How can I implement time-based login authentication for users in asp.net core using active code?

I am looking for a system where a unique code is sent to the user, allowing them to log in within a 3-minute window. The code should only be usable once during this time frame to prevent multiple requests by the user.

Answer №1

David gave some great advice - tackle the code first and seek help when you hit roadblocks.

If you have specific requirements, I can offer some suggestions.

  1. Initially, it's important to understand that when the browser client connects to the asp.net core webserver, a session ID is created upon connection establishment.

  2. We can customize the codeState in session to verify if the connecting user has logged in.

    code            string type: 0123 or Az02
    
    codeState       null ->  not generated
                    -1   ->  expired
                    0    ->  generated but un-used
                    1    ->  used
    

    if(codeState=null){
        code = generate_code();
        HttpContext.Session.SetString("code",code);
    }
    if(codeState == -1){
        msg = "The code has expired, please click the button to generate a new code";
    }
    if(codeState== 0){
        msg = "The code has been generated";
        code = HttpContext.Session.GetString("code");
    }
    if(codeState== 1){
        msg = "The code has already been used";
    }
    

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