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%% Feel free to use, reuse and abuse the code in this file.
-module(http_body_qs).
-export([init/2]).
init(Req, Opts) ->
Method = cowboy_req:method(Req),
HasBody = cowboy_req:has_body(Req),
{ok, maybe_echo(Method, HasBody, Req), Opts}.
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).
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