from __future__ import print_function
import argparse
import os
import pytsk3
import pyewf
import sys
from tabulate import tabulate

"""
MIT License

Copyright (c) 2017 Chapin Bryce, Preston Miller

Please share comments and questions at:
    https://github.com/PythonForensics/PythonForensicsCookbook
    or email pyforcookbook@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

__authors__ = ["Chapin Bryce", "Preston Miller"]
__date__ = 20170815
__description__ = "Utility to gather open evidence containers"


class EWFImgInfo(pytsk3.Img_Info):
    def __init__(self, ewf_handle):
        self._ewf_handle = ewf_handle
        super(EWFImgInfo, self).__init__(url="",
                                         type=pytsk3.TSK_IMG_TYPE_EXTERNAL)

    def close(self):
        self._ewf_handle.close()

    def read(self, offset, size):
        self._ewf_handle.seek(offset)
        return self._ewf_handle.read(size)

    def get_size(self):
        return self._ewf_handle.get_media_size()


def main(image, img_type, offset):
    print("[+] Opening {}".format(image))
    if img_type == "ewf":
        try:
            filenames = pyewf.glob(image)
        except IOError:
            _, e, _ = sys.exc_info()
            print("[-] Invalid EWF format:\n {}".format(e))
            sys.exit(2)
        ewf_handle = pyewf.handle()
        ewf_handle.open(filenames)
        # Open PYTSK3 handle on EWF Image
        img_info = EWFImgInfo(ewf_handle)
    else:
        img_info = pytsk3.Img_Info(image)

    # Get Filesystem Handle
    try:
        fs = pytsk3.FS_Info(img_info, offset)
    except IOError:
        _, e, _ = sys.exc_info()
        print("[-] Unable to open FS:\n {}".format(e))
        exit()

    root_dir = fs.open_dir(path="/")
    table = [["Name", "Type", "Size", "Create Date", "Modify Date"]]
    for f in root_dir:
        name = f.info.name.name
        if f.info.meta.type == pytsk3.TSK_FS_META_TYPE_DIR:
            f_type = "DIR"
        else:
            f_type = "FILE"
        size = f.info.meta.size
        create = f.info.meta.crtime
        modify = f.info.meta.mtime
        table.append([name, f_type, size, create, modify])
    print(tabulate(table, headers="firstrow"))


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__description__,
        epilog="Developed by {} on {}".format(
            ", ".join(__authors__), __date__)
    )
    parser.add_argument("EVIDENCE_FILE", help="Evidence file path")
    parser.add_argument("TYPE",
                        help="Type of evidence: raw (dd) or EWF (E01)",
                        choices=("raw", "ewf"))
    parser.add_argument("-o", "--offset",
                        help="Partition byte offset", type=int)
    args = parser.parse_args()

    if os.path.exists(args.EVIDENCE_FILE) and \
            os.path.isfile(args.EVIDENCE_FILE):
        main(args.EVIDENCE_FILE, args.TYPE, args.offset)
    else:
        print("[-] Supplied input file {} does not exist or is not a "
              "file".format(args.EVIDENCE_FILE))
        sys.exit(1)