%% Feel free to use, reuse and abuse the code in this file.
-module(http_body_qs).
-behaviour(cowboy_http_handler).
-export([init/3, handle/2, terminate/3]).
init({_, http}, Req, _) ->
{ok, Req, undefined}.
handle(Req, State) ->
{Method, Req2} = cowboy_req:method(Req),
HasBody = cowboy_req:has_body(Req2),
{ok, Req3} = maybe_echo(Method, HasBody, Req2),
{ok, Req3, State}.
maybe_echo(<<"POST">>, true, Req) ->
case cowboy_req:body_qs(Req) of
{badlength, Req2} ->
echo(badlength, Req2);
{ok, PostVals, Req2} ->
echo(proplists:get_value(<<"echo">>, PostVals), Req2)
end;
maybe_echo(<<"POST">>, false, Req) ->
cowboy_req:reply(400, [], <<"Missing body.">>, Req);
maybe_echo(_, _, Req) ->
%% Method not allowed.
cowboy_req:reply(405, Req).
echo(badlength, Req) ->
cowboy_req:reply(413, [], <<"POST body bigger than 16000 bytes">>, Req);
echo(undefined, Req) ->
cowboy_req:reply(400, [], <<"Missing echo parameter.">>, Req);
echo(Echo, Req) ->
cowboy_req:reply(200, [
{<<"content-type">>, <<"text/plain; charset=utf-8">>}
], Echo, Req).
terminate(_, _, _) ->
ok.
