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47 lines
1.9 KiB
47 lines
1.9 KiB
/* |
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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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