A request parser that enforces REST style for any db model. Simply implement the required methods for the underlying object. The model object only needs to implement the methods .post, .get, .put, and .delete.
We want to separate the request and authentication handlers from the database model code. This makes it easy to change backends without having to change your http routes. It's also great for exposing the same API over http for all of your database models without extra code.
This module is installed via npm:
$ npm install rest-parserExample database connection object that uses simple in-memory dictionaries for application storage.
function Book(key) {
this.db = {}
this.key = key
}
Book.prototype.post = function (data, opts, cb) {
if(!data) {
return cb('Need values to save')
}
var key = data[this.key]
this.db[key] = data
return cb(null, key)
}
Book.prototype.get = function (opts, cb){
if(!opts.id) {
var values = []
for (id in this.db) {
values.push(this.db[id])
}
return cb(null, values)
}
var val = this.db[opts.id]
if (!val) {
return cb('NotFound')
}
return cb(null, this.db[opts.id])
}
Book.prototype.put = function (data, opts, cb) {
if(!opts.id) {
return cb('Need a opts.id')
}
this.db[opts.id] = data
return cb(null, opts.id)
}
Book.prototype.delete = function (opts, cb) {
if(!opts.id) {
return cb('Need a opts.id')
}
delete this.db[opts.id]
return cb(null)
}var RestParser = require('rest-parser')
var Book = require('./book.js')
// make the book model
var bookDB = new Book()
var REST = new RestParser(bookDB)
// Wire up API endpoints
router.addRoute('/api/book/:id?', function(req, res, opts) {
var id = parseInt(opts.params.id) || opts.params.id
REST.dispatch(req, { id: id }, function (err, data) {
res.end(JSON.stringify(data))
})
})
})
var server = http.createServer(router)
server.listen(8000)The server will now have these routes available:
GET /book
GET /book/:id
POST /book
PUT /book/:id
DELETE /book/:id
Sometimes, you want control over the individual routes to expose only a subset, to require authentication, or some other query logic. It's easy to do with rest-parser -- just use the underlying handler methods:
var RestParser = require('rest-parser')
var Book = require('./book.js')
// make the book model
var bookDB = new Book()
var REST = new RestParser(book)
// Wire up API endpoints
router.addRoute({
GET: '/api/book/:id', function(req, res, opts) {
var id = parseInt(opts.params.id) || opts.params.id
REST.get(req, { id: id }, function (err, data) {
res.end(JSON.stringify(data))
})
}),
POST: '/api/book/:id', function(req, res, opts) {
var id = parseInt(opts.params.id) || opts.params.id
if (!req.userid) {
res.statusCode = 401
res.end('Unauthorized!')
return
}
REST.post(req, { id: id }, function (err, data) {
res.end(JSON.stringify(data))
})
})
})
var server = http.createServer(router)
server.listen(8000)Instantiates the parser with a given model.
The model object should have the following method signature:
- model#put(data, opts, cb)
- model#post(data, opts, cb)
- model#delete(opts, cb)
- model#get(opts, cb)
The parser will take the request object and route to the corresponding model method.
Does not enforce an id -- it is assumed that the id will be generated upon creation or otherwise will be handled by the model.
Parses the request body using getBodyData and passes to model.put.
Passes to model.delete.
Passes to model.get
This parses the req.method to dispatch appropriately to one of the above methods.
Create a new book
$ curl -x POST 'http://localhost:8000/api/book' -d {'author': 'Mark Twain', 'name': 'N/A'}
1Update a book
$ curl -x PUT 'http://localhost:8000/api/book/1' -d {'author': 'Mark Twain', 'name': 'Life on the Mississippi'}
1Get all books
$ curl 'http://localhost:8000/api/book'
[
{
'id': 1,
'author': 'Mark Twain',
'name': 'Life on the Mississippi'
},
etc...
]Get a single book
$ curl 'http://localhost:8000/api/book/1'
{
'id': 1,
'author': 'Mark Twain',
'name': 'Life on the Mississippi'
}Delete a book
$ curl -x DELETE 'http://localhost:8000/api/book/1'Get all books (none remain)
$ curl 'http://localhost:8000/api/book'
[]Copyright (c) 2014, Karissa McKelvey All rights reserved.
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