Publish metadata and contract sources

src/app.js

 /* global alert, confirm, prompt, FileReader, Option, Worker, chrome */
 'use strict'
 
+var async = require('async')
 var $ = require('jquery')
 var base64 = require('js-base64').Base64
 var swarmgw = require('swarmgw')
@@ -657,13 +658,53 @@ var run = function () {
     })
   }
 
+  function publishOnSwarm (contract, cb) {
+    // gather list of files to publish
+    var sources = []
+
+    sources.push({
+      content: contract.metadata,
+      hash: contract.metadataHash
+    })
+
+    var metadata
+    try {
+      metadata = JSON.parse(contract.metadata)
+    } catch (e) {
+      return cb(e)
+    }
+
+    if (metadata === undefined) {
+      return cb('No metadata')
+    }
+
+    Object.keys(metadata.sources).forEach(function (fileName) {
+      // find hash
+      var hash
+      try {
+        hash = metadata.sources[fileName].urls[0].match('bzzr://(.+)')[1]
+      } catch (e) {
+        return cb('Metadata inconsistency')
+      }
+
+      sources.push({
+        content: files.get(fileName),
+        hash: hash
+      })
+    })
+
+    // publish the list of sources in order, fail if any failed
+    async.eachSeries(sources, function (item, cb) {
+      swarmVerifiedPublish(item.content, item.hash, cb)
+    }, cb)
+  }
+
   udapp.event.register('publishContract', this, function (contract) {
-    console.log('Publish contract...', contract)
-    swarmVerifiedPublish(contract.metadata, contract.metadataHash, function (err) {
+    publishOnSwarm(contract, function (err) {
       if (err) {
         alert('Failed to publish metadata: ' + err)
       } else {
-        alert('Published metadata')
+        alert('Metadata published successfully')
       }
     })
   })