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# egg-define-router

Painless router definition for [eggjs](https://eggjs.org).

## Install

```sh
$ npm i egg-define-router
```

## Usage

`egg-define-router` is used to define eggjs routers.

If we have an egg project with the following classic directory structure:

```
egg-project
|-- app
|   |-- router.js
|   |-- controller
|   |   |-- foo.js
|   |-- middleware
|   |   |-- custom
|   |   |   |-- clean.js
|   |-- ...
|-- ...
```

And in router.js:

```js
const defineRouter = require('egg-define-router')
const path = require('path')

module.exports = defineRouter({
  // Equivalent to `'GET /foo/bar': 'foo.bar'`
  // -> app.router.get('/foo/bar', app.controller.foo.bar)
  '/foo/bar': 'foo.bar',
  'POST /foo/bar': 'foo.bar',
  'PUT /foo/baz': ['clean', 'foo.baz']
}, {
  middlewareRoot: path.join(__dirname, 'middleware', 'custom')
})
```

#### Config a basic router of GET method

If we have the following `routes` definition:

```js
{
  // If there is no method specified,
  // the method type defaults to `GET`
  '/foo/bar': 'foo.bar',
  'POST /foo/bar': 'foo.bar'
}
```

which is equivalent to:

```js
app.router.get('/foo/bar', app.controller.foo.bar)
app.router.post('/foo/bar', app.controller.foo.bar)
```

#### With custom middlewares

```js
{
  'PUT /foo/baz': [
    // `clean` is the middleware name
    'clean',
    'foo.baz'
  ]
}
```

Which is equivalent to:

```js
app.router.put(
  '/foo/baz',
  require(`${middlewareRoot}/clean`),
  app.controller.foo.baz
)
```

#### Directly define middleware/controller functions

```js
{
  'DELETE /user': async ctx => {
    await deleteUser(ctx.params.id)
    ctx.body = 'deleted'
  },

  'PUT /comment': [
    preventXSSMiddleware,
    'comment.create'
  ]
}
```

## defineRouter(routes, {middlewareRoot})

- **routes** `Routes`
- **middlewareRoot** `path` The search path for middleware name.

Creates the router function which accept one argument `app`.

### `routes`

The complete definition of `routes` lists below.

```ts
type KoaFunc = (ctx: KoaContext, next?: KoaNext) => any
type ControllerName = string
type MiddlewareName = string

type Controller = ControllerName | KoaFunc
type Middleware = MiddlewareName | KoaFunc

type RouteDefinition = Controller
  | [...Array<Middleware>, Controller]

interface Routes {
  [methodAndPathname: string]: RouteDefinition
}
```

Here is an example for better understanding:

```js
routes: {
  'pathname': controllerFunction,
  'METHOD pathname': 'controllerName',
  'GET pathname': [
    'middlewarename',
    middlewareFunction,
    ...,
    'controllerName'
  ],
  'DELETE pathname': [
    'middlewarename',
    middlewareFunction,
    ...,
    controllerFunction
  ],
}
```

## License

MIT