57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
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/* Copyright 2012 Mozilla Foundation
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 { isInt } from '../shared/util';
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function validateRangeRequestCapabilities({ getResponseHeader, isHttp,
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rangeChunkSize, disableRange, }) {
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let returnValues = {
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allowRangeRequests: false,
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suggestedLength: undefined,
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};
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if (disableRange || !isHttp) {
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return returnValues;
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}
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if (getResponseHeader('Accept-Ranges') !== 'bytes') {
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return returnValues;
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}
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let contentEncoding = getResponseHeader('Content-Encoding') || 'identity';
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if (contentEncoding !== 'identity') {
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return returnValues;
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}
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let length = getResponseHeader('Content-Length');
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length = parseInt(length, 10);
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if (!isInt(length)) {
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return returnValues;
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}
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returnValues.suggestedLength = length;
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if (length <= 2 * rangeChunkSize) {
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// The file size is smaller than the size of two chunks, so it does
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// not make any sense to abort the request and retry with a range
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// request.
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return returnValues;
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}
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returnValues.allowRangeRequests = true;
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return returnValues;
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}
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export {
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validateRangeRequestCapabilities,
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};
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