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import os
import re
import sys
import json
import tqdm
import time
import codecs
import random
import base64
import struct
import shutil
import requests
import tempfile
from Crypto.Cipher import AES
from Crypto.Util import Counter
sys.path.append(os.getcwd())
from main.configs.config import Config
translations = Config().translations
def makebyte(x):
return codecs.latin_1_encode(x)[0]
def a32_to_str(a):
return struct.pack('>%dI' % len(a), *a)
def get_chunks(size):
p, s = 0, 0x20000
while p + s < size:
yield (p, s)
p += s
if s < 0x100000: s += 0x20000
yield (p, size - p)
def decrypt_attr(attr, key):
attr = codecs.latin_1_decode(AES.new(a32_to_str(key), AES.MODE_CBC, makebyte('\0' * 16)).decrypt(attr))[0].rstrip('\0')
return json.loads(attr[4:]) if attr[:6] == 'MEGA{"' else False
def _api_request(data):
sequence_num = random.randint(0, 0xFFFFFFFF)
params = {'id': sequence_num}
sequence_num += 1
if not isinstance(data, list): data = [data]
for attempt in range(60):
try:
json_resp = json.loads(requests.post(f'https://g.api.mega.co.nz/cs', params=params, data=json.dumps(data), timeout=160).text)
try:
if isinstance(json_resp, list): int_resp = json_resp[0] if isinstance(json_resp[0], int) else None
elif isinstance(json_resp, int): int_resp = json_resp
except IndexError:
int_resp = None
if int_resp is not None:
if int_resp == 0: return int_resp
if int_resp == -3: raise RuntimeError('int_resp==-3')
raise Exception(int_resp)
return json_resp[0]
except (RuntimeError, requests.exceptions.RequestException):
if attempt == 60 - 1: raise
delay = 2 * (2 ** attempt)
time.sleep(delay)
def base64_url_decode(data):
data += '=='[(2 - len(data) * 3) % 4:]
for search, replace in (('-', '+'), ('_', '/'), (',', '')):
data = data.replace(search, replace)
return base64.b64decode(data)
def str_to_a32(b):
if isinstance(b, str): b = makebyte(b)
if len(b) % 4: b += b'\0' * (4 - len(b) % 4)
return struct.unpack('>%dI' % (len(b) / 4), b)
def mega_download_file(file_handle, file_key, dest_path=None, dest_filename=None, file=None):
if file is None:
file_key = str_to_a32(base64_url_decode(file_key))
file_data = _api_request({'a': 'g', 'g': 1, 'p': file_handle})
k = (file_key[0] ^ file_key[4], file_key[1] ^ file_key[5], file_key[2] ^ file_key[6], file_key[3] ^ file_key[7])
iv = file_key[4:6] + (0, 0)
meta_mac = file_key[6:8]
else:
file_data = _api_request({'a': 'g', 'g': 1, 'n': file['h']})
k = file['k']
iv = file['iv']
meta_mac = file['meta_mac']
if 'g' not in file_data: raise Exception(translations["file_not_access"])
file_size = file_data['s']
attribs = decrypt_attr(base64_url_decode(file_data['at']), k)
file_name = dest_filename if dest_filename is not None else attribs['n']
input_file = requests.get(file_data['g'], stream=True).raw
if dest_path is None: dest_path = ''
else: dest_path += '/'
temp_output_file = tempfile.NamedTemporaryFile(mode='w+b', prefix='megapy_', delete=False)
k_str = a32_to_str(k)
aes = AES.new(k_str, AES.MODE_CTR, counter=Counter.new(128, initial_value=((iv[0] << 32) + iv[1]) << 64))
mac_str = b'\0' * 16
mac_encryptor = AES.new(k_str, AES.MODE_CBC, mac_str)
iv_str = a32_to_str([iv[0], iv[1], iv[0], iv[1]])
pbar = tqdm.tqdm(total=file_size, ncols=100, unit="byte")
for _, chunk_size in get_chunks(file_size):
chunk = aes.decrypt(input_file.read(chunk_size))
temp_output_file.write(chunk)
pbar.update(len(chunk))
encryptor = AES.new(k_str, AES.MODE_CBC, iv_str)
for i in range(0, len(chunk)-16, 16):
block = chunk[i:i + 16]
encryptor.encrypt(block)
if file_size > 16: i += 16
else: i = 0
block = chunk[i:i + 16]
if len(block) % 16: block += b'\0' * (16 - (len(block) % 16))
mac_str = mac_encryptor.encrypt(encryptor.encrypt(block))
file_mac = str_to_a32(mac_str)
temp_output_file.close()
if (file_mac[0] ^ file_mac[1], file_mac[2] ^ file_mac[3]) != meta_mac: raise ValueError(translations["mac_not_match"])
file_path = os.path.join(dest_path, file_name)
if os.path.exists(file_path): os.remove(file_path)
shutil.move(temp_output_file.name, file_path)
def mega_download_url(url, dest_path=None, dest_filename=None):
if '/file/' in url:
url = url.replace(' ', '')
file_id = re.findall(r'\W\w\w\w\w\w\w\w\w\W', url)[0][1:-1]
path = f'{file_id}!{url[re.search(file_id, url).end() + 1:]}'.split('!')
elif '!' in url: path = re.findall(r'/#!(.*)', url)[0].split('!')
else: raise Exception(translations["missing_url"])
return mega_download_file(file_handle=path[0], file_key=path[1], dest_path=dest_path, dest_filename=dest_filename) |