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NeteaseUrl/core/session.py
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snowy-yang 6288a98ecc refactor: 拆分 4 个巨石模块为包,清理过时注释并删除作废文档
为什么:单文件 1100~1900 行的巨石模块让「改一处要通读全文」;同时注释里残留
大量已删台账的编号,以及「Flask/FastAPI 双栈迁移期」这类已失实的架构描述,
会误导后来者按不复存在的架构去改代码。

拆分(对外导入路径不变,行为零变更):
- music_downloader.py  -> music_downloader/(models/downloader/cover/_http/_log/_concurrency)
- auth_system.py       -> auth_system/(db/security/users/credits/ledger/mail/cards/backup...)
- music_api.py         -> music_api/(api/client/crypto/qr/cookies/compat/constants/errors)
- services/runtime.py  -> services/(api_service/_shared/_taskcore/downloads/batch/podcast/
  streaming/tasks);services/runtime.py 保留为兼容门面

兼容性做法:各包用 __init__.py 以 __all__ 原样再导出全部符号,既有调用点
(auth_system.xxx / services.xxx / from music_api import Y)零改动;路径常量改为经包属性
动态读取(auth_system.DB_PATH),否则测试的 monkeypatch 会静默失效并写到生产库。

修复 9 处代码损伤(上一轮注释清理把 `()` 当「空括号残留」删掉所致;用「与拆分前逐字
等价」校验逐一定位,静态检查只会报出其中 4 处):
- core/config.py  ).strip() or '*'
- core/state.py   threading.Lock() x2
- qr_login.py     datetime.now() / .strip()
- music_downloader/downloader.py  .lower()
- services/podcast.py  set() / time.time() x2

清理与删除:
- 删除 部署文档.md / 功能介绍.md / README_私有包警告.txt
- 清理指向已删台账与文档的过时编号注释;把「迁移期 / 两栈 / 双框架 / 已迁移」等
  失实描述改写为现状描述(保留 `<-> Flask /path` 映射表等仍有价值的契约来源说明)
- _mkpkg.py:公开包剔除清单去掉已不存在的文档名;私有包警告改为自包含
- pyproject.toml:补 pythonpath = ["."],使裸跑 pytest 不再 import core 失败

验证:ruff 全通过;pyright 0 errors / 0 warnings(102 文件);pytest 144 passed;
真实 uvicorn 冒烟 6 条路由符合预期且生产 data/ 指纹未变;忽略注释的逐字等价性校验通过。
2026-09-26 12:37:48 +08:00

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# -*- coding: utf-8 -*-
"""Flask 兼容的会话 Cookie 编解码(itsdangerous 签名格式)。
Flask 默认会话即 itsdangerous 签名 Cookie(`session` cookie,格式 `payload.timestamp.hmac`,
payload 为会话字典的 compact JSON;bytes/datetime/tuple 等类型会被 Flask 打上
单字符标签再包一层)。本站早期由 Flask 签发会话,为让**存量 Cookie 无需重新登录即可继续使用**,
本模块复刻同一套编解码(同格式、同密钥、同摘要算法)。
密钥同源:取自 auth_system.get_secret_key()(data/secret.key)。
"""
import base64
import hashlib
import hmac
import json
import time
from typing import Any
# 与 Flask 默认一致:SHA1 + itsdangerous 的 key derivation(HMAC(digest, salt))
_SALT = 'cookie-session'
_DIGEST = hashlib.sha1
SESSION_KEY = 'site_uid'
def _derive_key(secret: str, salt: str = _SALT) -> bytes:
"""itsdangerous 的密钥派生:HMAC(secret, salt)。"""
mac = hmac.new(secret.encode('utf-8'), salt.encode('utf-8'), _DIGEST)
return mac.digest()
def _int_to_bytes(num: int) -> bytes:
"""itsdangerous 时间戳编码:8 字节大端并去前导零(struct.pack('>Q') + lstrip)。"""
return num.to_bytes(8, 'big').lstrip(b'\x00') or b'\x00'
def dumps(secret: str, session: dict[str, Any]) -> str:
"""把会话字典序列化为 Flask/itsdangerous 兼容的签名 Cookie 值。"""
payload = base64.b64encode(
json.dumps(session, separators=(',', ':')).encode('utf-8')).decode('ascii')
ts = base64.b64encode(_int_to_bytes(int(time.time()))).decode('ascii').rstrip('=')
value = f'{payload}.{ts}'
sig = hmac.new(_derive_key(secret), value.encode('utf-8'), _DIGEST).digest()
return f'{value}.{base64.b64encode(sig).decode("ascii").rstrip("=")}'
def loads(secret: str, value: str) -> dict[str, Any] | None:
"""校验签名并解出会话字典;无效/被篡改返回 None。
注:Flask 的会话 JSON 采用「带空格」的 compact 编码(`{"a": 1}`),
解码时直接 json.loads 即可,两种空白形式都能解析。
"""
if not value:
return None
try:
payload, ts, sig = value.rsplit('.', 2)
except ValueError:
return None
value_no_sig = f'{payload}.{ts}'
expected = hmac.new(_derive_key(secret), value_no_sig.encode('utf-8'), _DIGEST).digest()
pad = '=' * (-len(sig) % 4)
try:
actual = base64.urlsafe_b64decode(sig + pad)
except Exception:
return None
if not hmac.compare_digest(expected, actual):
return None
pad_p = '=' * (-len(payload) % 4)
try:
raw = base64.urlsafe_b64decode(payload + pad_p)
data = json.loads(raw.decode('utf-8'))
except Exception:
return None
return data if isinstance(data, dict) else None
def get_uid(session: dict[str, Any] | None) -> int | None:
"""取会话中的站点用户 id(Flask 存的是 int,直接可用)。"""
if not session:
return None
val = session.get(SESSION_KEY)
return int(val) if val else None