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%% Feel free to use, reuse and abuse the code in this file.
%% @doc POST echo handler.
-module(toppage_handler).
-export([init/3]).
-export([handle/2]).
-export([terminate/2]).
init(_Transport, Req, []) ->
{ok, Req, undefined}.
handle(Req, State) ->
{Method, Req2} = cowboy_req:method(Req),
{HasBody, Req3} = cowboy_req:has_body(Req2),
{ok, Req4} = maybe_echo(Method, HasBody, Req3),
{ok, Req4, State}.
maybe_echo('POST', true, Req) ->
{PostVals, Req2} = cowboy_req:body_qs(Req),
Echo = proplists:get_value(<<"echo">>, PostVals),
echo(Echo, Req2);
maybe_echo('POST', false, Req) ->
cowboy_req:reply(400, [], <<"Missing body.">>, Req);
maybe_echo(_, _, Req) ->
%% Method not allowed.
cowboy_req:reply(405, Req).
echo(undefined, Req) ->
cowboy_req:reply(400, [], <<"Missing echo parameter.">>, Req);
echo(Echo, Req) ->
cowboy_req:reply(200,
[{<<"Content-Encoding">>, <<"utf-8">>}], Echo, Req).
terminate(_Req, _State) ->
ok.
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