FileStorageService.cs
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using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Logging;
using Rcs.Application.Services;
namespace Rcs.Infrastructure.Services
{
/// <summary>
/// 文件存储服务实现
/// </summary>
public class FileStorageService : IFileStorageService
{
private readonly ILogger<FileStorageService> _logger;
private readonly string _rootPath;
public FileStorageService(ILogger<FileStorageService> logger, IWebHostEnvironment environment)
{
_logger = logger;
// 使用项目内容根目录，确保 Debug 和 Release 模式下都指向项目文件夹
_rootPath = Path.Combine(environment.ContentRootPath, "uploads");
// 确保根目录存在
if (!Directory.Exists(_rootPath))
{
Directory.CreateDirectory(_rootPath);
}
_logger.LogInformation("文件存储根路径: {RootPath}", _rootPath);
}
public async Task<FileStorageResult> SaveFileAsync(Stream stream, string fileName, string? subDirectory = null, CancellationToken cancellationToken = default)
{
if (stream == null || stream.Length == 0)
{
throw new ArgumentException("文件流不能为空");
}
if (string.IsNullOrWhiteSpace(fileName))
{
throw new ArgumentException("文件名不能为空");
}
try
{
// 生成唯一文件名
var extension = Path.GetExtension(fileName);
var uniqueFileName = $"{Guid.NewGuid()}{extension}";
// 构建保存路径
var savePath = _rootPath;
if (!string.IsNullOrWhiteSpace(subDirectory))
{
savePath = Path.Combine(_rootPath, subDirectory);
if (!Directory.Exists(savePath))
{
Directory.CreateDirectory(savePath);
}
}
var fullPath = Path.Combine(savePath, uniqueFileName);
var relativePath = string.IsNullOrWhiteSpace(subDirectory)
? uniqueFileName
: Path.Combine(subDirectory, uniqueFileName).Replace("\\", "/"); // 统一使用 URL 路径分隔符
// 保存文件
using (var fileStream = new FileStream(fullPath, FileMode.Create))
{
stream.Position = 0; // 确保从头开始读取
await stream.CopyToAsync(fileStream, cancellationToken);
}
_logger.LogInformation("文件保存成功: {FilePath}", fullPath);
return new FileStorageResult
{
FileName = uniqueFileName,
OriginalFileName = fileName,
RelativePath = relativePath,
FullPath = fullPath,
FileSize = stream.Length,
Extension = extension
};
}
catch (Exception ex)
{
_logger.LogError(ex, "保存文件失败: {FileName}", fileName);
throw;
}
}
public Task<bool> DeleteFileAsync(string filePath, CancellationToken cancellationToken = default)
{
try
{
var fullPath = Path.IsPathRooted(filePath)
? filePath
: Path.Combine(_rootPath, filePath);
if (File.Exists(fullPath))
{
File.Delete(fullPath);
_logger.LogInformation("文件删除成功: {FilePath}", fullPath);
return Task.FromResult(true);
}
_logger.LogWarning("文件不存在: {FilePath}", fullPath);
return Task.FromResult(false);
}
catch (Exception ex)
{
_logger.LogError(ex, "删除文件失败: {FilePath}", filePath);
return Task.FromResult(false);
}
}
public string GetFullPath(string relativePath)
{
return Path.Combine(_rootPath, relativePath);
}
public (bool IsValid, string ErrorMessage) ValidateFile(string fileName, long fileSize, string[]? allowedExtensions = null, long? maxSizeInBytes = null)
{
if (string.IsNullOrWhiteSpace(fileName))
{
return (false, "文件名不能为空");
}
if (fileSize <= 0)
{
return (false, "文件不能为空");
}
// 验证文件大小
if (maxSizeInBytes.HasValue && fileSize > maxSizeInBytes.Value)
{
var maxSizeMB = maxSizeInBytes.Value / 1024.0 / 1024.0;
return (false, $"文件大小超过限制（最大 {maxSizeMB:F2} MB）");
}
// 验证文件扩展名
if (allowedExtensions != null && allowedExtensions.Length > 0)
{
var extension = Path.GetExtension(fileName).ToLowerInvariant();
if (!allowedExtensions.Contains(extension))
{
return (false, $"不支持的文件类型，允许的类型: {string.Join(", ", allowedExtensions)}");
}
}
return (true, string.Empty);
}
}
}