PictureAppService.cs
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using FoodLabeling.Application.Contracts.Dtos.Picture;
using FoodLabeling.Application.Contracts.IServices;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Hosting;
using Volo.Abp;
using Volo.Abp.Application.Services;
using Volo.Abp.Guids;
namespace FoodLabeling.Application.Services;
public class PictureAppService : ApplicationService, IPictureAppService
{
private const long MaxSizeBytes = 5 * 1024 * 1024;
private static readonly HashSet<string> AllowedExtensions = new(StringComparer.OrdinalIgnoreCase)
{
".jpg",
".jpeg",
".png",
".webp",
".gif"
};
private readonly IGuidGenerator _guidGenerator;
private readonly IHostEnvironment _hostEnvironment;
public PictureAppService(IGuidGenerator guidGenerator, IHostEnvironment hostEnvironment)
{
_guidGenerator = guidGenerator;
_hostEnvironment = hostEnvironment;
}
/// <summary>
/// 上传类别图片（保存到 /www/wwwroot/FoodLabelingManagementUs/picture）
/// </summary>
/// <remarks>返回的 Url 可直接保存到 CategoryPhotoUrl。</remarks>
[HttpPost]
[Consumes("multipart/form-data")]
[Route("/api/app/picture/category/upload")]
public async Task<PictureUploadOutputDto> UploadCategoryAsync([FromForm] PictureUploadInputVo input)
{
if (input.File is null || input.File.Length <= 0)
{
throw new UserFriendlyException("请选择要上传的图片文件");
}
if (input.File.Length > MaxSizeBytes)
{
throw new UserFriendlyException("图片大小不能超过5MB");
}
var ext = Path.GetExtension(input.File.FileName ?? string.Empty);
if (string.IsNullOrWhiteSpace(ext) || !AllowedExtensions.Contains(ext))
{
throw new UserFriendlyException("仅支持上传 jpg/jpeg/png/webp/gif 格式图片");
}
var subDir = NormalizeSubDir(input.SubDir);
var saveRoot = ResolvePictureRoot();
var saveDir = string.IsNullOrWhiteSpace(subDir) ? saveRoot : Path.Combine(saveRoot, subDir);
Directory.CreateDirectory(saveDir);
var fileName = $"{DateTime.Now:yyyyMMddHHmmss}_{_guidGenerator.Create():N}{ext.ToLowerInvariant()}";
var savePath = Path.Combine(saveDir, fileName);
await using (var stream = new FileStream(savePath, FileMode.CreateNew, FileAccess.Write, FileShare.None))
{
await input.File.CopyToAsync(stream);
}
var url = BuildPictureUrl(subDir, fileName);
return new PictureUploadOutputDto
{
Url = url,
FileName = fileName,
Size = input.File.Length
};
}
private string ResolvePictureRoot()
{
var linuxPictureRoot = "/www/wwwroot/FoodLabelingManagementUs/picture";
var webRootPicture = Path.Combine(_hostEnvironment.ContentRootPath, "wwwroot", "FoodLabelingManagementUs", "picture");
return Directory.Exists(linuxPictureRoot) ? linuxPictureRoot : webRootPicture;
}
private static string NormalizeSubDir(string? subDir)
{
if (string.IsNullOrWhiteSpace(subDir))
{
return string.Empty;
}
var s = subDir.Trim().Replace('\\', '/');
while (s.StartsWith('/'))
{
s = s[1..];
}
if (s.Contains("..", StringComparison.Ordinal))
{
throw new UserFriendlyException("subDir 不能包含 ..");
}
return s;
}
private static string BuildPictureUrl(string? subDir, string fileName)
{
var s = string.IsNullOrWhiteSpace(subDir) ? string.Empty : $"/{subDir.Trim().Replace('\\', '/').Trim('/')}";
return $"/picture{s}/{fileName}";
}
}