64 lines
2.2 KiB
JavaScript
64 lines
2.2 KiB
JavaScript
/*
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Copyright 2017 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';
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import {assert} from 'workbox-core/_private/assert.mjs';
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import '../_version.mjs';
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/**
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* @param {string} rangeHeader A Range: header value.
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* @return {Object} An object with `start` and `end` properties, reflecting
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* the parsed value of the Range: header. If either the `start` or `end` are
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* omitted, then `null` will be returned.
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*
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* @private
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*/
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function parseRangeHeader(rangeHeader) {
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if (process.env.NODE_ENV !== 'production') {
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assert.isType(rangeHeader, 'string', {
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moduleName: 'workbox-range-requests',
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funcName: 'parseRangeHeader',
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paramName: 'rangeHeader',
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});
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}
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const normalizedRangeHeader = rangeHeader.trim().toLowerCase();
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if (!normalizedRangeHeader.startsWith('bytes=')) {
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throw new WorkboxError('unit-must-be-bytes', {normalizedRangeHeader});
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}
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// Specifying multiple ranges separate by commas is valid syntax, but this
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// library only attempts to handle a single, contiguous sequence of bytes.
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Range#Syntax
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if (normalizedRangeHeader.includes(',')) {
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throw new WorkboxError('single-range-only', {normalizedRangeHeader});
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}
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const rangeParts = /(\d*)-(\d*)/.exec(normalizedRangeHeader);
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// We need either at least one of the start or end values.
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if (rangeParts === null || !(rangeParts[1] || rangeParts[2])) {
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throw new WorkboxError('invalid-range-values', {normalizedRangeHeader});
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}
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return {
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start: rangeParts[1] === '' ? null : Number(rangeParts[1]),
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end: rangeParts[2] === '' ? null : Number(rangeParts[2]),
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};
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}
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export {parseRangeHeader};
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