JSON Loader And Validator

jlav.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# created by Lord Shedy
# version: 1.0.1
import json
from jsonschema import validate

from datetime import datetime

"""
a function to load and validate JSON file (if it is JSON valid)

expects readable datapath of a JSON file, as a string
returns string of the content of the JSON file, if JSON valid, else error message, as a string

the validation is based on whether or not the json.loads() function throws exception or not
it is not meant as a fully fledged JSON syntax validator!
"""
def loadJSONfile(dataFilePath: str) -> str:
      try:
          f = open(dataFilePath, "r")
      except:
          raise Exception("There was some error when loading" + dataFilePath + "!")
      else:
        try:
          dataFileContent = json.loads(f.read())
        except:
          raise Exception(dataFilePath + " is not a valid JSON file!")
        else:
          return dataFileContent

"""
a function to validate JSON file according to the jsonschema library

expects valid JSON file path or JSON file content as a string
returns whether or not the data file is valid to the schema, as a boolean

the schema must be compliant to the schema syntaxt of jsonschema library!
"""
def validateJSONfile(dataFilePath: str, schemaFilePath: str) -> bool:
  try:
    dataFileContent = loadJSONfile(dataFilePath)
    schemaFileContent = loadJSONfile(schemaFilePath)
  except:
    try:
      validate(instance = dataFilePath, schema = schemaFilePath)
    except:
      return 0
    else:
      return 1
  else:
    try:
      validate(instance = dataFileContent, schema = schemaFileContent)
    except:
      return 0
    else:
      return 1

"""
a function to load and validate JSON file, it uses two functions above

expects valid JSON file as a string and a JSON schema file as a string
returns the JSON file content if valid, error message if not valid, as a string
"""
def loadAndValidateJSONfile(dataFilePath: str, schemaFilePath: str) -> str:
  dataFile = loadJSONfile(dataFilePath)
  if validateJSONfile(dataFilePath, schemaFilePath):
    return dataFile