add auth

src/app/api/auth/register/route.ts

@@ -0,0 +1,59 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getSessionOptions, hashPassword, type SessionData } from '@/lib/auth'
+import { getIronSession } from 'iron-session'
+import { getUserCount, createUser } from '@/lib/users'
+
+export async function POST(request: NextRequest) {
+  let body: { username?: string; password?: string; role?: string }
+  try {
+    body = await request.json()
+  } catch {
+    return NextResponse.json({ error: 'Invalid JSON body' }, { status: 400 })
+  }
+
+  const { username, password } = body
+  let { role } = body
+
+  if (!username || !password) {
+    return NextResponse.json({ error: 'username and password are required' }, { status: 400 })
+  }
+  if (username.trim().length < 2) {
+    return NextResponse.json({ error: 'Username must be at least 2 characters' }, { status: 400 })
+  }
+  if (password.length < 8) {
+    return NextResponse.json({ error: 'Password must be at least 8 characters' }, { status: 400 })
+  }
+
+  const userCount = getUserCount()
+
+  if (userCount === 0) {
+    // First user always becomes admin
+    role = 'admin'
+  } else {
+    // Subsequent users require an admin session
+    const res = new NextResponse()
+    const session = await getIronSession<SessionData>(request, res, getSessionOptions())
+    if (!session.userId) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+    if (session.role !== 'admin') {
+      return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+    }
+    if (role !== 'admin' && role !== 'user') {
+      role = 'user'
+    }
+  }
+
+  const passwordHash = await hashPassword(password)
+
+  try {
+    const user = createUser(username.trim(), passwordHash, role as 'admin' | 'user')
+    return NextResponse.json({ id: user.id, username: user.username, role: user.role }, { status: 201 })
+  } catch (err) {
+    const message = err instanceof Error ? err.message : 'Failed to create user'
+    if (message.includes('UNIQUE constraint failed')) {
+      return NextResponse.json({ error: 'Username already taken' }, { status: 409 })
+    }
+    return NextResponse.json({ error: message }, { status: 400 })
+  }
+}