[node] Working in fetch magnet code

node/fetch_magnet.js

@@ -0,0 +1,17 @@
+const jlibtorrent = require('./jlibtorrent.js');
+
+console.log("Using libtorrent version: " + jlibtorrent.LibTorrent.fullVersion());
+
+const l = function (a) {
+    console.log(a.type() + " - " + a.what() + " - " + a.message());
+}
+
+const sp = new jlibtorrent.SettingsPack();
+const s = new jlibtorrent.Session(sp, false, l);
+
+s.fetchMagnet("magnet:?xt=urn:btih:a83cc13bf4a07e85b938dcf06aa707955687ca7c");
+
+process.stdout.write('Press ENTER to exit...');
+process.stdin.once('data', function (data) {
+    process.exit(0);
+});

node/jlibtorrent.js

@@ -170,6 +170,35 @@ const swig = require('./jlibtorrent.node');
         return this.sp;
     }
 
+    Session.prototype.fetchMagnet = function (uri) {
+        var p = swig.add_torrent_params.create_instance_disabled_storage();
+        var ec = new swig.error_code();
+        swig.parse_magnet_uri(uri, p, ec);
+
+        if (ec.value() != 0) {
+            throw ec.message();
+        }
+
+        var info_hash = p.info_hash;
+
+        var th = this.s.find_torrent(info_hash);
+        if (th && th.is_valid()) {
+            // we have a download with the same info-hash, improve this
+            return;
+        }
+
+        p.name = "fetch_magnet:" + uri;
+        p.save_path = "fetch_magnet/" + uri;
+
+        var flags = p.flags;
+        flags &= ~swig.add_torrent_params.flag_auto_managed;
+        p.flags = flags;
+
+        ec.clear();
+        th = this.s.add_torrent(p, ec);
+        th.resume();
+    }
+
     exports.Session = Session;
 
 }());