Controllers/DownloadController.cs

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using HeyRed.Mime;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using Tmp.Models;

namespace Tmp.Controllers;

[Route("download")]
public class DownloadController : Controller
{
    private readonly Configuration Configuration;

    public DownloadController(IOptions<Configuration> options)
    {
        Configuration = options.Value;
    }

    [HttpHead("file/{cipher}/{filePath}")]
    public IActionResult HttpHead(string filePath, string cipher)
    {
        // 构建文件的完整路径
        var fullPath = Path.Combine(Configuration.UploadPath, $"{cipher}", filePath);

        // 检查文件是否存在
        if (!System.IO.File.Exists(fullPath))
        {
            return NotFound();
        }
        Response.Headers.Add("Accept-Ranges", "bytes");
        return Ok();
    }



    [HttpGet("file/{cipher}/{filePath}")]
    public IActionResult Download(string filePath, string cipher)
    {
        // 构建文件的完整路径
        var fullPath = Path.Combine(Configuration.UploadPath, $"{cipher}", filePath);

        // 检查文件是否存在
        if (!System.IO.File.Exists(fullPath))
        {
            return NotFound();
        }

        // 获取文件信息
        var fileInfo = new FileInfo(fullPath);
        var fileSize = fileInfo.Length;

        // 检查是否支持断点续传
        var isRangeRequest = Request.Headers.ContainsKey("Range");
        if (isRangeRequest)
        {
            // 解析 Range 头部，获取断点续传的起始位置和结束位置
            var rangeHeader = Request.Headers["Range"].ToString();
            var (startByte, endByte) = GetRange(rangeHeader, fileSize);

            // 设置响应头部
            Response.StatusCode = 206; // Partial Content