How to change file name after completed upload?

[paulklemm]

I have problem similar to flowjs/flow-php-server#10.

I use the Nodejs example (https://github.com/flowjs/flow.js/tree/master/samples/Node.js) as foundation for my server and everything works fine. When all chunks are uploaded, I assemble the file and then I rename it based on a hash calculated using the file content.

How can I let flow.js know that the file name was changed manually and how can I add this information on an event (e.g. fileSuccess). I assume the proper way would be to change the filename in the result object.

The corresponding method in the app.js node server is:

app.post('/upload', multipartMiddleware, function(req, res) {
  flow.post(req, function(status, filename, original_filename, identifier) {
    if (status == 'done') {
      var filepath = UPLOAD_DIR + filename;
      var stream = fs.createWriteStream(filepath);
      console.log(identifier);
      flow.write(identifier, stream);
      flow.clean(identifier);

      // Here I calculate a hash based on the uploaded file and rename it accordingly.
      getHashFromFile(UPLOAD_DIR, filename, function(hash){
        var extension = path.extname(filename);
        fs.rename(UPLOAD_DIR + filename, UPLOAD_DIR + hash + extension, function(err) {
          if ( err ) console.log('ERROR: ' + err);
        });
      });
    }
    if (ACCESS_CONTROLL_ALLOW_ORIGIN) {
      res.header("Access-Control-Allow-Origin", "*");
    }
    res.status(status).send();
  });
});

I've uploaded the entire file as Gist here: https://gist.github.com/Powernap/36c9b7b1701016ddc03d

[AidasK]

Have you found a solution? I think you only need to make a separate Http request to the server with a new file name or you can rename it before the upload.

[paulklemm]

The problem is that in my case the server determines the new file name based on a hash calculated based on its content. This (for large files rather heavy computation) should always be carried out server-side.

A (rather hacky) solution would be to emit an server-side event to the client using sockets. I however think that this should be done through the flow.js API.

[AidasK]

So it is even simpler, you just need to wait for upload to be completed. fileSuccess event will have your server side response as text. So all you need to do is to parse the response and set new file name.

function success(file, message) {
console.log(message);
var json = JSON.parse(message);
file.name = json.new_file_name;
// update ui ...
}

[paulklemm]

Works like a charm, thanks! 👍