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12 KiB
2 years ago
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{"version":3,"file":"workbox-range-requests.prod.js","sources":["../_version.js","../createPartialResponse.js","../utils/parseRangeHeader.js","../utils/calculateEffectiveBoundaries.js","../RangeRequestsPlugin.js"],"sourcesContent":["\"use strict\";\n// @ts-ignore\ntry {\n self['workbox:range-requests:6.5.2'] && _();\n}\ncatch (e) { }\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { assert } from 'workbox-core/_private/assert.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { calculateEffectiveBoundaries } from './utils/calculateEffectiveBoundaries.js';\nimport { parseRangeHeader } from './utils/parseRangeHeader.js';\nimport './_version.js';\n/**\n * Given a `Request` and `Response` objects as input, this will return a\n * promise for a new `Response`.\n *\n * If the original `Response` already contains partial content (i.e. it has\n * a status of 206), then this assumes it already fulfills the `Range:`\n * requirements, and will return it as-is.\n *\n * @param {Request} request A request, which should contain a Range:\n * header.\n * @param {Response} originalResponse A response.\n * @return {Promise<Response>} Either a `206 Partial Content` response, with\n * the response body set to the slice of content specified by the request's\n * `Range:` header, or a `416 Range Not Satisfiable` response if the\n * conditions of the `Range:` header can't be met.\n *\n * @memberof workbox-range-requests\n */\nasync function createPartialResponse(request, originalResponse) {\n try {\n if (process.env.NODE_ENV !== 'production') {\n assert.isInstance(request, Request, {\n moduleName: 'workbox-range-requests',\n funcName: 'createPartialResponse',\n paramName: 'request',\n });\n assert.isInstance(originalResponse, Response, {\n moduleName: 'workbox-range-requests',\n funcName: 'createPartialResponse',\n paramName: 'originalResponse',\n });\n }\n if (originalResponse.status === 206) {\n // If we already have a 206, then just pass it through as-is;\n // see https://github.com/GoogleChrome/workbox/issues/1720\n return originalResponse;\n }\n const rangeHeader = request.headers.get('range');\n if (!rangeHeader) {\n throw new WorkboxError('no-range-header');\n }\n const boundaries = parseRangeHeader(rangeHeader);\n const originalBlob = await originalResponse.blob();\n const effectiveBoundaries = calculateEffectiveBoundaries(originalBlob, boundaries.start, boundaries.end);\n const slicedBlob = originalBlob.slice(effectiveBoundaries.start, effectiveBoundaries.end);\n const slicedBlobSize = slicedBlob.size;\n const slicedResponse = new Response(slicedBlob, {\n // Status code 206 is for a Partial Content response.\n // See https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206\n status: 206,\n statusText: 'Partial Content',\n headers: originalResponse.headers,\n });\n slicedResponse.headers.set('Content-Length', String(slicedBlobSize));\n slicedResponse.headers.set('Content-Range', `bytes ${effectiveBoundaries.start}-${effectiveBoundaries.end - 1}/` +\n `${originalBlob.size}`);\n return slicedResponse;\n }\n catch (error) {\n if (process.env.NODE_ENV !== 'production') {\n logger.warn(`Unable to construct a partial response; returning a ` +\n `416 Range Not Satisfiable response instead.`);\n logger.groupCollapsed(`View details here.`);\n logger.log(error);\n logger.log(request);\n logger.log(originalResponse);\n logger.groupEnd();\n }\n
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