Create utils/base64.go

internal/utils/base64.go

@@ -0,0 +1,10 @@
+package utils
+
+import (
+	"encoding/base64"
+)
+
+// Base64Decode 解码base64字符串为字节数组
+func Base64Decode(data string) ([]byte, error) {
+	return base64.StdEncoding.DecodeString(data)
+}