如何在 Joi 中添加自定义验证器功能？

Question

我有 Joi 模式，想添加一个自定义验证器来验证默认的 Joi 验证器无法实现的数据。

目前我使用的是Joi的16.1.7版本

   const method = (value, helpers) => {
      // for example if the username value is (something) then it will throw an error with flowing message but it throws an error inside (value) object without error message. It should throw error inside the (error) object with a proper error message

      if (value === "something") {
        return new Error("something is not allowed as username");
      }

      // Return the value unchanged
      return value;
    };

    const createProfileSchema = Joi.object().keys({
      username: Joi.string()
        .required()
        .trim()
        .empty()
        .min(5)
        .max(20)
        .lowercase()
        .custom(method, "custom validation")
    });

    const { error,value } = createProfileSchema.validate({ username: "something" });

    console.log(value); // returns {username: Error}
    console.log(error); // returns undefined

但我无法以正确的方式实现它。我阅读了 Joi 文档，但对我来说似乎有点困惑。谁能帮我解决一下？

Answer 1

您的自定义方法必须是这样的：

const method = (value, helpers) => {
  // for example if the username value is (something) then it will throw an error with flowing message but it throws an error inside (value) object without error message. It should throw error inside the (error) object with a proper error message

  if (value === "something") {
    return helpers.error("any.invalid");
  }

  // Return the value unchanged
  return value;
};

文档：

https://github.com/hapijs/joi/blob/master/API.md#anycustommethod-description

输出值：

{ username: 'something' }

错误输出：

[Error [ValidationError]: "username" contains an invalid value] {
  _original: { username: 'something' },
  details: [
    {
      message: '"username" contains an invalid value',
      path: [Array],
      type: 'any.invalid',
      context: [Object]
    }
  ]
}

Answer 2

const Joi = require('@hapi/joi');

Joi.object({
    password: Joi
        .string()
        .custom((value, helper) => {

            if (value.length < 8) {
                return helper.message("Password must be at least 8 characters long")

            } else {
                return true
            }

        })

}).validate({
    password: '1234'
});

Answer 3

这就是我验证代码的方式，看看它并尝试格式化你的代码

const busInput = (req) => {
  const schema = Joi.object().keys({
    routId: Joi.number().integer().required().min(1)
      .max(150),
    bus_plate: Joi.string().required().min(5),
    currentLocation: Joi.string().required().custom((value, helper) => {
      const coordinates = req.body.currentLocation.split(',');
      const lat = coordinates[0].trim();
      const long = coordinates[1].trim();
      const valRegex = /-?\d/;
      if (!valRegex.test(lat)) {
        return helper.message('Laltitude must be numbers');
      }
      if (!valRegex.test(long)) {
        return helper.message('Longitude must be numbers');
      }
    }),
    bus_status: Joi.string().required().valid('active', 'inactive'),
  });
  return schema.validate(req.body);
};

如何在 Joi 中添加自定义验证器功能？

How to add custom validator function in Joi?

javascript

validation

node.js

express

joi