"use strict";

if (!fs.existsSync(path)) {

throw new Error("Not found ip range file of telegram.");

}

iplist = [];

var iplistFileContent = fs.readFileSync(path).toString();

for (let ipRange of iplistFileContent.split("\n")) {

ipRange = ipRange.trim();

var ip = ipRange.substring(0, ipRange.indexOf("/"));

var ipArray = new Buffer(ip.split("."));

if (ipArray.length !== 4) continue;

var ipLong = ipArray.readInt32BE(0);

var netmask = parseInt(ipRange.substring(ipRange.indexOf("/") + 1, ipRange.length));

var range = 2 << (32 - netmask - 1);

iplist.push({

start: ipLong,

end: ipLong + range

})

}

var ipArray = new Buffer(str.split("."));

var ipLong = ipArray.readInt32BE(0);

for (var range of iplist) {

if (ipLong >= range.start && ipLong <= range.end) {

return true;

}

}

return false;