director-reflector

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director-reflector

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reflect isomorphic HTTP client API wrappers from Director routers

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# Director-Reflector

Reflects [request](https://github.com/mikeal/request) based HTTP client API wrappers from [Director](http://github.com/flatiron/director) routers. Requires **no** additional configuration and is compatible with any existing `Director.Router` instance.

# Explanation

Director-Reflector removes the process of writing boilerplate client code for communicating with HTTP [Director](http://github.com/flatiron/director) routers. Director-Reflector uses <a href="http://en.wikipedia.org/wiki/Reflection_(computer_programming)">reflection</a> to reflect an API client which maps all remote routes to a local object.

Through the removal of writing boilerplate HTTP API client REST mappings for remote [Director](http://github.com/flatiron/director) routers, Director-Reflector creates a robust, standardized, and re-usable HTTP API client.

**Note**: Director-Reflector makes the least amount of assumptions possible about your application. The API client wrapper it reflects is designed to be **as minimalistic as possible**. The default client will cover **all** routes in any Director routing map out of the box, but you are encouraged to extend the reflected base client with your own personal sugar-syntax.

## Default API Client Mappings

**If only one verb is bound to the route, the route name becomes the method name.**

```
router.get('/foo')                          =>  client.foo()
router.post('/bar')                         =>  client.bar()
```

**If multiple verbs are bound to the route, each verb becomes a method with a restful name.**

```
router.get('/moo')                          =>  client.moo.get()
router.post('/moo')                         =>  client.moo.create()
router.delete('/moo')                       =>  client.moo.destroy()
router.put('/moo')                          =>  client.moo.save()
```

**If route parameters are used ( such as an id ), they become the last method's first argument.**

```
router.post('/albums/:albumid')             =>  client.albums.create('ill-communication', { artist: "beastie boys" })
router.get('/albums/:albumid')              =>  client.albums.get('ill-communication')
```

**If multiple route parameters are used, the parameters curry as arguments in the last method from left-to-right.**

```
router.post('/albums/:albumid/songs/:id')   =>  client.albums.songs.create('ill-communication', 'root-down', data)
router.get('/albums/:albumid/songs/:id')    =>  client.albums.songs.get('ill-communication', 'root-down')
```

**Nested routing scopes follow the same rules.**

```
router.path('/users', function(){             
 this.path('/:id', function(){               
   this.post(n);                           => client.users.create('bob', data)
   this.get(n);                            => client.users.get('bob')
   this.delete(n);                         => client.users.destroy('bob')
   this.put(n);                            => client.users.save('bob', data)
   this.path('/dongles/:id', function(){
     this.post(n);                         => client.users.dongles.create('bob', 'the-dongle', data)
     this.get(n);                          => client.users.dongles('bob', 'the-dongle');
 })
});
```

# Installation

npm install director-reflector

# Usage

### Creating a Director router

```js

var director = require('director'),
    router   = new director.http.Router();

router.get('/foo', function(){
  this.res.end('hello');
});

```
### Creating a new API client from a Director router

```js

var dr = require('director-reflector'),

var client = dr.createClient(router);

client.foo(function(err, res, body){
  console.log(body);
})
```

### Making your Director router portable

In most cases, it's *not* going to be feasible to expose the entire Router instance to the client.

Have no fear! [Director](http://github.com/flatiron/director) routing maps can safety be serialized without exposing any protected logic.

**Run the following code to export a portable ( and safe ) routing map as JSON:**

```js
var str    = dr.toJSON(router);

// Somewhere else, where `router` instance is not available
dr.createClient(JSON.parse(str));

```

Here is an example of [an exported routing map](https://github.com/flatiron/director-reflector/blob/master/examples/exported-router.json).

# TODO

- Add ability for built-in authorization strategies. 
 - Add `nconf` based config management
 - Add more tests

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