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# coding=utf-8

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import absolute_import
import os
import random
import crypt

__author__ = "Eli Carter"


class HtpasswdDoesNotExists(Exception):
    pass


def salt():
    """
    Returns a string of 2 randome letters
    """
    letters = 'abcdefghijklmnopqrstuvwxyz' \
              'ABCDEFGHIJKLMNOPQRSTUVWXYZ' \
              '0123456789/.'
    return random.choice(letters) + random.choice(letters)


class HtpasswdFile(object):
    """
    A class for manipulating htpasswd files.
    """

    def __init__(self, filename, create=False):
        self.entries = []
        self.filename = filename
        if not create:
            if os.path.exists(self.filename):
                self.load()
            else:
                raise HtpasswdDoesNotExists("%s does not exist" % self.filename)

    def load(self):
        """
        Read the htpasswd file into memory.
        """
        lines = open(self.filename, 'r').readlines()
        self.entries = []
        for line in lines:
            username, pwhash = line.split(':')
            entry = [username, pwhash.rstrip()]
            self.entries.append(entry)

    def save(self):
        """
        Write the htpasswd file to disk
        """
        open(self.filename, 'w').writelines(["%s:%s\n" % (entry[0], entry[1])
                                             for entry in self.entries])

    def update(self, username, password):
        """
        Replace the entry for the given user, or add it if new.
        """
        pwhash = crypt.crypt(password, salt())
        matching_entries = [entry for entry in self.entries
                            if entry[0] == username]
        if matching_entries:
            matching_entries[0][1] = pwhash
        else:
            self.entries.append([username, pwhash])

    def delete(self, username):
        """
        Remove the entry for the given user.
        """
        self.entries = [entry for entry in self.entries
                        if entry[0] != username]
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