94 lines
2.2 KiB
JavaScript
94 lines
2.2 KiB
JavaScript
'use strict';
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var token = '%[a-f0-9]{2}';
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var singleMatcher = new RegExp(token, 'gi');
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var multiMatcher = new RegExp('(' + token + ')+', 'gi');
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function decodeComponents(components, split) {
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try {
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// Try to decode the entire string first
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return decodeURIComponent(components.join(''));
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} catch (err) {
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// Do nothing
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}
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if (components.length === 1) {
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return components;
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}
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split = split || 1;
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// Split the array in 2 parts
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var left = components.slice(0, split);
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var right = components.slice(split);
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return Array.prototype.concat.call([], decodeComponents(left), decodeComponents(right));
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}
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function decode(input) {
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try {
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return decodeURIComponent(input);
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} catch (err) {
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var tokens = input.match(singleMatcher);
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for (var i = 1; i < tokens.length; i++) {
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input = decodeComponents(tokens, i).join('');
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tokens = input.match(singleMatcher);
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}
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return input;
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}
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}
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function customDecodeURIComponent(input) {
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// Keep track of all the replacements and prefill the map with the `BOM`
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var replaceMap = {
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'%FE%FF': '\uFFFD\uFFFD',
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'%FF%FE': '\uFFFD\uFFFD'
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};
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var match = multiMatcher.exec(input);
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while (match) {
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try {
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// Decode as big chunks as possible
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replaceMap[match[0]] = decodeURIComponent(match[0]);
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} catch (err) {
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var result = decode(match[0]);
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if (result !== match[0]) {
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replaceMap[match[0]] = result;
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}
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}
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match = multiMatcher.exec(input);
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}
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// Add `%C2` at the end of the map to make sure it does not replace the combinator before everything else
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replaceMap['%C2'] = '\uFFFD';
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var entries = Object.keys(replaceMap);
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for (var i = 0; i < entries.length; i++) {
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// Replace all decoded components
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var key = entries[i];
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input = input.replace(new RegExp(key, 'g'), replaceMap[key]);
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}
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return input;
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}
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module.exports = function (encodedURI) {
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if (typeof encodedURI !== 'string') {
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throw new TypeError('Expected `encodedURI` to be of type `string`, got `' + typeof encodedURI + '`');
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}
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try {
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encodedURI = encodedURI.replace(/\+/g, ' ');
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// Try the built in decoder first
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return decodeURIComponent(encodedURI);
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} catch (err) {
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// Fallback to a more advanced decoder
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return customDecodeURIComponent(encodedURI);
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}
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};
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