Kris
a2201d8be3
新增完整的woc-bridge业务服务，实现微信API代理、密钥自动提取、消息队列限流等功能： 1. 新增bridge核心代码与s6服务配置 2. 新增ptrace权限初始化脚本与docker配置 3. 新增M2M鉴权API代理与环境变量配置 4. 新增SQLCipher解密、密钥缓存、二维码截图等工具模块 5. 完善docker构建与实例部署配置
150 lines
4.9 KiB
Python
150 lines
4.9 KiB
Python
"""微信窗口二维码截图能力。
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封装屏幕截图（scrot）与二维码区域裁剪（Pillow），供
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/api/login/qr/start 与 /api/screenshot 使用。
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所有方法为 async，内部用 asyncio 子进程执行截图命令，避免阻塞
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event loop。
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"""
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from __future__ import annotations
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import asyncio
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import base64
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import io
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import os
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import tempfile
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from models import BridgeError
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class QrCapture:
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"""屏幕截图与二维码裁剪器。
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通过 scrot 截取整个 X11 屏幕，再用 Pillow 按比例裁剪出二维码
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所在区域（中央偏上）。
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"""
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# 二维码区域裁剪比例（spec 12.3 节，MVP 阶段固定为中央偏上区域）
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_QR_LEFT = 0.25
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_QR_TOP = 0.2
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_QR_RIGHT = 0.75
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_QR_BOTTOM = 0.7
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def __init__(self, display: str = ":1") -> None:
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"""保存 DISPLAY 环境变量值。
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Args:
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display: X server display 地址，如 ":1"
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"""
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self.display = display
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def _env(self) -> dict:
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"""返回带 DISPLAY 的环境副本。"""
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env = dict(os.environ)
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env["DISPLAY"] = self.display
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return env
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async def _run(self, args: list[str]) -> tuple[int, bytes, bytes]:
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"""执行一条命令并返回 (returncode, stdout, stderr)。"""
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proc = await asyncio.create_subprocess_exec(
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*args,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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env=self._env(),
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)
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stdout, stderr = await proc.communicate()
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return proc.returncode, stdout, stderr
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async def _capture_full_png(self, dest_path: str) -> None:
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"""用 `scrot <dest>` 截取整个屏幕到 PNG 文件。
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Args:
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dest_path: 目标 PNG 文件路径
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"""
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returncode, _, stderr = await self._run(
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["scrot", dest_path]
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)
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if returncode != 0 or not os.path.exists(dest_path):
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msg = stderr.decode(errors="ignore").strip() or "unknown error"
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raise BridgeError(
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code="BRIDGE_INTERNAL_ERROR",
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message=f"截图失败: {msg}",
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)
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async def capture_qr_code(self) -> str:
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"""截取并裁剪二维码区域，返回 data URL。
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流程：
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1. 截图整个屏幕到 /tmp 临时 PNG
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2. 用 Pillow 打开并按比例裁剪二维码区域
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3. 编码为 base64 data URL `data:image/png;base64,...`
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4. 删除临时文件
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5. 返回 data URL
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"""
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# 临时文件
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fd, tmp_path = tempfile.mkstemp(prefix="woc_qr_", suffix=".png")
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os.close(fd)
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try:
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await self._capture_full_png(tmp_path)
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# 用 Pillow 裁剪
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data_url = await asyncio.to_thread(self._crop_qr_to_data_url, tmp_path)
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return data_url
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finally:
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if os.path.exists(tmp_path):
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try:
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os.remove(tmp_path)
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except OSError:
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pass
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def _crop_qr_to_data_url(self, png_path: str) -> str:
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"""同步：打开 PNG，按比例裁剪二维码区域，返回 data URL。"""
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try:
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from PIL import Image # 局部导入，避免无 Pillow 时影响模块加载
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except ImportError as e:
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raise BridgeError(
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code="BRIDGE_INTERNAL_ERROR",
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message=f"Pillow 未安装: {e}",
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)
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try:
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with Image.open(png_path) as img:
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w, h = img.size
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left = int(w * self._QR_LEFT)
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top = int(h * self._QR_TOP)
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right = int(w * self._QR_RIGHT)
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bottom = int(h * self._QR_BOTTOM)
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cropped = img.crop((left, top, right, bottom))
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buf = io.BytesIO()
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cropped.save(buf, format="PNG")
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b64 = base64.b64encode(buf.getvalue()).decode("ascii")
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return f"data:image/png;base64,{b64}"
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except BridgeError:
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raise
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except Exception as e:
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raise BridgeError(
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code="BRIDGE_INTERNAL_ERROR",
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message=f"裁剪二维码失败: {e}",
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)
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async def capture_full_screenshot(self) -> bytes:
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"""截取完整屏幕，返回 PNG bytes（供 /api/screenshot 用）。"""
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fd, tmp_path = tempfile.mkstemp(prefix="woc_shot_", suffix=".png")
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os.close(fd)
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try:
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await self._capture_full_png(tmp_path)
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try:
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with open(tmp_path, "rb") as f:
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return f.read()
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except OSError as e:
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raise BridgeError(
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code="BRIDGE_INTERNAL_ERROR",
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message=f"读取截图文件失败: {e}",
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)
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finally:
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if os.path.exists(tmp_path):
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try:
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os.remove(tmp_path)
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except OSError:
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pass
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