main.py

# Run using $ source .venv/Scripts/activate
import bcrypt 
import json

def exception_factory(exception, message):
     return exception(message)

class Register():

    def __init__(self, username="", password=""):
        self.username = username
        self.password = password
        pass

    def check_username_exists(self, filename="database.json"):
        if self.username not in filename:
            self.valid_username = True
            return 
        else:
            raise Exception("an error occurred")
        

    def hash_salt_password(self):
        password_bytes = self.password.encode('utf-8')
        self.password = bcrypt.hashpw(password_bytes, bcrypt.gensalt())
        self.password = self.password.decode()

    def create_user(self, filename="database.json"):
        user = {
                "username": self.username,
                "password": self.password,
            }
        with open(filename, 'r+') as file:
            # Load existing data into a dictionary
            file_data = json.load(file)
            
            # Append new data to the list
            file_data["user"].append(user)
            
            # Move the cursor to the beginning of the file
            file.seek(0)
            
            # Write the updated data back to the file
            json.dump(file_data, file, indent=4)
        pass


    # encrypt password
    # check whether username exists
    # validate password
    # write username to db file

class Login(Register):
    
    def __init__(self, username="", password="", username_match=False, password_verified=False):
        self.username = username
        self.password = password
        pass

    def check_password(self):
        hashed = bcrypt.hashpw(self.password, bcrypt.gensalt())

        if bcrypt.checkpw(self.password, hashed):
            self.password_verified = True
            return self.password_verified
        else:
            return self.password_verified

    def check_username(self):
        if self.check_username_exists(self):
            self.username_match = True
            return self.username_match
        else: 
            return self.username_match

    
     

    # encrypt username and password
    # check whether username exists
    # write username to db file 


# Function to append new data to JSON file
def write_json(new_data, filename='database.json'):
    with open(filename, 'r+') as file:
        # Load existing data into a dictionary
        file_data = json.load(file)
        
        # Append new data to the list
        file_data["user"].append(new_data)
        
        # Move the cursor to the beginning of the file
        file.seek(0)
        
        # Write the updated data back to the file
        json.dump(file_data, file, indent=4)

def read_json(filename='database.json'):
    with open(filename, 'r') as file:
        file_data = json.load(file)
        json.dumps(file_data, indent=4)
    pass

# New data to append
user = {
    "username": "Nikhil",
    "password": "pass",
}

def main():
    # Call the function to append data
    # write_json(user)
    username = input(f"Username:")
    password = input(f"Password:")
    new_user = Register(username, password)
    new_user.check_username_exists()
    new_user.hash_salt_password()
    new_user.create_user()
    
    pass

if __name__ == "__main__":
    main()