调整分块文件大小限制

src/main/java/com/backendsys/modules/sdk/douyincloud/tos/service/impl/DouyinTosServiceImpl.java

@@ -229,6 +229,7 @@ public class DouyinTosServiceImpl implements DouyinTosService {
 
     /**
      * [抖音云TOS] 上传分块
+     * - 抖音云的单块上传大小不能小于 4MB（最后一块可忽略）
      */
     @Override
     public UploadPartV2Output uploadPart(MultipartFile multipartFile, String upload_id, String object_key, Integer partNumber) {

src/main/java/com/backendsys/modules/upload/service/impl/SysFileMultipartServiceImpl.java

@@ -140,6 +140,7 @@ public class SysFileMultipartServiceImpl implements SysFileMultipartService {
     }
 
     // 2.上传分块
+    // - 抖音云单个分块大小不能小于4MB
     @Override
     public Map<String, Object> multipartUpload(MultipartFile multipartFile, String upload_id, Integer upload_chunk_index) {
 
@@ -147,7 +148,6 @@ public class SysFileMultipartServiceImpl implements SysFileMultipartService {
         if (StrUtil.isEmpty(upload_id)) throw new CustException("upload_id 不能为空");
         if (upload_chunk_index == null) throw new CustException("upload_chunk_index 不能为空");
 
-
         // [Get] 获得初始化分块信息
         SysFile sysFileEntity = sysFileDao.selectOne(new LambdaQueryWrapper<SysFile>().eq(SysFile::getUpload_id, upload_id));
         if (sysFileEntity == null) throw new CustException("分块记录不存在");
@@ -155,6 +155,13 @@ public class SysFileMultipartServiceImpl implements SysFileMultipartService {
         Integer upload_chunk_size = sysFileEntity.getUpload_chunk_count();
         if (upload_chunk_index > upload_chunk_size) throw new CustException("分块索引(index)不能大于分块数量(count)");
 
+        if (upload_chunk_index < upload_chunk_size) {
+            // 分片编号从 1 开始，最大为 10000。除最后一个分片以外，其他分片大小最小为 4MiB
+            if (multipartFile.getSize() < 4 * 1024 * 1024) {
+                throw new CustException("分块文件大小不能小于 4MB");
+            }
+        }
+
         // 获得公共配置
         List<SysCommon> sysCommonList = sysCommonService.getCommonByCategory("UPLOAD");
         AtomicReference<Integer> UPLOAD_TARGET = new AtomicReference<>();