DCCONSTRUCTIONS
0ca7316a24
Capture the current unreleased K1 connection, recovery, lifecycle, viewer, and test work as a single known-bad baseline for subsequent fixes.
50 lines
1.6 KiB
Python
50 lines
1.6 KiB
Python
from __future__ import annotations
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import re
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from pathlib import Path
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from fastapi.staticfiles import StaticFiles
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from starlette.responses import Response
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from starlette.types import Scope
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HTML_NO_STORE = "no-store"
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HASHED_ASSET_IMMUTABLE = "public, max-age=31536000, immutable"
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_MODULE_SCRIPT = re.compile(
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r'<script\b[^>]*\bsrc=["\'](?P<src>/assets/[^"\']+)["\'][^>]*>',
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re.IGNORECASE,
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)
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_HASHED_ASSET = re.compile(
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r"^assets/(?:.+)-[A-Za-z0-9_-]{8,}\.[A-Za-z0-9]+$",
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)
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def frontend_build_id(frontend_root: Path) -> str | None:
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"""Return the exact content-hashed module loaded by the current index."""
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try:
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index = (frontend_root / "index.html").read_text(encoding="utf-8")
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except OSError:
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return None
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for match in _MODULE_SCRIPT.finditer(index):
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source = match.group("src")
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if _HASHED_ASSET.fullmatch(source.removeprefix("/")):
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return source
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return None
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class ControlStationStaticFiles(StaticFiles):
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"""Serve the SPA shell fresh while retaining immutable hashed assets."""
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async def get_response(self, path: str, scope: Scope) -> Response:
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response = await super().get_response(path, scope)
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if response.status_code >= 400:
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return response
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content_type = response.headers.get("content-type", "").lower()
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normalized = path.lstrip("/")
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if content_type.startswith("text/html"):
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response.headers["Cache-Control"] = HTML_NO_STORE
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elif _HASHED_ASSET.fullmatch(normalized):
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response.headers["Cache-Control"] = HASHED_ASSET_IMMUTABLE
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return response
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