How to add a custom decorator to a fastapi route?

@daisha 

To add a custom decorator to a FastAPI route, you can create a function that defines the custom decorator and then use the Depends class from FastAPI to apply it to the route. Here is an example of how you can add a custom decorator to a FastAPI route:

1. Define the custom decorator function:

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from fastapi import HTTPException

def custom_decorator(func):
    def wrapper(*args, **kwargs):
        # Custom logic here
        if some_condition:
            raise HTTPException(status_code=403, detail="Not authorized")
        return func(*args, **kwargs)
    return wrapper

1. Apply the custom decorator to a FastAPI route:

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from fastapi import FastAPI, Depends

app = FastAPI()

@app.get("/items/", dependencies=[Depends(custom_decorator)])
async def read_items():
    return {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}

In this example, the custom_decorator function is defined to perform some custom logic before executing the route handler. The Depends class is used to apply the custom decorator to the read_items route.

By using custom decorators in this way, you can easily add additional logic or validation to your FastAPI routes.