如何将外部swagger json文件链接到Python FastAPI？

from fastapi import FastAPI
from fastapi.openapi.utils import get_openapi
from fastapi.openapi.docs import get_redoc_html, get_swagger_ui_html
from fastapi.staticfiles import StaticFiles

app = FastAPI()

@app.get("/swagger.json")
async def get_swagger():
    # 从外部链接获取swagger JSON文件
    # 这里可以使用第三方库或自定义函数来获取JSON文件内容
    swagger_json = get_external_swagger_json()
    return swagger_json

app.mount("/docs", StaticFiles(directory="path/to/swagger_ui"), name="swagger_ui")
app.mount("/redoc", StaticFiles(directory="path/to/redoc"), name="redoc")

@app.get("/openapi.json")
async def get_openapi_endpoint():
    return get_openapi(
        title="Your API Title",
        version="1.0.0",
        routes=app.routes,
    )

@app.get("/docs", include_in_schema=False)
async def get_docs():
    return get_swagger_ui_html(openapi_url="/openapi.json", title="Your API Title")

@app.get("/redoc", include_in_schema=False)
async def get_redoc():
    return get_redoc_html(openapi_url="/openapi.json", title="Your API Title")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)