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Issue migrated (2015-06-05) from old issue tracker http://mirrorbrain.org/issues/issue38

Title    add magnet links to Metalinks
 Priority   wish    Status   in-progress
Superseder        Nosy List  ant, poeml
Assigned To poeml  Keywords

                           Files

File name Uploaded Type Edit Remove
dax33.html funnycafeteria6, 2013-10-18.20:49:40 html

msg130 (view) Author: poeml Date: 2010-02-16.17:29:36

The planned redesign of the hash cache will (should) also allow to trivially add
magnet links into metalinks.

See http://en.wikipedia.org/wiki/Magnet_URI_scheme

msg147 (view) Author: poeml Date: 2010-03-10.00:16:17

For now, this is blocked by issue 40.

msg152 (view) Author: poeml Date: 2010-03-12.00:02:46

Issue #40 is resolved far enough so to not block this change anymore.

msg153 (view) Author: poeml Date: 2010-03-12.00:33:54

For Magnet links, we need to base32-encode stuff in Apache.

h = hashlib.sha1()
h.update('asdf')
base64.b32encode(h.digest())
'HWSUCVMZDCUARQSAFO5FAEXWYYFSOZQ4'

msg154 (view) Author: poeml Date: 2010-03-12.00:52:44

Ah, I'm relieved:

http://wiki.bitcomet.com/Peers,_seeds,_torrent,_tracker,_DHT,_Peer_Exchange_(PEX),_Magnet_Links
The first implementations for Magnet Links required that the
BitTorrent hash values contained in Magnet Links be Base32
encoded.^[7] Later that was changed to hex encoding, which is the
format recommended at this point for magnet links by the official
BitTorrent specifications.^[8]
[8] http://www.bittorrent.org/beps/bep_0009.html#magnet-uri-format

msg155 (view) Author: poeml Date: 2010-03-12.02:00:39

Basic magnet links implemented in new metalinks now. (r7988)

I think the magnet links should be shown in the mirror list as well.

Also there should be a handler that replies with the magnet link (or
redirects to one??) when .magnet is appended to an URL. Is that
possible?

msg156 (view) Author: poeml Date: 2010-03-12.02:01:53

Example:

% curl -s "http://192.168.0.115/extended/3.1.1rc2/OOo_3.1.1rc2_20090820_Win32Intel_langpack_sw-TZ.exe?meta4" | grep magnet
magnet:&xl=24822941&dn=OOo_3.1.1rc2_20090820_Win32Intel_langpack_sw-TZ.exe?xt=urn:sha1:0e1aefc1df0ba4c147fb36d3c62d000441e6b945?xt=urn:bith:0e1aefc1df0ba4c147fb36d3c62d000441e6b945&xt=urn:md5:c7feb5365c2e9ce205ba212c6fa19aa0

msg157 (view) Author: poeml Date: 2010-03-12.02:47:41

mediatype changed to "torrent". See metalink-discussion list for further
discussion.

msg176 (view) Author: poeml Date: 2010-03-31.20:30:46

The hashes that our current magnet links contain are not optimal.

(Info by Harold Feit following below.)

• BTIH + MD5 magnets don't work that well
• although we CAN get away with it on single-file torrents
• it would never work right on batches
• and clients that support magnets, but not torrent magnets don't use MD5 as their
  search key
• they usually use SHA1
• which, in a magnet, needs to be Base32 encoded

On the URL http://opensource.depthstrike.com/, several examples can be found.

msg180 (view) Author: poeml Date: 2010-04-23.02:53:24

Further note:

as= and xs= are compatible with the sha1 Magnets. But not btih ones.

Minimal example for an SHA1 Magnet:
xt=urn:sha1:<file's base32 encoded sha1 hash>&xl=<file's size>&dn=<file's
name>&as=

History
         Date              User       Action              Args
2013-10-18 20:49:40 funnycafeteria6 set    files: + dax33.html
2010-04-23 02:53:24 poeml           set    messages: + msg180
2010-03-31 20:30:46 poeml           set    messages: + msg176
2010-03-29 06:45:04 ant             set    nosy: + ant
2010-03-12 02:47:41 poeml           set    messages: + msg157
2010-03-12 02:01:53 poeml           set    messages: + msg156
2010-03-12 02:00:40 poeml           set    status: deferred -> in-progress
                                             messages: + msg155
2010-03-12 00:52:44 poeml           set    messages: + msg154
2010-03-12 00:33:54 poeml           set    messages: + msg153
2010-03-12 00:02:46 poeml           set    messages: + msg152
2010-03-10 00:18:06 poeml           set    assignedto: poeml
2010-03-10 00:16:17 poeml           set    status: chatting -> deferred
                                             messages: + msg147
2010-02-16 17:29:37 poeml           create

(end of migrated issue)