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authorVictor Shyba <victor1984@riseup.net>2017-03-22 19:16:49 -0300
committerdrebs <drebs@leap.se>2017-04-04 18:27:38 +0200
commit4cf662b0b043579badd231f30fc4eb58f9e6f09c (patch)
tree78bd3b9490fa1a472b4891a088a68bcd6dcc23ef /client
parentaaa9115cfd4096a4fb6cf0ffbc2c07c75ed3a751 (diff)
[refactor] extracts tail logic into TruncatedTailPipe
Diffstat (limited to 'client')
-rw-r--r--client/src/leap/soledad/client/_blobs.py23
-rw-r--r--client/src/leap/soledad/client/_pipes.py51
2 files changed, 59 insertions, 15 deletions
diff --git a/client/src/leap/soledad/client/_blobs.py b/client/src/leap/soledad/client/_blobs.py
index 0d25702c..c64c2bb2 100644
--- a/client/src/leap/soledad/client/_blobs.py
+++ b/client/src/leap/soledad/client/_blobs.py
@@ -36,6 +36,7 @@ import treq
from leap.soledad.client.sqlcipher import SQLCipherOptions
from leap.soledad.client import pragmas
+from leap.soledad.client._pipes import TruncatedTailPipe
from leap.soledad.common.errors import SoledadError
from _crypto import DocInfo, BlobEncryptor, BlobDecryptor
@@ -106,7 +107,7 @@ class DecrypterBuffer(object):
def __init__(self, doc_id, rev, secret, tag):
self.decrypter = None
- self.buffer = BytesIO()
+ self.preamble = BytesIO()
self.doc_info = DocInfo(doc_id, rev)
self.secret = secret
self.tag = tag
@@ -116,30 +117,22 @@ class DecrypterBuffer(object):
if not self.decrypter:
return self.prepare_decrypter(data)
- self.buffer.write(data)
- if self.buffer.tell() > 16:
- overflow_size = self.buffer.tell() - 16
- self.buffer.seek(0)
- self.decrypter.write(self.buffer.read(overflow_size))
- remaining = self.buffer.read()
- self.buffer.seek(0)
- self.buffer.write(remaining)
- self.buffer.truncate()
+ self.output.write(data)
def prepare_decrypter(self, data):
if ' ' not in data:
- self.buffer.write(data)
+ self.preamble.write(data)
return
preamble_chunk, remaining = data.split(' ', 1)
- self.buffer.write(preamble_chunk)
+ self.preamble.write(preamble_chunk)
self.decrypter = BlobDecryptor(
- self.doc_info, BytesIO(self.buffer.getvalue()),
+ self.doc_info, BytesIO(self.preamble.getvalue()),
secret=self.secret,
armor=False,
start_stream=False,
tag=self.tag)
- self.buffer = BytesIO()
- self.write(remaining)
+ self.output = TruncatedTailPipe(self.decrypter, tail_size=16)
+ self.output.write(remaining)
def close(self):
return self.decrypter._end_stream(), self.decrypter.size
diff --git a/client/src/leap/soledad/client/_pipes.py b/client/src/leap/soledad/client/_pipes.py
new file mode 100644
index 00000000..ed89e14d
--- /dev/null
+++ b/client/src/leap/soledad/client/_pipes.py
@@ -0,0 +1,51 @@
+# -*- coding: utf-8 -*-
+# _pipes.py
+# Copyright (C) 2017 LEAP
+#
+# 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, see <http://www.gnu.org/licenses/>.
+"""
+Components for piping data on streams.
+"""
+from io import BytesIO
+
+
+__all__ = ['TruncatedTailPipe']
+
+
+class TruncatedTailPipe(object):
+ """
+ Truncate the last `tail_size` bytes from the stream.
+ """
+
+ def __init__(self, output=None, tail_size=16):
+ self.tail_size = tail_size
+ self.output = output or BytesIO()
+ self.buffer = BytesIO()
+
+ def write(self, data):
+ self.buffer.write(data)
+ if self.buffer.tell() > self.tail_size:
+ self._truncate_tail()
+
+ def _truncate_tail(self):
+ overflow_size = self.buffer.tell() - self.tail_size
+ self.buffer.seek(0)
+ self.output.write(self.buffer.read(overflow_size))
+ remaining = self.buffer.read()
+ self.buffer.seek(0)
+ self.buffer.write(remaining)
+ self.buffer.truncate()
+
+ def close(self):
+ return self.output