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#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 Stefan Simroth <stefan.simroth@gmail.com>. All Rights Reserved.
# Based on the script for KeepassX by Juhamatti Niemelä <iiska@iki.fi>.
# This file is licensed under the GPLv2+. Please see COPYING for more information.
#
# Usage:
# ./keepass2pass.py -f export.xml
# By default, takes the name of the root element and puts all passwords in there, but you can disable this:
# ./keepass2pass.py -f export.xml -r ""
# Or you can use another root folder:
# ./keepass2pass.py -f export.xml -r foo
#
# Features:
# * This script can handle duplicates and will merge them.
# * Besides the password also the fields 'UserName', 'URL' and 'Notes' (comment) will be inserted.
# * You get a warning if an entry has no password, but it will still insert it.

import getopt, sys
from subprocess import Popen, PIPE
from xml.etree import ElementTree


def pass_import_entry(path, data):
    """ Import new password entry to password-store using pass insert command """
    proc = Popen(['pass', 'insert', '--multiline', path], stdin=PIPE, stdout=PIPE)
    proc.communicate(data.encode('utf8'))
    proc.wait()
    

def get_value(elements, node_text):
    for element in elements:
        for child in element.findall('Key'):
            if child.text == node_text:
                return element.find('Value').text
    return ''        

def path_for(element, path=''):
    """ Generate path name from elements title and current path """
    if element.tag == 'Entry':
        title = get_value(element.findall("String"), "Title")
    elif element.tag == 'Group':
        title = element.find('Name').text
    else: title = ''
    
    if path == '': return title
    else: return '/'.join([path, title])

def password_data(element, path=''):
    """ Return password data and additional info if available from password entry element. """
    data = ""
    password = get_value(element.findall('String'), 'Password')
    if password is not None: data = password + "\n"
    else:
        print "[WARN] No password: %s" % path_for(element, path)
    
    for field in ['UserName', 'URL', 'Notes']:
        value = get_value(element, field)
        if value is not None and not len(value) == 0:
            data = "%s%s: %s\n" % (data, field, value)
    return data

def import_entry(entries, element, path=''):
    element_path = path_for(element, path) 
    if entries.has_key(element_path):
        print "[INFO] Duplicate needs merging: %s" % element_path
        existing_data = entries[element_path]
        data = "%s---------\nPassword: %s" % (existing_data, password_data(element))
    else:
        data = password_data(element, path)
        
    entries[element_path] = data

def import_group(entries, element, path=''):
    """ Import all entries and sub-groups from given group """
    npath = path_for(element, path)
    for group in element.findall('Group'):
        import_group(entries, group, npath)
    for entry in element.findall('Entry'):
        import_entry(entries, entry, npath)

def import_passwords(xml_file, root_path=None):
    """ Parse given Keepass2 XML file and import password groups from it """
    print "[>>>>] Importing passwords from file %s" % xml_file
    print "[INFO] Root path: %s" % root_path
    entries = dict()
    with open(xml_file) as xml:
        text = xml.read()
        xml_tree = ElementTree.XML(text)
        root = xml_tree.find('Root')
        root_group = root.find('Group')
        import_group(entries,root_group,'')
        if root_path is None: root_path = root_group.find('Name').text
        groups = root_group.findall('Group')
        for group in groups:
            import_group(entries, group, root_path)
        password_count = 0
        for path, data in sorted(entries.iteritems()):
            sys.stdout.write("[>>>>] Importing %s ... " % path.encode("utf-8"))
            pass_import_entry(path, data)
            sys.stdout.write("OK\n")
            password_count += 1
            
        print "[ OK ] Done. Imported %i passwords." % password_count


def usage():
    """ Print usage """
    print "Usage: %s -f XML_FILE" % (sys.argv[0])
    print "Optional:"
    print " -r ROOT_PATH    Different root path to use than the one in xml file, use \"\" for none"


def main(argv):
    try:
        opts, args = getopt.gnu_getopt(argv, "f:r:")
    except getopt.GetoptError as err:
        print str(err)
        usage()
        sys.exit(2)
    
    xml_file = None
    root_path = None
    
    for opt, arg in opts:
        if opt in "-f":
            xml_file = arg
        if opt in "-r":
            root_path = arg
    
    if xml_file is not None:
        import_passwords(xml_file, root_path)
    else:
        usage()
        sys.exit(2)
    
if __name__ == '__main__':
    main(sys.argv[1:])