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#!/usr/bin/env node
const firebase_app=require("firebase-admin/app")
const firebase_messaging=require("firebase-admin/messaging")
const util=require("util");
// Potential TODO's:
// - Use collapseKey to collect notifications for particular rooms
// - But note that you cannot have more than 4 collapseKeys at a time;
// correctly managing this requires synchronisation between app and server
// of exactly what keys have disappeared in the meantime
firebase_app.initializeApp({
credential:firebase_app.cert(require("./firebaseServiceAccountKey.json")),
databaseURL:"https://tomsg-83196.firebaseio.com",
});
const fieldConverters=new Map([
["token",(b)=>b.toString()],
["user",(b)=>b.toString()],
["to_user",(b)=>b.toString()],
["room",(b)=>b.toString()],
["message",(b)=>b.toString()],
["timestamp",(b)=>b.toString()], // Nanosecond timestamps are too close to 52-bit range
["online",(b)=>parseInt(b.toString(),10)],
]);
function typeConvertFields(fields){
for(const key of fields.keys()){
const conv=fieldConverters.get(key);
if(conv!=undefined)fields.set(key,conv(fields.get(key)));
}
}
function readFields(buffer){
const fields=new Map();
if(buffer.length==0)return fields;
let cursor=0;
while(true){
let idx=buffer.indexOf(32,cursor);
if(idx==-1){
console.error("ERR: Incomplete field in input line");
return null;
}
const key=String(buffer.slice(cursor,idx));
cursor=idx+1;
idx=buffer.indexOf(32,cursor);
if(idx==-1){
console.error("ERR: Incomplete field in input line");
return null;
}
const arglen=parseInt(String(buffer.slice(cursor,idx)),10);
if(arglen<0||arglen==null||isNaN(arglen)){
console.error("ERR: Invalid length in input line");
return null;
}
cursor=idx+1;
if(cursor+arglen>buffer.length){
console.error("ERR: Length larger than remaining line in input line");
return null;
}
const arg=buffer.slice(cursor,cursor+arglen);
cursor+=arglen;
fields.set(key,arg);
if(cursor==buffer.length)break;
if(buffer[cursor]!=32){
console.error("ERR: No space after argument in input line");
return null;
}
cursor++;
}
return fields;
}
function processMessage(type,fields){
switch(type){
case "message":
const user=fields.get("user");
const to_user=fields.get("to_user");
const room=fields.get("room");
const message=fields.get("message");
const token=fields.get("token");
const payload={
notification: {
title: room + " (" + user + ")",
body: message,
},
data: {
user: user,
room: room,
message: message,
}
};
const options={
collapseKey: "tomsg-collapseKey",
};
firebase_messaging.getMessaging().sendToDevice(token,payload,options)
.then((response)=>{
const result=response.results[0];
const realToken=result.canonicalRegistrationToken;
if(result.error){
console.error("JS: Send error:",result.error.errorInfo);
console.log("delete_token "+to_user+" "+token);
} else if(realToken&&realToken!=token){
console.log("delete_token "+to_user+" "+token);
console.log("add_token "+to_user+" "+realToken);
}
})
.catch((err)=>{
console.error("JS: Early send error:",err);
});
break;
default:
console.error("JS: Unknown type '"+type+"'");
}
}
function handleInputLine(buffer){
let idx=buffer.indexOf(32);
if(idx==-1){
console.error("ERR: No space in input line");
return;
}
const type=String(buffer.slice(0,idx));
const fields=readFields(buffer.slice(idx+1));
if(fields==null)return;
typeConvertFields(fields);
processMessage(type,fields);
}
{
let buffer=null;
process.stdin.on("data",(data)=>{
const prevlen=buffer==null?0:buffer.length;
if(buffer)buffer=Buffer.concat([buffer,data]);
else buffer=data;
let cursor=0;
let lfidx=buffer.indexOf(10,prevlen);
while(lfidx!=-1){
handleInputLine(buffer.slice(cursor,lfidx));
cursor=lfidx+1;
lfidx=buffer.indexOf(10,cursor);
}
if(cursor>=buffer.length)buffer=null;
else buffer=Buffer.from(buffer.slice(cursor));
});
}
console.error("Firebase js plugin loaded!");
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