feat: NextAuth credentials + JWT 8h + rate limiting

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/__tests__/lib/auth.test.ts

@@ -0,0 +1,68 @@
+import { authOptions } from '@/lib/auth'
+
+// Mock Prisma
+jest.mock('@/lib/prisma', () => ({
+  prisma: {
+    user: {
+      findUnique: jest.fn(),
+    },
+  },
+}))
+
+// Mock rate-limit
+jest.mock('@/lib/rate-limit', () => ({
+  checkRateLimit: jest.fn(() => true),
+  recordFailedAttempt: jest.fn(),
+  clearAttempts: jest.fn(),
+}))
+
+import { prisma } from '@/lib/prisma'
+import { checkRateLimit, recordFailedAttempt, clearAttempts } from '@/lib/rate-limit'
+
+const mockFindUnique = prisma.user.findUnique as jest.Mock
+
+describe('NextAuth authorize', () => {
+  const authorize = (authOptions.providers[0] as any).options.authorize
+
+  beforeEach(() => jest.clearAllMocks())
+
+  it('retourne null si credentials manquants', async () => {
+    const result = await authorize({ email: '', password: '' }, {})
+    expect(result).toBeNull()
+  })
+
+  it('retourne null si utilisateur introuvable', async () => {
+    mockFindUnique.mockResolvedValue(null)
+    const result = await authorize(
+      { email: 'a@b.com', password: 'wrong' },
+      { headers: {} }
+    )
+    expect(result).toBeNull()
+    expect(recordFailedAttempt).toHaveBeenCalled()
+  })
+
+  it('retourne l\'utilisateur si mot de passe correct', async () => {
+    const { hash } = await import('bcryptjs')
+    const hashedPwd = await hash('correct', 12)
+    mockFindUnique.mockResolvedValue({
+      id: 'user1',
+      email: 'a@b.com',
+      name: 'Alice',
+      role: 'gestionnaire',
+      password: hashedPwd,
+    })
+    const result = await authorize(
+      { email: 'a@b.com', password: 'correct' },
+      { headers: {} }
+    )
+    expect(result).toEqual({ id: 'user1', email: 'a@b.com', name: 'Alice', role: 'gestionnaire' })
+    expect(clearAttempts).toHaveBeenCalled()
+  })
+
+  it('lève RATE_LIMITED si bloqué', async () => {
+    ;(checkRateLimit as jest.Mock).mockReturnValue(false)
+    await expect(
+      authorize({ email: 'a@b.com', password: 'x' }, { headers: {} })
+    ).rejects.toThrow('RATE_LIMITED')
+  })
+})