express-cloudflare-ip
Version:
Tool to extract real ip for cloudflare reverse proxy
73 lines • 2.3 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.expressCloudflareIp = void 0;
const ip_range_check_1 = __importDefault(require("ip-range-check"));
const net_1 = __importDefault(require("net"));
const defaultExpressCloudflareOptions = (opts) => {
const defaultOpts = {
cloudflareHeader: "x-forwarded-for",
};
return Object.assign(defaultOpts, opts || {});
};
const sanitizeIfIpV4 = (ip) => {
if (typeof ip !== "string")
return ip;
if (ip.startsWith("::ffff:"))
return ip.slice(7);
return ip;
};
const extractRequestIp = (req) => {
return req.ip;
};
const fromCloudflare = (ip, family) => {
const cloudflareIpRanges = {
4: [
"103.21.244.0/22",
"103.22.200.0/22",
"103.31.4.0/22",
"104.16.0.0/13",
"104.24.0.0/14",
"108.162.192.0/18",
"131.0.72.0/22",
"141.101.64.0/18",
"162.158.0.0/15",
"172.64.0.0/13",
"173.245.48.0/20",
"188.114.96.0/20",
"190.93.240.0/20",
"197.234.240.0/22",
"198.41.128.0/17",
],
6: [
"2400:cb00::/32",
"2606:4700::/32",
"2803:f800::/32",
"2405:b500::/32",
"2405:8100::/32",
"2a06:98c0::/29",
"2c0f:f248::/32",
],
};
return !!(0, ip_range_check_1.default)(ip, cloudflareIpRanges[family.toString()]);
};
const expressCloudflareIp = (opts) => {
const fullOpts = defaultExpressCloudflareOptions(opts);
return (req, _res, next) => {
const ip = extractRequestIp(req);
const reqIp = sanitizeIfIpV4(ip);
if (!reqIp)
return next();
const ipFromCloudflare = req.header(fullOpts.cloudflareHeader);
const ipFamily = net_1.default.isIP(reqIp);
const fromCf = fromCloudflare(reqIp, ipFamily);
if (fromCf) {
req.cloudflareIp = ipFromCloudflare;
}
next();
};
};
exports.expressCloudflareIp = expressCloudflareIp;
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