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69 lines
2.1 KiB
69 lines
2.1 KiB
4 years ago
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"use strict";
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/*
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Copyright 2018 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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const 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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const escapeRegExp = string => {
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return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
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};
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module.exports = 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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} // If there are no entries in modifyURLPrefix, just return an identity
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// function as a shortcut.
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if (Object.keys(modifyURLPrefix).length === 0) {
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return entry => entry;
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}
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Object.keys(modifyURLPrefix).forEach(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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}); // Escape the user input so it's safe to use in a regex.
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const safeModifyURLPrefixes = Object.keys(modifyURLPrefix).map(escapeRegExp); // Join all the `modifyURLPrefix` keys so a single regex can be used.
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const prefixMatchesStrings = safeModifyURLPrefixes.join('|'); // Add `^` to the front the prefix matches so it only matches the start of
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// a string.
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const modifyRegex = new RegExp(`^(${prefixMatchesStrings})`);
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return originalManifest => {
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const manifest = originalManifest.map(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, 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 {
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manifest
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};
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};
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};
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