big refactor

app/routes/download.js

@@ -1,12 +1,60 @@
 const preview = require('../templates/preview');
 const download = require('../templates/download');
+const notFound = require('../templates/notFound');
+const downloadPassword = require('../templates/downloadPassword');
+const downloadButton = require('../templates/downloadButton');
+
+function hasFileInfo() {
+  return !!document.getElementById('dl-file');
+}
+
+function getFileInfoFromDOM() {
+  const el = document.getElementById('dl-file');
+  if (!el) {
+    return null;
+  }
+  return {
+    nonce: el.getAttribute('data-nonce'),
+    requiresPassword: !!+el.getAttribute('data-requires-password')
+  };
+}
+
+function createFileInfo(state) {
+  const metadata = getFileInfoFromDOM();
+  return {
+    id: state.params.id,
+    secretKey: state.params.key,
+    nonce: metadata.nonce,
+    requiresPassword: metadata.requiresPassword
+  };
+}
 
 module.exports = function(state, emit) {
+  if (!state.fileInfo) {
+    // This is a fresh page load
+    // We need to parse the file info from the server's html
+    if (!hasFileInfo()) {
+      return notFound(state, emit);
+    }
+    state.fileInfo = createFileInfo(state);
+
+    if (!state.fileInfo.requiresPassword) {
+      emit('getMetadata');
+    }
+  }
+
+  let pageAction = ''; //default state: we don't have file metadata
   if (state.transfer) {
     const s = state.transfer.state;
     if (s === 'downloading' || s === 'complete') {
+      // Downloading is in progress
       return download(state, emit);
     }
+    // we have file metadata
+    pageAction = downloadButton(state, emit);
+  } else if (state.fileInfo.requiresPassword && !state.fileInfo.password) {
+    // we're waiting on the user for a valid password
+    pageAction = downloadPassword(state, emit);
   }
-  return preview(state, emit);
+  return preview(state, pageAction);
 };