendsdirectory
        pykotadirectory = self.pykotadirectory
        self.confirmCommand("to make PyKota known to CUPS", "ln -s %(pykotadirectory)s/cupspykota %(backendsdirectory)s/cupspykota" % locals())
        self.confirmCommand("to restart CUPS for the changes to take effect", self.cupsrestart)
        
    def managePrinters(self, printers) :    
        """For each printer, asks if it should be managed with PyKota or not."""
        for (queuename, deviceuri) in printers :
            if not deviceuri.startswith("cupspykota:") :
                newdeviceuri = "cupspykota://%s" % deviceuri
                command = "lpadmin -p %(queuename)s -v %(newdeviceuri)s" % locals()
                self.confirmCommand("to manage the %(queuename)s print queue with PyKota" % locals(), command)
    
    def setup(self) :
        """Installation procedure."""
        self.waitPrintersOnline()
        adminname = raw_input("What is the name of the print administrator ? ").strip()
        adminemail = raw_input("What is the email address of the print administrator ? ").strip()
        dnsdomain = raw_input("What is your DNS domain name ? ").strip()
        smtpserver = raw_input("What is the hostname or IP address of your SMTP server ? ").strip()
        homedirectory = self.addPyKotaUser()
        if homedirectory is None :
            sys.stderr.write("Installation can't proceed. You MUST create a system user named 'pykota'.\n")
        else :    
            self.upgradeSystem()
            self.setupPackages()
            self.downloadOtherPackages()
            tcpip = self.configurePostgreSQL()
            self.genConfig(adminname, adminemail, dnsdomain, smtpserver, homedirectory, tcpip)
            self.setupDatabase()
            self.setupBackend()
            self.managePrinters(self.listPrinters())
            self.importPrinters()
            print nowready
            print "The script %s can be used to reinstall in unattended mode.\n" % self.genInstaller()
            
    def genInstaller(self) :        
        """Generates an installer script."""
        scriptname = "/tmp/pykota-installer.sh"
        commands = [ "#! /bin/sh", 
                     "#",
                     "# PyKota installer script.", 
                     "#", 
                     "# This script was automatically generated.",
                     "#",
                   ] + self.launched
        script = open(scriptname, "w")           
        script.write("\n".join(commands))
        script.close()
        os.chmod(scriptname, \
                 stat.S_IRWXU | stat.S_IRGRP | stat.S_IXGRP | stat.S_IROTH | stat.S_IXOTH)
        return scriptname    
        
        
class Debian(PyKotaSetup) :        
    """Class for Debian installer."""
    def setupPackages(self) :    
        """Installs missing Debian packages."""
        self.confirmCommand("to install missing dependencies", "apt-get install %s" % " ".join(self.packages))
            
    def upgradeSystem(self) :
        """Upgrades the Debian setup."""
        if self.confirmCommand("to grab an up-to-date list of available packages", "apt-get update") :
            self.confirmCommand("to put your system up-to-date", "apt-get -y dist-upgrade")
    
class Ubuntu(Debian) :    
    """Class for Ubuntu installer."""
    pass
    
if __name__ == "__main__" :        
    retcode = 0
    if len(sys.argv) != 2 :
        sys.stderr.write("usage : pksetup distribution\ne.g. : pksetup debian\n")
    else :    
        classname = sys.argv[1].strip().title()
        try :
            installer = globals()[classname]()
        except KeyError :    
            sys.stderr.write("There's currently no support for the %s distribution, sorry.\n" % sys.argv[1])
            retcode = -1
        else :    
            try :
                retcode = installer.setup()
            except KeyboardInterrupt :             
                sys.stderr.write("\n\n\nWARNING : Setup was aborted at user's request !\n\n")
                retcode = -1
    sys.exit(retcode)