mirror of
https://github.com/Sneed-Group/pypush-plus-plus
synced 2024-12-24 11:52:27 -06:00
141 lines
No EOL
4.2 KiB
Python
141 lines
No EOL
4.2 KiB
Python
from __future__ import annotations
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import courier, albert
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from hashlib import sha1
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def _serialize_field(id: int, value: bytes) -> bytes:
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return id.to_bytes() + len(value).to_bytes(2, "big") + value
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def _serialize_payload(id: int, fields: list[(int, bytes)]) -> bytes:
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payload = b""
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for fid, value in fields:
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if fid is not None:
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payload += _serialize_field(fid, value)
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return id.to_bytes() + len(payload).to_bytes(4, "big") + payload
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def _deserialize_field(stream: bytes) -> tuple[int, bytes]:
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id = int.from_bytes(stream[:1], "big")
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length = int.from_bytes(stream[1:3], "big")
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value = stream[3 : 3 + length]
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return id, value
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# Note: Takes a stream, not a buffer, as we do not know the length of the payload
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# WILL BLOCK IF THE STREAM IS EMPTY
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def _deserialize_payload(stream) -> tuple[int, list[tuple[int, bytes]]] | None:
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id = int.from_bytes(stream.read(1), "big")
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if id == 0x0:
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return None
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length = int.from_bytes(stream.read(4), "big")
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buffer = stream.read(length)
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fields = []
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while len(buffer) > 0:
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fid, value = _deserialize_field(buffer)
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fields.append((fid, value))
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buffer = buffer[3 + len(value) :]
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return id, fields
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def _deserialize_payload_from_buffer(buffer: bytes) -> tuple[int, list[tuple[int, bytes]]] | None:
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id = int.from_bytes(buffer[:1], "big")
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if id == 0x0:
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return None
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length = int.from_bytes(buffer[1:5], "big")
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buffer = buffer[5:]
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if len(buffer) < length:
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raise Exception("Buffer is too short")
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fields = []
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while len(buffer) > 0:
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fid, value = _deserialize_field(buffer)
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fields.append((fid, value))
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buffer = buffer[3 + len(value) :]
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return id, fields
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# Returns the value of the first field with the given id
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def _get_field(fields: list[tuple[int, bytes]], id: int) -> bytes:
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for field_id, value in fields:
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if field_id == id:
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return value
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return None
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class APNSConnection:
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def __init__(self, private_key=None, cert=None):
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# Generate the private key and certificate if they're not provided
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if private_key is None or cert is None:
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self.private_key, self.cert = albert.generate_push_cert()
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else:
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self.private_key, self.cert = private_key, cert
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self.sock = courier.connect(self.private_key, self.cert)
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def connect(self, token: bytes = None):
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if token is None:
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payload = _serialize_payload(7, [(2, 0x01.to_bytes())])
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else:
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payload = _serialize_payload(7, [(1, token), (2, 0x01.to_bytes())])
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self.sock.write(payload)
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payload = _deserialize_payload(self.sock)
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if payload == None or payload[0] != 8 or _get_field(payload[1], 1) != 0x00.to_bytes():
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raise Exception("Failed to connect")
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self.token = _get_field(payload[1], 3)
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def filter(self, topics: list[str]):
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fields = [(1, self.token)]
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for topic in topics:
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fields.append((2, sha1(topic.encode()).digest()))
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payload = _serialize_payload(9, fields)
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self.sock.write(payload)
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def send_message(self, token: bytes, topic: str, payload: str):
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# Current time in UNIX nanoseconds
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import time
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# Expire in 5 minutes
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expiry = int(time.time()) + 500
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payload = _serialize_payload(0x0a,
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[(1, sha1(topic.encode()).digest()),
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(2, token),
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(3, payload.encode("utf-8")),
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(4, (3864024149).to_bytes(4, "big")),
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(5, expiry.to_bytes(4, "big")),
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(6, time.time_ns().to_bytes(8, "big")),
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(7, 0x00.to_bytes()),
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(0xf, self.token)])
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print(payload)
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self.sock.write(payload)
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payload = _deserialize_payload(self.sock)
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print(payload)
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# TODO: Find a way to make this non-blocking
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def expect_message(self) -> tuple[int, list[tuple[int, bytes]]] | None:
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return _deserialize_payload(self.sock) |