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snowy-yang ad8c30d932 refactor: 下载/标签/格式探测改用成熟库(aria2 + mutagen + filetype)
为什么:原先三处都在手写轮子——ffmpeg CLI 拼参数写标签、aiohttp 单连接手搓
下载、自己比对魔数判格式。手写部分既难测又易错;改走成熟库后测试从 144 涨到
175,并且彻底去掉了 ffmpeg 这个外部二进制依赖。

下载 → aria2c 常驻 JSON-RPC(aria2p 客户端),新增 _aria2.py
- 单例后端:首次调用时拉起 aria2c,只监听 127.0.0.1 且强制随机 secret
  (无鉴权的 aria2 RPC 允许本机任意进程操纵队列、读写任意文件)
- split=5 / max-connection-per-server=5 多连接 + 原生断点续传
- 异常语义与内置通道逐一对齐:取消/超限清残片抛 DownloadCanceled /
  DownloadException,任务失败/超时保留残片抛 RequestException 供续传
- 取不到 aria2c 时 get_backend() 返回 None,自动降级到内置 aiohttp 通道
  (本机无 aria2c 的降级路径已实测)

标签 → mutagen 纯 Python 写入,新增 tagging.py
- 取代 _write_metadata_with_ffmpeg + _build_format_args(226 行 shell 参数拼接)
- MP3(ID3v2.3)/FLAC/M4A/OGG/Opus 分容器实现,无子进程、不重编码
- 就地改帧:TXXX 等未触及的标签原样保留(ffmpeg 整帧重写会丢)
- 临时文件 + os.replace 原子替换,写坏不会留下半个文件
- 为什么不是 ffmpeg-python(原方案):实测它用 **kwargs 建模选项,无法表达
  重复键(-metadata ×N),list 值还会被字符串化成 "['0', '1:v']";-map 尚有
  内置的 stream 位置参数入口,但 -metadata 无解,且 overwrite_output=True
  生成的 -y 被排到输出文件之后、可能失效

格式探测 → filetype,改 _http.py
- 删除手写的 _AUDIO_MAGIC 魔数表,改用 filetype.guess() 判 MIME
  (audio/* 放行,video/mp4 作为容器显式放行)

配套
- Dockerfile:镜像不再装 ffmpeg,改装 aria2
- pyproject:新增 filetype / aria2p / mutagen;dev 加 httpx2(消除测试里的
  StarletteDeprecationWarning,现 0 warning)
- __main__.py / __init__.py / models.py:清理 ffmpeg 相关导出与文案

测试:新增 31 个用例(test_aria2.py 13、test_tagging.py 21,含最小合法 FLAC
样本构造);全套 175 passed / 0 warning
2026-09-26 13:54:44 +08:00

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# -*- coding: utf-8 -*-
[project]
name = "yunmusic-assistant"
version = "3.0.0"
description = "云村小助手 · 网易云音乐解析/下载服务(FastAPI + asyncio + aiohttp)"
requires-python = ">=3.12"
dependencies = [
"fastapi>=0.115,<1.0",
"uvicorn[standard]>=0.30,<1.0",
"aiohttp>=3.10,<4.0",
"aiosqlite>=0.20,<1.0",
"aiofiles>=24.1",
"itsdangerous>=2.2,<3.0",
"cryptography>=50.0,<51.0",
"qrcode>=7.0,<8.3",
"python-multipart>=0.0.9",
"jinja2>=3.1,<4.0",
"filetype>=1.2.0",
"aria2p>=0.12.1",
"mutagen>=1.48.1",
]
[dependency-groups]
dev = [
"pytest>=8.0",
"pytest-asyncio>=0.24",
"ruff>=0.6",
"pyright>=1.1.390",
"httpx>=0.27",
"httpx2>=2.13.1",
]
# 应用工程(非库):不把自身装进环境,避免 uv 扫描顶层模块
[tool.uv]
package = false
# ============ Ruff:静态检查 + 导入排序 + 格式化 ============
[tool.ruff]
target-version = "py312"
line-length = 120
extend-exclude = [".venv", ".zcode", "templates", "static", "data"]
[tool.ruff.lint]
# E/F 基础错误、I 导入排序、B bugbear、UP 升级、C4 推导式、ASYNC 异步陷阱、S 安全、RUF
select = ["E", "F", "W", "I", "B", "UP", "C4", "ASYNC", "S", "RUF"]
ignore = [
"E501", # 行宽交给 formatter,不强制
"S101", # 生产代码外的 assert(测试/断言脚本)
"S104", # 绑定 0.0.0.0(服务端有意为之)
"S110", # try/except/pass(本项目「失败静默降级」策略)
"S112", # try/except/continue
"S324", # hashlib.md5 用于非安全场景(上游签名口径)
"S603", "S607", # subprocess(打包/运维脚本)
"UP009", # 保留 `# -*- coding: utf-8 -*-` 文件头(全项目既有约定)
"RUF001", "RUF002", "RUF003", # 全角字符(中文注释/文案,误报)
# ---- 以下为「有意保留」,已被逐条论证为协议/设计约束,非待修缺陷 ----
"RUF012", # 常量类可变默认值:APIConstants/PodcastConstants 是常量表,非实例状态
"S305", # AES-ECB:网易云 weapi 协议**要求**的加密模式,非可自由选择
"S311", # randrange:生成上游 requestId(协议随机数),非安全用途
"ASYNC250", # input():qr_login 交互式 CLI 的人类输入,异步化无意义
"S310", # urllib:仅用于音频 Range 代理的 URL 校验路径
]
[tool.ruff.lint.per-file-ignores]
"tests/**" = ["S", "ASYNC"]
".zcode/**" = ["S", "ASYNC", "F"]
# ASYNC109:timeout 参数是有意 API——直接转发给 aiohttp 的 ClientTimeout,
# 不是「用 sleep 当超时」的反模式。
"core/http_client.py" = ["ASYNC109"]
"core/aiohttp_compat.py" = ["ASYNC109"]
[tool.ruff.lint.isort]
known-first-party = ["core", "web", "services", "music_api", "auth_system", "music_downloader"]
[tool.ruff.format]
quote-style = "preserve"
# ============ Pyright:类型检查 ============
[tool.pyright]
# 全量纳入(Flask 巨石删除后不再有例外清单)
# 顶层模块与 tests 此前不在名单里——「pyright 0 错误」只覆盖了 core/web/services,
# 而 requests→sync_http 迁移的遗留恰好全部躲在漏检的顶层模块中,故补齐。
include = [
"core",
"web",
"services",
"tests",
"music_api",
"auth_system",
"music_downloader",
"podcast_api.py",
"qr_login.py",
"_mkpkg.py",
]
exclude = [".venv", ".zcode", "data", "downloads", "templates", "static"]
venvPath = "."
venv = ".venv"
pythonVersion = "3.12"
typeCheckingMode = "standard"
reportMissingImports = true
# standard 比 basic 多出「变量可能未绑定 / 实参类型不符 / 无意义重定义 / 未使用符号」
# 等**可执行缺陷**(basic 全部漏报,实测 standard 多报 7 处真实缺陷),
# 故作为门禁级别;strict 的 reportUnknown* 需要给全部第三方库补存根,暂不启用。
# 以下三项在 standard 下已由类型系统覆盖,降为 warning 以避免第三方存根不全的噪声
reportOptionalMemberAccess = "warning"
reportAttributeAccessIssue = "warning"
# ============ Pytest ============
[tool.pytest.ini_options]
asyncio_mode = "auto"
testpaths = ["tests"]
addopts = "-q"
# 本工程不装进环境(package = false),且 tests/ 无 __init__.py,
# 故必须显式把项目根加入 import 路径——否则裸跑 `pytest` 时
# `import core` 必然 ModuleNotFoundError(只有 `python -m pytest` 才碰巧能用)。
pythonpath = ["."]