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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 -*-
"""音频直链多重防护(HMAC 签名 + 时效 + 代理流)——框架无关。
密钥来源为**启动时注入**(`init_secret_key`),不依赖任何 Web 框架;
签名与校验算法逐字保持与历史实现一致,
故存量客户端已持有的直链 token 仍然有效。
"""
import base64
import hashlib
import hmac
import secrets
import time
from typing import Any
from core.config import AUDIO_HOST_MARKS, AUDIO_TOKEN_TTL, AUDIO_URL_KEYS
# 由应用启动时注入(来源:auth_system.get_secret_key() → app.secret_key)
_SECRET_KEY: bytes = b''
def init_secret_key(key) -> None:
"""注入签名密钥(str 或 bytes)。须在生成/校验音频 token 前调用一次。"""
global _SECRET_KEY
_SECRET_KEY = key.encode('utf-8') if isinstance(key, str) else key
def is_audio_url(v) -> bool:
return isinstance(v, str) and v.startswith('http') and any(m in v for m in AUDIO_HOST_MARKS)
def sign_payload(payload: str) -> str:
return hmac.new(_SECRET_KEY, payload.encode('utf-8'), hashlib.sha256).hexdigest()[:32]
def make_audio_token(url: str) -> str:
exp = int(time.time()) + AUDIO_TOKEN_TTL
nonce = secrets.token_hex(4)
payload = base64.urlsafe_b64encode(f'{exp}|{nonce}|{url}'.encode()).decode().rstrip('=')
return payload + '.' + sign_payload(payload)
def verify_audio_token(token: str) -> str | None:
try:
payload, sig = token.rsplit('.', 1)
if not hmac.compare_digest(sig, sign_payload(payload)):
return None
pad = '=' * (-len(payload) % 4)
exp, _nonce, url = base64.urlsafe_b64decode(payload + pad).decode('utf-8').split('|', 2)
if int(exp) < time.time():
return None
return url
except Exception:
return None
def protect_audio_urls(obj: Any) -> bool:
"""递归就地替换 dict/list 中的音频直链为签名代理地址,返回是否发生替换"""
hit = {'v': False}
def walk(o):
if isinstance(o, dict):
for k, v in list(o.items()):
if k in AUDIO_URL_KEYS and is_audio_url(v):
o[k] = '/audio_stream?token=' + make_audio_token(v)
hit['v'] = True
else:
walk(v)
elif isinstance(o, list):
for it in o:
walk(it)
walk(obj)
return hit['v']