React Router でアプリ内フィードバックフォームを作る

app/
  routes.ts
  sessions.server.ts
  components/
    feedback-form.tsx
  routes/
    api.feedback.ts
    app-layout.tsx
    project-settings.tsx

import { layout, route, type RouteConfig } from "@react-router/dev/routes";

export default [
  route("api/feedback", "routes/api.feedback.ts"),
  layout("routes/app-layout.tsx", [route("projects/:id/settings", "routes/project-settings.tsx")]),
] satisfies RouteConfig;

IKIFORM_SECRET_KEY=ik_sk_your_secret_key
SESSION_SECRET=a-long-random-string

import { createCookieSessionStorage } from "react-router";

interface SessionData {
  userId: string;
  email: string;
}

export const { getSession, commitSession, destroySession } = createCookieSessionStorage<SessionData>({
  cookie: {
    name: "__session",
    httpOnly: true,
    path: "/",
    sameSite: "lax",
    secrets: [process.env.SESSION_SECRET ?? ""],
    secure: process.env.NODE_ENV === "production",
  },
});

export async function readUser(request: Request) {
  const session = await getSession(request.headers.get("Cookie"));
  const id = session.get("userId");
  const email = session.get("email");
  return id && email ? { id, email } : null;
}

import { data, redirect } from "react-router";
import { readUser } from "~/sessions.server";
import type { Route } from "./+types/api.feedback";

const SCREEN = /^[a-z0-9/._-]{1,120}$/;

function samePage(referer: string | null, origin: string) {
  try {
    const url = new URL(referer ?? "");
    return url.origin === origin ? url.pathname : "";
  } catch {
    return "";
  }
}

export async function action({ request }: Route.ActionArgs) {
  const form = await request.formData();
  const origin = new URL(request.url).origin;
  const path = samePage(request.headers.get("Referer"), origin);
  const native = request.headers.get("Sec-Fetch-Mode") === "navigate";

  function reply(status: "sent" | "error", message: string, code = 200) {
    if (native) return redirect(`${path || "/"}?feedback=${status}`);
    return data({ status, message }, { status: code });
  }

  const user = await readUser(request);
  if (!user) return reply("error", "You were signed out. Sign in, then send it again.", 401);

  const rating = Number(form.get("rating"));
  if (!Number.isInteger(rating) || rating < 1 || rating > 5) return reply("error", "Choose a score first.", 400);
  const screen = String(form.get("screen") ?? "");

  let response: Response;
  try {
    response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
      method: "POST",
      headers: {
        Accept: "application/json",
        "Content-Type": "application/json",
        Authorization: `Bearer ${process.env.IKIFORM_SECRET_KEY}`,
        Origin: origin,
      },
      body: JSON.stringify({
        rating,
        comment: String(form.get("comment") ?? "").slice(0, 4000),
        page: path ? origin + path : "",
        screen: SCREEN.test(screen) ? screen : "unknown",
        user_id: user.id,
        email: user.email,
        _gotcha: String(form.get("_gotcha") ?? ""),
      }),
      signal: AbortSignal.timeout(8000),
    });
  } catch {
    return reply("error", "Feedback is unreachable right now. Try again shortly.", 502);
  }

  const result = await response.json().catch(() => null);
  if (result?.ok) return reply("sent", "Got it. Thank you.");
  return reply("error", result?.error?.fields?.comment?.[0] ?? result?.error?.message ?? "That didn't go through.", 502);
}

import { useFetcher, useMatches, useSearchParams } from "react-router";
import type { action } from "~/routes/api.feedback";

const SCORES = ["Blocked", "Painful", "Okay", "Smooth", "Excellent"];

function useScreen() {
  const named = useMatches().flatMap((match) => {
    const screen = (match.handle as { screen?: string } | undefined)?.screen;
    return screen ? [screen] : [];
  });
  return named.at(-1) ?? "unknown";
}

export function FeedbackForm() {
  const screen = useScreen();
  const fetcher = useFetcher<typeof action>({ key: `feedback:${screen}` });
  const [params] = useSearchParams();
  const busy = fetcher.state !== "idle";
  const fallback = params.get("feedback");
  const sent = fetcher.data?.status === "sent" || fallback === "sent";
  const error = fetcher.data?.status === "error" ? fetcher.data.message : fallback === "error" ? "That didn't go through." : "";

  if (sent) return <p role="status">Got it. Thank you.</p>;

  return (
    <fetcher.Form method="post" action="/api/feedback" aria-busy={busy}>
      <fieldset>
        <legend>How is this screen working for you?</legend>
        {SCORES.map((label, index) => (
          <label key={label}>
            <input type="radio" name="rating" value={index + 1} required /> {label}
          </label>
        ))}
      </fieldset>
      <label htmlFor="feedback-comment">What would make it better?</label>
      <textarea id="feedback-comment" name="comment" rows={3} maxLength={4000} />
      <input type="hidden" name="screen" value={screen} />
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {error ? <p role="alert">{error}</p> : null}
      <button disabled={busy}>{busy ? "Sending" : "Send feedback"}</button>
    </fetcher.Form>
  );
}

import { Outlet } from "react-router";
import { FeedbackForm } from "~/components/feedback-form";

export default function AppLayout() {
  return (
    <>
      <Outlet />
      <aside aria-label="Feedback">
        <FeedbackForm />
      </aside>
    </>
  );
}

export const handle = { screen: "projects/settings" };

export default function ProjectSettings() {
  return <h1>Project settings</h1>;
}