public IActionResult UploadFormFile(IFormFile file)
{
if (file == null)
{
throw new HttpBadRequestException("请将Content-Type设置application/x-www-form-urlencoded,然后在formData的file附上图标文件");
}
string iconExt = "";
Microsoft.Extensions.Primitives.StringValues headerVar;
Request.Headers.TryGetValue("fileExt", out headerVar); if (headerVar.Count > 0)
{
iconExt = headerVar[0].Trim();
}
if (string.IsNullOrWhiteSpace(iconExt))
{
throw new HttpBadRequestException("请在Headers上添加fileExt标识icon的扩展名");
}
iconExt = iconExt.Replace(".", string.Empty);
//先把文件保存到临时文件夹,计算md5
var tmpPath = Path.Combine(tmpFileFolder, $"{Guid.NewGuid()}.{iconExt}");
using (FileStream fs = System.IO.File.Create(tmpPath))
{
file.CopyTo(fs);
// 清空缓冲区数据
fs.Flush();
}
var md5 = MD5Gen.CalcFile(tmpPath);
var fileName = $"{md5}.{iconExt}";
var iconPath = Path.Combine(iconFolder, fileName);
//如果文件不存在资源文件夹,拷贝存储
if (!System.IO.File.Exists(iconPath))
{
System.IO.File.Copy(tmpPath, iconPath);
}
//为文件生成缩略图标
ImageThumbnailCreator.SaveImageThumbnails(iconPath);
//删除临时文件
if (System.IO.File.Exists(tmpPath))
{
System.IO.File.Delete(tmpPath);
}
return(Ok($"/{OSSConst.AppRouteArea}/{OSSConst.IconFolder}/{fileName}"));
}
/// <summary>
/// 真实保存上传文件过程
/// </summary>
/// <param name="saveFile"></param>
/// <param name="owner"></param>
/// <returns></returns>
private async Task <IActionResult> SaveUpload(Action <string> saveFile, Account owner)
{
string fileState = "";
string fileExt = "";
string localPath = "";
string description = "";
Microsoft.Extensions.Primitives.StringValues headerVar;
Request.Headers.TryGetValue("fileState", out headerVar); if (headerVar.Count > 0)
{
fileState = headerVar[0].Trim();
}
Request.Headers.TryGetValue("fileExt", out headerVar); if (headerVar.Count > 0)
{
fileExt = headerVar[0].Trim();
}
Request.Headers.TryGetValue("localPath", out headerVar); if (headerVar.Count > 0)
{
localPath = headerVar[0].Trim();
}
Request.Headers.TryGetValue("description", out headerVar); if (headerVar.Count > 0)
{
description = headerVar[0].Trim();
}
//几个头信息decode
if (!string.IsNullOrWhiteSpace(fileState))
{
fileState = System.Web.HttpUtility.UrlDecode(fileState);
}
if (!string.IsNullOrWhiteSpace(fileExt))
{
fileExt = System.Web.HttpUtility.UrlDecode(fileExt);
}
if (!string.IsNullOrWhiteSpace(localPath))
{
localPath = System.Web.HttpUtility.UrlDecode(localPath);
}
if (!string.IsNullOrWhiteSpace(description))
{
description = System.Web.HttpUtility.UrlDecode(description);
}
//确保扩展名以 .开头，比如.jpg
if (fileExt.Length > 0 && fileExt[0] != '.')
{
fileExt = "." + fileExt;
}
FileAsset res = new FileAsset();
res.Id = GuidGen.NewGUID(); //先生成临时ID，用于保存文件
res.Name = localPath.Length > 0 ? Path.GetFileName(localPath) : res.Id;
res.Url = "/upload/" + res.Id;
int fstate = 0;
res.FileState = int.TryParse(fileState, out fstate) ? fstate : 0;
res.FileExt = fileExt;
res.LocalPath = localPath;
res.Description = description;
res.Creator = owner.Id;
res.Modifier = owner.Id;
res.OrganizationId = owner.OrganizationId;
//保存
string savePath = Path.Combine(uploadPath, res.Id);
try
{
saveFile(savePath);
}
catch
{
res.Id = "";
res.Url = "";
return(Ok(res));
}
FileInfo fi = new FileInfo(savePath);
res.Size = fi.Length;
res.Md5 = Md5.CalcFile(savePath); //计算md5
res.Id = res.Md5; //将ID和url改为md5
res.Url = "/upload/" + res.Id + res.FileExt;
string renamedPath = Path.Combine(uploadPath, res.Id + res.FileExt);
//图片文件生成缩略图
var createThumbnails = new Action(() =>
{
if (res.FileExt.Equals(".jpg", StringComparison.CurrentCultureIgnoreCase) || res.FileExt.Equals(".png", StringComparison.CurrentCultureIgnoreCase) ||
res.FileExt.Equals(".jpeg", StringComparison.CurrentCultureIgnoreCase) || res.FileExt.Equals(".gif", StringComparison.CurrentCultureIgnoreCase) ||
res.FileExt.Equals(".bmp", StringComparison.CurrentCultureIgnoreCase)
)
{
ImageThumbnailCreator.SaveImageThumbnails(renamedPath);
}
});
// 检查是否已经上传过此文件
var existRecord = await _Repository._DbContext.Set <FileAsset>().FindAsync(res.Id);
if (existRecord != null)
{
// 数据库记录还在，但是文件不在了，重新保存下文件。
if (System.IO.File.Exists(renamedPath) == false)
{
//重命名文件
System.IO.File.Move(savePath, renamedPath);
createThumbnails();
}
else
{
//删除冗余文件
System.IO.File.Delete(savePath);
}
return(Ok(existRecord));
}
else // 没有上传记录
{
//没上传记录，但是已经有这个文件了，先删除已有的文件，使用用户的文件覆盖
if (System.IO.File.Exists(renamedPath))
{
System.IO.File.Delete(renamedPath);
}
System.IO.File.Move(savePath, renamedPath); //重命名文件
createThumbnails();
}
await _Repository.CreateAsync(owner.Id, res); //记录到数据库
return(Ok(res));
}