c00e237421
The `DownloadManager.openOrDownloadData` method is written for the default-viewer specifically, assuming a viewer able to handle e.g. URL search/hash parameters. In the viewer components there's obviously no such functionality, and we should thus trigger downloading of PDF attachments directly instead.
120 lines
3.8 KiB
JavaScript
120 lines
3.8 KiB
JavaScript
/* Copyright 2013 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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/** @typedef {import("./interfaces").IDownloadManager} IDownloadManager */
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import { createValidAbsoluteUrl, isPdfFile } from "pdfjs-lib";
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if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("CHROME || GENERIC")) {
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throw new Error(
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'Module "pdfjs-web/download_manager" shall not be used ' +
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"outside CHROME and GENERIC builds."
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);
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}
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function download(blobUrl, filename) {
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const a = document.createElement("a");
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if (!a.click) {
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throw new Error('DownloadManager: "a.click()" is not supported.');
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}
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a.href = blobUrl;
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a.target = "_parent";
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// Use a.download if available. This increases the likelihood that
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// the file is downloaded instead of opened by another PDF plugin.
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if ("download" in a) {
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a.download = filename;
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}
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// <a> must be in the document for recent Firefox versions,
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// otherwise .click() is ignored.
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(document.body || document.documentElement).append(a);
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a.click();
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a.remove();
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}
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/**
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* @implements {IDownloadManager}
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*/
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class DownloadManager {
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#openBlobUrls = new WeakMap();
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downloadUrl(url, filename) {
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if (!createValidAbsoluteUrl(url, "http://example.com")) {
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console.error(`downloadUrl - not a valid URL: ${url}`);
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return; // restricted/invalid URL
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}
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download(url + "#pdfjs.action=download", filename);
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}
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downloadData(data, filename, contentType) {
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const blobUrl = URL.createObjectURL(
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new Blob([data], { type: contentType })
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);
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download(blobUrl, filename);
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}
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/**
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* @returns {boolean} Indicating if the data was opened.
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*/
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openOrDownloadData(element, data, filename) {
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const isPdfData = isPdfFile(filename);
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const contentType = isPdfData ? "application/pdf" : "";
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if (
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(typeof PDFJSDev === "undefined" || !PDFJSDev.test("COMPONENTS")) &&
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isPdfData
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) {
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let blobUrl = this.#openBlobUrls.get(element);
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if (!blobUrl) {
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blobUrl = URL.createObjectURL(new Blob([data], { type: contentType }));
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this.#openBlobUrls.set(element, blobUrl);
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}
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let viewerUrl;
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if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
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// The current URL is the viewer, let's use it and append the file.
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viewerUrl = "?file=" + encodeURIComponent(blobUrl + "#" + filename);
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} else if (PDFJSDev.test("CHROME")) {
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// In the Chrome extension, the URL is rewritten using the history API
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// in viewer.js, so an absolute URL must be generated.
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viewerUrl =
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// eslint-disable-next-line no-undef
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chrome.runtime.getURL("/content/web/viewer.html") +
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"?file=" +
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encodeURIComponent(blobUrl + "#" + filename);
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}
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try {
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window.open(viewerUrl);
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return true;
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} catch (ex) {
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console.error(`openOrDownloadData: ${ex}`);
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// Release the `blobUrl`, since opening it failed, and fallback to
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// downloading the PDF file.
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URL.revokeObjectURL(blobUrl);
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this.#openBlobUrls.delete(element);
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}
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}
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this.downloadData(data, filename, contentType);
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return false;
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}
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download(blob, url, filename) {
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const blobUrl = URL.createObjectURL(blob);
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download(blobUrl, filename);
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}
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}
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export { DownloadManager };
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