P42_wssGateway/actions/chat.js

module.exports.methods = {

    /*  Creates (predictable) peer-to-peer chan if necessary, or check for lobby existence, then subscribe to it.
        Request:
        {
            "action": "STARTCHAT",
            "payload": "P" // or "C" => "P" = Peer-to-peer, "C" = (chat) Channel
        }
        reply:
        {
            "action": "STARTCHAT",
            "success": true,
            "payload" : "dynamically created chan"
        }
    */
    action_STARTCHAT(action, payload, reqid){
        if(typeof(payload)!='string'){
            this.sendErr(action, 'Invalid payload', reqid);
            return;
        };
        let recipientId = payload.substring(2);
        let chan;
        if(payload[0]=='P') {
            chan = (this.userId<recipientId) ? 'userchans:'+this.userId+'|'+recipientId : 'userchans:'+recipientId+'|'+this.userId;
        } else if(payload[0]=='C') {
            chan = 'lobbies:'+recipientId;
        } else {
            this.sendErr(action, 'Bad chat destination', reqid);
            return;
        } 
        // subscribe this connexion 
        if(!(chan in this.rediscnx.subscriptions)) this.rediscnx.subscriptions[chan] = [];
        if(this.rediscnx.subscriptions[chan].indexOf(this.uuid)<0) {
            this.rediscnx.subscriptions[chan].push(this.uuid);  
            if(this.debug) console.log('Subscribed to chat chan: ',chan);                  
        }
        // other connexion of this user might be on different chat, so don't subscribe them
        let reply = {
            'action': action,
            'payload': chan,
            'success': true,
        };
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));   
    },

    /*  Send human-message in chat chan.
        Request:
        {
            "action": "SENDCHAT",
            "payload": "P" // or "C" => "P" = Peer-to-peer, "C" = (chat) Channel
        }
        reply:
        {
            "action": "SENDCHAT",
            "success": true,
            "payload" : null
        }
    */
    action_SENDCHAT(action, payload, reqid){
        //TODO: prevent unauthorized recipient !!
        let recipientId = payload.recipient.substring(2);
        let chan;
        payload.event = 'CHATMSG'
        if(payload.recipient[0]=='P') {
            chan = (this.userId<recipientId) ? 'userchans:'+this.userId+'|'+recipientId : 'userchans:'+recipientId+'|'+this.userId;
        } else if(payload.recipient[0]=='C') {
            chan = 'lobbies:'+recipientId;
        } else {
            this.sendErr(action, 'Bad chat destination', reqid);
            return;
        } 
        if(this.debug) console.log('Publishing to chat chan: ',chan, payload.msg);

//NIKE TODO: be coherent, 'sender' is app-level, therefore should be inside payload, not outside  !!!
// (see remark in Protocol description in FE MessageBus class)

        this.rediscnx.redisPublish(chan, {            
            'sender': this.userId, 
            'msg' : payload.msg 
        });
        let reply = {
            'action': action,
            'payload': null,
            'success': true,
        };
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));   
    },

    /*  Send human-message in chat chan.
        Request:
        {
            "action": "ISONLINE",
            "payload": "P" // or "C" => "P" = Peer-to-peer, "C" = (chat) Channel
        }
        reply:
        {
            "action": "ISONLINE",
            "success": true,
            "payload" : 
        }
    */
    // You can only ask the satus of a list of usernames you know (and have the right to)
    action_ISONLINE(action, payload, reqid){
        //TODO: can you really ask about those users ? (but that might cost too much time, because => ML?)
        if(!Array.isArray(payload)){
            this.sendErr(action, 'Invalid payload', reqid);
            return;
        };
        let onlineUsers = Object.keys(this.wssSrv.getOnlineUsers());
        let reply = {
            'action': action,
            'payload': payload.filter((x) => (onlineUsers.indexOf(x)>-1)),
            'success': true,
        };   
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));
    },

    // Same as ISONLINE, but subscribe to watch changes
    action_WATCHUSERS(action, payload, reqid){
        if(!Array.isArray(payload)){
            this.sendErr(action, 'Invalid payload', reqid);
            return;            
        }
        //TODO: can you really ask about those users ? (but that might cost too much time, because => ML?)
        this.usersWatched = payload;
        let reply = {
            'action': action,
            'payload': null,
            'success': true,
        };   
        if(reqid) reply.reqid = reqid;
        this.send(JSON.stringify(reply));   
    },   

 /*        
        Request:
        {
            "action": "CHANLST",
            "payload": { "filter": "ChatRoom*" }
        }
        reply:
        {
            "action": "CHANLST",
            "success": true,
            "payload" : ["ChatRoom1","ChatRoom2","ChatRoom_Experts"]
        }
    */ 
        action_CHANLST(action, payload, reqid){
            //TODO : Filter based on user rights!!
            // 
            let reply = {
                'action': action,
                'payload': [
                    this.config.redis.basePrefix+"onlineUsers", 
                    this.config.redis.basePrefix+"system:chan1", 
                    this.config.redis.basePrefix+"proposals:updates" 
                ],//this.config.redis.watchChannels,
                'success': true,
            };   
            if(reqid) reply.reqid = reqid;
            this.send(JSON.stringify(reply));           
        },
   
}