#!/usr/bin/env python
# -*- coding:utf-8 -*-
import os
import json
from base64 import b64encode

from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5


def encrypt_pwd(password, public_key):
    rsa_key = RSA.importKey(public_key)
    encryptor = Cipher_pkcs1_v1_5.new(rsa_key)
    cipher = b64encode(encryptor.encrypt(password.encode('utf-8')))
    return cipher.decode('utf-8')


def open_image(image_file):
    if os.name == "nt":
        os.system('start ' + image_file)  # for Windows
    else:
        if os.uname()[0] == "Linux":
            os.system("eog " + image_file)  # for Linux
        else:
            os.system("open " + image_file)  # for Mac


def save_image(resp, image_file):
    with open(image_file, 'wb') as f:
        for chunk in resp.iter_content(chunk_size=1024):
            f.write(chunk)


def parse_json(s):
    begin = s.find('{')
    end = s.rfind('}') + 1
    return json.loads(s[begin:end])