added download certificate and key in zip format

utils/AddFileToZipWithName.go

@@ -0,0 +1,21 @@
+package utils
+
+import (
+	"archive/zip"
+	"os"
+)
+
+func AddFileToZipWithName(zipWriter *zip.Writer, filePath, fileName string) error {
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return err
+	}
+
+	f, err := zipWriter.Create(fileName)
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Write(data)
+	return err
+}

utils/CreateDomainZip.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"archive/zip"
+	"bytes"
+)
+
+func CreateDomainZip(certPath, keyPath, domain string) (*bytes.Buffer, error) {
+	buf := new(bytes.Buffer)
+	zipWriter := zip.NewWriter(buf)
+	defer zipWriter.Close()
+
+	// Добавляем сертификат
+	err := AddFileToZipWithName(zipWriter, certPath, domain+".crt")
+	if err != nil {
+		return nil, err
+	}
+
+	// Добавляем ключ
+	err = AddFileToZipWithName(zipWriter, keyPath, domain+".key")
+	if err != nil {
+		return nil, err
+	}
+
+	return buf, nil
+}