DigitalScholl/Learun.Framework.Ultimate V7/Learun.Application.WebApi/Modules/AnnexesApiWx.cs

using Learun.Application.Base.SystemModule;
using Learun.Util;
using Nancy;
using System;
using System.Collections.Generic;
using System.IO;

namespace Learun.Application.WebApi.Modules
{
  public class AnnexesApiWx : BaseApi
  {
    public AnnexesApiWx()
        : base("/learun/adms/annexes")
    {
      Get["/wxlist"] = WxGetList;
      Get["/wxdown"] = WxDownload;
      Get["/wxfileinfo"] = WxFileInfo;
      Post["/wxupload"] = WxUpload;
      Post["/wxdelete"] = WxDeleteFile;
    }
    private AnnexesFileIBLL annexesFileIBLL = new AnnexesFileBLL();

    /// <summary>
    /// 获取附件列表
    /// </summary>
    /// <param name="_"></param>
    /// <returns></returns>
    public Response WxGetList(dynamic _)
    {
      var keyValue = this.GetReqData();
      var list = annexesFileIBLL.GetList(keyValue);

      return Success(list);
    }

    /// <summary>
    /// 上传附件图片文件
    /// <summary>
    /// <returns></returns>
    public Response WxUpload(dynamic _)
    {
      var files = (List<HttpFile>)this.Context.Request.Files;
      var folderId = this.GetReqData();

      string filePath = Config.GetValue("AnnexesFile");
      string uploadDate = DateTime.Now.ToString("yyyyMMdd");
      string fileEextension = Path.GetExtension(files[0].Name);
      string fileType = fileEextension.Replace(".", "");
      string fileGuid = Guid.NewGuid().ToString();

      string virtualPath = string.Format("{0}/{1}/{2}/{3}{4}", filePath, userInfo.userId, uploadDate, fileGuid, fileEextension);

      //创建文件夹
      string path = Path.GetDirectoryName(virtualPath);
      Directory.CreateDirectory(path);
      AnnexesFileEntity fileAnnexesEntity = new AnnexesFileEntity();
      if (!System.IO.File.Exists(virtualPath))
      {
        byte[] bytes = new byte[files[0].Value.Length];
        files[0].Value.Read(bytes, 0, bytes.Length);
        FileInfo file = new FileInfo(virtualPath);
        FileStream fs = file.Create();
        fs.Write(bytes, 0, bytes.Length);
        fs.Close();

        //文件信息写入数据库
        fileAnnexesEntity.F_Id = fileGuid;
        fileAnnexesEntity.F_FileName = files[0].Name;
        fileAnnexesEntity.F_FilePath = virtualPath;
        fileAnnexesEntity.F_FileSize = files[0].Value.Length.ToString();
        fileAnnexesEntity.F_FileExtensions = fileEextension;
        fileAnnexesEntity.F_FileType = fileType;
        fileAnnexesEntity.F_CreateUserId = userInfo.userId;
        fileAnnexesEntity.F_CreateUserName = userInfo.realName;

        annexesFileIBLL.SaveEntity(folderId, fileAnnexesEntity);
      }

      return SuccessString(fileGuid);
    }

    /// <summary>
    /// 获取文件信息
    /// </summary>
    /// <param name="_"></param>
    /// <returns></returns>
    public Response WxFileInfo(dynamic _)
    {
      var fileId = this.GetReqData();
      var fileEntity = annexesFileIBLL.GetEntity(fileId);

      return Success(fileEntity);
    }

    /// <summary>
    /// 删除文件
    /// </summary>
    /// <param name="_"></param>
    /// <returns></returns>
    public Response WxDeleteFile(dynamic _)
    {
      var fileId = this.GetReqData();
      AnnexesFileEntity fileInfoEntity = annexesFileIBLL.GetEntity(fileId);
      annexesFileIBLL.DeleteEntity(fileId);
      //删除文件
      if (System.IO.File.Exists(fileInfoEntity.F_FilePath))
      {
        System.IO.File.Delete(fileInfoEntity.F_FilePath);
      }

      return Success("删除成功");
    }

    /// <summary>
    /// 下载文件，微信小程序用
    /// 
    /// 微信小程序可以预览图片、文档
    /// 支持的图片格式：.jpg .png .webp .gif
    /// 支持的文档格式：.doc(x) .xls(x) .ppt(x) .pdf
    /// 
    /// 对于其他格式的文件，微信小程序官方未提供打开或预览的 API，文件对用户来说不可访问
    /// </summary>
    /// <param name="_"></param>
    /// <returns></returns>
    public Response WxDownload(dynamic _)
    {
      string name = this.GetReqData();
      string fileId = name.Split('.')[0];
      var fileEntity = annexesFileIBLL.GetEntity(fileId);
      string filepath = fileEntity.F_FilePath;

      if (!FileDownHelper.FileExists(filepath))
      {
        return 404;
      }

      FileDownHelper.DownLoadWx(filepath, fileEntity.F_FileType);

      return Success("");
    }
  }
}