RESTful API for Spark

[Ognen Duzlevski]

Hello,

I am constructing a data pipeline which relies on Spark. As part of this 
exercise, I would like to provide my users a web based interface to 
submit queries that would translate into Spark jobs. So, something like 
"user enters dates and other criteria for e.g. retention analysis" => 
this ends up being some kind of a RESTful API call with appropriate json 
sent to server => this ends up being some kind of a spark 
.filter.map.reduceByKey thing => this ends up sending a json formatted 
reply back to web interface.

Is there anything available now to take care of the RESTful step? If 
not, how are people going about setting up this "mini" workflow?

Thanks!
Ognen