Initial backend import

internal/handlers/util.go

@@ -0,0 +1,32 @@
+package handlers
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"strconv"
+)
+
+func writeJSON(w http.ResponseWriter, v any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	enc := json.NewEncoder(w)
+	enc.SetEscapeHTML(false)
+	_ = enc.Encode(v)
+}
+
+func atoiDef(s string, def int) int {
+	if s == "" {
+		return def
+	}
+	n, err := strconv.Atoi(s)
+	if err != nil || n < 1 {
+		return def
+	}
+	return n
+}
+
+func jsonDecode(r *http.Request, v any) error {
+	defer r.Body.Close()
+	dec := json.NewDecoder(io.LimitReader(r.Body, 1<<20))
+	return dec.Decode(v)
+}