1 | 'use strict';
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2 | var token = '%[a-f0-9]{2}';
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3 | var singleMatcher = new RegExp(token, 'gi');
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4 | var multiMatcher = new RegExp('(' + token + ')+', 'gi');
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5 |
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6 | function decodeComponents(components, split) {
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7 | try {
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8 | // Try to decode the entire string first
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9 | return decodeURIComponent(components.join(''));
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10 | } catch (err) {
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11 | // Do nothing
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12 | }
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13 |
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14 | if (components.length === 1) {
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15 | return components;
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16 | }
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17 |
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18 | split = split || 1;
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19 |
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20 | // Split the array in 2 parts
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21 | var left = components.slice(0, split);
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22 | var right = components.slice(split);
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23 |
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24 | return Array.prototype.concat.call([], decodeComponents(left), decodeComponents(right));
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25 | }
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26 |
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27 | function decode(input) {
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28 | try {
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29 | return decodeURIComponent(input);
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30 | } catch (err) {
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31 | var tokens = input.match(singleMatcher);
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32 |
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33 | for (var i = 1; i < tokens.length; i++) {
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34 | input = decodeComponents(tokens, i).join('');
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35 |
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36 | tokens = input.match(singleMatcher);
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37 | }
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38 |
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39 | return input;
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40 | }
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41 | }
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42 |
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43 | function customDecodeURIComponent(input) {
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44 | // Keep track of all the replacements and prefill the map with the `BOM`
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45 | var replaceMap = {
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46 | '%FE%FF': '\uFFFD\uFFFD',
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47 | '%FF%FE': '\uFFFD\uFFFD'
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48 | };
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49 |
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50 | var match = multiMatcher.exec(input);
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51 | while (match) {
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52 | try {
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53 | // Decode as big chunks as possible
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54 | replaceMap[match[0]] = decodeURIComponent(match[0]);
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55 | } catch (err) {
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56 | var result = decode(match[0]);
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57 |
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58 | if (result !== match[0]) {
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59 | replaceMap[match[0]] = result;
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60 | }
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61 | }
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62 |
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63 | match = multiMatcher.exec(input);
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64 | }
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65 |
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66 | // Add `%C2` at the end of the map to make sure it does not replace the combinator before everything else
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67 | replaceMap['%C2'] = '\uFFFD';
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68 |
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69 | var entries = Object.keys(replaceMap);
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70 |
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71 | for (var i = 0; i < entries.length; i++) {
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72 | // Replace all decoded components
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73 | var key = entries[i];
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74 | input = input.replace(new RegExp(key, 'g'), replaceMap[key]);
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75 | }
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76 |
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77 | return input;
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78 | }
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79 |
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80 | module.exports = function (encodedURI) {
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81 | if (typeof encodedURI !== 'string') {
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82 | throw new TypeError('Expected `encodedURI` to be of type `string`, got `' + typeof encodedURI + '`');
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83 | }
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84 |
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85 | try {
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86 | encodedURI = encodedURI.replace(/\+/g, ' ');
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87 |
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88 | // Try the built in decoder first
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89 | return decodeURIComponent(encodedURI);
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90 | } catch (err) {
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91 | // Fallback to a more advanced decoder
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92 | return customDecodeURIComponent(encodedURI);
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93 | }
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94 | };
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