secure_cli_tool.py

#!/usr/bin/env python3
import argparse
import os
import secrets
import hashlib
import json

# Main class for Secure CLI Tool
class SecureCLITool:
    def __init__(self):
        self.parser = argparse.ArgumentParser(description='Secure CLI Tool for Blockchain Applications')
        self.setup_arguments()

    def setup_arguments(self):
        # Define command line arguments
        self.parser.add_argument('command', choices=['generate-key', 'verify-transaction'], help='command to execute')
        self.parser.add_argument('--txid', type=str, help='Transaction ID to verify')
        self.parser.add_argument('--key-length', type=int, default=32, help='Key length in bytes for generate-key command (default: 32)')

    def generate_key(self, key_length):
        # Generate a secure random key with configurable length
        if key_length < 16:
            print('Warning: Key length less than 16 bytes may not provide sufficient security')
        key = secrets.token_hex(key_length)  # Configurable secure random key
        print(f'Generated secure key ({key_length} bytes): {key}')

    def verify_transaction(self, txid):
        # Placeholder: In reality, you'd check the transaction integrity from a blockchain
        if not txid:
            print('Error: Transaction ID is required for verification.')
            return
        if len(txid) != 64:
            print('Error: Invalid Transaction ID length. It should be 64 characters.')
            return
        if not all(c in '0123456789abcdef' for c in txid):
            print('Error: Invalid Transaction ID format. It should be a hexadecimal string.')
            return
        print(f'Verifying transaction with ID: {txid}')
        # Simulate verification process
        verified = hashlib.sha256(txid.encode()).hexdigest()  # Simulate hash for demonstration
        print(f'Transaction {txid} verification result: {verified}')

    def run(self):
        # Parse command line arguments
        args = self.parser.parse_args()
        if args.command == 'generate-key':
            self.generate_key(args.key_length)
        elif args.command == 'verify-transaction':
            self.verify_transaction(args.txid)

if __name__ == '__main__':
    tool = SecureCLITool()
    tool.run()