update: template可以接受网络文件

internal/util/base64.go

@@ -1,4 +1,4 @@
-package internal
+package util
 
 import (
 	"encoding/base64"

internal/util/fetch.go

@@ -0,0 +1,25 @@
+package util
+
+import (
+	"io"
+	"net/http"
+)
+
+func Fetch(url string, maxRetryTimes int) (string, error) {
+	retryTime := 0
+	var err error
+	for retryTime < maxRetryTimes {
+		resp, err := http.Get(url)
+		if err != nil {
+			retryTime++
+			continue
+		}
+		data, err := io.ReadAll(resp.Body)
+		if err != nil {
+			retryTime++
+			continue
+		}
+		return string(data), err
+	}
+	return "", err
+}