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Add a web server example

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Explore re-routing in middleware.
This commit is contained in:
Adam Cammack 2013-02-16 02:21:54 -06:00
parent e3daf439da
commit f112cdf643
14 changed files with 223 additions and 0 deletions
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51
examples/web_server/src/directory_handler.erl Normal file
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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"].