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