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48 lines
856 B
JavaScript
48 lines
856 B
JavaScript
6 years ago
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/**
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* Expose `isUrl`.
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*/
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module.exports = isUrl;
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/**
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* RegExps.
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* A URL must match #1 and then at least one of #2/#3.
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* Use two levels of REs to avoid REDOS.
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*/
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var protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
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var localhostDomainRE = /^localhost[\:?\d]*(?:[^\:?\d]\S*)?$/
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var nonLocalhostDomainRE = /^[^\s\.]+\.\S{2,}$/;
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/**
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* Loosely validate a URL `string`.
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*
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* @param {String} string
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* @return {Boolean}
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*/
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function isUrl(string){
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if (typeof string !== 'string') {
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return false;
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}
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var match = string.match(protocolAndDomainRE);
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if (!match) {
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return false;
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}
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var everythingAfterProtocol = match[1];
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if (!everythingAfterProtocol) {
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return false;
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}
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if (localhostDomainRE.test(everythingAfterProtocol) ||
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nonLocalhostDomainRE.test(everythingAfterProtocol)) {
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return true;
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}
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return false;
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}
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