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createRouter.js
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createRouter.js
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require.paths.unshift(require('path').join(__dirname, '../vendor/resourcer/lib/'));
var ws = require('./webservice'),
fs = require('fs'),
journey = require('journey'),
resourcer = require('resourcer'),
validator = require('resourcer/validator');
//
// Returns a Journey router
//
var createRouter = exports.createRouter = function createRouter( module, options ){
var template = fs.readFileSync(__dirname + '/views/home.html'),
routes = _createMetaRoutes( module );
// create a router object with an associated routing table
var router = new(journey.Router)();
router.map(function (map) {
if(options.bindroot !== false){
map.root.bind(function(res){
res.send(200, {'Content-Type': 'text/html'}, ws.view.renderRoutes('html', '', routes, template.toString()));
});
}
// returns the docs of the API
map.get('/docs').bind(function (reg, res, id) {
res.send(200, {'Content-Type': 'text/html'}, ws.view.renderRoutes('html', '', routes, template.toString()));
});
// returns the docs of the API
map.get('/docs.json').bind(function (reg, res, id) {
res.send(200, {'Content-Type': 'text/html'}, ws.view.renderRoutes('html', '', routes, JSON.stringify(routes)));
});
// returns the version of the API
map.get('/version').bind(function (reg, res, id) {
res.send(200, {'Content-Type': 'text/html'}, { version: journey.version.join('.') });
});
// extend the Journey router with our generated routes based on the module
_extendRouter(map, module, options);
}, { strict: false });
return router;
}
function _extendRouter( map, module, options ){
// iterate through each top-level method in the module and create a route for it in journey
for(var method in module){
if(typeof module[method] != 'function'){
continue;
}
var regex = new RegExp('\/' + method + '\/(.*?)'),
regexfix = new RegExp('\/' + method),
journeyHandler = _createJourneyHandler(module, method, options);
// hard-coded for one additional layer of restful methods
for(var p in module[method]){
if(typeof module[method][p] == "function"){
var a = new RegExp('\/' + method + '\/([\w|\-]+)');
map.route(a).bind(journeyHandler);
}
}
// we should only have one handler being bound, this is a regex bug
map.route(regex).bind(journeyHandler);
map.route(regexfix).bind(journeyHandler);
}
}
function _createJourneyHandler(module, method, options){
var handler = function (req, res, params) {
var args = [], method_options = {}, self = this;
for(var p in params){
if(params[p].length){
method_options[p] = params[p];
}
}
try{
var posted = JSON.parse(this.request.body);
for(var p in posted){
if(posted[p].length){
method_options[p] = posted[p];
}
}
}
catch(err){
}
// bind all createHandler options to each argument
for(var p in options){
method_options[p] = options[p];
}
module[method].request = this.request;
module[method].res = res;
args.push(method_options);
var callback = _createModuleCallback(self, res);
// push callback into arguments array
args.push(callback);
// before we attempt to fire the API method, lets see if there is any validation available
try{
// if there is no validation, fire the method regardless of arguments
if(typeof module[method].schema == 'undefined'){
// fire the method with new arguments
module[method].apply(this, args);
return;
}
// if the method is "restful" we will only perform validation on POST and PUT requests
if((module[method].restful == true && self.request.method == "GET") || self.request.method == "DELETE"){
// fire the method with new arguments
module[method].apply(this, args);
return;
}
// check if all required options were passed before executing the method
var validate = validator.validate(args[0], {
properties: module[method].schema
});
if(!validate.valid){
return callback(validate.errors);
}else{
module[method].apply(this, args);
}
}
catch(err){
// we had a run-time error, pass the error forward on the callback chain
callback(err);
}
};
return handler;
}
function _createModuleCallback( requestHandler , res ){
// callback that will be sent as argument to our module's method
return function(err, result, response){
try{
// mock out a response object
if(typeof response == 'undefined'){
var response = {};
}
// give it some defaults
response.statusCode = response.statusCode || 200;
// do some magic to determine what the Content-Type should be.
var contentType = "application/json";
if(typeof requestHandler.request.headers['content-type'] != 'undefined'){
contentType = requestHandler.request.headers['content-type'];
}
if(err){
// TODO: create error handler view
var html = '';
// let's assume it's a validator error if its an array
if(err instanceof Array){
html = ws.view.renderValidatorErrors(err);
}
else{
html = JSON.stringify(err);
}
res.send(response.statusCode, {'Content-Type': contentType}, html);
}
else{
result = result || '';
if(typeof result != 'string'){
result = JSON.stringify(result);
}
res.send(response.statusCode, {'Content-Type': contentType}, result);
}
}
catch(err){
console.log(err);
}
};
}
// create a JSON structure representing a module and its associated method names
// this is used to help with documentation generation
function _createMetaRoutes( module ){
var routes = {};
for(var method in module){
switch(typeof module[method]){
case 'function':
routes[method] = {};
try{
var f = module[method];
for(var p in f){
routes[method][p] = f[p];
}
}
catch(err){
console.log(err);
}
break;
case 'string':
routes[method] = module[method];
break;
default:
break;
}
}
if(!routes.title){
routes.title = 'Welcome to your webservice!';
}
if(!routes.name){
routes.name = 'my api';
}
if(!routes.version){
routes.version = '0.1.0';
}
if(!routes.endpoint){
routes.endpoint = 'http://localhost:8080';
}
return routes;
}