Add helper

bridge/helper/helper.go

@@ -0,0 +1,28 @@
+package helper
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+	"time"
+)
+
+func DownloadFile(url string) (*[]byte, error) {
+	var buf bytes.Buffer
+	client := &http.Client{
+		Timeout: time.Second * 5,
+	}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		resp.Body.Close()
+		return nil, err
+	}
+	io.Copy(&buf, resp.Body)
+	data := buf.Bytes()
+	resp.Body.Close()
+	return &data, nil
+}