зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
2.8 KiB
JavaScript
91 строка
2.8 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
"use strict";
|
|
|
|
const { PromiseMessage } = ChromeUtils.import(
|
|
"resource://gre/modules/PromiseMessage.jsm"
|
|
);
|
|
|
|
var ManifestIcons = {
|
|
async browserFetchIcon(aBrowser, manifest, iconSize) {
|
|
const msgKey = "DOM:WebManifest:fetchIcon";
|
|
const mm = aBrowser.messageManager;
|
|
const {
|
|
data: { success, result },
|
|
} = await PromiseMessage.send(mm, msgKey, { manifest, iconSize });
|
|
if (!success) {
|
|
throw result;
|
|
}
|
|
return result;
|
|
},
|
|
|
|
async contentFetchIcon(aWindow, manifest, iconSize) {
|
|
return getIcon(aWindow, toIconArray(manifest.icons), iconSize);
|
|
},
|
|
};
|
|
|
|
function parseIconSize(size) {
|
|
if (size === "any" || size === "") {
|
|
// We want icons without size specified to sorted
|
|
// as the largest available icons
|
|
return Number.MAX_SAFE_INTEGER;
|
|
}
|
|
// 100x100 will parse as 100
|
|
return parseInt(size, 10);
|
|
}
|
|
|
|
// Create an array of icons sorted by their size
|
|
function toIconArray(icons) {
|
|
const iconBySize = [];
|
|
icons.forEach(icon => {
|
|
const sizes = "sizes" in icon ? icon.sizes : "";
|
|
sizes.forEach(size => {
|
|
iconBySize.push({ src: icon.src, size: parseIconSize(size) });
|
|
});
|
|
});
|
|
return iconBySize.sort((a, b) => a.size - b.size);
|
|
}
|
|
|
|
async function getIcon(aWindow, icons, expectedSize) {
|
|
if (!icons.length) {
|
|
throw new Error("Could not find valid icon");
|
|
}
|
|
// We start trying the smallest icon that is larger than the requested
|
|
// size and go up to the largest icon if they fail, if all those fail
|
|
// go back down to the smallest
|
|
let index = icons.findIndex(icon => icon.size >= expectedSize);
|
|
if (index === -1) {
|
|
index = icons.length - 1;
|
|
}
|
|
|
|
return fetchIcon(aWindow, icons[index].src).catch(err => {
|
|
// Remove all icons with the failed source, the same source
|
|
// may have been used for multiple sizes
|
|
icons = icons.filter(x => x.src !== icons[index].src);
|
|
return getIcon(aWindow, icons, expectedSize);
|
|
});
|
|
}
|
|
|
|
async function fetchIcon(aWindow, src) {
|
|
const iconURL = new aWindow.URL(src, aWindow.location);
|
|
// If this is already a data URL then no need to load it again.
|
|
if (iconURL.protocol === "data:") {
|
|
return iconURL.href;
|
|
}
|
|
|
|
const request = new aWindow.Request(iconURL, { mode: "cors" });
|
|
request.overrideContentPolicyType(Ci.nsIContentPolicy.TYPE_IMAGE);
|
|
const response = await aWindow.fetch(request);
|
|
const blob = await response.blob();
|
|
return new Promise((resolve, reject) => {
|
|
const reader = new FileReader();
|
|
reader.onloadend = () => resolve(reader.result);
|
|
reader.onerror = reject;
|
|
reader.readAsDataURL(blob);
|
|
});
|
|
}
|
|
|
|
var EXPORTED_SYMBOLS = ["ManifestIcons"]; // jshint ignore:line
|