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msgfile.py
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msgfile.py
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# Copyright (c) 2016, Joseph deBlaquiere <jadeblaquiere@yahoo.com>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# * Neither the name of ciphrtxt nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import time
import mmap
import os
import shutil
import json
from ciphrtxt.message import MessageHeader, Message, _header_size_w_sig_v1, _header_size_w_sig_b64_v2
from ecpy.point import Point
class MessageFile(Message):
def __init__(self):
super(MessageFile, self).__init__()
self.filepath = None
self.size = None
self.time_str = None
self.expire_str = None
self.servertime = None
self.header = None
def ingest(self, filepath, I = None):
# validate header
with open(filepath, "rb") as f:
mm = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
ver = mm[:3]
if ver == b'M01':
header = mm[:_header_size_w_sig_v1]
else:
header = mm[:_header_size_w_sig_b64_v2]
mm.close()
if not self._deserialize_header(header):
return False
#hsplit = header.split(b':')
#if len(hsplit) != 8:
# return False
#self.sig = (int(hsplit[6], 16), int(hsplit[7], 16))
self.filepath = filepath
self.size = os.path.getsize(filepath)
self.header = header
self.time_str = time.asctime(time.gmtime(self.time))
self.expire_str = time.asctime(time.gmtime(self.expire))
self.servertime = int(os.path.getmtime(filepath))
return True
return False
def move_to(self, filepath):
if self.filepath is None:
raise ValueError("Attempt to move empty message")
shutil.move(self.filepath, filepath)
self.filepath = filepath
def delete(self):
if self.filepath is None:
raise ValueError("Attempt to delete empty message!")
try:
os.remove(self.filepath)
except OSError:
print('Error : file not found (continuing)')
self.filepath = None
self.time = None
self.expire = None
self.I = None
self.J = None
self.K = None
self.sig = None
self.header = None
self.size = None
self.time_str = None
self.expire_str = None
self.servertime = None
def metadata(self):
if self.filepath is None:
raise ValueError("Attempt to query empty message!")
result = {}
result["time"] = self.time
result["expire"] = self.expire
result["I"] = self.I.compress().decode()
result["J"] = self.J.compress().decode()
result["K"] = self.K.compress().decode()
result["signature"] = self.sig
result["size"] = self.size
result["time_str"] = self.time_str
result["expire_str"] = self.expire_str
result["servertime"] = self.servertime
result["version"] = self.version
return result
def dumpjson(self):
if self.filepath is None:
raise ValueError("Attempt to query empty message!")
result = {}
result["filepath"] = self.filepath
result["time"] = self.time
result["expire"] = self.expire
result["I"] = self.I.compress().decode()
result["J"] = self.J.compress().decode()
result["K"] = self.K.compress().decode()
result["size"] = self.size
result["time_str"] = self.time_str
result["expire_str"] = self.expire_str
result["servertime"] = self.servertime
result["signature"] = self.sig
result["header"] = self.header.decode()
result["version"] = self.version
return json.dumps(result)
@staticmethod
def loadjson(msgjson):
try:
mdict = json.loads(msgjson)
mnew = MessageFile()
mnew.filepath = mdict['filepath']
mnew.time = mdict['time']
mnew.expire = mdict['expire']
mnew.I = Point.decompress(mdict['I'])
mnew.J = Point.decompress(mdict['J'])
mnew.K = Point.decompress(mdict['K'])
mnew.size = mdict['size']
mnew.time_str = mdict['time_str']
mnew.expire_str = mdict['expire_str']
mnew.servertime = mdict['servertime']
mnew.sig = mdict['signature']
mnew.header = mdict['header']
mnew.version = mdict['version']
return mnew
except:
return None
def get_file(self):
return open(self.filepath, "rb")