createCacheKey.js
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/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
import '../_version.js';
// Name of the search parameter used to store revision info.
const REVISION_SEARCH_PARAM = '__WB_REVISION__';
/**
* Converts a manifest entry into a versioned URL suitable for precaching.
*
* @param {Object|string} entry
* @return {string} A URL with versioning info.
*
* @private
* @memberof workbox-precaching
*/
export function createCacheKey(entry) {
if (!entry) {
throw new WorkboxError('add-to-cache-list-unexpected-type', { entry });
}
// If a precache manifest entry is a string, it's assumed to be a versioned
// URL, like '/app.abcd1234.js'. Return as-is.
if (typeof entry === 'string') {
const urlObject = new URL(entry, location.href);
return {
cacheKey: urlObject.href,
url: urlObject.href,
};
}
const { revision, url } = entry;
if (!url) {
throw new WorkboxError('add-to-cache-list-unexpected-type', { entry });
}
// If there's just a URL and no revision, then it's also assumed to be a
// versioned URL.
if (!revision) {
const urlObject = new URL(url, location.href);
return {
cacheKey: urlObject.href,
url: urlObject.href,
};
}
// Otherwise, construct a properly versioned URL using the custom Workbox
// search parameter along with the revision info.
const cacheKeyURL = new URL(url, location.href);
const originalURL = new URL(url, location.href);
cacheKeyURL.searchParams.set(REVISION_SEARCH_PARAM, revision);
return {
cacheKey: cacheKeyURL.href,
url: originalURL.href,
};
}