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/*
* SPDX-FileCopyrightText: leah and other Sharkey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
import tinycolor from 'tinycolor2';
class FavIconDot {
private readonly canvas: HTMLCanvasElement;
private src: string | null = null;
private ctx: CanvasRenderingContext2D | null = null;
private faviconImage: HTMLImageElement | null = null;
private faviconEL: HTMLLinkElement | undefined;
private hasLoaded: Promise<void> | undefined;
constructor() {
this.canvas = document.createElement('canvas');
}
/**
* Must be called before calling any other functions
*/
public async setup() {
const element: HTMLLinkElement = await this.getOrMakeFaviconElement();
this.faviconEL = element;
this.src = this.faviconEL.getAttribute('href');
this.ctx = this.canvas.getContext('2d');
this.faviconImage = document.createElement('img');
this.hasLoaded = new Promise((resolve, reject) => {
(this.faviconImage as HTMLImageElement).addEventListener('load', () => {
this.canvas.width = (this.faviconImage as HTMLImageElement).width;
this.canvas.height = (this.faviconImage as HTMLImageElement).height;
resolve();
});
(this.faviconImage as HTMLImageElement).addEventListener('error', () => {
reject('Failed to create favicon img element');
});
});
this.faviconImage.src = this.faviconEL.href;
}
private async getOrMakeFaviconElement(): Promise<HTMLLinkElement> {
return new Promise((resolve, reject) => {
const favicon = (document.querySelector('link[rel=icon]') ?? this.createFaviconElem()) as HTMLLinkElement;
favicon.addEventListener('load', () => {
resolve(favicon);
});
favicon.onerror = () => {
reject('Failed to load favicon');
};
resolve(favicon);
});
}
private createFaviconElem() {
const newLink = document.createElement('link');
newLink.setAttribute('rel', 'icon');
newLink.setAttribute('href', '/favicon.ico');
newLink.setAttribute('type', 'image/x-icon');
document.head.appendChild(newLink);
return newLink;
}
private drawIcon() {
if (!this.ctx || !this.faviconImage) return;
this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
this.ctx.drawImage(this.faviconImage, 0, 0, this.faviconImage.width, this.faviconImage.height);
}
private drawDot() {
if (!this.ctx || !this.faviconImage) return;
this.ctx.beginPath();
this.ctx.arc(this.faviconImage.width - 10, 10, 10, 0, 2 * Math.PI);
const computedStyle = getComputedStyle(document.documentElement);
this.ctx.fillStyle = tinycolor(computedStyle.getPropertyValue('--navIndicator')).toHexString();
this.ctx.strokeStyle = 'white';
this.ctx.fill();
this.ctx.stroke();
}
private setFavicon() {
if (this.faviconEL) this.faviconEL.href = this.canvas.toDataURL('image/png');
}
public async setVisible(isVisible: boolean) {
// Wait for it to have loaded the icon
await this.hasLoaded;
this.drawIcon();
if (isVisible) this.drawDot();
this.setFavicon();
}
public async worksOnInstance() {
try {
// Wait for it to have loaded the icon
await this.hasLoaded;
this.drawIcon();
this.drawDot();
this.canvas.toDataURL('image/png');
} catch (error) {
return false;
}
return true;
}
}
let icon: FavIconDot | undefined = undefined;
export async function setFavIconDot(visible: boolean) {
const setIconVisibility = async () => {
if (!icon) {
icon = new FavIconDot();
await icon.setup();
}
try {
(icon as FavIconDot).setVisible(visible);
} catch (error) {
//Probably failed due to CORS and a dirty canvas
}
};
// If document is already loaded, set visibility immediately
if (document.readyState === 'complete') {
await setIconVisibility();
} else {
// Otherwise, set visibility when window loads
window.addEventListener('load', setIconVisibility);
}
}
export async function worksOnInstance() {
if (!icon) {
icon = new FavIconDot();
await icon.setup();
}
return await icon.worksOnInstance();
}
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