discordeno/packages/utils/src/verifySignature.ts

import { verify } from 'https://unpkg.com/@evan/wasm@0.0.93/target/ed25519/deno.js'

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
}