107 lines
3.5 KiB
JavaScript
107 lines
3.5 KiB
JavaScript
/*
|
|
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.mjs';
|
|
import {assert} from 'workbox-core/_private/assert.mjs';
|
|
import {logger} from 'workbox-core/_private/logger.mjs';
|
|
|
|
import {calculateEffectiveBoundaries} from
|
|
'./utils/calculateEffectiveBoundaries.mjs';
|
|
import {parseRangeHeader} from './utils/parseRangeHeader.mjs';
|
|
|
|
import './_version.mjs';
|
|
|
|
/**
|
|
* Given a `Request` and `Response` objects as input, this will return a
|
|
* promise for a new `Response`.
|
|
*
|
|
* If the original `Response` already contains partial content (i.e. it has
|
|
* a status of 206), then this assumes it already fulfills the `Range:`
|
|
* requirements, and will return it as-is.
|
|
*
|
|
* @param {Request} request A request, which should contain a Range:
|
|
* header.
|
|
* @param {Response} originalResponse A response.
|
|
* @return {Promise<Response>} Either a `206 Partial Content` response, with
|
|
* the response body set to the slice of content specified by the request's
|
|
* `Range:` header, or a `416 Range Not Satisfiable` response if the
|
|
* conditions of the `Range:` header can't be met.
|
|
*
|
|
* @memberof workbox.rangeRequests
|
|
*/
|
|
async function createPartialResponse(request, originalResponse) {
|
|
try {
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
assert.isInstance(request, Request, {
|
|
moduleName: 'workbox-range-requests',
|
|
funcName: 'createPartialResponse',
|
|
paramName: 'request',
|
|
});
|
|
|
|
assert.isInstance(originalResponse, Response, {
|
|
moduleName: 'workbox-range-requests',
|
|
funcName: 'createPartialResponse',
|
|
paramName: 'originalResponse',
|
|
});
|
|
}
|
|
|
|
if (originalResponse.status === 206) {
|
|
// If we already have a 206, then just pass it through as-is;
|
|
// see https://github.com/GoogleChrome/workbox/issues/1720
|
|
return originalResponse;
|
|
}
|
|
|
|
const rangeHeader = request.headers.get('range');
|
|
if (!rangeHeader) {
|
|
throw new WorkboxError('no-range-header');
|
|
}
|
|
|
|
const boundaries = parseRangeHeader(rangeHeader);
|
|
const originalBlob = await originalResponse.blob();
|
|
|
|
const effectiveBoundaries = calculateEffectiveBoundaries(
|
|
originalBlob, boundaries.start, boundaries.end);
|
|
|
|
const slicedBlob = originalBlob.slice(effectiveBoundaries.start,
|
|
effectiveBoundaries.end);
|
|
const slicedBlobSize = slicedBlob.size;
|
|
|
|
const slicedResponse = new Response(slicedBlob, {
|
|
// Status code 206 is for a Partial Content response.
|
|
// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206
|
|
status: 206,
|
|
statusText: 'Partial Content',
|
|
headers: originalResponse.headers,
|
|
});
|
|
|
|
slicedResponse.headers.set('Content-Length', slicedBlobSize);
|
|
slicedResponse.headers.set('Content-Range',
|
|
`bytes ${effectiveBoundaries.start}-${effectiveBoundaries.end - 1}/` +
|
|
originalBlob.size);
|
|
|
|
return slicedResponse;
|
|
} catch (error) {
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
logger.warn(`Unable to construct a partial response; returning a ` +
|
|
`416 Range Not Satisfiable response instead.`);
|
|
logger.groupCollapsed(`View details here.`);
|
|
logger.log(error);
|
|
logger.log(request);
|
|
logger.log(originalResponse);
|
|
logger.groupEnd();
|
|
}
|
|
|
|
return new Response('', {
|
|
status: 416,
|
|
statusText: 'Range Not Satisfiable',
|
|
});
|
|
}
|
|
}
|
|
|
|
export {createPartialResponse};
|