9e262ae7fa
Please find additional details about the ESLint rule at https://eslint.org/docs/rules/prefer-const With the recent introduction of Prettier this sort of mass enabling of ESLint rules becomes a lot easier, since the code will be automatically reformatted as necessary to account for e.g. changed line lengths. Note that this patch is generated automatically, by using the ESLint `--fix` argument, and will thus require some additional clean-up (which is done separately).
104 lines
2.8 KiB
JavaScript
104 lines
2.8 KiB
JavaScript
/* 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 {
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assert,
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MissingPDFException,
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UnexpectedResponseException,
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} from "../shared/util.js";
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import { getFilenameFromContentDispositionHeader } from "./content_disposition.js";
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function validateRangeRequestCapabilities({
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getResponseHeader,
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isHttp,
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rangeChunkSize,
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disableRange,
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}) {
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assert(rangeChunkSize > 0, "Range chunk size must be larger than zero");
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const returnValues = {
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allowRangeRequests: false,
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suggestedLength: undefined,
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};
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const length = parseInt(getResponseHeader("Content-Length"), 10);
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if (!Number.isInteger(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 not
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// make any sense to abort the request and retry with a range request.
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return returnValues;
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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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const 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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returnValues.allowRangeRequests = true;
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return returnValues;
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}
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function extractFilenameFromHeader(getResponseHeader) {
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const contentDisposition = getResponseHeader("Content-Disposition");
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if (contentDisposition) {
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let filename = getFilenameFromContentDispositionHeader(contentDisposition);
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if (filename.includes("%")) {
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try {
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filename = decodeURIComponent(filename);
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} catch (ex) {}
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}
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if (/\.pdf$/i.test(filename)) {
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return filename;
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}
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}
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return null;
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}
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function createResponseStatusError(status, url) {
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if (status === 404 || (status === 0 && /^file:/.test(url))) {
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return new MissingPDFException('Missing PDF "' + url + '".');
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}
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return new UnexpectedResponseException(
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"Unexpected server response (" +
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status +
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') while retrieving PDF "' +
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url +
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'".',
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status
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);
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}
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function validateResponseStatus(status) {
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return status === 200 || status === 206;
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}
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export {
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createResponseStatusError,
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extractFilenameFromHeader,
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validateRangeRequestCapabilities,
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validateResponseStatus,
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};
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