add JSON helper to HTTP utils

http-utils.go

@@ -0,0 +1,47 @@
+package proxmoxaas_common_lib
+
+import (
+	"bytes"
+	"encoding/json"
+	"html/template"
+	"net/http"
+)
+
+func HTTPExecuteHTMLTemplate(w http.ResponseWriter, t *template.Template, name string, d any) {
+	w.Header().Set("Content-Type", "text/html")
+	body := bytes.Buffer{}
+	err := t.ExecuteTemplate(&body, name, d)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	} else {
+		w.Write(body.Bytes())
+		return
+	}
+}
+
+func HTTPExecuteHTMLFragmentTemplate(w http.ResponseWriter, t *template.Template, name string, d any) {
+	w.Header().Set("Content-Type", "text/plain")
+	body := bytes.Buffer{}
+	err := t.ExecuteTemplate(&body, name, d)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	} else {
+		w.Write(body.Bytes())
+		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
+	}
+}