Time for action – writing a helper program

So, let's write a dummy Python script that can act as a Basic authentication helper:

#!/usr/bin/env python

import sys
 
def validate_credentials(username, password):
  """
  Returns True if the username and password are valid. 
  False otherwise
  """
  # Write your own function definition.
  # Use mysql, files, /etc/passwd or some service you want
  return False

if __name__ == '__main__':
  while True:
    # Read a line from stdin
    line = sys.stdin.readline()
    # Remove '\n' from line
    line = line.strip()

    # Check if string contains two entities
    parts = line.split(' ', 1)
    if len(parts) == 2:
        # Extract username and password from line
        username, password = parts
        # Check if username and password are valid
        if validate_credentials(username, password):
            sys.stdout.write('OK\n')
        else:
            sys.stdout.write('ERR Wrong username or password\n')
    else:
        # Unexpected input...