Motivation
It's easier to send just a link instead of a file if you want to share a torrent file.Create the magic link
To create the magic link I used the bencode library (python). To easily install it we need first easy_install. The first thing to to is to install easy_install
wget http://pypi.python.org/packages/2.7/s/setuptools/setuptools-0.6c11-py2.7.egg#md5=fe1f997bc722265116870bc7919059ea
sudo chmod 755 setuptools-0.6c11-py2.7.egg
sudo ./setuptools-0.6c11-py2.7.egg
Now it's very simple to install bencode
easy_install http://pypi.python.org/packages/2.7/b/bencode/bencode-1.0-py2.7.egg#md5=fa08025585d4cd7700bed503b6baf018
That's your preconditions. Now we can write our python script which will generate the magnic link.
nano createMagnetLink.py
Put following content into it
!/usr/bin/python
import sys
import urllib
import bencode
import hashlib
import base64
if len(sys.argv) == 0:
print("Usage: file")
exit()
torrent = open(sys.argv[1], 'r').read()
metadata = bencode.bdecode(torrent)
hashcontents = bencode.bencode(metadata['info'])
digest = hashlib.sha1(hashcontents).digest()
b32hash = base64.b32encode(digest)
params = {'xt': 'urn:btih:%s' % b32hash,
'dn': metadata['info']['name']}
announcestr = ''
for announce in metadata['announce-list']:
announcestr += '&' + urllib.urlencode({'tr':announce[0]})
paramstr = urllib.urlencode(params) + announcestr
magneturi = 'magnet:?%s' % paramstr
print(magneturi)
Make the file executable
sudo nano 755 createMagnetLink.py
And the just call it with a torrent file
./createMagnetLink.py file.torrent
