sync/channel.js

/*
The MIT License (MIT)
Copyright (c) 2013 Calvin Montgomery

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

var fs = require("fs");
var Poll = require("./poll.js").Poll;
var Media = require("./media.js").Media;
var formatTime = require("./media.js").formatTime;
var Logger = require("./logger.js");
var Rank = require("./rank.js");
var Auth = require("./auth.js");
var ChatCommand = require("./chatcommand.js");
var Filter = require("./filter.js").Filter;
var ActionLog = require("./actionlog");
var Playlist = require("./playlist");
var sanitize = require("validator").sanitize;

var Channel = function(name, Server) {
    Logger.syslog.log("Opening channel " + name);
    this.initialized = false;
    this.server = Server;

    this.name = name;
    this.canonical_name = name.toLowerCase();
    // Initialize defaults
    this.registered = false;
    this.users = [];
    this.afkers = [];
    this.playlist = new Playlist(this);
    this.library = {};
    this.position = -1;
    this.drinks = 0;
    this.leader = null;
    this.chatbuffer = [];
    this.openqueue = false;
    this.poll = false;
    this.voteskip = false;
    this.permissions = {
        oplaylistadd: -1,
        oplaylistnext: 1.5,
        oplaylistmove: 1.5,
        oplaylistdelete: 2,
        oplaylistjump: 1.5,
        oplaylistaddlist: 1.5,
        playlistadd: 1.5,
        playlistnext: 1.5,
        playlistmove: 1.5,
        playlistdelete: 2,
        playlistjump: 1.5,
        playlistaddlist: 1.5,
        playlistaddcustom: 3,
        playlistaddlive: 1.5,
        exceedmaxlength: 2,
        addnontemp: 2,
        settemp: 2,
        playlistgeturl: 1.5,
        playlistshuffle: 2,
        playlistclear: 2,
        pollctl: 1.5,
        pollvote: -1,
        mute: 1.5,
        kick: 1.5,
        ban: 2,
        motdedit: 3,
        filteredit: 3,
        drink: 1.5,
        chat: 0
    };
    this.opts = {
        allow_voteskip: true,
        voteskip_ratio: 0.5,
        afk_timeout: 180,
        pagetitle: this.name,
        maxlength: 0,
        externalcss: "",
        externaljs: "",
        chat_antiflood: false,
        show_public: false,
        enable_link_regex: true
    };
    this.filters = [
        new Filter("monospace", "`([^`]+)`", "g", "<code>$1</code>"),
        new Filter("bold", "(^|\\s)\\*([^\\*]+)\\*", "g", "$1<strong>$2</strong>"),
        new Filter("italic", "(^| )_([^_]+)_", "g", "$1<em>$2</em>"),
        new Filter("strikethrough", "~~([^~]+)~~", "g", "<s>$1</s>"),
        new Filter("inline spoiler", "\\[spoiler\\](.*)\\[\\/spoiler\\]", "ig", "<span class=\"spoiler\">$1</span>"),
    ];
    this.motd = {
        motd: "",
        html: ""
    };
    this.ipbans = {};
    this.namebans = {};
    this.ip_alias = {};
    this.name_alias = {};
    this.login_hist = [];
    this.logger = new Logger.Logger("chanlogs/" + this.canonical_name + ".log");
    this.i = 0;
    this.time = new Date().getTime();
    this.plmeta = {
        count: 0,
        time: "00:00"
    };

    this.css = "";
    this.js = "";

    this.ipkey = "";
    for(var i = 0; i < 15; i++) {
        this.ipkey += "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"[parseInt(Math.random() * 65)]
    }

    Server.db.loadChannel(this);
    if(this.registered) {
        this.loadDump();
    }
}

/* REGION Permissions */
Channel.prototype.hasPermission = function(user, key) {
    if(key.indexOf("playlist") == 0 && this.openqueue) {
        var key2 = "o" + key;
        var v = this.permissions[key2];
        if(typeof v == "number" && user.rank >= v) {
            return true;
        }
    }
    var v = this.permissions[key];
    if(typeof v != "number") {
        return false;
    }
    return user.rank >= v;
}

/* REGION Channel data */
Channel.prototype.loadDump = function() {
    var self = this;
    fs.stat("chandump/" + this.name, function (err, stats) {
        if(!err) {
            var mb = stats.size / 1048576;
            mb = parseInt(mb * 100) / 100;
            if(mb > 1) {
                Logger.errlog.log("Large chandump detected: " + self.name +
                                  " (" + mb + " MB)");
                self.updateMotd("Your channel file has exceeded the " +
                                "maximum size of 1MB and cannot be " + 
                                "loaded.  Please ask an administrator " + 
                                "for assistance in restoring it.");
                return;
            }
        }
        fs.readFile("chandump/" + self.name, function(err, data) {
            if(err) {
                if(err.code == "ENOENT") {
                    Logger.errlog.log("WARN: missing dump for " + self.name);
                    self.initialized = true;
                    self.saveDump();
                }
                else {
                    Logger.errlog.log("Failed to open channel dump " + self.name);
                    Logger.errlog.log(err);
                }
                return;
            }
            try {
                self.logger.log("*** Loading channel dump from disk");
                data = JSON.parse(data);
                /* Load the playlist */

                // Old
                if(data.queue) {
                    if(data.position < 0)
                        data.position = 0;
                    for(var i = 0; i < data.queue.length; i++) {
                        var e = data.queue[i];
                        var m = new Media(e.id, e.title, e.seconds, e.type);
                        var p = self.playlist.makeItem(m);
                        p.queueby = data.queue[i].queueby ? data.queue[i].queueby
                                                          : "";
                        p.temp = e.temp;
                        self.playlist.items.append(p);
                        if(i == data.position)
                            self.playlist.current = p;
                    }
                    self.sendAll("playlist", self.playlist.items.toArray());
                    self.broadcastPlaylistMeta();
                    self.playlist.startPlayback();
                }
                // Current
                else if(data.playlist) {
                    var chan = self;
                    self.playlist.load(data.playlist, function() {
                        chan.sendAll("playlist", chan.playlist.items.toArray());
                        chan.broadcastPlaylistMeta();
                        chan.playlist.startPlayback(data.playlist.time);
                    });
                }
                for(var key in data.opts) {
                    // Gotta love backwards compatibility
                    if(key == "customcss" || key == "customjs") {
                        var k = key.substring(6);
                        self.opts[k] = data.opts[key];
                    }
                    else {
                        self.opts[key] = data.opts[key];
                    }
                }
                for(var key in data.permissions) {
                    self.permissions[key] = data.permissions[key];
                }
                self.sendAll("setPermissions", self.permissions);
                self.broadcastOpts();
                self.users.forEach(function (u) {
                    u.autoAFK();
                });
                if(data.filters) {
                    for(var i = 0; i < data.filters.length; i++) {
                        var f = data.filters[i];
                        // Backwards compatibility
                        if(f[0] != undefined) {
                            var filt = new Filter("", f[0], "g", f[1]);
                            filt.active = f[2];
                            self.updateFilter(filt, false);
                        }
                        else {
                            var filt = new Filter(f.name, f.source, f.flags, f.replace);
                            filt.active = f.active;
                            filt.filterlinks = f.filterlinks;
                            self.updateFilter(filt, false);
                        }
                    }
                    self.broadcastChatFilters();
                }
                if(data.motd) {
                    self.motd = data.motd;
                    self.broadcastMotd();
                }
                self.setLock(!(data.openqueue || false));
                self.chatbuffer = data.chatbuffer || [];
                for(var i = 0; i < self.chatbuffer.length; i++) {
                    self.sendAll("chatMsg", self.chatbuffer[i]);
                }
                self.css = data.css || "";
                self.js = data.js || "";
                self.sendAll("channelCSSJS", {css: self.css, js: self.js});
                self.initialized = true;
                setTimeout(function() { incrementalDump(self); }.bind(self), 300000);
            }
            catch(e) {
                Logger.errlog.log("Channel dump load failed: ");
                Logger.errlog.log(e.stack);
            }
        });
    });
}

Channel.prototype.saveDump = function() {
    if(!this.initialized)
        return;
    var filts = new Array(this.filters.length);
    for(var i = 0; i < this.filters.length; i++) {
        filts[i] = this.filters[i].pack();
    }
    var dump = {
        position: this.position,
        currentTime: this.media ? this.media.currentTime : 0,
        playlist: this.playlist.dump(),
        opts: this.opts,
        permissions: this.permissions,
        filters: filts,
        motd: this.motd,
        openqueue: this.openqueue,
        chatbuffer: this.chatbuffer,
        css: this.css,
        js: this.js
    };
    var text = JSON.stringify(dump);
    fs.writeFileSync("chandump/" + this.name, text);
}

// Save channel dumps every 5 minutes, in case of crash
function incrementalDump(chan) {
    if(chan && chan.users && chan.users.length > 0) {
        chan.saveDump();
        setTimeout(function() { incrementalDump(chan); }, 300000);
    }
}

Channel.prototype.readLog = function (filterIp, callback) {
    var maxLen = 100000; // Most recent 100KB
    var file = this.logger.filename;
    fs.stat(file, function (err, data) {
        if(err) {
            callback(err, null);
            return;
        }

        var start = data.size - maxLen;
        if(start < 0) {
            start = 0;
        }
        var end = data.size - 1;

        var rs = fs.createReadStream(file, {
            start: start,
            end: end
        });

        var buffer = "";
        rs.on("data", function (data) {
            buffer += data;
        });

        rs.on("end", function () {
            if(filterIp) {
                buffer = buffer.replace(
                    /(\d{1,3}\.){2}(\d{1,3})\.(\d{1,3})/g,
                    "x.x.$2.$3"
                );
            }

            callback(false, buffer);
        });
    });
}

Channel.prototype.tryReadLog = function (user) {
    if(user.rank < 3)
        return;

    var filterIp = true;
    if(user.global_rank >= 255)
        filterIp = false;

    this.readLog(filterIp, function (err, data) {
        if(err) {
            user.socket.emit("readChanLog", {
                success: false
            });
        } else {
            user.socket.emit("readChanLog", {
                success: true,
                data: data
            });
        }
    });
}

Channel.prototype.tryRegister = function(user) {
    if(this.registered) {
        ActionLog.record(user.ip, user.name, "channel-register-failure", [
            this.name, "Channel already registered"]);
        user.socket.emit("registerChannel", {
            success: false,
            error: "This channel is already registered"
        });
    }
    else if(!user.loggedIn) {
        ActionLog.record(user.ip, user.name, "channel-register-failure", [
            this.name, "Not logged in"]);
        user.socket.emit("registerChannel", {
            success: false,
            error: "You must log in to register a channel"
        });

    }
    else if(!Rank.hasPermission(user, "registerChannel")) {
        ActionLog.record(user.ip, user.name, "channel-register-failure", [
            this.name, "Insufficient permissions"]);
        user.socket.emit("registerChannel", {
            success: false,
            error: "You don't have permission to register this channel"
        });
    }
    else {
        if(this.server.db.registerChannel(this.name, user.name)) {
            ActionLog.record(user.ip, user.name, "channel-register-success", this.name);
            this.registered = true;
            this.initialized = true;
            this.saveDump();
            this.saveRank(user);
            user.socket.emit("registerChannel", {
                success: true,
            });
            this.logger.log("*** " + user.name + " registered the channel");
            Logger.syslog.log("Channel " + this.name + " was registered by " + user.name);
        }
        else {
            user.socket.emit("registerChannel", {
                success: false,
                error: "Unable to register channel, see an admin"
            });
        }
    }
}

Channel.prototype.unregister = function() {
    if(this.server.db.deleteChannel(this.name)) {
        this.registered = false;
        return true;
    }
    return false;
}

Channel.prototype.getRank = function(name) {
    var global = Auth.getGlobalRank(name);
    if(!this.registered) {
        return global;
    }
    var local = this.server.db.getChannelRank(this.name, name);
    return local > global ? local : global;
}

Channel.prototype.saveRank = function(user) {
    return this.server.db.setChannelRank(this.name, user.name, user.rank);
}

Channel.prototype.getIPRank = function(ip) {
    var names = [];
    if(!(ip in this.ip_alias))
        this.ip_alias[ip] = this.server.db.getAliases(ip);
    this.ip_alias[ip].forEach(function(name) {
        names.push(name);
    });

    var ranks = this.server.db.getChannelRank(this.name, names);
    var rank = 0;
    for(var i = 0; i < ranks.length; i++) {
        rank = (ranks[i] > rank) ? ranks[i] : rank;
    }
    return rank;
}

Channel.prototype.cacheMedia = function(media) {
    // Prevent the copy in the playlist from messing with this one
    media = media.dup();
    if(media.temp) {
        return;
    }
    this.library[media.id] = media;
    if(this.registered) {
        return this.server.db.addToLibrary(this.name, media);
    }
    return false;
}

Channel.prototype.tryNameBan = function(actor, name) {
    if(!this.hasPermission(actor, "ban")) {
        return false;
    }

    name = name.toLowerCase();

    var rank = this.getRank(name);
    if(rank >= actor.rank) {
        actor.socket.emit("errorMsg", {msg: "You don't have permission to ban this person."});
        return false;
    }

    this.namebans[name] = actor.name;
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name.toLowerCase() == name) {
            this.kick(this.users[i], "You're banned!");
            break;
        }
    }
    this.logger.log("*** " + actor.name + " namebanned " + name);
    var chan = this;
    this.users.forEach(function(u) {
        chan.sendBanlist(u);
    });
    if(!this.registered) {
        return false;
    }

    return this.server.db.channelBan(this.name, "*", name, actor.name);
}

Channel.prototype.unbanName = function(actor, name) {
    if(!this.hasPermission(actor, "ban")) {
        return false;
    }

    this.namebans[name] = null;
    delete this.namebans[name];
    this.logger.log("*** " + actor.name + " un-namebanned " + name);

    var chan = this;
    this.users.forEach(function(u) {
        chan.sendBanlist(u);
    });
    return this.server.db.channelUnbanName(this.name, name);
}

Channel.prototype.tryIPBan = function(actor, name, range) {
    if(!this.hasPermission(actor, "ban")) {
        return false;
    }
    if(typeof name != "string") {
        return false;
    }
    var ips = this.server.db.ipForName(name);
    var chan = this;
    ips.forEach(function(ip) {
        if(chan.getIPRank(ip) >= actor.rank) {
            actor.socket.emit("errorMsg", {msg: "You don't have permission to ban IP: x.x." + ip.replace(/\d+\.\d+\.(\d+\.\d+)/, "$1")});
            return false;
        }

        if(range) {
            ip = ip.replace(/(\d+)\.(\d+)\.(\d+)\.(\d+)/, "$1.$2.$3");
            for(var ip2 in chan.ip_alias) {
                if(ip2.indexOf(ip) == 0 && chan.getIPRank(ip2) >= actor.rank) {
                    actor.socket.emit("errorMsg", {msg: "You don't have permission to ban IP: x.x." + ip2.replace(/\d+\.\d+\.(\d+\.\d+)/, "$1")});
                    return false;
                }
            }
        }
        chan.ipbans[ip] = [name, actor.name];
        //chan.broadcastBanlist();
        chan.logger.log("*** " + actor.name + " banned " + ip + " (" + name + ")");

        for(var i = 0; i < chan.users.length; i++) {
            if(chan.users[i].ip.indexOf(ip) == 0) {
                chan.kick(chan.users[i], "Your IP is banned!");
                i--;
            }
        }

        if(!chan.registered)
            return false;

        // Update database ban table
        return chan.server.db.channelBan(chan.name, ip, name, actor.name);
    });

    var chan = this;
    this.users.forEach(function(u) {
        chan.sendBanlist(u);
    });
}

Channel.prototype.banIP = function(actor, receiver) {
    if(!this.hasPermission(actor, "ban"))
        return false;

    this.ipbans[receiver.ip] = [receiver.name, actor.name];
    try {
        receiver.socket.disconnect(true);
    }
    catch(e) {
        // Socket already disconnected
    }
    //this.broadcastBanlist();
    this.logger.log(receiver.ip + " (" + receiver.name + ") was banned by " + actor.name);

    if(!this.registered)
        return false;

    // Update database ban table
    return this.server.db.channelBanIP(this.name, receiver.ip, receiver.name, actor.name);
}

Channel.prototype.unbanIP = function(actor, ip) {
    if(!this.hasPermission(actor, "ban"))
        return false;

    this.ipbans[ip] = null;
    var chan = this;
    this.users.forEach(function(u) {
        chan.sendBanlist(u);
    });

    this.logger.log("*** " + actor.name + " unbanned " + ip);

    if(!this.registered)
        return false;

    //this.broadcastBanlist();
    // Update database ban table
    return this.server.db.channelUnbanIP(this.name, ip);
}

Channel.prototype.tryUnban = function(actor, data) {
    if(data.ip_hidden) {
        var ip = this.hideIP(data.ip_hidden);
        this.unbanIP(actor, ip);
    }
    if(data.name) {
        this.unbanName(actor, data.name);
    }
}

Channel.prototype.search = function(query, callback) {
    // Search youtube
    if(callback) {
        if(query.trim() == "") {
            return;
        }
        this.server.infogetter.Getters["ytSearch"](query.split(" "), function(err, vids) {
            if(!err) {
                callback(vids);
            }
        });
        return;
    }

    query = query.toLowerCase();
    var results = [];
    for(var id in this.library) {
        if(this.library[id].title.toLowerCase().indexOf(query) != -1) {
            results.push(this.library[id]);
        }
    }
    results.sort(function(a, b) {
        var x = a.title.toLowerCase();
        var y = b.title.toLowerCase();

        return (x == y) ? 0 : (x < y ? -1 : 1);
    });

    return results;
}

/* REGION User interaction */

Channel.prototype.userJoin = function(user) {
    var parts = user.ip.split(".");
    var slash24 = parts[0] + "." + parts[1] + "." + parts[2];
    // GTFO
    if((user.ip in this.ipbans && this.ipbans[user.ip] != null) ||
       (slash24 in this.ipbans && this.ipbans[slash24] != null)) {
        this.logger.log("--- Kicking " + user.ip + " - banned");
        this.kick(user, "You're banned!");
        return;
    }
    if(user.name && user.name.toLowerCase() in this.namebans &&
        this.namebans[user.name.toLowerCase()] != null) {
        this.kick(user, "You're banned!");
        return;
    }

    // Join the socket pool for this channel
    user.socket.join(this.name);

    // Prevent duplicate login
    if(user.name != "") {
        for(var i = 0; i < this.users.length; i++) {
            if(this.users[i].name.toLowerCase() == user.name.toLowerCase()) {
                this.kick(this.users[i], "Duplicate login");
            }
        }
    }

    // If the channel is empty and isn't registered, the first person
    // gets ownership of the channel (temporarily)
    if(this.users.length == 0 && !this.registered) {
        user.rank = (user.rank < Rank.Owner) ? 10 : user.rank;
        user.socket.emit("channelNotRegistered");
    }
    this.users.push(user);
    this.broadcastVoteskipUpdate();
    if(user.name != "") {
        this.broadcastNewUser(user);
    }
    this.broadcastUsercount();

    // Set the new guy up
    this.sendPlaylist(user);
    this.sendMediaUpdate(user);
    user.socket.emit("setPlaylistLocked", {locked: !this.openqueue});
    this.sendUserlist(user);
    this.sendRecentChat(user);
    user.socket.emit("channelCSSJS", {css: this.css, js: this.js});
    if(this.poll) {
        user.socket.emit("newPoll", this.poll.packUpdate());
    }
    user.socket.emit("channelOpts", this.opts);
    user.socket.emit("setPermissions", this.permissions);
    user.socket.emit("setMotd", this.motd);
    user.socket.emit("drinkCount", this.drinks);

    // Send things that require special permission
    this.sendRankStuff(user);

    this.logger.log("+++ " + user.ip + " joined");
    Logger.syslog.log(user.ip + " joined channel " + this.name);
}

Channel.prototype.userLeave = function(user) {
    // Their socket might already be dead, so wrap in a try-catch
    try {
        user.socket.leave(this.name);
    }
    catch(e) {}

    // Undo vote for people who leave
    if(this.poll) {
        this.poll.unvote(user.ip);
        this.broadcastPollUpdate();
    }
    if(this.voteskip) {
        this.voteskip.unvote(user.ip);
    }

    // If they were leading, return control to the server
    if(this.leader == user) {
        this.changeLeader("");
    }

    // Remove the user from the client list for this channel
    var idx = this.users.indexOf(user);
    if(idx >= 0 && idx < this.users.length)
        this.users.splice(idx, 1);
    idx = this.afkers.indexOf(user.name.toLowerCase());
    if(idx >= 0 && idx < this.afkers.length)
        this.afkers.splice(idx, 1);
    this.checkVoteskipPass();
    this.broadcastUsercount();
    if(user.name != "") {
        this.sendAll("userLeave", {
            name: user.name
        });
    }
    this.logger.log("--- " + user.ip + " (" + user.name + ") left");
    if(this.users.length == 0) {
        this.logger.log("*** Channel empty, unloading");
        this.server.unloadChannel(this);
    }
}

Channel.prototype.kick = function(user, reason) {
    user.socket.emit("kick", {
        reason: reason
    });
    if(user.socket.disconnected) {
        this.userLeave(user);
    }
    user.socket.disconnect(true);
}

Channel.prototype.hideIP = function(ip) {
    var chars = new Array(15);
    for(var i = 0; i < ip.length; i++) {
        chars[i] = String.fromCharCode(ip.charCodeAt(i) ^ this.ipkey.charCodeAt(i));
    }
    return chars.join("");
}

Channel.prototype.sendLoginHistory = function(user) {
    if(user.rank < 2)
        return;

    user.socket.emit("recentLogins", this.login_hist);
}

Channel.prototype.sendBanlist = function(user) {
    if(this.hasPermission(user, "ban")) {
        var ents = [];
        for(var ip in this.ipbans) {
            if(this.ipbans[ip] != null) {
                var name = this.ipbans[ip][0];
                var ip_hidden = this.hideIP(ip);
                var disp = ip;
                if(user.rank < Rank.Siteadmin) {
                    disp = "x.x." + ip.replace(/\d+\.\d+\.(\d+\.\d+)/, "$1");
                }
                ents.push({
                    ip_displayed: disp,
                    ip_hidden: ip_hidden,
                    name: name,
                    aliases: this.ip_alias[ip] || [],
                    banner: this.ipbans[ip][1]
                });
            }
        }
        for(var name in this.namebans) {
            if(this.namebans[name] != null) {
                ents.push({
                    ip_displayed: "*",
                    ip_hidden: false,
                    name: name,
                    aliases: this.name_alias[name] || [],
                    banner: this.namebans[name]
                });
            }
        }
        user.socket.emit("banlist", ents);
    }
}

Channel.prototype.sendChatFilters = function(user) {
    if(this.hasPermission(user, "filteredit")) {
        var filts = new Array(this.filters.length);
        for(var i = 0; i < this.filters.length; i++) {
            filts[i] = this.filters[i].pack();
        }
        user.socket.emit("chatFilters", filts);
    }
}

Channel.prototype.sendRankStuff = function(user) {
    this.sendBanlist(user);
    this.sendChatFilters(user);
    this.sendChannelRanks(user);
}

Channel.prototype.sendChannelRanks = function(user) {
    if(Rank.hasPermission(user, "acl")) {
        user.socket.emit("channelRanks", this.server.db.listChannelRanks(this.name));
    }
}

Channel.prototype.sendPlaylist = function(user) {
    user.socket.emit("playlist", this.playlist.items.toArray());
    if(this.playlist.current)
        user.socket.emit("setCurrent", this.playlist.current.uid);
    user.socket.emit("setPlaylistMeta", this.plmeta);
}

Channel.prototype.sendMediaUpdate = function(user) {
    if(this.playlist.current != null) {
        user.socket.emit("changeMedia", this.playlist.current.media.fullupdate());
    }
}

Channel.prototype.sendUserlist = function(user) {
    var users = [];
    for(var i = 0; i < this.users.length; i++) {
        // Skip people who haven't logged in
        if(this.users[i].name != "") {
            users.push({
                name: this.users[i].name,
                rank: this.users[i].rank,
                leader: this.users[i] == this.leader,
                meta: this.users[i].meta,
                profile: this.users[i].profile
            });
        }
    }
    user.socket.emit("userlist", users);
}

// Send the last 15 messages for context
Channel.prototype.sendRecentChat = function(user) {
    for(var i = 0; i < this.chatbuffer.length; i++) {
        user.socket.emit("chatMsg", this.chatbuffer[i]);
    }
}

/* REGION Broadcasts to all clients */

Channel.prototype.sendAll = function(message, data) {
    if(this.name == "")
        return;
    this.server.io.sockets.in(this.name).emit(message, data);
}

Channel.prototype.sendAllWithPermission = function(perm, msg, data) {
    for(var i = 0; i < this.users.length; i++) {
        if(Rank.hasPermission(this.users[i], perm)) {
            this.users[i].socket.emit(msg, data);
        }
    }
}

Channel.prototype.broadcastPlaylistMeta = function() {
    var total = 0;
    var iter = this.playlist.items.first;
    while(iter !== null) {
        if(iter.media !== null)
            total += iter.media.seconds;
        iter = iter.next;
    }
    var timestr = formatTime(total);
    var packet = {
        count: this.playlist.items.length,
        time: timestr
    };
    this.plmeta = packet;
    this.sendAll("setPlaylistMeta", packet);
}

Channel.prototype.broadcastUsercount = function() {
    this.sendAll("usercount", this.users.length);
}

Channel.prototype.broadcastNewUser = function(user) {
    var aliases = this.server.db.getAliases(user.ip);
    var chan = this;
    this.ip_alias[user.ip] = aliases;
    aliases.forEach(function(alias) {
        chan.name_alias[alias] = aliases;
    });

    this.login_hist.unshift({
        name: user.name,
        aliases: this.ip_alias[user.ip],
        time: Date.now()
    });
    if(this.login_hist.length > 20)
        this.login_hist.pop();

    if(user.name.toLowerCase() in this.namebans &&
        this.namebans[user.name.toLowerCase()] != null) {
        this.kick(user, "You're banned!");
        return;
    }
    this.sendAll("addUser", {
        name: user.name,
        rank: user.rank,
        leader: this.leader == user,
        meta: user.meta,
        profile: user.profile
    });
    //this.sendRankStuff(user);
    if(user.rank > Rank.Guest) {
        this.saveRank(user);
    }

    var msg = user.name + " joined (aliases: ";
    msg += this.ip_alias[user.ip].join(", ") + ")";
    var pkt = {
        username: "[server]",
        msg: msg,
        msgclass: "server-whisper",
        time: Date.now()
    };
    this.users.forEach(function(u) {
        if(u.rank >= 2) {
            u.socket.emit("joinMessage", pkt);
        }
    });
}

Channel.prototype.broadcastUserUpdate = function(user) {
    this.sendAll("updateUser", {
        name: user.name,
        rank: user.rank,
        leader: this.leader == user,
        meta: user.meta,
        profile: user.profile
    });
    this.sendRankStuff(user);
}

Channel.prototype.broadcastPoll = function() {
    this.sendAll("newPoll", this.poll.packUpdate());
}

Channel.prototype.broadcastPollUpdate = function() {
    this.sendAll("updatePoll", this.poll.packUpdate());
}

Channel.prototype.broadcastPollClose = function() {
    this.sendAll("closePoll");
}

Channel.prototype.broadcastOpts = function() {
    this.sendAll("channelOpts", this.opts);
}

Channel.prototype.broadcastBanlist = function() {
    var ents = [];
    var adminents = [];
    for(var ip in this.ipbans) {
        if(this.ipbans[ip] != null) {
            var name = this.ipbans[ip][0];
            var ip_hidden = this.hideIP(ip);
            ents.push({
                ip_displayed: "x.x." + ip.replace(/\d+\.\d+\.(\d+\.\d+)/, "$1"),
                ip_hidden: ip_hidden,
                name: name,
                aliases: this.ip_alias[ip] || [],
                banner: this.ipbans[ip][1]
            });
            adminents.push({
                ip_displayed: ip,
                ip_hidden: ip_hidden,
                name: name,
                aliases: this.ip_alias[ip] || [],
                banner: this.ipbans[ip][1]
            });
        }
    }
    for(var name in this.namebans) {
        if(this.namebans[name] != null) {
            ents.push({
                ip_displayed: "*",
                ip_hidden: false,
                name: name,
                aliases: this.name_alias[name] || [],
                banner: this.namebans[name]
            });
            adminents.push({
                ip_displayed: "*",
                ip_hidden: false,
                name: name,
                aliases: this.name_alias[name] || [],
                banner: this.namebans[name]
            });
        }
    }
    for(var i = 0; i < this.users.length; i++) {
        if(this.hasPermission(this.users[i], "ban")) {
            if(this.users[i].rank >= Rank.Siteadmin) {
                this.users[i].socket.emit("banlist", adminents);
            }
            else {
                this.users[i].socket.emit("banlist", ents);
            }
        }
    }
}

Channel.prototype.broadcastRankTable = function() {
    var ranks = this.server.db.listChannelRanks(this.name);
    for(var i = 0; i < this.users.length; i++) {
        this.sendACL(this.users[i]);
    }
}

Channel.prototype.broadcastChatFilters = function() {
    var filts = new Array(this.filters.length);
    for(var i = 0; i < this.filters.length; i++) {
        filts[i] = this.filters[i].pack();
    }
    for(var i = 0; i < this.users.length; i++) {
        if(this.hasPermission(this.users[i], "filteredit")) {
            this.users[i].socket.emit("chatFilters", filts);
        }
    }
}

Channel.prototype.broadcastVoteskipUpdate = function() {
    var amt = this.voteskip ? this.voteskip.counts[0] : 0;
    var count = this.users.length - this.afkers.length;
    var need = this.voteskip ? Math.ceil(count * this.opts.voteskip_ratio) : 0;
    for(var i = 0; i < this.users.length; i++) {
        if(Rank.hasPermission(this.users[i], "seeVoteskip") ||
                this.leader == this.users[i]) {
            this.users[i].socket.emit("voteskip", {
                count: amt,
                need: need
            });
        }
    }
}

Channel.prototype.broadcastMotd = function() {
    this.sendAll("setMotd", this.motd);
}

Channel.prototype.broadcastDrinks = function() {
    this.sendAll("drinkCount", this.drinks);
}

/* REGION Playlist Stuff */

Channel.prototype.onVideoChange = function () {
    this.voteskip = false;
    this.broadcastVoteskipUpdate();
    this.drinks = 0;
    this.broadcastDrinks();
}

// The server autolead function
function mediaUpdate(chan, id) {
    // Bail cases - video changed, someone's leader, no video playing
    if(chan.media == null ||
           id != chan.media.id ||
           chan.leader != null ||
           chan.users.length == 0) {
        return;
    }

    chan.media.currentTime += (new Date().getTime() - chan.time) / 1000.0;
    chan.time = new Date().getTime();

    // Show's over, move on to the next thing
    if(chan.media.currentTime > chan.media.seconds + 1) {
        chan.playNext();
    }
    // Send updates about every 5 seconds
    else if(chan.i % 5 == 0) {
        chan.sendAll("mediaUpdate", chan.media.timeupdate());
    }
    chan.i++;

    setTimeout(function() { mediaUpdate(chan, id); }, 1000);
}

function isLive(type) {
    return type == "li" // Livestream.com
        || type == "tw" // Twitch.tv
        || type == "jt" // Justin.tv
        || type == "rt" // RTMP
        || type == "jw" // JWPlayer
        || type == "us" // Ustream.tv
        || type == "im" // Imgur album
        || type == "cu";// Custom Embed
}

Channel.prototype.queueAdd = function(item, after) {
    var chan = this;
    function afterAdd() {
        chan.sendAll("queue", {
            item: item.pack(),
            after: after
        });
        chan.broadcastPlaylistMeta();
    }
    if(after === "prepend")
        this.playlist.prepend(item, afterAdd);
    else if(after === "append")
        this.playlist.append(item, afterAdd);
    else
        this.playlist.insertAfter(item, after, afterAdd);
}

Channel.prototype.autoTemp = function(item, user) {
    if(isLive(item.media.type)) {
        item.temp = true;
    }
    if(!this.hasPermission(user, "addnontemp")) {
        item.temp = true;
    }
}

Channel.prototype.tryQueue = function(user, data) {
    if(!this.hasPermission(user, "playlistadd")) {
        return;
    }
    if(typeof data.pos !== "string") {
        return;
    }
    if(typeof data.id !== "string" && data.id !== false) {
        return;
    }
    if(typeof data.type !== "string" && !(data.id in this.library)) {
        return;
    }

    if(data.pos == "next" && !this.hasPermission(user, "playlistnext")) {
        return;
    }

    if(user.rank < Rank.Moderator
            && this.leader != user
            && user.noflood("queue", 3)) {
        return;
    }

    if(user.rank < Rank.Moderator && this.playlist.count(data.id) > 10) {
        user.socket.emit("queueFail", "That video is already on the " + 
                         "playlist 10 times.");
    }

    data.queueby = user ? user.name : "";
    data.temp = !this.hasPermission(user, "addnontemp");

    if(data.list)
        this.addMediaList(data, user);
    else
        this.addMedia(data, user);
}

Channel.prototype.addMedia = function(data, user) {
    if(data.type === "yp" && !this.hasPermission(user, "playlistaddlist")) {
        user.socket.emit("queueFail", "You don't have permission to add playlists");
        return;
    }
    if(data.type === "cu" && !this.hasPermission(user, "playlistaddcustom")) {
        user.socket.emit("queueFail", "You don't have permission to add cusstom embeds");
        return;
    }
    data.temp = data.temp || isLive(data.type);
    data.queueby = user ? user.name : "";
    data.maxlength = this.hasPermission(user, "exceedmaxlength") ? 0 : this.opts.maxlength;
    var chan = this;
    if(data.id in this.library) {
        var m = this.library[data.id].dup();
        if(data.maxlength && m.seconds > data.maxlength) {
            user.socket.emit("queueFail", "Media is too long!");
            return;
        }

        data.media = m;
        this.playlist.addCachedMedia(data, function (err, item) {
            if(err) {
                if(err === true)
                    err = false;
                if(user)
                    user.socket.emit("queueFail", err);
                return;
            }
            else {
                chan.logger.log("### " + user.name + " queued " + item.media.title);
                chan.sendAll("queue", {
                    item: item.pack(),
                    after: item.prev ? item.prev.uid : "prepend"
                });
                chan.broadcastPlaylistMeta();
            }
        });
        return;
    }
    if(isLive(data.type) && !this.hasPermission(user, "playlistaddlive")) {
        user.socket.emit("queueFail", "You don't have permission to queue livestreams");
        return;
    }

    this.playlist.addMedia(data, function(err, item) {
        if(err) {
            if(err === true)
                err = false;
            if(user)
                user.socket.emit("queueFail", err);
            return;
        }
        else {
            chan.logger.log("### " + user.name + " queued " + item.media.title);
            chan.sendAll("queue", {
                item: item.pack(),
                after: item.prev ? item.prev.uid : "prepend"
            });
            chan.broadcastPlaylistMeta();
            if(!item.temp)
                chan.cacheMedia(item.media);
        }
    });
}

Channel.prototype.addMediaList = function(data, user) {
    var chan = this;
    this.playlist.addMediaList(data, function(err, item) {
        if(err) {
            if(err === true)
                err = false;
            if(user)
                user.socket.emit("queueFail", err);
            return;
        }
        else {
            chan.logger.log("### " + user.name + " queued " + item.media.title);
            item.temp = data.temp;
            item.queueby = data.queueby;
            chan.sendAll("queue", {
                item: item.pack(),
                after: item.prev ? item.prev.uid : "prepend"
            });
            chan.broadcastPlaylistMeta();
            if(!item.temp)
                chan.cacheMedia(item.media);
        }
    });
}

Channel.prototype.tryQueuePlaylist = function(user, data) {
    if(!this.hasPermission(user, "playlistaddlist")) {
        return;
    }

    if(typeof data.name != "string" ||
       typeof data.pos != "string") {
        return;
    }

    if(data.pos == "next" && !this.hasPermission(user, "playlistnext")) {
        return;
    }

    var pl = this.server.db.loadUserPlaylist(user.name, data.name);
    data.list = pl;
    data.queueby = user.name;
    data.temp = !this.hasPermission(user, "addnontemp");
    this.addMediaList(data, user);
}

Channel.prototype.setTemp = function(uid, temp) {
    var item = this.playlist.items.find(uid);
    if(!item)
        return;
    item.temp = temp;
    this.sendAll("setTemp", {
        uid: uid,
        temp: temp
    });

    if(!temp) {
        this.cacheMedia(item.media);
    }
}

Channel.prototype.trySetTemp = function(user, data) {
    if(!this.hasPermission(user, "settemp")) {
        return;
    }
    if(typeof data.uid != "number" || typeof data.temp != "boolean") {
        return;
    }

    this.setTemp(data.uid, data.temp);
}


Channel.prototype.dequeue = function(uid) {
    var chan = this;
    function afterDelete() {
        chan.sendAll("delete", {
            uid: uid
        });
        chan.broadcastPlaylistMeta();
    }
    if(!this.playlist.remove(uid, afterDelete))
        return;
}

Channel.prototype.tryDequeue = function(user, data) {
    if(!this.hasPermission(user, "playlistdelete"))
        return;

    if(typeof data !== "number")
        return;
    
    var plitem = this.playlist.items.find(data);
    if(plitem && plitem.media)
        this.logger.log("### " + user.name + " deleted " + plitem.media.title);
    this.dequeue(data);
}

Channel.prototype.tryUncache = function(user, data) {
    if(!Rank.hasPermission(user, "uncache")) {
        return;
    }
    if(typeof data.id != "string") {
        return;
    }
    if(this.server.db.removeFromLibrary(this.name, data.id)) {
        var msg = data.id;
        if(data.id in this.library)
            msg = this.library[data.id];
        this.logger.log("*** " + user.name + " deleted " + msg + " from library");
        delete this.library[data.id];
    }
}

Channel.prototype.playNext = function() {
    this.playlist.next();
}

Channel.prototype.tryPlayNext = function(user) {
    if(!this.hasPermission(user, "playlistjump")) {
         return;
    }

    this.logger.log("### " + user.name + " skipped the video");

    this.playNext();
}

Channel.prototype.jumpTo = function(uid) {
    return this.playlist.jump(uid);
}

Channel.prototype.tryJumpTo = function(user, data) {
    if(!this.hasPermission(user, "playlistjump")) {
         return;
    }

    if(typeof data !== "number") {
        return;
    }

    this.logger.log("### " + user.name + " skipped the video");

    this.jumpTo(data);
}

Channel.prototype.clearqueue = function() {
    this.playlist.clear();
    this.sendAll("playlist", this.playlist.items.toArray());
    this.broadcastPlaylistMeta();
}

Channel.prototype.tryClearqueue = function(user) {
    if(!this.hasPermission(user, "playlistclear")) {
        return;
    }

    this.logger.log("### " + user.name + " cleared the playlist");
    this.clearqueue();
}

Channel.prototype.shufflequeue = function() {
    var n = [];
    var pl = this.playlist.items.toArray(false);
    this.playlist.clear();
    while(pl.length > 0) {
        var i = parseInt(Math.random() * pl.length);
        var item = this.playlist.makeItem(pl[i].media);
        item.temp = pl[i].temp;
        item.queueby = pl[i].queueby;
        this.playlist.items.append(item);
        pl.splice(i, 1);
    }
    this.playlist.current = this.playlist.items.first;
    this.sendAll("playlist", this.playlist.items.toArray());
    this.sendAll("setPlaylistMeta", this.plmeta);
    this.playlist.startPlayback();
}

Channel.prototype.tryShufflequeue = function(user) {
    if(!this.hasPermission(user, "playlistshuffle")) {
        return;
    }
    this.logger.log("### " + user.name + " shuffled the playlist");
    this.shufflequeue();
}

Channel.prototype.tryUpdate = function(user, data) {
    if(this.leader != user) {
        return;
    }

    if(typeof data.id !== "string" || typeof data.currentTime !== "number")
           return;

    if(this.playlist.current === null) {
        return;
    }

    if(isLive(this.playlist.current.media.type)
        && this.playlist.current.media.type != "jw") {
        return;
    }

    if(this.playlist.current.media.id != data.id) {
        return;
    }

    this.playlist.current.media.currentTime = data.currentTime;
    this.playlist.current.media.paused = data.paused;
    this.sendAll("mediaUpdate", this.playlist.current.media.timeupdate());
}

Channel.prototype.move = function(data, user) {
    var chan = this;
    function afterMove() {
        var moveby = user && user.name ? user.name : null;
        if(typeof data.moveby !== "undefined")
            moveby = data.moveby;

        
        var fromit = chan.playlist.items.find(data.from);
        var afterit = chan.playlist.items.find(data.after);
        var aftertitle = afterit && afterit.media ? afterit.media.title : "";
        if(fromit) {
            chan.logger.log("### " + user.name + " moved " + fromit.media.title 
                          + (aftertitle ? " after " + aftertitle : ""));
        }

        chan.sendAll("moveVideo", {
            from: data.from,
            after: data.after,
            moveby: moveby
        });
    }

    this.playlist.move(data.from, data.after, afterMove);
}

Channel.prototype.tryMove = function(user, data) {
    if(!this.hasPermission(user, "playlistmove")) {
        return;
    }

    if(typeof data.from !== "number" || (typeof data.after !== "number" && typeof data.after !== "string"))
        return;

    this.move(data, user);
}

/* REGION Polls */

Channel.prototype.tryOpenPoll = function(user, data) {
    if(!this.hasPermission(user, "pollctl") && this.leader != user) {
        return;
    }

    if(!data.title || !data.opts) {
        return;
    }

    var poll = new Poll(user.name, data.title, data.opts);
    this.poll = poll;
    this.broadcastPoll();
    this.logger.log("*** " + user.name + " Opened Poll: '" + poll.title + "'");
}

Channel.prototype.tryClosePoll = function(user) {
    if(!this.hasPermission(user, "pollctl")) {
        return;
    }

    if(this.poll) {
        this.logger.log("*** " + user.name + " closed the active poll");
        this.poll = false;
        this.broadcastPollClose();
    }
}

Channel.prototype.tryVote = function(user, data) {

    if(!this.hasPermission(user, "pollvote")) {
        return;
    }
    if(typeof data.option !== "number") {
        return;
    }

    if(this.poll) {
        this.poll.vote(user.ip, data.option);
        this.broadcastPollUpdate();
    }
}

Channel.prototype.tryVoteskip = function(user) {
    if(!this.opts.allow_voteskip) {
        return;
    }
    // Voteskip = auto-unafk
    user.setAFK(false);
    user.autoAFK();
    if(!this.voteskip) {
        this.voteskip = new Poll("voteskip", "voteskip", ["yes"]);
    }
    this.voteskip.vote(user.ip, 0);
    this.logger.log("### " + user.name + " voteskipped");
    this.checkVoteskipPass();
}

Channel.prototype.checkVoteskipPass = function () {
    if(!this.opts.allow_voteskip)
        return false;

    if(!this.voteskip)
        return false;

    var count = this.users.length - this.afkers.length;
    var need = Math.ceil(count * this.opts.voteskip_ratio);
    if(this.server.cfg["debug"]) {
        console.log("afkers=", this.afkers.length);
        console.log("users =", this.users.length);
        console.log("DBG", this.voteskip.counts[0], "/", need);
    }
    if(this.voteskip.counts[0] >= need)
        this.playNext();

    this.broadcastVoteskipUpdate();
    return true;
}


/* REGION Channel Option stuff */

Channel.prototype.setLock = function(locked) {
    this.openqueue = !locked;
    this.sendAll("setPlaylistLocked", {locked: locked});
}

Channel.prototype.trySetLock = function(user, data) {
    if(!Rank.hasPermission(user, "qlock")) {
        return;
    }

    if(data.locked == undefined) {
        return;
    }

    this.logger.log("*** " + user.name + " set playlist lock to " + data.locked);
    this.setLock(data.locked);
}

Channel.prototype.tryToggleLock = function(user) {
    if(!Rank.hasPermission(user, "qlock")) {
        return;
    }

    this.logger.log("*** " + user.name + " set playlist lock to " + this.openqueue);
    this.setLock(this.openqueue);
}

Channel.prototype.tryRemoveFilter = function(user, f) {
    if(!this.hasPermission(user, "filteredit"))
        return false;

    this.logger.log("%%% " + user.name + " removed filter: " + f.name);
    this.removeFilter(f);
}

Channel.prototype.removeFilter = function(filter) {
    for(var i = 0; i < this.filters.length; i++) {
        if(this.filters[i].name == filter.name) {
            this.filters.splice(i, 1);
            break;
        }
    }
    this.broadcastChatFilters();
}

Channel.prototype.updateFilter = function(filter, emit) {
    if(filter.name == "")
        filter.name = filter.source;
    var found = false;
    for(var i = 0; i < this.filters.length; i++) {
        if(this.filters[i].name == filter.name) {
            found = true;
            this.filters[i] = filter;
            break;
        }
    }
    if(!found) {
        this.filters.push(filter);
    }
    if(emit !== false)
        this.broadcastChatFilters();
}

Channel.prototype.tryUpdateFilter = function(user, f) {
    if(!this.hasPermission(user, "filteredit")) {
        return;
    }

    var re = f.source;
    var flags = f.flags;
    // Temporary fix
    f.replace = f.replace.replace("style", "stlye");
    f.replace = sanitize(f.replace).xss();
    f.replace = f.replace.replace("stlye", "style");
    try {
        new RegExp(re, flags);
    }
    catch(e) {
        return;
    }
    var filter = new Filter(f.name, f.source, f.flags, f.replace);
    filter.active = f.active;
    filter.filterlinks = f.filterlinks;
    this.logger.log("%%% " + user.name + " updated filter: " + f.name);
    this.updateFilter(filter);
}

Channel.prototype.moveFilter = function(data) {
    if(data.from < 0 || data.to < 0 || data.from >= this.filters.length ||
        data.to > this.filters.length) {
        return;
    }
    var f = this.filters[data.from];
    var to = data.to > data.from ? data.to + 1 : data.to;
    var from =  data.to > data.from ? data.from : data.from + 1;
    this.filters.splice(to, 0, f);
    this.filters.splice(from, 1);
    this.broadcastChatFilters();
}

Channel.prototype.tryMoveFilter = function(user, data) {
    if(!this.hasPermission(user, "filteredit"))
        return;

    if(typeof data.to !== "number" || typeof data.from !== "number")
        return;
    this.moveFilter(data);
}

Channel.prototype.tryUpdatePermissions = function(user, perms) {
    if(!Rank.hasPermission(user, "channelperms")) {
        return;
    }
    for(var key in perms) {
        this.permissions[key] = perms[key];
    }
    this.logger.log("%%% " + user.name + " updated permissions");
    this.sendAll("setPermissions", this.permissions);
}

Channel.prototype.tryUpdateOptions = function(user, data) {
    if(!Rank.hasPermission(user, "channelOpts")) {
        return;
    }

    const adminonly = {
        pagetitle: true,
        externalcss: true,
        externaljs: true,
        show_public: true
    };

    if ("afk_timeout" in data) {
        data.afk_timeout = parseInt(data.afk_timeout);
        if(data.afk_timeout < 0)
            data.afk_timeout = 0;
    }

    for(var key in this.opts) {
        if(key in data) {
            if(key in adminonly && user.rank < Rank.Owner) {
                continue;
            }
            if(key === "afk_timeout" && this.opts[key] != data[key]) {
                this.users.forEach(function (u) {
                    u.autoAFK();
                });
            }
            this.opts[key] = data[key];
        }
    }

    this.logger.log("%%% " + user.name + " updated channel options");
    this.broadcastOpts();
}

Channel.prototype.trySetCSS = function(user, data) {
    if(!Rank.hasPermission(user, "setcss")) {
        return;
    }

    var css = data.css || "";
    if(css.length > 20000) {
        css = css.substring(0, 20000);
    }
    this.css = css;
    this.sendAll("channelCSSJS", {
        css: this.css,
        js: this.js
    });
    this.logger.log("%%% " + user.name + " set channel CSS");
}

Channel.prototype.trySetJS = function(user, data) {
    if(!Rank.hasPermission(user, "setjs")) {
        return;
    }

    var js = data.js || "";
    if(js.length > 20000) {
        js = js.substring(0, 20000);
    }
    this.js = js;
    this.sendAll("channelCSSJS", {
        css: this.css,
        js: this.js
    });
    this.logger.log("%%% " + user.name + " set channel JS");
}

Channel.prototype.updateMotd = function(motd) {
    var html = motd.replace(/\n/g, "<br>");
    // Temporary fix
    html = html.replace("style", "stlye");
    html = sanitize(html).xss();
    html = html.replace("stlye", "style");
    //html = this.filterMessage(html);
    this.motd = {
        motd: motd,
        html: html
    };
    this.broadcastMotd();
}

Channel.prototype.tryUpdateMotd = function(user, data) {
    if(!this.hasPermission(user, "motdedit")) {
        return;
    }

    data.motd = data.motd || "";
    this.updateMotd(data.motd);
    this.logger.log("%%% " + user.name + " set the MOTD");
}

/* REGION Chat */

Channel.prototype.tryChat = function(user, data) {
    if(user.name == "") {
        return;
    }

    if(!this.hasPermission(user, "chat"))
        return;

    if(user.muted) {
        user.socket.emit("noflood", {
            action: "chat",
            msg: "You have been muted on this channel."
        });
        return;
    }

    if(typeof data.msg !== "string") {
        return;
    }

    var msg = data.msg;
    if(msg.length > 240) {
        msg = msg.substring(0, 240);
    }
    if(this.opts.chat_antiflood && user.noflood("chat", 2.0)) {
        return;
    }

    this.chainMessage(user, msg);
}

Channel.prototype.chainMessage = function(user, msg, data) {
    if(msg.indexOf("/") == 0)
        ChatCommand.handle(this, user, msg, data);

    else if(msg.indexOf(">") == 0)
        this.sendMessage(user.name, msg, "greentext", data);

    else
        this.sendMessage(user.name, msg, "", data);
}

Channel.prototype.filterMessage = function(msg) {
    const link = /((?:(?:https?)|(?:ftp))(?::\/\/[0-9a-zA-Z\.]+(?::[0-9]+)?[^\s'"$]+))/g;
    var subs = msg.split(link);
    // Apply other filters
    for(var j = 0; j < subs.length; j++) {
        if(this.opts.enable_link_regex && subs[j].match(link)) {
            subs[j] = subs[j].replace(link, "<a href=\"$1\" target=\"_blank\">$1</a>");
            for(var i = 0; i < this.filters.length; i++) {
                if(!this.filters[i].filterlinks || !this.filters[i].active)
                    continue;
                subs[j] = this.filters[i].filter(subs[j]);
            }
            continue;
        }
        for(var i = 0; i < this.filters.length; i++) {
            if(!this.filters[i].active)
                continue;
            subs[j] = this.filters[i].filter(subs[j]);
        }
    }
    return subs.join("");
}

Channel.prototype.sendMessage = function(username, msg, msgclass, data) {
    // I don't want HTML from strangers
    msg = sanitize(msg).escape();
    msg = this.filterMessage(msg);
    var msgobj = {
        username: username,
        msg: msg,
        msgclass: msgclass,
        time: Date.now()
    };
    if(data) {
        for(var key in data) {
            msgobj[key] = data[key];
        }
    }
    this.sendAll("chatMsg", msgobj);
    this.chatbuffer.push(msgobj);
    if(this.chatbuffer.length > 15)
        this.chatbuffer.shift();
    var unescaped = sanitize(msg).entityDecode();
    this.logger.log("<" + username + "." + msgclass + "> " + unescaped);
};

/* REGION Rank stuff */

Channel.prototype.trySetRank = function(user, data) {
    if(!Rank.hasPermission(user, "promote"))
        return;

    if(typeof data.user !== "string" || typeof data.rank !== "number")
        return;

    if(data.rank >= user.rank)
        return;

    if(data.rank < 1)
        return;

    var receiver;
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == data.user) {
            receiver = this.users[i];
            break;
        }
    }

    if(receiver) {
        if(receiver.rank >= user.rank)
            return;
        receiver.rank = data.rank;
        if(receiver.loggedIn) {
            this.saveRank(receiver);
        }
        this.broadcastUserUpdate(receiver);
    }
    else {
        var rrank = this.getRank(data.user);
        if(rrank >= user.rank)
            return;
        this.server.db.setChannelRank(this.name, data.user, data.rank);
    }

    this.logger.log("*** " + user.name + " set " + data.user + "'s rank to " +
                    data.rank);
    this.sendAllWithPermission("acl", "setChannelRank", data);
}

Channel.prototype.tryPromoteUser = function(actor, data) {
    if(!Rank.hasPermission(actor, "promote")) {
        return;
    }

    if(data.name == undefined) {
        return;
    }

    var name = data.name;

    var receiver;
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == name) {
            receiver = this.users[i];
            break;
        }
    }

    var rank = receiver ? receiver.rank : this.getRank(data.name);

    if(actor.rank > rank + 1) {
        rank++;
        if(receiver) {
            receiver.rank++;
            if(receiver.loggedIn) {
                this.saveRank(receiver);
            }
            this.broadcastUserUpdate(receiver);
        }
        else {
            this.server.db.setChannelRank(this.name, data.name, rank);
        }
        this.logger.log("*** " + actor.name + " promoted " + data.name + " from " + (rank - 1) + " to " + rank);
        //this.broadcastRankTable();
    }
}

Channel.prototype.tryDemoteUser = function(actor, data) {
    if(!Rank.hasPermission(actor, "promote")) {
        return;
    }

    if(data.name == undefined) {
        return;
    }

    var name = data.name;
    var receiver;
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == name) {
            receiver = this.users[i];
            break;
        }
    }

    var rank = receiver ? receiver.rank : this.getRank(data.name);

    if(actor.rank > rank) {
        rank--;
        if(receiver) {
            receiver.rank--;
            if(receiver.loggedIn) {
                this.saveRank(receiver);
            }
            this.broadcastUserUpdate(receiver);
        }
        else {
            this.server.db.setChannelRank(this.name, data.name, rank);
        }
        this.logger.log("*** " + actor.name + " demoted " + data.name + " from " + (rank + 1) + " to " + rank);
        //this.broadcastRankTable();
    }
}

Channel.prototype.changeLeader = function(name) {
    if(this.leader != null) {
        var old = this.leader;
        this.leader = null;
        if(old.rank == 1.5) {
            old.rank = old.oldrank;
        }
        this.broadcastUserUpdate(old);
    }
    if(name == "") {
        this.logger.log("*** Resuming autolead");
        /*
        if(this.playlist.current != null && !isLive(this.playlist.current.media.type)) {
            this.playlist.current.media.paused = false;
            this.time = new Date().getTime();
            this.i = 0;
            mediaUpdate(this, this.playlist.current.media.id);
        }
        */
        this.playlist.lead(true);
        return;
    }
    for(var i = 0; i < this.users.length; i++) {
        if(this.users[i].name == name) {
            this.logger.log("*** Assigned leader: " + name);
            this.playlist.lead(false);
            this.leader = this.users[i];
            if(this.users[i].rank < 1.5) {
                this.users[i].oldrank = this.users[i].rank;
                this.users[i].rank = 1.5;
            }
            this.broadcastUserUpdate(this.leader);
        }
    }
}

Channel.prototype.tryChangeLeader = function(user, data) {
    if(!Rank.hasPermission(user, "assignLeader")) {
        return;
    }

    if(data.name == undefined) {
        return;
    }

    this.changeLeader(data.name);
    this.logger.log("### " + user.name + " assigned leader to " + data.name);
}

module.exports = Channel;