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%% Feel free to use, reuse and abuse the code in this file.

-module(http_body_qs).

-export([init/2]).
-export([handle/2]).

init(Req, Opts) ->
	{http, Req, Opts}.

handle(Req, State) ->
	Method = cowboy_req:method(Req),
	HasBody = cowboy_req:has_body(Req),
	{ok, maybe_echo(Method, HasBody, Req), 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).