| 1 | /*
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| 2 | Copyright 2019 Google LLC
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| 3 |
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| 4 | Use of this source code is governed by an MIT-style
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| 5 | license that can be found in the LICENSE file or at
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| 6 | https://opensource.org/licenses/MIT.
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| 7 | */
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| 8 | import { canConstructResponseFromBodyStream } from './_private/canConstructResponseFromBodyStream.js';
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| 9 | import { WorkboxError } from './_private/WorkboxError.js';
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| 10 | import './_version.js';
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| 11 | /**
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| 12 | * Allows developers to copy a response and modify its `headers`, `status`,
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| 13 | * or `statusText` values (the values settable via a
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| 14 | * [`ResponseInit`]{@link https://developer.mozilla.org/en-US/docs/Web/API/Response/Response#Syntax}
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| 15 | * object in the constructor).
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| 16 | * To modify these values, pass a function as the second argument. That
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| 17 | * function will be invoked with a single object with the response properties
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| 18 | * `{headers, status, statusText}`. The return value of this function will
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| 19 | * be used as the `ResponseInit` for the new `Response`. To change the values
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| 20 | * either modify the passed parameter(s) and return it, or return a totally
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| 21 | * new object.
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| 22 | *
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| 23 | * This method is intentionally limited to same-origin responses, regardless of
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| 24 | * whether CORS was used or not.
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| 25 | *
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| 26 | * @param {Response} response
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| 27 | * @param {Function} modifier
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| 28 | * @memberof workbox-core
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| 29 | */
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| 30 | async function copyResponse(response, modifier) {
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| 31 | let origin = null;
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| 32 | // If response.url isn't set, assume it's cross-origin and keep origin null.
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| 33 | if (response.url) {
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| 34 | const responseURL = new URL(response.url);
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| 35 | origin = responseURL.origin;
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| 36 | }
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| 37 | if (origin !== self.location.origin) {
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| 38 | throw new WorkboxError('cross-origin-copy-response', { origin });
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| 39 | }
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| 40 | const clonedResponse = response.clone();
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| 41 | // Create a fresh `ResponseInit` object by cloning the headers.
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| 42 | const responseInit = {
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| 43 | headers: new Headers(clonedResponse.headers),
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| 44 | status: clonedResponse.status,
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| 45 | statusText: clonedResponse.statusText,
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| 46 | };
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| 47 | // Apply any user modifications.
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| 48 | const modifiedResponseInit = modifier ? modifier(responseInit) : responseInit;
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| 49 | // Create the new response from the body stream and `ResponseInit`
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| 50 | // modifications. Note: not all browsers support the Response.body stream,
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| 51 | // so fall back to reading the entire body into memory as a blob.
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| 52 | const body = canConstructResponseFromBodyStream()
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| 53 | ? clonedResponse.body
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| 54 | : await clonedResponse.blob();
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| 55 | return new Response(body, modifiedResponseInit);
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| 56 | }
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| 57 | export { copyResponse };
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