Spearly CMSのWebhookのエンドポイントをCloud Functionsで作る

import * as functions from "firebase-functions";
import {Octokit} from "@octokit/core";
import * as crypto from "crypto";

const GITHUB_TOKEN = process.env.GITHUB_TOKEN ?? "";
const WEBHOOK_SECRET = process.env.WEBHOOK_SECRET ?? "";

type SIGNATURE = `sha256=${string}`

const octokit = new Octokit({auth: GITHUB_TOKEN});

const generateRequestSignature = (body: string): SIGNATURE => {
  const hash = crypto.createHmac("sha256", WEBHOOK_SECRET)
      .update(JSON.stringify(body))
      .digest("hex");
  return `sha256=${hash}`;
};

const owner = "ユーザー名";
const repo = "リポジトリ名";
const eventType = "イベント名";

export const deploy = functions.https.onRequest(async (request, response) => {
  if (request.method !== "POST") {
    response.status(405).send("Invalid method");
    return;
  }

  const signature = request.headers["x-spy-signature-256"] as SIGNATURE;
  const computedSignature = generateRequestSignature(request.body);
  if (signature !== computedSignature) {
    response.status(403).send("Invalid signature");
    return;
  }

  try {
    await octokit.request("POST /repos/{owner}/{repo}/dispatches", {
      owner: owner,
      repo: repo,
      event_type: eventType,
    });
  } catch (error: any) {
    functions.logger.error(error, {structuredData: true});
    console.error(error);
  }
});