koa-decorate

koa-decorate

Provides decorators for router middleware of koa.

Install

Config

Koa-decorate is based on the decorator provided by es7,
but nodejs does not support the decorator temporarily.
so we need to use typescript to develop our application,
we can run our typescript directly through ts-node without offline compiling.

npm install --save-dev ts-node nodemon

nodemon.json

{
  "restartable": "rs",
  "ignore": [
    ".git",
    "node_modules"
  ],
  "verbose": true,
  "execMap": {
    "ts": "ts-node"
  },
  "watch": [
    "controller",
    "app.ts"
  ],
  "ext": "ts"
}

API Reference

• koa-decorate

  • Decorator ⏏

    • [new Decorator([opts])](#module_koa-decorate--Decorator_new)
    • .routes ⇒ function

  • decorator

    • http-method ⇒ @Get|@Post|@Put|@Delete|@All
    • path ⇒ @Path
    • parameter ⇒ @Param|@Query|@Body|@Ctx|@Next
    • hook ⇒ @Before|@After
  • Controller

Decorator

Kind: Exported class

new Decorator([opts])

Create a new decorated router.

Param	Type	Description
[opts]	Object
[opts.router]	Object	koa-router instance
[opts.controllers]	Object	route controller classes

Decorator.routes ⇒ function

Returns router middleware which dispatches a route matching the request.

Kind: instance property of Decorator

Example
Basic usage:

// app.ts
import Koa from 'koa';
import Router from 'koa-router';
import Decorator from 'koa-decorate';

import Controller from './controller'; // Route controller classes

const routes = new Decorator({
  router: new Router(),
  controllers: Controller
}).routes();

app.use(routes);

http-method ⇒ @Get|@Post|@Put|@Delete|@All

Create @Verb methods to match against HTTP methods, where Verb is one of the HTTP verbs
such as @Get or @Post etc.

Additionaly, @All can be used to match against all methods.

Example

// CatController.ts
import { Path, Get, Post } from 'koa-decorate';

@Path('/api/cat')
class CatController {

  @Get
  @Path('/info')
  getCatInfo () {
    return {
      id: 1,
      name: 'Lina Weiss',
      type: 'Norwegian Forest Cat'
    }
  }

  @Post
  @Path('/info/')
  CreateCat () {
    return {
      status: 200,
      data: {
        id: 2
      },
      message: 'Created successfully...'
    }
  }

}

export { CatController };

path ⇒ @Path

Match URL patterns to callback functions or controller actions using @Path,
when authFunc returns true, controller can execute logical actions, otherwise access denied.

Param	Type	Description
path	String
[authFunc]	Function => Boolean	route callback

Example

// CatController.ts
import { Path, Get } from 'koa-decorate';

@Path('/api/cat')
class CatController {

  @Get
  @Path('/info/:id', (ctx) => Number(ctx.params.id) === 1)
  getCatInfo () {
    return {
      id: 1,
      name: 'Lina Weiss',
      type: 'Norwegian Forest Cat'
    }
  }
}

export { CatController };

parameter ⇒ @Param|@Query|@Body|@Ctx|@Next

Create @Parameter decorators, where Parameter is one of the parameter-names such
as @Param, @Query, @Body etc.

Param	Type	Description
name	String

Example

// CatController.ts
import { Path, Get, Post, Param, Query, Body, Ctx } from 'koa-decorate';

@Path('/api/cat')
class CatController {

  @Get
  @Path('/info/:type')
  getCatInfo (
      @Param('type') type: string,
      @Query('info') info: string) {
    return { type, info }
  }

  @Post
  @Path('/info/:type')
  CreateCat (
      @Param('type') type: string,
      @Body('requestBody') requestBody: any) {
    return {
      status: 200,
      data: Object.assign(requestBody, { type }),
      message: 'Created successfully...'
    }
  }

}

export { CatController };

hook ⇒ @Before|@After

When the routing match is correct, the hookFunc is used to deal with
the transactions @Before and @After processing.

Param	Type	Description
[hookFunc]	Function	callback hook

Example

// CatController.ts
import { Path, Get, Param, Query, Before, After } from 'koa-decorate';

@Path('/api/cat')
class CatController {

  @Get
  @Path('/info/:type')
  @Before((ctx, next) => {
    // ...
  })
  @After((ctx, next) => {
    // ...
  })
  getCatInfo (
      @Param('type') type: string,
      @Query('info') info: string) {
    return { type, info }
  }

}

export { CatController };

Controller

Kind: The dictionary of route controller classes

Example

// Controller/index.ts
import { CatController } from './cat';

export default {
  Cat: CatController
};

Licences

MIT