feat: use new opengraph functions

functions/hex.ts

@@ -0,0 +1,30 @@
+const SHORT_TO_HEX: { [key: number]: string } = {};
+const HEX_TO_SHORT: Record<string, number> = {};
+
+for (let i = 0; i < 256; i++) {
+  let encodedByte = i.toString(16).toLowerCase();
+  if (encodedByte.length === 1) {
+    encodedByte = `0${encodedByte}`;
+  }
+
+  SHORT_TO_HEX[i] = encodedByte;
+  HEX_TO_SHORT[encodedByte] = i;
+}
+
+export function fromHex(encoded: string): Uint8Array {
+  if (encoded.length % 2 !== 0) {
+    throw new Error("Hex encoded strings must have an even number length");
+  }
+
+  const out = new Uint8Array(encoded.length / 2);
+  for (let i = 0; i < encoded.length; i += 2) {
+    const encodedByte = encoded.slice(i, i + 2).toLowerCase();
+    if (encodedByte in HEX_TO_SHORT) {
+      out[i / 2] = HEX_TO_SHORT[encodedByte];
+    } else {
+      throw new Error(`Cannot decode unrecognized sequence ${encodedByte} as hexadecimal`);
+    }
+  }
+
+  return out;
+}