mirror of
https://github.com/mozilla/pdf.js.git
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3fe256cd0d
- Replace DOM-based pdfHandler.html (background page) with background.js (extension service worker). - Adjust logic of background scripts to account for the fact that the scripts can execute repeatedly during a browser session. Primarily, register relevant extension event handlers at the top level and use in-memory storage.session API to keep track of initialization state. - Extension URL router: replace blocking webRequest with the service worker-specific "fetch" event. - PDF detection: replace blocking webRequest with declarativeNetRequest. This requires Chrome 128+. The next commit will add a fallback for earlier Chrome versions.
104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
/*
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Copyright 2013 Mozilla Foundation
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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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http://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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"use strict";
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(function ExtensionRouterClosure() {
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var VIEWER_URL = chrome.runtime.getURL("content/web/viewer.html");
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var CRX_BASE_URL = chrome.runtime.getURL("/");
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var schemes = [
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"http",
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"https",
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"file",
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"chrome-extension",
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"blob",
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"data",
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// Chromium OS
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"filesystem",
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// Chromium OS, shorthand for filesystem:<origin>/external/
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"drive",
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];
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/**
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* @param {string} url The URL prefixed with chrome-extension://.../
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* @returns {string|undefined} The percent-encoded URL of the (PDF) file.
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*/
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function parseExtensionURL(url) {
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url = url.substring(CRX_BASE_URL.length);
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// Find the (url-encoded) colon and verify that the scheme is allowed.
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var schemeIndex = url.search(/:|%3A/i);
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if (schemeIndex === -1) {
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return undefined;
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}
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var scheme = url.slice(0, schemeIndex).toLowerCase();
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if (schemes.includes(scheme)) {
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url = url.split("#", 1)[0];
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if (url.charAt(schemeIndex) === ":") {
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url = encodeURIComponent(url);
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}
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return url;
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}
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return undefined;
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}
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function resolveViewerURL(originalUrl) {
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if (originalUrl.startsWith(CRX_BASE_URL)) {
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// This listener converts chrome-extension://.../http://...pdf to
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// chrome-extension://.../content/web/viewer.html?file=http%3A%2F%2F...pdf
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var url = parseExtensionURL(originalUrl);
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if (url) {
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url = VIEWER_URL + "?file=" + url;
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var i = originalUrl.indexOf("#");
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if (i > 0) {
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url += originalUrl.slice(i);
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}
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return url;
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}
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}
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return undefined;
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}
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self.addEventListener("fetch", event => {
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const req = event.request;
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if (req.destination === "document") {
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var url = resolveViewerURL(req.url);
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if (url) {
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console.log("Redirecting " + req.url + " to " + url);
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event.respondWith(Response.redirect(url));
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}
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}
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});
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// Ctrl + F5 bypasses service worker. the pretty extension URLs will fail to
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// resolve in that case. Catch this and redirect to destination.
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chrome.webNavigation.onErrorOccurred.addListener(
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details => {
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if (details.frameId !== 0) {
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// Not a top-level frame. Cannot easily navigate a specific child frame.
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return;
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}
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const url = resolveViewerURL(details.url);
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if (url) {
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console.log(`Redirecting ${details.url} to ${url} (fallback)`);
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chrome.tabs.update(details.tabId, { url });
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}
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},
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{ url: [{ urlPrefix: CRX_BASE_URL }] }
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);
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console.log("Set up extension URL router.");
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})();
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