From a0589bdf19e53ca70144eb71ec960c54e7704a87 Mon Sep 17 00:00:00 2001
From: Feross Aboukhadijeh <feross@feross.org>
Date: Wed, 5 Feb 2014 21:27:06 -0800
Subject: add metadata dl link & now opens in transmission (fix #23)

---
 chrome/style.css      |  4 ++++
 chrome/window.html    |  1 +
 lib/Torrent.js        | 55 ++++++++++++++++++++++++++++++++++-----------------
 lib/TorrentManager.js | 15 ++++++++++++--
 4 files changed, 55 insertions(+), 20 deletions(-)

diff --git a/chrome/style.css b/chrome/style.css
index cb019c5..4ecdb3a 100644
--- a/chrome/style.css
+++ b/chrome/style.css
@@ -1,4 +1,8 @@
 #console {
   height: 400px;
   overflow: scroll;
+}
+
+.highlight {
+  font-weight: bold;
 }
\ No newline at end of file
diff --git a/chrome/window.html b/chrome/window.html
index 707679f..ef700cf 100644
--- a/chrome/window.html
+++ b/chrome/window.html
@@ -12,6 +12,7 @@
       <li class="dhtNodes">DHT Nodes: <span>0</span></li>
       <li class="dhtPeers">DHT Peers: <span>0</span></li>
       <li class="connectedPeers">Connected Peers: <span>0</span></li>
+      <li class="downloadMetadata"><a href="#">Download .torrent</a></li>
     </ul>
 
     <h3>Console</h4>
diff --git a/lib/Torrent.js b/lib/Torrent.js
index f6a71ef..4cdfcbf 100644
--- a/lib/Torrent.js
+++ b/lib/Torrent.js
@@ -21,6 +21,7 @@ function Torrent (uri, opts) {
 
   this.infoHash = info.infoHash
   this.displayName = info.displayName
+  this.metadata = null
 
   this.swarm = new Swarm(this.infoHash, opts.peerId, { dht: true })
 
@@ -128,25 +129,15 @@ function Torrent (uri, opts) {
           console.log('total_size: ' + dict.total_size)
           data.copy(wire.metadata, dict.piece * METADATA_BLOCK_SIZE)
 
-          var errorHandler = function (err) {
-            console.error('error' + err.toString())
+          console.log('METADATA')
+          console.log(wire.metadata.toString())
+          this.metadata = {
+            'announce-list': [],
+            info: bncode.decode(wire.metadata),
+            // info_hash:
           }
-
-          chrome.fileSystem.chooseEntry({
-            type: 'saveFile',
-            suggestedName: this.displayName + '.torrent'
-          }, function (fileEntry) {
-            if (!fileEntry)
-              return
-
-            fileEntry.createWriter(function (writer) {
-              writer.onerror = errorHandler
-              writer.onwriteend = function (e) {
-                console.log('write complete')
-              }
-              writer.write(new Blob([wire.metadata]), { type: 'text/plain' })
-            }, errorHandler)
-          })
+          console.log(this.metadata)
+          this.emit('metadata', this.metadata)
         }
       }
     }.bind(this))
@@ -154,6 +145,34 @@ function Torrent (uri, opts) {
   }.bind(this))
 }
 
+Torrent.prototype.downloadMetadata = function () {
+  if (!this.metadata)
+    return
+
+  var errorHandler = function (err) {
+    console.error('error' + err.toString())
+  }
+
+  chrome.fileSystem.chooseEntry({
+    type: 'saveFile',
+    suggestedName: this.displayName + '.torrent'
+  }, function (fileEntry) {
+    if (!fileEntry)
+      return
+
+    fileEntry.createWriter(function (writer) {
+      writer.onerror = errorHandler
+      writer.onwriteend = function (e) {
+        console.log('write complete')
+      }
+
+      var metadata = new Buffer(bncode.encode(this.metadata))
+
+      writer.write(new Blob([metadata]), { type: 'text/plain' })
+    }.bind(this), errorHandler)
+  }.bind(this))
+}
+
 Object.defineProperty(Torrent.prototype, 'numPeers', {
   get: function () {
     return this.swarm.wires.length
diff --git a/lib/TorrentManager.js b/lib/TorrentManager.js
index 265ef26..8c3e570 100644
--- a/lib/TorrentManager.js
+++ b/lib/TorrentManager.js
@@ -69,18 +69,28 @@ TorrentManager.prototype.add = function (uri) {
     // TODO: Add the torrent to the public DHT so peers know to find up
   })
 
+  torrent.on('metadata', this.updateUI.bind(this))
+
   this.dht.setInfoHash(torrent.infoHash)
   this.dht.findPeers(MAX_PEERS) // TODO: should the DHT be concerned with max peers?
 
   this.updateUI()
+
+  var t = this.torrents['d2474e86c95b19b8bcfdb92bc12c9d44667cfa36']
+  $('.downloadMetadata').click(function () {
+    t.downloadMetadata()
+  })
 }
 
 // TODO: show multiple torrents
 TorrentManager.prototype.updateUI = function () {
   // console.log('Peer ID: ' + this.peerId.toString('utf8'))
   // console.log('Node ID: ' + this.nodeId.toString('hex'))
-  $('.infoHash span').text(this.torrents['d2474e86c95b19b8bcfdb92bc12c9d44667cfa36'].infoHash)
-  $('.displayName span').text(this.torrents['d2474e86c95b19b8bcfdb92bc12c9d44667cfa36'].displayName)
+
+  var t = this.torrents['d2474e86c95b19b8bcfdb92bc12c9d44667cfa36']
+
+  $('.infoHash span').text(t.infoHash)
+  $('.displayName span').text(t.displayName)
 
   $('.dhtNodes span').text(Object.keys(this.dht.nodes).length)
   $('.dhtPeers span').text(Object.keys(this.dht.peers).length)
@@ -91,5 +101,6 @@ TorrentManager.prototype.updateUI = function () {
     connectedPeers += torrent.numPeers
   }
   $('.connectedPeers span').text(connectedPeers)
+  $('.downloadMetadata').toggleClass('highlight', !!t.metadata)
 }
 
-- 
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