FastAPI从入门到实战（13）——全局依赖

from typing import Optional

from fastapi import APIRouter, Header, HTTPException, Depends

# app13 = APIRouter()


"""Global Dependencies 全局依赖"""


async def verify_token(x_token: str = Header(...)):
    """没有返回值的子依赖"""
    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(...)):
    """有返回值的子依赖，但是返回值不会被调用"""
    if x_key != "fake-super-secret-key":
        raise HTTPException(status_code=400, detail="X-Key header invalid")
    return x_key


app13 = APIRouter(dependencies=[Depends(verify_token), Depends(verify_key)])


@app13.get("/dependency_in_path_operation",
           dependencies=[Depends(verify_token), Depends(verify_key)])  # 这时候不是在函数参数中调用依赖，而是在路径操作中
async def dependency_in_path_operation():
    return [{"user": "user01"}, {"user": "user02"}]


# 给了默认值就是选填的参数，没给默认值就是必填参数
@app13.get("/query")
def page_limit(page: int = 1, limit: Optional[int] = None):
    if limit:
        return {"page": page, "limit": limit}
    return {"page": page}