app.UseStaticFiles();

namespace webapi;
/// 

/// 统一数据响应格式
/// 
public class Results
{
    /// 

    /// 自定义的响应码，可以和http响应码一致，也可以不一致
    /// 
    public int Code { get; set; }
    /// 

    /// 中文消息提示
    /// 
    public string? Msg { get; set; }
    /// 

    /// 是否成功
    /// 
    public bool Success { get; set; }
    /// 

    /// 响应的数据
    /// 
    public T? Data { get; set; }
    /// 

    /// 返回的Token: 如果有值，则前端需要此这个值替旧的token值
    /// 
    public string? Token { get; set; }
    /// 

    /// 设置数据的结果
    /// 
    /// 数据
    /// 
    public static Results DataResult(T data)
    {
        return new Results { Code = 1, Data = data, Msg = "请求成功", Success = true };
    }
    /// 

    /// 响应成功的结果
    /// 
    /// 
    /// 
    public static Results SuccessResult(string msg = "操作成功")
    {
        return new Results { Code = 1, Data = default, Msg = msg, Success = true };
    }
    /// 

    /// 响应失败的结果
    /// 
    /// 
    /// 
    public static Results FailResult(string msg = "请求失败")
    {
        return new Results { Code = -1, Data = default, Msg = msg, Success = false };
    }
    /// 

    /// 参数有误
    /// 
    /// 
    /// 
    public static Results InValidParameter(string msg = "参数有误")
    {
        return new Results { Code = -1, Data = default, Msg = msg, Success = false };
    }
    /// 

    /// 获取结果
    /// 
    /// 
    /// 
    /// 
    /// 
    /// 
    public static Results GetResult(int code = 0, string? msg = null, T? data = default, bool success = true)
    {
        return new Results { Code = code, Data = data, Msg = msg, Success = success };
    }
    /// 

    /// 设置token结果
    /// 
    /// 
    /// 
    public static Results TokenResult(string token)
    {
        return new Results { Code = 1, Data = default, Msg = "请求成功", Success = true, Token = token };
    }
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.WebUtilities;
using Microsoft.Net.Http.Headers;
namespace webapi.Controllers;
/// 

/// 文件上传
/// 
[ApiController]
[Route("[controller]/[action]")]
public class UploadController : ControllerBase
{
    private readonly IWebHostEnvironment _hostEnvironment;
    /// 

    /// 注入服务
    /// 
    /// 
    public UploadController(IWebHostEnvironment hostEnvironment)
    {
        _hostEnvironment = hostEnvironment;
    }
    /// 

    /// 上传文件（支持多文件/大文件500M）
    /// 
    /// 
    [HttpPost]
    [RequestFormLimits(MultipartBodyLengthLimit = 609715200)]
    [RequestSizeLimit(609715200)]
    public async Task>> UploadFile()
    {
        var request = HttpContext.Request;
        if (!request.HasFormContentType ||
            !MediaTypeHeaderValue.TryParse(request.ContentType, out var mediaTypeHeader) ||
            string.IsNullOrEmpty(mediaTypeHeader.Boundary.Value))
        {
            return Results>.FailResult("文件类型不支持");
        }
        var reader = new MultipartReader(mediaTypeHeader.Boundary.Value, request.Body);
        var section = await reader.ReadNextSectionAsync();
        List serverFilePathList = new();
        while (section != null)
        {
            var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition,
                out var contentDisposition);
            if (hasContentDispositionHeader && contentDisposition!.DispositionType.Equals("form-data") &&
                !string.IsNullOrEmpty(contentDisposition.FileName.Value))
            {
                // 获取文件后缀名
                var extension = Path.GetExtension(contentDisposition.FileName.Value);
                // 为文件重命名，防止文件重名
                var fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + extension;
                // 文件保存的文件夹路径
                var uploadPath = Path.Combine(_hostEnvironment.WebRootPath, "upload");
                if (!Directory.Exists(uploadPath))
                {
                    Directory.CreateDirectory(uploadPath);
                }
                var fileFullPath = Path.Combine(uploadPath, fileName);
                try
                {
                    using var targetStream = System.IO.File.Create(fileFullPath);
                    await section.Body.CopyToAsync(targetStream);
                    serverFilePathList.Add("/upload/" + fileName);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e);
                }
            }
            section = await reader.ReadNextSectionAsync();
        }
        return Results>.DataResult(serverFilePathList);
    }
}