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#
# Common cli related functions for RHN Client Tools
# Copyright (c) 1999--2010 Red Hat, Inc.
#
# This software is licensed to you under the GNU General Public License,
# version 2 (GPLv2). There is NO WARRANTY for this software, express or
# implied, including the implied warranties of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
# along with this software; if not, see
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
#
# Red Hat trademarks are not licensed under GPLv2. No permission is
# granted to use or replicate Red Hat trademarks that are incorporated
# in this software or its documentation.
#
# Authors:
#       Adrian Likins <alikins@redhat.com>
#       Preston Brown <pbrown@redhat.com>
#       James Bowes <jbowes@redhat.com> 

import sys
import os

import rpm
import xmlrpclib
import socket

from optparse import Option
from optparse import OptionParser

from OpenSSL import SSL
from OpenSSL import crypto

from rhn import rpclib

import gettext
t = gettext.translation('rhn-client-tools', fallback=True)
_ = t.ugettext

sys.path.append("/usr/share/rhn/")

from up2date_client import config
from up2date_client import up2dateAuth
from up2date_client import up2dateErrors
from up2date_client import up2dateLog
from up2date_client import up2dateUtils

def utf8_encode(msg):
    """ python 2.6- (i.e. RHEL6 and older) could not write unicode to stderr,
        encode it to utf-8.
    """
    if isinstance(msg, unicode):
        msg = msg.encode('utf-8')
    return(msg)

_optionsTable = [
    Option("-v", "--verbose", action="count", default=0,
        help=_("Show additional output")),
    Option("--proxy", action="store",
      help=_("Specify an http proxy to use")),
    Option("--proxyUser", action="store",
      help=_("Specify a username to use with an authenticated http proxy")),
    Option("--proxyPassword", action="store",
      help=_("Specify a password to use with an authenticated http proxy")),
   ]

class RhnCli(object):

    def __init__(self):
        self.optparser = OptionParser(option_list = _optionsTable,
            version = RhnCli.__versionString())

        self.options = None
        self.args = None
        
        self.hasGui = False

    def run(self):
        # catch any uncaught exceptions and handle them nicely
        sys.excepthook = exceptionHandler
        # main loop call
        try:
            self.initialize()
            sys.exit(self.main() or 0)
        except KeyboardInterrupt:
            sys.stderr.write(utf8_encode(_("\nAborted.\n")))
            sys.exit(1)
        except OSError, e:
            sys.stderr.write(utf8_encode(_("An unexpected OS error occurred: %s\n") % e))
            sys.exit(1)
        except rpclib.MalformedURIError, e: # Subclass of IOError so must come 1st?
            if e is None or len(str(e)) == 0:
                sys.stderr.write(utf8_encode(_("A connection was attempted with a malformed URI.\n")))
            else:
                sys.stderr.write(utf8_encode(_("A connection was attempted with a malformed URI: %s.\n") % e))
        except IOError, e:
            sys.stderr.write(utf8_encode(_("There was some sort of I/O error: %s\n") % e))
            sys.exit(1)
        except SSL.Error, e:
            sys.stderr.write(utf8_encode(_("There was an SSL error: %s\n") % e))
            sys.stderr.write(utf8_encode(_("A common cause of this error is the system time being incorrect. " \
                               "Verify that the time on this system is correct.\n")))
            sys.exit(1)
        except (SSL.SysCallError, socket.error), e:
            sys.stderr.write(utf8_encode("OpenSSL.SSL.SysCallError: %s\n" % str(e)))
            sys.exit(2)
        except crypto.Error, e:
            sys.stderr.write(utf8_encode(_("There was a SSL crypto error: %s\n") % e))
        except SystemExit, e:
            raise e
        except up2dateErrors.AuthenticationError, e:
            sys.stderr.write(utf8_encode(_("There was an authentication error: %s\n") % e))
            sys.exit(1)
        except up2dateErrors.RpmError, e:
            sys.stderr.write(utf8_encode("%s\n" % e))
            sys.exit(1)
        except xmlrpclib.ProtocolError, e:
            sys.stderr.write(utf8_encode("XMLRPC ProtocolError: %s\n" % str(e)))
            sys.exit(3)

    def initialize(self):
        (self.options, self.args) = self.optparser.parse_args()
 
        RhnCli.__setDebugLevel(self.options.verbose)

        # see if were running as root
        if os.geteuid() != 0:
            rootWarningMsg = _("You must be root to run %s") % sys.argv[0]
            self._warning_dialog(rootWarningMsg)
            sys.exit(1)

        self.__updateProxyConfig()

    def main(self):
        raise NotImplementedError

    def _testRhnLogin(self):
        try:
            up2dateAuth.updateLoginInfo()
            return True
        except up2dateErrors.ServerCapabilityError, e:
            print e
            return False
        except up2dateErrors.AuthenticationError, e:
            return False
        except up2dateErrors.RhnServerException, e:
            log = up2dateLog.initLog()
            log.log_me('There was a RhnServerException while testing login:\n')
            log.log_exception(*sys.exc_info())
            return False

    def _warning_dialog(self, message):
        if self.hasGui:
            try:
                from up2date_client import gui
                gui.errorWindow(message)
            except:
                print _("Unable to open gui. Try `up2date --nox`")
                print message
        else:
            print message

    def __updateProxyConfig(self):
        """Update potential proxy configuration.
        Note: this will _not_ save the info to up2date's configuration file
        A separate call to config.initUp2dateConfig.save() is needed.
        """
        cfg = config.initUp2dateConfig()

        if self.options.proxy:
            cfg.set("httpProxy", self.options.proxy)
            cfg.set("enableProxy", 1)
        if self.options.proxyUser:
            cfg.set("proxyUser", self.options.proxyUser)
            cfg.set("enableProxyAuth", 1)
        if self.options.proxyPassword:
            cfg.set("proxyPassword", self.options.proxyPassword)
            cfg.set("enableProxyAuth", 1)

    def saveConfig(self):
        """
        Saves the current up2date configuration being used to disk.
        """
        cfg = config.initUp2dateConfig()
        cfg.save()

    def __faultError(self, errMsg):
        if self.hasGui:
            try:
                from up2date_client import gui
                gui.errorWindow(errMsg)
            except:
                print _("Unable to open gui. Try `up2date --nox`")
                print errMsg
        else:
            print errMsg

    @staticmethod
    def __versionString():
        versionString = _("%%prog (Red Hat Network Client Tools) %s\n"
        "Copyright (C) 1999--2010 Red Hat, Inc.\n"
        "Licensed under the terms of the GPLv2.") % up2dateUtils.version()
        return versionString

    @staticmethod
    def __setDebugLevel(level):
        cfg = config.initUp2dateConfig()
        # figure out the debug level
        cfg["debug"] = cfg["debug"] + level 
        if cfg["debug"] > 2:
            # Set rpm's verbosity mode
            try:
                rpm.setVerbosity(rpm.RPMLOG_DEBUG)
            except AttributeError:
                print "extra verbosity not supported in this version of rpm"

def exceptionHandler(type, value, tb):
    log = up2dateLog.initLog()
    sys.stderr.write(utf8_encode(_("An error has occurred:") + "\n"))
    if hasattr(value, "errmsg"):
        sys.stderr.write(utf8_encode(value.errmsg) + "\n")
        log.log_exception(type, value, tb)
    else:
        sys.stderr.write(utf8_encode(str(type) + "\n"))
        log.log_exception(type, value, tb)

    sys.stderr.write(utf8_encode(_("See /var/log/up2date for more information") + "\n"))