sync/lib/utilities.js

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/*
Set prototype- simple wrapper around JS objects to
manipulate them like a set
*/
var Set = function (items) {
this._items = {};
var self = this;
if (items instanceof Array)
items.forEach(function (it) { self.add(it); });
};
Set.prototype.contains = function (what) {
return (what in this._items);
};
Set.prototype.add = function (what) {
this._items[what] = true;
};
Set.prototype.remove = function (what) {
if (what in this._items)
delete this._items[what];
};
Set.prototype.clear = function () {
this._items = {};
};
Set.prototype.forEach = function (fn) {
for (var k in this._items) {
fn(k);
}
};
module.exports = {
isValidChannelName: function (name) {
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return name.match(/^[\w-_]{1,30}$/);
},
isValidUserName: function (name) {
return name.match(/^[\w-_]{1,20}$/);
},
randomSalt: function (length) {
var chars = "abcdefgihjklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "0123456789!@#$%^&*_+=~";
var salt = [];
for(var i = 0; i < length; i++) {
salt.push(chars[parseInt(Math.random()*chars.length)]);
}
return salt.join('');
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},
maskIP: function (ip) {
if(ip.match(/^\d+\.\d+\.\d+\.\d+$/)) {
// standard 32 bit IP
return ip.replace(/\d+\.\d+\.(\d+\.\d+)/, "x.x.$1");
} else if(ip.match(/^\d+\.\d+\.\d+/)) {
// /24 range
return ip.replace(/\d+\.\d+\.(\d+)/, "x.x.$1.*");
}
},
formatTime: function (sec) {
if(sec === "--:--")
return sec;
sec = Math.floor(+sec);
var h = "", m = "", s = "";
if(sec >= 3600) {
h = "" + Math.floor(sec / 3600);
if(h.length < 2)
h = "0" + h;
sec %= 3600;
}
m = "" + Math.floor(sec / 60);
if(m.length < 2)
m = "0" + m;
s = "" + (sec % 60);
if(s.length < 2)
s = "0" + s;
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if(h === "")
return [m, s].join(":");
return [h, m, s].join(":");
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},
newRateLimiter: function () {
return {
count: 0,
lastTime: 0,
throttle: function (opts) {
if (typeof opts === "undefined")
opts = {};
var burst = +opts.burst,
sustained = +opts.sustained,
cooldown = +opts.cooldown;
if (isNaN(burst))
burst = 10;
if (isNaN(sustained))
sustained = 2;
if (isNaN(cooldown))
cooldown = burst / sustained;
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// Cooled down, allow and clear buffer
if (this.lastTime < Date.now() - cooldown*1000) {
this.count = 1;
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this.lastTime = Date.now();
return false;
}
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// Haven't reached burst cap yet, allow
if (this.count < burst) {
this.count++;
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this.lastTime = Date.now();
return false;
}
var diff = Date.now() - this.lastTime;
if (diff < 1000/sustained)
return true;
this.lastTime = Date.now();
return false;
}
};
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},
formatLink: function (id, type) {
switch (type) {
case "yt":
return "http://youtu.be/" + id;
case "vi":
return "http://vimeo.com/" + id;
case "dm":
return "http://dailymotion.com/video/" + id;
case "sc":
return id;
case "li":
return "http://livestream.com/" + id;
case "tw":
return "http://twitch.tv/" + id;
case "jt":
return "http://justin.tv/" + id;
case "rt":
return id;
case "jw":
return id;
case "im":
return "http://imgur.com/a/" + id;
case "us":
return "http://ustream.tv/" + id;
default:
return "";
}
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},
Set: Set
};