#!/usr/bin/env python3
"""
Implementation

Source: Chapter_18_Evasion_Obfuscation_and_Adversarial_Inputs
Category: evasion
"""

import base64
from urllib.parse import quote, quote_plus

import argparse
import sys

class EncodingObfuscator:
    """Use various encodings to bypass text filters"""

    def base64_encode(self, text):
        """Encode text in base64"""
        encoded = base64.b64encode(text.encode()).decode()
        return encoded, f"echo '{encoded}' | base64 -d"

    def base64_url_safe(self, text):
        """Base64 URL-safe encoding"""
        encoded = base64.urlsafe_b64encode(text.encode()).decode()
        return encoded

    def hex_encode(self, text):
        """Encode as hexadecimal"""
        hex_str = text.encode().hex()
        return hex_str, f"echo '{hex_str}' | xxd -r -p"

    def url_encode(self, text):
        """URL encoding"""
        return quote(text), quote_plus(text)

    def multiple_layers(self, text, layers=3):
        """Apply multiple encoding layers"""
        result = text
        encodings = []

        for i in range(layers):
            result = base64.b64encode(result.encode()).decode()
            encodings.append(f"Layer {i+1}: {result[:50]}...")

        return result, encodings

    def mixed_encoding(self, text):
        """Mix different encodings"""
        # Base64 first half, hex second half
        mid = len(text) // 2
        first_half = base64.b64encode(text[:mid].encode()).decode()
        second_half = text[mid:].encode().hex()

        return f"{first_half}|{second_half}"

# Example usage
enc = EncodingObfuscator()

payload = "rm -rf /"
print("=== Encoding Examples ===\n")

b64, b64_cmd = enc.base64_encode(payload)
print(f"Original:  {payload}")
print(f"Base64:    {b64}")
print(f"Decode:    {b64_cmd}\n")

hex_enc, hex_cmd = enc.hex_encode(payload)
print(f"Hex:       {hex_enc}")
print(f"Decode:    {hex_cmd}\n")

url_enc, url_plus = enc.url_encode(payload)
print(f"URL:       {url_enc}")
print(f"URL Plus:  {url_plus}\n")

multi, layers = enc.multiple_layers(payload, 3)
print(f"3x Base64: {multi}")
for layer in layers:
    print(f"  {layer}")


def main():
    """Command-line interface."""
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--verbose", "-v", action="store_true", help="Verbose output")
    args = parser.parse_args()
    
    # TODO: Add main execution logic
    pass

if __name__ == "__main__":
    main()