express验证器:是否可以链接不同的用户验证规则

Question

我有以下几乎类似的规则，除了一个路由参数是可选的，另一个是强制性的。需要将它们组合起来，这样我就可以将单个代码可互换地用于强制条件，将其他代码用于可选条件

有没有办法组合它们，这样我就没有多余的代码了？

const pathParamValidation = check('convertedUrlId')
.isLength({ min: 5, max: 6 })
.withMessage({
error: 'Invalid length',
detail: {
convertedUrlId:
'Invalid Length! Character length >=5 and <7 characters are allowed',
},
})
.matches(/^[~A-Za-z0-9/./_/-]*$/)
.withMessage({
error: 'Invalid characters',
detail: {
convertedUrlId:
'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
},
});

#可选

const optionalConvertedUrlIdValidation = check('convertedUrlId')
.optional()
.matches(/^[~A-Za-z0-9/./_/-]*$/)
.withMessage({
error: 'Invalid characters',
detail: {
convertedUrlId:
'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
},
})
.isLength({ min: 5, max: 6 })
.withMessage({
error: 'Invalid length',
detail: {
convertedUrlId:
'Invalid Length! Character length >=5 and <7 characters are allowed',
},
});

我试着用这种方式组合，但没有成功

const checkConvertedUrlSchema = check('convertedUrlId')
.matches(/^[~A-Za-z0-9/./_/-]*$/)
.withMessage({
error: 'Invalid characters',
detail: {
convertedUrlId:
'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
},
});
const checkConvertedUrlLength = check('convertedUrlId')
.isLength({ min: 5, max: 6 })
.withMessage({
error: 'Invalid length',
detail: {
convertedUrlId:
'Invalid Length! Character length >=5 and <7 characters are allowed',
},
});
const convertedUrlIdValidation =
check('convertedUrlId').checkConvertedUrlLength.checkConvertedUrlSchema;
const optionalConvertedUrlIdValidation =
check('convertedUrlId').optional().checkConvertedUrlSchema
.checkConvertedUrlLength;

Answer 1

您可以创建一个验证器工厂来创建通用验证规则。

import { body, validationResult } from 'express-validator';
import express from 'express';
const app = express();
const convertedUrlIdValidationFactory = () =>
body('convertedUrlId')
.isLength({ min: 5, max: 6 })
.withMessage({
error: 'Invalid length',
detail: {
convertedUrlId: 'Invalid Length! Character length >=5 and <7 characters are allowed',
},
})
.matches(/^[~A-Za-z0-9/./_/-]*$/)
.withMessage({
error: 'Invalid characters',
detail: {
convertedUrlId: 'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
},
});
app.use(express.json());
app.post('/optional', convertedUrlIdValidationFactory().optional(), (req, res) => {
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
console.log(req.body);
res.sendStatus(200);
});
app.post('/required', convertedUrlIdValidationFactory(), (req, res) => {
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
console.log(req.body);
res.sendStatus(200);
});
app.listen(3000, () => console.log('server started at port 3000'));

测试用例1：没有convertedUrlId数据。

⚡  curl -X POST http://localhost:3000/required
{"errors":[{"msg":{"error":"Invalid length","detail":{"convertedUrlId":"Invalid Length! Character length >=5 and <7 characters are allowed"}},"param":"convertedUrlId","location":"body"}]}%
⚡  curl -X POST http://localhost:3000/optional
OK%  

测试用例2：有一个convertedUrlId数据。

⚡  curl -X POST -H "Content-Type: application/json" --data '{"convertedUrlId": "12345"}' http://localhost:3000/required
OK% 
⚡  curl -X POST -H "Content-Type: application/json" --data '{"convertedUrlId": "12345"}' http://localhost:3000/optional
OK%

Answer 2

这对我有效

const checkConvertedUrlSchema = (chain) =>
chain.matches(/^[~A-Za-z0-9/./_/-]*$/).withMessage({
error: 'Invalid characters',
detail: {
convertedUrlId:
'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
},
});
const checkConvertedUrlLength = (chain) =>
chain.isLength({ min: 5, max: 6 }).withMessage({
error: 'Invalid length',
detail: {
convertedUrlId:
'Invalid Length! Character length >=5 and <7 characters are allowed',
},
});
const checkConvertedUrlIdBodyValidation = (chain) =>
chain
.not()
.isEmpty()
.withMessage({
error: 'Invalid Request Body',
detail: {
convertedUrlId:
'Request Syntax Error! convertedUrlId parameter is required',
},
});
const convertedUrlIdBodyValidation = checkConvertedUrlLength(
checkConvertedUrlSchema(
checkConvertedUrlIdBodyValidation(check('convertedUrlId'))
)
);
const convertedUrlIdValidation = checkConvertedUrlLength(
checkConvertedUrlSchema(check('convertedUrlId'))
);
const optionalConvertedUrlIdValidation = convertedUrlIdValidation.optional();