139 lines
4.7 KiB
C#
139 lines
4.7 KiB
C#
using MiAssessment.Admin.Business.Models.Upload;
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using MiAssessment.Admin.Business.Services.Interfaces;
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using Microsoft.AspNetCore.Hosting;
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using Microsoft.Extensions.Logging;
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namespace MiAssessment.Admin.Business.Services.Storage;
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/// <summary>
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/// 本地存储提供者
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/// 将文件保存到 wwwroot/uploads/{yyyy}/{MM}/{dd}/ 目录
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/// </summary>
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public class LocalStorageProvider : IStorageProvider
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{
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private readonly IWebHostEnvironment _environment;
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private readonly ILogger<LocalStorageProvider> _logger;
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private const string UploadBasePath = "uploads";
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public LocalStorageProvider(
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IWebHostEnvironment environment,
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ILogger<LocalStorageProvider> logger)
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{
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_environment = environment;
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_logger = logger;
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}
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/// <inheritdoc />
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public string StorageType => "1";
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/// <inheritdoc />
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public bool SupportsDirectUpload => false;
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/// <inheritdoc />
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public async Task<UploadResult> UploadAsync(Stream fileStream, string fileName, string contentType)
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{
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try
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{
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// 生成日期目录路径: uploads/2026/01/19/
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var now = DateTime.Now;
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var datePath = Path.Combine(
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now.Year.ToString(),
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now.Month.ToString("D2"),
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now.Day.ToString("D2"));
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// 生成唯一文件名
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var uniqueFileName = GenerateUniqueFileName(fileName);
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// 构建完整的物理路径
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var relativePath = Path.Combine(UploadBasePath, datePath);
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var physicalPath = Path.Combine(_environment.WebRootPath, relativePath);
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// 确保目录存在
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EnsureDirectoryExists(physicalPath);
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// 完整文件路径
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var fullFilePath = Path.Combine(physicalPath, uniqueFileName);
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// 保存文件
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await using var fileStreamOutput = new FileStream(fullFilePath, FileMode.Create, FileAccess.Write);
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await fileStream.CopyToAsync(fileStreamOutput);
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// 生成相对URL路径 (使用正斜杠)
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var url = $"/{UploadBasePath}/{datePath.Replace(Path.DirectorySeparatorChar, '/')}/{uniqueFileName}";
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_logger.LogInformation("本地存储上传成功: {FileName} -> {Url}", fileName, url);
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return UploadResult.Ok(url);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "本地存储上传失败: {FileName}", fileName);
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return UploadResult.Fail($"保存文件失败: {ex.Message}");
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}
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}
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/// <inheritdoc />
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public Task<bool> DeleteAsync(string fileUrl)
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{
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try
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{
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if (string.IsNullOrWhiteSpace(fileUrl))
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{
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return Task.FromResult(false);
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}
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// 将URL转换为物理路径
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// URL格式: /uploads/2026/01/19/xxx.jpg
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var relativePath = fileUrl.TrimStart('/').Replace('/', Path.DirectorySeparatorChar);
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var physicalPath = Path.Combine(_environment.WebRootPath, relativePath);
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if (File.Exists(physicalPath))
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{
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File.Delete(physicalPath);
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_logger.LogInformation("本地存储删除成功: {Url}", fileUrl);
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return Task.FromResult(true);
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}
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_logger.LogWarning("本地存储删除失败，文件不存在: {Url}", fileUrl);
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return Task.FromResult(false);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "本地存储删除失败: {Url}", fileUrl);
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return Task.FromResult(false);
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}
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}
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/// <inheritdoc />
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public Task<PresignedUrlResponse?> GetPresignedUploadUrlAsync(string fileName, string contentType, int expiresInSeconds = 600)
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{
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// 本地存储不支持客户端直传，返回null
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_logger.LogDebug("本地存储不支持客户端直传");
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return Task.FromResult<PresignedUrlResponse?>(null);
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}
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/// <summary>
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/// 生成唯一文件名
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/// 格式: {timestamp}_{guid}{extension}
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/// </summary>
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private static string GenerateUniqueFileName(string originalFileName)
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{
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var extension = Path.GetExtension(originalFileName).ToLowerInvariant();
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var timestamp = DateTime.Now.ToString("yyyyMMddHHmmssfff");
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var guid = Guid.NewGuid().ToString("N")[..8]; // 取GUID前8位
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return $"{timestamp}_{guid}{extension}";
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}
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/// <summary>
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/// 确保目录存在，不存在则创建
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/// </summary>
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private void EnsureDirectoryExists(string path)
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{
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if (!Directory.Exists(path))
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{
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Directory.CreateDirectory(path);
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_logger.LogDebug("创建目录: {Path}", path);
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}
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}
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}
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