Hgame week2

import requests
import base64
import string
def decrypt(token):
    result = ""
    for x in token:
        result += chr(ord(x)-1)
    return result
def strrev(token):
    return token[::-1]
def b64decode(token):
    return base64.b64decode(token.encode()).decode()
def rot13(token):
    result = ""
    for x in token:
        if x in string.ascii_lowercase:
            result += chr(((ord(x)-ord('a')+13)%26)+ord('a'))
        elif x in string.ascii_uppercase:
            result += chr(((ord(x)-ord('A')+13)%26)+ord('A'))
        else:
            result += x
    return result
url = "http://33cb992b0c.php.hgame.n3ko.co/"
php = "http://33cb992b0c.php.hgame.n3ko.co/mycode"
r = requests.get(url)
code = requests.get(php)
token = r.text[625:-21]
en = code.text[164:-75]
de = en.split('(')
de.pop()
for step in de:
    if step == "encrypt":
        token = decrypt(token)
    elif step == "base64_encode":
        token = b64decode(token)
    elif step == "str_rot13":
        token = rot13(token)
    elif step == "strrev":
        token = strrev(token)
flag = requests.post(url, data={"token":token})
print(flag.text)