Google 계정 로그인 연동 추가

server/api/auth/google/start.get.js

@@ -0,0 +1,43 @@
+import { createError, getQuery, sendRedirect } from 'h3'
+import {
+  createGoogleAuthorizationUrl,
+  createGoogleOAuthState,
+  normalizeGoogleOAuthRedirect
+} from '../../../utils/google-oauth'
+import { requireMemberSession } from '../../../utils/member-auth'
+
+/**
+ * Google OAuth 시작 API
+ * @param {import('h3').H3Event} event - 요청 이벤트
+ * @returns {Promise<void>} Google 인증 화면 리다이렉트
+ */
+export default defineEventHandler(async (event) => {
+  const query = getQuery(event)
+  const mode = String(query.mode || 'member')
+
+  if (!['member', 'admin', 'link'].includes(mode)) {
+    throw createError({
+      statusCode: 400,
+      message: 'Google 로그인 모드가 올바르지 않습니다.'
+    })
+  }
+
+  const redirectTo = normalizeGoogleOAuthRedirect(
+    query.redirect,
+    mode === 'admin' ? '/admin' : mode === 'link' ? '/settings' : '/'
+  )
+  let userId = ''
+
+  if (mode === 'link') {
+    const session = await requireMemberSession(event)
+    userId = session.userId
+  }
+
+  const state = createGoogleOAuthState(event, {
+    mode,
+    redirectTo,
+    userId
+  })
+
+  return sendRedirect(event, createGoogleAuthorizationUrl(event, state), 302)
+})