import re import json from Crypto.Cipher import AES from Crypto.PublicKey import RSA from Crypto.Util import Counter import os import random import binascii import requests from .errors import ValidationError,RequestError from .crypto import * class Mega(object): def __init__(self): self.schema = 'https' self.domain = 'mega.co.nz' self.timeout = 160 #max time (secs) to wait for resp from api requests self.sid = None self.sequence_num = random.randint(0, 0xFFFFFFFF) self.request_id = make_id(10) @classmethod def login(class_, email, password): instance = class_() instance.login_user(email, password) return instance def login_user(self, email, password): password_aes = prepare_key(str_to_a32(password)) uh = stringhash(email, password_aes) resp = self.api_request({'a': 'us', 'user': email, 'uh': uh}) #if numeric error code response if isinstance(resp, int): raise RequestError(resp) self._login_process(resp, password_aes) def _login_process(self, resp, password): encrypted_master_key = base64_to_a32(resp['k']) self.master_key = decrypt_key(encrypted_master_key, password) if 'tsid' in resp: tsid = base64_url_decode(resp['tsid']) key_encrypted = a32_to_str( encrypt_key(str_to_a32(tsid[:16]), self.master_key)) if key_encrypted == tsid[-16:]: self.sid = resp['tsid'] elif 'csid' in resp: encrypted_rsa_private_key = base64_to_a32(resp['privk']) rsa_private_key = decrypt_key(encrypted_rsa_private_key, self.master_key) private_key = a32_to_str(rsa_private_key) self.rsa_private_key = [0, 0, 0, 0] for i in range(4): l = ((ord(private_key[0])*256+ord(private_key[1]) +7) / 8) + 2 self.rsa_private_key[i] = mpi_to_int(private_key[:l]) private_key = private_key[l:] encrypted_sid = mpi_to_int(base64_url_decode(resp['csid'])) rsa_decrypter = RSA.construct( (self.rsa_private_key[0] * self.rsa_private_key[1], 0L, self.rsa_private_key[2], self.rsa_private_key[0], self.rsa_private_key[1])) sid = '%x' % rsa_decrypter.key._decrypt(encrypted_sid) sid = binascii.unhexlify('0' + sid if len(sid) % 2 else sid) self.sid = base64_url_encode(sid[:43]) def api_request(self, data): params = {'id': self.sequence_num} self.sequence_num += 1 if self.sid: params.update({'sid': self.sid}) #ensure input data is a list if not isinstance(data, list): data = [data] req = requests.post( '{0}://g.api.{1}/cs'.format(self.schema, self.domain), params=params, data=json.dumps(data), timeout=self.timeout) json_resp = json.loads(req.text) #if numeric error code response if isinstance(json_resp, int): raise RequestError(json_resp) return json_resp[0] def parse_url(self, url): #parse file id and key from url if ('!' in url): match = re.findall(r'/#!(.*)', url) path = match[0] return path else: raise RequestError('Url key missing') def process_file(self, file, shared_keys): """ Process a file """ if file['t'] == 0 or file['t'] == 1: keys = dict(keypart.split(':',1) for keypart in file['k'].split('/')) uid = file['u'] key = None # my objects if uid in keys : key = decrypt_key(base64_to_a32( keys[uid] ), self.master_key) # shared folders elif 'su' in file and 'sk' in file and ':' in file['k']: shared_key = decrypt_key(base64_to_a32(file['sk']),self.master_key) key = decrypt_key(base64_to_a32(keys[file['h']]),shared_key) if file['su'] not in shared_keys : shared_keys[file['su']] = {} shared_keys[file['su']][file['h']] = shared_key # shared files elif file['u'] and file['u'] in shared_keys : for hkey in shared_keys[file['u']] : shared_key = shared_keys[file['u']][hkey] if hkey in keys : key = keys[hkey] key = decrypt_key(base64_to_a32(key),shared_key) break if key is not None : # file if file['t'] == 0: k = (key[0] ^ key[4], key[1] ^ key[5], key[2] ^ key[6], key[3] ^ key[7]) file['iv'] = key[4:6] + (0, 0) file['meta_mac'] = key[6:8] # folder else: k = key attributes = base64_url_decode(file['a']) attributes = decrypt_attr(attributes, k) file['a'] = attributes # other => wrong object elif file['k'] == '': file['a'] = False elif file['t'] == 2: self.root_id = file['h'] file['a'] = {'n': 'Cloud Drive'} elif file['t'] == 3: self.inbox_id = file['h'] file['a'] = {'n': 'Inbox'} elif file['t'] == 4: self.trashbin_id = file['h'] file['a'] = {'n': 'Rubbish Bin'} return file def init_shared_keys(self,files,shared_keys) : ''' Init shared key not associated with a user. It seems to happen when a folder is shared, some files are exachanged and then the folder is not shared anymore. Keys are stored in files['s'] and files['ok'] ''' ok_dict = {} for ok_item in files['ok'] : shared_key = decrypt_key(base64_to_a32(ok_item['k']),self.master_key) ok_dict[ok_item['h']] = shared_key for s_item in files['s'] : if s_item['u'] not in shared_keys : shared_keys[s_item['u']] = {} if s_item['h'] in ok_dict : shared_keys[s_item['u']][s_item['h']] = ok_dict[s_item['h']] ########################################################################## # GET def find(self, filename): ''' Return file object from given filename ''' files = self.get_files() for file in files.items(): if file[1]['a'] and file[1]['a']['n'] == filename: return file def get_files(self): ''' Get all files in account ''' files = self.api_request({'a': 'f', 'c': 1}) files_dict = {} shared_keys = {} self.init_shared_keys(files,shared_keys) for file in files['f']: processed_file = self.process_file(file,shared_keys) #ensure each file has a name before returning if processed_file['a']: files_dict[file['h']] = processed_file return files_dict def get_upload_link(self, file): ''' Get a files public link inc. decrypted key Requires upload() response as input ''' if 'f' in file: file = file['f'][0] public_handle = self.api_request({'a': 'l', 'n': file['h']}) file_key = file['k'][file['k'].index(':') + 1:] decrypted_key = a32_to_base64(decrypt_key(base64_to_a32(file_key), self.master_key)) return '{0}://{1}/#!{2}!{3}'.format(self.schema, self.domain, public_handle, decrypted_key) else: raise ValueError('''Upload() response required as input, use get_link() for regular file input''') def get_link(self, file): ''' Get a file public link from given file object ''' file = file[1] if 'h' in file and 'k' in file: public_handle = self.api_request({'a': 'l', 'n': file['h']}) file_key = file['k'][file['k'].index(':') + 1:] decrypted_key = a32_to_base64(decrypt_key(base64_to_a32(file_key), self.master_key)) return '{0}://{1}/#!{2}!{3}'.format(self.schema, self.domain, public_handle, decrypted_key) else: raise ValidationError('File id and key must be present') def get_user(self): user_data = self.api_request({'a': 'ug'}) return user_data def get_node_by_type(self, type): ''' Get a node by it's numeric type id, e.g: 0: file 1: dir 2: special: root cloud drive 3: special: inbox 4: special trash bin ''' nodes = self.get_files() for node in nodes.items(): if (node[1]['t'] == type): return node def get_files_in_node(self, target): ''' Get all files in a given target, e.g. 4=trash ''' node_id = self.get_node_by_type(target) files = self.api_request({'a': 'f', 'c': 1}) files_dict = {} shared_keys = {} self.init_shared_keys(files,shared_keys) for file in files['f']: processed_file = self.process_file(file,shared_keys) if processed_file['a'] and processed_file['p'] == node_id[0]: files_dict[file['h']] = processed_file return files_dict def get_id_from_public_handle(self, public_handle): #get node data #TODO fix this function node_data = self.api_request({'a': 'f', 'f': 1, 'p': public_handle}) node_id = None #determine node id for i in node_data['f']: if i['h'] is not u'': node_id = i['h'] return node_id def get_quota(self): ''' Get current remaining disk quota in MegaBytes ''' json_resp = self.api_request({'a': 'uq', 'xfer': 1}) #convert bytes to megabyes return json_resp['mstrg']/1048576 def get_balance(self): ''' Get account monetary balance, Pro accounts only ''' user_data = self.api_request({"a":"uq","pro":1}) if 'balance' in user_data: return user_data['balance'] ########################################################################## # DELETE def delete(self, public_handle): #straight delete by id return self.move(public_handle, 4) def delete_url(self, url): #delete a file via it's url path = self.parse_url(url).split('!') public_handle = path[0] file_id = self.get_id_from_public_handle(public_handle) return self.move(file_id, 4) def destroy(self, file_id): #delete forever by private id return self.api_request({'a': 'd', 'n': file_id, 'i': self.request_id}) def destroy_url(self, url): #delete a file via it's url path = self.parse_url(url).split('!') public_handle = path[0] file_id = self.get_id_from_public_handle(public_handle) return self.destroy(file_id) def move(self, file_id, target): ''' Move a file to another parent node params: a : command n : node we're moving t : id of target parent node, moving to i : request id targets 2 : root 3 : inbox 4 : trash ''' #determine target_node_id target_node_id = str(self.get_node_by_type(target)[0]) return self.api_request({'a': 'm', 'n': file_id, 't': target_node_id, 'i': self.request_id}) def empty_trash(self): # get list of files in rubbish out files = self.get_files_in_node(4) # make a list of json if files != {}: post_list = [] for file in files: post_list.append({"a": "d", "n": file, "i": self.request_id}) return self.api_request(post_list) ########################################################################## # DOWNLOAD def download(self, file, dest_path=None): ''' Download a file by it's file object ''' url = self.get_link(file) self.download_url(url, dest_path) def download_url(self, url, dest_path=None): ''' Download a file by it's public url ''' path = self.parse_url(url).split('!') file_id = path[0] file_key = path[1] self.download_file(file_id, file_key, dest_path, is_public=True) def download_file(self, file_handle, file_key, dest_path=None, is_public=False): if is_public: file_key = base64_to_a32(file_key) file_data = self.api_request({'a': 'g', 'g': 1, 'p': file_handle}) else: file_data = self.api_request({'a': 'g', 'g': 1, 'n': 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] file_url = file_data['g'] file_size = file_data['s'] attribs = base64_url_decode(file_data['at']) attribs = decrypt_attr(attribs, k) file_name = attribs['n'] print("downloading {0} (size: {1}), url = {2}".format(attribs['n'].encode("utf8"), file_size, file_url)) input_file = requests.get(file_url, stream=True).raw if dest_path: output_file = open(dest_path + '/' + file_name, 'wb') else: output_file = open(file_name, 'wb') counter = Counter.new( 128, initial_value=((iv[0] << 32) + iv[1]) << 64) aes = AES.new(a32_to_str(k), AES.MODE_CTR, counter=counter) file_mac = (0, 0, 0, 0) for chunk_start, chunk_size in sorted(get_chunks(file_size).items()): chunk = input_file.read(chunk_size) chunk = aes.decrypt(chunk) output_file.write(chunk) chunk_mac = [iv[0], iv[1], iv[0], iv[1]] for i in range(0, len(chunk), 16): block = chunk[i:i + 16] if len(block) % 16: block += '\0' * (16 - (len(block) % 16)) block = str_to_a32(block) chunk_mac = [ chunk_mac[0] ^ block[0], chunk_mac[1] ^ block[1], chunk_mac[2] ^ block[2], chunk_mac[3] ^ block[3]] chunk_mac = aes_cbc_encrypt_a32(chunk_mac, k) file_mac = [ file_mac[0] ^ chunk_mac[0], file_mac[1] ^ chunk_mac[1], file_mac[2] ^ chunk_mac[2], file_mac[3] ^ chunk_mac[3]] file_mac = aes_cbc_encrypt_a32(file_mac, k) output_file.close() # check mac integrity if (file_mac[0] ^ file_mac[1], file_mac[2] ^ file_mac[3]) != meta_mac: raise ValueError('Mismatched mac') ########################################################################## # UPLOAD def upload(self, filename, dest=None): #determine storage node if dest is None: #if none set, upload to cloud drive node if not hasattr(self, 'root_id'): self.get_files() dest = self.root_id #request upload url, call 'u' method input_file = open(filename, 'rb') size = os.path.getsize(filename) ul_url = self.api_request({'a': 'u', 's': size})['p'] #generate random aes key (128) for file ul_key = [random.randint(0, 0xFFFFFFFF) for r in range(6)] count = Counter.new(128,initial_value=((ul_key[4]<<32)+ul_key[5])<<64) aes = AES.new(a32_to_str(ul_key[:4]), AES.MODE_CTR, counter=count) file_mac = [0, 0, 0, 0] for chunk_start, chunk_size in sorted(get_chunks(size).items()): chunk = input_file.read(chunk_size) #determine chunks mac chunk_mac = [ul_key[4], ul_key[5], ul_key[4], ul_key[5]] for i in range(0, len(chunk), 16): block = chunk[i:i + 16] if len(block) % 16: block += '\0' * (16 - len(block) % 16) block = str_to_a32(block) chunk_mac = [chunk_mac[0] ^ block[0], chunk_mac[1] ^ block[1], chunk_mac[2] ^ block[2], chunk_mac[3] ^ block[3]] chunk_mac = aes_cbc_encrypt_a32(chunk_mac, ul_key[:4]) #our files mac file_mac = [file_mac[0] ^ chunk_mac[0], file_mac[1] ^ chunk_mac[1], file_mac[2] ^ chunk_mac[2], file_mac[3] ^ chunk_mac[3]] file_mac = aes_cbc_encrypt_a32(file_mac, ul_key[:4]) #encrypt file and upload chunk = aes.encrypt(chunk) output_file = requests.post(ul_url + "/" + str(chunk_start), data=chunk, timeout=self.timeout) completion_file_handle = output_file.text #determine meta mac meta_mac = (file_mac[0] ^ file_mac[1], file_mac[2] ^ file_mac[3]) attribs = {'n': os.path.basename(filename)} encrypt_attribs = base64_url_encode(encrypt_attr(attribs, ul_key[:4])) key = [ul_key[0] ^ ul_key[4], ul_key[1] ^ ul_key[5], ul_key[2] ^ meta_mac[0], ul_key[3] ^ meta_mac[1], ul_key[4], ul_key[5], meta_mac[0], meta_mac[1]] encrypted_key = a32_to_base64(encrypt_key(key, self.master_key)) #update attributes data = self.api_request({'a': 'p', 't': dest, 'n': [{ 'h': completion_file_handle, 't': 0, 'a': encrypt_attribs, 'k': encrypted_key}]}) #close input file and return API msg input_file.close() return data def create_folder(self, name, dest=None): #determine storage node if dest is None: #if none set, upload to cloud drive node if not hasattr(self, 'root_id'): self.get_files() dest = self.root_id #generate random aes key (128) for folder ul_key = [random.randint(0, 0xFFFFFFFF) for r in range(6)] #encrypt attribs attribs = {'n': name} encrypt_attribs = base64_url_encode(encrypt_attr(attribs, ul_key[:4])) encrypted_key = a32_to_base64(encrypt_key(ul_key[:4], self.master_key)) #update attributes data = self.api_request({'a': 'p', 't': dest, 'n': [{ 'h': 'xxxxxxxx', 't': 1, 'a': encrypt_attribs, 'k': encrypted_key} ], 'i': self.request_id}) #return API msg return data