/// <summary>生成新文档，如已存在则直接返回已存在文档 wang加</summary>
private async Task <SysFile> BuildNewCheckExists(ServerUploadRequest request, UploadResult result)
{
var doc = BuildNew(request);
var uploadMD5 = request.Md5;
doc.Md5 = BuildMD5(request.ServerFile, uploadMD5);
doc.Size = new FileInfo(request.ServerFile).Length;
var existsDoc = await _fileMan.GetByMd5Async(doc.Md5);
if (existsDoc == null)
{
var docFile = _uploadPath + doc.RelativePath;
File.Move(request.ServerFile, docFile);
}
else //服务端去重， wang加
{
var docFile = _uploadPath + existsDoc.RelativePath;
if (!File.Exists(docFile)) //万一找到的旧文件不存在，就复制新传的文件
{
docFile = _uploadPath + doc.RelativePath;
File.Move(request.ServerFile, docFile);
await this._fileMan.UpdateManyAsync(new { doc.RelativePath, existsDoc.Md5 });
}
else //如果相同的文件已存在，则新增一条指向原有文件的记录
{
doc.RelativePath = existsDoc.RelativePath;
}
result.Dup = true;
}
await _fileMan.InsertAsync(doc);
return(doc);
}
/// <summary>秒传,需要客户端提供文件的MD5</summary>
private async Task <UploadResult> HandleClientMD5Async(ServerUploadRequest request)
{
UploadResult result = new UploadResult();
if (request.Md5.IsEmpty())
{
return(result);
}
var existsDoc = await _fileMan.GetByMd5Async(request.Md5);
if (existsDoc != null)
{
var docFile = _uploadPath + existsDoc.RelativePath;
if (File.Exists(docFile))
{
//如果相同的文件已存在，则新增一条指向原有文件的记录
existsDoc.Id = null;
existsDoc.Name = request.FileName;
existsDoc.Path = request.FilePath;
await _fileMan.InsertAsync(existsDoc);
result.Id = existsDoc.Id;
}
result.Dup = true;
}
return(result);
}
/// <summary>处理单文件上传</summary>
private async Task <UploadResult> HandleSingleAsync(ServerUploadRequest request)
{
UploadResult result = new UploadResult();
var doc = await BuildNewCheckExists(request, result);
result.Id = doc.Id;
return(result);
}
/// <summary>处理分片文件上传</summary>
private async Task <UploadResult> HandleChunkAsync(ServerUploadRequest request)
{
UploadResult result = new UploadResult();
if (request.Chunk < 0 || request.Chunks < 1 || request.Chunk > request.Chunks)
{
throw new Exception("分片参数无效！");
}
var uploadMD5 = request.Md5;
result.Chunk = request.Chunk;
if (request.Chunk < request.Chunks)
{
if (request.ServerFile.IsEmpty())
{
throw new Exception("分片上传时流不存在！");
}
var chunkFile = GetNewChunkFile(request, request.Chunk);
if (File.Exists(chunkFile))
{
File.Delete(chunkFile);
}
File.Move(request.ServerFile, chunkFile);
}
else
{
#region 合并分片文件
var mergeFile = GetNewMergeFile(request);
List <string> chunkFiles = new List <string>();
using (var mergeStream = new FileStream(mergeFile, FileMode.Create, FileAccess.Write))
{
for (var i = 0; i < request.Chunks; i++)
{
var chunkFile = GetNewChunkFile(request, i);
using (var chunkStream = new FileStream(chunkFile, FileMode.Open, FileAccess.Read))
{
await chunkStream.CopyToAsync(mergeStream);
}
chunkFiles.Add(chunkFile);
}
}
request.ServerFile = mergeFile;
var doc = await BuildNewCheckExists(request, result);
result.Md5 = doc.Md5;
result.Id = doc.Id;
chunkFiles.ForEach(File.Delete);
#endregion
}
return(result);
}
/// <summary>处理文件上传</summary>
public async Task <UploadResult> UploadAsync(ServerUploadRequest request)
{
UploadResult result = null;
if (!request.Md5.IsEmpty())
{
result = await HandleClientMD5Async(request);
if (!result.Id.IsEmpty())
{
return(result);
}
}
if (request.Guid.IsEmpty())
{
result = await HandleSingleAsync(request);
}
else
{
result = await HandleChunkAsync(request);
}
return(result);
}
private SysFile BuildNew(ServerUploadRequest request)
{
var doc = new SysFile
{
Name = request.FileName,
CreateTime = DateTime.Now,
UserId = request.UserId
};
var ext = Path.GetExtension(request.FileName);
var level1Dir = doc.CreateTime.ToString("yyyyMM");
var level2Dir = doc.CreateTime.ToString("ddHH");
var docPath = $@"{this._uploadPath}\{level1Dir}\{level2Dir}";
if (!Directory.Exists(docPath))
{
Directory.CreateDirectory(docPath);
}
doc.RelativePath = $@"\{level1Dir}\{level2Dir}\{Guid.NewGuid().ToString("N")}{ext}";
doc.ContentType = IOHelper.GetContentType(request.FileName);
return(doc);
}
/// <summary>获得分片合并文件路径</summary>
private string GetNewMergeFile(ServerUploadRequest request)
{
var ext = Path.GetExtension(request.FileName);
return($@"{this.TempPath}\{request.Guid}{ext}");
}
/// <summary>获得新分片文件路径</summary>
private string GetNewChunkFile(ServerUploadRequest request, int chunk)
{
var ext = Path.GetExtension(request.FileName);
return($@"{this.TempPath}\{request.Guid}_PART_{chunk.ToString()}{ext}");
}