validator.py

import json
import sys
import os

def is_sorted_alphabetically(array):
    """
    Check if the elements of array are sorted alphabetically.
    :param array: An array containing strings.
    :return: (True, -1, -1) if the elements are sorted alphabetically. If not, (False, i, j) where i and j are the
    indices of the elements that are in wrong order.
    """
    for i, string in enumerate(array[1:]):
        if string < array[i]:
            return (False, i, i+1)
    return (True, -1, -1)

path = sys.argv[1]
if not os.path.exists(path):
    sys.exit("File " + path +  " does not exist!")

# Test parsing json file
try:
    with open(path, 'r') as json_file:
        json_data = json.load(json_file)
except ValueError:
    sys.exit("Invalid JSON!")

# Test version number
try:
    version_number = json_data['version']
except KeyError:
    sys.exit('Field "version" is missing!')

if not isinstance(version_number, int):
    sys.exit('Field "version" does not contain an integer!')

# Test ssids array
try:
    ssids = json_data['ssids']
except KeyError:
    sys.exit('Field "ssids" is missing!')

if not isinstance(ssids, list):
    sys.exit('Field "ssids" does not contain an array!')

for ssid in ssids:
    if not isinstance(ssid, str):
        sys.exit('SSID {} is not a string!'.format(ssid))


# Test deprecated array
try:
    deprecated_ssids = json_data['deprecated']
except KeyError:
    sys.exit('Field "deprecated" is missing!')

if not isinstance(deprecated_ssids, list):
    sys.exit('Field "deprecated" does not contain an array!')

for ssid in deprecated_ssids:
    if not isinstance(ssid, str):
        sys.exit('Deprecated SSID {} is not a string!'.format(ssid))

print('JOSN formatting is valid')

# Test if SSIDs are sorted aphabetically
res = is_sorted_alphabetically(ssids)
if not res[0]:
    sys.exit('SSIDs are not sorted alphabetically, see "{}" and "{}"'.format(ssids[res[1]], ssids[res[2]]))

res = is_sorted_alphabetically(deprecated_ssids)
if not res[0]:
    sys.exit('Deprecated SSIDs are not sorted alphabetically, see "{}" and "{}"'.format(deprecated_ssids[res[1]], deprecated_ssids[res[2]]))
    
print('{} SSIDs found.'.format(len(ssids)))
print('{} deprecated SSIDs found.'.format(len(deprecated_ssids)))
print('Validation complete!')