mirror of
https://github.com/LonamiWebs/Telethon.git
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76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
import base64
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import ipaddress
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import struct
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from .abstract import Session
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from .memory import MemorySession
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from ..crypto import AuthKey
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_STRUCT_PREFORMAT = '>B{}sH256s'
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CURRENT_VERSION = '1'
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class _AsyncString(str):
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"""
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Ugly hack to enable awaiting strings.
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"""
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def __await__(self):
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yield
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return self
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class StringSession(MemorySession):
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"""
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This session file can be easily saved and loaded as a string. According
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to the initial design, it contains only the data that is necessary for
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successful connection and authentication, so takeout ID is not stored.
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It is thought to be used where you don't want to create any on-disk
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files but would still like to be able to save and load existing sessions
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by other means.
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You can use custom `encode` and `decode` functions, if present:
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* `encode` definition must be ``def encode(value: bytes) -> str:``.
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* `decode` definition must be ``def decode(value: str) -> bytes:``.
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"""
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def __init__(self, string: str = None):
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super().__init__()
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if string:
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if string[0] != CURRENT_VERSION:
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raise ValueError('Not a valid string')
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string = string[1:]
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ip_len = 4 if len(string) == 352 else 16
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self._dc_id, ip, self._port, key = struct.unpack(
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_STRUCT_PREFORMAT.format(ip_len), StringSession.decode(string))
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self._server_address = ipaddress.ip_address(ip).compressed
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if any(key):
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self._auth_key = AuthKey(key)
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@staticmethod
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def encode(x: bytes) -> str:
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return base64.urlsafe_b64encode(x).decode('ascii')
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@staticmethod
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def decode(x: str) -> bytes:
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return base64.urlsafe_b64decode(x)
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def save(self: Session):
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# save should be async but that would break code which relies on sync StringSession.
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# Return a type which behaves like a string for all intents and purposes, but can be awaited.
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# The await is necessary for the library to save all sessions in the same way.
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if not self.auth_key:
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return _AsyncString('')
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ip = ipaddress.ip_address(self.server_address).packed
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return _AsyncString(CURRENT_VERSION + StringSession.encode(struct.pack(
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_STRUCT_PREFORMAT.format(len(ip)),
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self.dc_id,
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ip,
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self.port,
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self.auth_key.key
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)))
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