req.check 在 express-validator 中不起作用？

Question

我正在验证密码的验证器页面。

exports.userSignupValidator = (req, res, next) => {
    // check for password
    req.check('password', 'Password is required').notEmpty();
    req.check('password')
        .isLength({ min: 6 })
        .withMessage('Password must contain at least 6 characters')
        .matches(/\d/)
        .withMessage('Password must contain a number');
    // check for errors
    const errors = req.validationErrors();
    // if error show the first one as they happen
    if (errors) {
        const firstError = errors.map(error => error.msg)[0];
        return res.status(400).json({ error: firstError });
    }
    // proceed to next middleware
    next();
};

我在其中定义注册路由并将 userSignupValidation 作为中间件来验证密码的路由页面。

router.post("/signup", userSignupValidator, async(req, res) => {
    const {name, email, password} = req.body;
    try{
        await User.findByCredentials(name, email, password);
        const user = new User({
            name,
            email,
            password
        })
        await user.save();
        res.send({message: "Successfully Registered"});
    }
    catch(e){
        res.status(422).send({error: e.message});
    }
})

为什么我得到 req.check 不起作用。

Answer 1

此代码适用于第 6 版 express-validator。您可以查看 express-validator 的文档 -> https://express-validator.github.io/docs/migration-v5-to-v6.html

exports.userSignupValidator = async(req, res, next) => {
    // check for password
    await body('password', 'password is required').notEmpty().run(req)
    await body('password')
        .isLength({ min: 6 })
        .withMessage('Password must contain at least 6 characters').run(req)
    // check for errors
    const errors = validationResult(req);
    console.log(errors.errors);
    // if error show the first one as they happen
    if (!errors.isEmpty()) {
        const firstError = errors.errors.map(error => error.msg)[0];
        return res.status(400).json({ error: firstError });
    }
    // proceed to next middleware
    next();
};

Answer 2

有几件事会阻止您的代码正常工作，我还建议您在此解决方案之后查看express-validator docs，非常全面。所以让我们开始吧。

Check 函数负责将您的验证规则添加到请求正文中，而validationResult 是负责执行并确保请求正文遵循此规则的函数。照这样说， 以下是解决问题的方法。

因为你喜欢模块化，所以把你的验证规则写成这样的函数：

uservalidation.js

const { check, validationResult } = require("express-validator") 

//this sets the rules on the request body in the middleware
const validationRules = () => {
    return [
        check('password')
        .notEmpty()
        .withMessage('Password is required')
        .isLength({ min: 6 })
        .withMessage('Password must contain at least 6 characters')
        .matches(/\d/)
        .withMessage('Password must contain a number'),
        //you can now add other rules for other inputs here, like username, email...
        // notice how validation rules of a single field is chained and not seperated
    ]
}

//while this function executes the actual rules against the request body
const validation =  ()  => {
    return (req, res, next) => {
        //execute the rules
        const errors = validationResult(req)
        // check if any of the request body failed the requirements set in validation rules
        if (!errors.isEmpty()) {
            // heres where you send the errors or do whatever you please with the error, in  your case 
            res.status(400).json{error:errors}
            return
        }
        // if everything went well, and all rules were passed, then move on to the next middleware
        next();   
    }
}

现在在你的实际路线中，你可以拥有这个

userroute.js

//import the functions declared above.
const { validationRules, validation } = require("./uservalidation.js")

// for your sign up route

// call the validationRules function, followed by the validation
router.post("/signup", validationRules(),validation(), async(req, res) => {
    const {name, email, password} = req.body;
    try{
        await User.findByCredentials(name, email, password);
        const user = new User({
            name,
            email,
            password
        })
        await user.save();
        res.send({message: "Successfully Registered"});
    }
    catch(e){
        res.status(422).send({error: e.message});
    }
})