partial implementation of rfc 7233 for cowboy_rest

[s-kostyaev]

For full imlementation multipart/byteranges reply need to be implemented in cowboy.

[s-kostyaev]

You can see how to use it in this example:

%% callback for content type with ranges support
get_file(Req, State = #state{filepath = FilePath, is_range = true, range_offset = Offset, range_bytes = Bytes}) ->
    SendFile = fun(Socket, Transport) ->
        case Transport:sendfile(Socket, FilePath, Offset, Bytes) of
            {ok, _} -> ok;
            {error, closed} -> ok;
            {error, etimedout} -> ok
        end
               end,
    {{stream, Bytes, SendFile}, Req, State};
get_file(Req, State = #state{filepath = FilePath, file_info = #file_info{size = Size}}) ->
    SendFile = fun(Socket, Transport) ->
        case Transport:sendfile(Socket, FilePath) of
            {ok, _} -> ok;
            {error, closed} -> ok;
            {error, etimedout} -> ok
        end
               end,
    {{stream, Size, SendFile}, Req, State}.

%% callback for using http ranges
range_satisfiable(Req, State = #state{file_info = #file_info{size = Size}}) ->
    case cowboy_rest:range_satisfiable(Req, Size) of
        {true, Req1, Offset, Bytes} ->
            {true, Req1, State#state{is_range = true, range_offset = Offset,
                                     range_bytes = Bytes}};
        _ ->
            {false, Req, State#state{is_range = false}}
    end.

[essen]

Multipart is already supported so I'm not sure what you mean.

[s-kostyaev]

@essen please add link to doc. I need reply from cowboy with multipart, not receive multipart in cowboy.

[essen]

cow_multipart, no docs yet.

[s-kostyaev]

Thanks. We use branch 1.0. Maybe we complete rfc 7233 implementation later. Or you can merge this partial implementation and complete it yourself.

[s-kostyaev]

For now this implementation works fine with <audio> tag in firefox and google chrome.

[essen]

I've started working on a full implementation of RFC7233. I may or may not take inspiration or some code from this PR. In the meantime I'll close it. Thanks!