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tells.js
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tells.js
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/**
* Tells
* Pokemon Showdown - http://pokemonshowdown.com/
*
* Tells are the offline messaging system for PS. They are received when a
* user successfully connects under a name that has tells waiting, and are
* sent when a pm is sent to a user who does not exist or is not online.
*
* Tells are cleared after they have existed for a certain length of time
* in order to remove any inactive messages. This length of time can be
* specified in config.js
*
* @license MIT license
*/
'use strict';
let fs = require('fs');
let tells = {inbox: {}, outbox: {}};
try {
tells = JSON.parse(fs.readFileSync('config/tells.json'));
} catch (e) {} // file doesn't exist (yet)
/**
* Purge expired messages from those stored
* @param threshold The age limit of an "old" tell, in ms
*/
let pruneOld = exports.pruneOld = function (threshold) {
let now = Date.now();
let receivers = Object.keys(Tells.inbox);
for (let i = 0; i < receivers.length; i++) {
for (let n = 0; n < Tells.inbox[receivers[i]].length; n++) {
if ((now - Tells.inbox[receivers[i]][n].time) >= threshold) {
let ips = Object.keys(Tells.inbox[receivers[i]][n].ips);
for (let ip = 0; ip < ips.length; ip++) {
if (Tells.outbox[ips[ip]]) Tells.outbox[ips[ip]]--;
if (Tells.outbox[ips[ip]] <= 0) delete Tells.outbox[ips[ip]];
}
Tells.inbox[receivers[i]].splice(n, 1);
n--;
}
}
if (!Tells.inbox[receivers[i]].length) delete Tells.inbox[receivers[i]];
}
Tells.writeTells();
};
exports.inbox = tells.inbox || {};
exports.outbox = tells.outbox || {};
/**
* Write the inbox and outbox to file
*/
exports.writeTells = (function () {
let writing = false;
let writePending = false; // whether or not a new write is pending
let finishWriting = function () {
writing = false;
if (writePending) {
writePending = false;
Tells.writeTells();
}
};
return function () {
if (writing) {
writePending = true;
return;
}
writing = true;
let data = JSON.stringify({inbox: Tells.inbox, outbox: Tells.outbox});
fs.writeFile('config/tells.json.0', data, function () {
// rename is atomic on POSIX, but will throw an error on Windows
fs.rename('config/tells.json.0', 'config/tells.json', function (err) {
if (err) {
// This should only happen on Windows.
fs.writeFile('config/tells.json', data, finishWriting);
return;
}
finishWriting();
});
});
};
})();
/**
* Format a user's inbox and send it on to the client to be delivered
* @param userid The userid whose tells to send
* @param user The User object to send the tells to
*/
exports.sendTell = function (userid, user) {
let buffer = '|raw|';
let tellsToSend = Tells.inbox[userid];
for (let i = 0; i < tellsToSend.length; i++) {
let ips = Object.keys(tellsToSend[i].ips);
for (let ip = 0; ip < ips.length; ip++) {
if (Tells.outbox[ips[ip]]) Tells.outbox[ips[ip]]--;
if (Tells.outbox[ips[ip]] <= 0) delete Tells.outbox[ips[ip]];
}
let timeStr = Tells.getTellTime(tellsToSend[i].time);
buffer += '<div class="chat"><font color="gray">[' + timeStr + ' ago]</font> ' + Server.nameColor(toId(tellsToSend[i].sender), true) + ':</font></b> ' + Chat.escapeHTML(tellsToSend[i].msg.replace(/\|/g, '|')) + '</div>';
}
user.send(buffer);
delete Tells.inbox[userid];
Tells.writeTells();
};
/**
* Store a tell to be received later
* @param sender The User object of the sender
* @param receiver The target userid
* @param msg The message to be send
* @return false if the receiver has a full inbox
* null if the sender has a full outbox
* otherwise true
*/
exports.addTell = function (sender, receiver, msg) {
if (Tells.inbox[receiver] && Tells.inbox[receiver].length >= 5) return false;
let ips = Object.keys(sender.ips);
for (let i = 0; i < ips.length; i++) {
if (!Tells.outbox[ips[i]]) {
Tells.outbox[ips[i]] = 1;
} else {
if (Tells.outbox[ips[i]] >= 10) return null;
Tells.outbox[ips[i]]++;
}
}
if (!Tells.inbox[receiver]) Tells.inbox[receiver] = [];
let newTell = {
'sender': sender.name,
time: Date.now(),
'msg': msg,
ips: sender.ips,
};
Tells.inbox[receiver].push(newTell);
Tells.writeTells();
return true;
};
/**
* Converts a UNIX timestamp into 'x minutes, y seconds ago' form
* @param time UNIX timestamp (e.g., 1405460769855)
* @return A human readable time difference between now and the given time
*/
exports.getTellTime = function (time) {
time = Date.now() - time;
time = Math.round(time / 1000); // rounds to nearest second
let seconds = time % 60;
let times = [];
if (seconds) times.push(String(seconds) + (seconds === 1 ? ' second' : ' seconds'));
let minutes, hours, days;
if (time >= 60) {
time = (time - seconds) / 60; // converts to minutes
minutes = time % 60;
if (minutes) times.unshift(String(minutes) + (minutes === 1 ? ' minute' : ' minutes'));
if (time >= 60) {
time = (time - minutes) / 60; // converts to hours
hours = time % 24;
if (hours) times.unshift(String(hours) + (hours === 1 ? ' hour' : ' hours'));
if (time >= 24) {
days = (time - hours) / 24; // you can probably guess this one
if (days) times.unshift(String(days) + (days === 1 ? ' day' : ' days'));
}
}
}
if (!times.length) times.push('0 seconds');
return times.join(', ');
};
// clear old messages every two hours
exports.pruneOldTimer = setInterval(pruneOld, 1000 * 60 * 60 * 2,
Config.tellsexpiryage || 1000 * 60 * 60 * 24 * 7);