first commit

calcom/packages/lib/server/resizeBase64Image.ts

@@ -0,0 +1,36 @@
+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")}`;
+}