Hooks for loopback file storage: after/before uploads, downloads etc.

container.js

/**
 * Want to search github for sample code?
 * Use the following `search criteria` in the github.com `search box` and then select `Code` from the search results:
 *     container upload remote language:javascript path:/common/models
 */
module.exports = function(Container) {

  Container.beforeRemote('**', function(ctx, unused, next) {
    console.log('4: good');
    console.log('5: ctx.methodString', ctx.methodString);
    if(ctx.methodString === 'container.upload') {
      console.log('7: good');
      next();
    } else {
      next();
    }
  }); // works

  Container.afterRemote('**', function(ctx, unused, next) {
    console.log('15: good');
    console.log('16: ctx.methodString', ctx.methodString);
    if(ctx.methodString === 'container.upload') {
      console.log('18: good');
      next();
    } else {
      next();
    }
  }); // works

  Container.afterRemote('upload', function(ctx, unused, next) {
    console.log('www: good');
    next();
  }); // works

  // practical example
  Container.afterRemote('upload', function(ctx, unused, next) {
    console.log('vvv: good');
    var files = ctx.result.result.files.file;
    console.log('vvv: FILE(S) UPLOADED: %j', files);
    // TODO - process all items in `files` array
    var item = files[0];
    var stream = Container.downloadStream(item.container, item.name);
    stream.pipe(process.stdout);
    stream.on('end', function() { next(); });
    stream.on('error', next);
  }); // works

  Container.beforeRemote('*.upload', function(ctx, unused, next) {
    console.log('xxx: good');
    next();
  }); // fails

  Container.beforeRemote('*.container.upload', function(ctx, unused, next) {
    console.log('yyy: good');
    next();
  }); // fails

  Container.beforeRemote('container.upload', function(ctx, unused, next) {
    console.log('zzz: good');
    next();
  }); // fails

};

Hello,

First of all, thank for this code.

I am trying to change the name of the file before it is uploaded to Amazon container. How can I achieve this? How can we access file name in beforeRemote?