@owlrelay/webhook/dist/index.mjs

OwlRelay Webhook utilities

import { fetch } from 'ofetch';

function arrayBufferToBase64(arrayBuffer) {
  return btoa(String.fromCharCode(...new Uint8Array(arrayBuffer)));
}
function base64ToArrayBuffer(base64) {
  return new Uint8Array(atob(base64).split("").map((char) => char.charCodeAt(0))).buffer;
}
async function signBody({
  bodyBuffer,
  secret
}) {
  const encoder = new TextEncoder();
  const keyData = encoder.encode(secret);
  const key = await crypto.subtle.importKey("raw", keyData, { name: "HMAC", hash: "SHA-256" }, false, ["sign"]);
  const signature = await crypto.subtle.sign("HMAC", key, bodyBuffer);
  const signatureBase64 = arrayBufferToBase64(signature);
  return { signature: signatureBase64 };
}
async function verifySignature({
  bodyBuffer,
  signature: base64Signature,
  secret
}) {
  const encoder = new TextEncoder();
  const keyData = encoder.encode(secret);
  const key = await crypto.subtle.importKey("raw", keyData, { name: "HMAC", hash: "SHA-256" }, false, ["verify"]);
  const signatureBuffer = base64ToArrayBuffer(base64Signature);
  return crypto.subtle.verify("HMAC", key, signatureBuffer, bodyBuffer);
}

function serializeEmailForWebhook({ email }) {
  const body = new FormData();
  const { attachments = [], ...rest } = email;
  body.append("email", JSON.stringify(rest));
  for (const attachment of attachments ?? []) {
    body.append("attachments[]", new File([attachment.content], attachment.filename ?? "file", { type: attachment.mimeType }));
  }
  return { body };
}

async function triggerWebhook({
  email,
  webhookUrl,
  webhookSecret,
  httpClient = fetch
}) {
  const { body } = serializeEmailForWebhook({ email });
  const bodyResponse = new Response(body);
  const headers = Object.fromEntries(bodyResponse.headers.entries());
  const bodyBuffer = await bodyResponse.arrayBuffer();
  if (webhookSecret) {
    const { signature } = await signBody({ bodyBuffer, secret: webhookSecret });
    headers["X-Signature"] = signature;
  }
  const response = await httpClient(
    webhookUrl,
    {
      method: "POST",
      body: bodyBuffer,
      headers: {
        "User-Agent": "owlrelay-webhook-client",
        ...headers
      }
    }
  );
  return response;
}

export { serializeEmailForWebhook, signBody, triggerWebhook, verifySignature };
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