update: template可以接受网络文件

internal/util/base64.go

@@ -0,0 +1,23 @@
+package util
+
+import (
+	"encoding/base64"
+	"strings"
+)
+
+func DecodeBase64(s string) (string, error) {
+	s = strings.TrimSpace(s)
+	// url safe
+	if strings.Contains(s, "-") || strings.Contains(s, "_") {
+		s = strings.Replace(s, "-", "+", -1)
+		s = strings.Replace(s, "_", "/", -1)
+	}
+	if len(s)%4 != 0 {
+		s += strings.Repeat("=", 4-len(s)%4)
+	}
+	decodeStr, err := base64.StdEncoding.DecodeString(s)
+	if err != nil {
+		return "", err
+	}
+	return string(decodeStr), nil
+}

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
+}