@redocly/theme/lib/core/utils/is-url.js

Shared UI components lib

"use strict";
/**
 * RegExps.
 * A URL must match #1 and then at least one of #2/#3.
 * Use two levels of REs to avoid REDOS.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.isUrl = isUrl;
const protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
const localhostDomainRE = /^localhost[:?\d]*(?:[^:?\d]\S*)?$/;
const nonLocalhostDomainRE = /^[^\s.]+\.\S{2,}$/;
/**
 * Loosely validate a URL `string`.
 *
 * @param {String} input
 * @return {Boolean}
 */
function isUrl(input) {
    if (typeof input !== 'string') {
        return false;
    }
    const match = input.match(protocolAndDomainRE);
    if (!match) {
        return false;
    }
    const everythingAfterProtocol = match[1];
    if (!everythingAfterProtocol) {
        return false;
    }
    if (localhostDomainRE.test(everythingAfterProtocol) ||
        nonLocalhostDomainRE.test(everythingAfterProtocol)) {
        return true;
    }
    return false;
}
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