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-module(rest_resource_etags).
-export([init/2]).
-export([generate_etag/2]).
-export([content_types_provided/2]).
-export([get_text_plain/2]).
init(Req, Opts) ->
{cowboy_rest, Req, Opts}.
generate_etag(Req, State) ->
#{type := Type} = cowboy_req:match_qs([type], Req),
case Type of
%% Correct return values from generate_etag/2.
<<"tuple-weak">> ->
{{weak, <<"etag-header-value">>}, Req, State};
<<"tuple-strong">> ->
{{strong, <<"etag-header-value">>}, Req, State};
%% Backwards compatible return values from generate_etag/2.
<<"binary-weak-quoted">> ->
{<<"W/\"etag-header-value\"">>, Req, State};
<<"binary-strong-quoted">> ->
{<<"\"etag-header-value\"">>, Req, State};
%% Invalid return values from generate_etag/2.
<<"binary-strong-unquoted">> ->
cowboy_error_h:ignore(cowboy_http, quoted_string, 2),
{<<"etag-header-value">>, Req, State};
<<"binary-weak-unquoted">> ->
cowboy_error_h:ignore(cowboy_http, quoted_string, 2),
{<<"W/etag-header-value">>, Req, 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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