cleanup interaction helper

src/helpers/interactions/verify_signature.ts

@@ -0,0 +1,27 @@
+export { verify } from "https://unpkg.com/@evan/wasm@0.0.65/target/ed25519/deno.js";
+import { verify } from "./deps.ts";
+
+export function verifySignature({ publicKey, signature, timestamp, body }: VerifySignatureOptions): {
+  isValid: boolean;
+  body: string;
+} {
+  const isValid = verify(
+    hexToUint8Array(publicKey),
+    hexToUint8Array(signature),
+    new TextEncoder().encode(timestamp + body)
+  );
+
+  return { isValid, body };
+}
+
+/** Converts a hexadecimal string to Uint8Array. */
+function hexToUint8Array(hex: string) {
+  return new Uint8Array(hex.match(/.{1,2}/g)!.map((val) => parseInt(val, 16)));
+}
+
+export interface VerifySignatureOptions {
+  publicKey: string;
+  signature: string;
+  timestamp: string;
+  body: string;
+}