extend/cowboy file upload

neo_handler_multipart.erl

-module(neo_handler_multipart).
-behaviour(cowboy_http_handler).
-export([init/3, handle/2, terminate/2]).

init({_Transport, http}, Req, []) ->
  {ok, Req, {}}.

handle(Req, State) ->
	{Result, Req2} = acc_multipart(Req),
	writeToFile(term_to_binary(Result)),
	{ok, Req3} = cowboy_req:reply(200, [], term_to_binary(Result), Req2),
	{ok, Req3, State}.

terminate(_Req, _State) ->
	ok.

acc_multipart(Req) ->
	acc_multipart(cowboy_req:multipart_data(Req), []).

acc_multipart({headers, Headers, Req}, Acc) ->
	acc_multipart(cowboy_req:multipart_data(Req), []);
acc_multipart({body, Data, Req}, _) ->
	acc_multipart(cowboy_req:multipart_data(Req), Data);
acc_multipart({end_of_part, Req}, Data) ->
	acc_multipart(cowboy_req:multipart_data(Req), Data);
acc_multipart({eof, Req}, Data) ->
	{Data, Req}.


writeToFile(Result) ->
	file:write("/tmp/out.bin", Result, [write, binary]),
	ok.