set the mime type in the download blob

frontend/src/download.js

@@ -57,7 +57,8 @@ function download() {
       }
       throw err;
     })
-    .then(([decrypted, fname]) => {
+    .then(([decrypted, file]) => {
+      const fname = file.name;
       const endTime = Date.now();
       const time = endTime - startTime;
       const downloadTime = endTime - downloadEnd;
@@ -73,7 +74,7 @@ function download() {
         });
 
       const dataView = new DataView(decrypted);
-      const blob = new Blob([dataView]);
+      const blob = new Blob([dataView], { type: file.type });
       const downloadUrl = URL.createObjectURL(blob);
 
       const a = document.createElement('a');

frontend/src/fileReceiver.js

@@ -39,13 +39,15 @@ class FileReceiver extends EventEmitter {
             }
 
             const blob = new Blob([this.response]);
+            const type = xhr.getResponseHeader('Content-Type');
+            const meta = JSON.parse(xhr.getResponseHeader('X-File-Metadata'));
             const fileReader = new FileReader();
             fileReader.onload = function() {
-              const meta = JSON.parse(xhr.getResponseHeader('X-File-Metadata'));
               resolve([
                 {
                   data: this.result,
                   filename: meta.filename,
+                  type,
                   iv: meta.id
                 },
                 key
@@ -76,7 +78,10 @@ class FileReceiver extends EventEmitter {
             .then(decrypted => {
               return Promise.resolve(decrypted);
             }),
-          decodeURIComponent(fdata.filename)
+          {
+            name: decodeURIComponent(fdata.filename),
+            type: fdata.type
+          }
         ]);
       });
   }

server/server.js

@@ -168,7 +168,7 @@ app.get('/assets/download/:id', async (req, res) => {
     const contentLength = await storage.length(id);
     res.writeHead(200, {
       'Content-Disposition': `attachment; filename=${meta.filename}`,
-      'Content-Type': 'application/octet-stream',
+      'Content-Type': meta.mimeType,
       'Content-Length': contentLength,
       'X-File-Metadata': JSON.stringify(meta)
     });
@@ -236,24 +236,27 @@ app.post('/upload', (req, res, next) => {
   meta.delete = crypto.randomBytes(10).toString('hex');
   req.pipe(req.busboy);
 
-  req.busboy.on('file', async (fieldname, file, filename) => {
-    try {
-      await storage.set(newId, file, filename, meta);
-
-      const protocol = conf.env === 'production' ? 'https' : req.protocol;
-      const url = `${protocol}://${req.get('host')}/download/${newId}/`;
-      res.json({
-        url,
-        delete: meta.delete,
-        id: newId
-      });
-    } catch (e) {
-      if (e.message === 'limit') {
-        return res.sendStatus(413);
+  req.busboy.on(
+    'file',
+    async (fieldname, file, filename, encoding, mimeType) => {
+      try {
+        meta.mimeType = mimeType || 'application/octet-stream';
+        await storage.set(newId, file, filename, meta);
+        const protocol = conf.env === 'production' ? 'https' : req.protocol;
+        const url = `${protocol}://${req.get('host')}/download/${newId}/`;
+        res.json({
+          url,
+          delete: meta.delete,
+          id: newId
+        });
+      } catch (e) {
+        if (e.message === 'limit') {
+          return res.sendStatus(413);
+        }
+        res.sendStatus(500);
       }
-      res.sendStatus(500);
     }
-  });
+  );
 
   req.on('close', async err => {
     try {

test/server/server.test.js

@@ -163,7 +163,7 @@ describe('Server integration tests', function() {
         res.header['content-disposition'],
         'attachment; filename=test_upload.txt'
       );
-      assert.equal(res.header['content-type'], 'application/octet-stream');
+      assert.equal(res.header['content-type'], 'text/plain');
     });
   });
 

webpack.config.js

@@ -14,8 +14,15 @@ module.exports = {
       {
         test: /\.js$/,
         loaders: 'babel-loader',
-        include: [path.resolve(__dirname, 'frontend'), path.resolve(__dirname, 'node_modules/testpilot-ga/src')],
-        query: { babelrc: false, presets: ['es2015', 'stage-2'], plugins: ['add-module-exports'] }
+        include: [
+          path.resolve(__dirname, 'frontend'),
+          path.resolve(__dirname, 'node_modules/testpilot-ga/src')
+        ],
+        query: {
+          babelrc: false,
+          presets: ['es2015', 'stage-2'],
+          plugins: ['add-module-exports']
+        }
       }
     ]
   }