with CGI, How to have multiple usernames and passwords from a txt file (password.txt) file

theravadamonk has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks,

with CGI, I want to have multiple usernames and passwords from a password.txt file.

In front end I have a login form login.html.

here it is


<HTML>
<HEAD>
<TITLE>Verifying a username and a password.</TITLE>
</HEAD>
<BODY>
      Type in your username and password below.
   <FORM ACTION = "/cgi-bin/login.cgi" METHOD = "POST">
   Username:<INPUT SIZE = "40" NAME = "USERNAME"><br>
   Password:<INPUT SIZE = "40" NAME = "PASSWORD" TYPE = PASSWORD><br>
   <INPUT TYPE = "SUBMIT" VALUE = "Enter">
   </FORM>
</BODY>
</HTML>
[download]

here's my login.cgi code


#!/usr/bin/perl
use CGI qw(:standard);
use strict;
use warnings;

my $var_username = param( "USERNAME" );
my $var_password = param( "PASSWORD" );

my $url="http://host.redirectdomain.com:9999/";
my $t=1; # time until redirect activates

print "Content-Type: text/html; charset=utf-8\n\n";

open ( FILE, "/tmp/password.txt" ) || die "The file could not be opene
+d";

while ( my $line = <FILE> )
{
   chomp $line;
   ( my $username, my $password ) = split( ",", $line );
   
   if ( ( $var_username eq $username ) && ( $var_password eq $password
+ ) ) {
   print "$var_username, $var_password <br>"; # I will remove this in 
+real world
   print "Permission has been granted <br>";
   print "<META HTTP-EQUIV=refresh CONTENT=\"$t;URL=$url\">\n";
   }
   
   elsif ( ( $var_username eq $username ) && ( $var_password ne $passw
+ord ) ) {
   print "$var_username, $var_password <br>"; # I will remove this in 
+real world
   print "You entered an invalid password. <br>";
   print "Access has been denied. <br>";
   }

   elsif ( ( $var_username ne $username ) && ( $var_password eq $passw
+ord ) ) {
   print "$var_username, $var_password <br>"; # I will remove this in 
+real world
   print "You entered an invalid username. <br>";
   print "Access has been denied. <br>";
   }

   else{
   print "$var_username, $var_password <br>"; # I will remove this in 
+real world
   print "You were denied access to this server. <br>";
   }

}
close( FILE );
[download]

here's my /tmp/password.txt file

account1,password1
[download]

this works for a Single username and passowrd.

When I have multiple usernames and passwords in this way

account1,password1
account2,password2
account3,password3
[download]

It check all. The question is if I type username as account1 and password as let's say pass, It prints "You entered an invalid password" and "You were denied access to this server". when I give correct username and password, it redirects as expected but prints the latter else statement. These are issues. If INPUTS are Wrong, How can I have single error message instead of multiple errors. If INPUTS are right, How can I have single message like "Permission has been granted" and redirection to the url

How to solve this? I DO need multiple usernames and passwords

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