-
Notifications
You must be signed in to change notification settings - Fork 0
/
torrent.py
154 lines (125 loc) · 5.04 KB
/
torrent.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
"""
pears: A simple BitTorrent client
MIT License
Copyright (c) 2020 Chaitanya Deshpande
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""
import argparse
import asyncio
from collections import namedtuple
from hashlib import sha1
import bencodepy
from logger import init_logger, debug_logging_enabled
from tracker import Tracker
logging = init_logger(__name__, testing_mode=debug_logging_enabled)
"""
Represents each file within the torrent
"""
TorrentFile = namedtuple('TorrentFile', ['name', 'length'])
class Torrent:
"""
Represents torrent meta-data present in the .torrent file
More info: https://wiki.theory.org/BitTorrentSpecification#Metainfo_File_Structure
"""
def __init__(self, torrent_path):
self.torrent_path = torrent_path
self.files = []
if self._validate_torrent_file():
self.meta_info = bencodepy.bread(self.torrent_path)
info = bencodepy.encode(self.meta_info[b"info"])
self.info_hash = sha1(info).digest()
self._get_torrent_files()
def __str__(self):
return f'Filename: {self.files[0].name}\n' \
f'File length: {self.total_length}\n' \
f'Announce URL: {self.announce}\n' \
f'Hash: {self.info_hash}'
def _validate_torrent_file(self) -> bool:
"""
Validates the input file to check if it is a valid torrent file
"""
import os
try:
if not os.path.isfile(self.torrent_path):
raise RuntimeError(f"Exception: \"{self.torrent_path}\" is not a file")
elif not self.torrent_path.endswith(".torrent"):
raise RuntimeError(f"Exception: \"{self.torrent_path}\" is not a valid torrent file")
except RuntimeError as e:
print(e)
return False
return True
def _get_torrent_files(self):
"""
Returns the file present in the torrent. Currently it doesn't support torrents containing multiple files
"""
if self.is_multi_file:
raise RuntimeError("Torrent contains multiple files. This is not supported currently.")
self.files.append(
TorrentFile(
name=self.meta_info[b"info"][b"name"].decode("utf-8"),
length=self.meta_info[b"info"][b"length"]))
@property
def announce(self) -> str:
"""
Returns the tracker URL
"""
return self.meta_info[b"announce"].decode("utf-8")
@property
def is_multi_file(self) -> bool:
"""
Returns if the torrent consists of multiple files
"""
return b"files" in self.meta_info[b"info"]
@property
def piece_length(self) -> int:
"""
Returns length of each piece in bytes
"""
return self.meta_info[b"info"][b"piece length"]
@property
def total_length(self) -> int:
"""
Returns the total size of files in bytes
"""
if self.is_multi_file:
raise RuntimeError("Torrent contains multiple files. This is not supported currently.")
return self.files[0].length
@property
def pieces(self):
"""
Returns a list containing the SHA1 (each 20 bytes long) of all the pieces
"""
data = self.meta_info[b"info"][b"pieces"]
pieces, offset, length = [], 0, len(data)
pieces = [data[offset: offset + 20] for offset in range(0, length, 20)]
return pieces
@property
def output_file(self):
"""
Returns the output filename that we will use to save the torrent data in
"""
logging.info("Torrent output file: {0}".format(self.meta_info[b"info"][b"name"].decode("utf-8")))
return self.meta_info[b"info"][b"name"].decode("utf-8")
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("-f", "--file", help="Torrent's absolute file path", type=str, required=True)
args = parser.parse_args()
t = Torrent(torrent_path=args.file)
tr = Tracker(t)
loop = asyncio.get_event_loop()
r1 = loop.run_until_complete(tr.connect())
print(r1)