зеркало из https://github.com/mozilla/gecko-dev.git
88 строки
2.7 KiB
JavaScript
88 строки
2.7 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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var ManifestIcons = {
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async browserFetchIcon(aBrowser, manifest, iconSize) {
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const msgKey = "DOM:WebManifest:fetchIcon";
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const actor = aBrowser.browsingContext.currentWindowGlobal.getActor(
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"ManifestMessages"
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);
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const reply = await actor.sendQuery(msgKey, { manifest, iconSize });
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if (!reply.success) {
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throw reply.result;
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}
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return reply.result;
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},
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async contentFetchIcon(aWindow, manifest, iconSize) {
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return getIcon(aWindow, toIconArray(manifest.icons), iconSize);
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},
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};
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function parseIconSize(size) {
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if (size === "any" || size === "") {
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// We want icons without size specified to sorted
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// as the largest available icons
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return Number.MAX_SAFE_INTEGER;
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}
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// 100x100 will parse as 100
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return parseInt(size, 10);
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}
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// Create an array of icons sorted by their size
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function toIconArray(icons) {
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const iconBySize = [];
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icons.forEach(icon => {
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const sizes = "sizes" in icon ? icon.sizes : "";
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sizes.forEach(size => {
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iconBySize.push({ src: icon.src, size: parseIconSize(size) });
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});
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});
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return iconBySize.sort((a, b) => a.size - b.size);
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}
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async function getIcon(aWindow, icons, expectedSize) {
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if (!icons.length) {
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throw new Error("Could not find valid icon");
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}
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// We start trying the smallest icon that is larger than the requested
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// size and go up to the largest icon if they fail, if all those fail
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// go back down to the smallest
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let index = icons.findIndex(icon => icon.size >= expectedSize);
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if (index === -1) {
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index = icons.length - 1;
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}
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return fetchIcon(aWindow, icons[index].src).catch(err => {
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// Remove all icons with the failed source, the same source
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// may have been used for multiple sizes
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icons = icons.filter(x => x.src !== icons[index].src);
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return getIcon(aWindow, icons, expectedSize);
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});
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}
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async function fetchIcon(aWindow, src) {
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const iconURL = new aWindow.URL(src, aWindow.location);
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// If this is already a data URL then no need to load it again.
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if (iconURL.protocol === "data:") {
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return iconURL.href;
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}
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const request = new aWindow.Request(iconURL, { mode: "cors" });
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request.overrideContentPolicyType(Ci.nsIContentPolicy.TYPE_IMAGE);
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const response = await aWindow.fetch(request);
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const blob = await response.blob();
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onloadend = () => resolve(reader.result);
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reader.onerror = reject;
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reader.readAsDataURL(blob);
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});
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}
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var EXPORTED_SYMBOLS = ["ManifestIcons"]; // jshint ignore:line
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