37 lines
1.0 KiB
TypeScript
37 lines
1.0 KiB
TypeScript
import jimp from "jimp";
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export function isBase64Image(value: string): boolean {
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return /^data:image\/(png|jpe?g);base64,/i.test(value);
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}
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export async function resizeBase64Image(
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base64OrUrl: string,
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opts?: {
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maxSize?: number;
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}
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) {
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if (!base64OrUrl.startsWith("data:")) {
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// might be a `https://` or something
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return base64OrUrl;
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}
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const mimeMatch = base64OrUrl.match(/^data:(\w+\/\w+);/);
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const mimetype = mimeMatch?.[1];
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if (!mimetype) {
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throw new Error(`Could not distinguish mimetype`);
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}
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const buffer = Buffer.from(base64OrUrl.replace(/^data:image\/\w+;base64,/, ""), "base64");
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const {
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// 96px is the height of the image on https://cal.com/peer
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maxSize = 96 * 4,
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} = opts ?? {};
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const image = await jimp.read(buffer);
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const currentSize = Math.max(image.getWidth(), image.getHeight());
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if (currentSize > maxSize) {
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image.resize(jimp.AUTO, maxSize);
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}
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const newBuffer = await image.getBufferAsync(mimetype);
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return `data:${mimetype};base64,${newBuffer.toString("base64")}`;
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}
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