#!/usr/bin/env python

import crochet
import glob
import pappyproxy

import zipfile
import tarfile

# This is a gross hack, please help
bz2 = None
try:
    import bz2
except:
    print "BZ2 not installed on your system"

from base64 import b64encode, b64decode
from os import getcwd, sep, path, urandom 
from pappyproxy.plugins.misc import CryptoCompressUtils as ccu

def compress_project():
    if bz2:
        tar_project()
    else:
        zip_project()

def decompress_project():
    if bz2:
        untar_project()
    else:
        unzip_project()

def zip_project():
    """
    Zip project files

    Using append mode (mode='a') will create a zip archive
    if none exists in the project.
    """
    try:
        zf = zipfile.ZipFile(ZIPFILE, mode="a")
        project_files = ccu.get_project_files() 
        for pf in project_files:
            zf.write(pf)
        zf.close()
    except e:
        raise PappyException("Error creating the zipfile", e)
    pass

def unzip_project():
    """
    Extract project files from decrypted zip archive.
    Initially checks the zip archive's magic number and
    attempts to extract pappy.json to validate integrity 
    of the zipfile.
    """
    if not zipfile.is_zipfile(ZIPFILE):
        raise PappyException("Project archive corrupted.")

    zf = zipfile.ZipFile(ZIPFILE)

    try:
        zf.extract("config.json")
    except e:
        raise PappyException("Project archive contents corrupted. Error: ", e)

    zf.extractall()

def tar_project():
    if tarfile.is_tarfile(BZ2FILE):
        archive = tarfile.open(ccu.BZ2FILE, 'w:bz2')
        project_files = ccu.get_project_files()

        # Read files line by line to accomodate larger files, e.g. the project database
        for pf in project_files:
            archive.add(pf)
	archive.close()

def untar_project():
    if tarfile.is_tarfile(BZ2FILE):
        # Attempt to read the first 16 bytes of the archive
        # Raise exception if there is a failure
	project_files = ccu.get_project_files()
        try:
            with tarfile.open(BZ2FILE, "r:bz2") as archive:
                for pf in project_files:
                    archive.add(pf)
        except e:
            raise PappyException("Project archive contents corrupted. Error: ", e