express-validator：是否可以鏈接不同的用戶驗證規則？

我有以下幾乎相似的規則，除了一個路由引數是可選的，另一個是強制性的。需要將它們組合起來，以便我可以將單個代碼交替用于強制性條件和其他可選條件

有沒有辦法將它們組合起來，這樣我就沒有多余的代碼？

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',
    },
  });

＃選修的

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',
    },
  });

我嘗試以這種方式組合，但沒有運氣

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;

uj5u.com熱心網友回復：

您可以創建驗證器工廠來創建通用驗證規則。

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'));

測驗案例1：沒有convertedUrlId資料。

 ?  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%  

測驗用例2：有convertedUrlId資料。

?  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%

uj5u.com熱心網友回復：

這對我有用

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();

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