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