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const titleRegex = /^\((\d+)\)/;
const getJson = async relativeUri => {
const req = await window.fetch(`${window.origin}${relativeUri}`, {
Accept: 'application/json',
});
return req.json();
};
const getInstanceConfig = async () => {
const staticConfig = await getJson('/static/config.json');
try {
const frontendConfig = await getJson(
'/api/pleroma/frontend_configurations',
);
const pleromaFeConfig = frontendConfig.pleroma_fe || {};
return { ...staticConfig, ...pleromaFeConfig };
} catch (error) {
// eslint-disable-next-line no-console
console.log('Failed to load dynamic frontend configuration', error);
return staticConfig;
}
};
const getInstanceLogo = async () => {
const config = await getInstanceConfig();
if (!config.logo) {
throw new Error('Instance has no logo');
}
return new Promise((resolve, reject) => {
const img = document.createElement('img');
img.addEventListener('load', () => {
resolve({
logo: img,
logoMask: config.logoMask,
});
});
img.addEventListener('error', event => {
reject(
new Error(
`${event.type} error loading ${config.logo}: ${event.message}`,
),
);
});
img.src = `${origin}${config.logo}`;
});
};
const getPropertyValue = (style, property) => {
const value = style.getPropertyValue(property) || '';
return value.trim();
};
const R = 0;
const G = 1;
const B = 2;
const A = 3;
const SCALE = 255;
const clamp = b => Math.min(Math.max(Math.round(b), 0), SCALE);
const scalePixel = b => clamp(b * SCALE);
const unscalePixel = b => b / SCALE;
const blend = (bgValue, bgWeight, fgValue, fgWeight) => {
const sum = bgValue * bgWeight + fgValue * fgWeight;
return clamp(sum / (bgWeight + fgWeight));
};
class LogoUpdater {
constructor(img, mask) {
this._img = img;
this._mask = mask;
this._size = Math.max(img.width, img.height);
this._canvas = document.createElement('canvas');
this._canvas.width = this._size;
this._canvas.height = this._size;
this._ctx = this._canvas.getContext('2d');
this._dx = Math.floor((this._size - img.width) / 2);
this._dy = Math.floor((this._size - img.height) / 2);
this._previousBg = '';
this._previousFg = '';
}
update() {
const style = window.getComputedStyle(document.body);
const bg = getPropertyValue(style, '--topBar');
if (this._mask) {
const fg = getPropertyValue(style, '--topBarText');
if (this._previousBg !== bg || this._previousFg !== fg) {
this._updateMask(bg, fg);
this._previousBg = bg;
this._previousFg = fg;
return true;
}
} else if (this._previousBg !== bg) {
this._updateNoMask(bg);
this._previousBg = bg;
return true;
}
return false;
}
toDataURL() {
return this._canvas.toDataURL();
}
_updateNoMask(bg) {
this._ctx.fillStyle = bg;
this._ctx.fillRect(0, 0, this._size, this._size);
this._drawImage();
}
_updateMask(bg, fg) {
const bgColor = this._getColorData(bg);
const fgColor = this._getColorData(fg);
const bgAlpha = unscalePixel(bgColor[A]);
const fgAlpha = unscalePixel(fgColor[A]);
this._ctx.clearRect(0, 0, this._size, this._size);
this._drawImage();
const data = this._ctx.getImageData(0, 0, this._size, this._size);
const arr = data.data;
const length = data.width * data.height * 4;
for (let i = 0; i < length; i += 4) {
const logoAlpha = unscalePixel(arr[i + A]);
const fgWeight = logoAlpha * fgAlpha;
const bgWeight = bgAlpha * (1 - fgWeight);
arr[i + R] = blend(bgColor[R], bgWeight, fgColor[R], fgWeight);
arr[i + G] = blend(bgColor[G], bgWeight, fgColor[G], fgWeight);
arr[i + B] = blend(bgColor[B], bgWeight, fgColor[B], fgWeight);
arr[i + A] = scalePixel(bgWeight + fgWeight);
}
this._ctx.putImageData(data, 0, 0);
}
_getColorData(str) {
this._ctx.fillStyle = str;
this._ctx.fillRect(0, 0, 1, 1);
return this._ctx.getImageData(0, 0, 1, 1).data;
}
_drawImage() {
this._ctx.drawImage(this._img, this._dx, this._dy);
}
}
module.exports = Ferdium => {
const getMessages = () => {
let directCount = 0;
const matchArr = document.title.match(titleRegex);
if (matchArr) {
directCount = Ferdium.safeParseInt(matchArr[1]);
}
Ferdium.setBadge(directCount);
};
getInstanceLogo().then(
({ logo, logoMask }) => {
const updater = new LogoUpdater(logo, logoMask);
Ferdium.loop(() => {
getMessages();
if (updater.update()) {
Ferdium.setAvatarImage(updater.toDataURL());
}
});
},
error => {
// eslint-disable-next-line no-console
console.log('Failed to load instance logo', error);
Ferdium.loop(getMessages);
},
);
};
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