Better Auth

import { betterAuth } from "better-auth";

export const auth = betterAuth({
  hooks: {
    before: {
      signUp: async (ctx) => {
        const { email } = ctx.body;

        try {
          const r = await fetch(
            `https://api.disposableguard.com/v1/check?email=${encodeURIComponent(email)}`,
            {
              headers: {
                Authorization: `Bearer ${process.env.DG_KEY}`,
              },
            }
          );
          if (r.ok) {
            const data = await r.json();
            if (data.is_disposable) {
              throw new Error("Please use a real email address.");
            }
          }
        } catch (e: any) {
          if (e.message === "Please use a real email address.") throw e;
          // fail-open
        }
      },
    },
  },
});