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authorAdam Cammack <[email protected]>2013-02-16 02:21:54 -0600
committerAdam Cammack <[email protected]>2013-02-16 02:21:54 -0600
commitf112cdf643c520bb6554a2d8efa882e8e904b984 (patch)
tree640ef3b6570c1359345cc8f98854936ca3a67540 /examples/web_server/src/directory_handler.erl
parente3daf439da42283cf65faa3311ff73bb7ffe413b (diff)
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Add a web server example
Explore re-routing in middleware.
Diffstat (limited to 'examples/web_server/src/directory_handler.erl')
-rw-r--r--examples/web_server/src/directory_handler.erl51
1 files changed, 51 insertions, 0 deletions
diff --git a/examples/web_server/src/directory_handler.erl b/examples/web_server/src/directory_handler.erl
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+%% Feel free to use, reuse and abuse the code in this file.
+
+%% @doc Directory handler.
+-module(directory_handler).
+
+%% REST Callbacks
+-export([init/3]).
+-export([rest_init/2]).
+-export([allowed_methods/2]).
+-export([resource_exists/2]).
+-export([content_types_provided/2]).
+
+%% Callback Callbacks
+-export([list_json/2]).
+-export([list_html/2]).
+
+init(_Transport, _Req, _Paths) ->
+ {upgrade, protocol, cowboy_rest}.
+
+rest_init(Req, Paths) ->
+ {ok, Req, Paths}.
+
+allowed_methods(Req, State) ->
+ {[<<"GET">>], Req, State}.
+
+resource_exists(Req, {ReqPath, FilePath}) ->
+ case file:list_dir(FilePath) of
+ {ok, Fs} -> {true, Req, {ReqPath, lists:sort(Fs)}};
+ _Err -> {false, Req, {ReqPath, FilePath}}
+ end.
+
+content_types_provided(Req, State) ->
+ {[
+ {{<<"application">>, <<"json">>, []}, list_json},
+ {{<<"text">>, <<"html">>, []}, list_html}
+ ], Req, State}.
+
+list_json(Req, {Path, Fs}) ->
+ Files = [[ <<(list_to_binary(F))/binary>> || F <- Fs ]],
+ {jsx:encode(Files), Req, Path}.
+
+list_html(Req, {Path, Fs}) ->
+ Body = [[ links(Path, F) || F <- [".."|Fs] ]],
+ HTML = [<<"<!DOCTYPE html><html><head><title>Index</title></head>",
+ "<body>">>, Body, <<"</body></html>\n">>],
+ {HTML, Req, Path}.
+
+links(<<>>, File) ->
+ ["<a href='/", File, "'>", File, "</a><br>\n"];
+links(Prefix, File) ->
+ ["<a href='/", Prefix, $/, File, "'>", File, "</a><br>\n"].