cal/pages/404.tsx

import { BookOpenIcon, CheckIcon, CodeIcon, DocumentTextIcon } from "@heroicons/react/outline";
import { ChevronRightIcon } from "@heroicons/react/solid";
import { GetStaticPropsContext } from "next";
import Link from "next/link";
import { useRouter } from "next/router";
import React from "react";

import { useLocale } from "@lib/hooks/useLocale";

import { HeadSeo } from "@components/seo/head-seo";

import { ssgInit } from "@server/lib/ssg";

export default function Custom404() {
  const { t } = useLocale();
  const router = useRouter();
  const username = router.asPath.replace("%20", "-");
  const links = [
    {
      title: t("documentation"),
      description: t("documentation_description"),
      icon: DocumentTextIcon,
      href: "https://docs.cal.com",
    },
    {
      title: t("api_reference"),
      description: t("api_reference_description"),
      icon: CodeIcon,
      href: "https://developer.cal.com",
    },
    {
      title: t("blog"),
      description: t("blog_description"),
      icon: BookOpenIcon,
      href: "https://cal.com/blog",
    },
  ];

  const isSubpage = router.asPath.includes("/", 2);

  return (
    <>
      <HeadSeo
        title={t("404_page_not_found")}
        description={t("404_page_not_found")}
        nextSeoProps={{
          nofollow: true,
          noindex: true,
        }}
      />
      <div className="min-h-screen px-4 bg-white">
        <main className="max-w-xl pt-16 pb-6 mx-auto sm:pt-24">
          <div className="text-center">
            <p className="text-sm font-semibold tracking-wide text-black uppercase">404 error</p>
            <h1 className="mt-2 text-4xl font-extrabold tracking-tight text-gray-900 font-cal sm:text-5xl">
              {t("page_doesnt_exist")}
            </h1>
            {isSubpage ? (
              <span className="inline-block mt-2 text-lg ">{t("check_spelling_mistakes_or_go_back")}</span>
            ) : process.env.NEXT_PUBLIC_BASE_URL == "https://app.cal.com" ? (
              <a
                href={"https://cal.com/signup?username=" + username.replace("/", "")}
                className="inline-block mt-2 text-lg ">
                {t("the_username")} <strong className="text-blue-500">cal.com{username}</strong>{" "}
                {t("is_still_available")} <span className="text-blue-500">{t("register_now")}</span>.
              </a>
            ) : (
              <>
                {t("the_username")}{" "}
                <strong className="text-green-500">
                  {new URL(process.env.NEXT_PUBLIC_BASE_URL || "").hostname}
                  {username}
                </strong>{" "}
                {t("is_still_available")}
              </>
            )}
          </div>
          <div className="mt-12">
            <h2 className="text-sm font-semibold tracking-wide text-gray-500 uppercase">
              {t("popular_pages")}
            </h2>
            {!isSubpage && process.env.NEXT_PUBLIC_BASE_URL == "https://app.cal.com" && (
              <ul role="list" className="mt-4">
                <li className="px-4 py-2 border-2 border-green-500">
                  <a
                    href={"https://cal.com/signup?username=" + username.replace("/", "")}
                    className="relative flex items-start py-6 space-x-4">
                    <div className="flex-shrink-0">
                      <span className="flex items-center justify-center w-12 h-12 rounded-lg bg-green-50">
                        <CheckIcon className="w-6 h-6 text-green-500" aria-hidden="true" />
                      </span>
                    </div>
                    <div className="flex-1 min-w-0">
                      <h3 className="text-base font-medium text-gray-900">
                        <span className="rounded-sm focus-within:ring-2 focus-within:ring-offset-2 focus-within:ring-gray-500">
                          <span className="focus:outline-none">
                            <span className="absolute inset-0" aria-hidden="true" />
                            {t("register")} <strong className="text-green-500">{username}</strong>
                          </span>
                        </span>
                      </h3>
                      <p className="text-base text-gray-500">{t("claim_username_and_schedule_events")}</p>
                    </div>
                    <div className="self-center flex-shrink-0">
                      <ChevronRightIcon className="w-5 h-5 text-gray-400" aria-hidden="true" />
                    </div>
                  </a>
                </li>
              </ul>
            )}

            <ul role="list" className="mt-4 border-gray-200 divide-y divide-gray-200">
              {links.map((link, linkIdx) => (
                <li key={linkIdx} className="px-4 py-2">
                  <Link href={link.href}>
                    <a className="relative flex items-start py-6 space-x-4">
                      <div className="flex-shrink-0">
                        <span className="flex items-center justify-center w-12 h-12 rounded-lg bg-gray-50">
                          <link.icon className="w-6 h-6 text-gray-700" aria-hidden="true" />
                        </span>
                      </div>
                      <div className="flex-1 min-w-0">
                        <h3 className="text-base font-medium text-gray-900">
                          <span className="rounded-sm focus-within:ring-2 focus-within:ring-offset-2 focus-within:ring-gray-500">
                            <span className="absolute inset-0" aria-hidden="true" />
                            {link.title}
                          </span>
                        </h3>
                        <p className="text-base text-gray-500">{link.description}</p>
                      </div>
                      <div className="self-center flex-shrink-0">
                        <ChevronRightIcon className="w-5 h-5 text-gray-400" aria-hidden="true" />
                      </div>
                    </a>
                  </Link>
                </li>
              ))}
              <li className="px-4 py-2">
                <a href="https://cal.com/slack" className="relative flex items-start py-6 space-x-4">
                  <div className="flex-shrink-0">
                    <span className="flex items-center justify-center w-12 h-12 rounded-lg bg-gray-50">
                      <svg viewBox="0 0 2447.6 2452.5" className="w-6 h-6" xmlns="http://www.w3.org/2000/svg">
                        <g clipRule="evenodd" fillRule="evenodd">
                          <path
                            d="m897.4 0c-135.3.1-244.8 109.9-244.7 245.2-.1 135.3 109.5 245.1 244.8 245.2h244.8v-245.1c.1-135.3-109.5-245.1-244.9-245.3.1 0 .1 0 0 0m0 654h-652.6c-135.3.1-244.9 109.9-244.8 245.2-.2 135.3 109.4 245.1 244.7 245.3h652.7c135.3-.1 244.9-109.9 244.8-245.2.1-135.4-109.5-245.2-244.8-245.3z"
                            fill="rgba(55, 65, 81)"></path>
                          <path
                            d="m2447.6 899.2c.1-135.3-109.5-245.1-244.8-245.2-135.3.1-244.9 109.9-244.8 245.2v245.3h244.8c135.3-.1 244.9-109.9 244.8-245.3zm-652.7 0v-654c.1-135.2-109.4-245-244.7-245.2-135.3.1-244.9 109.9-244.8 245.2v654c-.2 135.3 109.4 245.1 244.7 245.3 135.3-.1 244.9-109.9 244.8-245.3z"
                            fill="rgba(55, 65, 81)"></path>
                          <path
                            d="m1550.1 2452.5c135.3-.1 244.9-109.9 244.8-245.2.1-135.3-109.5-245.1-244.8-245.2h-244.8v245.2c-.1 135.2 109.5 245 244.8 245.2zm0-654.1h652.7c135.3-.1 244.9-109.9 244.8-245.2.2-135.3-109.4-245.1-244.7-245.3h-652.7c-135.3.1-244.9 109.9-244.8 245.2-.1 135.4 109.4 245.2 244.7 245.3z"
                            fill="rgba(55, 65, 81)"></path>
                          <path
                            d="m0 1553.2c-.1 135.3 109.5 245.1 244.8 245.2 135.3-.1 244.9-109.9 244.8-245.2v-245.2h-244.8c-135.3.1-244.9 109.9-244.8 245.2zm652.7 0v654c-.2 135.3 109.4 245.1 244.7 245.3 135.3-.1 244.9-109.9 244.8-245.2v-653.9c.2-135.3-109.4-245.1-244.7-245.3-135.4 0-244.9 109.8-244.8 245.1 0 0 0 .1 0 0"
                            fill="rgba(55, 65, 81)"></path>
                        </g>
                      </svg>
                    </span>
                  </div>
                  <div className="flex-1 min-w-0">
                    <h3 className="text-base font-medium text-gray-900">
                      <span className="rounded-sm focus-within:ring-2 focus-within:ring-offset-2 focus-within:ring-gray-500">
                        <span className="absolute inset-0" aria-hidden="true" />
                        Slack
                      </span>
                    </h3>
                    <p className="text-base text-gray-500">{t("join_our_community")}</p>
                  </div>
                  <div className="self-center flex-shrink-0">
                    <ChevronRightIcon className="w-5 h-5 text-gray-400" aria-hidden="true" />
                  </div>
                </a>
              </li>
            </ul>
            <div className="mt-8">
              <Link href="/">
                <a className="text-base font-medium text-black hover:text-gray-500">
                  {t("or_go_back_home")}
                  <span aria-hidden="true"> &rarr;</span>
                </a>
              </Link>
            </div>
          </div>
        </main>
      </div>
    </>
  );
}

export const getStaticProps = async (context: GetStaticPropsContext) => {
  const ssr = await ssgInit(context);

  return {
    props: {
      trpcState: ssr.dehydrate(),
    },
  };
};