fanhongcai
01c9cc2330
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394 lines
14 KiB
C#
394 lines
14 KiB
C#
using System.Text;
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using Aliyun.OSS;
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using Microsoft.AspNetCore.Mvc;
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using WenChuanyi.Api.Dtos;
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using WenChuanyi.Api.Models;
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using WenChuanyi.Api.Services;
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namespace WenChuanyi.Api.Controllers;
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/// <summary>文件上传 / 查询 / 标签列表 / 预览 / 下载</summary>
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[ApiController]
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[Route("api/files")]
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public class FileController : ControllerBase
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{
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private readonly IFreeSql _fsql;
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private readonly CodeGeneratorService _codeGen;
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private readonly OssStorageService _oss;
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private readonly string _baseUrl;
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private readonly ILogger<FileController> _logger;
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public FileController(IFreeSql fsql, CodeGeneratorService codeGen, OssStorageService oss,
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IConfiguration cfg, ILogger<FileController> logger)
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{
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_fsql = fsql;
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_codeGen = codeGen;
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_oss = oss;
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_baseUrl = cfg["App:BaseUrl"] ?? "";
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_logger = logger;
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}
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// ---------- 上传 ----------
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/// <summary>multipart 上传：file + expireHours(24/168/0) + password + tag（password 与 tag 可同时设置）</summary>
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[HttpPost("upload")]
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[RequestSizeLimit(220_200_960)] // 210MB（Kestrel 同配置）
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[RequestFormLimits(MultipartBodyLengthLimit = 220_200_960)] // 210MB（默认 128MB，会拒 >128MB 的 multipart 上传）
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public async Task<IActionResult> Upload([FromForm] int expireHours, [FromForm] string? password,
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[FromForm] string? tag, IFormFile? file)
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{
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if (file == null || file.Length == 0)
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{
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return BadRequest(new { message = "请选择要上传的文件" });
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}
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if (file.Length > FileRules.MaxFileBytes)
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{
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return BadRequest(new { message = "文件超过 200MB 限制，无法上传" });
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}
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var pwdErr = FileRules.ValidatePassword(password);
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if (pwdErr != null) return BadRequest(new { message = pwdErr });
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tag = string.IsNullOrWhiteSpace(tag) ? null : tag.Trim();
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var tagErr = FileRules.ValidateTag(tag);
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if (tagErr != null) return BadRequest(new { message = tagErr });
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var hasPassword = !string.IsNullOrEmpty(password);
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var hasTag = !string.IsNullOrEmpty(tag);
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// 有效期：仅 24/168/0 三档；含标签强制永久
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var effectiveExpire = hasTag ? 0 : (expireHours is 24 or 168 or 0 ? expireHours : 24);
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var isPermanent = hasTag || effectiveExpire == 0;
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DateTime? expiresAt = isPermanent ? null : DateTime.Now.AddHours(effectiveExpire);
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var fileType = FileRules.ResolveFileType(hasPassword, hasTag);
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var originalName = FileRules.SanitizeFileName(file.FileName);
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var objectKey = _oss.BuildObjectKey(originalName);
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var ip = HttpContext.Connection.RemoteIpAddress?.ToString();
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var contentType = string.IsNullOrEmpty(file.ContentType) ? "application/octet-stream" : file.ContentType;
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try
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{
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await using var stream = file.OpenReadStream();
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await _oss.UploadAsync(objectKey, stream, contentType);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "OSS 上传失败：{Name}", file.FileName);
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return StatusCode(500, new { message = "文件上传失败，请稍后重试" });
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}
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var item = new FileItem
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{
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PickCode = await _codeGen.GeneratePickCodeAsync(FileRules.PickCodeLength(fileType)),
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AdminCode = await _codeGen.GenerateAdminCodeAsync(),
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FileType = fileType,
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Password = hasPassword ? password : null,
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Tag = hasTag ? tag : null,
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OriginalName = originalName,
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ObjectKey = objectKey,
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Size = file.Length,
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MimeType = contentType,
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DownloadCount = 0,
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UploadIp = ip,
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IsPermanent = isPermanent,
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ExpiresAt = expiresAt,
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CreatedAt = DateTime.Now
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};
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await _fsql.Insert(item).ExecuteAffrowsAsync();
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return Ok(new UploadResultDto
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{
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Id = item.Id,
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PickCode = item.PickCode,
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AdminCode = item.AdminCode,
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FileType = fileType,
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OriginalName = item.OriginalName,
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Size = item.Size,
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IsPermanent = isPermanent,
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ExpiresAt = expiresAt,
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PickUrl = BuildPickUrl(item.PickCode)
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});
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}
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// ---------- 查询 ----------
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/// <summary>按取件码查询（私密需带 password；过期返回 410）</summary>
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[HttpGet("{code}")]
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public async Task<IActionResult> Query(string code, [FromQuery] string? password)
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{
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if (!IsPickCode(code))
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{
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return NotFound(new { message = "取件码/标签无效" });
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}
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var (item, error, status) = await FindAndValidateAsync(code, password);
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if (item == null)
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{
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return StatusCode(status, new { message = error });
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}
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return Ok(ToDto(item));
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}
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/// <summary>按标签查询文件列表（CreatedAt 倒序，limit 100）</summary>
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[HttpGet("by-tag/{tag}")]
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public async Task<IActionResult> ByTag(string tag)
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{
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if (string.IsNullOrEmpty(tag) || !tag.All(char.IsLetterOrDigit))
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{
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return BadRequest(new { message = "标签无效" });
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}
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var list = await _fsql.Select<FileItem>()
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.Where(f => f.Tag == tag)
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.OrderByDescending(f => f.CreatedAt)
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.Limit(100)
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.ToListAsync();
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return Ok(list.Select(ToDto));
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}
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// ---------- 下载 ----------
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/// <summary>流式下载：计数 +1（仅统计），还原原始文件名，支持 Range 断点续传（私密需密码）</summary>
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[HttpGet("{code}/download")]
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public async Task<IActionResult> Download(string code, [FromQuery] string? password)
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{
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var (item, error, status) = await FindAndValidateAsync(code, password);
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if (item == null)
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{
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return StatusCode(status, new { message = error });
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}
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await _fsql.Update<FileItem>()
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.Set(f => f.DownloadCount + 1)
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.Where(f => f.Id == item.Id)
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.ExecuteAffrowsAsync();
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await ServeStreamAsync(item, inline: false);
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return new EmptyResult();
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}
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// ---------- 预览 ----------
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/// <summary>在线预览：PDF/图片（≤30MB）/ 音视频白名单（不限大小）inline 流；不计次数</summary>
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[HttpGet("{code}/preview")]
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public async Task<IActionResult> Preview(string code, [FromQuery] string? password)
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{
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var (item, error, status) = await FindAndValidateAsync(code, password);
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if (item == null)
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{
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return StatusCode(status, new { message = error });
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}
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var ext = Path.GetExtension(item.OriginalName).ToLowerInvariant();
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var mime = item.MimeType ?? "";
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if (FileRules.IsText(ext))
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{
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return await ServeTextContentAsync(item);
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}
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if (FileRules.IsPdfOrImage(mime))
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{
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if (item.Size > FileRules.MaxPdfImagePreview)
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{
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return BadRequest(new { message = "文件过大，请下载后查看" });
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}
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await ServeStreamAsync(item, inline: true);
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return new EmptyResult();
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}
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if (FileRules.IsVideoWhitelist(ext) || FileRules.IsAudioWhitelist(ext))
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{
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await ServeStreamAsync(item, inline: true);
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return new EmptyResult();
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}
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return BadRequest(new { message = "该格式不支持在线预览，请下载查看" });
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}
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/// <summary>文本类内容（≤2MB），供在线阅读渲染（私密需密码）</summary>
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[HttpGet("{code}/content")]
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public async Task<IActionResult> GetContent(string code, [FromQuery] string? password)
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{
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var (item, error, status) = await FindAndValidateAsync(code, password);
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if (item == null)
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{
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return StatusCode(status, new { message = error });
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}
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if (!FileRules.IsText(Path.GetExtension(item.OriginalName).ToLowerInvariant()))
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{
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return BadRequest(new { message = "该类型不支持文本预览" });
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}
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return await ServeTextContentAsync(item);
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}
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// ---------- 私有辅助 ----------
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private static bool IsPickCode(string code)
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=> code.Length is 6 or 8 && code.All(char.IsDigit);
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/// <summary>校验取件码 + 过期（懒检查）+ 私密密码；错误时返回 (null, message, status)</summary>
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private async Task<(FileItem? Item, string? Error, int Status)> FindAndValidateAsync(string code, string? password)
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{
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if (!IsPickCode(code))
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{
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return (null, "取件码/标签无效", StatusCodes.Status404NotFound);
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}
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var item = await _fsql.Select<FileItem>().Where(f => f.PickCode == code).FirstAsync();
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if (item == null)
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{
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return (null, "取件码/标签无效", StatusCodes.Status404NotFound);
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}
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if (!item.IsPermanent && item.ExpiresAt != null && item.ExpiresAt < DateTime.Now)
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{
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return (null, "文件已过期", StatusCodes.Status410Gone);
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}
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if (item.FileType == "private")
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{
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if (string.IsNullOrEmpty(password) || password != item.Password)
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{
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return (null, "密码错误", StatusCodes.Status401Unauthorized);
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}
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}
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return (item, null, StatusCodes.Status200OK);
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}
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private FileInfoDto ToDto(FileItem f) => new()
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{
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Id = f.Id,
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PickCode = f.PickCode,
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FileType = f.FileType,
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HasPassword = f.FileType == "private",
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OriginalName = f.OriginalName,
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Size = f.Size,
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MimeType = f.MimeType,
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DownloadCount = f.DownloadCount,
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IsPermanent = f.IsPermanent,
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ExpiresAt = f.ExpiresAt,
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CreatedAt = f.CreatedAt,
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ExpireText = FileRules.ExpireText(f)
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};
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private string BuildPickUrl(string pickCode)
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=> $"{_baseUrl}/#/pickup?code={pickCode}";
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/// <summary>OSS 流式输出到响应（inline/attachment + Range 206 透传）</summary>
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private async Task ServeStreamAsync(FileItem item, bool inline)
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{
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var rangeHeader = Request.Headers.Range.ToString();
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long? start = null, end = null;
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if (!string.IsNullOrEmpty(rangeHeader) && TryParseRange(rangeHeader, item.Size, out var rs, out var re))
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{
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start = rs;
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end = re;
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}
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OssObject obj;
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try
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{
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obj = _oss.GetObject(item.ObjectKey, start, end);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "OSS 读取失败：{Key}", item.ObjectKey);
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Response.StatusCode = StatusCodes.Status500InternalServerError;
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await Response.WriteAsync("文件读取失败，请稍后重试");
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return;
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}
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Response.StatusCode = StatusCodes.Status200OK;
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Response.ContentType = item.MimeType ?? "application/octet-stream";
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Response.Headers["Accept-Ranges"] = "bytes";
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Response.Headers["Content-Disposition"] = inline
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? "inline"
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: $"attachment; filename*=UTF-8''{Uri.EscapeDataString(item.OriginalName)}";
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if (start.HasValue)
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{
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Response.StatusCode = StatusCodes.Status206PartialContent;
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var actualEnd = end < 0 || end == null ? item.Size - 1 : end.Value;
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Response.Headers["Content-Range"] = $"bytes {start}-{actualEnd}/{item.Size}";
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}
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Response.Headers["Content-Length"] = obj.ContentLength.ToString();
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await obj.Content.CopyToAsync(Response.Body);
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}
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/// <summary>文本内容读取（≤2MB，UTF-8 优先，GBK 兜底）</summary>
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private async Task<IActionResult> ServeTextContentAsync(FileItem item)
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{
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if (item.Size > FileRules.MaxTextPreview)
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{
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return BadRequest(new { message = "文件过大，请下载后查看" });
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}
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OssObject obj;
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try
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{
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obj = _oss.GetObject(item.ObjectKey);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "OSS 读取失败：{Key}", item.ObjectKey);
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return StatusCode(500, new { message = "文件读取失败，请稍后重试" });
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}
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using var ms = new MemoryStream();
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await obj.Content.CopyToAsync(ms);
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var bytes = ms.ToArray();
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var text = DecodeText(bytes);
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return Content(text, "text/plain; charset=utf-8");
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}
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private static string DecodeText(byte[] bytes)
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{
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if (bytes.Length >= 3 && bytes[0] == 0xEF && bytes[1] == 0xBB && bytes[2] == 0xBF)
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{
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return Encoding.UTF8.GetString(bytes, 3, bytes.Length - 3);
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}
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if (bytes.Length >= 2 && bytes[0] == 0xFF && bytes[1] == 0xFE)
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{
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return Encoding.Unicode.GetString(bytes, 2, bytes.Length - 2);
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}
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return IsValidUtf8(bytes) ? Encoding.UTF8.GetString(bytes) : Encoding.GetEncoding("GBK").GetString(bytes);
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}
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private static bool IsValidUtf8(byte[] bytes)
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{
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try
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{
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var decoder = new UTF8Encoding(false, true).GetDecoder();
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var charCount = decoder.GetCharCount(bytes, 0, bytes.Length, flush: true);
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return charCount >= 0;
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}
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catch (DecoderFallbackException)
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{
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return false;
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}
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}
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private static bool TryParseRange(string rangeHeader, long total, out long start, out long end)
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{
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start = 0;
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end = -1; // -1 表示到文件末尾
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if (string.IsNullOrEmpty(rangeHeader) || !rangeHeader.StartsWith("bytes=", StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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var spec = rangeHeader["bytes=".Length..];
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var idx = spec.IndexOf('-');
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if (idx < 0) return false;
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var startPart = spec[..idx];
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var endPart = spec[(idx + 1)..];
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if (startPart.Length > 0 && long.TryParse(startPart, out start))
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{
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if (start >= total) return false;
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if (endPart.Length > 0 && long.TryParse(endPart, out var e))
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{
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end = Math.Min(e, total - 1);
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if (start > end) return false;
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}
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// "bytes=start-"：end 保持 -1（到末尾）
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}
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else if (endPart.Length > 0 && long.TryParse(endPart, out var suffix))
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{
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// "bytes=-N"：末尾 N 字节
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start = Math.Max(0, total - suffix);
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end = -1;
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}
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else
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{
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return false;
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}
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return true;
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}
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}
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