/* 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/. */
export var ManifestIcons = {
async browserFetchIcon(aBrowser, manifest, iconSize) {
const msgKey = "DOM:WebManifest:fetchIcon";
const actor =
aBrowser.browsingContext.currentWindowGlobal.getActor("ManifestMessages");
const reply = await actor.sendQuery(msgKey, { manifest, iconSize });
if (!reply.success) {
throw reply.result;
}
return reply.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(() => {
// 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);
});
}
