108 lines
2.1 KiB
JavaScript
108 lines
2.1 KiB
JavaScript
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var URL = require('url');
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var isValid = require('./is-valid.js');
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/**
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* Utility to cleanup the base host value. Also removes url fragments.
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*
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* Works for:
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* - hostname
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* - //hostname
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* - scheme://hostname
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* - scheme+scheme://hostname
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*
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* @param {string} value
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* @return {String}
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*/
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// scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
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var hasPrefixRE = /^(([a-z][a-z0-9+.-]*)?:)?\/\//;
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/**
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* @see https://github.com/oncletom/tld.js/issues/95
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*
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* @param {string} value
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*/
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function trimTrailingDots(value) {
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if (value[value.length - 1] === '.') {
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return value.substr(0, value.length - 1);
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}
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return value;
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}
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/**
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* Fast check to avoid calling `trim` when not needed.
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*
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* @param {string} value
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*/
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function checkTrimmingNeeded(value) {
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return (
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value.length > 0 && (
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value.charCodeAt(0) <= 32 ||
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value.charCodeAt(value.length - 1) <= 32
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)
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);
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}
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/**
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* Fast check to avoid calling `toLowerCase` when not needed.
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*
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* @param {string} value
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*/
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function checkLowerCaseNeeded(value) {
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for (var i = 0; i < value.length; i += 1) {
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var code = value.charCodeAt(i);
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if (code >= 65 && code <= 90) { // [A-Z]
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return true;
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}
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}
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return false;
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}
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module.exports = function extractHostname(value) {
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// First check if `value` is already a valid hostname.
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if (isValid(value)) {
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return trimTrailingDots(value);
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}
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var url = value;
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if (typeof url !== 'string') {
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url = '' + url;
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}
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var needsTrimming = checkTrimmingNeeded(url);
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if (needsTrimming) {
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url = url.trim();
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}
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var needsLowerCase = checkLowerCaseNeeded(url);
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if (needsLowerCase) {
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url = url.toLowerCase();
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}
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// Try again after `url` has been transformed to lowercase and trimmed.
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if ((needsLowerCase || needsTrimming) && isValid(url)) {
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return trimTrailingDots(url);
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}
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// Proceed with heavier url parsing to extract the hostname.
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if (!hasPrefixRE.test(url)) {
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url = '//' + url;
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}
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var parts = URL.parse(url, null, true);
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if (parts.hostname) {
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return trimTrailingDots(parts.hostname);
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}
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return null;
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};
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