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712 lines
19 KiB
JavaScript
712 lines
19 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const EXPORTED_SYMBOLS = ["FaviconLoader"];
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const { XPCOMUtils } = ChromeUtils.import(
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"resource://gre/modules/XPCOMUtils.jsm"
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);
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const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
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XPCOMUtils.defineLazyGlobalGetters(this, ["Blob", "FileReader"]);
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ChromeUtils.defineModuleGetter(
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this,
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"DeferredTask",
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"resource://gre/modules/DeferredTask.jsm"
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);
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ChromeUtils.defineModuleGetter(
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this,
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"PromiseUtils",
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"resource://gre/modules/PromiseUtils.jsm"
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);
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const STREAM_SEGMENT_SIZE = 4096;
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const PR_UINT32_MAX = 0xffffffff;
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const BinaryInputStream = Components.Constructor(
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"@mozilla.org/binaryinputstream;1",
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"nsIBinaryInputStream",
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"setInputStream"
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);
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const StorageStream = Components.Constructor(
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"@mozilla.org/storagestream;1",
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"nsIStorageStream",
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"init"
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);
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const BufferedOutputStream = Components.Constructor(
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"@mozilla.org/network/buffered-output-stream;1",
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"nsIBufferedOutputStream",
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"init"
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);
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const SIZES_TELEMETRY_ENUM = {
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NO_SIZES: 0,
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ANY: 1,
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DIMENSION: 2,
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INVALID: 3,
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};
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const FAVICON_PARSING_TIMEOUT = 100;
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const FAVICON_RICH_ICON_MIN_WIDTH = 96;
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const PREFERRED_WIDTH = 16;
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// URL schemes that we don't want to load and convert to data URLs.
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const LOCAL_FAVICON_SCHEMES = ["chrome", "about", "resource", "data"];
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const MAX_FAVICON_EXPIRATION = 7 * 24 * 60 * 60 * 1000;
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const MAX_ICON_SIZE = 2048;
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const TYPE_ICO = "image/x-icon";
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const TYPE_SVG = "image/svg+xml";
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function promiseBlobAsDataURL(blob) {
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return new Promise((resolve, reject) => {
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let reader = new FileReader();
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reader.addEventListener("load", () => resolve(reader.result));
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reader.addEventListener("error", reject);
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reader.readAsDataURL(blob);
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});
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}
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function promiseBlobAsOctets(blob) {
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return new Promise((resolve, reject) => {
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let reader = new FileReader();
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reader.addEventListener("load", () => {
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resolve(Array.from(reader.result).map(c => c.charCodeAt(0)));
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});
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reader.addEventListener("error", reject);
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reader.readAsBinaryString(blob);
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});
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}
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function promiseImage(stream, type) {
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return new Promise((resolve, reject) => {
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let imgTools = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools);
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imgTools.decodeImageAsync(
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stream,
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type,
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(image, result) => {
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if (!Components.isSuccessCode(result)) {
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reject();
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return;
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}
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resolve(image);
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},
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Services.tm.currentThread
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);
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});
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}
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class FaviconLoad {
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constructor(iconInfo) {
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this.icon = iconInfo;
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this.channel = Services.io.newChannelFromURI(
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iconInfo.iconUri,
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iconInfo.node,
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iconInfo.node.nodePrincipal,
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iconInfo.node.nodePrincipal,
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Ci.nsILoadInfo.SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT |
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Ci.nsILoadInfo.SEC_ALLOW_CHROME |
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Ci.nsILoadInfo.SEC_DISALLOW_SCRIPT,
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Ci.nsIContentPolicy.TYPE_INTERNAL_IMAGE_FAVICON
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);
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if (this.channel instanceof Ci.nsIHttpChannel) {
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this.channel.QueryInterface(Ci.nsIHttpChannel);
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let referrerInfo = Cc["@mozilla.org/referrer-info;1"].createInstance(
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Ci.nsIReferrerInfo
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);
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// Sometimes node is a document and sometimes it is an element. We need
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// to set the referrer info correctly either way.
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if (iconInfo.node.nodeType == iconInfo.node.DOCUMENT_NODE) {
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referrerInfo.initWithDocument(iconInfo.node);
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} else {
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referrerInfo.initWithElement(iconInfo.node);
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}
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this.channel.referrerInfo = referrerInfo;
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}
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this.channel.loadFlags |=
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Ci.nsIRequest.LOAD_BACKGROUND |
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Ci.nsIRequest.VALIDATE_NEVER |
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Ci.nsIRequest.LOAD_FROM_CACHE;
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// Sometimes node is a document and sometimes it is an element. This is
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// the easiest single way to get to the load group in both those cases.
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this.channel.loadGroup =
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iconInfo.node.ownerGlobal.document.documentLoadGroup;
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this.channel.notificationCallbacks = this;
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if (this.channel instanceof Ci.nsIHttpChannelInternal) {
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this.channel.blockAuthPrompt = true;
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}
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if (
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Services.prefs.getBoolPref("network.http.tailing.enabled", true) &&
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this.channel instanceof Ci.nsIClassOfService
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) {
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this.channel.addClassFlags(
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Ci.nsIClassOfService.Tail | Ci.nsIClassOfService.Throttleable
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);
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}
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}
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load() {
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this._deferred = PromiseUtils.defer();
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// Clear the references when we succeed or fail.
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let cleanup = () => {
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this.channel = null;
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this.dataBuffer = null;
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this.stream = null;
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};
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this._deferred.promise.then(cleanup, cleanup);
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this.dataBuffer = new StorageStream(STREAM_SEGMENT_SIZE, PR_UINT32_MAX);
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// storage streams do not implement writeFrom so wrap it with a buffered stream.
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this.stream = new BufferedOutputStream(
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this.dataBuffer.getOutputStream(0),
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STREAM_SEGMENT_SIZE * 2
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);
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try {
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this.channel.asyncOpen(this);
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} catch (e) {
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this._deferred.reject(e);
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}
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return this._deferred.promise;
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}
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cancel() {
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if (!this.channel) {
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return;
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}
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this.channel.cancel(Cr.NS_BINDING_ABORTED);
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}
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onStartRequest(request) {}
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onDataAvailable(request, inputStream, offset, count) {
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this.stream.writeFrom(inputStream, count);
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}
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asyncOnChannelRedirect(oldChannel, newChannel, flags, callback) {
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if (oldChannel == this.channel) {
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this.channel = newChannel;
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}
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callback.onRedirectVerifyCallback(Cr.NS_OK);
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}
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async onStopRequest(request, statusCode) {
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if (request != this.channel) {
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// Indicates that a redirect has occurred. We don't care about the result
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// of the original channel.
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return;
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}
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this.stream.close();
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this.stream = null;
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if (!Components.isSuccessCode(statusCode)) {
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if (statusCode == Cr.NS_BINDING_ABORTED) {
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this._deferred.reject(
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Components.Exception(
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`Favicon load from ${this.icon.iconUri.spec} was cancelled.`,
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statusCode
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)
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);
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} else {
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this._deferred.reject(
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Components.Exception(
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`Favicon at "${this.icon.iconUri.spec}" failed to load.`,
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statusCode
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)
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);
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}
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return;
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}
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if (this.channel instanceof Ci.nsIHttpChannel) {
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if (!this.channel.requestSucceeded) {
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this._deferred.reject(
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Components.Exception(
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`Favicon at "${this.icon.iconUri.spec}" failed to load: ${this.channel.responseStatusText}.`,
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Cr.NS_ERROR_FAILURE
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)
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);
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return;
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}
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}
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// By default don't store icons added after "pageshow".
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let canStoreIcon = this.icon.beforePageShow;
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if (canStoreIcon) {
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// Don't store icons responding with Cache-Control: no-store.
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try {
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if (
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this.channel instanceof Ci.nsIHttpChannel &&
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this.channel.isNoStoreResponse()
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) {
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canStoreIcon = false;
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}
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} catch (ex) {
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if (ex.result != Cr.NS_ERROR_NOT_AVAILABLE) {
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throw ex;
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}
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}
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}
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// Attempt to get an expiration time from the cache. If this fails, we'll
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// use this default.
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let expiration = Date.now() + MAX_FAVICON_EXPIRATION;
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// This stuff isn't available after onStopRequest returns (so don't start
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// any async operations before this!).
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if (this.channel instanceof Ci.nsICacheInfoChannel) {
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try {
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expiration = Math.min(
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this.channel.cacheTokenExpirationTime * 1000,
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expiration
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);
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} catch (e) {
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// Ignore failures to get the expiration time.
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}
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}
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try {
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let stream = new BinaryInputStream(this.dataBuffer.newInputStream(0));
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let buffer = new ArrayBuffer(this.dataBuffer.length);
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stream.readArrayBuffer(buffer.byteLength, buffer);
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let type = this.channel.contentType;
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let blob = new Blob([buffer], { type });
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if (type != "image/svg+xml") {
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let octets = await promiseBlobAsOctets(blob);
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let sniffer = Cc["@mozilla.org/image/loader;1"].createInstance(
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Ci.nsIContentSniffer
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);
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type = sniffer.getMIMETypeFromContent(
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this.channel,
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octets,
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octets.length
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);
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if (!type) {
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throw Components.Exception(
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`Favicon at "${this.icon.iconUri.spec}" did not match a known mimetype.`,
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Cr.NS_ERROR_FAILURE
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);
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}
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blob = blob.slice(0, blob.size, type);
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let image;
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try {
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image = await promiseImage(this.dataBuffer.newInputStream(0), type);
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} catch (e) {
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throw Components.Exception(
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`Favicon at "${this.icon.iconUri.spec}" could not be decoded.`,
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Cr.NS_ERROR_FAILURE
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);
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}
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if (image.width > MAX_ICON_SIZE || image.height > MAX_ICON_SIZE) {
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throw Components.Exception(
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`Favicon at "${this.icon.iconUri.spec}" is too large.`,
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Cr.NS_ERROR_FAILURE
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);
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}
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}
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let dataURL = await promiseBlobAsDataURL(blob);
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this._deferred.resolve({
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expiration,
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dataURL,
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canStoreIcon,
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});
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} catch (e) {
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this._deferred.reject(e);
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}
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}
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getInterface(iid) {
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if (iid.equals(Ci.nsIChannelEventSink)) {
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return this;
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}
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throw Components.Exception("", Cr.NS_ERROR_NO_INTERFACE);
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}
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}
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/*
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* Extract the icon width from the size attribute. It also sends the telemetry
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* about the size type and size dimension info.
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*
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* @param {Array} aSizes An array of strings about size.
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* @return {Number} A width of the icon in pixel.
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*/
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function extractIconSize(aSizes) {
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let width = -1;
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let sizesType;
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const re = /^([1-9][0-9]*)x[1-9][0-9]*$/i;
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if (aSizes.length) {
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for (let size of aSizes) {
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if (size.toLowerCase() == "any") {
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sizesType = SIZES_TELEMETRY_ENUM.ANY;
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break;
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} else {
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let values = re.exec(size);
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if (values && values.length > 1) {
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sizesType = SIZES_TELEMETRY_ENUM.DIMENSION;
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width = parseInt(values[1]);
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break;
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} else {
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sizesType = SIZES_TELEMETRY_ENUM.INVALID;
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break;
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}
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}
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}
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} else {
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sizesType = SIZES_TELEMETRY_ENUM.NO_SIZES;
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}
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// Telemetry probes for measuring the sizes attribute
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// usage and available dimensions.
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Services.telemetry
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.getHistogramById("LINK_ICON_SIZES_ATTR_USAGE")
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.add(sizesType);
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if (width > 0) {
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Services.telemetry
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.getHistogramById("LINK_ICON_SIZES_ATTR_DIMENSION")
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.add(width);
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}
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return width;
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}
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/*
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* Get link icon URI from a link dom node.
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*
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* @param {DOMNode} aLink A link dom node.
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* @return {nsIURI} A uri of the icon.
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*/
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function getLinkIconURI(aLink) {
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let targetDoc = aLink.ownerDocument;
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let uri = Services.io.newURI(aLink.href, targetDoc.characterSet);
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try {
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uri = uri
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.mutate()
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.setUserPass("")
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.finalize();
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} catch (e) {
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// some URIs are immutable
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}
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return uri;
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}
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/**
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* Guess a type for an icon based on its declared type or file extension.
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*/
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function guessType(icon) {
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// No type with no icon
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if (!icon) {
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return "";
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}
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// Use the file extension to guess at a type we're interested in
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if (!icon.type) {
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let extension = icon.iconUri.filePath.split(".").pop();
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switch (extension) {
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case "ico":
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return TYPE_ICO;
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case "svg":
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return TYPE_SVG;
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}
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}
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// Fuzzily prefer the type or fall back to the declared type
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return icon.type == "image/vnd.microsoft.icon" ? TYPE_ICO : icon.type || "";
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}
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/*
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* Selects the best rich icon and tab icon from a list of IconInfo objects.
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*
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* @param {Array} iconInfos A list of IconInfo objects.
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* @param {integer} preferredWidth The preferred width for tab icons.
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*/
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function selectIcons(iconInfos, preferredWidth) {
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if (!iconInfos.length) {
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return {
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richIcon: null,
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tabIcon: null,
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};
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}
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let preferredIcon;
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let bestSizedIcon;
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// Other links with the "icon" tag are the default icons
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let defaultIcon;
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// Rich icons are either apple-touch or fluid icons, or the ones of the
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// dimension 96x96 or greater
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let largestRichIcon;
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for (let icon of iconInfos) {
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if (!icon.isRichIcon) {
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// First check for svg. If it's not available check for an icon with a
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// size adapt to the current resolution. If both are not available, prefer
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// ico files. When multiple icons are in the same set, the latest wins.
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if (guessType(icon) == TYPE_SVG) {
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preferredIcon = icon;
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} else if (
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icon.width == preferredWidth &&
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guessType(preferredIcon) != TYPE_SVG
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) {
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preferredIcon = icon;
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} else if (
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guessType(icon) == TYPE_ICO &&
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(!preferredIcon || guessType(preferredIcon) == TYPE_ICO)
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) {
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preferredIcon = icon;
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}
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// Check for an icon larger yet closest to preferredWidth, that can be
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// downscaled efficiently.
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if (
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icon.width >= preferredWidth &&
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(!bestSizedIcon || bestSizedIcon.width >= icon.width)
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) {
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bestSizedIcon = icon;
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}
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}
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// Note that some sites use hi-res icons without specifying them as
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// apple-touch or fluid icons.
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if (icon.isRichIcon || icon.width >= FAVICON_RICH_ICON_MIN_WIDTH) {
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if (!largestRichIcon || largestRichIcon.width < icon.width) {
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largestRichIcon = icon;
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}
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} else {
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defaultIcon = icon;
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}
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}
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// Now set the favicons for the page in the following order:
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// 1. Set the best rich icon if any.
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// 2. Set the preferred one if any, otherwise check if there's a better
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// sized fit.
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// This order allows smaller icon frames to eventually override rich icon
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// frames.
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let tabIcon = null;
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if (preferredIcon) {
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tabIcon = preferredIcon;
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} else if (bestSizedIcon) {
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tabIcon = bestSizedIcon;
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} else if (defaultIcon) {
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tabIcon = defaultIcon;
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}
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return {
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richIcon: largestRichIcon,
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tabIcon,
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};
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}
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class IconLoader {
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constructor(actor) {
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this.actor = actor;
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}
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async load(iconInfo) {
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if (this._loader) {
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this._loader.cancel();
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}
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if (LOCAL_FAVICON_SCHEMES.includes(iconInfo.iconUri.scheme)) {
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// We need to do a manual security check because the channel won't do
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// it for us.
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try {
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Services.scriptSecurityManager.checkLoadURIWithPrincipal(
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iconInfo.node.nodePrincipal,
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iconInfo.iconUri,
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Services.scriptSecurityManager.ALLOW_CHROME
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);
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} catch (ex) {
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return;
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}
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this.actor.sendAsyncMessage("Link:SetIcon", {
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pageURL: iconInfo.pageUri.spec,
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originalURL: iconInfo.iconUri.spec,
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canUseForTab: !iconInfo.isRichIcon,
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expiration: undefined,
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iconURL: iconInfo.iconUri.spec,
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canStoreIcon: true,
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});
|
|
return;
|
|
}
|
|
|
|
// Let the main process that a tab icon is possibly coming.
|
|
this.actor.sendAsyncMessage("Link:LoadingIcon", {
|
|
originalURL: iconInfo.iconUri.spec,
|
|
canUseForTab: !iconInfo.isRichIcon,
|
|
});
|
|
|
|
try {
|
|
this._loader = new FaviconLoad(iconInfo);
|
|
let { dataURL, expiration, canStoreIcon } = await this._loader.load();
|
|
|
|
this.actor.sendAsyncMessage("Link:SetIcon", {
|
|
pageURL: iconInfo.pageUri.spec,
|
|
originalURL: iconInfo.iconUri.spec,
|
|
canUseForTab: !iconInfo.isRichIcon,
|
|
expiration,
|
|
iconURL: dataURL,
|
|
canStoreIcon,
|
|
});
|
|
} catch (e) {
|
|
if (e.result != Cr.NS_BINDING_ABORTED) {
|
|
Cu.reportError(e);
|
|
|
|
// Used mainly for tests currently.
|
|
this.actor.sendAsyncMessage("Link:SetFailedIcon", {
|
|
originalURL: iconInfo.iconUri.spec,
|
|
canUseForTab: !iconInfo.isRichIcon,
|
|
});
|
|
}
|
|
} finally {
|
|
this._loader = null;
|
|
}
|
|
}
|
|
|
|
cancel() {
|
|
if (!this._loader) {
|
|
return;
|
|
}
|
|
|
|
this._loader.cancel();
|
|
this._loader = null;
|
|
}
|
|
}
|
|
|
|
class FaviconLoader {
|
|
constructor(actor) {
|
|
this.actor = actor;
|
|
this.iconInfos = [];
|
|
|
|
// Icons added after onPageShow() are likely added by modifying <link> tags
|
|
// through javascript; we want to avoid storing those permanently because
|
|
// they are probably used to show badges, and many of them could be
|
|
// randomly generated. This boolean can be used to track that case.
|
|
this.beforePageShow = true;
|
|
|
|
// For every page we attempt to find a rich icon and a tab icon. These
|
|
// objects take care of the load process for each.
|
|
this.richIconLoader = new IconLoader(actor);
|
|
this.tabIconLoader = new IconLoader(actor);
|
|
|
|
this.iconTask = new DeferredTask(
|
|
() => this.loadIcons(),
|
|
FAVICON_PARSING_TIMEOUT
|
|
);
|
|
}
|
|
|
|
loadIcons() {
|
|
// If the page is unloaded immediately after the DeferredTask's timer fires
|
|
// we can still attempt to load icons, which will fail since the content
|
|
// window is no longer available. Checking if iconInfos has been cleared
|
|
// allows us to bail out early in this case.
|
|
if (!this.iconInfos.length) {
|
|
return;
|
|
}
|
|
|
|
let preferredWidth =
|
|
PREFERRED_WIDTH * Math.ceil(this.actor.contentWindow.devicePixelRatio);
|
|
let { richIcon, tabIcon } = selectIcons(this.iconInfos, preferredWidth);
|
|
this.iconInfos = [];
|
|
|
|
if (richIcon) {
|
|
this.richIconLoader.load(richIcon);
|
|
}
|
|
|
|
if (tabIcon) {
|
|
this.tabIconLoader.load(tabIcon);
|
|
}
|
|
}
|
|
|
|
addIconFromLink(aLink, aIsRichIcon) {
|
|
let iconInfo = makeFaviconFromLink(aLink, aIsRichIcon);
|
|
if (iconInfo) {
|
|
iconInfo.beforePageShow = this.beforePageShow;
|
|
this.iconInfos.push(iconInfo);
|
|
this.iconTask.arm();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
addDefaultIcon(pageUri) {
|
|
// Currently ImageDocuments will just load the default favicon, see bug
|
|
// 403651 for discussion.
|
|
this.iconInfos.push({
|
|
pageUri,
|
|
iconUri: pageUri
|
|
.mutate()
|
|
.setPathQueryRef("/favicon.ico")
|
|
.finalize(),
|
|
width: -1,
|
|
isRichIcon: false,
|
|
type: TYPE_ICO,
|
|
node: this.actor.document,
|
|
beforePageShow: this.beforePageShow,
|
|
});
|
|
this.iconTask.arm();
|
|
}
|
|
|
|
onPageShow() {
|
|
// We're likely done with icon parsing so load the pending icons now.
|
|
if (this.iconTask.isArmed) {
|
|
this.iconTask.disarm();
|
|
this.loadIcons();
|
|
}
|
|
this.beforePageShow = false;
|
|
}
|
|
|
|
onPageHide() {
|
|
this.richIconLoader.cancel();
|
|
this.tabIconLoader.cancel();
|
|
|
|
this.iconTask.disarm();
|
|
this.iconInfos = [];
|
|
}
|
|
}
|
|
|
|
function makeFaviconFromLink(aLink, aIsRichIcon) {
|
|
let iconUri = getLinkIconURI(aLink);
|
|
if (!iconUri) {
|
|
return null;
|
|
}
|
|
|
|
// Extract the size type and width.
|
|
let width = extractIconSize(aLink.sizes);
|
|
|
|
return {
|
|
pageUri: aLink.ownerDocument.documentURIObject,
|
|
iconUri,
|
|
width,
|
|
isRichIcon: aIsRichIcon,
|
|
type: aLink.type,
|
|
node: aLink,
|
|
};
|
|
}
|