PythonOS_5_kernel.py

#File must be named 'kernel.py'
#Must be in the same directory as 'interp.py' and 'eret.py'
#You must have pycrypto installed on your computer
#Python version must be python 2.7
#Run this file to start the os
#This script is made to run on a unix terminal. the clear screen commands may not match.
__author__ = 'Brad'
import time
import os
import platform
import subprocess
import smtplib
import base64
from Crypto.Cipher import AES

#external file applications
from eret import errorcodes
from interp import interpret

def cls():
    print("\x1B[2J")
def mail():
    print("PythonOS Email Client v0.3")
    print("--------------------------")
    gmail_user = raw_input("Enter your email: ")
    gmail_pwd = raw_input("Enter your email password: ")
    FROM = gmail_user
    TO = [raw_input("Enter recipient email: ")] #must be a list
    SUBJECT = raw_input("Enter email subject: ")
    TEXT = raw_input("Enter message: ")

     # Prepare actual message
    message = """\From: %s\nTo: %s\nSubject: %s\n\n%s
    """ % (FROM, ", ".join(TO), SUBJECT, TEXT)
    try:
        #server = smtplib.SMTP(SERVER)
        server = smtplib.SMTP("smtp.gmail.com", 587) #or port 465 doesn't seem to work!
        server.ehlo()
        server.starttls()
        server.login(gmail_user, gmail_pwd)
        server.sendmail(FROM, TO, message)
        #server.quit()
        server.close()
        print 'successfully sent the mail'
    except:
        print (errorcodes(2))
    osScreen2()

def calculator():
    cls()
    function = raw_input("add, subtract, multiply, or divide?: ")
    if function == "add":
        cls()
        print("Insert first number: ")
        x = float(raw_input())
        cls()
        print("Insert second number: ")
        y = float(raw_input())
        cls()
        add = float(x) + float(y)
        print(str(x) + " + " + str(y) + " = " + str(add))
    elif function == "subtract":
        cls()
        x = float(raw_input("Insert first number: "))
        cls()
        y = float(raw_input("Insert second number: "))
        cls()
        add = float(x) - float(y)
        print(str(x) + " - " + str(y) + " = " + str(add))
    elif function == "multiply":
        cls()
        x = int(raw_input("Insert first factor: "))
        cls()
        y = int(raw_input("Insert second factor: "))
        cls()
        add = float(x) * float(y)
        print(str(x) + " x " + str(y) + " = " + str(add))
    elif function == "divide":
        cls()
        x = float(raw_input("Insert numerator: "))
        cls()
        y = float(raw_input("Insert denominator: "))
        cls()
        add = float(x) / float(y)
        print(str(x) + " / " + str(y) + " = " + str(add))
    else:
        print("invalid operation")
        calculator()
    osScreen2()



#---------------the coms command-------------------------------------------
def commands():
    print("commands: exit, mail, resetpw, rstusr,  coms, clearsc, say, calc, new, view, sysinf, count")
# -------------------the loading account screen ----------------------------
def loadOS():
    cls()
    print("loading your POS account.")
    time.sleep(1)
    cls()
    print("loading your POS account..")
    time.sleep(1)
    cls()
    print("loading your POS account...")
    time.sleep(1)
    osScreen()
#------------------------------------------------------------------------------
#---------------the command interpreter----------------------------------------
def osScreen():
    cls()
    print("POS V 0.2.3 on " + platform.system() + " version: " + platform.version())
    print("for a list of commands type 'coms'")
    osScreen2()
def osScreen2():
    try:
        interpret(raw_input(">"))
        osScreen2()
    except:
        print("invalid syntax")
        osScreen2()
def first():
    try:
        f1 = open("pass.enc")
        pass1 = f1.read()
        f1.close()
        PADDING = '{'
        DecodeAES = lambda c, e: c.decrypt(base64.b64decode(e)).rstrip(PADDING)
        key = 'hj%4jfd 7&gh17g*'
        cipher = AES.new(key)
        decoded = DecodeAES(cipher, pass1)
        print("Welcome to POS")
        print("--------------")
        if decoded == "password":
            print("WARNING: using default os passcode")
            print("----------------------------------")
        us = raw_input("Enter Username: ")
        if us in open("usr.txt").read():
            cls()
            print("Welcome to POS")
            print("--------------")
            if decoded == "password":
                print("WARNING: using default os passcode")
                print("----------------------------------")
            password = raw_input("Enter Password: ")

            if password == decoded:
                loadOS()
            else:
                cls()
                print("Code Incorrect")
                time.sleep(3)
                first()
        else:
            cls()
            print("User does not exist")
            time.sleep(3)
            cls()
            first()
    except IOError:
        print("Creating system files...")
        time.sleep(3)
        cls()
        open("pass.enc", "w").close()
        p1 = open("pass.enc", "r+")
        etext = "password"
        BLOCK_SIZE = 16
        PADDING ='{'
        pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * PADDING
        EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))
        key = 'hj%4jfd 7&gh17g*'
        cipher = AES.new(key)
        encoded = EncodeAES(cipher, etext)
        p1.write(encoded)
        p1.flush()
        open("usr.txt", "w").close()
        p1 = open("usr.txt", "r+")
        p1.write("user")
        p1.flush()
        open("state.txt", "w").close()
        f1 = open("state.txt", "r+")
        f1.write("osState: 1")
        f1.flush()
        print("done")
        time.sleep(1)
        cls()
        first()
first()