%% This module enables compression and returns deflate
%% options depending on the query string.
-module(ws_deflate_opts_h).
-behavior(cowboy_websocket).
-export([init/2]).
-export([websocket_handle/2]).
-export([websocket_info/2]).
init(Req=#{qs := Qs}, State) ->
{Name, Value} = case Qs of
<<"server_context_takeover">> -> {server_context_takeover, takeover};
<<"server_no_context_takeover">> -> {server_context_takeover, no_takeover};
<<"client_context_takeover">> -> {client_context_takeover, takeover};
<<"client_no_context_takeover">> -> {client_context_takeover, no_takeover};
<<"server_max_window_bits">> -> {server_max_window_bits, 9};
<<"client_max_window_bits">> -> {client_max_window_bits, 9};
<<"level">> -> {level, best_speed};
<<"mem_level">> -> {mem_level, 1};
<<"strategy">> -> {strategy, rle}
end,
{cowboy_websocket, Req, State, #{
compress => true,
deflate_opts => #{Name => Value}
}}.
websocket_handle({text, Data}, State) ->
{[{text, Data}], State};
websocket_handle({binary, Data}, State) ->
{[{binary, Data}], State};
websocket_handle(_, State) ->
{[], State}.
websocket_info(_, State) ->
{[], State}.
