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@ibaaj ibaaj/pageMonitor.js
Last active Aug 29, 2015

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Page Monitor NodeJS - usage: node pageMonitor.js http://url.com/ 300
var http = require('http');
var url = require("url");
var crypto = require('crypto');
if(process.argv.length != 4)
{
console.log('Syntax ::');
console.log('node pagemonitor.js http://my-url-to-monitor.com 300');
console.log('with 300 the interval check (in seconds (300s = 5min)).');
process.exit(1);
}
var urlInput = process.argv[2], interval = parseInt(process.argv[3]);
var urlRegex = new RegExp(/[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi);
if (!urlInput.match(urlRegex))
{
console.log("this:" + url + " is not a url");
process.exit(1);
}
var urlParts = url.parse(urlInput, true);
if(isNaN(interval))
{
console.log(process.argv[3] + " is not a number.");
process.exit(1);
}
var firstDate, firstMd5;
var changementAlert = function(){
console.log("CHANGEMENT");
console.log('\u0007');
process.exit(0);
};
var intervalCheck = function(){
var optionsSec = { method: 'GET', host: urlParts.host, port: urlParts.port, path: urlParts.path };
var requestSec = http.request(optionsSec, function(res) {
var data = '';
if(Date.parse(res.headers["last-modified"]) != firstDate)
changementAlert();
res.on('data', function(chunk) {
data += chunk.toString();
});
res.on('end', function(){
if(crypto.createHash('md5').update(data).digest('hex') != firstMd5)
changementAlert();
});
}
).end();
};
var options = { method: 'GET', host: urlParts.host, port: urlParts.port, path: urlParts.path };
var req = http.request(options, function(res) {
firstDate = Date.parse(res.headers["last-modified"]);
var data = '';
res.on('data', function(chunk) {
data += chunk.toString();
});
res.on('end', function(){
firstMd5 = crypto.createHash('md5').update(data).digest('hex');
});
}
);
req.on('finish', function(){
setInterval(intervalCheck, interval);
});
req.end();
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