is-web-crawler/dist/web-crawler-service.js

A light weight JS library to check if a user agent is a web crawler.

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
exports.__esModule = true;
exports.WebCrawlerService = void 0;
var crawler_user_agents_1 = __importDefault(require("crawler-user-agents"));
var WebCrawlerService = /** @class */ (function () {
    function WebCrawlerService() {
        this.cache = {};
    }
    WebCrawlerService.prototype.isCrawlerUserAgent = function (topCrawlersToCheck) {
        var cacheKey = "" + (topCrawlersToCheck || '');
        if (cacheKey in this.cache) {
            return this.cache[cacheKey];
        }
        return this.isCrawler(window.navigator.userAgent, topCrawlersToCheck);
    };
    WebCrawlerService.prototype.isCrawler = function (userAgent, topCrawlersToCheck) {
        return Boolean(this.getCrawler(userAgent, topCrawlersToCheck));
    };
    WebCrawlerService.prototype.getCrawler = function (userAgent, max) {
        var len = max ? Math.min(crawler_user_agents_1["default"].length, max) : crawler_user_agents_1["default"].length;
        for (var i = 0; i < len; i++) {
            var entry = crawler_user_agents_1["default"][i];
            if (RegExp(entry.pattern).test(userAgent)) {
                return entry;
            }
        }
        return null;
    };
    return WebCrawlerService;
}());
exports.WebCrawlerService = WebCrawlerService;