koa-swagger-decorator

using decorator to auto generate swagger json docs

Installation

npm install koa-swagger-decorator

Contributing Guide

Please refer to contribution.md before creating your PR or issue.

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([KoaRouterOpts],[SwaggerOpts]) // 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',
      },
    },
  },
  // [optional] additional configuration for config how to show swagger view
  swaggerConfiguration: {
    display: {
      defaultModelsExpandDepth: 4, // The default expansion depth for models (set to -1 completely hide the models).
      defaultModelExpandDepth: 3, // The default expansion depth for the model on the model-example section.
      docExpansion: 'list', // Controls the default expansion setting for the operations and tags. 
      defaultModelRendering: 'model' // Controls how the model is shown when the API is first rendered. 
    }
  }
})
// 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,
  // default: [], paths to ignore while looking for decorators 
  // ignore: ["**.spec.ts"],
})

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')
  @security([{ api_key: [] }])
  @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')
  @security([{ api_key: [] }])
  @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' }
  }
}

using decorator to make api body

import Router from 'koa-router';
import { request, summary, query, path, body, tags, swaggerClass, swaggerProperty } from 'koa-swagger-decorator'

@swaggerClass()
export class subObject {
  @swaggerProperty({ type: "string", required: true }) Email: string = "";
  @swaggerProperty({ type: "string", required: true }) NickName: string = "";
  @swaggerProperty({ type: "string", required: true }) Password: string = "";
};

@swaggerClass()
export class userInfo {
  @swaggerProperty({ type: "string", required: true }) Email: string = "";
  @swaggerProperty({ type: "string", required: true }) NickName: string = "";
  @swaggerProperty({ type: "string", required: true }) Password: string = "";
  @swaggerProperty({type:"object",properties:(subObject as any).swaggerDocument}) UserInfo:subObject;
};

export default class Test {
  @request('POST', '/user/Register')
  @summary('register user')
  @description('example of api')
  @body((userInfo as any).swaggerDocument)
  static async Register(ctx: Router.IRouterContext) {
    var params = (ctx as any).validatedBody as userInfo;
    console.log(params);
  }
}

avaliable annotations

• tags
• query
• path
• body
• formData
• middlewares
• security
• summary
• description
• responses
• deprecated

class annotations

• tagsAll
• responsesAll
• middlewaresAll
• securityAll
• 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])

security 
// define authentication method, key must be same as one of methods defined in swaggerOptions.securityDefinitions
// @security([{ api_key: [] }]) 

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
@securityAll([{ api_key: [] }])
@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,
})

runing the project and it will generate docs through swagger ui

License

© MIT