87 lines
2.8 KiB
JavaScript
87 lines
2.8 KiB
JavaScript
'use strict';
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var _keys = require('babel-runtime/core-js/object/keys');
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var _keys2 = _interopRequireDefault(_keys);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/*
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Copyright 2017 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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var errors = require('./errors');
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/**
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* Escaping user input to be treated as a literal string within a regular
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* expression can be accomplished by simple replacement.
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*
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* From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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*
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* @private
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* @param {string} string The string to be used as part of a regular
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* expression
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* @return {string} A string that is safe to use in a regular
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* expression.
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*
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* @private
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*/
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var escapeRegExp = function escapeRegExp(string) {
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return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
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};
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module.exports = function (modifyUrlPrefix) {
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if (!modifyUrlPrefix || typeof modifyUrlPrefix !== 'object' || Array.isArray(modifyUrlPrefix)) {
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throw new Error(errors['modify-url-prefix-bad-prefixes']);
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}
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// If there are no entries in modifyUrlPrefix, just return an identity
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// function as a shortcut.
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if ((0, _keys2.default)(modifyUrlPrefix).length === 0) {
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return function (entry) {
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return entry;
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};
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}
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(0, _keys2.default)(modifyUrlPrefix).forEach(function (key) {
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if (typeof modifyUrlPrefix[key] !== 'string') {
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throw new Error(errors['modify-url-prefix-bad-prefixes']);
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}
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});
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// Escape the user input so it's safe to use in a regex.
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var safeModifyUrlPrefixes = (0, _keys2.default)(modifyUrlPrefix).map(escapeRegExp);
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// Join all the `modifyUrlPrefix` keys so a single regex can be used.
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var prefixMatchesStrings = safeModifyUrlPrefixes.join('|');
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// Add `^` to the front the prefix matches so it only matches the start of
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// a string.
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var modifyRegex = new RegExp(`^(${prefixMatchesStrings})`);
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return function (originalManifest) {
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var manifest = originalManifest.map(function (entry) {
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if (typeof entry.url !== 'string') {
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throw new Error(errors['manifest-entry-bad-url']);
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}
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entry.url = entry.url.replace(modifyRegex, function (match) {
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return modifyUrlPrefix[match];
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});
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return entry;
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});
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return { manifest };
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};
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}; |