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52 lines
2.0 KiB
52 lines
2.0 KiB
2 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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Object.defineProperty(exports, "__esModule", { value: true });
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exports.modifyURLPrefixTransform = void 0;
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const errors_1 = require("./errors");
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const escape_regexp_1 = require("./escape-regexp");
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function modifyURLPrefixTransform(modifyURLPrefix) {
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if (!modifyURLPrefix ||
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typeof modifyURLPrefix !== 'object' ||
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Array.isArray(modifyURLPrefix)) {
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throw new Error(errors_1.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 (Object.keys(modifyURLPrefix).length === 0) {
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return (manifest) => {
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return { manifest };
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};
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}
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for (const key of Object.keys(modifyURLPrefix)) {
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if (typeof modifyURLPrefix[key] !== 'string') {
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throw new Error(errors_1.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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const safeModifyURLPrefixes = Object.keys(modifyURLPrefix).map(escape_regexp_1.escapeRegExp);
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// Join all the `modifyURLPrefix` keys so a single regex can be used.
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const 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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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_1.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 { manifest };
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};
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}
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exports.modifyURLPrefixTransform = modifyURLPrefixTransform;
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