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app.js
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app.js
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/*******************************************************
* big-todo
* JSON objects implementation (server)
* January 2015
* Mike Amundsen (@mamund)
* Soundtrack : Keith Jarrett Charlie Haden "Last Dance"
*******************************************************/
// base modules
var http = require('http');
var querystring = require('querystring');
/// internal modules
var representation = require('./representation.js');
// connector modules
var home = require('./connectors/home.js');
var task = require('./connectors/task.js');
var user = require('./connectors/user.js');
var category = require('./connectors/category.js');
var utils = require('./connectors/utils.js');
// shared vars
var root = '';
var port = (process.env.PORT || 8282);
var prodType = 'application/json';
var testType = 'application/json';
var haljType = 'application/hal+json';
var htmlType = "text/html";
var csType = '';
var csAccept = '';
// routing rules
var reHome = new RegExp('^\/$','i');
var reCategory = new RegExp('^\/category\/.*','i');
var reFile = new RegExp('^\/files\/.*','i');
var reTask = new RegExp('^\/task\/.*','i');
var reUser = new RegExp('^\/user\/.*','i');
// request handler
function handler(req, res) {
var segments, i, x, parts, rtn, flg, doc, url;
// set local vars
root = '//'+req.headers.host;
csType = testType;
flg = false;
file = false;
doc = null;
// rudimentary accept-header handling
csAccept = req.headers["accept"];
if(!csAccept || csAccept.indexOf(htmlType)!==-1) {
csType = htmlType;
}
else {
csType = csAccept.split(',')[0];
}
// hack responses
csType = haljType;
// parse incoming request URL
parts = [];
segments = req.url.split('/');
for(i=0, x=segments.length; i<x; i++) {
if(segments[i]!=='') {
parts.push(segments[i]);
}
}
// handle options call
if(req.method==="OPTIONS") {
sendResponse(req, res, "", 200);
return;
}
// home handler
if(reHome.test(req.url)) {
flg = true;
doc = home(req, res, parts, handleResponse);
}
// category handler
if(flg===false && reCategory.test(req.url)) {
flg = true;
category(req, res, parts, handleResponse);
}
// task handler
if(flg===false && reTask.test(req.url)) {
flg = true;
task(req, res, parts, handleResponse);
}
// user handler
if(flg===false && reUser.test(req.url)) {
flg = true;
user(req, res, parts, handleResponse);
}
// file handler
try {
if(flg===false && reFile.test(req.url)) {
flg = true;
utils.file(req, res, parts, handleResponse);
}
}
catch(ex) {}
// final error
if(flg===false) {
handleResponse(req, res, utils.errorResponse(req, res, 'Not Found', 404));
}
}
// handle response work
function handleResponse(req, res, doc) {
var rtn;
if(doc!==null) {
if(doc.file===true) {
rtn = doc.doc;
}
else {
rtn = representation(doc.doc, csType, root);
}
sendResponse(req, res, rtn, doc.code, doc.headers);
}
else {
sendResponse(req, res, 'Server Response Error', 500);
}
}
function sendResponse(req, res, body, code, headers) {
var hdrs;
if(headers && headers!==null) {
hdrs = headers;
}
else {
hdrs = {}
}
if(!hdrs['content-type']) {
hdrs['content-type'] = csType;
}
// always add CORS headers to support external clients
hdrs["Access-Control-Allow-Origin"] = "*";
hdrs["Access-Control-Allow-Methods"] = "POST, GET, PUT, DELETE, OPTIONS";
hdrs["Access-Control-Allow-Credentials"] = true;
hdrs["Access-Control-Max-Age"] = '86400'; // 24 hours
hdrs["Access-Control-Allow-Headers"] = "X-Requested-With, Access-Control-Allow-Origin, X-HTTP-Method-Override, Content-Type, Authorization, Accept";
res.writeHead(code, hdrs),
res.end(body);
}
// wait for request
http.createServer(handler).listen(port);
console.log('listening on port '+port);