Check credentials and create a session

bin/setpasswd

@@ -5,6 +5,9 @@ require "fileutils"
 require "io/console"
 require "securerandom"
 
+DATA_DIR = File.join(__dir__, "../data")
+USER_FILE = File.join(DATA_DIR, "user.txt")
+
 print "User name: "
 username = $stdin.gets.chomp
 
@@ -16,14 +19,11 @@ end
 print "Password: "
 password = $stdin.noecho(&:gets).chomp
 
-user_path = File.join(File.dirname(__FILE__), "../user.txt")
-
-salt = SecureRandom.random_bytes(8)
-salthex = salt.chars.map {|c| sprintf("%02X", c.ord)}.join
+salt = SecureRandom.hex(8)
 input = salt + password
 hash = Digest::SHA256.hexdigest(input)
 hashhex = hash.chars.map {|c| sprintf("%02X", c.ord)}.join
-user_file_contents = "#{username}:#{salthex}:#{hashhex}\n"
+user_file_contents = "#{username}:#{salt}:#{hashhex}\n"
 
-File.binwrite(user_path, user_file_contents)
+File.binwrite(USER_FILE, user_file_contents)
 puts "User and password set"