24

今天，我试图弄清楚如何在应用程序的后端（NestJS）中验证注册表单。我只是想知道是否存在一种验证password和passwordConfirm匹配的方法，使用class-validator包来构建自定义验证器或利用提供的验证器。我正在考虑一个类验证器，而不是一个字段。

// Maybe validator here
export class SignUpDto {
    @IsString()
    @MinLength(4)
    @MaxLength(20)
    username: string;

    @IsString()
    @MinLength(4)
    @MaxLength(20)
    @Matches(/((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$/, {message: 'password too weak'})
    password: string;

    @IsString()
    @MinLength(4)
    @MaxLength(20)
    passwordConfirm: string;
}

你有什么建议？

4

6 回答 6

37

最后，由于@ChristopheGeers在我的问题评论中的建议，我设法解决了密码匹配问题：

@piero：如前所述，尚不支持。但这里有一个示例装饰器 (@IsLongerThan)：LINK .... 它检查一个属性是否比另一个长。因此，可以将一个属性与另一个属性进行比较。你可以使用这个例子来创建一个装饰器来做你想做的事。

这是我提出的解决方案：

注册.dto.ts

export class SignUpDto {
    @IsString()
    @MinLength(4)
    @MaxLength(20)
    username: string;

    @IsString()
    @MinLength(4)
    @MaxLength(20)
    @Matches(/((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$/, {message: 'password too weak'})
    password: string;

    @IsString()
    @MinLength(4)
    @MaxLength(20)
    @Match('password')
    passwordConfirm: string;
}

match.decorator.ts

import {registerDecorator, ValidationArguments, ValidationOptions, ValidatorConstraint, ValidatorConstraintInterface} from 'class-validator';

export function Match(property: string, validationOptions?: ValidationOptions) {
    return (object: any, propertyName: string) => {
        registerDecorator({
            target: object.constructor,
            propertyName,
            options: validationOptions,
            constraints: [property],
            validator: MatchConstraint,
        });
    };
}

@ValidatorConstraint({name: 'Match'})
export class MatchConstraint implements ValidatorConstraintInterface {

    validate(value: any, args: ValidationArguments) {
        const [relatedPropertyName] = args.constraints;
        const relatedValue = (args.object as any)[relatedPropertyName];
        return value === relatedValue;
    }

}
于 2020-03-31T15:18:38.140 回答
8

这是一个扩展示例，它内联验证器并为其提供默认消息。这样您就不必每次使用@IsEqualTo装饰器时都输入消息。

import { 
    registerDecorator, 
    ValidationArguments, 
    ValidationOptions 
} from 'class-validator';

export function IsEqualTo(property: string, validationOptions?: ValidationOptions) {
    return (object: any, propertyName: string) => {
      registerDecorator({
        name: 'isEqualTo',
        target: object.constructor,
        propertyName,
        constraints: [property],
        options: validationOptions,
        validator: {
          validate(value: any, args: ValidationArguments) {
          const [relatedPropertyName] = args.constraints;
          const relatedValue = (args.object as any)[relatedPropertyName];
          return value === relatedValue;
        },

        defaultMessage(args: ValidationArguments) {
          const [relatedPropertyName] = args.constraints;
          return `${propertyName} must match ${relatedPropertyName} exactly`;
        },
      },
    });
  };
}
于 2020-04-13T07:20:12.603 回答
2

接受的答案对我来说非常好，但我们可能会犯拼写错误，例如：

@Match('passwordd')
//

所以我想让它更严格Generics

@Match(SignUpDto, (s) => s.password)

match.decorator.ts

import { ClassConstructor } from "class-transformer";

export const Match = <T>(
  type: ClassConstructor<T>,
  property: (o: T) => any,
  validationOptions?: ValidationOptions,
) => {
  return (object: any, propertyName: string) => {
    registerDecorator({
      target: object.constructor,
      propertyName,
      options: validationOptions,
      constraints: [property],
      validator: MatchConstraint,
    });
  };
};

@ValidatorConstraint({ name: "Match" })
export class MatchConstraint implements ValidatorConstraintInterface {
  validate(value: any, args: ValidationArguments) {
    const [fn] = args.constraints;
    return fn(args.object) === value;
  }

  defaultMessage(args: ValidationArguments) {
    const [constraintProperty]: (() => any)[] = args.constraints;
    return `${constraintProperty} and ${args.property} does not match`;
  }
}

所以我们可以Match像这样使用装饰器：

export class SignUpDto {
  // ...
  password: string;

  // finally, we have 
  @Match(SignUpDto, (s) => s.password)
  passwordConfirm: string;
}
于 2021-07-28T15:29:40.380 回答
2

我喜欢 IsEqualTo 装饰器的方法，但我也担心使用不在我的 Dto 中的属性时的拼写错误，所以我最终得到了这个：

import {
  registerDecorator,
  ValidationArguments,
  ValidationOptions,
} from 'class-validator';

export function IsEqualTo<T>(
  property: keyof T,
  validationOptions?: ValidationOptions,
) {
  return (object: any, propertyName: string) => {
    registerDecorator({
      name: 'isEqualTo',
      target: object.constructor,
      propertyName,
      constraints: [property],
      options: validationOptions,
      validator: {
        validate(value: any, args: ValidationArguments) {
          const [relatedPropertyName] = args.constraints;
          const relatedValue = (args.object as any)[relatedPropertyName];
          return value === relatedValue;
        },

        defaultMessage(args: ValidationArguments) {
          const [relatedPropertyName] = args.constraints;
          return `${propertyName} must match ${relatedPropertyName} exactly`;
        },
      },
    });
  };
}

并像这样使用它：

export class CreateUserDto {
  @IsEqualTo<CreateUserDto>('password')
  readonly password_confirmation: string;
}
于 2021-09-08T19:18:51.460 回答
0 
@MinLength(requiredlength ex: 5)
 @MaxLength(requiredlength ex:5)

正在使用最新版本，因此我们可以使用它来验证长度。

于 2021-06-25T09:03:30.453 回答
0

我喜欢接受的答案，但我认为我们可以通过将要验证的属性作为约束数组中的字符串传递来简化流程。

例子 ：

@ValidatorConstraint({ name: 'CustomMatchPasswords', async: false })
export class CustomMatchPasswords implements ValidatorConstraintInterface {
   validate(password: string, args: ValidationArguments) {

      if (password !== (args.object as any)[args.constraints[0]]) return false;
      return true;
   }

   defaultMessage(args: ValidationArguments) {
      return "Passwords do not match!";
   }
}

然后我们可以使用验证器而无需创建装饰器：

    @IsString()
    @MinLength(4)
    @MaxLength(20)
    @Matches(/((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$/, {message: 'password too weak'})
    password: string;

    @IsString()
    @MinLength(4)
    @MaxLength(20)
    @Validate(CustomMatchPasswords, ['password'])
    passwordConfirm: string;
于 2021-09-16T20:00:30.240 回答