@yohangel / auth-next

1.0.0 ▾

1.0.0

MIT

GitHub

Next.js App Router 用 Better Auth：ルートハンドラー、proxy リダイレクト、サーバー側セッション

コード5 ファイルコンテキスト約 545 トークンスキャン合格

約 545 トークン→ src/lib/auth-next/AGENTS.md→ .cursor/rules/genpm-yohangel-auth-next.mdc

これは AI が src/lib/auth-next で作業するときに読む内容そのものです。それ以外はコンテキストに追加されません。

@yohangel/auth-next — rules for AI agents

Purpose

Connects @yohangel/auth to the Next.js App Router (Next 15/16): the /api/auth/* route handler, optimistic redirects in proxy.ts, and server-side session helpers. For forms and useSession, also install @yohangel/auth-react.

Module map

index.ts — public API.
server.ts — auth (instance with nextCookies()), authRouteHandlers, currentSession(), requireSession(signInPath, next), createNextAuth(opts).
proxy.ts — authProxy({ protect, signInPath }) and safeNext(next).

Integration (do this after installing)

Route handler — create app/api/auth/[...all]/route.ts (or src/app/...):

import { authRouteHandlers } from '@/lib/auth-next';
export const { GET, POST } = authRouteHandlers;

Edge redirects — create proxy.ts at the project root (Next 16; on Next 15 name it middleware.ts and export middleware):

import { authProxy } from '@/lib/auth-next';
export const proxy = authProxy({ protect: ['/dashboard', '/settings'], signInPath: '/sign-in' });
export const config = { matcher: ['/dashboard/:path*', '/settings/:path*'] };

In every private page, layout, Route Handler and Server Action, check for real: const { user } = await requireSession('/sign-in', '/dashboard');.
Sign-in page: render SignInForm from @yohangel/auth-react with redirectTo={safeNext(searchParams.next)}.
Need emails or extra plugins? Edit server.ts: export const auth = createNextAuth({ sendEmail, plugins: [...] }) — nextCookies() is appended last automatically.

Conventions

Import the instance from this package (auth), never call createAuth again elsewhere in a Next app.
Server Components read the session with currentSession(); pass only the fields the client needs (never the session token).

Don't

Don't treat proxy.ts as authorization: it only checks that a cookie exists. Always call requireSession() / currentSession() on the server.
Don't redirect to ?next= values without safeNext() (open redirect).
Don't expose auth.api calls in Client Components; they run on the server only.

# @yohangel/auth-next — rules for AI agents

## Purpose
Connects `@yohangel/auth` to the Next.js App Router (Next 15/16): the `/api/auth/*` route handler, optimistic redirects in `proxy.ts`, and server-side session helpers. For forms and `useSession`, also install `@yohangel/auth-react`.

## Module map
- `index.ts` — public API.
- `server.ts` — `auth` (instance with `nextCookies()`), `authRouteHandlers`, `currentSession()`, `requireSession(signInPath, next)`, `createNextAuth(opts)`.
- `proxy.ts` — `authProxy({ protect, signInPath })` and `safeNext(next)`.

## Integration (do this after installing)
1. Route handler — create `app/api/auth/[...all]/route.ts` (or `src/app/...`):
   ```ts
   import { authRouteHandlers } from '@/lib/auth-next';
   export const { GET, POST } = authRouteHandlers;
   ```
2. Edge redirects — create `proxy.ts` at the project root (Next 16; on Next 15 name it `middleware.ts` and export `middleware`):
   ```ts
   import { authProxy } from '@/lib/auth-next';
   export const proxy = authProxy({ protect: ['/dashboard', '/settings'], signInPath: '/sign-in' });
   export const config = { matcher: ['/dashboard/:path*', '/settings/:path*'] };
   ```
3. In every private page, layout, Route Handler and Server Action, check for real: `const { user } = await requireSession('/sign-in', '/dashboard');`.
4. Sign-in page: render `SignInForm` from `@yohangel/auth-react` with `redirectTo={safeNext(searchParams.next)}`.
5. Need emails or extra plugins? Edit `server.ts`: `export const auth = createNextAuth({ sendEmail, plugins: [...] })` — `nextCookies()` is appended last automatically.

## Conventions
- Import the instance from this package (`auth`), never call `createAuth` again elsewhere in a Next app.
- Server Components read the session with `currentSession()`; pass only the fields the client needs (never the session token).

## Don't
- Don't treat `proxy.ts` as authorization: it only checks that a cookie exists. Always call `requireSession()` / `currentSession()` on the server.
- Don't redirect to `?next=` values without `safeNext()` (open redirect).
- Don't expose `auth.api` calls in Client Components; they run on the server only.

.genpmignore 適用後に組み込まれる正確なツリーです。固定先:

src/lib/auth-next/LICENSE読み取り専用 · 7145b9d

MIT License

Copyright (c) 2026 Yohangel

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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SOFTWARE.