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from StringIO import StringIO
import io
import sys
import errno
import os
from whoosh.filedb.filestore import FileStorage, ReadOnlyError
from whoosh.filedb.structfile import StructFile, BufferFile
from cryptography.fernet import Fernet
from whoosh.util import random_name
class EncryptedFileStorage(FileStorage):
def __init__(self, path, masterkey=None):
self.masterkey = masterkey
self.f = Fernet(masterkey)
self._tmp_storage = self.temp_storage
FileStorage.__init__(self, path, supports_mmap=False)
def open_file(self, name, **kwargs):
def onclose(file_struct):
file_struct.seek(0)
content = file_struct.file.read()
encrypted_content = self.f.encrypt(content)
_file = open(self._fpath(name), 'w+b')
_file.write(encrypted_content)
return self._open_file(name, onclose=onclose)
def create_file(self, name, excl=False, mode="w+b", **kwargs):
def onclose(file_struct):
file_struct.seek(0)
content = file_struct.file.read()
encrypted_content = self.f.encrypt(content)
_file = open(self._fpath(name), 'w+b')
_file.write(encrypted_content)
f = StructFile(io.BytesIO(), name=name, onclose=onclose)
f.is_real = False
return f
def temp_storage(self, name=None):
name = name or "%s.tmp" % random_name()
path = os.path.join(self.folder, name)
tempstore = EncryptedFileStorage(path, self.masterkey)
# import pdb;pdb.set_trace()
return tempstore.create()
def file_length(self, name):
f = self._open_file(name)
length = len(f.file.read())
f.close()
return length
def _decrypt(self, file_content):
return self.f.decrypt(file_content) if len(file_content) else file_content
def _open_file(self, name, onclose=lambda x: None):
file_content = open(self._fpath(name), "rb").read()
decrypted = self._decrypt(file_content)
f = BufferFile(buffer(decrypted), name=name, onclose=onclose)
return f
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