AdventCalendarのスクショを自動的に取ってくるやつ

capture.js

var fs = require("fs");
var page = require("webpage").create();
page.open("http://www.adventar.org/calendars/1183", function(){
	page.clipRect = page.evaluate(function(){
		return document.querySelector(".mod-calendar").getBoundingClientRect();
	});
	fs.remove("calendar.png");
	page.render("calendar.png");
	phantom.exit();
});

index.php

<?php
	if(@file_get_contents("time.log")+3600 < time()){
		file_put_contents("time.log", time(), LOCK_EX);
		system("phantomjs capture.js > /dev/null &");
	}
	header("Content-Type: image/png");
	echo(@file_get_contents("calendar.png"));
?>