lime-router

About

This is a simple router for the limerun Project.

It routes HTTP and COAP requests, with simple uri templates and parameter/query string parsing.

NPM Package

This repository contains a Node Package Manager (NPM) package with a single factory constructor for the routing engine. It is intended for use in Node applications that either run on an web server that conforms to the OWIN-JS specification or run using the OWIN-JS/owin-js HTTP or COAP bridges for use with node http or node-coap respectively.

Usage

Installation:

npm install lime-router

Hello World (using RazorView):

// Dependencies
const lime = require('limerun')
    , router = require('limerouter')
    , http = require('http');
 
// Create Factories
var app = new lime.app(); 
var route = router();
 
// App
app.use(route);
route.get('/', function(){
          console.log("GET: " +this.request.path);
          return  razor.renderViewAsync('index.js.html', this);
          });
http.createServer(app.buildHttp()).listen(8000);

Methods

• route.get: Match GET requests
• route.post: Match POST requests
• route.put: Match PUT requests
• route.head: Match HEAD requests
• route.del: Match DELETE requests
• route.options: Match OPTIONS requests
• route.all: Match all above request methods.
• route.debugget: Match GET for scheme='debug' requests

API

If you want to grab a part of the path you can use capture groups in the pattern:

route.get('/id/{customer}', function() {
    var base = this.Params.base; // ex: if the path is /id/bar, then customer = bar

Query paramaters in the url are also added to owin.Params:

route.get('/id/{customer}', function() {
    var base = this.Params.base; // ex: if the path is /id/bar?name=dog, then customer = bar
    var name = this.Params.name; // ex: if the path is /id/bar?name=dog, then name = dog
});

The capture patterns matches until the next / or character present after the group

route.get('/{x}x{y}', function() {
    // if the path was /200x200, then his.Params = {x:'200', y:'200'}
});

Optional patterns are supported by adding a ? at the end

route.get('/{prefix}?/{top}', function() {
    // matches both '/a/b' and '/b'
});

If you want to just match everything you can use a wildcard * which works like posix wildcards

route.get('/{prefix}/*', function() {
    // matches both '/a/', '/a/b', 'a/b/c' and so on.
    // the value of the wildcard is available through req.params.wildcard
});

If the standard capture groups aren't expressive enough for you can specify an optional inline regex

route.get('/{digits}([0-9]+)', function() {
    // matches both '/24' and '/424' but not '/abefest' and so on.
});

You can also use regular expressions and the related capture groups instead:

route.get(/^\/foo\/(\w+)/, function(req, res) {
    var group = req.params[1]; // if path is /foo/bar, then group is bar
});

Error handling

By default lime-router will simply move to next lime middleware function if no route matched. The router is a Promise/A compatible async function that respects error bubbling, but has no specific handling built in.

You can provide a catch-all to a given route that is called if no route was matched:

route.get(function() {
// called if no other get route matched
this.response.writeHead(404);
this.response.end('no GET handler found');
});

Credits

This router was ported from gett/router which was developed under MIT license by Mathias Buus Madsen and Ian Jorgensen.

It has been developed to be a core component of the limerun OWIN-JS ecosystem.