add cors option

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

go.mod

@@ -5,17 +5,19 @@ go 1.18
 require (
 	go.unistack.org/micro-codec-yaml/v3 v3.10.0
 	go.unistack.org/micro-proto/v3 v3.3.1
-	go.unistack.org/micro/v3 v3.10.42
-	golang.org/x/net v0.14.0
+	go.unistack.org/micro/v3 v3.10.52
+	golang.org/x/net v0.22.0
 )
 
 require (
-	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/google/gnostic v0.6.9 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230526203410-71b5a4ffd15e // indirect
-	google.golang.org/grpc v1.57.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/gnostic v0.7.0 // indirect
+	github.com/google/gnostic-models v0.6.9-0.20230804172637-c7be7c783f49 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c // indirect
+	google.golang.org/grpc v1.62.1 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	sigs.k8s.io/yaml v1.3.0 // indirect
+	sigs.k8s.io/yaml v1.4.0 // indirect
 )

http.go

@@ -35,6 +35,7 @@ type Server struct {
 	pathHandlers *rhttp.Trie
 	opts         server.Options
 	registerRPC  bool
+	registerCORS bool
 	sync.RWMutex
 	registered bool
 	init       bool
@@ -84,6 +85,10 @@ func (h *Server) Init(opts ...server.Option) error {
 		h.registerRPC = v
 	}
 
+	if v, ok := h.opts.Context.Value(registerCORSHandlerKey{}).(bool); ok {
+		h.registerCORS = v
+	}
+
 	if phs, ok := h.opts.Context.Value(pathHandlerKey{}).(*pathHandlerVal); ok && phs.h != nil {
 		for pm, ps := range phs.h {
 			for pp, ph := range ps {
@@ -227,6 +232,13 @@ func (h *Server) NewHandler(handler interface{}, opts ...server.HandlerOption) s
 			h.opts.Logger.Errorf(h.opts.Context, "cant add handler for %s %s", md["Method"], md["Path"])
 		}
 
+		if h.registerCORS {
+			h.opts.Logger.Infof(h.opts.Context, "register cors handler for http.MethodOptions %s /%s", hn, hn)
+			if err := hdlr.handlers.Insert([]string{http.MethodOptions}, "/"+hn, pth); err != nil {
+				h.opts.Logger.Errorf(h.opts.Context, "cant add rpc handler for http.MethodOptions %s /%s", hn, hn)
+			}
+		}
+
 		if h.registerRPC {
 			h.opts.Logger.Infof(h.opts.Context, "register rpc handler for http.MethodPost %s /%s", hn, hn)
 			if err := hdlr.handlers.Insert([]string{http.MethodPost}, "/"+hn, pth); err != nil {

options.go

@@ -133,6 +133,13 @@ func RegisterRPCHandler(b bool) server.Option {
 	return server.SetOption(registerRPCHandlerKey{}, b)
 }
 
+type registerCORSHandlerKey struct{}
+
+// RegisterCORSHandler registers cors endpoints with /ServiceName.ServiceEndpoint method POPTIONSOST
+func RegisterCORSHandler(b bool) server.Option {
+	return server.SetOption(registerCORSHandlerKey{}, b)
+}
+
 type handlerEndpointsKey struct{}
 
 type EndpointMetadata struct {