add JSON helper to HTTP utils

http-utils.go

@@ -2,6 +2,7 @@ package proxmoxaas_common_lib
 
 import (
 	"bytes"
+	"encoding/json"
 	"html/template"
 	"net/http"
 )
@@ -31,3 +32,16 @@ func HTTPExecuteHTMLFragmentTemplate(w http.ResponseWriter, t *template.Template
 		return
 	}
 }
+
+func HTTPWriteJson(w http.ResponseWriter, code int, obj any) {
+	w.Header().Set("Content-Type", "application/json")
+	json, err := json.Marshal(obj)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	} else {
+		w.WriteHeader(code)
+		w.Write(json)
+		return
+	}
+}