feat: initial public version

server/middleware.go

@@ -0,0 +1,19 @@
+// HTTP middlewares.
+package server
+
+import "net/http"
+
+// enableCORS allows cross-site requests for a given handler.
+func enableCORS(handler func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("access-control-allow-origin", "*")
+		w.Header().Set("access-control-allow-method", "post")
+		w.Header().Set("access-control-allow-headers", "authorization, content-type")
+		w.Header().Set("access-control-max-age", "3600")
+		if r.Method == http.MethodOptions {
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+		handler(w, r)
+	}
+}