I became completely obsessed with coding when I was fifteen.

When I was 15, I was completely obsessed with coding, and back then I thought an authentication system required a thousand lines of code.

I don’t know if everyone is like this, but I tend to imagine anything that seems mysterious as extremely complex and difficult, pushing myself back before I even start.

But after three years in backend development and a year in cybersecurity, I realized—why was it actually so simple?

This is a sample code for authentication using FastAPI.

from fastapi import FastAPI
import bcrypt

app=FastAPI()
#Call the known database user_info_user_data to retrieve the user hash
@app.get("/data/{data_user}")
def user_data(data_user:str):
    #Assume the database function is user_info_user_data
    user_info=user_info_user_data(data_user)
    return {"user_info":user_info}
#→ Verify the password hash
#Assume the user input function is user_input_
def hash_(user_input,user_data):
    user_input=user_input
    user_data=user_data()
    return bcrypt.checkpw(user_input.encode('utf-8'), user_data)

It’s obvious that I cut corners in this sample code.

You can tell my personality from this: I’m extremely prone to procrastination and really like to avoid things.

The truth is, this blog post should have been published three days ago, but I only finished writing and posting it today.

Ok, enough chatter—let’s return to the core of our blog post: authentication.