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-module(rest_resource_etags).
-export([init/3, generate_etag/2, content_types_provided/2, get_text_plain/2]).
init(_Transport, _Req, _Opts) ->
{upgrade, protocol, cowboy_rest}.
generate_etag(Req, State) ->
case cowboy_req:qs_val(<<"type">>, Req) of
%% Correct return values from generate_etag/2.
{<<"tuple-weak">>, Req2} ->
{{weak, <<"etag-header-value">>}, Req2, State};
{<<"tuple-strong">>, Req2} ->
{{strong, <<"etag-header-value">>}, Req2, State};
%% Backwards compatible return values from generate_etag/2.
{<<"binary-weak-quoted">>, Req2} ->
{<<"W/\"etag-header-value\"">>, Req2, State};
{<<"binary-strong-quoted">>, Req2} ->
{<<"\"etag-header-value\"">>, Req2, State};
%% Invalid return values from generate_etag/2.
{<<"binary-strong-unquoted">>, Req2} ->
cowboy_error_h:ignore(cowboy_http, quoted_string, 2),
{<<"etag-header-value">>, Req2, State};
{<<"binary-weak-unquoted">>, Req2} ->
cowboy_error_h:ignore(cowboy_http, quoted_string, 2),
{<<"W/etag-header-value">>, Req2, State}
end.
content_types_provided(Req, State) ->
{[{{<<"text">>, <<"plain">>, []}, get_text_plain}], Req, State}.
get_text_plain(Req, State) ->
{<<"This is REST!">>, Req, State}.
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