input: Write a function to automate the process of dispensing beer based on user authentication, license validity, and blood alcohol content (BAC) level. The function should set up GPIO pins, import necessary modules, define operating modes, prompt for password and mode selection, check license validity and user registration, calculate BAC, and control the solenoid to dispense beer if the license is valid and the BAC is below the threshold. The function should also record swipe data in appropriate files. If the function encounters an error, it should print "error" and continue. The function should return True if the process completes successfully, else False.
  
  assert automate_beer_dispenser() == True
output: 
  def automate_beer_dispenser():
      try:
          import RPi.GPIO as GPIO
          import time
          import csv
          import hashlib
  
          GPIO.setmode(GPIO.BCM)
          GPIO.setup(18, GPIO.OUT)
  
          OPERATING_MODES = {
              '1': 'Normal',
              '2': 'Party',
              '3': 'Special'
          }
  
          PASSWORD = "1234"
          BAC_THRESHOLD = 0.08
  
          def check_license_validity(license_number):
              with open('licenses.csv', mode='r') as file:
                  reader = csv.reader(file)
                  for row in reader:
                      if row[0] == license_number:
                          return True
              return False
  
          def check_user_registration(user_id):
              with open('users.csv', mode='r') as file:
                  reader = csv.reader(file)
                  for row in reader:
                      if row[0] == user_id:
                          return True
              return False
  
          def calculate_bac(weight, gender, drinks, hours):
              r = 0.68 if gender == 'male' else 0.55
              bac = (drinks * 14) / (weight * r) - (0.015 * hours)
              return bac
  
          def record_swipe_data(user_id, license_number, bac):
              with open('swipe_data.csv', mode='a') as file:
                  writer = csv.writer(file)
                  writer.writerow([user_id, license_number, bac, time.strftime("%Y-%m-%d %H:%M:%S")])
  
          password = input("Enter password: ")
          if password != PASSWORD:
              print("Incorrect password")
              return False
  
          mode = input("Select mode (1: Normal, 2: Party, 3: Special): ")
          if mode not in OPERATING_MODES:
              print("Invalid mode")
              return False
  
          user_id = input("Enter user ID: ")
          if not check_user_registration(user_id):
              print("User not registered")
              return False
  
          license_number = input("Enter license number: ")
          if not check_license_validity(license_number):
              print("Invalid license")
              return False
  
          weight = float(input("Enter weight (kg): "))
          gender = input("Enter gender (male/female): ")
          drinks = int(input("Enter number of drinks: "))
          hours = float(input("Enter hours since first drink: "))
  
          bac = calculate_bac(weight, gender, drinks, hours)
          if bac >= BAC_THRESHOLD:
              print("BAC too high")
              return False
  
          record_swipe_data(user_id, license_number, bac)
  
          GPIO.output(18, GPIO.HIGH)
          time.sleep(2)
          GPIO.output(18, GPIO.LOW)
  
          return True
  
      except Exception as e:
          print("error")
          return False
  