using Microsoft.AspNetCore.Authorization;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.Mvc;
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using System.Text;
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using WIDESEAWCS_Core;
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using WIDESEAWCS_ISystemServices;
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using WIDESEAWCS_Model.Models;
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namespace WIDESEAWMSServer.Controllers
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{
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[Route("api/Sys_Log")]
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[ApiController]
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public class Sys_LogController : ApiBaseController<ISys_LogService, Sys_Log>
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{
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private const int MAX_FILE_SIZE_MB = 50;
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private const int MAX_RETRY_COUNT = 3;
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private const int RETRY_DELAY_MS = 100;
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private static readonly string[] ALLOWED_FILE_TYPES = { ".txt", ".log", ".csv", ".json", ".xml" };
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private readonly IHttpContextAccessor _httpContextAccessor;
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public Sys_LogController(ISys_LogService service, IHttpContextAccessor httpContextAccessor) : base(service)
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{
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_httpContextAccessor = httpContextAccessor;
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}
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[HttpPost, Route("GetLogList"), AllowAnonymous]
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public WebResponseContent GetLogList()
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{
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return Service.GetLogList();
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}
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[HttpPost, Route("GetLogData"), AllowAnonymous]
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public WebResponseContent GetLogData([FromBody] GetLogParm parm)
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{
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return Service.GetLogData(parm);
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}
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[HttpPost, Route("GetLogName"), AllowAnonymous]
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public WebResponseContent GetLogName()
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{
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return Service.GetLogName();
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}
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[HttpPost, Route("GetLog"), AllowAnonymous]
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public WebResponseContent GetLog(string fileName)
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{
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return Service.GetLog(fileName);
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}
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[HttpPost, HttpGet, Route("DownLoadLog"), AllowAnonymous]
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public virtual async Task<ActionResult> DownLoadLog(string fileName)
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{
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try
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{
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// 1. 参数验证
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if (string.IsNullOrWhiteSpace(fileName))
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{
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return BadRequest("文件名不能为空");
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}
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// 安全性检查：防止路径遍历攻击
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if (fileName.Contains("..") || Path.IsPathRooted(fileName))
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{
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return BadRequest("无效的文件名");
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}
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//string logDirectory = Path.Combine(AppContext.BaseDirectory, "logs");
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string logDirectory = Path.Combine(AppContext.BaseDirectory);
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if (!Directory.Exists(logDirectory))
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{
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Directory.CreateDirectory(logDirectory);
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}
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string filePath = Path.Combine(logDirectory, fileName);
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if (Directory.Exists(filePath))
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{
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return NotFound($"文件 {fileName} 不存在");
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}
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string extension = Path.GetExtension(fileName).ToLowerInvariant();
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if (!IsAllowedFileType(extension))
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{
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return BadRequest($"不支持的文件类型: {extension}");
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}
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FileInfo fileInfo = new FileInfo(filePath);
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if (fileInfo.Length > MAX_FILE_SIZE_MB * 1024 * 1024)
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{
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return BadRequest($"文件过大，超过{MAX_FILE_SIZE_MB}MB限制");
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}
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// 方案1：使用重试机制 + 共享读取（推荐）
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byte[] fileBytes = await ReadFileWithRetryAsync(filePath);
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if (fileBytes == null)
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{
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return StatusCode(500, "文件被占用，无法下载，请稍后重试");
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}
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string contentType = GetContentType(extension);
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// 设置下载头
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Response.Headers.Add("Content-Disposition", $"attachment; filename=\"{System.Web.HttpUtility.UrlEncode(fileName, Encoding.UTF8)}\"");
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Response.Headers.Add("Cache-Control", "no-cache, no-store, must-revalidate");
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Response.Headers.Add("Pragma", "no-cache");
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Response.Headers.Add("Expires", "0");
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return File(fileBytes, contentType, fileName);
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}
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catch (UnauthorizedAccessException)
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{
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return StatusCode(403, "没有访问该文件的权限");
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}
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catch (PathTooLongException)
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{
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return BadRequest("文件路径过长");
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}
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catch (IOException ex)
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{
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if (IsFileLockedException(ex))
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{
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return StatusCode(500, "文件被锁定，可能正在被系统写入，请稍后再试");
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}
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return StatusCode(500, $"文件读取失败: {ex.Message}");
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}
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catch (Exception ex)
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{
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// 记录异常日志（这里简化为返回，实际项目中应该记录到日志系统）
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return StatusCode(500, $"服务器内部错误: {ex.Message}");
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}
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}
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/// <summary>
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/// 带重试机制的文件读取方法
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/// </summary>
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private async Task<byte[]> ReadFileWithRetryAsync(string filePath)
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{
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for (int attempt = 0; attempt < MAX_RETRY_COUNT; attempt++)
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{
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try
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{
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// 使用 FileShare.ReadWrite 允许其他进程同时读取和写入
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// 使用异步读取提高性能
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using (var fileStream = new FileStream(
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filePath,
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FileMode.Open,
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FileAccess.Read,
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FileShare.ReadWrite | FileShare.Delete, // 允许删除操作
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bufferSize: 4096,
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useAsync: true))
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{
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using (var memoryStream = new MemoryStream())
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{
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await fileStream.CopyToAsync(memoryStream);
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return memoryStream.ToArray();
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}
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}
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}
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catch (IOException) when (attempt < MAX_RETRY_COUNT - 1)
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{
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// 如果不是最后一次重试，等待一段时间
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await Task.Delay(RETRY_DELAY_MS * (attempt + 1));
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}
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catch (IOException ex)
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{
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// 最后一次尝试也失败了
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throw;
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}
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}
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return null;
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}
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/// <summary>
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/// 判断是否为文件被锁定的异常
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/// </summary>
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private bool IsFileLockedException(IOException ex)
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{
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int errorCode = ex.HResult & 0xFFFF;
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return errorCode == 32 || errorCode == 33; // ERROR_SHARING_VIOLATION or ERROR_LOCK_VIOLATION
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}
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/// <summary>
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/// 检查文件类型是否允许
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/// </summary>
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private bool IsAllowedFileType(string extension)
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{
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return ALLOWED_FILE_TYPES.Contains(extension);
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}
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/// <summary>
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/// 获取Content-Type
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/// </summary>
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private string GetContentType(string extension)
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{
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return extension.ToLowerInvariant() switch
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{
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".txt" => "text/plain; charset=utf-8",
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".log" => "text/plain; charset=utf-8",
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".csv" => "text/csv; charset=utf-8",
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".json" => "application/json; charset=utf-8",
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".xml" => "application/xml; charset=utf-8",
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_ => "application/octet-stream"
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};
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}
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/// <summary>
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/// 备选方案：创建临时副本下载（最安全，但性能稍差）
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/// </summary>
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[HttpPost, HttpGet, Route("DownLoadLogCopy"), AllowAnonymous]
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public virtual async Task<ActionResult> DownLoadLogCopy(string fileName)
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{
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try
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{
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// 参数验证（同上）
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if (string.IsNullOrWhiteSpace(fileName))
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{
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return BadRequest("文件名不能为空");
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}
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string logDirectory = Path.Combine(AppContext.BaseDirectory, "logs");
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string filePath = Path.Combine(logDirectory, fileName);
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if (Directory.Exists(filePath))
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{
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return NotFound($"文件 {fileName} 不存在");
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}
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// 生成临时文件名
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string tempFileName = $"{Path.GetFileNameWithoutExtension(fileName)}_{Guid.NewGuid():N}{Path.GetExtension(fileName)}";
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string tempFilePath = Path.Combine(Path.GetTempPath(), tempFileName);
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try
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{
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// 尝试复制文件到临时位置（使用重试机制）
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bool copySuccess = false;
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for (int attempt = 0; attempt < MAX_RETRY_COUNT; attempt++)
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{
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try
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{
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//Directory.GetFiles.Copy(filePath, tempFilePath, false);
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copySuccess = true;
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break;
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}
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catch (IOException) when (attempt < MAX_RETRY_COUNT - 1)
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{
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await Task.Delay(RETRY_DELAY_MS * (attempt + 1));
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}
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}
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if (!copySuccess)
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{
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return StatusCode(500, "无法复制文件，可能被其他进程占用");
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}
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// 从临时文件读取
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byte[] fileBytes;
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using (FileStream tempStream = new FileStream(tempFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
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{
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using (MemoryStream memoryStream = new MemoryStream())
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{
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await tempStream.CopyToAsync(memoryStream);
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fileBytes = memoryStream.ToArray();
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}
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}
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string extension = Path.GetExtension(fileName).ToLowerInvariant();
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string contentType = GetContentType(extension);
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// 返回文件后清理临时文件
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var result = File(fileBytes, contentType, fileName);
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// 异步清理临时文件
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_ = Task.Run(() =>
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{
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try
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{
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Directory.Delete(tempFilePath);
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}
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catch
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{
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// 忽略删除失败
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}
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});
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return result;
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}
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finally
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{
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// 确保临时文件被清理
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if (Directory.Exists(tempFilePath))
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{
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try
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{
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Directory.Delete(tempFilePath);
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}
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catch
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{
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// 忽略删除失败
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}
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}
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}
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}
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catch (Exception ex)
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{
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return StatusCode(500, $"服务器内部错误: {ex.Message}");
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}
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}
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}
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}
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