278 lines
10 KiB
C#
278 lines
10 KiB
C#
using System.Net.Http;
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using System.Net;
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using System.Web.Http;
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using Newtonsoft.Json.Linq;
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using System.Threading.Tasks;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System;
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/////http://127.0.0.1:9981/api/file/browse
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/// <summary>
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///
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/// </summary>
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namespace WebApi
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{
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/// <summary>
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///
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/// </summary>
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[RoutePrefix("api/file")]
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public class IFileController : ApiController
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{
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// 基础路径配置
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private readonly string _basePath = @"D:\CameraImg";
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/// <summary>
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/// 请求DTO
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/// </summary>
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public class FileRequestDto
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{
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public string RelativePath { get; set; } = "";
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}
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/// <summary>
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/// 浏览文件或文件夹，前端传相对路径，返回文件夹内容或文件流（图片等可预览）
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/// </summary>
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[HttpPost]
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[Route("browse")]
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public IHttpActionResult BrowsePath([FromBody] FileRequestDto request)
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{
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try
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{
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if (request == null)
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request = new FileRequestDto();
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if (string.IsNullOrEmpty(request.RelativePath) || request.RelativePath == "/")
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{
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request.RelativePath = "";
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}
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string fullPath = Path.Combine(_basePath, request.RelativePath.Replace('/', Path.DirectorySeparatorChar));
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if (!IsPathSafe(fullPath))
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{
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return Ok(new { success = false, message = "无效的路径" });
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}
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if (!Directory.Exists(fullPath) && !System.IO.File.Exists(fullPath))
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{
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return Ok(new { success = false, message = "路径不存在" });
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}
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if (System.IO.File.Exists(fullPath))
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{
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return GetFilePreview(fullPath, request.RelativePath);
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}
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if (Directory.Exists(fullPath))
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{
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return GetDirectoryContents(fullPath, request.RelativePath);
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}
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return Ok(new { success = false, message = "路径不存在" });
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}
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catch (Exception ex)
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{
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return Ok(new { success = false, message = $"服务器错误: {ex.Message}" });
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}
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}
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/// <summary>
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/// 获取文件预览数据（图片/文本base64，前端可直接预览）
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/// </summary>
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private IHttpActionResult GetFilePreview(string fullPath, string relativePath)
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{
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try
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{
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var fileInfo = new FileInfo(fullPath);
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var extension = fileInfo.Extension.ToLowerInvariant();
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var previewable = IsPreviewableFile(extension);
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var contentType = GetContentType(fileInfo.Name);
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bool tooLarge = fileInfo.Length > 10 * 1024 * 1024; // 10MB限制
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string base64String = null;
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string dataUrl = null;
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bool canPreview = previewable && !tooLarge;
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if (canPreview)
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{
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var fileBytes = System.IO.File.ReadAllBytes(fullPath);
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base64String = Convert.ToBase64String(fileBytes);
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dataUrl = $"data:{contentType};base64,{base64String}";
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}
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var result = new
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{
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success = true,
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type = "file",
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path = relativePath,
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name = fileInfo.Name,
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size = fileInfo.Length,
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extension = fileInfo.Extension,
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contentType = contentType,
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isPreviewable = canPreview,
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base64Data = base64String,
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dataUrl = dataUrl,
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created = fileInfo.CreationTime,
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modified = fileInfo.LastWriteTime,
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message = tooLarge ? "文件过大，无法预览，可下载" : null
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};
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return Ok(result);
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}
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catch (Exception ex)
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{
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return Ok(new { success = false, message = $"获取文件预览失败: {ex.Message}" });
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}
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}
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/// <summary>
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/// 判断文件是否可预览
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/// </summary>
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private bool IsPreviewableFile(string extension)
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{
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var previewableExtensions = new[]
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{
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".bmp", ".jpg", ".jpeg", ".png", ".gif", ".tiff", ".tif", ".webp",
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".txt", ".json", ".xml", ".csv", ".log", ".md"
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};
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return previewableExtensions.Contains(extension);
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}
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/// <summary>
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/// 安全检查：确保路径在基础目录内，防止路径遍历攻击
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/// </summary>
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private bool IsPathSafe(string fullPath)
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{
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try
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{
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var basePath = Path.GetFullPath(_basePath);
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var requestedPath = Path.GetFullPath(fullPath);
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return requestedPath.StartsWith(basePath, StringComparison.OrdinalIgnoreCase);
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}
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catch
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{
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return false;
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}
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}
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/// <summary>
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/// 根据文件扩展名获取MIME类型（兼容C# 7.3）
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/// </summary>
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private string GetContentType(string fileName)
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{
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var extension = Path.GetExtension(fileName).ToLowerInvariant();
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if (extension == ".bmp") return "image/bmp";
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if (extension == ".jpg" || extension == ".jpeg") return "image/jpeg";
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if (extension == ".png") return "image/png";
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if (extension == ".gif") return "image/gif";
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if (extension == ".tiff" || extension == ".tif") return "image/tiff";
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if (extension == ".webp") return "image/webp";
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if (extension == ".pdf") return "application/pdf";
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if (extension == ".txt") return "text/plain";
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if (extension == ".json") return "application/json";
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if (extension == ".xml") return "application/xml";
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if (extension == ".csv") return "text/csv";
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if (extension == ".md") return "text/markdown";
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if (extension == ".log") return "text/plain";
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if (extension == ".zip") return "application/zip";
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if (extension == ".rar") return "application/x-rar-compressed";
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return "application/octet-stream";
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}
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private IHttpActionResult GetDirectoryContents(string fullPath, string relativePath)
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{
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try
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{
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var items = new List<object>();
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var directories = Directory.GetDirectories(fullPath);
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foreach (var dir in directories)
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{
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var dirInfo = new DirectoryInfo(dir);
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var subPath = string.IsNullOrEmpty(relativePath)
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? dirInfo.Name
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: $"{relativePath}/{dirInfo.Name}";
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items.Add(new
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{
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name = dirInfo.Name,
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type = "directory",
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path = subPath,
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created = dirInfo.CreationTime,
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modified = dirInfo.LastWriteTime,
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isPreviewable = false
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});
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}
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var files = Directory.GetFiles(fullPath);
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foreach (var file in files)
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{
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var fileInfo = new FileInfo(file);
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var filePath = string.IsNullOrEmpty(relativePath)
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? fileInfo.Name
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: $"{relativePath}/{fileInfo.Name}";
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var extension = fileInfo.Extension.ToLowerInvariant();
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items.Add(new
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{
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name = fileInfo.Name,
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type = "file",
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path = filePath,
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size = fileInfo.Length,
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extension = fileInfo.Extension,
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created = fileInfo.CreationTime,
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modified = fileInfo.LastWriteTime,
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isPreviewable = IsPreviewableFile(extension),
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contentType = GetContentType(fileInfo.Name)
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});
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}
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var result = new
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{
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success = true,
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type = "directory",
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path = relativePath,
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items = items.OrderBy(x => ((dynamic)x).type == "directory" ? 0 : 1)
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.ThenBy(x => ((dynamic)x).name)
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.ToList()
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};
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return Ok(result);
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}
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catch (Exception ex)
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{
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return Ok(new { success = false, message = $"读取目录失败: {ex.Message}" });
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}
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}
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[HttpPost]
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[Route("download")]
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public IHttpActionResult DownloadFile([FromBody] FileRequestDto request)
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{
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try
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{
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if (request == null || string.IsNullOrEmpty(request.RelativePath))
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return Ok(new { success = false, message = "文件路径不能为空" });
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string fullPath = Path.Combine(_basePath, request.RelativePath.Replace('/', Path.DirectorySeparatorChar));
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if (!IsPathSafe(fullPath) || !System.IO.File.Exists(fullPath))
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return Ok(new { success = false, message = "文件不存在" });
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var fileInfo = new FileInfo(fullPath);
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var contentType = GetContentType(fileInfo.Name);
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var response = new HttpResponseMessage(HttpStatusCode.OK)
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{
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Content = new StreamContent(new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read))
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};
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response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
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response.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment")
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{
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FileName = fileInfo.Name
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};
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return ResponseMessage(response);
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}
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catch (Exception ex)
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{
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return Ok(new { success = false, message = $"下载文件失败: {ex.Message}" });
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}
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}
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}
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}
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