BT種子文件相對磁力鏈來說存儲不方便,而且在網站上存放BT文件容易引起版權糾紛,而磁力鏈相對來說則風險小一些。而且很多論壇或者網站限制了文件上傳的類型,分享一個BT種子還需要改文件后綴或者壓縮一次,其他人需要下載時候還要額外多一步下載種子的操作。
所以將BT種子轉換為占用空間更小,分享更方便的磁力鏈還是有挺大好處的。
首先一個方案是使用bencode這個插件,通過pip方式安裝或者自行下載源文件https://pypi.python.org/pypi/bencode/1.0通過python setup.py install方式安裝均可。
相應的將BT種子轉換為磁力鏈代碼為:
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import bencode, hashlib, base64, urllib torrent = open ( 'ubuntu-12.04.2-server-amd64.iso.torrent' , 'rb' ).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' ], 'tr' : metadata[ 'announce' ], 'xl' : metadata[ 'info' ][ 'length' ]} paramstr = urllib.urlencode(params) magneturi = 'magnet:?%s' % paramstr print magneturi |
還有另外一個效率相對較高,而且更方便的方案是安裝libtorrent,在ubuntu只需要apt-get install python-libtorrent即可對應轉換磁力鏈的代碼為:
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import libtorrent as bt info = bt.torrent_info( 'test.torrent' ) print "magnet:?xt=urn:btih:%s&dn=%s" % (info.info_hash(), info.name()) |
轉換磁力鏈接為bt種子文件
下面來看一個反過程,將磁力鏈轉化為種子文件。
1、需要先安裝python-libtorrent包 ,在ubuntu環境下,可以通過以下指令完成安裝:
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# sudo apt-get install python-libtorrent |
2、代碼如下:
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#!/usr/bin/env python import shutil import tempfile import os.path as pt import sys import libtorrent as lt from time import sleep def magnet2torrent(magnet, output_name = None ): if output_name and \ not pt.isdir(output_name) and \ not pt.isdir(pt.dirname(pt.abspath(output_name))): print ( "Invalid output folder: " + pt.dirname(pt.abspath(output_name))) print ("") sys.exit( 0 ) tempdir = tempfile.mkdtemp() ses = lt.session() params = { 'save_path' : tempdir, 'duplicate_is_error' : True , 'storage_mode' : lt.storage_mode_t( 2 ), 'paused' : False , 'auto_managed' : True , 'duplicate_is_error' : True } handle = lt.add_magnet_uri(ses, magnet, params) print ( "Downloading Metadata (this may take a while)" ) while ( not handle.has_metadata()): try : sleep( 1 ) except KeyboardInterrupt: print ( "Aborting..." ) ses.pause() print ( "Cleanup dir " + tempdir) shutil.rmtree(tempdir) sys.exit( 0 ) ses.pause() print ( "Done" ) torinfo = handle.get_torrent_info() torfile = lt.create_torrent(torinfo) output = pt.abspath(torinfo.name() + ".torrent" ) if output_name: if pt.isdir(output_name): output = pt.abspath(pt.join( output_name, torinfo.name() + ".torrent" )) elif pt.isdir(pt.dirname(pt.abspath(output_name))): output = pt.abspath(output_name) print ( "Saving torrent file here : " + output + " ..." ) torcontent = lt.bencode(torfile.generate()) f = open (output, "wb" ) f.write(lt.bencode(torfile.generate())) f.close() print ( "Saved! Cleaning up dir: " + tempdir) ses.remove_torrent(handle) shutil.rmtree(tempdir) return output def showHelp(): print ("") print ( "USAGE: " + pt.basename(sys.argv[ 0 ]) + " MAGNET [OUTPUT]" ) print ( " MAGNET\t- the magnet url" ) print ( " OUTPUT\t- the output torrent file name" ) print ("") def main(): if len (sys.argv) < 2 : showHelp() sys.exit( 0 ) magnet = sys.argv[ 1 ] output_name = None if len (sys.argv) > = 3 : output_name = sys.argv[ 2 ] magnet2torrent(magnet, output_name) if __name__ = = "__main__" : main() |
3、用法如下
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# python Magnet_To_Torrent2.py <magnet link> [torrent file] |