var crypto = require("crypto"); /* 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) { return name.match(/^[\w-]{1,30}$/); }, isValidUserName: function (name) { return name.match(/^[\w-]{1,20}$/); }, isValidEmail: function (email) { if (email.length > 255) { return false; } if (!email.match(/^[^@]+?@[^@]+$/)) { return false; } if (email.match(/^[^@]+?@(localhost|127\.0\.0\.1)$/)) { return false; } return true; }, randomSalt: function (length) { var chars = "abcdefgihjklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" + "0123456789!@#$%^&*_+=~"; var salt = []; for(var i = 0; i < length; i++) { salt.push(chars[parseInt(Math.random()*chars.length)]); } return salt.join(''); }, maskIP: function (ip) { if(ip.match(/^\d+\.\d+\.\d+\.\d+$/)) { // 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; if(h === "") return [m, s].join(":"); return [h, m, s].join(":"); }, 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; // Cooled down, allow and clear buffer if (this.lastTime < Date.now() - cooldown*1000) { this.count = 1; this.lastTime = Date.now(); return false; } // Haven't reached burst cap yet, allow if (this.count < burst) { this.count++; this.lastTime = Date.now(); return false; } var diff = Date.now() - this.lastTime; if (diff < 1000/sustained) return true; this.lastTime = Date.now(); return false; } }; }, 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 ""; } }, isLive: function (type) { switch (type) { case "li": case "tw": case "jt": case "us": case "rt": case "cu": case "im": case "jw": return true; default: return false; } }, Set: Set, sha1: function (data) { var shasum = crypto.createHash("sha1"); shasum.update(data); return shasum.digest("hex"); } };