cal.pub0.org/server/lib/resizeBase64Image.ts

37 lines
1.0 KiB
TypeScript

import jimp from "jimp";
export async function resizeBase64Image(
base64OrUrl: string,
opts?: {
maxSize?: number;
}
) {
if (!base64OrUrl.startsWith("data:")) {
// might be a `https://` or something
return base64OrUrl;
}
const mimeMatch = base64OrUrl.match(/^data:(\w+\/\w+);/);
const mimetype = mimeMatch?.[1];
if (!mimetype) {
throw new Error(`Could not distinguish mimetype`);
}
const buffer = Buffer.from(base64OrUrl.replace(/^data:image\/\w+;base64,/, ""), "base64");
const {
// 96px is the height of the image on https://cal.com/peer
maxSize = 96 * 4,
} = opts ?? {};
const image = await jimp.read(buffer);
if (image.getHeight() !== image.getHeight()) {
// this could be handled later
throw new Error("Image is not a square");
}
const currentSize = Math.max(image.getWidth(), image.getHeight());
if (currentSize > maxSize) {
image.resize(jimp.AUTO, maxSize);
}
const newBuffer = await image.getBufferAsync(mimetype);
return `data:${mimetype};base64,${newBuffer.toString("base64")}`;
}