зеркало из https://github.com/mozilla/gecko-dev.git
86 строки
2.5 KiB
JavaScript
86 строки
2.5 KiB
JavaScript
"use strict";
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const {
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utils: Cu,
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classes: Cc,
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interfaces: Ci
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} = Components;
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Cu.import("resource://gre/modules/PromiseMessage.jsm");
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this.ManifestIcons = {
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async browserFetchIcon(aBrowser, manifest, iconSize) {
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const msgKey = "DOM:WebManifest:fetchIcon";
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const mm = aBrowser.messageManager;
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const {data: {success, result}} =
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await PromiseMessage.send(mm, msgKey, {manifest, iconSize});
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if (!success) {
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throw result;
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}
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return result;
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},
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async contentFetchIcon(aWindow, manifest, iconSize) {
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return await 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.split(" ").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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function fetchIcon(aWindow, src) {
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const manifestURL = new aWindow.URL(src);
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const request = new aWindow.Request(manifestURL, {mode: "cors"});
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request.overrideContentPolicyType(Ci.nsIContentPolicy.TYPE_WEB_MANIFEST);
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return aWindow.fetch(request)
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.then(response => response.blob())
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.then(blob => new Promise((resolve, reject) => {
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var 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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this.EXPORTED_SYMBOLS = ["ManifestIcons"]; // jshint ignore:line
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