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47 lines
1.9 KiB
Text
47 lines
1.9 KiB
Text
/*
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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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import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
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import { logger } from 'workbox-core/_private/logger.js';
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import './_version.js';
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/**
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* Given two `Response's`, compares several header values to see if they are
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* the same or not.
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*
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* @param {Response} firstResponse
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* @param {Response} secondResponse
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* @param {Array<string>} headersToCheck
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* @return {boolean}
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*
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* @memberof workbox-broadcast-update
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*/
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const responsesAreSame = (firstResponse, secondResponse, headersToCheck) => {
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if (process.env.NODE_ENV !== 'production') {
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if (!(firstResponse instanceof Response && secondResponse instanceof Response)) {
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throw new WorkboxError('invalid-responses-are-same-args');
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}
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}
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const atLeastOneHeaderAvailable = headersToCheck.some((header) => {
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return (firstResponse.headers.has(header) && secondResponse.headers.has(header));
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});
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if (!atLeastOneHeaderAvailable) {
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if (process.env.NODE_ENV !== 'production') {
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logger.warn(`Unable to determine where the response has been updated ` +
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`because none of the headers that would be checked are present.`);
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logger.debug(`Attempting to compare the following: `, firstResponse, secondResponse, headersToCheck);
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}
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// Just return true, indicating the that responses are the same, since we
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// can't determine otherwise.
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return true;
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}
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return headersToCheck.every((header) => {
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const headerStateComparison = firstResponse.headers.has(header) === secondResponse.headers.has(header);
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const headerValueComparison = firstResponse.headers.get(header) === secondResponse.headers.get(header);
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return headerStateComparison && headerValueComparison;
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});
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};
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export { responsesAreSame };
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