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72 lines
2 KiB
Text
72 lines
2 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 = (
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firstResponse: Response,
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secondResponse: Response,
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headersToCheck: string[],
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): boolean => {
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if (process.env.NODE_ENV !== 'production') {
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if (
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!(firstResponse instanceof Response && secondResponse instanceof Response)
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) {
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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 (
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firstResponse.headers.has(header) && secondResponse.headers.has(header)
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);
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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(
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`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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);
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logger.debug(
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`Attempting to compare the following: `,
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firstResponse,
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secondResponse,
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headersToCheck,
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);
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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 =
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firstResponse.headers.has(header) === secondResponse.headers.has(header);
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const headerValueComparison =
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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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