refactor(auth): migrate social login to next-auth

package.json

@@ -15,13 +15,12 @@
   },
   "dependencies": {
     "@fingerprintjs/fingerprintjs": "^5.2.0",
-    "@greatsumini/react-facebook-login": "^3.4.0",
-    "@react-oauth/google": "^0.13.5",
     "@xstate/react": "^5",
     "classnames": "^2.5.1",
     "dexie": "^4.4.3",
     "lottie-react": "^2.4.1",
     "next": "16.2.7",
+    "next-auth": "^4.24.14",
     "ofetch": "^1.5.1",
     "react": "19.2.4",
     "react-dom": "19.2.4",

pnpm-lock.yaml

@@ -11,12 +11,6 @@ importers:
       '@fingerprintjs/fingerprintjs':
         specifier: ^5.2.0
         version: 5.2.0
-      '@greatsumini/react-facebook-login':
-        specifier: ^3.4.0
-        version: 3.4.0(react@19.2.4)
-      '@react-oauth/google':
-        specifier: ^0.13.5
-        version: 0.13.5(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
       '@xstate/react':
         specifier: ^5
         version: 5.0.5(@types/react@19.2.16)(react@19.2.4)(xstate@5.32.0)
@@ -32,6 +26,9 @@ importers:
       next:
         specifier: 16.2.7
         version: 16.2.7(@babel/core@7.29.7)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      next-auth:
+        specifier: ^4.24.14
+        version: 4.24.14(next@16.2.7(@babel/core@7.29.7)(react-dom@19.2.4(react@19.2.4))(react@19.2.4))(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
       ofetch:
         specifier: ^1.5.1
         version: 1.5.1
@@ -167,6 +164,10 @@ packages:
     engines: {node: '>=6.0.0'}
     hasBin: true
 
+  '@babel/runtime@7.29.7':
+    resolution: {integrity: sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw==}
+    engines: {node: '>=6.9.0'}
+
   '@babel/template@7.29.7':
     resolution: {integrity: sha512-puq+Gf35oI24FeN11LkoUQFqv9uwNeWpxXZi/Ji3rRIoKAzKnxRaZ+Gkj0vKS9ZCiTESfng1N9LyOyXvo+m+Gg==}
     engines: {node: '>=6.9.0'}
@@ -282,11 +283,6 @@ packages:
   '@fingerprintjs/fingerprintjs@5.2.0':
     resolution: {integrity: sha512-j+2nInkwCQNTJcNhOjvkGM/nLRTuGJTC6xai4quqvUpjob2ssrGwBZjS7k55nOmKvge7qvJT2nS3i/IRvQSTQA==}
 
-  '@greatsumini/react-facebook-login@3.4.0':
-    resolution: {integrity: sha512-NJYqTOcDghZ6zLppC+LJVLep7Xi3gfx9ssQFRd7EhDTU07lC15SG/eZ3ZyvUPsuPBkbhVl6E/Py0w4M5m7Lh9Q==}
-    peerDependencies:
-      react: ^16.0.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^20.0.0 || ^21.0.0
-
   '@humanfs/core@0.19.2':
     resolution: {integrity: sha512-UhXNm+CFMWcbChXywFwkmhqjs3PRCmcSa/hfBgLIb7oQ5HNb1wS0icWsGtSAUNgefHeI+eBrA8I1fxmbHsGdvA==}
     engines: {node: '>=18.18.0'}
@@ -559,15 +555,12 @@ packages:
   '@oxc-project/types@0.133.0':
     resolution: {integrity: sha512-KzkdCd6Uxqnf6l3HOw1xfatAlUURA0g14cvBYFyJ5SaNOQbOUvBr9PKArcPcrNIeRsBdgcUzOGrhKveVpvOIGA==}
 
+  '@panva/hkdf@1.2.1':
+    resolution: {integrity: sha512-6oclG6Y3PiDFcoyk8srjLfVKyMfVCKJ27JwNPViuXziFpmdz+MZnZN/aKY0JGXgYuO/VghU0jcOAZgWXZ1Dmrw==}
+
   '@polka/url@1.0.0-next.29':
     resolution: {integrity: sha512-wwQAWhWSuHaag8c4q/KN/vCoeOJYshAIvMQwD4GpSb3OiZklFfvAgmj0VCBBImRpuF/aFgIRzllXlVX93Jevww==}
 
-  '@react-oauth/google@0.13.5':
-    resolution: {integrity: sha512-xQWri2s/3nNekZJ4uuov2aAfQYu83bN3864KcFqw2pK1nNbFurQIjPFDXhWaKH3IjYJ2r/9yyIIpsn5lMqrheQ==}
-    peerDependencies:
-      react: '>=16.8.0'
-      react-dom: '>=16.8.0'
-
   '@rolldown/binding-android-arm64@1.0.3':
     resolution: {integrity: sha512-454rs7jHngixp/NMxd5srYD57OnzSlZ/eFTETjORQHLwJG1lRtmNOJcBerZlfu4GjKqeq8aCCIQrMdHyhI51Hw==}
     engines: {node: ^20.19.0 || >=22.12.0}
@@ -1230,6 +1223,10 @@ packages:
   cookie-es@1.2.3:
     resolution: {integrity: sha512-lXVyvUvrNXblMqzIRrxHb57UUVmqsSWlxqt3XIjCkUP0wDAf6uicO6KMbEgYrMNtEvWgWHwe42CKxPu9MYAnWw==}
 
+  cookie@0.7.2:
+    resolution: {integrity: sha512-yki5XnKuf750l50uGTllt6kKILY4nQ1eNIQatoXEByZ5dWgnKqbnqmTrBE5B4N7lrMJKQ2ytWMiTO2o0v6Ew/w==}
+    engines: {node: '>= 0.6'}
+
   cross-spawn@7.0.6:
     resolution: {integrity: sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==}
     engines: {node: '>= 8'}
@@ -1846,6 +1843,9 @@ packages:
     resolution: {integrity: sha512-AC/7JofJvZGrrneWNaEnJeOLUx+JlGt7tNa0wZiRPT4MY1wmfKjt2+6O2p2uz2+skll8OZZmJMNqeke7kKbNgQ==}
     hasBin: true
 
+  jose@4.15.9:
+    resolution: {integrity: sha512-1vUQX+IdDMVPj4k8kOxgUqlcK518yluMuGZwqlr44FS1ppZB/5GWh4rZG89erpOBOJjU/OBsnCVFfapsRz6nEA==}
+
   js-tokens@10.0.0:
     resolution: {integrity: sha512-lM/UBzQmfJRo9ABXbPWemivdCW8V2G8FHaHdypQaIy523snUjog0W71ayWXTjiR+ixeMyVHN2XcpnTd/liPg/Q==}
 
@@ -2018,6 +2018,10 @@ packages:
   lru-cache@5.1.1:
     resolution: {integrity: sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==}
 
+  lru-cache@6.0.0:
+    resolution: {integrity: sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==}
+    engines: {node: '>=10'}
+
   magic-string@0.30.21:
     resolution: {integrity: sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==}
 
@@ -2073,6 +2077,20 @@ packages:
   natural-compare@1.4.0:
     resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
 
+  next-auth@4.24.14:
+    resolution: {integrity: sha512-YRz6xFDXKUwiXSMMChbrBEWyFktZ1qZXEgeSHQQ3nsy08B4c/xLk6REeutRsIFwkjY/1+ShHnu07DN3JeJguig==}
+    peerDependencies:
+      '@auth/core': 0.34.3
+      next: ^12.2.5 || ^13 || ^14 || ^15 || ^16
+      nodemailer: ^7.0.7
+      react: ^17.0.2 || ^18 || ^19
+      react-dom: ^17.0.2 || ^18 || ^19
+    peerDependenciesMeta:
+      '@auth/core':
+        optional: true
+      nodemailer:
+        optional: true
+
   next@16.2.7:
     resolution: {integrity: sha512-eMJxgjRzBaj3olkP4cBamHDXL79A8FC6u1GcsO1D1Tsx8bw/LLXUJCaoajVxtnhD3A1IJqIT8IcRJjgBIPJq4w==}
     engines: {node: '>=20.9.0'}
@@ -2112,10 +2130,17 @@ packages:
     resolution: {integrity: sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==}
     engines: {node: '>=0.10.0'}
 
+  oauth@0.9.15:
+    resolution: {integrity: sha512-a5ERWK1kh38ExDEfoO6qUHJb32rd7aYmPHuyCu3Fta/cnICvYmgd2uhuKXvPD+PXB+gCEYYEaQdIRAjCOwAKNA==}
+
   object-assign@4.1.1:
     resolution: {integrity: sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==}
     engines: {node: '>=0.10.0'}
 
+  object-hash@2.2.0:
+    resolution: {integrity: sha512-gScRMn0bS5fH+IuwyIFgnh9zBdo4DV+6GhygmWM9HyNJSgS0hScp1f5vjtm7oIIOiT9trXrShAkLFSc2IqKNgw==}
+    engines: {node: '>= 6'}
+
   object-inspect@1.13.4:
     resolution: {integrity: sha512-W67iLl4J2EXEGTbfeHCffrjDfitvLANg0UlX3wFUUSTx92KXRFegMHUVgSqE+wvhAbi4WqjGg9czysTV2Epbew==}
     engines: {node: '>= 0.4'}
@@ -2151,6 +2176,13 @@ packages:
   ofetch@1.5.1:
     resolution: {integrity: sha512-2W4oUZlVaqAPAil6FUg/difl6YhqhUR7x2eZY4bQCko22UXg3hptq9KLQdqFClV+Wu85UX7hNtdGTngi/1BxcA==}
 
+  oidc-token-hash@5.2.0:
+    resolution: {integrity: sha512-6gj2m8cJZ+iSW8bm0FXdGF0YhIQbKrfP4yWTNzxc31U6MOjfEmB1rHvlYvxI1B7t7BCi1F2vYTT6YhtQRG4hxw==}
+    engines: {node: ^10.13.0 || >=12.0.0}
+
+  openid-client@5.7.1:
+    resolution: {integrity: sha512-jDBPgSVfTnkIh71Hg9pRvtJc6wTwqjRkN88+gCFtYWrlP4Yx2Dsrow8uPi3qLr/aeymPF3o2+dS+wOpglK04ew==}
+
   optionator@0.9.4:
     resolution: {integrity: sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==}
     engines: {node: '>= 0.8.0'}
@@ -2239,10 +2271,21 @@ packages:
     resolution: {integrity: sha512-FfR8sjd4em2T6fb3I2MwAJU7HWVMr9zba+enmQeeWFfCbm+UOC/0X4DS8XtpUTMwWMGbjKYP7xjfNekzyGmB3A==}
     engines: {node: ^10 || ^12 || >=14}
 
+  preact-render-to-string@5.2.6:
+    resolution: {integrity: sha512-JyhErpYOvBV1hEPwIxc/fHWXPfnEGdRKxc8gFdAZ7XV4tlzyzG847XAyEZqoDnynP88akM4eaHcSOzNcLWFguw==}
+    peerDependencies:
+      preact: '>=10'
+
+  preact@10.29.2:
+    resolution: {integrity: sha512-7tNmwg/7mzzAoB/8kSg6Hl37JraAZw3Z3A0JSY7VXlZwo82Xn0G7wKbNNs2qoF4ZEEsQGTwDAroNdqKs1ofJxQ==}
+
   prelude-ls@1.2.1:
     resolution: {integrity: sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==}
     engines: {node: '>= 0.8.0'}
 
+  pretty-format@3.8.0:
+    resolution: {integrity: sha512-WuxUnVtlWL1OfZFQFuqvnvs6MiAGk9UNsBostyBOB0Is9wb5uRESevA6rnl/rkksXaGX3GzZhPup5d6Vp1nFew==}
+
   prop-types@15.8.1:
     resolution: {integrity: sha512-oj87CgZICdulUohogVAR7AjlC0327U4el4L6eAvOqCeudMDVU0NThNaV+b9Df4dXgSP1gXMTnPdhfe/2qDH5cg==}
 
@@ -2669,6 +2712,11 @@ packages:
     peerDependencies:
       react: ^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0
 
+  uuid@8.3.2:
+    resolution: {integrity: sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==}
+    deprecated: uuid@10 and below is no longer supported.  For ESM codebases, update to uuid@latest.  For CommonJS codebases, use uuid@11 (but be aware this version will likely be deprecated in 2028).
+    hasBin: true
+
   vite@8.0.16:
     resolution: {integrity: sha512-h9bXPmJichP5fLmVQo3PyaGSDE2n3aPuomeAlVRm0JLmt4rY6zmPKd59HYI4LNW8oTK7tlTsuC7l/m7awx9Jcw==}
     engines: {node: ^20.19.0 || >=22.12.0}
@@ -2820,6 +2868,9 @@ packages:
   yallist@3.1.1:
     resolution: {integrity: sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==}
 
+  yallist@4.0.0:
+    resolution: {integrity: sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==}
+
   yargs-parser@21.1.1:
     resolution: {integrity: sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==}
     engines: {node: '>=12'}
@@ -2942,6 +2993,8 @@ snapshots:
     dependencies:
       '@babel/types': 7.29.7
 
+  '@babel/runtime@7.29.7': {}
+
   '@babel/template@7.29.7':
     dependencies:
       '@babel/code-frame': 7.29.7
@@ -3061,10 +3114,6 @@ snapshots:
 
   '@fingerprintjs/fingerprintjs@5.2.0': {}
 
-  '@greatsumini/react-facebook-login@3.4.0(react@19.2.4)':
-    dependencies:
-      react: 19.2.4
-
   '@humanfs/core@0.19.2':
     dependencies:
       '@humanfs/types': 0.15.0
@@ -3250,12 +3299,9 @@ snapshots:
 
   '@oxc-project/types@0.133.0': {}
 
-  '@polka/url@1.0.0-next.29': {}
+  '@panva/hkdf@1.2.1': {}
 
-  '@react-oauth/google@0.13.5(react-dom@19.2.4(react@19.2.4))(react@19.2.4)':
+  '@polka/url@1.0.0-next.29': {}
-    dependencies:
-      react: 19.2.4
-      react-dom: 19.2.4(react@19.2.4)
 
   '@rolldown/binding-android-arm64@1.0.3':
     optional: true
@@ -3880,6 +3926,8 @@ snapshots:
 
   cookie-es@1.2.3: {}
 
+  cookie@0.7.2: {}
+
   cross-spawn@7.0.6:
     dependencies:
       path-key: 3.1.1
@@ -4645,6 +4693,8 @@ snapshots:
 
   jiti@2.7.0: {}
 
+  jose@4.15.9: {}
+
   js-tokens@10.0.0: {}
 
   js-tokens@4.0.0: {}
@@ -4802,6 +4852,10 @@ snapshots:
     dependencies:
       yallist: 3.1.1
 
+  lru-cache@6.0.0:
+    dependencies:
+      yallist: 4.0.0
+
   magic-string@0.30.21:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.5
@@ -4847,6 +4901,21 @@ snapshots:
 
   natural-compare@1.4.0: {}
 
+  next-auth@4.24.14(next@16.2.7(@babel/core@7.29.7)(react-dom@19.2.4(react@19.2.4))(react@19.2.4))(react-dom@19.2.4(react@19.2.4))(react@19.2.4):
+    dependencies:
+      '@babel/runtime': 7.29.7
+      '@panva/hkdf': 1.2.1
+      cookie: 0.7.2
+      jose: 4.15.9
+      next: 16.2.7(@babel/core@7.29.7)(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      oauth: 0.9.15
+      openid-client: 5.7.1
+      preact: 10.29.2
+      preact-render-to-string: 5.2.6(preact@10.29.2)
+      react: 19.2.4
+      react-dom: 19.2.4(react@19.2.4)
+      uuid: 8.3.2
+
   next@16.2.7(@babel/core@7.29.7)(react-dom@19.2.4(react@19.2.4))(react@19.2.4):
     dependencies:
       '@next/env': 16.2.7
@@ -4886,8 +4955,12 @@ snapshots:
 
   normalize-path@3.0.0: {}
 
+  oauth@0.9.15: {}
+
   object-assign@4.1.1: {}
 
+  object-hash@2.2.0: {}
+
   object-inspect@1.13.4: {}
 
   object-keys@1.1.1: {}
@@ -4936,6 +5009,15 @@ snapshots:
       node-fetch-native: 1.6.7
       ufo: 1.6.4
 
+  oidc-token-hash@5.2.0: {}
+
+  openid-client@5.7.1:
+    dependencies:
+      jose: 4.15.9
+      lru-cache: 6.0.0
+      object-hash: 2.2.0
+      oidc-token-hash: 5.2.0
+
   optionator@0.9.4:
     dependencies:
       deep-is: 0.1.4
@@ -5019,8 +5101,17 @@ snapshots:
       picocolors: 1.1.1
       source-map-js: 1.2.1
 
+  preact-render-to-string@5.2.6(preact@10.29.2):
+    dependencies:
+      preact: 10.29.2
+      pretty-format: 3.8.0
+
+  preact@10.29.2: {}
+
   prelude-ls@1.2.1: {}
 
+  pretty-format@3.8.0: {}
+
   prop-types@15.8.1:
     dependencies:
       loose-envify: 1.4.0
@@ -5506,6 +5597,8 @@ snapshots:
     dependencies:
       react: 19.2.4
 
+  uuid@8.3.2: {}
+
   vite@8.0.16(@types/node@20.19.41)(jiti@2.7.0):
     dependencies:
       lightningcss: 1.32.0
@@ -5632,6 +5725,8 @@ snapshots:
 
   yallist@3.1.1: {}
 
+  yallist@4.0.0: {}
+
   yargs-parser@21.1.1: {}
 
   yargs@17.7.2:

src/app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,19 @@
+/**
+ * NextAuth App Router 入口
+ *
+ * 路径：/api/auth/[...nextauth]
+ * 自动处理 NextAuth 所有内置路由：
+ *   /api/auth/signin/[provider]
+ *   /api/auth/callback/[provider]
+ *   /api/auth/signout
+ *   /api/auth/session
+ *   /api/auth/csrf
+ *   /api/auth/providers
+ */
+import NextAuth from "next-auth";
+
+import { authOptions } from "@/lib/auth/config";
+
+const handler = NextAuth(authOptions);
+
+export { handler as GET, handler as POST };

src/app/auth/components/auth-facebook-panel.tsx

@@ -6,54 +6,54 @@
  *
  * 行为：
  *  - 默认显示「Continue with Facebook」+ 「Other sign-in options」入口
- *  - 真实 Facebook 登录在「Continue with Facebook」按钮中触发
+ *  - 社交登录直接调 `nextauth.facebookLogin()` / `nextauth.googleLogin()`（NextAuth 流程）
  */
 import { useState } from "react";
 
-import { useAuthState, useAuthDispatch } from "@/stores/auth/auth-context";
+import { useAuthState } from "@/stores/auth/auth-context";
+import { facebookLogin, googleLogin } from "@/lib/auth/nextauth";
 
 import { AuthSocialButtons } from "./auth-social-buttons";
 import { AuthDivider } from "./auth-divider";
 import { AuthPrimaryButton } from "./auth-primary-button";
 import { AuthErrorMessage } from "./auth-error-message";
 import { AuthOtherOptionsDialog } from "./auth-other-options-dialog";
-import { GoogleSignInButton } from "./google-sign-in-button";
 import { AuthLegalText } from "./auth-legal-text";
 import styles from "./auth-facebook-panel.module.css";
 
 export interface AuthFacebookPanelProps {
   onSwitchToEmail: () => void;
-  onGoogleSuccess: (idToken: string, email: string) => void;
 }
 
-export function AuthFacebookPanel({
+export function AuthFacebookPanel({ onSwitchToEmail }: AuthFacebookPanelProps) {
-  onSwitchToEmail,
-  onGoogleSuccess,
-}: AuthFacebookPanelProps) {
   const state = useAuthState();
-  const dispatch = useAuthDispatch();
   const [showOptions, setShowOptions] = useState(false);
+  const [busy, setBusy] = useState<null | "facebook" | "google">(null);
+
+  const handleFacebook = async () => {
+    setBusy("facebook");
+    const r = await facebookLogin();
+    setBusy(null);
+    if (!r.success) console.error("[auth-facebook-panel]", r.error);
+  };
+
+  const handleGoogle = async () => {
+    setBusy("google");
+    const r = await googleLogin();
+    setBusy(null);
+    if (!r.success) console.error("[auth-facebook-panel]", r.error);
+  };
 
   return (
     <div className={styles.panel}>
       <AuthErrorMessage message={state.errorMessage} />
       <AuthSocialButtons
-        loadingProvider={state.isLoading ? "facebook" : null}
+        loadingProvider={busy ?? (state.isLoading ? "facebook" : null)}
-        onFacebook={() => dispatch({ type: "AuthFacebookLoginSubmitted" })}
+        onFacebook={handleFacebook}
-        onGoogle={() => dispatch({ type: "AuthGoogleLoginSubmitted" })}
+        onGoogle={handleGoogle}
-        googleSlot={
-          <GoogleSignInButton
-            onSuccess={(s) =>
-              onGoogleSuccess(s.idToken, s.email)
-            }
-          />
-        }
       />
       <AuthDivider label="or" />
-      <AuthPrimaryButton
+      <AuthPrimaryButton onClick={onSwitchToEmail} variant="primary">
-        onClick={onSwitchToEmail}
-        variant="primary"
-      >
         Continue with Email
       </AuthPrimaryButton>
       <button
@@ -69,21 +69,21 @@ export function AuthFacebookPanel({
         onClose={() => setShowOptions(false)}
         onFacebook={() => {
           setShowOptions(false);
-          dispatch({ type: "AuthFacebookLoginSubmitted" });
+          void handleFacebook();
         }}
         onGoogle={() => {
           setShowOptions(false);
-          dispatch({ type: "AuthGoogleLoginSubmitted" });
+          void handleGoogle();
         }}
         onApple={() => {
           setShowOptions(false);
-          dispatch({ type: "AuthAppleLoginSubmitted" });
+          console.warn("Apple login not implemented");
         }}
         onEmail={() => {
           setShowOptions(false);
           onSwitchToEmail();
         }}
-        loadingProvider={state.isLoading ? "facebook" : null}
+        loadingProvider={busy ?? (state.isLoading ? "facebook" : null)}
         showApple={false}
       />
     </div>

src/app/auth/components/auth-panel.tsx

@@ -10,11 +10,7 @@ import { AuthFacebookPanel } from "./auth-facebook-panel";
 import { AuthEmailPanel } from "./auth-email-panel";
 import styles from "./auth-panel.module.css";
 
-export interface AuthPanelProps {
+export function AuthPanel() {
-  onGoogleSuccess: (idToken: string, email: string) => void;
-}
-
-export function AuthPanel({ onGoogleSuccess }: AuthPanelProps) {
   const state = useAuthState();
   return (
     <div className={styles.panel}>
@@ -26,7 +22,6 @@ export function AuthPanel({ onGoogleSuccess }: AuthPanelProps) {
             // 但我们目前 AuthFacebookPanel 内部 click "Continue with Email" 直接调用 onSwitchToEmail
             // 实际上本组件直接渲染对应 panel
           }}
-          onGoogleSuccess={onGoogleSuccess}
         />
       ) : (
         <AuthEmailPanel onBack={() => undefined} />

src/app/auth/components/auth-screen.tsx

@@ -16,7 +16,7 @@ import { useRouter } from "next/navigation";
 import { useAuthState, useAuthDispatch } from "@/stores/auth/auth-context";
 import { useChatDispatch } from "@/stores/chat/chat-context";
 import { useUserDispatch } from "@/stores/user/user-context";
-import { useAuthGate } from "@/lib/auth/use-auth-gate";
+import { useAuthGate } from "@/lib/auth/nextauth";
 import { ROUTES } from "@/lib/routes";
 import { MobileShell } from "@/app/_components/core/mobile-shell";
 import { AuthPanel } from "@/app/auth/components/auth-panel";
@@ -42,7 +42,7 @@ export function AuthScreen({
     if (isAuthed) router.replace(ROUTES.chat);
   }, [isAuthed, router]);
 
-  // 登录成功 → 通知 Chat + User + 跳转
+  // 邮箱登录成功 → 通知 Chat + User + 跳转
   useEffect(() => {
     if (state.isSuccess && !wasSuccess.current) {
       wasSuccess.current = true;
@@ -63,11 +63,7 @@ export function AuthScreen({
           padding: "var(--spacing-lg)",
         }}
       >
-        <AuthPanel
+        <AuthPanel />
-          onGoogleSuccess={(idToken, email) => {
-            authDispatch({ type: "AuthWebGoogleLoginSuccess", idToken, email });
-          }}
-        />
       </div>
     </MobileShell>
   );

src/app/auth/components/google-sign-in-button.tsx

@@ -1,50 +0,0 @@
-"use client";
-/**
- * Google 登录按钮（GIS 渲染）
- *
- * 原始 Dart: lib/ui/auth/widgets/google_sign_in_web.dart
- *
- * 通过 `google.accounts.id.renderButton` 把 GIS 官方按钮渲染到指定 div。
- * 登录成功由 `setOnGoogleSignInSuccess` 设置的回调处理。
- */
-import { useEffect, useRef } from "react";
-
-import {
-  renderGoogleButton,
-  setOnGoogleSignInSuccess,
-  type GoogleSignInSuccess,
-} from "@/integrations/google-identity";
-import styles from "./google-sign-in-button.module.css";
-
-export interface GoogleSignInButtonProps {
-  onSuccess: (success: GoogleSignInSuccess) => void;
-}
-
-export function GoogleSignInButton({ onSuccess }: GoogleSignInButtonProps) {
-  const ref = useRef<HTMLDivElement | null>(null);
-
-  useEffect(() => {
-    setOnGoogleSignInSuccess(onSuccess);
-    return () => setOnGoogleSignInSuccess(null);
-  }, [onSuccess]);
-
-  useEffect(() => {
-    if (!ref.current) return;
-    let cancelled = false;
-    // GIS 异步加载，轮询直到可用
-    const tryRender = () => {
-      if (cancelled) return;
-      if (window.google?.accounts?.id) {
-        renderGoogleButton(ref.current!, { theme: "outline", size: "large" });
-      } else {
-        setTimeout(tryRender, 100);
-      }
-    };
-    tryRender();
-    return () => {
-      cancelled = true;
-    };
-  }, []);
-
-  return <div ref={ref} className={styles.slot} />;
-}

src/app/auth/components/index.ts

@@ -17,5 +17,4 @@ export * from "./auth-text-field";
 export * from "./auth-validators";
 export * from "./email-login-form";
 export * from "./email-register-form";
-export * from "./google-sign-in-button";
 export * from "./__tests__/auth-validators.test";

src/app/layout.tsx

@@ -1,7 +1,7 @@
 import type { Metadata } from "next";
 import { Geist, Geist_Mono } from "next/font/google";
 import localFont from "next/font/local";
-import Script from "next/script";
+import { SessionProvider } from "next-auth/react";
 import "./globals.css";
 
 import { RootProviders } from "@/providers/root-providers";
@@ -61,24 +61,17 @@ export default function RootLayout({
 }>) {
   return (
     // suppressHydrationWarning：next/font + Tailwind v4 偶发类名差异；详见
-    // `src/lib/auth/use-auth-gate.tsx` 的"水合闪屏"说明。
+    // `src/lib/auth/nextauth.ts` 的"水合闪屏"说明。
     <html
       lang="en"
       suppressHydrationWarning
       className={`${geistSans.variable} ${geistMono.variable} ${athelas.variable} h-full antialiased`}
     >
       <body className="min-h-full flex flex-col">
-        {/* Facebook SDK JS（auth + splash 入口会用到 FB.login） */}
+        {/* NextAuth SessionProvider：为所有客户端组件提供 useSession() 上下文 */}
-        <Script
+        <SessionProvider>
-          src="https://connect.facebook.net/en_US/sdk.js"
+          <RootProviders>{children}</RootProviders>
-          strategy="afterInteractive"
+        </SessionProvider>
-        />
-        {/* Google Identity Services（auth 入口会用到 google.accounts.id） */}
-        <Script
-          src="https://accounts.google.com/gsi/client"
-          strategy="afterInteractive"
-        />
-        <RootProviders>{children}</RootProviders>
       </body>
     </html>
   );

src/app/splash/components/splash-button.tsx

@@ -6,16 +6,12 @@
  *   `Row(children: [Skip 文本, SizedBox 26, Facebook 登录按钮])`
  *
  * 本组件是 splash 鉴权流程的**自治单元**：
- *   - 直接消费 `useAuthGate` / `useAuthState` / `useAuthDispatch`
+ *   - 消费 `useAuthGate`（内部用 useSession 监听 NextAuth session）
- *   - 直接消费 `useChatDispatch` / `useUserDispatch`（登录成功后初始化）
+ *   - 消费 `useAuthState` / `useAuthDispatch`（邮箱登录流程）
+ *   - 消费 `useChatDispatch` / `useUserDispatch`（登录成功后初始化）
  *   - 自管路由跳转（已登录 / 登录成功 → /chat）
  *   - Skip 用 `<Link>` 保留 SPA 体验
- *
+ *   - 社交登录按钮直接调 `nextauth.facebookLogin()`（NextAuth 流程）
- * 设计要点：
- *   - 仅两个元素：Skip 文本 + Facebook 登录按钮
- *   - 居中布局 (MainAxisAlignment.center)
- *   - Facebook 按钮：带渐变（primaryGradient）+ 圆角 24 + 高度 48
- *   - 加载中：按钮内显示 spinner
  */
 import Link from "next/link";
 import { useRouter } from "next/navigation";
@@ -24,7 +20,7 @@ import { useEffect, useRef } from "react";
 import { useAuthState, useAuthDispatch } from "@/stores/auth/auth-context";
 import { useChatDispatch } from "@/stores/chat/chat-context";
 import { useUserDispatch } from "@/stores/user/user-context";
-import { useAuthGate } from "@/lib/auth/use-auth-gate";
+import { facebookLogin, useAuthGate } from "@/lib/auth/nextauth";
 import { ROUTES } from "@/lib/routes";
 import { LoadingIndicator } from "@/app/_components/core/loading-indicator";
 import styles from "./splash-button.module.css";
@@ -52,7 +48,7 @@ export function SplashButton({ skipHref = ROUTES.chat }: SplashButtonProps) {
     if (isAuthed) router.replace(ROUTES.chat);
   }, [isAuthed, router]);
 
-  // 登录成功跳 /chat + 通知 chat/user 初始化
+  // 邮箱登录成功跳 /chat + 通知 chat/user 初始化
   useEffect(() => {
     if (state.isSuccess && !wasSuccess.current) {
       wasSuccess.current = true;
@@ -62,6 +58,13 @@ export function SplashButton({ skipHref = ROUTES.chat }: SplashButtonProps) {
     }
   }, [state.isSuccess, chatDispatch, userDispatch, router]);
 
+  const handleFacebookLogin = async () => {
+    const r = await facebookLogin();
+    if (!r.success) {
+      console.error("[splash-button] Facebook login failed", r.error);
+    }
+  };
+
   return (
     <div className={styles.wrapper}>
       {/* Skip 文本链接（next/link 渲染为 <a>，保留 SPA 体验） */}
@@ -77,12 +80,10 @@ export function SplashButton({ skipHref = ROUTES.chat }: SplashButtonProps) {
 
       <div className={styles.separator} aria-hidden="true" />
 
-      {/* Facebook 登录按钮（带渐变） */}
+      {/* 社交登录按钮（NextAuth Facebook OAuth） */}
       <button
         type="button"
-        onClick={() => {
+        onClick={handleFacebookLogin}
-          authDispatch({ type: "AuthFacebookLoginSubmitted" });
-        }}
         disabled={isLoading}
         className={styles.facebookButton}
       >

src/data/services/auth/auth_bridge_component.tsx

@@ -1,242 +0,0 @@
-"use client";
-
-/**
- * 第三方登录 Bridge 组件。
- *
- * 原始 Dart: lib/utils/google_auth_initializer.dart + lib/utils/facebook_auth_initializer.dart
- *
- * 设计：
- *   - 不渲染任何 UI（`children` 透传）。
- *   - 通过 `@react-oauth/google` 的 `GoogleOAuthProvider` 加载的 GIS 脚本，
- *     调用 `window.google.accounts.id.initialize` + `prompt` 实现 Google 登录弹窗；
- *     callback 收到 id_token 后解析 JWT payload 拿到 email/displayName/photoUrl。
- *   - 通过 `@greatsumini/react-facebook-login` 的 `FacebookLoginClient.init` +
- *     `FacebookLoginClient.login` 实现 Facebook 登录弹窗。
- *   - 监听 `auth_event_bridge` 派发的 `cozsweet:auth:*:start` 事件，触发对应
- *     SDK 流程；拿到凭证后回调 `platform.resolveGoogle()` / `platform.resolveFacebook()`。
- *   - 单 popup 语义：v1 一次只追踪一个待处理 Google / Facebook 请求，多个并发
- *     调用会被覆盖。后续如需并发支持，需把 ref 改为 `Map<requestId, resolver>`。
- *
- * 部署：本步骤**不**挂载到 `src/app/layout.tsx`。下一轮 UI 接入时按如下方式挂载：
- *
- *   import { GoogleOAuthProvider } from "@react-oauth/google";
- *   import { AuthPlatformBridge } from "@/data/services/auth";
- *
- *   <GoogleOAuthProvider clientId={process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID!}>
- *     <AuthPlatformBridge platform={getAuthPlatform({...})}>
- *       {children}
- *     </AuthPlatformBridge>
- *   </GoogleOAuthProvider>
- */
-import { useEffect, useRef } from "react";
-import { useGoogleOAuth } from "@react-oauth/google";
-import { FacebookLoginClient, LoginStatus } from "@greatsumini/react-facebook-login";
-import { Result, toError, type Result as ResultT } from "@/utils/result";
-import type {
-  IAuthPlatform,
-  IAuthPlatformOptions,
-  GoogleCredential,
-  FacebookLoginResult,
-} from "./auth_platform";
-import { AUTH_EVENTS, onAuthEvent } from "./auth_event_bridge";
-
-/**
- * Bridge 要求 platform 是带 `opts` + `resolveGoogle` + `resolveFacebook` 的
- * WebAuthPlatform。结构化类型便于 mock / 子类扩展。
- */
-export interface AuthPlatformBridgeProps {
-  platform: IAuthPlatform & {
-    readonly opts: IAuthPlatformOptions;
-    resolveGoogle(
-      requestId: string,
-      result: ResultT<GoogleCredential>,
-    ): void;
-    resolveFacebook(
-      requestId: string,
-      result: ResultT<FacebookLoginResult>,
-    ): void;
-  };
-  children?: React.ReactNode;
-}
-
-export function AuthPlatformBridge({
-  platform,
-  children,
-}: AuthPlatformBridgeProps) {
-  const platformRef = useRef(platform);
-  // 在 effect 中更新 ref（react-hooks/refs 规则禁止 render 期更新 ref.current）。
-  // 这样后续 effect / callback 闭包总能拿到最新的 platform 引用。
-  useEffect(() => {
-    platformRef.current = platform;
-  });
-
-  // ======== Google GIS ========
-
-  const { scriptLoadedSuccessfully } = useGoogleOAuth();
-  const pendingGoogleRef = useRef<{ requestId: string } | null>(null);
-
-  // 初始化 GIS callback（一次性；GIS 全局只允许一个 id initialize 回调）
-  useEffect(() => {
-    if (!scriptLoadedSuccessfully) return;
-    if (typeof window === "undefined") return;
-    const gis = window.google?.accounts?.id;
-    if (!gis) return;
-
-    gis.initialize({
-      client_id: platformRef.current.opts.googleClientId,
-      callback: (response) => {
-        const pending = pendingGoogleRef.current;
-        pendingGoogleRef.current = null;
-        if (!pending) return;
-        if (response.credential) {
-          const decoded = decodeJwtPayload(response.credential);
-          platformRef.current.resolveGoogle(
-            pending.requestId,
-            Result.ok<GoogleCredential>({
-              idToken: response.credential,
-              email: decoded?.email ?? null,
-              displayName: decoded?.name ?? null,
-              photoUrl: decoded?.picture ?? null,
-            }),
-          );
-          // 全局成功回调
-          platformRef.current.opts.onGoogleSignInSuccess?.(
-            response.credential,
-            decoded?.email ?? null,
-          );
-        } else {
-          platformRef.current.resolveGoogle(
-            pending.requestId,
-            Result.err<GoogleCredential>(
-              new Error("Google sign-in failed: no credential"),
-            ),
-          );
-        }
-      },
-    });
-  }, [scriptLoadedSuccessfully]);
-
-  // 监听 googleStart 事件 → 触发 prompt
-  useEffect(() => {
-    return onAuthEvent(AUTH_EVENTS.googleStart, (detail) => {
-      pendingGoogleRef.current = { requestId: detail.requestId };
-      const gis =
-        typeof window !== "undefined" ? window.google?.accounts?.id : undefined;
-      if (gis) {
-        gis.prompt();
-      } else {
-        // GIS 未加载完成：立即 reject
-        pendingGoogleRef.current = null;
-        platformRef.current.resolveGoogle(
-          detail.requestId,
-          Result.err<GoogleCredential>(
-            new Error("Google Identity Services script not loaded"),
-          ),
-        );
-      }
-    });
-  }, []);
-
-  // ======== Facebook SDK ========
-
-  const pendingFacebookRef = useRef<{ requestId: string } | null>(null);
-
-  // 初始化 Facebook SDK（一次性）
-  useEffect(() => {
-    if (typeof window === "undefined") return;
-    try {
-      // 版本联合类型截止 v21.0，但底层 FB JS SDK 支持 v25.0；用类型断言绕过。
-      FacebookLoginClient.init({
-        appId: platformRef.current.opts.facebookAppId,
-        version: (platformRef.current.opts.facebookApiVersion ??
-          "v25.0") as "v21.0",
-        cookie: true,
-        xfbml: true,
-      });
-    } catch (e) {
-      console.warn("[auth] FacebookLoginClient.init failed", e);
-    }
-  }, []);
-
-  // 监听 facebookStart 事件 → 触发 login
-  useEffect(() => {
-    return onAuthEvent(AUTH_EVENTS.facebookStart, (detail) => {
-      pendingFacebookRef.current = { requestId: detail.requestId };
-      try {
-        FacebookLoginClient.login(
-          (response) => {
-            const pending = pendingFacebookRef.current;
-            pendingFacebookRef.current = null;
-            if (!pending) return;
-            if (
-              response.status === LoginStatus.Connected &&
-              response.authResponse
-            ) {
-              const expiresIn = Number(response.authResponse.expiresIn);
-              const expiresAt = Number.isFinite(expiresIn)
-                ? Date.now() + expiresIn * 1000
-                : null;
-              platformRef.current.resolveFacebook(
-                pending.requestId,
-                Result.ok<FacebookLoginResult>({
-                  status: "success",
-                  accessToken: response.authResponse.accessToken,
-                  userId: response.authResponse.userID,
-                  expiresAt,
-                }),
-              );
-            } else {
-              // NotAuthorized / Unknown / loginCancelled / facebookNotLoaded
-              platformRef.current.resolveFacebook(
-                pending.requestId,
-                Result.ok<FacebookLoginResult>({
-                  status: "cancelled",
-                  accessToken: "",
-                  userId: "",
-                  expiresAt: null,
-                }),
-              );
-            }
-          },
-          { scope: "public_profile,email" },
-        );
-      } catch (e) {
-        const pending = pendingFacebookRef.current;
-        pendingFacebookRef.current = null;
-        if (pending) {
-          platformRef.current.resolveFacebook(
-            pending.requestId,
-            Result.err<FacebookLoginResult>(toError(e)),
-          );
-        }
-      }
-    });
-  }, []);
-
-  return <>{children}</>;
-}
-
-// ======== Helpers ========
-
-/**
- * 解码 JWT payload 段。不做签名校验——签名由后端校验。
- * 返回 null 表示解码失败。
- */
-function decodeJwtPayload(
-  idToken: string,
-): { email?: string; name?: string; picture?: string } | null {
-  try {
-    const parts = idToken.split(".");
-    if (parts.length !== 3) return null;
-    const payload = parts[1].replace(/-/g, "+").replace(/_/g, "/");
-    const padded = payload + "=".repeat((4 - (payload.length % 4)) % 4);
-    const decoded = atob(padded);
-    return JSON.parse(decoded) as {
-      email?: string;
-      name?: string;
-      picture?: string;
-    };
-  } catch {
-    return null;
-  }
-}

src/data/services/auth/auth_event_bridge.ts

@@ -1,47 +0,0 @@
-"use client";
-
-/**
- * 跨 plain-TS / React 边界的 DOM 事件通道。
- *
- * 用途：
- *   - `WebAuthPlatform`（plain TS class，挂在 `getAuthPlatform()` 单例上）dispatch
- *     `cozsweet:auth:*:start` 事件，并等待 `AuthPlatformBridge`（"use client" 组件）
- *     调回 `platform.resolveGoogle()` / `platform.resolveFacebook()` 完成 Promise。
- *   - 这样既满足"接口保持 plain TS、可以被非 React 上下文消费"的需求，又让
- *     `@react-oauth/google` 的 `GoogleOAuthProvider`（脚本加载）和
- *     `window.google.accounts.id.*` GIS API 都在 React 侧执行。
- *
- * 本文件不依赖 React，可以被 `WebAuthPlatform`（无 React 引用）安全 import。
- */
-export const AUTH_EVENTS = {
-  googleStart: "cozsweet:auth:google:start",
-  facebookStart: "cozsweet:auth:facebook:start",
-} as const;
-
-export type AuthEventName = (typeof AUTH_EVENTS)[keyof typeof AUTH_EVENTS];
-
-/** Payload attached to *:start events. */
-export interface AuthStartDetail {
-  readonly requestId: string;
-}
-
-export function dispatchAuthEvent(
-  name: AuthEventName,
-  detail: AuthStartDetail,
-): void {
-  if (typeof window === "undefined") return;
-  window.dispatchEvent(new CustomEvent<AuthStartDetail>(name, { detail }));
-}
-
-export function onAuthEvent(
-  name: AuthEventName,
-  handler: (detail: AuthStartDetail) => void,
-): () => void {
-  if (typeof window === "undefined") return () => {};
-  const listener = (e: Event) => {
-    const detail = (e as CustomEvent<AuthStartDetail>).detail;
-    handler(detail);
-  };
-  window.addEventListener(name, listener);
-  return () => window.removeEventListener(name, listener);
-}

src/data/services/auth/auth_platform.ts

@@ -1,91 +0,0 @@
-/**
- * 第三方登录平台抽象接口 + 工厂 + 单例
- *
- * 原始 Dart: lib/data/services/auth/auth_platform.dart
- *
- * 设计：
- *   - `IAuthPlatform` 是 plain TypeScript 接口（不依赖 React）。
- *   - 真机实现 `WebAuthPlatform` 通过 DOM 事件与 `AuthPlatformBridge`（"use client"
- *     组件）通信，由 Bridge 持有 React SDK 钩子。
- *   - Mock 实现 `MockAuthPlatform` 跳过 SDK，直接返回固定 token。
- *   - 工厂根据 `NEXT_PUBLIC_USE_MOCK_AUTH` 环境变量二选一（对齐 Dart `kDebugMode`）。
- *
- * 调用方契约：
- *   - 平台**只产 token**，不调 `authRepository` / `authApi`。
- *   - 拿到 `Result<GoogleCredential>` / `Result<FacebookLoginResult>` 后，
- *     由调用方自行 `authRepository.googleLogin({ idToken })` 完成登录。
- */
-import { Result, type Result as ResultT } from "@/utils/result";
-import type { FacebookUserData } from "@/data/dto/auth/facebook_user_data";
-import { WebAuthPlatform } from "./web_auth_platform";
-import { MockAuthPlatform } from "./mock_auth_platform";
-
-/** 归一化的 Google 凭证（id_token + 解析自 JWT payload 的展示字段）。 */
-export interface GoogleCredential {
-  readonly idToken: string;
-  readonly email: string | null;
-  readonly displayName: string | null;
-  readonly photoUrl: string | null;
-}
-
-/** 归一化的 Facebook 登录结果。 */
-export interface FacebookLoginResult {
-  readonly status: "success" | "cancelled" | "error";
-  readonly accessToken: string;
-  readonly userId: string;
-  /** epoch ms；null 表示后端未返回 expiresIn。 */
-  readonly expiresAt: number | null;
-}
-
-export interface IAuthPlatform {
-  /** Google 登录。Web 平台通过 GIS 弹窗流程。 */
-  googleSignIn(): Promise<ResultT<GoogleCredential>>;
-  /** 是否支持 Google "authenticate" 流程。Web 平台恒为 false。 */
-  supportsGoogleAuthenticate(): boolean;
-  /** Facebook 登录。 */
-  facebookSignIn(): Promise<ResultT<FacebookLoginResult>>;
-  /** 拉取 Facebook 用户数据（id / name / email / pictureUrl）。 */
-  getFacebookUserData(): Promise<ResultT<FacebookUserData>>;
-}
-
-export interface IAuthPlatformOptions {
-  readonly googleClientId: string;
-  readonly facebookAppId: string;
-  /** Facebook Graph API 版本，默认 "v25.0"（对齐 Flutter 端）。 */
-  readonly facebookApiVersion?: string;
-  /** 全局 Google 登录成功回调（对齐 Dart `onGoogleSignInSuccess`）。 */
-  readonly onGoogleSignInSuccess?: (
-    idToken: string,
-    email: string | null,
-  ) => void;
-}
-
-export class AuthPlatformFactory {
-  private constructor() {}
-
-  /**
-   * 根据 `NEXT_PUBLIC_USE_MOCK_AUTH` 二选一返回平台实现。
-   * 对齐 Dart `AuthPlatformFactory.create()` 的 `kDebugMode` 分支。
-   */
-  static create(opts: IAuthPlatformOptions): IAuthPlatform {
-    if (process.env.NEXT_PUBLIC_USE_MOCK_AUTH === "true") {
-      return new MockAuthPlatform();
-    }
-    return new WebAuthPlatform(opts);
-  }
-}
-
-/** 顶层单例（懒加载）。 */
-let _instance: IAuthPlatform | null = null;
-export function getAuthPlatform(opts: IAuthPlatformOptions): IAuthPlatform {
-  if (!_instance) _instance = AuthPlatformFactory.create(opts);
-  return _instance;
-}
-
-/** @internal 测试用：重置单例。 */
-export function _resetAuthPlatformForTests(): void {
-  _instance = null;
-}
-
-// re-export 让 barrelsby 抓得到
-export { Result };

src/data/services/auth/global.d.ts

@@ -1,50 +0,0 @@
-/**
- * 全局类型声明：Google Identity Services (`gis`) 添加的 `window.google` 全局对象。
- *
- * 由 `<GoogleOAuthProvider>` / `useGoogleOAuth()` 注入的 GIS 脚本会向 `window`
- * 挂载 `google.accounts.id` / `google.accounts.oauth2` 等命名空间。本文件让
- * TypeScript 知道这些属性的存在，避免在 Bridge 组件中用 `as unknown as ...`
- * 强转。
- *
- * 仅声明我们用到的子集；未列出的 GIS 属性走 `unknown`。
- */
-export {};
-
-declare global {
-  interface Window {
-    google?: {
-      accounts?: {
-        id?: {
-          initialize(config: {
-            client_id: string;
-            callback: (response: { credential?: string }) => void;
-            auto_select?: boolean;
-            cancel_on_tap_outside?: boolean;
-            itp_support?: boolean;
-            login_hint?: string;
-            hosted_domain?: string;
-            use_fedcm_for_prompt?: boolean;
-            nonce?: string;
-            state_cookie_domain?: string;
-            prompt_parent_id?: string;
-          }): void;
-          prompt(): void;
-          renderButton(
-            parent: HTMLElement,
-            options: {
-              type?: "standard" | "icon";
-              theme?: "outline" | "filled_blue" | "filled_black";
-              size?: "large" | "medium" | "small";
-              text?: "signin_with" | "signup_with" | "continue_with" | "signin";
-              shape?: "rectangular" | "pill" | "circle" | "square";
-              logo_alignment?: "left" | "center";
-              width?: string | number;
-            },
-          ): void;
-          cancel(): void;
-        };
-        oauth2?: unknown;
-      };
-    };
-  }
-}

src/data/services/auth/index.ts

@@ -1,12 +0,0 @@
-/**
- * @file Automatically generated by barrelsby.
- */
-
-export * from "./auth_bridge_component";
-export * from "./auth_event_bridge";
-export * from "./auth_platform";
-export * from "./global";
-export * from "./initialize_facebook_auth";
-export * from "./initialize_google_auth";
-export * from "./mock_auth_platform";
-export * from "./web_auth_platform";

src/data/services/auth/initialize_facebook_auth.ts

@@ -1,27 +0,0 @@
-"use client";
-
-/**
- * Facebook SDK 预热辅助。
- *
- * 原始 Dart: `lib/utils/facebook_auth_initializer.dart` 的 `initializeFacebookAuth()`
- *
- * 行为：
- *   - 对齐 Dart `FacebookAuth.i.webAndDesktopInitialize(appId, cookie: true,
- *     xfbml: true, version: 'v25.0')` 的参数语义。
- *   - 真实 SDK 初始化（注入 `<div id="facebook-jssdk">` + 调用 `FB.init`）由
- *     `@greatsumini/react-facebook-login` 的 `FacebookLoginClient.init()` 完成，
- *     见 `auth_bridge_component.tsx`。本函数仅做存在性校验 + console.warn。
- */
-export function initializeFacebookAuth(
-  appId: string,
-  version: string = "v25.0",
-): void {
-  if (typeof window === "undefined") return;
-  if (!appId) {
-    console.warn(
-      "[auth] initializeFacebookAuth: NEXT_PUBLIC_FACEBOOK_APP_ID is not set",
-    );
-  }
-  // version 占位：实际由 FacebookLoginClient.init({ version }) 消费
-  void version;
-}

src/data/services/auth/initialize_google_auth.ts

@@ -1,23 +0,0 @@
-"use client";
-
-/**
- * Google OAuth 预热辅助。
- *
- * 原始 Dart: `lib/utils/google_auth_initializer.dart` 的 `initializeGoogleAuth()`
- *
- * 行为：
- *   - `@react-oauth/google` 的 `<GoogleOAuthProvider>` 已经负责加载 GIS 脚本；
- *     本函数在 script 加载完成时记录一条调试日志（如果 env 缺失则 warn）。
- *   - 不发起任何网络请求；副作用仅限 console。
- *
- * 部署：本文件对应 Dart 端 `initializeGoogleAuth()` 调用位点；
- * 真实使用时机由调用方在 `useEffect` 中安排，不需要在模块顶层自动执行。
- */
-export function initializeGoogleAuth(clientId: string): void {
-  if (typeof window === "undefined") return;
-  if (!clientId) {
-    console.warn(
-      "[auth] initializeGoogleAuth: NEXT_PUBLIC_GOOGLE_CLIENT_ID is not set",
-    );
-  }
-}

src/data/services/auth/mock_auth_platform.ts

@@ -1,62 +0,0 @@
-"use client";
-
-/**
- * 模拟第三方登录平台。
- *
- * 原始 Dart: lib/data/services/auth/mock_auth_platform.dart
- *
- * 在 `NEXT_PUBLIC_USE_MOCK_AUTH=true` 时由 `AuthPlatformFactory` 注入。
- * 返回固定的 idToken / accessToken / 用户信息，附 250ms 模拟延迟便于观察 loading
- * 状态。
- */
-import { Result, type Result as ResultT } from "@/utils/result";
-import { FacebookUserData } from "@/data/dto/auth/facebook_user_data";
-import type {
-  IAuthPlatform,
-  GoogleCredential,
-  FacebookLoginResult,
-} from "./auth_platform";
-
-function sleep(ms: number): Promise<void> {
-  return new Promise((r) => setTimeout(r, ms));
-}
-
-export class MockAuthPlatform implements IAuthPlatform {
-  constructor(private readonly simulatedDelayMs: number = 250) {}
-
-  async googleSignIn(): Promise<ResultT<GoogleCredential>> {
-    await sleep(this.simulatedDelayMs);
-    return Result.ok({
-      idToken: `mock_google_id_token_${Date.now()}`,
-      email: "mock@example.com",
-      displayName: "Mock User",
-      photoUrl: "https://via.placeholder.com/150",
-    });
-  }
-
-  supportsGoogleAuthenticate(): boolean {
-    return true;
-  }
-
-  async facebookSignIn(): Promise<ResultT<FacebookLoginResult>> {
-    await sleep(this.simulatedDelayMs);
-    return Result.ok({
-      status: "success",
-      accessToken: `mock_facebook_token_${Date.now()}`,
-      userId: "mock_facebook_user_id",
-      expiresAt: Date.now() + 3600_000,
-    });
-  }
-
-  async getFacebookUserData(): Promise<ResultT<FacebookUserData>> {
-    await sleep(this.simulatedDelayMs);
-    return Result.ok(
-      FacebookUserData.from({
-        id: "mock_facebook_id",
-        name: "Mock User",
-        email: "mock@example.com",
-        pictureUrl: "https://via.placeholder.com/150",
-      }),
-    );
-  }
-}

src/data/services/auth/web_auth_platform.ts

@@ -1,195 +0,0 @@
-"use client";
-
-/**
- * Web 平台真机实现。
- *
- * 原始 Dart: lib/data/services/auth/auth_platform_web.dart
- *
- * 类本身是 plain TS，不调用 React 钩子；通过 `auth_event_bridge` 派发
- * `cozsweet:auth:*:start` 事件，由 `AuthPlatformBridge` 持有 GIS / FB SDK 钩子
- * 并在拿到凭证后回调 `platform.resolveGoogle()` / `platform.resolveFacebook()`。
- *
- * SSR 安全：
- *   - 构造函数、supportsGoogleAuthenticate() 在 server 端可用；
- *   - 业务方法在 SSR 下直接返回 failure（与 Flutter WebAuthPlatform 一致：
- *     必须由用户点击触发弹窗，服务器侧无法完成 OAuth）。
- */
-import { Result, toError, type Result as ResultT } from "@/utils/result";
-import { FacebookUserData } from "@/data/dto/auth/facebook_user_data";
-import {
-  AUTH_EVENTS,
-  dispatchAuthEvent,
-} from "./auth_event_bridge";
-import type {
-  IAuthPlatform,
-  IAuthPlatformOptions,
-  GoogleCredential,
-  FacebookLoginResult,
-} from "./auth_platform";
-
-const TIMEOUT_MS = 5 * 60 * 1000;
-
-interface PendingResolver<T> {
-  resolve: (r: ResultT<T>) => void;
-}
-
-export class WebAuthPlatform implements IAuthPlatform {
-  readonly opts: IAuthPlatformOptions;
-  private readonly pendingGoogle = new Map<
-    string,
-    PendingResolver<GoogleCredential>
-  >();
-  private readonly pendingFacebook = new Map<
-    string,
-    PendingResolver<FacebookLoginResult>
-  >();
-  private nextId = 0;
-
-  constructor(opts: IAuthPlatformOptions) {
-    this.opts = opts;
-  }
-
-  /** 由 AuthPlatformBridge 在拿到 GIS 凭证后回调。 */
-  resolveGoogle(
-    requestId: string,
-    result: ResultT<GoogleCredential>,
-  ): void {
-    const pending = this.pendingGoogle.get(requestId);
-    if (pending) {
-      pending.resolve(result);
-      this.pendingGoogle.delete(requestId);
-    }
-  }
-
-  /** 由 AuthPlatformBridge 在拿到 FB login response 后回调。 */
-  resolveFacebook(
-    requestId: string,
-    result: ResultT<FacebookLoginResult>,
-  ): void {
-    const pending = this.pendingFacebook.get(requestId);
-    if (pending) {
-      pending.resolve(result);
-      this.pendingFacebook.delete(requestId);
-    }
-  }
-
-  async googleSignIn(): Promise<ResultT<GoogleCredential>> {
-    if (typeof window === "undefined") {
-      return Result.err(new Error("googleSignIn requires a browser"));
-    }
-    if (!this.opts.googleClientId) {
-      return Result.err(
-        new Error("NEXT_PUBLIC_GOOGLE_CLIENT_ID is not set"),
-      );
-    }
-    const requestId = this.allocId();
-    return new Promise<ResultT<GoogleCredential>>((resolve) => {
-      this.pendingGoogle.set(requestId, { resolve });
-      dispatchAuthEvent(AUTH_EVENTS.googleStart, { requestId });
-      setTimeout(() => {
-        if (this.pendingGoogle.has(requestId)) {
-          this.pendingGoogle.delete(requestId);
-          resolve(Result.err(new Error("Google sign-in timed out")));
-        }
-      }, TIMEOUT_MS);
-    });
-  }
-
-  /**
-   * Web 平台使用 GIS 弹窗流程，`google.accounts.id.prompt()`，不调用
-   * "authenticate" API。返回 false 以对齐 Dart `WebAuthPlatform` 行为。
-   */
-  supportsGoogleAuthenticate(): boolean {
-    return false;
-  }
-
-  async facebookSignIn(): Promise<ResultT<FacebookLoginResult>> {
-    if (typeof window === "undefined") {
-      return Result.err(new Error("facebookSignIn requires a browser"));
-    }
-    if (!this.opts.facebookAppId) {
-      return Result.err(
-        new Error("NEXT_PUBLIC_FACEBOOK_APP_ID is not set"),
-      );
-    }
-    const requestId = this.allocId();
-    return new Promise<ResultT<FacebookLoginResult>>((resolve) => {
-      this.pendingFacebook.set(requestId, { resolve });
-      dispatchAuthEvent(AUTH_EVENTS.facebookStart, { requestId });
-      setTimeout(() => {
-        if (this.pendingFacebook.has(requestId)) {
-          this.pendingFacebook.delete(requestId);
-          resolve(Result.err(new Error("Facebook sign-in timed out")));
-        }
-      }, TIMEOUT_MS);
-    });
-  }
-
-  /**
-   * 拉取 Facebook 用户数据。
-   *
-   * 与 Dart `WebAuthPlatform.getFacebookUserData()` 对齐：调用 FB JS SDK 的
-   * `FB.api('/me', { fields })`。前提是 Bridge 已经 `FacebookLoginClient.init`
-   * 初始化过 SDK（`window.FB` 全局存在）。若 SDK 未加载则返回 failure。
-   */
-  async getFacebookUserData(): Promise<ResultT<FacebookUserData>> {
-    if (typeof window === "undefined") {
-      return Result.err(
-        new Error("getFacebookUserData requires a browser"),
-      );
-    }
-    const FB = (window as unknown as { FB?: unknown }).FB;
-    if (!FB) {
-      return Result.err(
-        new Error(
-          "Facebook SDK not loaded; call facebookSignIn() first or mount <AuthPlatformBridge>",
-        ),
-      );
-    }
-    return new Promise<ResultT<FacebookUserData>>((resolve) => {
-      try {
-        (window as unknown as {
-          FB: {
-            api: (
-              path: string,
-              params: Record<string, string>,
-              cb: (resp: Record<string, unknown>) => void,
-            ) => void;
-          };
-        }).FB.api(
-          "/me",
-          { fields: "id,name,email,picture" },
-          (resp) => {
-            if (!resp || (resp as { error?: unknown }).error) {
-              resolve(Result.err(new Error("FB.api /me failed")));
-              return;
-            }
-            const r = resp as {
-              id?: string;
-              name?: string;
-              email?: string;
-              picture?: { data?: { url?: string } };
-            };
-            resolve(
-              Result.ok(
-                FacebookUserData.from({
-                  id: r.id ?? null,
-                  name: r.name ?? null,
-                  email: r.email ?? null,
-                  pictureUrl: r.picture?.data?.url ?? null,
-                }),
-              ),
-            );
-          },
-        );
-      } catch (e) {
-        resolve(Result.err(toError(e)));
-      }
-    });
-  }
-
-  private allocId(): string {
-    this.nextId += 1;
-    return `auth-${Date.now()}-${this.nextId}`;
-  }
-}

src/data/services/index.ts

@@ -14,14 +14,7 @@ export * from "../../core/net/config/api_config";
 export * from "./api/interceptor/auth_refresh_interceptor";
 export * from "./api/interceptor/logging_interceptor";
 export * from "./api/interceptor/token_interceptor";
-export * from "./auth/auth_bridge_component";
+// 注：原 ./auth/* 平台适配层已删除（社交登录改由 NextAuth 处理）
-export * from "./auth/auth_event_bridge";
-export * from "./auth/auth_platform";
-export * from "./auth/global";
-export * from "./auth/initialize_facebook_auth";
-export * from "./auth/initialize_google_auth";
-export * from "./auth/mock_auth_platform";
-export * from "./auth/web_auth_platform";
 export * from "../dto/auth/apple_login_request";
 export * from "../dto/auth/facebook_login_request";
 export * from "../dto/auth/facebook_user_data";

src/integrations/facebook-sdk.d.ts

@@ -1,39 +0,0 @@
-/**
- * Facebook SDK 全局类型声明
- */
-export {};
-
-declare global {
-  interface Window {
-    FB?: {
-      init(params: {
-        appId: string;
-        cookie?: boolean;
-        xfbml?: boolean;
-        version: string;
-      }): void;
-      login(
-        callback: (response: {
-          authResponse?: {
-            accessToken: string;
-            userID: string;
-            expiresIn: number;
-          };
-          status?: "connected" | "not_authorized" | "unknown";
-        }) => void,
-        options?: { scope: string },
-      ): void;
-      logout(callback?: () => void): void;
-      api(
-        path: string,
-        callback: (response: {
-          id?: string;
-          name?: string;
-          email?: string;
-          picture?: { data?: { url?: string } };
-        }) => void,
-      ): void;
-    };
-    fbAsyncInit?: () => void;
-  }
-}

src/integrations/facebook-sdk.ts

@@ -1,147 +0,0 @@
-/**
- * Facebook SDK JS 封装
- *
- * 原始 Dart: `flutter_facebook_auth` 包
- * （`lib/data/services/auth/auth_platform.dart` + `auth_screen.dart` 中 Facebook 登录入口）。
- *
- * 浏览器方案：
- *   1. 在 `app/layout.tsx` 通过 `<Script src="https://connect.facebook.net/en_US/sdk.js">` 注入。
- *   2. 调用 `FB.login` / `FB.getUserData` 完成 OAuth + 用户信息获取。
- *   3. TypeScript 类型声明在 `facebook-sdk.d.ts`（`window.FB`）。
- */
-import { Result } from "@/utils/result";
-
-declare global {
-  interface Window {
-    FB?: {
-      init(params: {
-        appId: string;
-        cookie?: boolean;
-        xfbml?: boolean;
-        version: string;
-      }): void;
-      login(
-        callback: (response: {
-          authResponse?: {
-            accessToken: string;
-            userID: string;
-            expiresIn: number;
-          };
-          status?: "connected" | "not_authorized" | "unknown";
-        }) => void,
-        options?: { scope: string },
-      ): void;
-      logout(callback?: () => void): void;
-      api(
-        path: string,
-        callback: (response: {
-          id?: string;
-          name?: string;
-          email?: string;
-          picture?: { data?: { url?: string } };
-        }) => void,
-      ): void;
-    };
-    fbAsyncInit?: () => void;
-  }
-}
-
-export interface FacebookUserData {
-  id: string;
-  name?: string;
-  email?: string;
-  pictureUrl?: string;
-}
-
-const FB_APP_ID = process.env.NEXT_PUBLIC_FACEBOOK_APP_ID ?? "";
-const FB_VERSION = process.env.NEXT_PUBLIC_FACEBOOK_API_VERSION ?? "v18.0";
-
-/**
- * 初始化 FB SDK（在 `window.fbAsyncInit` 触发时调用一次）。
- * 由 `app/layout.tsx` 的 inline script 触发。
- */
-export function initFacebookSdk(): void {
-  if (typeof window === "undefined" || !window.FB) return;
-  window.FB.init({
-    appId: FB_APP_ID,
-    cookie: true,
-    xfbml: false,
-    version: FB_VERSION,
-  });
-}
-
-/**
- * 触发 Facebook OAuth 登录。
- * - 成功返回 `{ accessToken, userId }`
- * - 取消 / 失败返回 `Result.err`
- */
-export async function loginWithFacebook(): Promise<
-  Result<{ accessToken: string; userId: string }>
-> {
-  if (typeof window === "undefined" || !window.FB) {
-    return Result.err(new Error("Facebook SDK not loaded"));
-  }
-
-  return new Promise((resolve) => {
-    window.FB!.login(
-      (response) => {
-        if (!response.authResponse) {
-          resolve(
-            Result.err(new Error("Facebook login cancelled or failed")),
-          );
-          return;
-        }
-        resolve(
-          Result.ok({
-            accessToken: response.authResponse.accessToken,
-            userId: response.authResponse.userID,
-          }),
-        );
-      },
-      { scope: "email,public_profile" },
-    );
-  });
-}
-
-/**
- * 拉取 Facebook 用户信息（头像、姓名等）。
- */
-export async function getFacebookUserData(): Promise<
-  Result<FacebookUserData>
-> {
-  if (typeof window === "undefined" || !window.FB) {
-    return Result.err(new Error("Facebook SDK not loaded"));
-  }
-  return new Promise((resolve) => {
-    window.FB!.api("/me", (response) => {
-      if (!response.id) {
-        resolve(Result.err(new Error("No Facebook user data")));
-        return;
-      }
-      // 单独拉取头像
-      window.FB!.api(
-        "/me/picture?type=large&redirect=false",
-        (picResp: unknown) => {
-          const url =
-            picResp &&
-            typeof picResp === "object" &&
-            "data" in picResp &&
-            picResp.data &&
-            typeof picResp.data === "object" &&
-            "url" in picResp.data &&
-            typeof picResp.data.url === "string"
-              ? picResp.data.url
-              : undefined;
-          resolve(
-            Result.ok({
-              id: response.id!,
-              name: response.name!,
-              email: response.email!,
-              pictureUrl: url,
-            }),
-          );
-        },
-      );
-    });
-  });
-}

src/integrations/google-identity.d.ts

@@ -1,36 +0,0 @@
-/**
- * Google Identity Services 全局类型声明
- */
-export {};
-
-declare global {
-  interface Window {
-    google?: {
-      accounts: {
-        id: {
-          initialize(params: {
-            client_id: string;
-            callback: (response: { credential?: string; select_by?: string }) => void;
-            auto_select?: boolean;
-            cancel_on_tap_outside?: boolean;
-          }): void;
-          prompt(): void;
-          renderButton(
-            parent: HTMLElement,
-            options: {
-              type?: "standard" | "icon";
-              theme?: "outline" | "filled_blue" | "filled_black";
-              size?: "large" | "medium" | "small";
-              text?: "signin_with" | "signup_with" | "continue_with" | "signin";
-              shape?: "rectangular" | "pill" | "circle" | "square";
-              logo_alignment?: "left" | "center";
-              width?: number;
-              locale?: string;
-            },
-          ): void;
-          disableAutoSelect(): void;
-        };
-      };
-    };
-  }
-}

src/integrations/google-identity.ts

@@ -1,72 +0,0 @@
-/**
- * Google Identity Services (GIS) 封装
- *
- * 原始 Dart: `google_sign_in_web` 包
- * （`lib/ui/auth/widgets/google_sign_in_web.dart` + `auth_bloc._onWebGoogleLoginSuccess`）。
- *
- * 浏览器方案：
- *   1. `<Script src="https://accounts.google.com/gsi/client">` 在 layout 注入。
- *   2. `renderButton(element, options)` 渲染 GIS 按钮（自动处理 OAuth 流程）。
- *   3. 登录成功 callback 回调 `onGoogleSignInSuccess(idToken, email)`。
- *   4. 把 idToken 传给 `authRepository.googleLogin`。
- *
- * 全局类型：`google.accounts.id` 在 `google-identity.d.ts` 中声明。
- */
-import { Result } from "@/utils/result";
-
-export interface GoogleSignInSuccess {
-  idToken: string;
-  email: string;
-}
-
-let _onSuccess: ((s: GoogleSignInSuccess) => void) | null = null;
-
-/** 设置全局成功回调（auth screen 在 mount 时设置，unmount 时清空）。 */
-export function setOnGoogleSignInSuccess(
-  cb: ((s: GoogleSignInSuccess) => void) | null,
-): void {
-  _onSuccess = cb;
-}
-
-/** 渲染 GIS 按钮到指定 DOM 元素。 */
-export function renderGoogleButton(
-  element: HTMLElement,
-  options: { theme?: "outline" | "filled_blue" | "filled_black"; size?: "large" | "medium" | "small"; text?: "signin_with" | "signup_with" | "continue_with" | "signin" } = {},
-): void {
-  if (typeof window === "undefined" || !window.google?.accounts?.id) return;
-  window.google.accounts.id.renderButton(element, {
-    type: "standard",
-    theme: options.theme ?? "outline",
-    size: options.size ?? "large",
-    text: options.text ?? "continue_with",
-    shape: "pill",
-    width: element.clientWidth || 320,
-  });
-}
-
-/** 触发 GIS One Tap 提示（如果用户已登录过 Google）。 */
-export function promptGoogleOneTap(): Result<true> {
-  if (typeof window === "undefined" || !window.google?.accounts?.id) {
-    return Result.err(new Error("Google Identity Services not loaded"));
-  }
-  window.google.accounts.id.prompt();
-  return Result.ok(true);
-}
-
-/** 处理 GIS 凭据回调（由 GIS 内部调用）。 */
-export function handleGoogleCredentialResponse(
-  response: { credential?: string; select_by?: string },
-): Result<GoogleSignInSuccess> {
-  if (!response.credential) {
-    return Result.err(new Error("No Google credential returned"));
-  }
-  // GIS 凭据是 JWT；本仓库不解析（idToken 直接交给后端校验），
-  // email 字段需前端手动解码或由后端从 idToken 提取。
-  // 此处仅返回 idToken，email 留空（后端会从 idToken 还原）。
-  const success: GoogleSignInSuccess = {
-    idToken: response.credential,
-    email: "",
-  };
-  _onSuccess?.(success);
-  return Result.ok(success);
-}

src/integrations/index.ts

@@ -4,9 +4,5 @@
 
 export * from "./browser-detect";
 export * from "./chat-websocket";
-export * from "./facebook-sdk";
-export * from "./facebook-sdk";
-export * from "./google-identity";
-export * from "./google-identity";
 export * from "./media-recorder";
 export * from "./message-queue";

src/lib/auth/config.ts

@@ -0,0 +1,129 @@
+/**
+ * NextAuth 配置
+ *
+ * 集中管理 OAuth providers（Google + Facebook）+ session 策略 + 回调。
+ * 由 `src/app/api/auth/[...nextauth]/route.ts` 引用。
+ *
+ * Session 策略：**JWT**（无服务端存储；token 签名 / 过期由 next-auth 内部处理）。
+ * 业务层 token（用于后端鉴权）通过 `signIn` callback 写入 unstorage `StorageKeys.loginToken`。
+ */
+import type { NextAuthOptions } from "next-auth";
+import GoogleProvider from "next-auth/providers/google";
+import FacebookProvider from "next-auth/providers/facebook";
+
+const useSecureCookies = process.env.NODE_ENV === "production";
+const cookiePrefix = useSecureCookies ? "__Secure-" : "";
+
+const cookieConfig = {
+  // 默认 cookie 名（next-auth v4 默认）
+  sessionToken: {
+    name: `${cookiePrefix}next-auth.session-token`,
+    options: {
+      httpOnly: true,
+      sameSite: "lax" as const,
+      path: "/",
+      secure: useSecureCookies,
+    },
+  },
+};
+
+export const authOptions: NextAuthOptions = {
+  // ===== Providers =====
+  providers: [
+    GoogleProvider({
+      clientId: process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID ?? "",
+      clientSecret: process.env.GOOGLE_CLIENT_SECRET ?? "",
+    }),
+    FacebookProvider({
+      clientId: process.env.NEXT_PUBLIC_FACEBOOK_APP_ID ?? "",
+      clientSecret: process.env.FACEBOOK_APP_SECRET ?? "",
+    }),
+  ],
+
+  // ===== Session =====
+  session: { strategy: "jwt" },
+
+  // ===== Cookie =====
+  cookies: cookieConfig,
+
+  // ===== Pages =====
+  // OAuth 流程中 NextAuth 重定向到这些路径
+  pages: {
+    signIn: "/auth",
+    error: "/auth",
+  },
+
+  // ===== Callbacks =====
+  callbacks: {
+    /**
+     * 登录成功时同步用户到后端（写入 unstorage + 后端用户表）
+     * 业务层 token 持久化在 `jwt` callback 中
+     */
+    async signIn({ user, account, profile }) {
+      if (!account || !user) return false;
+
+      // 仅对 OAuth provider 触发后端同步（credentials provider 走 emailLogin 流程）
+      if (account.provider === "google" || account.provider === "facebook") {
+        // 通过 dynamic import 避免循环依赖 + SSR 时不加载
+        const { handleSocialSignIn } = await import("./nextauth-helpers");
+        const result = await handleSocialSignIn({
+          provider: account.provider,
+          user,
+          account,
+          profile,
+        });
+        return result;
+      }
+      return true;
+    },
+
+    /**
+     * JWT callback：在 token 中携带业务字段（loginToken、userId）
+     * 业务层可从 `useSession().data` 读到这些字段
+     */
+    async jwt({ token, user, account }) {
+      if (user && account) {
+        // 首次登录时，从 signIn callback 写入的 unstorage 读取
+        if (account.provider === "google" || account.provider === "facebook") {
+          const { getSocialSession } = await import("./nextauth-helpers");
+          const session = await getSocialSession();
+          if (session) {
+            token.loginToken = session.loginToken;
+            token.refreshToken = session.refreshToken;
+            token.userId = session.userId;
+            token.provider = account.provider;
+          }
+        }
+      }
+      return token;
+    },
+
+    /**
+     * Session callback：把 JWT 中的字段暴露给 `useSession()`
+     */
+    async session({ session, token }) {
+      if (session.user) {
+        (session as unknown as Record<string, unknown>).loginToken =
+          token.loginToken;
+        (session as unknown as Record<string, unknown>).userId = token.userId;
+        (session as unknown as Record<string, unknown>).provider =
+          token.provider;
+      }
+      return session;
+    },
+  },
+
+  // ===== Secret =====
+  secret: process.env.NEXTAUTH_SECRET ?? "dev-secret-change-in-prod",
+};
+
+/**
+ * 扩展 next-auth Session 类型，加入业务字段
+ */
+declare module "next-auth" {
+  interface Session {
+    loginToken?: string;
+    userId?: string;
+    provider?: string;
+  }
+}

src/lib/auth/nextauth-helpers.ts

@@ -0,0 +1,181 @@
+/**
+ * NextAuth 业务层 helpers
+ *
+ * 处理 OAuth 登录后的"业务层同步"：
+ *   1. Google/Facebook OAuth 完成 → NextAuth 返回 user/account/profile
+ *   2. 用 idToken / accessToken 调后端 `authRepository.googleLogin` / `facebookLogin`
+ *   3. 后端返回 `LoginResponse`（含业务 token + user）
+ *   4. 写入 unstorage + NextAuth JWT
+ *
+ * 同时提供 `useAuthGate()` 包装（保持原 API 形状，内部用 `useSession()` 实现）。
+ */
+import { useSession } from "next-auth/react";
+import type { Account, Profile, User } from "next-auth";
+
+import { authRepository } from "@/data/repositories/auth_repository";
+import { SpAsyncUtil } from "@/utils/storage";
+import { Result } from "@/utils/result";
+import { StorageKeys } from "@/data/storage/storage_keys";
+
+/** 暴露给外部的：Google 登录 */
+export async function googleLogin(): Promise<Result<{ isNewUser: boolean }>> {
+  // NextAuth 在客户端通过 signIn() 触发跳转；服务端场景下可通过 POST /api/auth/signin/google
+  // 本函数封装整个流程：触发 NextAuth OAuth → 后端同步 → 返回业务 session
+  const { signIn } = await import("next-auth/react");
+  const result = await signIn("google", {
+    redirect: false,
+    callbackUrl: "/chat",
+  });
+  if (!result || result.error) {
+    return Result.err(new Error(result?.error ?? "Google sign-in failed"));
+  }
+  return Result.ok({ isNewUser: false });
+}
+
+/** 暴露给外部的：Facebook 登录 */
+export async function facebookLogin(): Promise<Result<{ isNewUser: boolean }>> {
+  const { signIn } = await import("next-auth/react");
+  const result = await signIn("facebook", {
+    redirect: false,
+    callbackUrl: "/chat",
+  });
+  if (!result || result.error) {
+    return Result.err(new Error(result?.error ?? "Facebook sign-in failed"));
+  }
+  return Result.ok({ isNewUser: false });
+}
+
+/** 暴露给外部的：登出 */
+export async function logout(): Promise<Result<void>> {
+  const { signOut } = await import("next-auth/react");
+  await signOut({ redirect: false });
+  // 清理业务层 token
+  await SpAsyncUtil.remove(StorageKeys.loginToken);
+  await SpAsyncUtil.remove(StorageKeys.refreshToken);
+  return Result.ok(undefined);
+}
+
+// ============================================================
+// 内部：signIn callback 用的业务层同步
+// ============================================================
+
+interface SocialSignInInput {
+  provider: string;
+  user: User;
+  account: Account;
+  profile?: Profile;
+}
+
+/**
+ * OAuth 登录完成后调后端同步用户。
+ * 写入 unstorage（业务 token）+ NextAuth session 字段。
+ *
+ * 返回 `true` 允许 NextAuth 完成登录；`false` 中止。
+ */
+export async function handleSocialSignIn(
+  input: SocialSignInInput,
+): Promise<boolean> {
+  try {
+    const guestId = await readGuestId();
+
+    if (input.provider === "google") {
+      // Google：NextAuth 拿到的 idToken 来自 account.id_token
+      const idToken = input.account.id_token;
+      if (!idToken) {
+        console.error("[nextauth-helpers] Google id_token missing");
+        return false;
+      }
+      const email = input.user.email ?? "";
+      const result = await authRepository.googleLogin({ idToken, guestId });
+      if (Result.isErr(result)) {
+        console.error("[nextauth-helpers] Google backend login failed", result.error);
+        return false;
+      }
+      await persistBackendSession(result.data);
+      return true;
+    }
+
+    if (input.provider === "facebook") {
+      // Facebook：accessToken 来自 account.access_token
+      const accessToken = input.account.access_token;
+      if (!accessToken) {
+        console.error("[nextauth-helpers] Facebook access_token missing");
+        return false;
+      }
+      const result = await authRepository.facebookLogin({ accessToken, guestId });
+      if (Result.isErr(result)) {
+        console.error("[nextauth-helpers] Facebook backend login failed", result.error);
+        return false;
+      }
+      await persistBackendSession(result.data);
+      return true;
+    }
+
+    return false;
+  } catch (e) {
+    console.error("[nextauth-helpers] social sign-in error", e);
+    return false;
+  }
+}
+
+interface SocialSession {
+  loginToken: string;
+  refreshToken?: string;
+  userId: string;
+}
+
+/**
+ * 把后端返回的 LoginResponse 写入 NextAuth 可访问的临时存储。
+ * jwt callback 中会从这里读取。
+ */
+async function persistBackendSession(data: {
+  token: string;
+  refreshToken?: string;
+  user: { id: string };
+}): Promise<void> {
+  await SpAsyncUtil.setString(StorageKeys.loginToken, data.token);
+  if (data.refreshToken) {
+    await SpAsyncUtil.setString(StorageKeys.refreshToken, data.refreshToken);
+  }
+  // userId 写入 unstorage（其他业务模块通过 useUserState 读）
+  await SpAsyncUtil.setString(StorageKeys.userId, data.user.id);
+}
+
+export async function getSocialSession(): Promise<SocialSession | null> {
+  // 从 unstorage 读取（之前 persistBackendSession 写入的）
+  const tokenR = await SpAsyncUtil.getString(StorageKeys.loginToken);
+  const userIdR = await SpAsyncUtil.getString(StorageKeys.userId);
+  const refreshR = await SpAsyncUtil.getString(StorageKeys.refreshToken);
+  if (!tokenR.success || !tokenR.data || !userIdR.success || !userIdR.data) {
+    return null;
+  }
+  return {
+    loginToken: tokenR.data,
+    userId: userIdR.data,
+    refreshToken: refreshR.success ? refreshR.data ?? undefined : undefined,
+  };
+}
+
+// ============================================================
+// 客户端鉴权门 hook（保持原 useAuthGate 形状，内部用 useSession）
+// ============================================================
+
+export interface AuthGateState {
+  isAuthed: boolean;
+}
+
+export function useAuthGate(): AuthGateState {
+  const { data: session } = useSession();
+  return { isAuthed: Boolean(session?.user) };
+}
+
+// ============================================================
+// 内部 helpers
+// ============================================================
+async function readGuestId(): Promise<string | undefined> {
+  const r = await SpAsyncUtil.getString(StorageKeys.deviceId);
+  if (r.success && r.data != null && r.data.length > 0) {
+    return r.data;
+  }
+  return undefined;
+}

src/lib/auth/nextauth.ts

@@ -0,0 +1,27 @@
+/**
+ * NextAuth 业务层主入口
+ *
+ * 对外提供两个干净的登录接口（用户要求）：
+ *   - `googleLogin()`   — 触发 Google OAuth 登录
+ *   - `facebookLogin()` — 触发 Facebook OAuth 登录
+ *
+ * 调用方（splash-button / auth-facebook-panel / splash-screen）：
+ *   ```ts
+ *   import { googleLogin, facebookLogin, useAuthGate } from "@/lib/auth/nextauth";
+ *
+ *   const r = await googleLogin();
+ *   if (r.success) { ... }
+ *   ```
+ *
+ * 兼容：
+ *   - `useAuthGate()` API 与旧 hook 完全相同（业务层零修改）
+ *   - 内部实现用 `useSession()`（NextAuth 客户端 API）
+ *   - 后端同步通过 `nextauth-helpers.handleSocialSignIn` 在 NextAuth signIn callback 中完成
+ */
+export {
+  googleLogin,
+  facebookLogin,
+  logout,
+  useAuthGate,
+  type AuthGateState,
+} from "./nextauth-helpers";

src/lib/auth/route-guards.ts

@@ -1,36 +0,0 @@
-/**
- * 纯函数路由守卫
- *
- * 不依赖 React/Next.js，可被 `src/proxy.ts`（边缘运行时）与
- * `src/lib/auth/use-auth-gate.tsx`（客户端 hook）共用。
- *
- * 对齐 Flutter `lib/router/app_router.dart` 中 `_handleAuthRedirect` 的语义：
- * 已登录用户访问 `/splash` 或 `/auth` 时，重定向到 `/chat`。
- */
-
-import { AUTH_ONLY_ROUTES, ROUTES, type StaticRoute } from "../routes";
-
-/**
- * 判定路径是否为"仅未登录态可见"的入口路由。
- */
-export function isAuthOnlyRoute(pathname: string): pathname is StaticRoute {
-  return (AUTH_ONLY_ROUTES as readonly string[]).includes(pathname);
-}
-
-/**
- * 判定路径是否为公开路由（游客态也允许访问）。
- */
-export function isPublicRoute(pathname: string): pathname is StaticRoute {
-  return pathname === ROUTES.chat || pathname === ROUTES.sidebar;
-}
-
-/**
- * 已登录用户访问入口路由时返回应跳转到的目标；其余情况返回 null。
- *
- * 当前实现仅做"splash/auth → chat"的重定向；未来若新增入口路由（如 onboarding），
- * 只需在此函数追加分支。
- */
-export function resolveAuthedRedirect(pathname: string): string | null {
-  if (isAuthOnlyRoute(pathname)) return ROUTES.chat;
-  return null;
-}

src/lib/auth/use-auth-gate.tsx

@@ -1,56 +0,0 @@
-"use client";
-
-/**
- * 客户端鉴权门 hook
- *
- * 单一真值 = `window.localStorage[StorageKeys.loginToken]`。
- * 故意不引入 Context/Zustand：本轮只有 splash/auth 两处使用，直接 hook 调用更直白。
- *
- * 实现要点（React 19 / Next.js 16 约定）：
- *   - 用 `useSyncExternalStore` 而非 `useEffect + setState`，避免 React 19
- *     `react-hooks/set-state-in-effect` 规则的级联渲染告警。
- *   - `getServerSnapshot` 返回 `false` → SSR 与客户端水合首帧都拿到一致值；
- *     水合完成后 React 自动重读 `getSnapshot()`（localStorage 真值），触发单次
- *     自然重渲染 → 调用方 `useEffect([isAuthed], ...)` 即捕获"已登录"事件。
- *   - subscribe 用空函数（no-op）：localStorage 在本应用生命周期内不会主动变化
- *     （登录跳转走的是另一条 navigation 路径，重新进入 splash 时会重读）。
- *
- * 使用模式：
- *   const { isAuthed } = useAuthGate();
- *   useEffect(() => { if (isAuthed) router.replace(ROUTES.chat); }, [isAuthed]);
- *   if (!isAuthed) return <Placeholder />;   // SSR / 水合首帧 / 未登录 都会落在这
- *
- * 注：本轮不暴露 `ready` 标志——`useSyncExternalStore` 自身的 SSR / 客户端差异
- * 处理已经能保证水合首帧拿到 `false`（与 SSR 一致），无需调用方再判 ready。
- *
- * 注意：直接读 `window.localStorage` 是因为 `useSyncExternalStore.getSnapshot`
- * 必须是同步函数。`AuthStorage.hasLoginToken()` 是 async，无法在此处使用。
- */
-
-import { useSyncExternalStore } from "react";
-
-import { StorageKeys } from "@/data/storage/storage_keys";
-
-export interface AuthGateState {
-  /** 已登录（持有非空 `cozsweet.loginToken`） */
-  isAuthed: boolean;
-}
-
-// 静态 subscribe：localStorage 在本应用生命周期内不会主动变化。
-const subscribe = (): (() => void) => () => {};
-
-/**
- * 同步读取 localStorage 中的 login_token（与 `AuthStorage.hasLoginToken` 语义一致）
- */
-const getSnapshot = (): boolean => {
-  if (typeof window === "undefined") return false;
-  const token = window.localStorage.getItem(StorageKeys.loginToken);
-  return token !== null && token.length > 0;
-};
-
-const getServerSnapshot = (): boolean => false;
-
-export function useAuthGate(): AuthGateState {
-  const isAuthed = useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot);
-  return { isAuthed };
-}

src/lib/index.ts

@@ -1,10 +1,10 @@
 /**
  * `src/lib/` 手写 barrel
  *
- * 注意：故意**不**把 `src/lib/auth/use-auth-gate.tsx`（Client-only）放进来，
+ * 注意：故意**不**把 `src/lib/auth/nextauth.ts`（Client-only）放进来，
  * 避免 Server bundle 误把 React 客户端代码拉进去。
- * 如需导入 hook，请直接 `import { useAuthGate } from "@/lib/auth/use-auth-gate";`。
+ * 如需导入，请直接 `import { ... } from "@/lib/auth/nextauth";`。
  */
 
 export * from "./routes";
-export * from "./auth/route-guards";
+export * from "./auth/nextauth-helpers";

src/proxy.ts

@@ -2,17 +2,15 @@
  * Next.js 16 Proxy（原 `middleware.ts`）
  *
  * 行为：
- *   - 当请求携带 `login_token` cookie 且命中 `/splash` 或 `/auth` 时，308 重定向到 `/chat`。
+ *   - 当请求携带 NextAuth `next-auth.session-token` cookie 且命中 `/splash` 或 `/auth`
+ *     时，308 重定向到 `/chat`。
  *   - 其他情况透传（`NextResponse.next()`）。
  *
  * 重要约束：
- *   - **不**对 `/chat` 做反向重定向：游客态是合法用户（`auth_refresh_interceptor`
+ *   - **不**对 `/chat` 做反向重定向：游客态是合法用户。
- *     同时处理登录与游客 token），proxy 端无法识别 `guest_token`。
+ *   - NextAuth 的 session cookie 由 `src/lib/auth/config.ts` 集中管理；本 proxy 仅做
- *   - 当前没有 `login_token` cookie 被写入（token 走 localStorage），proxy 实际是 no-op；
+ *     CDN 友好的"乐观"快路径。
- *     保留骨架便于未来 HttpOnly Cookie 迁移（`src/data/storage/auth/auth_storage.ts`
+ *   - 真正的鉴权门在 Client 侧 `useAuthGate()`（用 `useSession()`）。
- *     的 TODO 标记）时无需重构 proxy。
- *   - 边缘代理**读不到 localStorage**，因此真正的鉴权门是 Client 侧的
- *     `useAuthGate` + `authStorage.hasLoginToken()`，proxy 只是 CDN 友好的"乐观"快路径。
  *
  * Next 16 重要变更（参见 `node_modules/next/dist/docs/01-app/03-api-reference/03-file-conventions/proxy.md`）：
  *   - 文件从 `middleware.ts` 重命名为 `proxy.ts`；`middleware` 仍可用但已 deprecated。
@@ -25,26 +23,36 @@
 import { NextResponse } from "next/server";
 import type { NextRequest } from "next/server";
 
-import { resolveAuthedRedirect } from "@/lib/auth/route-guards";
+import {
+  AUTH_ONLY_ROUTES,
+  ROUTES,
+  type StaticRoute,
+} from "@/lib/routes";
 
-const LOGIN_COOKIE = "login_token";
+const SESSION_COOKIE_NAMES = [
+  "next-auth.session-token",
+  "__Secure-next-auth.session-token",
+];
+
+function isAuthOnlyRoute(pathname: string): pathname is StaticRoute {
+  return (AUTH_ONLY_ROUTES as readonly string[]).includes(pathname);
+}
 
 /**
  * Proxy 入口
  */
 export function proxy(request: NextRequest) {
   const { pathname } = request.nextUrl;
-  const hasLoginCookie = Boolean(request.cookies.get(LOGIN_COOKIE)?.value);
 
-  if (hasLoginCookie) {
+  // 检查 NextAuth session cookie 存在性（cookie value 存在即认为已登录）
-    const target = resolveAuthedRedirect(pathname);
+  const hasSession = SESSION_COOKIE_NAMES.some(
-    if (target) {
+    (name) => Boolean(request.cookies.get(name)?.value),
-      const url = request.nextUrl.clone();
+  );
-      url.pathname = target;
+
-      // 308 = 永久。注销后若浏览器/CDN 缓存了 308，可能黏住。
+  if (hasSession && isAuthOnlyRoute(pathname)) {
-      // 若担心可改 307（临时）；本轮按 plan 口径用 308 并在 plan 中记录风险。
+    const url = request.nextUrl.clone();
-      return NextResponse.redirect(url, 308);
+    url.pathname = ROUTES.chat;
-    }
+    return NextResponse.redirect(url, 308);
   }
 
   return NextResponse.next();

src/stores/auth/auth-context.tsx

@@ -55,10 +55,9 @@ export function AuthProvider({ children }: AuthProviderProps) {
       password: state.context.password,
       username: state.context.username,
       confirmPassword: state.context.confirmPassword,
+      // isLoading 仅来自邮箱登录 actor（社交登录改由 NextAuth 处理，UI 自行管 busy 状态）
       isLoading: state.matches("loadingEmailLogin") ||
-        state.matches("loadingEmailRegister") ||
+        state.matches("loadingEmailRegister"),
-        state.matches("loadingFacebookLogin") ||
-        state.matches("loadingWebGoogleLogin"),
       errorMessage: state.context.errorMessage,
       isSuccess: state.matches("success"),
       loginType: state.context.loginType,

src/stores/auth/auth-machine.ts

@@ -3,11 +3,8 @@
  *
  * 原始 Dart: lib/ui/auth/bloc/auth_bloc.dart + auth_state.dart + auth_event.dart
  *
- * 设计要点：
+ * 本轮迁移：社交登录改由 NextAuth 处理（`@/lib/auth/nextauth`），状态机仅保留
- *   - 使用 XState v5 `setup({...}).createMachine({...})` 声明式 API
+ * 邮箱注册/登录 + 通用 reset 事件。社交登录直接 `await nextauth.googleLogin()` 即可。
- *   - 异步副作用用 `fromPromise` actor 包装（自动取消、错误捕获）
- *   - 表单字段值放在 `context`，UI 通过事件更新
- *   - 保持事件类型名与原 Dart 一致，便于业务层迁移对照
  */
 import { setup, fromPromise, assign } from "xstate";
 
@@ -16,10 +13,6 @@ import type { AuthPanelMode } from "@/models/auth/auth-panel-mode";
 import type { LoginType } from "@/models/auth/login-type";
 import { authRepository } from "@/data/repositories/auth_repository";
 import { AuthStorage } from "@/data/storage/auth/auth_storage";
-import {
-  loginWithFacebook,
-  getFacebookUserData,
-} from "@/integrations/facebook-sdk";
 import { Result } from "@/utils/result";
 
 // ============================================================
@@ -67,18 +60,14 @@ export type AuthEvent =
       username: string;
       confirmPassword: string;
     }
+  // 社交登录（已迁移到 NextAuth）— 业务层直接 await nextauth.googleLogin() 即可
   | { type: "AuthGoogleLoginSubmitted" }
   | { type: "AuthFacebookLoginSubmitted" }
-  | { type: "AuthAppleLoginSubmitted" }
+  | { type: "AuthAppleLoginSubmitted" };
-  | { type: "AuthWebGoogleLoginSuccess"; idToken: string; email: string };
 
 // ============================================================
 // Helpers
 // ============================================================
-/**
- * 从存储读取 guestId，失败或缺失返回 undefined
- * 用 if 语句避免 TS 联合类型 narrowing 问题
- */
 async function readGuestId(): Promise<string | undefined> {
   const r = await AuthStorage.getInstance().getDeviceId();
   if (r.success && r.data != null) {
@@ -118,37 +107,6 @@ const emailRegisterThenLoginActor = fromPromise<
   return "email" as LoginType;
 });
 
-const googleLoginActor = fromPromise<LoginType, { idToken: string }>(async ({ input }) => {
-  const guestId = await readGuestId();
-  const result = await authRepository.googleLogin({ idToken: input.idToken, guestId });
-  if (Result.isErr(result)) throw result.error;
-  return "google" as LoginType;
-});
-
-const facebookLoginActor = fromPromise<LoginType, Record<string, never>>(
-  async () => {
-    const guestId = await readGuestId();
-
-    const fbResult = await loginWithFacebook();
-    if (Result.isErr(fbResult)) throw fbResult.error;
-
-    const authResult = await authRepository.facebookLogin({
-      accessToken: fbResult.data.accessToken,
-      guestId,
-    });
-    if (Result.isErr(authResult)) throw authResult.error;
-
-    // best-effort：异步上传 Facebook 头像
-    void (async () => {
-      const userData = await getFacebookUserData();
-      if (Result.isOk(userData) && userData.data.pictureUrl) {
-        // TODO: 调用 userStorage.setAvatarUrl
-      }
-    })();
-    return "facebook" as LoginType;
-  },
-);
-
 // ============================================================
 // Machine
 // ============================================================
@@ -160,8 +118,6 @@ export const authMachine = setup({
   actors: {
     emailLogin: emailLoginActor,
     emailRegisterThenLogin: emailRegisterThenLoginActor,
-    googleLogin: googleLoginActor,
-    facebookLogin: facebookLoginActor,
   },
 }).createMachine({
   id: "auth",
@@ -196,18 +152,15 @@ export const authMachine = setup({
         },
         AuthEmailLoginSubmitted: "loadingEmailLogin",
         AuthEmailRegisterSubmitted: "loadingEmailRegister",
-        AuthGoogleLoginSubmitted: {
+        // 社交登录已迁移到 NextAuth，业务层直接 await nextauth.googleLogin() / nextauth.facebookLogin()
-          actions: assign({
+        // 状态机保留事件以兼容旧调用方（实际不再触发）
-            errorMessage: "Use the Google button to sign in on web",
+        AuthGoogleLoginSubmitted: {},
-          }),
+        AuthFacebookLoginSubmitted: {},
-        },
-        AuthFacebookLoginSubmitted: "loadingFacebookLogin",
         AuthAppleLoginSubmitted: {
           actions: assign({
             errorMessage: "Apple login not implemented",
           }),
         },
-        AuthWebGoogleLoginSuccess: "loadingWebGoogleLogin",
       },
     },
 
@@ -266,55 +219,8 @@ export const authMachine = setup({
       },
     },
 
-    loadingFacebookLogin: {
-      invoke: {
-        src: "facebookLogin",
-        input: () => ({}),
-        onDone: {
-          target: "success",
-          actions: assign({
-            loginType: ({ event }) => event.output,
-            errorMessage: null,
-          }),
-        },
-        onError: {
-          target: "idle",
-          actions: assign({
-            errorMessage: ({ event }) =>
-              event.error instanceof Error ? event.error.message : String(event.error),
-          }),
-        },
-      },
-    },
-
-    loadingWebGoogleLogin: {
-      invoke: {
-        src: "googleLogin",
-        input: ({ event }) => {
-          if (event.type !== "AuthWebGoogleLoginSuccess")
-            return { idToken: "" };
-          return { idToken: event.idToken };
-        },
-        onDone: {
-          target: "success",
-          actions: assign({
-            loginType: ({ event }) => event.output,
-            errorMessage: null,
-          }),
-        },
-        onError: {
-          target: "idle",
-          actions: assign({
-            errorMessage: ({ event }) =>
-              event.error instanceof Error ? event.error.message : String(event.error),
-          }),
-        },
-      },
-    },
-
     success: {
       // 终态：业务层通过 state.matches("success") 判断
-      // isSuccess 由 context 推算（loginType !== "none"）
     },
   },
 });