public virtual async Task ValidationAsync(UploadOssObjectInput input)
{
var validation = await GetByCacheItemAsync();
if (validation.SizeLimit * 1024 * 1024 < input.TotalSize)
{
throw new UserFriendlyException(_stringLocalizer["UploadFileSizeBeyondLimit", validation.SizeLimit]);
}
var fileExtensionName = FileHelper.GetExtension(input.FileName);
if (!validation.AllowedExtensions
.Any(fe => fe.Equals(fileExtensionName, StringComparison.CurrentCultureIgnoreCase)))
{
throw new UserFriendlyException(_stringLocalizer["NotAllowedFileExtensionName", fileExtensionName]);
}
}
public virtual async Task UploadAsync([FromForm] UploadOssObjectInput input)
{
await FileValidater.ValidationAsync(input);
// 以上传的文件名创建一个临时目录
var tempFilePath = Path.Combine(
Path.GetTempPath(),
"lingyun-abp-application",
"upload-tmp",
string.Concat(input.Path ?? "", input.FileName).ToMd5());
DirectoryHelper.CreateIfNotExists(tempFilePath);
// 以上传的分片索引创建临时文件
var tempSavedFile = Path.Combine(tempFilePath, $"{input.ChunkNumber}.uploadtmp");
try
{
if (HttpContext.RequestAborted.IsCancellationRequested)
{
// 如果取消请求,删除临时目录
Directory.Delete(tempFilePath, true);
return;
}
if (input.File != null)
{
// 保存临时文件
using (var fs = new FileStream(tempSavedFile, FileMode.Create, FileAccess.Write))
{
// 写入当前分片文件
await input.File.CopyToAsync(fs);
}
}
if (input.ChunkNumber == input.TotalChunks)
{
var createOssObjectInput = new CreateOssObjectInput
{
Bucket = input.Bucket,
Path = input.Path,
Object = input.FileName
};
// 合并文件
var mergeSavedFile = Path.Combine(tempFilePath, $"{input.FileName}");
// 获取并排序所有分片文件
var mergeFiles = Directory.GetFiles(tempFilePath).OrderBy(f => f.Length).ThenBy(f => f);
// 创建临时合并文件
using (var memoryStream = new MemoryStream())
{
foreach (var mergeFile in mergeFiles)
{
// 读取当前文件字节
var mergeFileBytes = await FileHelper.ReadAllBytesAsync(mergeFile);
// 写入到合并文件流
await memoryStream.WriteAsync(mergeFileBytes, HttpContext.RequestAborted);
Array.Clear(mergeFileBytes, 0, mergeFileBytes.Length);
// 删除已参与合并的临时文件分片
FileHelper.DeleteIfExists(mergeFile);
}
createOssObjectInput.SetContent(memoryStream);
await OssObjectAppService.CreateAsync(createOssObjectInput);
// 文件保存之后删除临时文件目录
Directory.Delete(tempFilePath, true);
}
}
}
catch
{
// 发生异常删除临时文件目录
Directory.Delete(tempFilePath, true);
throw;
}
}