koa-swagger-decorator

using decorator to auto generate swagger json docs

Installation

npm install koa-swagger-decorator

Introduction

Koa Swagger Decorator

using decorator to auto generate swagger json docs add support validation for swagger definitions

based on Swagger OpenAPI Specification 2.0

support both javascript (babel required) and typescript

Example

// using commonds below to start and test the example server

git clone https://github.com/Cody2333/koa-swagger-decorator.git

cd koa-swagger-decorator

npm install

npm run start

finally open:
http://localhost:3000/api/swagger-html

Requirements

Koa2
koa-router
babel support for decorator (or using typescript)

// add [transform-decorators-legacy] to .babelrc if using js

npm install --save-dev babel-plugin-transform-decorators-legacy

{
  "presets": [
    ["env", {"targets": {"node": "current"}}]
  ],
  "plugins": ["transform-decorators-legacy"]
}

Detail

for more detail please take a look at the example koa server

first wrapper the koa-router object

// router.js
import Router from 'koa-router'

import Test from './test'

import { SwaggerRouter } from 'koa-swagger-decorator'

const router = new SwaggerRouter() // extends from koa-router

// swagger docs avaliable at http://localhost:3000/api/swagger-html
router.swagger({
  title: 'Example Server',
  description: 'API DOC',
  version: '1.0.0',

  // [optional] default is root path.
  // if you are using koa-swagger-decorator within nested router, using this param to let swagger know your current router point
  prefix: '/api',

  // [optional] default is /swagger-html
  swaggerHtmlEndpoint: '/swagger-html',

  // [optional] default is /swagger-json
  swaggerJsonEndpoint: '/swagger-json',

  // [optional] additional options for building swagger doc
  // eg. add api_key as shown below
  swaggerOptions: {
    securityDefinitions: {
      api_key: {
        type: 'apiKey',
        in: 'header',
        name: 'api_key',
      },
    },
  },
})
// map all static methods at Test class for router
// router.map(Test);

// mapDir will scan the input dir, and automatically call router.map to all Router Class
router.mapDir(_path.resolve(__dirname), {
  // default: true. To recursively scan the dir to make router. If false, will not scan subroutes dir
  // recursive: true,
  // default: true, if true, you can call ctx.validatedBody[Query|Params] to get validated data.
  // doValidation: true,
})

using decorator to make api definition

// test.js

import User from 'models/user'
import { request, summary, query, path, body, tags } from 'koa-swagger-decorator'

const testTag = tags(['test'])

const userSchema = {
  name: { type: 'string', required: true },
  gender: { type: 'string', required: false, example: 'male' },
  groups: {
    type: 'array',
    required: true,
    items: { type: 'string', example: 'group1' }, // item's type will also be validated
  },
}

export default class Test {
  @request('get', '/users')
  @summary('get user list')
  @testTag
  @query({
    type: { type: 'number', required: true, default: 1, description: 'type' },
  })
  static async getUsers(ctx) {
    const users = await User.findAll()
    ctx.body = { users }
  }

  @request('get', '/users/{id}')
  @summary('get user info by id')
  @testTag
  @path({
    id: { type: 'number', required: true, default: 1, description: 'id' },
  })
  static async getUser(ctx) {
    const { id } = ctx.validatedParams
    const user = await User.findById(id)
    ctx.body = { user }
  }

  @request('post', '/users')
  @testTag
  @body(userSchema)
  static async postUser(ctx) {
    // const body = ctx.request.body;
    const body = ctx.validatedBody
    ctx.body = { result: body }
  }

  static async temp(ctx) {
    ctx.body = { result: 'success' }
  }
}

avaliable annotations

tags
query
path
body
formData
middlewares
summary
description
responses
deprecated

class annotations

tagsAll
responsesAll
middlewaresAll
deprecatedAll
queryAll

request // @request('POST', '/users')

tags // @tags(['example'])
query // @query({limit: {type: 'number', required: true, default: 10, description: 'desc'}})

path // @path({limit: {type: 'number', required: true, default: 10, description: 'desc'}})

body // @body({groups: {type: 'array', required: true, items: { type: 'string', example: 'group1' }}})

formData // @formData({file: {type: 'file', required: true, description: 'file content'}})

middlewares
// support koa middlewares.
// eg. @middlewares([func1,func2])

summary // @summary('api summary')

description // @description('api description')

responses
// @responses({ 200: { description: 'success'}, 400: { description: 'error'}})
// responses is optional

deprecated // @deprecated

@tagsAll(['A', 'B'])
@deprecatedAll
@middlewaresAll([log1, log2]) // add middlewares [log1, log2] to all routers in this class
@queryAll({ limit: { type: 'number', default: 444, required: true } }) // can be merged with @query
export default class SampleRouter {
  ...
}

validation

support validation type: string, number, boolean, object, array.

properties in {type: 'object'} and items in {type: 'array'} can alse be validated.

other types eg. integer will not be validated, and will return the raw value.

by default, validation is activated and you can call ctx.validatedQuery[Body|Params] to access the validated value.

to turn off validation:

router.mapDir(_path.resolve(__dirname), {
  // default: true, if true, you can call ctx.validatedBody[Query|Params] to get validated data.
  doValidation: false,
})

lynzz / koa-swagger-decorator