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51 lines
2.1 KiB
Python
51 lines
2.1 KiB
Python
from typing import Any
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from starlette.exceptions import HTTPException
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from starlette.responses import Response
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from starlette.staticfiles import StaticFiles
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from starlette.types import Scope
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class NoCacheStaticFiles(StaticFiles):
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"""
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This class is used to override the default caching behavior of starlette for static files,
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ensuring we *never* cache static files. It modifies the file response headers to strictly
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never cache the files.
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Static files include the javascript bundles, fonts, locales, and some images. Generated
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images are not included, as they are served by a router.
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This class also implements proper SPA (Single Page Application) routing by serving index.html
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for any routes that don't match static files, enabling client-side routing to work correctly
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in production builds.
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"""
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def __init__(self, *args: Any, **kwargs: Any):
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self.cachecontrol = "max-age=0, no-cache, no-store, , must-revalidate"
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self.pragma = "no-cache"
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self.expires = "0"
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super().__init__(*args, **kwargs)
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def file_response(self, *args: Any, **kwargs: Any) -> Response:
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resp = super().file_response(*args, **kwargs)
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resp.headers.setdefault("Cache-Control", self.cachecontrol)
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resp.headers.setdefault("Pragma", self.pragma)
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resp.headers.setdefault("Expires", self.expires)
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return resp
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async def get_response(self, path: str, scope: Scope) -> Response:
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"""
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Override get_response to implement SPA routing.
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When a file is not found and html mode is enabled, serve index.html instead of raising a 404.
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This allows client-side routing to work correctly in SPAs.
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"""
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try:
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return await super().get_response(path, scope)
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except HTTPException as exc:
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# If the file is not found (404) and html mode is enabled, serve index.html
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# This allows client-side routing to handle the path
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if exc.status_code == 404 and self.html:
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return await super().get_response("index.html", scope)
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raise
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