sen-material: progs/ap3.js@ddcc4ef4f82c (annotated)

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progs/ap3.js

author	Christian Urban <christian dot urban at kcl dot ac dot uk>
	Wed, 26 Oct 2016 01:03:33 +0100
changeset 484	ddcc4ef4f82c
parent 166	bba0504abcf0
child 531	35ffb7a7eafa
permissions	-rw-r--r--

updated

166 bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	1	function mk_hash(s) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	2	return crypto.createHash('sha1').update(s).digest('hex')
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	3	}
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	4
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	5	function mk_cookie(c) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	6	return c.toString() + "-" + mk_hash(c.toString())
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	7	}
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	8
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	9	function gt_cookie(s) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	10	var splits = s.split("-", 2);
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	11	var counter = parseInt(splits[0])
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	12	if (mk_hash(counter.toString()) == splits[1]) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	13	return counter
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	14	} else { return 0 }
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	15	}
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	16
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	17	app.get('/', function(req, res){
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	18	var counter = gt_cookie(req.cookies.counter) \|\| 0;
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	19	res.cookie('counter', mk_cookie(counter + 1));
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	20	...
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	21	});
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	22

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