express-user-agent-blocker/lib/modules/buildUaBlockRegex.js

Express middleware for blocking access based on User Agent

Object.defineProperty(exports, "__esModule", { value: true });
exports.buildUaBlockRegex = void 0;
const _1 = require("./");
/**
 * Builds the regex to test UAs against
 * @param {string[]} userAgentToBlock - one or more (partial) User Agent strings to block
 * @param {Options} [options] - optional options which may contain custom log function
 * @return {RegExp|null} the regex to test against, or null if invalid input provided
 */
const buildUaBlockRegex = (userAgentToBlock, options) => {
    const log = _1.getLogger('euab:buildUaBlockRegex', options);
    if (userAgentToBlock.join('').trim().length > 0) {
        const blockRegex = new RegExp(`^.*(${userAgentToBlock.join('|').toLowerCase()}).*$`);
        log(`created blocked regex: ${blockRegex}`);
        return blockRegex;
    }
    log(`!!! could not create regex from '${userAgentToBlock}' - middleware will call 'next' on all requests`);
    return null;
};
exports.buildUaBlockRegex = buildUaBlockRegex;