全局依赖项¶
有时，我们要为整个应用添加依赖项。
通过与定义路径装饰器依赖项 类似的方式，可以把依赖项添加至整个 FastAPI 应用。
这样一来，就可以为所有路径操作应用该依赖项：
from fastapi import Depends, FastAPI, Header, HTTPException
async def verify_token(x_token: str = Header()):
if x_token != "fake-super-secret-token":
raise HTTPException(status_code=400, detail="X-Token header invalid")
async def verify_key(x_key: str = Header()):
if x_key != "fake-super-secret-key":
raise HTTPException(status_code=400, detail="X-Key header invalid")
return x_key
app = FastAPI(dependencies=[Depends(verify_token), Depends(verify_key)])
@app.get("/items/")
async def read_items():
return [{"item": "Portal Gun"}, {"item": "Plumbus"}]
@app.get("/users/")
async def read_users():
return [{"username": "Rick"}, {"username": "Morty"}]
🤓 Other versions and variants
from fastapi import Depends, FastAPI, Header, HTTPException
from typing_extensions import Annotated
async def verify_token(x_token: Annotated[str, Header()]):
if x_token != "fake-super-secret-token":
raise HTTPException(status_code=400, detail="X-Token header invalid")
async def verify_key(x_key: Annotated[str, Header()]):
if x_key != "fake-super-secret-key":
raise HTTPException(status_code=400, detail="X-Key header invalid")
return x_key
app = FastAPI(dependencies=[Depends(verify_token), Depends(verify_key)])
@app.get("/items/")
async def read_items():
return [{"item": "Portal Gun"}, {"item": "Plumbus"}]
@app.get("/users/")
async def read_users():
return [{"username": "Rick"}, {"username": "Morty"}]
from fastapi import Depends, FastAPI, Header, HTTPException
from typing_extensions import Annotated
async def verify_token(x_token: Annotated[str, Header()]):
if x_token != "fake-super-secret-token":
raise HTTPException(status_code=400, detail="X-Token header invalid")
async def verify_key(x_key: Annotated[str, Header()]):
if x_key != "fake-super-secret-key":
raise HTTPException(status_code=400, detail="X-Key header invalid")
return x_key
app = FastAPI(dependencies=[Depends(verify_token), Depends(verify_key)])
@app.get("/items/")
async def read_items():
return [{"item": "Portal Gun"}, {"item": "Plumbus"}]
@app.get("/users/")
async def read_users():
return [{"username": "Rick"}, {"username": "Morty"}]
路径装饰器依赖项 一章的思路均适用于全局依赖项， 在本例中，这些依赖项可以用于应用中的所有路径操作。
为一组路径操作定义依赖项¶
稍后，大型应用 - 多文件一章中会介绍如何使用多个文件创建大型应用程序，在这一章中，您将了解到如何为一组路径操作声明单个 dependencies 参数。