add tracing and refactor some api pkgs

internal/api/http/middleware/cors_interceptor.go

@@ -0,0 +1,47 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/rs/cors"
+
+	"github.com/caos/zitadel/internal/api"
+)
+
+var (
+	DefaultCORSOptions = cors.Options{
+		AllowCredentials: true,
+		AllowedHeaders: []string{
+			api.Origin,
+			api.ContentType,
+			api.Accept,
+			api.AcceptLanguage,
+			api.Authorization,
+			api.ZitadelOrgID,
+			"x-grpc-web", //TODO: needed
+		},
+		AllowedMethods: []string{
+			http.MethodOptions,
+			http.MethodGet,
+			http.MethodHead,
+			http.MethodPost,
+			http.MethodPut,
+			http.MethodPatch,
+			http.MethodDelete,
+		},
+		ExposedHeaders: []string{
+			api.Location,
+		},
+		AllowedOrigins: []string{
+			"http://localhost:*",
+		},
+	}
+)
+
+func CORSInterceptorOpts(opts cors.Options, h http.Handler) http.Handler {
+	return cors.New(opts).Handler(h)
+}
+
+func CORSInterceptor(h http.Handler) http.Handler {
+	return CORSInterceptorOpts(DefaultCORSOptions, h)
+}

internal/api/http/middleware/trace_interceptor.go

@@ -0,0 +1,12 @@
+package middleware
+
+import (
+	"net/http"
+
+	"github.com/caos/zitadel/internal/api"
+	"github.com/caos/zitadel/internal/tracing"
+)
+
+func DefaultTraceHandler(handler http.Handler) http.Handler {
+	return tracing.TraceHandler(handler, api.Probes...)
+}