sen-material: progs/ap4.js@47e06cb75837 (annotated)

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progs/ap4.js

author	Christian Urban <christian dot urban at kcl dot ac dot uk>
	Thu, 06 Nov 2014 12:32:05 +0000
changeset 286	47e06cb75837
parent 166	bba0504abcf0
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	var salt = 'secret key'
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	2
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	3	function mk_hash(s) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	4	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	5	}
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	6
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	7	function mk_cookie(c) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	8	return c.toString() + '-' + mk_hash(c.toString() + salt)
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	9	}
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	10
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	11	function gt_cookie(s) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	12	var splits = s.split("-", 2);
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	13	var counter = parseInt(splits[0])
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	14	var hash = splits[1]
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	15	if (mk_hash(counter.toString() + salt) == hash) {
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	16	return counter
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	17	} else { return 0 }
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	18	}
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	19
bba0504abcf0 added js snippets Christian Urban <christian dot urban at kcl dot ac dot uk> parents: diff changeset	20	app.get('/', function(req, res){ .... });

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