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Diffstat (limited to 'examples/file_server/src/directory_lister.erl')
-rw-r--r-- | examples/file_server/src/directory_lister.erl | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/examples/file_server/src/directory_lister.erl b/examples/file_server/src/directory_lister.erl new file mode 100644 index 0000000..2ca9d30 --- /dev/null +++ b/examples/file_server/src/directory_lister.erl @@ -0,0 +1,32 @@ +%% Feel free to use, reuse and abuse the code in this file. + +-module(directory_lister). +-behaviour(cowboy_middleware). + +-export([execute/2]). + +execute(Req, Env=#{handler := cowboy_static}) -> + redirect_directory(Req, Env); +execute(Req, Env) -> + {ok, Req, Env}. + +redirect_directory(Req, Env=#{handler_opts := {_, _, _, Extra}}) -> + Path = cowboy_req:path_info(Req), + Path1 = << <<S/binary, $/>> || S <- Path >>, + {dir_handler, DirHandler} = lists:keyfind(dir_handler, 1, Extra), + FullPath = resource_path(Path1), + case valid_path(Path) and filelib:is_dir(FullPath) of + true -> handle_directory(Req, Env, Path1, FullPath, DirHandler); + false -> {ok, Req, Env} + end. + +handle_directory(Req, Env, Prefix, Path, DirHandler) -> + {ok, Req, Env#{handler => DirHandler, handler_opts => {Prefix, Path}}}. + +valid_path([]) -> true; +valid_path([<<"..">> | _T]) -> false; +valid_path([<<"/", _/binary>> | _T]) -> false; +valid_path([_H | Rest]) -> valid_path(Rest). + +resource_path(Path) -> + filename:join([code:priv_dir(file_server), Path]). |