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#coding:utf-8

#!/usr/bin/python3
#
#  Copyright (c) 2007-2009 Canonical Ltd.
#
#  Author: Oliver Grawert <ogra@ubuntu.com>
#
#  Modifications 2013 from papoteur <papoteur@mageialinux-online.org>
#  and Geiger David <david.david@mageialinux-online.org>
#
#  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 St, Fifth Floor, Boston, MA 02110-1301, USA.

###########
# imports #
###########
#import locale
import os
import io
import gettext
from subprocess import call, Popen, PIPE
import hashlib
import gnupg
import time
import logging
       
class Dumper(object):

    def _do_write(self,source,target, b):
        # Writing step
        #Dump mode
        self.returncode=0
        self.operation=True
        bs=4096*128
        try:
            ifc=io.open(source, "rb",1)
        except:
            message = _('Reading error.')+ source
            logging.debug(message)
            self.return_state = False
            self.return_message = message
            self.finished.set()
            return
        else:
            try:
                ofc= io.open(target, 'wb',0)
            except:
                 message = _("You don't have permission to write to the device {}").format(target)
                 logging.error(message)
                 self.return_state = False
                 self.return_message = message
                 self.finished.set()
                 return
            else:
                self.operation=True
                steps=list(range(0, b+1, int(b/100)))
                steps.append(b)
                indice=1
                written=0
                ncuts=int(b/bs)
                while ncuts <= 100:
                    bs=int(bs/2)
                    ncuts=int(b/bs)
                for i in range(0,int(ncuts)+1):
                    try:
                        buf=ifc.read(bs)
                    except:
                        message = _("Reading error.")
                        logging.error(message)
                        self.return_state = False
                        self.return_message = message
                        self.finished.set()
                        return
                    try:
                        ofc.write(buf)
                    except:
                        message = _("Writing error.")
                        logging.debug(message)
                        self.return_state = False
                        self.return_message = message
                        self.finished.set()
                        return
                    written+=len(buf)
                    if written > steps[indice]:
                        if indice%1==0:
                            self._progress = indice
                        indice +=1
                        try:
                            os.fsync(ofc)
                        except:
                           message = _("Writing error.")
                           logging.debug(message)
                           self.return_state = False
                           self.return_message = message
                           self.finished.set()
                           return
                try:
                    ofc.close()
                except:
                   message = _("Writing error.")
                   logging.error(message)
                   self.return_message = message
                   self.return_state = False
                   return
            ifc.close()
            self._progress = 100
            self.finished.set()
            self.return_state = True
            self.return_message = _("Writing terminated")
            logging.debug(self.return_message)
            return

    def _do_unmount(self, target):
        target = target[0]
        logging.debug("Starting unmounting")
        message = _("No partition is mounted.")
        retcode = 0
        try:
            lines = [line.strip("\n").split(" ") for line in open ("/etc/mtab", "r").readlines()]
            mounts = [mount for mount in lines if mount[0].startswith(target)]
        except:
             message = _('Could not read mtab ! {} {}'.format(os.getuid(),target))
             return False, message
        if mounts:
            message =_("Unmounting all partitions of  {}:\n").format(target)
            print(message)
        for mount in mounts:
            message +=_("Trying to unmount {}...\n").format(mount[0])
            try:
                retcode = call('umount '+mount[0], shell=True)
                if retcode == 32:
                    message += _('Partition {} is busy').format(mount[0])
                elif retcode< 0:
                    message += _('Error, umount {} was terminated by signal {}').format(mount[0],retcode)
                elif retcode == 0:
                        message += _('{} successfully unmounted').format(mount[0])
                else:
                        message += _('Error, umount returned {}').format(str(retcode))
            except OSError as e:
                message += _('Execution failed: {}').format(str(e))
        logging.info(message)
        return not bool(retcode), message

    def _get_sum(self, source):
        self.return_state = False
        logging.debug("Starting getting sum")
        #       Check if the sum file has a valid signature
        gpg = gnupg.GPG()
        gpg.encoding = 'utf-8'
        # Use Mageia public key
        sig_file = source +'.sha512.gpg'
        try:
            gpg.recv_keys('pgp.mit.edu', 'EDCA7A90')
            self.sum_check_searched = True
            with open(sig_file, 'rb') as g:
                self.signature_found = True
                verified = gpg.verify_file(g, source + ".sha512")
                if verified.valid: 
                    self.signature_checked = True
                    logging.debug("signature checked")
                else:
                    self.signature_checked = False
        except:
            self.signature_found = False
            logging.info(_("Signature file {} not found\n").format(sig_file))
        try:
            # Look for sum files in the same directory as source
            with open(source+'.sha512','r') as fs:
                # Read the sum in the file
                self.sum_check=(fs.readline()).split()[0]
            self.sum_file = True
        except:
            logging.info(_("Sum SHA512 file {} not found\n").format(source+'.sha512'))
            self.sum_file = False

    def _check_write(self, target, source):
        logging.debug("Start checking")
        self.return_state = False
        self.return_message = ""
        b = os.path.getsize(source)
        # Compute the sum from the written device
        steps=list(range(0, b+1, int(b/100)))
        steps.append(b)
        indice=0
        checked=0
        sha512func=hashlib.sha512()
        ncuts=int(b/1024)
        #try:
        with open(target, 'rb') as f:
            for x in range(0,ncuts):
                block = f.read(1024)
                sha512func.update(block)
                if checked > steps[indice]:
                    self._progress = indice
                    indice +=1
                checked+=1024                         
            block = f.read(b-ncuts*1024)
            sha512func.update(block)
            sha512sumcalc=sha512func.hexdigest()
        f.close()
        if self.signature_found and not self.signature_checked:
            self.return_message = _('Invalid signature for %s.sha512')%source
        if (self.sum_check == "") :  # Can't get stored sum
                self.return_message += _('SHA512 sum: {}').format(sha512sumcalc)
        #  compare the sums
        elif (sha512sumcalc == self.sum_check) :
            if self.signature_checked:
                self.return_message +="\n" + _("The sha512 sum check is OK and the sum is signed")
            else :
                self.return_message +="\n" + _("The sha512 sum check is OK but the signature can't be found")
        else: 
            self.return_message +="\n" + _("/!\\The computed and stored sums don't match")
        #except:
        	#pass
        self._progress = 100
        
        logging.info(self.return_message)
        self.return_state = True
        self.finished.set()

    def _do_persistence(self, target, label):
        logging.debug("Start doing persistence partition")
        p = Popen(["fdisk",target], stdin = PIPE)
        p.communicate(input=b'n\np\n3\n\n\nw\n')
        # example mkfs.ext4 -L mgalive-persist /dev/sdf3
        process = Popen(['mkfs.ext4','-L', label,  target+"3"])
        working=True
        while working:
            time.sleep(0.5)
            process.poll()
            rc=process.returncode
            if rc is None:
                working=True
            else:
                process = None
                working= False
        logging.debug("Persistence partition done")
        return rc

        

    def __init__(self):
        gettext.install('isodumper', localedir='/usr/share/locale')
        # Operation running
        self.operation=False