Next.js で見込み客を選別するリードフォームを作る

app/
  contact-sales/
    page.tsx
    actions.ts
    lead-form.tsx
    thanks/page.tsx
lib/
  lead.ts
proxy.ts
.env.local

IKIFORM_SECRET_KEY=ik_sk_your_secret_key

import { type NextRequest, NextResponse } from "next/server";

const TAGS = ["utm_source", "utm_medium", "utm_campaign"];

export function proxy(request: NextRequest) {
  const response = NextResponse.next();
  if (request.cookies.has("lead_source")) return response;

  const url = request.nextUrl;
  const referer = request.headers.get("referer") ?? "";
  const from = URL.canParse(referer) ? new URL(referer) : null;
  const external = from && from.host !== url.host ? from.href : "";
  const source = new URLSearchParams();
  for (const tag of TAGS) source.set(tag, url.searchParams.get(tag)?.slice(0, 100) ?? "");
  if (!external && !TAGS.some((tag) => source.get(tag))) return response;

  source.set("referrer", external.slice(0, 300));
  source.set("landing_page", url.pathname.slice(0, 200));
  response.cookies.set("lead_source", source.toString(), {
    httpOnly: true,
    sameSite: "lax",
    path: "/",
    maxAge: 60 * 60 * 24 * 30,
  });
  return response;
}

export const config = {
  matcher: [
    {
      source: "/((?!api|_next/static|_next/image|favicon.ico).*)",
      missing: [
        { type: "header", key: "next-router-prefetch" },
        { type: "header", key: "purpose", value: "prefetch" },
      ],
    },
  ],
};

import { z } from "zod";

export const LeadSchema = z.object({
  name: z.string().trim().min(1, "Tell us who to reply to.").max(120),
  email: z.email("Enter a work email we can reply to."),
  company: z.string().trim().min(1, "Which company is this for?").max(200),
  company_size: z.enum(["1_10", "11_50", "51_200", "201_1000", "1000_plus"], { error: "Pick a company size." }),
  budget: z.enum(["under_10k", "10k_50k", "50k_plus", "unsure"], { error: "Pick a budget range." }),
  timeline: z.enum(["this_quarter", "next_quarter", "later", "researching"], { error: "Pick a timeline." }),
  message: z.string().trim().max(5000).optional(),
});

export type Lead = z.infer<typeof LeadSchema>;

export function isQualified(lead: Lead) {
  const bigEnough = lead.company_size !== "1_10";
  const funded = lead.budget === "10k_50k" || lead.budget === "50k_plus";
  const soon = lead.timeline === "this_quarter" || lead.timeline === "next_quarter";
  return bigEnough && funded && soon;
}

"use server";

import { cookies, headers } from "next/headers";
import { redirect } from "next/navigation";
import { z } from "zod";
import { isQualified, LeadSchema } from "@/lib/lead";

export interface LeadState {
  errors: Record<string, string>;
  values: Record<string, string>;
}

const SOURCE = ["utm_source", "utm_medium", "utm_campaign", "referrer", "landing_page"];

export async function submitLead(_previous: LeadState, formData: FormData): Promise<LeadState> {
  const values = Object.fromEntries([...formData].map(([key, value]) => [key, String(value)]));
  const parsed = LeadSchema.safeParse(values);
  if (!parsed.success) {
    const { fieldErrors } = z.flattenError(parsed.error);
    const errors = Object.fromEntries(Object.entries(fieldErrors).map(([key, list]) => [key, list?.[0] ?? ""]));
    return { errors, values };
  }

  const stored = new URLSearchParams((await cookies()).get("lead_source")?.value ?? "");
  const source = Object.fromEntries(SOURCE.map((key) => [key, stored.get(key) ?? ""]));
  const origin = (await headers()).get("origin");
  const qualified = isQualified(parsed.data);

  const 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: origin } : {}),
    },
    body: JSON.stringify({
      ...parsed.data,
      ...source,
      fit: qualified ? "qualified" : "nurture",
      _gotcha: values._gotcha ?? "",
    }),
    signal: AbortSignal.timeout(8000),
  }).catch(() => null);
  const result = await response?.json().catch(() => null);

  if (!result?.ok) {
    const fields: Record<string, string[]> = result?.error?.fields ?? {};
    const errors = Object.fromEntries(Object.entries(fields).map(([key, list]) => [key, list[0] ?? ""]));
    if (!Object.keys(errors).length) errors.form = "We couldn't send that. Email sales@example.com instead.";
    return { errors, values };
  }

  if (!qualified || values._gotcha) redirect("/contact-sales/thanks");
  const { name, email } = parsed.data;
  redirect(`https://cal.com/acme/intro?${new URLSearchParams({ name, email })}`);
}

"use client";

import { useActionState } from "react";
import { type LeadState, submitLead } from "./actions";

const initial: LeadState = { errors: {}, values: {} };

function FieldError({ message }: { message?: string }) {
  return message ? <p role="alert">{message}</p> : null;
}

export function LeadForm() {
  const [state, action, pending] = useActionState(submitLead, initial);
  const { errors, values } = state;

  return (
    <form action={action}>
      <label htmlFor="name">Name</label>
      <input id="name" name="name" autoComplete="name" required defaultValue={values.name} />
      <FieldError message={errors.name} />

      <label htmlFor="email">Work email</label>
      <input id="email" name="email" type="email" autoComplete="email" required defaultValue={values.email} />
      <FieldError message={errors.email} />

      <label htmlFor="company">Company</label>
      <input id="company" name="company" autoComplete="organization" required defaultValue={values.company} />
      <FieldError message={errors.company} />

      <label htmlFor="company_size">Company size</label>
      <select id="company_size" name="company_size" required defaultValue={values.company_size ?? ""} key={values.company_size}>
        <option value="" disabled>Choose one</option>
        <option value="1_10">1 to 10</option>
        <option value="11_50">11 to 50</option>
        <option value="51_200">51 to 200</option>
        <option value="201_1000">201 to 1,000</option>
        <option value="1000_plus">More than 1,000</option>
      </select>
      <FieldError message={errors.company_size} />

      <label htmlFor="budget">Budget</label>
      <select id="budget" name="budget" required defaultValue={values.budget ?? ""} key={values.budget}>
        <option value="" disabled>Choose one</option>
        <option value="under_10k">Under $10k</option>
        <option value="10k_50k">$10k to $50k</option>
        <option value="50k_plus">More than $50k</option>
        <option value="unsure">Not sure yet</option>
      </select>
      <FieldError message={errors.budget} />

      <label htmlFor="timeline">When do you want to start?</label>
      <select id="timeline" name="timeline" required defaultValue={values.timeline ?? ""} key={values.timeline}>
        <option value="" disabled>Choose one</option>
        <option value="this_quarter">This quarter</option>
        <option value="next_quarter">Next quarter</option>
        <option value="later">Later this year</option>
        <option value="researching">Researching for now</option>
      </select>
      <FieldError message={errors.timeline} />

      <label htmlFor="message">Anything we should know?</label>
      <textarea id="message" name="message" rows={4} defaultValue={values.message} />

      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      <FieldError message={errors.form} />
      <button disabled={pending}>{pending ? "Sending" : "Talk to sales"}</button>
    </form>
  );
}

import { LeadForm } from "./lead-form";

export default function ContactSales() {
  return (
    <main>
      <h1>Talk to sales</h1>
      <p>Tell us a little about your team. If we look like a fit, you pick a call time on the next screen.</p>
      <LeadForm />
    </main>
  );
}