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import { NextRequest, NextResponse } from "next/server";
import { db, eq } from "@opencut/db";
import { waitlist } from "@opencut/db/schema";
import { checkBotId } from "botid/server";
import { nanoid } from "nanoid";
import { waitlistRateLimit } from "@/lib/rate-limit";
import { z } from "zod";
import { env } from "@/env";
import { cookies } from "next/headers";
import crypto from "crypto";
const waitlistSchema = z.object({
email: z.string().email("Invalid email format").min(1, "Email is required"),
});
const CSRF_TOKEN_NAME = "waitlist-csrf";
const TOKEN_EXPIRY = 60 * 60 * 1000;
function validateBrowserRequest(request: NextRequest): boolean {
const origin = request.headers.get("origin");
const referer = request.headers.get("referer");
const userAgent = request.headers.get("user-agent") || "";
const secFetchSite = request.headers.get("sec-fetch-site");
const secFetchMode = request.headers.get("sec-fetch-mode");
const secFetchDest = request.headers.get("sec-fetch-dest");
const contentType = request.headers.get("content-type");
const accept = request.headers.get("accept");
if (env.NODE_ENV === "development") {
console.log("=== Validating Browser Request ===");
console.log("Origin:", origin);
console.log("Referer:", referer);
console.log("User-Agent:", userAgent);
console.log("Sec-Fetch-Site:", secFetchSite);
console.log("Sec-Fetch-Mode:", secFetchMode);
console.log("Sec-Fetch-Dest:", secFetchDest);
console.log("Content-Type:", contentType);
console.log("Accept:", accept);
}
const allowedOrigins =
env.NODE_ENV === "development" ? ["http://localhost:3000", "http://127.0.0.1:3000"] : ["https://opencut.app", "https://www.opencut.app"];
if (!origin || !allowedOrigins.includes(origin)) {
console.log("Failed: Invalid origin");
return false;
}
if (!referer || !referer.startsWith(origin)) {
console.log("Failed: Invalid referer");
return false;
}
const suspiciousUserAgents = [
"curl",
"wget",
"postman",
"insomnia",
"thunder client",
"httpie",
"python-requests",
"node-fetch",
"axios",
"scrapy",
"httpclient",
"okhttp",
"libwww-perl",
"python-urllib",
"go-http-client",
"java/",
"apache-httpclient",
];
const lowerUserAgent = userAgent.toLowerCase();
if (!userAgent || suspiciousUserAgents.some((agent) => lowerUserAgent.includes(agent))) {
console.log("Failed: Suspicious user agent");
return false;
}
const hasBrowserIndicators =
lowerUserAgent.includes("mozilla/") ||
lowerUserAgent.includes("chrome/") ||
lowerUserAgent.includes("safari/") ||
lowerUserAgent.includes("firefox/") ||
lowerUserAgent.includes("edge/");
if (!hasBrowserIndicators) {
console.log("Failed: No browser indicators in user agent");
return false;
}
if (secFetchSite && secFetchSite !== "same-origin") {
console.log("Failed: Invalid Sec-Fetch-Site:", secFetchSite);
return false;
}
if (secFetchMode && secFetchMode !== "cors") {
console.log("Failed: Invalid Sec-Fetch-Mode:", secFetchMode);
return false;
}
if (secFetchDest && secFetchDest !== "empty") {
console.log("Failed: Invalid Sec-Fetch-Dest:", secFetchDest);
return false;
}
if (!contentType || !contentType.includes("application/json")) {
console.log("Failed: Invalid Content-Type");
return false;
}
if (!accept || (!accept.includes("application/json") && !accept.includes("*/*"))) {
console.log("Failed: Invalid Accept header");
return false;
}
console.log("Browser validation passed!");
return true;
}
async function validateCSRFToken(request: NextRequest): Promise<boolean> {
const clientToken = request.headers.get("x-csrf-token");
if (!clientToken) return false;
const cookieStore = await cookies();
const cookieValue = cookieStore.get(CSRF_TOKEN_NAME)?.value;
if (!cookieValue) return false;
const [token, timestamp, signature] = cookieValue.split(":");
if (!token || !timestamp || !signature) return false;
if (clientToken !== token) return false;
const now = Date.now();
const tokenTime = parseInt(timestamp);
if (now - tokenTime > TOKEN_EXPIRY) return false;
const expectedSignature = crypto.createHmac("sha256", env.BETTER_AUTH_SECRET).update(`${token}:${timestamp}`).digest("hex");
return signature === expectedSignature;
}
export async function POST(request: NextRequest) {
const verification = await checkBotId();
if (verification.isBot) {
return NextResponse.json({ error: "Access denied" }, { status: 403 });
}
const identifier = request.headers.get("x-forwarded-for") ?? "127.0.0.1";
const { success } = await waitlistRateLimit.limit(identifier);
if (!success) {
return NextResponse.json({ error: "Too many requests. Please try again later." }, { status: 429 });
}
if (!validateBrowserRequest(request)) {
await new Promise((resolve) => setTimeout(resolve, Math.random() * 2000 + 1000));
return NextResponse.json({ error: "Invalid request" }, { status: 403 });
}
const isValidToken = await validateCSRFToken(request);
if (!isValidToken) {
return NextResponse.json({ error: "Invalid security token" }, { status: 403 });
}
try {
const body = await request.json();
const { email } = waitlistSchema.parse(body);
const existingEmail = await db.select().from(waitlist).where(eq(waitlist.email, email.toLowerCase())).limit(1);
if (existingEmail.length > 0) {
return NextResponse.json({ error: "Email already registered" }, { status: 409 });
}
await db.insert(waitlist).values({
id: nanoid(),
email: email.toLowerCase(),
});
return NextResponse.json({ message: "Successfully joined waitlist!" }, { status: 201 });
} catch (error) {
if (error instanceof z.ZodError) {
const firstError = error.errors[0];
return NextResponse.json({ error: firstError.message }, { status: 400 });
}
console.error("Waitlist signup error:", error);
return NextResponse.json({ error: "Internal server error" }, { status: 500 });
}
}
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