@libj/ip-filter/dist/makeIpFilterMiddleware.js

Ip filter utils (function, middleware)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.makeIpFilterMiddleware = void 0;
var isIpInRange_1 = require("./isIpInRange");
var src_1 = require("@libj/http-meta");
var constants_1 = require("./constants");
var makeIpFilterMiddleware = function (config) { return function (req, res, next) {
    var response = validateConfig(config).response, ip = defineIp(req, config);
    if (ip) {
        var isAllowed = isIpAllowed(ip, config);
        if (isAllowed) {
            return next();
        }
    }
    var statusCode = (response === null || response === void 0 ? void 0 : response.statusCode) || src_1.HttpStatus.FORBIDDEN, body = response === null || response === void 0 ? void 0 : response.body;
    logError(ip, config);
    res.status(statusCode);
    if (body) {
        res.send(body);
    }
    else {
        res.send();
    }
}; };
exports.makeIpFilterMiddleware = makeIpFilterMiddleware;
/*** Lib ***/
function defineIp(req, config) {
    var ipGetter = config.ipGetter;
    if (ipGetter) {
        return ipGetter(req);
    }
    return req.headers['x-forwarded-for'] || req.socket.remoteAddress || null;
}
function isIpAllowed(ip, config) {
    var whitelist = config.whitelist, blacklist = config.blacklist;
    if (whitelist) {
        return whitelist.indexOf(constants_1.WILDCARD_IP) > -1 ? true : (0, isIpInRange_1.isIpInRange)(ip, whitelist);
    }
    return !(0, isIpInRange_1.isIpInRange)(ip, blacklist);
}
function validateConfig(config) {
    if (!config.whitelist && !config.blacklist) {
        throw new Error('Missing whitelist or blacklist');
    }
    else if (config.whitelist && config.blacklist) {
        throw new Error('One of whitelist OR blacklist is supported in config');
    }
    return config;
}
function logError(ip, config) {
    var whitelist = config.whitelist, blacklist = config.blacklist, logger = config.logger;
    if (logger) {
        var errorArgs = void 0;
        if (ip) {
            var _a = whitelist ? ['whitelist', whitelist] : ['blacklist', blacklist], listLabel = _a[0], listValue = _a[1];
            errorArgs = [
                "Access denied to IP address '%s' according to ".concat(listLabel, " '%j'"),
                ip,
                listValue,
            ];
        }
        else {
            errorArgs = ['Access denied due to IP could not be defined'];
        }
        // @ts-ignore
        logger.error.apply(logger, errorArgs);
    }
}
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