Use the REST handler instead of the default one.

This makes the code simpler and more manageable.

dudeswave/src/dudeswave_handler.erl

@@ -24,7 +24,9 @@ else is considered a bad request, apart from the obvious case of 500
 
 -behaviour(cowboy_handler).
 
--export([init/2, terminate/3]).
+-export([init/2, terminate/3, allowed_methods/2,
+    content_types_provided/2, known_methods/2,
+    resource_exists/2, send_body/2]).
 
 -include_lib("storage/include/storage.hrl").
 
@@ -33,57 +35,27 @@ else is considered a bad request, apart from the obvious case of 500
 %
 
 init(Req, State) ->
+	{cowboy_rest, Req, State}.
+
+allowed_methods(Req, State) ->
+	{[<<"GET">>], Req, State}.
+
+content_types_provided(Req, State) ->
+	{[{{'*'}, send_body}], Req, State}.
+
+known_methods(Req, State) ->
+	{[<<"GET">>], Req, State}.
+
+resource_exists(Req, State) ->
 	{ok, Bucket} = maps:find(bucket, State),
 	Path = cowboy_req:path(Req),
 
-	case cowboy_req:method(Req) of
-		<<"GET">> ->
-			%
-			% Fetch the page from storage
-			%
 	case storage:read(Bucket, Path) of
-				{ok, []} ->
+		{ok, [R]} -> {true, Req, R};
-					Resp = cowboy_req:reply(404,
+		_ -> {false, Req, []}
-					    #{<<"content-type">> => <<"text/plain">>}, <<"Not found">>, Req),
-					{ok, Resp, State};
-				%
-				% If we get a resource, send it back to the client with
-				% it's proper mime type.
-				%
-				{ok, [R]} ->
-					{Mime, Bin} = get_final_object(R),
-					Resp = cowboy_req:reply(200, #{<<"content-type">> => Mime},
-					    Bin, Req),
-					{ok, Resp, State};
-				{error, _} ->
-					Resp = cowboy_req:reply(500, #{<<"content-type">> => <<"text/plain">>},
-					    <<"Internal server error">>, Req),
-					{ok, Resp, State}
-			end;
-		_ ->
-			Resp = cowboy_req:reply(400, #{<<"content-type">> => <<"text/plain">>},
-			    <<"Bad request">>, Req),
-			{ok, Resp, State}
 	end.
 
+send_body(Req, Record) ->
+	{Record#object.value, Req, '_'}.
+
 terminate(_Reason, _Req, _State) -> ok.
-
--spec get_final_object(Record) -> {Mime, Bin} when
-	Record :: storage:object(),
-	Mime :: binary(),
-	Bin :: binary().
-
-get_final_object(Record) ->
-	case lists:keyfind(mime, 1, Record#object.metadata) of
-		%
-		% We do not know the object mime type. This should never
-		% happen.
-		%
-		false ->
-			{<<"application/octect-stream">>, Record#object.value};
-		%
-		% Everything else, just return it as is.
-		%
-		{mime, Mime} ->
-			{list_to_binary(Mime), Record#object.value}
-	end.