158 lines
No EOL
6.1 KiB
Python
158 lines
No EOL
6.1 KiB
Python
"""
|
|
Utilities for turning plain files into LBRY Files.
|
|
"""
|
|
|
|
import binascii
|
|
import logging
|
|
import os
|
|
from lbrynet.core.StreamDescriptor import PlainStreamDescriptorWriter
|
|
from lbrynet.cryptstream.CryptStreamCreator import CryptStreamCreator
|
|
from lbrynet import conf
|
|
from lbrynet.lbryfile.StreamDescriptor import get_sd_info
|
|
from lbrynet.core.cryptoutils import get_lbry_hash_obj
|
|
from twisted.protocols.basic import FileSender
|
|
from lbrynet.lbryfilemanager.LBRYFileDownloader import ManagedLBRYFileDownloader
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class LBRYFileStreamCreator(CryptStreamCreator):
|
|
"""
|
|
A CryptStreamCreator which adds itself and its additional metadata to an LBRYFileManager
|
|
"""
|
|
def __init__(self, blob_manager, lbry_file_manager, name=None,
|
|
key=None, iv_generator=None, suggested_file_name=None):
|
|
CryptStreamCreator.__init__(self, blob_manager, name, key, iv_generator)
|
|
self.lbry_file_manager = lbry_file_manager
|
|
if suggested_file_name is None:
|
|
self.suggested_file_name = name
|
|
else:
|
|
self.suggested_file_name = suggested_file_name
|
|
self.stream_hash = None
|
|
self.blob_infos = []
|
|
|
|
def _blob_finished(self, blob_info):
|
|
log.debug("length: %s", str(blob_info.length))
|
|
self.blob_infos.append(blob_info)
|
|
|
|
def _save_stream_info(self):
|
|
stream_info_manager = self.lbry_file_manager.stream_info_manager
|
|
d = stream_info_manager.save_stream(self.stream_hash, binascii.hexlify(self.name),
|
|
binascii.hexlify(self.key),
|
|
binascii.hexlify(self.suggested_file_name),
|
|
self.blob_infos)
|
|
return d
|
|
|
|
def setup(self):
|
|
d = CryptStreamCreator.setup(self)
|
|
return d
|
|
|
|
def _get_blobs_hashsum(self):
|
|
blobs_hashsum = get_lbry_hash_obj()
|
|
for blob_info in sorted(self.blob_infos, key=lambda b_i: b_i.blob_num):
|
|
length = blob_info.length
|
|
if length != 0:
|
|
blob_hash = blob_info.blob_hash
|
|
else:
|
|
blob_hash = None
|
|
blob_num = blob_info.blob_num
|
|
iv = blob_info.iv
|
|
blob_hashsum = get_lbry_hash_obj()
|
|
if length != 0:
|
|
blob_hashsum.update(blob_hash)
|
|
blob_hashsum.update(str(blob_num))
|
|
blob_hashsum.update(iv)
|
|
blob_hashsum.update(str(length))
|
|
blobs_hashsum.update(blob_hashsum.digest())
|
|
return blobs_hashsum.digest()
|
|
|
|
def _make_stream_hash(self):
|
|
hashsum = get_lbry_hash_obj()
|
|
hashsum.update(binascii.hexlify(self.name))
|
|
hashsum.update(binascii.hexlify(self.key))
|
|
hashsum.update(binascii.hexlify(self.suggested_file_name))
|
|
hashsum.update(self._get_blobs_hashsum())
|
|
self.stream_hash = hashsum.hexdigest()
|
|
|
|
def _finished(self):
|
|
self._make_stream_hash()
|
|
d = self._save_stream_info()
|
|
return d
|
|
|
|
|
|
def create_lbry_file(session, lbry_file_manager, file_name, file_handle, key=None,
|
|
iv_generator=None, suggested_file_name=None):
|
|
"""
|
|
Turn a plain file into an LBRY File.
|
|
|
|
An LBRY File is a collection of encrypted blobs of data and the metadata that binds them
|
|
together which, when decrypted and put back together according to the metadata, results
|
|
in the original file.
|
|
|
|
The stream parameters that aren't specified are generated, the file is read and broken
|
|
into chunks and encrypted, and then a stream descriptor file with the stream parameters
|
|
and other metadata is written to disk.
|
|
|
|
@param session: An LBRYSession object.
|
|
@type session: LBRYSession
|
|
|
|
@param lbry_file_manager: The LBRYFileManager object this LBRY File will be added to.
|
|
@type lbry_file_manager: LBRYFileManager
|
|
|
|
@param file_name: The path to the plain file.
|
|
@type file_name: string
|
|
|
|
@param file_handle: The file-like object to read
|
|
@type file_handle: any file-like object which can be read by twisted.protocols.basic.FileSender
|
|
|
|
@param secret_pass_phrase: A string that will be used to generate the public key. If None, a
|
|
random string will be used.
|
|
@type secret_pass_phrase: string
|
|
|
|
@param key: the raw AES key which will be used to encrypt the blobs. If None, a random key will
|
|
be generated.
|
|
@type key: string
|
|
|
|
@param iv_generator: a generator which yields initialization vectors for the blobs. Will be called
|
|
once for each blob.
|
|
@type iv_generator: a generator function which yields strings
|
|
|
|
@param suggested_file_name: what the file should be called when the LBRY File is saved to disk.
|
|
@type suggested_file_name: string
|
|
|
|
@return: a Deferred which fires with the stream_hash of the LBRY File
|
|
@rtype: Deferred which fires with hex-encoded string
|
|
"""
|
|
|
|
def stop_file(creator):
|
|
log.debug("the file sender has triggered its deferred. stopping the stream writer")
|
|
return creator.stop()
|
|
|
|
def make_stream_desc_file(stream_hash):
|
|
log.debug("creating the stream descriptor file")
|
|
descriptor_file_path = os.path.join(session.db_dir, file_name + conf.CRYPTSD_FILE_EXTENSION)
|
|
descriptor_writer = PlainStreamDescriptorWriter(descriptor_file_path)
|
|
|
|
d = get_sd_info(lbry_file_manager.stream_info_manager, stream_hash, True)
|
|
|
|
d.addCallback(descriptor_writer.create_descriptor)
|
|
|
|
return d
|
|
|
|
base_file_name = os.path.basename(file_name)
|
|
|
|
lbry_file_creator = LBRYFileStreamCreator(session.blob_manager, lbry_file_manager, base_file_name,
|
|
key, iv_generator, suggested_file_name)
|
|
|
|
def start_stream():
|
|
file_sender = FileSender()
|
|
d = file_sender.beginFileTransfer(file_handle, lbry_file_creator)
|
|
d.addCallback(lambda _: stop_file(lbry_file_creator))
|
|
d.addCallback(lambda _: make_stream_desc_file(lbry_file_creator.stream_hash))
|
|
d.addCallback(lambda _: lbry_file_creator.stream_hash)
|
|
return d
|
|
|
|
d = lbry_file_creator.setup()
|
|
d.addCallback(lambda _: start_stream())
|
|
return d |