...

.env.example

@@ -3,10 +3,10 @@ ZHIPU_API_KEY=
 ZHIPU_MODEL_NAME=
 
 // Auth
-AUTH_SECRET=
+BETTER_AUTH_SECRET=
+BETTER_AUTH_URL=
 GITHUB_CLIENT_ID=
 GITHUB_CLIENT_SECRET=
-NEXTAUTH_URL=
 
 // Database
 DATABASE_URL=

.vscode/settings.json

@@ -0,0 +1,10 @@
+{
+    "typescript.tsdk": "node_modules/typescript/lib",
+    "editor.defaultFormatter": null,
+    "[typescript]": {
+        "editor.defaultFormatter": "vscode.typescript-language-features"
+    },
+    "[typescriptreact]": {
+        "editor.defaultFormatter": "vscode.typescript-language-features"
+    }
+}

eslint.config.mjs

@@ -1,25 +1,16 @@
-import { dirname } from "path";
-import { fileURLToPath } from "url";
-import { FlatCompat } from "@eslint/eslintrc";
+import { defineConfig, globalIgnores } from 'eslint/config'
+import nextVitals from 'eslint-config-next/core-web-vitals'
  
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = dirname(__filename);
+const eslintConfig = defineConfig([
+  ...nextVitals,
+  // Override default ignores of eslint-config-next.
+  globalIgnores([
+    // Default ignores of eslint-config-next:
+    '.next/**',
+    'out/**',
+    'build/**',
+    'next-env.d.ts',
+  ]),
+])
  
-const compat = new FlatCompat({
-  baseDirectory: __dirname,
-});
-
-const eslintConfig = [
-  ...compat.extends("next/core-web-vitals", "next/typescript"),
-  {
-    ignores: [
-      "node_modules/**",
-      ".next/**",
-      "out/**",
-      "build/**",
-      "next-env.d.ts",
-    ],
-  },
-];
-
-export default eslintConfig;
+export default eslintConfig

messages/en-US.json

@@ -105,7 +105,7 @@
     "title": "learn-languages",
     "about": "About",
     "sourceCode": "GitHub",
-    "login": "Login",
+    "sign_in": "Sign In",
     "profile": "Profile",
     "folders": "Folders"
   },

messages/zh-CN.json

@@ -109,7 +109,7 @@
     "title": "学语言",
     "about": "关于",
     "sourceCode": "源码",
-    "login": "登录",
+    "sign_in": "登录",
     "profile": "个人资料",
     "folders": "文件夹"
   },

package.json

@@ -14,29 +14,33 @@
     "@prisma/adapter-pg": "^7.1.0",
     "@prisma/client": "^7.1.0",
     "bcryptjs": "^3.0.3",
+    "better-auth": "^1.4.6",
+    "dotenv": "^17.2.3",
     "edge-tts-universal": "^1.3.3",
-    "lucide-react": "^0.553.0",
-    "next": "16.0.7",
-    "next-auth": "5.0.0-beta.30",
+    "lucide-react": "^0.556.0",
+    "next": "16.0.8",
     "next-intl": "^4.5.8",
     "pg": "^8.16.3",
     "react": "19.2.1",
     "react-dom": "19.2.1",
     "sonner": "^2.0.7",
     "unstorage": "^1.17.3",
-    "zod": "^3.25.76"
+    "zod": "^4.1.13"
   },
   "devDependencies": {
+    "@better-auth/cli": "^1.4.6",
     "@eslint/eslintrc": "^3.3.3",
     "@tailwindcss/postcss": "^4.1.17",
-    "@types/bcryptjs": "^2.4.6",
-    "@types/node": "^20.19.25",
+    "@types/node": "^24.10.2",
     "@types/react": "19.2.7",
     "@types/react-dom": "19.2.3",
+    "@typescript-eslint/eslint-plugin": "^8.49.0",
+    "@typescript-eslint/parser": "^8.49.0",
     "babel-plugin-react-compiler": "^1.0.0",
     "eslint": "^9.39.1",
-    "eslint-config-next": "16.0.7",
-    "prisma": "^6.19.0",
+    "eslint-config-next": "16.0.8",
+    "eslint-plugin-react": "^7.37.5",
+    "prisma": "^7.1.0",
     "tailwindcss": "^4.1.17",
     "typescript": "^5.9.3"
   },
@@ -44,6 +48,9 @@
     "overrides": {
       "@types/react": "19.2.7",
       "@types/react-dom": "19.2.3"
-    }
+    },
+    "ignoredBuiltDependencies": [
+      "@prisma/client"
+    ]
   }
 }

prisma.config.ts

@@ -5,7 +5,6 @@ export default defineConfig({
   migrations: {
     path: "prisma/migrations",
   },
-  engine: "classic",
   datasource: {
     url: env("DATABASE_URL"),
   },

prisma/migrations/20251204102820_init/migration.sql

@@ -1,71 +0,0 @@
-/*
-  Warnings:
-
-  - You are about to drop the `folder` table. If the table is not empty, all the data it contains will be lost.
-  - You are about to drop the `text_pair` table. If the table is not empty, all the data it contains will be lost.
-
-*/
--- DropForeignKey
-ALTER TABLE "text_pair" DROP CONSTRAINT "fk_text_pairs_folder";
-
--- DropTable
-DROP TABLE "folder";
-
--- DropTable
-DROP TABLE "text_pair";
-
--- CreateTable
-CREATE TABLE "pairs" (
-    "id" SERIAL NOT NULL,
-    "locale1" VARCHAR(10) NOT NULL,
-    "locale2" VARCHAR(10) NOT NULL,
-    "text1" TEXT NOT NULL,
-    "text2" TEXT NOT NULL,
-    "ipa1" TEXT,
-    "ipa2" TEXT,
-    "folder_id" INTEGER NOT NULL,
-    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "updated_at" TIMESTAMP(3) NOT NULL,
-
-    CONSTRAINT "pairs_pkey" PRIMARY KEY ("id")
-);
-
--- CreateTable
-CREATE TABLE "folders" (
-    "id" SERIAL NOT NULL,
-    "name" TEXT NOT NULL,
-    "user_id" INTEGER NOT NULL,
-    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "updated_at" TIMESTAMP(3) NOT NULL,
-
-    CONSTRAINT "folders_pkey" PRIMARY KEY ("id")
-);
-
--- CreateTable
-CREATE TABLE "users" (
-    "id" SERIAL NOT NULL,
-    "email" TEXT NOT NULL,
-    "name" TEXT NOT NULL,
-    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "updated_at" TIMESTAMP(3) NOT NULL,
-
-    CONSTRAINT "users_pkey" PRIMARY KEY ("id")
-);
-
--- CreateIndex
-CREATE INDEX "pairs_folder_id_idx" ON "pairs"("folder_id");
-
--- CreateIndex
-CREATE UNIQUE INDEX "pairs_folder_id_locale1_locale2_text1_key" ON "pairs"("folder_id", "locale1", "locale2", "text1");
-
--- CreateIndex
-CREATE INDEX "folders_user_id_idx" ON "folders"("user_id");
-
--- CreateIndex
-CREATE UNIQUE INDEX "users_email_key" ON "users"("email");
-
--- AddForeignKey
-ALTER TABLE "pairs" ADD CONSTRAINT "pairs_folder_id_fkey" FOREIGN KEY ("folder_id") REFERENCES "folders"("id") ON DELETE CASCADE ON UPDATE CASCADE;
-
--- AddForeignKey
-ALTER TABLE "folders" ADD CONSTRAINT "folders_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;

prisma/schema.prisma

@@ -1,3 +1,4 @@
+
 generator client {
   provider = "prisma-client"
   output   = "../generated/prisma"
@@ -29,7 +30,7 @@ model Pair {
 model Folder {
   id        Int      @id @default(autoincrement())
   name      String
-  userId    Int      @map("user_id")
+  userId    String   @map("user_id")
   createdAt DateTime @default(now()) @map("created_at")
   updatedAt DateTime @updatedAt @map("updated_at")
 
@@ -41,13 +42,65 @@ model Folder {
 }
 
 model User {
-  id        Int      @id @default(autoincrement())
-  email     String   @unique
+  id            String    @id
   name          String
-  createdAt DateTime @default(now()) @map("created_at")
-  updatedAt DateTime @updatedAt @map("updated_at")
-
+  email         String
+  emailVerified Boolean   @default(false)
+  image         String?
+  createdAt     DateTime  @default(now())
+  updatedAt     DateTime  @updatedAt
+  sessions      Session[]
+  accounts      Account[]
   folders       Folder[]
 
-  @@map("users")
+  @@unique([email])
+  @@map("user")
+}
+
+model Session {
+  id        String   @id
+  expiresAt DateTime
+  token     String
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+  ipAddress String?
+  userAgent String?
+  userId    String
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([token])
+  @@index([userId])
+  @@map("session")
+}
+
+model Account {
+  id                    String    @id
+  accountId             String
+  providerId            String
+  userId                String
+  user                  User      @relation(fields: [userId], references: [id], onDelete: Cascade)
+  accessToken           String?
+  refreshToken          String?
+  idToken               String?
+  accessTokenExpiresAt  DateTime?
+  refreshTokenExpiresAt DateTime?
+  scope                 String?
+  password              String?
+  createdAt             DateTime  @default(now())
+  updatedAt             DateTime  @updatedAt
+
+  @@index([userId])
+  @@map("account")
+}
+
+model Verification {
+  id         String   @id
+  identifier String
+  value      String
+  expiresAt  DateTime
+  createdAt  DateTime @default(now())
+  updatedAt  DateTime @updatedAt
+
+  @@index([identifier])
+  @@map("verification")
 }

src/app/(features)/memorize/Memorize.tsx

@@ -1,13 +1,13 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useState } from "react";
 import LightButton from "@/components/buttons/LightButton";
 import { useAudioPlayer } from "@/hooks/useAudioPlayer";
 import { getTTSAudioUrl } from "@/lib/browser/tts";
 import { VOICES } from "@/config/locales";
 import { useTranslations } from "next-intl";
 import localFont from "next/font/local";
-import { isNonNegativeInteger } from "@/lib/utils";
+import { isNonNegativeInteger, SeededRandom } from "@/lib/utils";
 import { Pair } from "../../../../generated/prisma/browser";
 
 const myFont = localFont({
@@ -27,20 +27,16 @@ const Memorize: React.FC<MemorizeProps> = ({ textPairs }) => {
   const [show, setShow] = useState<"question" | "answer">("question");
   const { load, play } = useAudioPlayer();
 
-  const [disorderedTextPairs, setDisorderedTextPairs] = useState<Pair[]>(
-    [],
-  );
-
-  useEffect(() => {
-    setDisorderedTextPairs(textPairs.toSorted(() => Math.random() - 0.5));
-  }, [textPairs]);
-
-  const getTextPairs = () => {
-    if (disorder) {
-      return disorderedTextPairs;
+  if (textPairs.length === 0) {
+    return <p>{t("noTextPairs")}</p>;
   }
-    return textPairs.toSorted((a, b) => a.id - b.id);
-  };
+
+  const rng = new SeededRandom(textPairs[0].folderId);
+  const disorderedTextPairs = textPairs.toSorted(() => rng.next() - 0.5);
+
+  textPairs.sort((a, b) => a.id - b.id);
+
+  const getTextPairs = () => disorder ? disorderedTextPairs : textPairs;
 
   return (
     <>

src/app/(features)/memorize/page.tsx

@@ -1,51 +1,51 @@
-"use server";
-
 import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import {
   getFoldersWithTotalPairsByUserId,
   getUserIdByFolderId,
-} from "@/lib/actions/services/folderService";
+} from "@/lib/server/services/folderService";
 import { isNonNegativeInteger } from "@/lib/utils";
 import FolderSelector from "./FolderSelector";
 import Memorize from "./Memorize";
-import { getPairsByFolderId } from "@/lib/actions/services/pairService";
+import { getPairsByFolderId } from "@/lib/server/services/pairService";
 import { auth } from "@/auth";
+import { headers } from "next/headers";
 
 export default async function MemorizePage({
   searchParams,
 }: {
-  searchParams: Promise<{ folder_id?: string }>;
+  searchParams: Promise<{ folder_id?: string; }>;
 }) {
-  const session = await auth();
-  const userId = session?.user?.id;
+  const session = await auth.api.getSession({ headers: await headers() });
+  const tParam = (await searchParams).folder_id;
+
+  if (!session) {
+    redirect(
+      `/login?redirect=/memorize${(await searchParams).folder_id
+        ? `?folder_id=${tParam}`
+        : ""
+      }`,
+    );
+  }
+
   const t = await getTranslations("memorize.page");
 
-  const tParam = (await searchParams).folder_id;
   const folder_id = tParam
     ? isNonNegativeInteger(tParam)
       ? parseInt(tParam)
       : null
     : null;
 
-  if (!userId) {
-    redirect(
-      `/login?redirect=/memorize${folder_id ? `?folder_id=${folder_id}` : ""}`,
-    );
-  }
-
-  const uid = Number(userId);
-
   if (!folder_id) {
     return (
       <FolderSelector
-        folders={await getFoldersWithTotalPairsByUserId(uid)}
+        folders={await getFoldersWithTotalPairsByUserId(session.user.id)}
       />
     );
   }
 
   const owner = await getUserIdByFolderId(folder_id);
-  if (owner !== uid) {
+  if (owner !== session.user.id) {
     return <p>{t("unauthorized")}</p>;
   }
 

src/app/(features)/srt-player/VideoPlayer/VideoPanel.tsx

@@ -1,4 +1,4 @@
-import { useState, useRef, forwardRef, useEffect } from "react";
+import { useState, useRef, forwardRef, useEffect, useCallback } from "react";
 import SubtitleDisplay from "./SubtitleDisplay";
 import LightButton from "@/components/buttons/LightButton";
 import { getIndex, parseSrt, getNearistIndex } from "../subtitle";
@@ -20,7 +20,7 @@ const VideoPanel = forwardRef<HTMLVideoElement, VideoPanelProps>(
     const [spanText, setSpanText] = useState<string>("");
     const [subtitle, setSubtitle] = useState<string>("");
     const parsedSrtRef = useRef<
-      { start: number; end: number; text: string }[] | null
+      { start: number; end: number; text: string; }[] | null
     >(null);
     const rafldRef = useRef<number>(0);
     const ready = useRef({
@@ -31,7 +31,7 @@ const VideoPanel = forwardRef<HTMLVideoElement, VideoPanelProps>(
       },
     });
 
-    const togglePlayPause = () => {
+    const togglePlayPause = useCallback(() => {
       if (!videoUrl) return;
 
       const video = videoRef.current;
@@ -42,7 +42,7 @@ const VideoPanel = forwardRef<HTMLVideoElement, VideoPanelProps>(
         video.pause();
       }
       setIsPlaying(!video.paused);
-    }
+    }, [videoRef, videoUrl]);
 
     useEffect(() => {
       const handleKeyDownEvent = (e: globalThis.KeyboardEvent) => {

src/app/(features)/text-speaker/page.tsx

@@ -16,7 +16,7 @@ import { VOICES } from "@/config/locales";
 import { useTranslations } from "next-intl";
 import { getLocalStorageOperator } from "@/lib/browser/localStorageOperators";
 import { getTTSAudioUrl } from "@/lib/browser/tts";
-import { genIPA, genLocale } from "@/lib/actions/translatorActions";
+import { genIPA, genLocale } from "@/lib/server/translatorActions";
 
 export default function TextSpeakerPage() {
   const t = useTranslations("text_speaker");

src/app/(features)/translator/AddToFolder.tsx

@@ -1,15 +1,17 @@
+"use client";
+
 import LightButton from "@/components/buttons/LightButton";
 import Container from "@/components/cards/Container";
 import { TranslationHistorySchema } from "@/lib/interfaces";
-import { useSession } from "next-auth/react";
 import { Dispatch, useEffect, useState } from "react";
 import z from "zod";
 import { Folder } from "../../../../generated/prisma/browser";
-import { getFoldersByUserId } from "@/lib/actions/services/folderService";
+import { getFoldersByUserId } from "@/lib/server/services/folderService";
 import { Folder as Fd } from "lucide-react";
-import { createPair } from "@/lib/actions/services/pairService";
+import { createPair } from "@/lib/server/services/pairService";
 import { toast } from "sonner";
 import { useTranslations } from "next-intl";
+import { authClient } from "@/lib/auth-client";
 
 interface AddToFolderProps {
   item: z.infer<typeof TranslationHistorySchema>;
@@ -17,19 +19,21 @@ interface AddToFolderProps {
 }
 
 const AddToFolder: React.FC<AddToFolderProps> = ({ item, setShow }) => {
-  const session = useSession();
+  const { data: session } = authClient.useSession();
   const [folders, setFolders] = useState<Folder[]>([]);
   const t = useTranslations("translator.add_to_folder");
   const [loading, setLoading] = useState(true);
 
   useEffect(() => {
-    const userId = Number(session.data!.user!.id);
+    if (!session) return;
+    const userId = session.user.id;
     getFoldersByUserId(userId)
       .then(setFolders)
       .then(() => setLoading(false));
-  }, [session.data]);
+  }, [session]);
 
-  if (session.status !== "authenticated") {
+
+  if (!session) {
     return (
       <div className="fixed left-0 top-0 z-50 w-screen h-screen bg-black/50 flex justify-center items-center">
         <Container className="p-6">

src/app/(features)/translator/FolderSelector.tsx

@@ -1,13 +1,13 @@
 import Container from "@/components/cards/Container";
 import { useEffect, useState } from "react";
 import { Folder } from "../../../../generated/prisma/browser";
-import { getFoldersByUserId } from "@/lib/actions/services/folderService";
+import { getFoldersByUserId } from "@/lib/server/services/folderService";
 import LightButton from "@/components/buttons/LightButton";
 import { Folder as Fd } from "lucide-react";
 
 interface FolderSelectorProps {
   setSelectedFolderId: (id: number) => void;
-  userId: number;
+  userId: string;
   cancel: () => void;
 }
 

src/app/(features)/translator/page.tsx

@@ -10,25 +10,23 @@ import { tlsoPush, tlso } from "@/lib/browser/localStorageOperators";
 import { getTTSAudioUrl } from "@/lib/browser/tts";
 import { Plus, Trash } from "lucide-react";
 import { useTranslations } from "next-intl";
-import { useRef, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import z from "zod";
 import AddToFolder from "./AddToFolder";
 import {
   genIPA,
   genLocale,
   genTranslation,
-} from "@/lib/actions/translatorActions";
+} from "@/lib/server/translatorActions";
 import { toast } from "sonner";
 import FolderSelector from "./FolderSelector";
-import { useSession } from "next-auth/react";
-import { createPair } from "@/lib/actions/services/pairService";
+import { createPair } from "@/lib/server/services/pairService";
 import { shallowEqual } from "@/lib/utils";
+import { authClient } from "@/lib/auth-client";
 
 export default function TranslatorPage() {
   const t = useTranslations("translator");
 
-  const session = useSession();
-
   const taref = useRef<HTMLTextAreaElement>(null);
   const [lang, setLang] = useState<string>("chinese");
   const [tresult, setTresult] = useState<string>("");
@@ -38,7 +36,7 @@ export default function TranslatorPage() {
   const { load, play } = useAudioPlayer();
   const [history, setHistory] = useState<
     z.infer<typeof TranslationHistorySchema>[]
-  >(tlso.get());
+  >([]);
   const [showAddToFolder, setShowAddToFolder] = useState(false);
   const [addToFolderItem, setAddToFolderItem] = useState<z.infer<
     typeof TranslationHistorySchema
@@ -49,6 +47,11 @@ export default function TranslatorPage() {
   });
   const [autoSave, setAutoSave] = useState(false);
   const [autoSaveFolderId, setAutoSaveFolderId] = useState<number | null>(null);
+  const { data: session } = authClient.useSession();
+
+  useEffect(() => {
+    setHistory(tlso.get());
+  }, []);
 
   const tts = async (text: string, locale: string) => {
     if (lastTTS.current.text !== text) {
@@ -306,7 +309,7 @@ export default function TranslatorPage() {
             checked={autoSave}
             onChange={(e) => {
               const checked = e.target.checked;
-              if (checked === true && !(session.status === "authenticated")) {
+              if (checked === true && !session) {
                 toast.warning("Please login to enable auto-save");
                 return;
               }
@@ -364,7 +367,7 @@ export default function TranslatorPage() {
           )}
           {autoSave && !autoSaveFolderId && (
             <FolderSelector
-              userId={Number(session.data!.user!.id)}
+              userId={session!.user.id as string}
               cancel={() => setAutoSave(false)}
               setSelectedFolderId={(id) => setAutoSaveFolderId(id)}
             />

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

@@ -0,0 +1,4 @@
+import { auth } from "@/auth";
+import { toNextJsHandler } from "better-auth/next-js";
+
+export const { POST, GET } = toNextJsHandler(auth);

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

@@ -1,3 +0,0 @@
-import { handlers } from "../../../../auth";
-
-export const { GET, POST } = handlers;

src/app/folders/FoldersClient.tsx

@@ -16,7 +16,7 @@ import {
   deleteFolderById,
   getFoldersWithTotalPairsByUserId,
   renameFolderById,
-} from "@/lib/actions/services/folderService";
+} from "@/lib/server/services/folderService";
 import { useTranslations } from "next-intl";
 import { toast } from "sonner";
 
@@ -85,7 +85,7 @@ const FolderCard = ({ folder, refresh }: FolderProps) => {
   );
 };
 
-export default function FoldersClient({ userId }: { userId: number }) {
+export default function FoldersClient({ userId }: { userId: string }) {
   const t = useTranslations("folders");
   const [folders, setFolders] = useState<(Folder & { total: number })[]>(
     [],

src/app/folders/[folder_id]/InFolder.tsx

@@ -9,7 +9,7 @@ import {
   createPair,
   deletePairById,
   getPairsByFolderId,
-} from "@/lib/actions/services/pairService";
+} from "@/lib/server/services/pairService";
 import AddTextPairModal from "./AddTextPairModal";
 import TextPairCard from "./TextPairCard";
 import LightButton from "@/components/buttons/LightButton";

src/app/folders/[folder_id]/TextPairCard.tsx

@@ -1,6 +1,6 @@
 import { Edit, Trash2 } from "lucide-react";
 import { TextPair } from "./InFolder";
-import { updatePairById } from "@/lib/actions/services/pairService";
+import { updatePairById } from "@/lib/server/services/pairService";
 import { useState } from "react";
 import UpdateTextPairModal from "./UpdateTextPairModal";
 import { useTranslations } from "next-intl";

src/app/folders/[folder_id]/page.tsx

@@ -1,22 +1,23 @@
 import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import InFolder from "./InFolder";
-import { getUserIdByFolderId } from "@/lib/actions/services/folderService";
+import { getUserIdByFolderId } from "@/lib/server/services/folderService";
 import { auth } from "@/auth";
+import { headers } from "next/headers";
 export default async function FoldersPage({
   params,
 }: {
-  params: Promise<{ folder_id: number }>;
+  params: Promise<{ folder_id: number; }>;
 }) {
-  const session = await auth();
+  const session = await auth.api.getSession({ headers: await headers() });
   const { folder_id } = await params;
   const t = await getTranslations("folder_id");
 
   if (!folder_id) {
     redirect("/folders");
   }
-  if (!session?.user?.id) redirect(`/login?redirect=/folders/${folder_id}`);
-  if ((await getUserIdByFolderId(Number(folder_id))) !== Number(session.user.id)) {
+  if (!session) redirect(`/login?redirect=/folders/${folder_id}`);
+  if ((await getUserIdByFolderId(Number(folder_id))) !== session.user.id) {
     return <p>{t("unauthorized")}</p>;
   }
   return <InFolder folderId={Number(folder_id)} />;

src/app/folders/page.tsx

@@ -1,8 +1,12 @@
 import { auth } from "@/auth";
 import FoldersClient from "./FoldersClient";
 import { redirect } from "next/navigation";
+import { headers } from "next/headers";
+
 export default async function FoldersPage() {
-  const session = await auth();
-  if (!session?.user?.id) redirect(`/login?redirect=/folders`);
-  return <FoldersClient userId={Number(session.user.id)} />;
+  const session = await auth.api.getSession(
+    { headers: await headers() }
+  );
+  if (!session) redirect(`/signin?redirect=/folders`);
+  return <FoldersClient userId={session.user.id} />;
 }

src/app/layout.tsx

@@ -2,7 +2,6 @@ import type { Metadata } from "next";
 import "./globals.css";
 import type { Viewport } from "next";
 import { NextIntlClientProvider } from "next-intl";
-import SessionWrapper from "@/components/SessionWrapper";
 import { Navbar } from "@/components/Navbar";
 import { Toaster } from "sonner";
 
@@ -22,7 +21,6 @@ export default async function RootLayout({
   children: React.ReactNode;
 }>) {
   return (
-    <SessionWrapper>
     <html lang="en">
       <body className={`antialiased`}>
         <NextIntlClientProvider>
@@ -32,6 +30,5 @@ export default async function RootLayout({
         </NextIntlClientProvider>
       </body>
     </html>
-    </SessionWrapper>
   );
 }

src/app/login/page.tsx

@@ -1,44 +0,0 @@
-"use client";
-
-import LightButton from "@/components/buttons/LightButton";
-import { Center } from "@/components/Center";
-import IMAGES from "@/config/images";
-import { signIn, useSession } from "next-auth/react";
-import Image from "next/image";
-import { useRouter, useSearchParams } from "next/navigation";
-import { useEffect } from "react";
-import { useTranslations } from "next-intl";
-
-export default function LoginPage() {
-  const session = useSession();
-  const router = useRouter();
-  const searchParams = useSearchParams();
-  const t = useTranslations("login");
-
-  useEffect(() => {
-    if (session.status === "authenticated") {
-      router.push(searchParams.get("redirect") || "/");
-    }
-  }, [session.status, router, searchParams]);
-
-  return (
-    <Center>
-      {session.status === "loading" ? (
-        <div>{t("loading")}</div>
-      ) : (
-        <LightButton
-          className="flex flex-row p-2 gap-2"
-          onClick={() => signIn("github")}
-        >
-          <Image
-            src={IMAGES.github_mark}
-            alt="GitHub Logo"
-            width={32}
-            height={32}
-          />
-          <span>{t("githubLogin")}</span>
-        </LightButton>
-      )}
-    </Center>
-  );
-}

src/app/page.tsx

@@ -1,26 +1,13 @@
-import { useTranslations } from "next-intl";
+import { getTranslations } from "next-intl/server";
 import Link from "next/link";
 
-export default function HomePage() {
-  const t = useTranslations("home");
-  function TopArea() {
-    return (
-      <div className="bg-[#35786f] text-white w-full min-h-[75dvh] flex justify-center items-center">
-        <div className="mb-16 mx-16 md:mx-0 md:max-w-[60dvw]">
-          <h1 className="text-6xl md:text-9xl mb-8 font-extrabold">
-            {t("title")}
-          </h1>
-          <p className="text-2xl md:text-5xl font-medium">{t("description")}</p>
-        </div>
-      </div>
-    );
-  }
 interface LinkAreaProps {
   href: string;
   name: string;
   description: string;
   color: string;
 }
+
 function LinkArea({ href, name, description, color }: LinkAreaProps) {
   return (
     <Link
@@ -35,10 +22,27 @@ export default function HomePage() {
     </Link>
   );
 }
-  function LinkGrid() {
+
+export default async function HomePage() {
+  const t = await getTranslations("home");
   return (
-      <div className="w-full grid grid-cols-1 grid-rows-6 md:grid-cols-3">
-        <LinkArea
+    <>
+      <div className="bg-[#35786f] text-white w-full min-h-[75dvh] flex justify-center items-center">
+        <div className="mb-16 mx-16 md:mx-0 md:max-w-[60dvw]">
+          <h1 className="text-6xl md:text-9xl mb-8 font-extrabold">
+            {t("title")}
+          </h1>
+          <p className="text-2xl md:text-5xl font-medium">{t("description")}</p>
+        </div>
+      </div>
+      <div className="w-full flex justify-center font-serif items-center flex-col min-h-64 h-[25vdh]">
+        <p className="text-3xl">{t("fortune.quote")}</p>
+        <cite className="text-[#e9b353] text-xl">{t("fortune.author")}</cite>
+      </div>
+      <div className="bg-[#bbbbbb] w-full flex justify-center items-center flex-col h-32">
+        <div className="w-0 h-0 border-l-40 border-r-40 border-t-30 border-l-transparent border-r-transparent border-t-white"></div>
+      </div>
+      <div className="w-full grid grid-cols-1 grid-rows-6 md:grid-cols-3"><LinkArea
         href="/translator"
         name={t("translator.name")}
         description={t("translator.description")}
@@ -75,29 +79,6 @@ export default function HomePage() {
           color="#cab48a"
         ></LinkArea>
       </div>
-    );
-  }
-  function Fortune() {
-    return (
-      <div className="w-full flex justify-center font-serif items-center flex-col min-h-64 h-[25vdh]">
-        <p className="text-3xl">{t("fortune.quote")}</p>
-        <cite className="text-[#e9b353] text-xl">{t("fortune.author")}</cite>
-      </div>
-    );
-  }
-  function Explore() {
-    return (
-      <div className="bg-[#bbbbbb] w-full flex justify-center items-center flex-col h-32">
-        <div className="w-0 h-0 border-l-40 border-r-40 border-t-30 border-l-transparent border-r-transparent border-t-white"></div>
-      </div>
-    );
-  }
-  return (
-    <>
-      <TopArea></TopArea>
-      <Fortune></Fortune>
-      <Explore></Explore>
-      <LinkGrid></LinkGrid>
     </>
   );
 }

src/app/profile/LogoutButton.tsx

@@ -0,0 +1,20 @@
+"use client";
+
+import LightButton from "@/components/buttons/LightButton";
+import { authClient } from "@/lib/auth-client";
+import { useTranslations } from "next-intl";
+import { useRouter } from "next/navigation";
+
+export default function LogoutButton() {
+    const t = useTranslations("profile");
+    const router = useRouter();
+    return <LightButton onClick={async () => {
+        authClient.signOut({
+            fetchOptions: {
+                onSuccess: () => {
+                    router.push("/login?redirect=/profile");
+                }
+            }
+        });
+    }}> {t("logout")}</LightButton >;
+}

src/app/profile/page.tsx

@@ -1,43 +1,40 @@
-"use client";
-
-import { signOut, useSession } from "next-auth/react";
-import { usePathname, useRouter } from "next/navigation";
 import Image from "next/image";
-import { useEffect } from "react";
 import { Center } from "@/components/Center";
 import Container from "@/components/cards/Container";
-import LightButton from "@/components/buttons/LightButton";
-import { useTranslations } from "next-intl";
+import { auth } from "@/auth";
+import { getTranslations } from "next-intl/server";
+import { redirect } from "next/navigation";
+import { headers } from "next/headers";
+import LogoutButton from "./LogoutButton";
 
-export default function MePage() {
-  const session = useSession();
-  const router = useRouter();
-  const pathname = usePathname();
-  const t = useTranslations("profile");
+export default async function ProfilePage() {
+  const t = await getTranslations("profile");
 
-  useEffect(() => {
-    if (session.status !== "authenticated") {
-      router.push(`/login?redirect=${encodeURIComponent(pathname)}`);
+  const session = await auth.api.getSession({ headers: await headers() });
+
+  if (!session) {
+    redirect("/signin?redirect=/profile");
   }
-  }, [session.status, router, pathname]);
+
+  console.log(JSON.stringify(session, null, 2));
 
   return (
     <Center>
       <Container className="p-6">
         <h1>{t("myProfile")}</h1>
-        {(session.data?.user?.image as string) && (
+        {(session.user.image) && (
           <Image
             width={64}
             height={64}
             alt="User Avatar"
-            src={session.data?.user?.image as string}
+            src={session.user.image as string}
             className="rounded-4xl"
           ></Image>
         )}
-        <p>{session.data?.user?.name}</p>
-        <p>{t("email", { email: session.data!.user!.email as string })}</p>
-        <LightButton onClick={signOut}>{t("logout")}</LightButton>
+        <p>{session.user.name}</p>
+        <p>{t("email", { email: session.user.email })}</p>
+        <LogoutButton />
       </Container>
     </Center>
   );
-}
+};

src/app/signin/page.tsx

@@ -0,0 +1,23 @@
+import LightButton from "@/components/buttons/LightButton";
+import { signInAction } from "@/lib/actions/auth";
+import Link from "next/link";
+
+export default function SignInPage() {
+    return (
+        <div>
+            <h1>Sign In</h1>
+            <form action={signInAction}>
+                <input type="email" 
+                name="email" 
+                placeholder="Email" 
+                required />
+                <input type="password"
+                name="password"
+                placeholder="Password"
+                required />
+                <LightButton type="submit">Sign In</LightButton>
+            </form>
+            <Link href={"/signup"}>Do not have an account? Sign up!</Link>
+        </div>
+    );
+}

src/app/signup/page.tsx

@@ -0,0 +1,33 @@
+"use client";
+
+import LightButton from "@/components/buttons/LightButton";
+import { signUpAction } from "@/lib/actions/auth";
+import Link from "next/link";
+
+export default function SignInPage() {
+    return (
+        <div>
+            <h1>Sign Up</h1>
+            <form action={signUpAction}>
+                <input type="text"
+                    name="name"
+                    placeholder="Name"
+                    required
+                />
+                <input type="email"
+                    name="email"
+                    placeholder="Email"
+                    required
+                />
+                <input type="password"
+                    name="password"
+                    placeholder="Password"
+                    required
+                />
+                <LightButton type="submit">Sign Up</LightButton>
+            </form>
+
+            <Link href={"/signin"}>Already have an account? Sign in!</Link>
+        </div>
+    );
+}

src/auth.ts

@@ -1,30 +1,20 @@
-import NextAuth from "next-auth";
-import GitHub from "next-auth/providers/github";
-import { createUserIfNotExists, getUserIdByEmail } from "./lib/actions/services/userService";
+import { betterAuth } from "better-auth";
+import { prismaAdapter } from "better-auth/adapters/prisma";
+import { nextCookies } from "better-auth/next-js";
+import prisma from "./lib/db";
 
-export const { handlers, auth, signIn, signOut } = NextAuth({
-    providers: [
-        GitHub({
-            clientId: process.env.GITHUB_CLIENT_ID!,
-            clientSecret: process.env.GITHUB_CLIENT_SECRET!,
+export const auth = betterAuth({
+    database: prismaAdapter(prisma, {
+        provider: "postgresql"
     }),
-    ],
-
-    callbacks: {
-        async signIn({ user }) {
-            if (!user.email) return false;
-            await createUserIfNotExists(user.email, user.name);
-            return true
+    emailAndPassword: {
+        enabled: true
     },
-        async session({ session }) {
-            if (session.user?.email) {
-                const userId = await getUserIdByEmail(session.user.email);
-
-                if (userId) {
-                    session.user.id = userId.toString();
-                }
-            }
-            return session;
+    socialProviders: {
+        github: {
+            clientId: process.env.GITHUB_CLIENT_ID as string,
+            clientSecret: process.env.GITHUB_CLIENT_SECRET as string
         },
     },
+    plugins: [nextCookies()]
 });

src/components/LanguageSettings.tsx

@@ -0,0 +1,46 @@
+"use client";
+
+import IMAGES from "@/config/images";
+import IconClick from "./IconClick";
+import { useState } from "react";
+import LightButton from "./buttons/LightButton";
+
+export default function LanguageSettings() {
+    const [showLanguageMenu, setShowLanguageMenu] = useState(false);
+    const handleLanguageClick = () => {
+        setShowLanguageMenu((prev) => !prev);
+    };
+    const setLocale = async (locale: string) => {
+        document.cookie = `locale=${locale}`;
+        window.location.reload();
+    };
+    return (
+        <>
+            <IconClick
+                src={IMAGES.language_white}
+                alt="language"
+                disableOnHoverBgChange={true}
+                onClick={handleLanguageClick}
+            ></IconClick>
+            <div className="relative">
+                {showLanguageMenu && (
+                    <div>
+                        <div className="absolute top-10 right-0 rounded-md shadow-md flex flex-col gap-2">
+                            <LightButton
+                                className="w-full"
+                                onClick={() => setLocale("en-US")}
+                            >
+                                English
+                            </LightButton>
+                            <LightButton
+                                className="w-full"
+                                onClick={() => setLocale("zh-CN")}
+                            >
+                                中文
+                            </LightButton>
+                        </div>
+                    </div>
+                )}
+            </div></>
+    );
+}

src/components/Navbar.tsx

@@ -1,26 +1,18 @@
-"use client";
-
 import Link from "next/link";
 import Image from "next/image";
-import { useTranslations } from "next-intl";
-import IconClick from "./IconClick";
 import IMAGES from "@/config/images";
-import { useState } from "react";
-import LightButton from "./buttons/LightButton";
-import { useSession } from "next-auth/react";
-import { Folder, Home, LoaderCircle } from "lucide-react";
+import { Folder, Home } from "lucide-react";
+import LanguageSettings from "./LanguageSettings";
+import { auth } from "@/auth";
+import { headers } from "next/headers";
+import { getTranslations } from "next-intl/server";
+
+export async function Navbar() {
+  const t = await getTranslations("navbar");
+  const session = await auth.api.getSession({
+    headers: await headers()
+  });
 
-export function Navbar() {
-  const t = useTranslations("navbar");
-  const [showLanguageMenu, setShowLanguageMenu] = useState(false);
-  const handleLanguageClick = () => {
-    setShowLanguageMenu((prev) => !prev);
-  };
-  const setLocale = async (locale: string) => {
-    document.cookie = `locale=${locale}`;
-    window.location.reload();
-  };
-  const session = useSession();
   return (
     <div className="flex justify-between items-center w-full h-16 px-8 bg-[#35786f] text-white">
       <Link href={"/"} className="text-xl border-b hidden md:block">
@@ -41,47 +33,21 @@ export function Navbar() {
             height={24}
           />
         </Link>
-        <div className="relative">
-          {showLanguageMenu && (
-            <div>
-              <div className="absolute top-10 right-0 rounded-md shadow-md flex flex-col gap-2">
-                <LightButton
-                  className="w-full"
-                  onClick={() => setLocale("en-US")}
-                >
-                  English
-                </LightButton>
-                <LightButton
-                  className="w-full"
-                  onClick={() => setLocale("zh-CN")}
-                >
-                  中文
-                </LightButton>
-              </div>
-            </div>
-          )}
-          <IconClick
-            src={IMAGES.language_white}
-            alt="language"
-            disableOnHoverBgChange={true}
-            onClick={handleLanguageClick}
-          ></IconClick>
-        </div>
+        <LanguageSettings />
         <Link href="/folders" className="md:block hidden">
           {t("folders")}
         </Link>
         <Link href="/folders" className="md:hidden block">
           <Folder />
         </Link>
-        {session?.status === "authenticated" && (
-          <div className="flex gap-2">
+        {
+          (() => {
+            return session &&
               <Link href="/profile">{t("profile")}</Link>
-          </div>
-        )}
-        {session?.status === "unauthenticated" && (
-          <Link href="/login">{t("login")}</Link>
-        )}
-        {session?.status === "loading" && <LoaderCircle />}
+              || <Link href="/signin">{t("sign_in")}</Link>;
+
+          })()
+        }
         <Link href="/changelog.txt">{t("about")}</Link>
         <Link
           className="hidden md:block"

src/components/SessionWrapper.tsx

@@ -1,11 +0,0 @@
-"use client";
-
-import { SessionProvider } from "next-auth/react";
-
-export default function SessionWrapper({
-  children,
-}: {
-  children: React.ReactNode;
-}) {
-  return <SessionProvider>{children}</SessionProvider>;
-}

src/components/cards/Container.tsx

@@ -1,5 +1,3 @@
-"use client";
-
 interface ContainerProps {
   children?: React.ReactNode;
   className?: string;

src/lib/actions/auth.ts

@@ -0,0 +1,43 @@
+"use server";
+
+import { auth } from "@/auth";
+import { headers } from "next/headers";
+import { redirect } from "next/navigation";
+
+export async function signUpAction(formData: FormData) {
+    const email = formData.get("email") as string;
+    const name = formData.get("name") as string;
+    const password = formData.get("password") as string;
+
+    await auth.api.signUpEmail({
+        body: {
+            email,
+            password,
+            name
+        }
+    });
+
+    redirect("/");
+}
+
+export async function signInAction(formData: FormData) {
+    const email = formData.get("email") as string;
+    const password = formData.get("password") as string;
+
+    await auth.api.signInEmail({
+        body: {
+            email,
+            password,
+        }
+    });
+
+    redirect("/");
+}
+
+export async function signOutAction() {
+    await auth.api.signOut({
+        headers: await headers()
+    });
+
+    redirect("/login");
+}

src/lib/auth-client.ts

@@ -0,0 +1,5 @@
+import { createAuthClient } from "better-auth/react";
+
+export const authClient = createAuthClient({
+    baseURL: process.env.BETTER_AUTH_URL as string
+});

src/lib/browser/localStorageOperators.ts

@@ -1,3 +1,5 @@
+"use client";
+
 import {
   TranslationHistoryArraySchema,
   TranslationHistorySchema,
@@ -14,7 +16,7 @@ export const getLocalStorageOperator = <T extends z.ZodTypeAny>(
       try {
         const item = globalThis.localStorage.getItem(key);
 
-        if (!item) return [];
+        if (!item) return [] as z.infer<T>;
 
         const rawData = JSON.parse(item) as z.infer<T>;
         const result = schema.safeParse(rawData);
@@ -26,11 +28,11 @@ export const getLocalStorageOperator = <T extends z.ZodTypeAny>(
             "Invalid data structure in localStorage:",
             result.error,
           );
-          return [];
+          return [] as z.infer<T>;
         }
       } catch (e) {
         console.error(`Failed to parse ${key} data:`, e);
-        return [];
+        return [] as z.infer<T>;
       }
     },
     set: (data: z.infer<T>) => {

src/lib/server/services/folderService.ts

@@ -3,7 +3,7 @@
 import { FolderCreateInput, FolderUpdateInput } from "../../../../generated/prisma/models";
 import prisma from "../../db";
 
-export async function getFoldersByUserId(userId: number) {
+export async function getFoldersByUserId(userId: string) {
   const folders = await prisma.folder.findMany({
     where: {
       userId: userId,
@@ -23,7 +23,7 @@ export async function renameFolderById(id: number, newName: string) {
   });
 }
 
-export async function getFoldersWithTotalPairsByUserId(userId: number) {
+export async function getFoldersWithTotalPairsByUserId(userId: string) {
   const folders = await prisma.folder.findMany({
     where: { userId },
     include: {

src/lib/utils.ts

@@ -20,3 +20,130 @@ export function shallowEqual<T extends object>(obj1: T, obj2: T): boolean {
   
   return true;
 }
+export class SeededRandom {
+  private seed: number;
+  private readonly m: number = 0x80000000; // 2^31
+  private readonly a: number = 1103515245;
+  private readonly c: number = 12345;
+
+  constructor(seed?: number) {
+    this.seed = seed || Date.now();
+  }
+
+  /**
+   * 生成0-1之间的随机数
+   * @returns 0到1之间的随机浮点数
+   */
+  next(): number {
+    this.seed = (this.a * this.seed + this.c) % this.m;
+    return this.seed / (this.m - 1);
+  }
+
+  /**
+   * 生成指定范围的随机整数
+   * @param min 最小值（包含）
+   * @param max 最大值（包含）
+   * @returns [min, max] 范围内的随机整数
+   */
+  nextInt(min: number, max: number): number {
+    if (min > max) {
+      throw new Error('min must be less than or equal to max');
+    }
+    return Math.floor(this.next() * (max - min + 1)) + min;
+  }
+
+  /**
+   * 生成指定范围的随机浮点数
+   * @param min 最小值（包含）
+   * @param max 最大值（不包含）
+   * @returns [min, max) 范围内的随机浮点数
+   */
+  nextFloat(min: number, max: number): number {
+    if (min >= max) {
+      throw new Error('min must be less than max');
+    }
+    return this.next() * (max - min) + min;
+  }
+
+  /**
+   * 生成固定长度的随机数序列
+   * @param length 序列长度
+   * @param min 最小值
+   * @param max 最大值
+   * @param type 生成类型：'integer' 或 'float'
+   * @returns 随机数数组
+   */
+  generateSequence(
+    length: number,
+    min: number = 0,
+    max: number = 1,
+    type: 'integer' | 'float' = 'integer'
+  ): number[] {
+    const sequence: number[] = [];
+
+    for (let i = 0; i < length; i++) {
+      if (type === 'integer') {
+        sequence.push(this.nextInt(min, max));
+      } else {
+        sequence.push(this.nextFloat(min, max));
+      }
+    }
+
+    return sequence;
+  }
+
+  /**
+   * 重置种子
+   * @param newSeed 新的种子值
+   */
+  reset(newSeed?: number): void {
+    this.seed = newSeed || Date.now();
+  }
+
+  /**
+   * 获取当前种子值
+   * @returns 当前种子
+   */
+  getSeed(): number {
+    return this.seed;
+  }
+
+  /**
+   * 生成随机布尔值
+   * @param probability 为 true 的概率，默认 0.5
+   * @returns 随机布尔值
+   */
+  nextBoolean(probability: number = 0.5): boolean {
+    if (probability < 0 || probability > 1) {
+      throw new Error('probability must be between 0 and 1');
+    }
+    return this.next() < probability;
+  }
+
+  /**
+   * 从数组中随机选择元素
+   * @param array 源数组
+   * @returns 随机选择的元素
+   */
+  choice<T>(array: T[]): T {
+    if (array.length === 0) {
+      throw new Error('array cannot be empty');
+    }
+    const index = this.nextInt(0, array.length - 1);
+    return array[index];
+  }
+
+  /**
+   * 打乱数组（Fisher-Yates 洗牌算法）
+   * @param array 要打乱的数组
+   * @returns 打乱后的新数组
+   */
+  shuffle<T>(array: T[]): T[] {
+    const shuffled = [...array];
+    for (let i = shuffled.length - 1; i > 0; i--) {
+      const j = this.nextInt(0, i);
+      [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
+    }
+    return shuffled;
+  }
+}