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15 lines
288 B
JavaScript
15 lines
288 B
JavaScript
'use strict';
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module.exports = function (url) {
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if (typeof url !== 'string') {
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throw new TypeError('Expected a string, got ' + typeof url);
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}
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url = url.trim();
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if (/^\.*\/|^(?!localhost)\w+:/.test(url)) {
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return url;
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}
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return url.replace(/^(?!(?:\w+:)?\/\/)/, 'http://');
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};
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