在node.js中过滤post请求的主体

Question

有没有办法在node.js + express中简化这段代码？

// Backend handler to register a new participant

app.post('/api/participant', function (req, res, next) {
    // I'm catching the registration form from the request
    var data = req.body;

    // I want to make sure the user is not uploading data other
    // than the fields in the form
    var participant = new Participant({
        first: data.first,
        last: data.last,
        email: data.email,
        category: data.category
    });
    participant.save(...);
});

我没有这样做:

    var participant = new Participant(data);

因为任何人都可以score在数据对象中包含(例如)属性并以优势开始竞争.

所以我的问题是:我是否必须在每个帖子处理程序中执行此操作,或者是否有过滤属性的方法？

Answer 1

一个快速的谷歌搜索没有找到任何预先存在的库,但这个功能应该很好地完成这个技巧:

function filterKeys(object, keys) {
    Object.keys(object).forEach(function(key) {
        if(keys.indexOf(key) == -1) {
            delete object[key];
        }
    });
}

举个例子,

var foo = {"foo": 1, "bar": 2, "baz": 3};
console.log(foo); // {"foo": 1, "bar": 2, "baz": 3}
filterKeys(foo, ["foo", "baz"]);
console.log(foo); // {"foo": 1, "baz": 3}

所以在你的情况下,

filterKeys(data, ["first", "last", "email", "category"]);