#!/usr/bin/env python
#-*- coding: utf-8 -*-

# Stéganô - Stéganô is a basic Python Steganography module.
# Copyright (C) 2010-2016  Cédric Bonhomme - https://www.cedricbonhomme.org
#
# For more information : https://github.com/cedricbonhomme/Stegano
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>

__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 0.5 $"
__date__ = "$Date: 2016/03/18 $"
__license__ = "GPLv3"

try:
    from stegano import lsb
except:
    print("Install Stegano: sudo pip install Stegano")

from stegano import tools

from optparse import OptionParser
parser = OptionParser(version=__version__)
parser.add_option('--hide', action='store_true', default=False,
                help="Hides a message in an image.")
parser.add_option('--reveal', action='store_true', default=False,
                help="Reveals the message hided in an image.")
# Original image
parser.add_option("-i", "--input", dest="input_image_file",
                help="Input image file.")
# Image containing the secret
parser.add_option("-o", "--output", dest="output_image_file",
                help="Output image containing the secret.")

# Non binary secret message to hide
parser.add_option("-m", "--secret-message", dest="secret_message",
                help="Your secret message to hide (non binary).")

# Binary secret to hide (OGG, executable, etc.)
parser.add_option("-f", "--secret-file", dest="secret_file",
                help="Your secret to hide (Text or any binary file).")
# Output for the binary binary secret.
parser.add_option("-b", "--binary", dest="secret_binary",
                help="Output for the binary secret (Text or any binary file).")

parser.set_defaults(input_image_file = './pictures/Lenna.png',
                    output_image_file = './pictures/Lenna_enc.png',
                    secret_message = '', secret_file = '', secret_binary = "")

(options, args) = parser.parse_args()


if options.hide:
    if options.secret_message != "" and options.secret_file == "":
        secret = options.secret_message
    elif options.secret_message == "" and options.secret_file != "":
        secret = tools.binary2base64(options.secret_file)

    img_encoded = lsb.hide(options.input_image_file, secret)
    try:
        img_encoded.save(options.output_image_file)
    except Exception as e:
        # If hide() returns an error (Too long message).
        print(e)

elif options.reveal:
    secret = lsb.reveal(options.input_image_file)
    if options.secret_binary != "":
        data = tools.base642binary(secret)
        with open(options.secret_binary, "w") as f:
            f.write(data)
    else:
        print(secret)