验证图像上传

问题描述

我正在尝试验证图像上传，以确保用户实际上传了图像而不是其他任何文件。这是我在app.js中的自定义验证

const  {checkSchema}  = require('express-validator/check');
app.use(checkSchema({
  customValidators: {
    isImage: function (value,filename) {
      var extension = (path.extname(filename)).toLowerCase();
      switch (extenion) {
        case ".jpg":
          return ".jpg";
        case ".png":
          return ".png";
        case ".jpeg":
          return ".jpeg";
        case "":
          return ".jpg";
        default:
          return false;
      }
    }
  }
})) 

这是我进行验证的发布路线

router.post('/add-product',[
        imageFile = typeof req.files["image"] !== "undefined" ? req.files["image"][0].filename : "",check("title","Title must have a value.").not().isEmpty(),check("desc","Description must have a value.").not().isEmpty(),check("price","Price must have a value.").not().isDecimal(),check("image","you must upload an image.").not().isImage(imageFile)
    ],function (req,res) {
        var title = req.body.title;
        var slug = slug = title.replace(/\#+/g,"-").toLowerCase();
        var desc = req.body.desc;
        var price = req.body.price;
        var category = req.body.category;
        const result = validationResult(req);
        var errors = result.errors;
        if (!result.isEmpty()) {
            Category.find(function (err,categories) {
                res.render("admin/add_product",{
                    errors: errors,title: title,desc: desc,price: price,categories: categories
                })
            })
        }

这是我尝试对其进行测试后得到的错误

express-validator: a validator/sanitizer with name isImage does not exist
C:\Users\LayintonDev\Desktop\cartTutorial\routes\admin_products.js:57
            imageFile = typeof req.files["image"] !== "undefined" ? req.files["image"][0].filename : "",^

ReferenceError：未定义req 在对象。 （C：\ Users \ LayintonDev \ Desktop \ cartTutorial \ routes \ admin_products.js：57：32）

解决方法

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