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node-ddos-protector.js
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node-ddos-protector.js
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let fs = require("fs");
class DdosProtector {
constructor(){
this.individualUsers = [{ ip: "999.999.999.999", count: 1, }];
this.attackTimespan = 30;
this.attackCount = 20;
this.banTime = 7200;
this.bannedUsers = [];
this.errorCode = 429;
this.whitelist = null;
}
init(options = null){
if(options) {
this.attackTimespan = options.attackTimespan ? options.attackTimespan : this.attackTimespan;
this.attackCount = options.attackCount ? options.attackCount : this.attackCount;
this.banTime = options.banTime ? options.banTime : this.banTime;
this.errorCode = options.errorCode ? options.errorCode : this.errorCode;
}
return this;
}
handleBanningAndAllowing(req, res){
let anyRepeatedAttack = false;
let banEnded = false;
let userWhichReAllowed = null;
for(let i = 0; i < this.individualUsers.length; i++){
if(this.individualUsers[i].isBanned){
let now = new Date().getTime();
if(now > this.individualUsers[i].dateToBeBanned){
this.individualUsers[i].isBanned = false;
banEnded = true;
userWhichReAllowed = this.individualUsers[i];
} else {
this.banUser(req, res);
}
}
}
if(userWhichReAllowed){
this.individualUsers = this.individualUsers.filter(param => param.ip !== userWhichReAllowed.ip)
this.unBanUser(req, res, userWhichReAllowed.ip);
}
for(let i = 0; i < this.individualUsers.length; i++){
let now = new Date().getTime();
if((now > (this.individualUsers[i].startTime + (this.attackTimespan * 1000))) &&
this.individualUsers[i].count < this.attackCount){
this.individualUsers = this.individualUsers.filter(param => param.ip !== this.individualUsers[i].ip);
}
}
if(!banEnded){
for(let i = 0; i < this.individualUsers.length; i++){
if(this.individualUsers[i].ip === req.socket.remoteAddress){
if(!this.individualUsers[i].isBanned){
this.individualUsers[i].count = this.individualUsers[i].count + 1;
}
let now = new Date().getTime();
if(((this.individualUsers[i].count === this.attackCount) ||
(this.individualUsers[i].count > this.attackCount)) &&
(now - this.individualUsers[i].startTime) < (this.attackTimespan * 1000)){
this.individualUsers[i].isBanned = true;
this.individualUsers[i].count = 0;
this.individualUsers[i].dateToBeBanned = new Date().getTime() + (this.banTime * 1000);
this.banUser(req, res);
}
anyRepeatedAttack = true;
break;
}
}
}
if(!anyRepeatedAttack) {
if(this.whitelist !== null){
let listMemberFound = false;
for(let i = 0; i < this.whitelist.length; i++){
if(this.whitelist[i] === req.socket.remoteAddress){
listMemberFound = true;
break;
}
}
if(!listMemberFound){
this.individualUsers.push({ ip: req.socket.remoteAddress, count: 1, startTime: new Date().getTime(), isBanned: false, dateToBeBanned: null });
}
} else {
this.individualUsers.push({ ip: req.socket.remoteAddress, count: 1, startTime: new Date().getTime(), isBanned: false, dateToBeBanned: null });
}
}
return this;
}
banUser(req, res){
res.statusCode = this.errorCode;
res.setHeader("X-Ban-Reason", "Spamming")
}
unBanUser(req, res, userId){
res.statusCode = 200;
res.setHeader("X-Unban-User", userId)
}
openWhitelist(list){
this.whitelist = [];
if(Array.isArray(list)){
for(let i = 0; i < list.length; i++){
this.whitelist.push(list[i]);
}
}
if(typeof list === "string"){
fs.readFile(list, "utf8", function(err, data){
if(err){
console.log("Error when reading file: ", err)
}
let splitTheData = data.split("\n");
for(let i = 0; i < splitTheData.length; i++){
this.whitelist.push(splitTheData[i].trim())
}
}.bind(this));
}
return this;
}
logEverything(){
console.log("attack count: ", this.attackCount);
console.log("ban length: ", this.attackTimespan);
console.log("exact banned time as second: ", this.banTime)
console.log("counted users: ", this.individualUsers);
console.log("banned users: ", this.bannedUsers);
console.log("error code: ", this.errorCode);
}
}
module.exports = {
DdosProtector
}