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import io
import os
from whoosh.filedb.filestore import FileStorage
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
self.length_cache = {}
FileStorage.__init__(self, path, supports_mmap=False)
def open_file(self, name, **kwargs):
return self._open_encrypted_file(name, onclose=self._encrypt_index_on_close(name))
def create_file(self, name, excl=False, mode="w+b", **kwargs):
f = StructFile(io.BytesIO(), name=name, onclose=self._encrypt_index_on_close(name))
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)
return EncryptedFileStorage(path, self.masterkey).create()
def file_length(self, name):
return self.length_cache[name]
def _encrypt_index_on_close(self, name):
def wrapper(struct_file):
struct_file.seek(0)
content = struct_file.file.read()
self.length_cache[name] = len(content)
encrypted_content = self.f.encrypt(content)
with open(self._fpath(name), 'w+b') as f:
f.write(encrypted_content)
return wrapper
def _open_encrypted_file(self, name, onclose=lambda x: None):
file_content = open(self._fpath(name), "rb").read()
decrypted = self.f.decrypt(file_content)
return BufferFile(buffer(decrypted), name=name, onclose=onclose)
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