Add: upload controller in slave mode

pkg/serializer/file.go

@@ -1,10 +1,33 @@
 package serializer
 
+import (
+	"encoding/base64"
+	"encoding/json"
+)
+
 // UploadPolicy slave模式下传递的上传策略
 type UploadPolicy struct {
 	SavePath         string   `json:"save_path"`
-	MaxSize          uint64   `json:"save_path"`
+	MaxSize          uint64   `json:"max_size"`
 	AllowedExtension []string `json:"allowed_extension"`
 	CallbackURL      string   `json:"callback_url"`
 	CallbackKey      string   `json:"callback_key"`
 }
+
+// DecodeUploadPolicy 反序列化Header中携带的上传策略
+// TODO 测试
+func DecodeUploadPolicy(raw string) (*UploadPolicy, error) {
+	var res UploadPolicy
+
+	rawJSON, err := base64.StdEncoding.DecodeString(raw)
+	if err != nil {
+		return nil, err
+	}
+
+	err = json.Unmarshal(rawJSON, &res)
+	if err != nil {
+		return nil, err
+	}
+
+	return &res, err
+}