Nest.js 管道

Docs: https://docs.nestjs.com/pipes

管道将输入数据转换为所需的输出。此外，它可以处理验证，当数据不正确时可能会抛出异常。

内置的 pipe

import { ArgumentMetadata, Injectable, PipeTransform, BadRequestException } from '@nestjs/common';

@Injectable()
export class InfoPipe implements PipeTransform {
  async transform(value: any, metadata: ArgumentMetadata) {
    if(!(value.name && value.age)){
      throw new BadRequestException('发送语义有误')
    }
    return value;
  }
}

  // 使用pipe
  @Get()
  @UsePipes(new InfoPipe())
  root(@Query() info) {
    return `hello world`
  }

Joi库 https://github.com/hapijs/joi

import { ArgumentMetadata, Injectable, PipeTransform, BadRequestException } from '@nestjs/common';
import * as Joi from 'joi'

@Injectable()
export class InfoPipe implements PipeTransform {

  constructor(private readonly schema) { }

  async transform(value: any, metadata: ArgumentMetadata) {
    console.log(value);

    const { error } = Joi.validate(value, this.schema)
    if (error) {
      throw new BadRequestException('发送语义有误')
    }
    return value;
  }
}

import * as Joi from 'joi'

let rootInfo = Joi.object().keys({
  name: Joi.string().required(),
  age: Joi.number().integer().min(6).max(66).required(),
})

  @Get()
  @UsePipes(new InfoPipe(rootInfo))
  root(@Query() info) {
    return `hello world`
  }