Add set_resp_header/3 and set_resp_body/2 to cowboy_http_req

These functions allow to set response headers and body in advance,
before calling any of the reply functions.

Also add has_resp_header/2 and has_resp_body/1 to check if the given
response headers have already been set.

1 files changed, 31 insertions, 0 deletions

diff --git a/test/http_handler_set_resp.erl b/test/http_handler_set_resp.erl
new file mode 100644
index 0000000..6aca73d
--- /dev/null
+++ b/test/http_handler_set_resp.erl
@@ -0,0 +1,31 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+-module(http_handler_set_resp).
+-behaviour(cowboy_http_handler).
+-export([init/3, handle/2, terminate/2]).
+
+init({_Transport, http}, Req, Opts) ->
+	Headers = proplists:get_value(headers, Opts, []),
+	Body = proplists:get_value(body, Opts, <<"http_handler_set_resp">>),
+	{ok, Req2} = lists:foldl(fun({Name, Value}, {ok, R}) ->
+		cowboy_http_req:set_resp_header(Name, Value, R)
+	end, {ok, Req}, Headers),
+	{ok, Req3} = cowboy_http_req:set_resp_body(Body, Req2),
+	{ok, Req4} = cowboy_http_req:set_resp_header(
+		<<"X-Cowboy-Test">>, <<"ok">>, Req3),
+	{ok, Req4, undefined}.
+
+handle(Req, State) ->
+	case cowboy_http_req:has_resp_header(<<"X-Cowboy-Test">>, Req) of
+		false -> {ok, Req, State};
+		true ->
+			case cowboy_http_req:has_resp_body(Req) of
+				false -> {ok, Req, State};
+				true ->
+					{ok, Req2} = cowboy_http_req:reply(200, Req),
+					{ok, Req2, State}
+			end
+	end.
+
+terminate(_Req, _State) ->
+	ok.