Fix parsed torrent

lib/torrent.js

@@ -196,7 +196,7 @@ class Torrent extends EventEmitter {
 
     let parsedTorrent
     try { parsedTorrent = parseTorrent(torrentId) } catch (err) {}
-    if (parsedTorrent) {
+    if (parsedTorrent && parsedTorrent.infoHash) {
       // Attempt to set infoHash property synchronously
       this.infoHash = parsedTorrent.infoHash
       this._debugId = parsedTorrent.infoHash.toString('hex').substring(0, 7)

test/client-add.js

@@ -205,3 +205,34 @@ test('client.add: invalid torrent id: short buffer', function (t) {
 
   client.add(Buffer.from('abc'))
 })
+
+test('client.add: non-bittorrent URNs', function (t) {
+  // Non-bittorrent URNs (examples from Wikipedia)
+  const magnets = [
+    'magnet:?xt=urn:sha1:PDAQRAOQQRYS76MRZJ33LK4MMVZBDSCL',
+    'magnet:?xt=urn:tree:tiger:IZZG2KNL4BKA7LYEKK5JAX6BQ27UV4QZKPL2JZQ',
+    'magnet:?xt=urn:bitprint:QBMYI5FTYSFFSP7HJ37XALYNNVYLJE27.E6ITPBX6LSBBW34T3UGPIVJDNNJZIQOMP5WNEUI',
+    'magnet:?xt=urn:ed2k:31D6CFE0D16AE931B73C59D7E0C089C0',
+    'magnet:?xt=urn:aich:D6EUDGK2DBTBEZ2XVN3G6H4CINSTZD7M',
+    'magnet:?xt=urn:kzhash:35759fdf77748ba01240b0d8901127bfaff929ed1849b9283f7694b37c192d038f535434',
+    'magnet:?xt=urn:md5:4e7bef74677be349ccffc6a178e38299'
+  ]
+
+  t.plan(magnets.length * 2 + 1)
+
+  var done = 0
+  var client = new WebTorrent({ dht: false, tracker: false })
+
+  client.on('error', function (err) {
+    t.ok(err instanceof Error)
+    t.ok(err.message.indexOf('Invalid torrent identifier') >= 0)
+
+    done += 1
+    if (done === magnets.length) client.destroy(function (err) { t.error(err, 'client destroyed') })
+  })
+  client.on('warning', function (err) { t.fail(err) })
+
+  magnets.forEach(function (magnet) {
+    client.add(magnet)
+  })
+})