在node.js中循环登录提示？

Question

I wasn't quite sure how to title this question, open to edits.

This is what I am currently using for the login system.

if (accountq === "Add", " Add", " Add "){
    var usrin = prompt("Username: ")
}

if (usrin === usrname){
    var passin = prompt("Ah, hello. Password?: ")
}

do {  
    if (passin !== pswdb){
       var passin = prompt("Sorry, that pass does not match.")
    }
}
while(passin === pswdb){
    console.log("Username and password have been authenticated")
    var addname = prompt("Name: ")
    console.log(
        "Okay, noted that. Please give us the direct download link"
    )

    var directlink = prompt("Direct Link: ")
    console.log("Thank you! Will add that.")
} 

while(passin !== pswdb){
    wrongpass()
} //this was my attempt to trigger the prompt again, but it failed.

I am trying to prompt for a password until a correct password is entered, and then go on to the rest of the code, I've tried while, but with no luck, can someone point me in the correct direction.

Answer 1

How about this? It's simple, small, and seems similar to your attempted solution:

var prompt = require('prompt-sync')()

var expectedPass = 'myPassword'

while (true) {
  var username = prompt('Username:')
  var password = prompt('Password:')
  if (password == expectedPass) break
  else console.log('Sorry, that pass does not match.')
}

console.log('Match!')

/* ... rest of code ... */

Please note the following security and performance bits:

1. prompt-sync is a blocking prompt, which means any other asyncronous activities will be blocked until the user responds. This won't be a prompt unless you're doing other things in this process.

2. Security-wise, a user could simply open the file and read the password to get around this security prompt.

If either of these are problems, then you may be looking for a different solution. Let me know if that's the case!