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34 lines
1.0 KiB
Python
34 lines
1.0 KiB
Python
from fastapi import FastAPI
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from fastapi.openapi.docs import get_redoc_html
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def add_redoc_endpoint(
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app: FastAPI,
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*,
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redoc_url: str | None,
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openapi_url: str | None,
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title: str | None,
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) -> None:
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"""Attach a ReDoc endpoint if docs are enabled.
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The default FastAPI ReDoc handler sometimes renders a blank page when the
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CDN bundle fails to load. By explicitly registering the handler and
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pinning the bundle version, we ensure the endpoint always returns a fully
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rendered page.
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"""
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if not redoc_url or not openapi_url:
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return
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for route in app.router.routes:
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if getattr(route, "path", None) == redoc_url:
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return
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@app.get(redoc_url, include_in_schema=False)
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async def redoc_html(): # pragma: no cover - template rendering
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return get_redoc_html(
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openapi_url=openapi_url,
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title=f"{title or app.title} - ReDoc",
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redoc_js_url="https://cdn.jsdelivr.net/npm/redoc@2.1.5/bundles/redoc.standalone.js",
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)
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