node.js - 如果用户验证失败，在multer中停止文件上传

Question

文件上传是由multer使用此代码完成的，但是如何在用户验证失败时停止文件上传。在此代码中编写用户验证部分的位置

router.post('/profilePicture',
 multer({dest: './uploads/',
rename: function (fieldname, filename,req,res) {
      return image = req.body.userId+'-'+dateTime+'-'+randomId();
    },
    onFileUploadStart: function (file,req,res) {
        if(file.mimetype !== 'image/jpg' && file.mimetype !== 'image/jpeg' && file.mimetype !== 'image/png') {
          imageUploadDone = false;
          return false;
        }
        //console.log(file.originalname + ' is starting ...');
    },
    onFileUploadComplete: function (file,req,res) {
      //console.log(file.fieldname + ' uploaded to  ' + file.path);
      if(file.mimetype == 'image/jpg')
        extn  = '.jpg';
      if(file.mimetype == 'image/jpeg')
        extn  = '.jpeg';
      if(file.mimetype == 'image/png')
        extn  = '.png';
      imageUploadDone=true; 
    }
}),function(req, res) { 
      upload(req,res,function(err) {
    if(imageUploadDone==true){
      //console.log(image);
      var userInfo = {'userId':req.body.userId,'newImage':address+image+extn,'path':'./uploads/'};
          db.profilePicture(userInfo,function(result){
            if(result.message == 'image path added'){
              res.json({'success':'1','result':{'message':'Profile Picture Updated','imageUrl':address+image+extn},'error':'No Error'});
            }
          });
    }
    if(imageUploadDone == false){
    res.json({'success':'0','result':{},'error':'file format is not supported'});
  }
  });
});

我尝试在 onFileUploadStart 和 onFileUploadComplete 等事件上验证用户。如果用户仍然无效，文件仍会上传到路径。

Answer 1

这现在可以在 1.0.0 中实现。

如果您想中止上传:

multer({
      fileFilter: function (req, file, cb) {
         if (path.extname(file.originalname) !== '.pdf') {
                 return cb(new Error('Only pdfs are allowed'))
          }

         cb(null, true)
       }
 })

如果要跳过任何非 pdf 文件:

multer({
      fileFilter: function (req, file, cb) {
          if (path.extname(file.originalname) !== '.pdf') {
                  return cb(null, false)
       }

      cb(null, true)
      }
 })