diff --git a/final_project/index.js b/final_project/index.js
index b890c1d380..1d2cbae67e 100644
--- a/final_project/index.js
+++ b/final_project/index.js
@@ -12,6 +12,28 @@ app.use("/customer",session({secret:"fingerprint_customer",resave: true, saveUni
 
 app.use("/customer/auth/*", function auth(req,res,next){
 //Write the authenication mechanism here
+// セッションが存在するかチェック
+if (!req.session || !req.session.authorization) {
+    return res.status(401).json({ message: "Unauthorized. Please login first" });
+  }
+  
+  try {
+    // JWTトークンを検証
+    const token = req.session.authorization.accessToken;
+    
+    // トークンを検証（'access'はJWTの署名に使用した秘密鍵）
+    jwt.verify(token, 'access', (err, decoded) => {
+      if (err) {
+        // トークンが無効または期限切れの場合
+        return res.status(401).json({ message: "Invalid token. Please login again" });
+      }
+      
+      // トークンが有効な場合、次のミドルウェアに進む
+      next();
+    });
+  } catch (err) {
+    return res.status(500).json({ message: "Internal server error during authentication" });
+  }
 });
  
 const PORT =5000;
diff --git a/final_project/router/auth_users.js b/final_project/router/auth_users.js
index 8cb6ef6e40..92e01a0175 100644
--- a/final_project/router/auth_users.js
+++ b/final_project/router/auth_users.js
@@ -5,24 +5,135 @@ const regd_users = express.Router();
 
 let users = [];
 
-const isValid = (username)=>{ //returns boolean
-//write code to check is the username is valid
+const isValid = (username) => { //returns boolean
+    // ユーザー名が有効かチェック（ここでは単純に存在チェック）
+    return username !== undefined && username.trim() !== '';
 }
 
-const authenticatedUser = (username,password)=>{ //returns boolean
-//write code to check if username and password match the one we have in records.
+const authenticatedUser = (username, password) => { //returns boolean
+// 指定されたユーザー名とパスワードが一致するユーザーを検索
+    const user = users.find(user => user.username === username && user.password === password);
+    return user !== undefined;
 }
 
 //only registered users can login
-regd_users.post("/login", (req,res) => {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
+regd_users.post("/login", (req, res) => {
+    // リクエストボディからユーザー名とパスワードを取得
+    const username = req.body.username;
+    const password = req.body.password;
+  
+    // ユーザー名またはパスワードが欠けている場合
+    if (!username || !password) {
+      return res.status(400).json({ message: "Username and password are required" });
+    }
+  
+    // ユーザー認証
+    if (authenticatedUser(username, password)) {
+      // JWT アクセストークンを生成
+      let accessToken = jwt.sign({
+        data: password
+      }, 'access', { expiresIn: 60 * 60 }); // 1時間有効
+  
+      // アクセストークンとユーザー名をセッションに保存
+      req.session.authorization = {
+        accessToken, 
+        username
+      };
+      
+      return res.status(200).json({ 
+        message: "User successfully logged in",
+        token: accessToken 
+      });
+    } else {
+      return res.status(401).json({ message: "Invalid Login. Check username and password" });
+    }
 });
 
+
+
+
+// Add a book review
 // Add a book review
 regd_users.put("/auth/review/:isbn", (req, res) => {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
+    // セッションから認証情報を確認
+    if (!req.session || !req.session.authorization) {
+      return res.status(401).json({ message: "Unauthorized. Please login first" });
+    }
+  
+    // ユーザー名をセッションから取得
+    const username = req.session.authorization.username;
+    
+    // ISBNをパラメータから取得
+    const isbn = req.params.isbn;
+    
+    // レビュー内容をリクエストクエリから取得
+    const review = req.query.review;
+    
+    // 必須パラメータのチェック
+    if (!review) {
+      return res.status(400).json({ message: "Review content is required" });
+    }
+    
+    // 指定したISBNの本が存在するかチェック
+    if (!books[isbn]) {
+      return res.status(404).json({ message: "Book not found with the given ISBN" });
+    }
+    
+    // レビューを追加または更新
+    // ユーザー名をキーとして、そのユーザーのレビューを保存
+    books[isbn].reviews[username] = review;
+    
+    // 成功レスポンスを返す
+    return res.status(200).json({ 
+      message: "Review added/updated successfully",
+      book: books[isbn].title,
+      user: username,
+      review: review
+    });
+});
+
+regd_users.delete("/auth/review/:isbn", (req, res) => {
+    // セッションから認証情報を確認
+    if (!req.session || !req.session.authorization) {
+      return res.status(401).json({ message: "Unauthorized. Please login first" });
+    }
+  
+    // ユーザー名をセッションから取得
+    const username = req.session.authorization.username;
+    
+    // ISBNをパラメータから取得
+    const isbn = req.params.isbn;
+    
+    // 指定したISBNの本が存在するかチェック
+    if (!books[isbn]) {
+      return res.status(404).json({ message: "Book not found with the given ISBN" });
+    }
+    
+    // 本のレビューオブジェクトを取得
+    const reviews = books[isbn].reviews;
+    
+    // レビューオブジェクトが存在するかチェック
+    if (!reviews) {
+      return res.status(404).json({ message: "No reviews exist for this book" });
+    }
+    
+    // 現在のユーザーのレビューが存在するかチェック
+    if (!reviews.hasOwnProperty(username)) {
+      return res.status(403).json({ 
+        message: "You don't have a review for this book or you're not authorized to delete other users' reviews" 
+      });
+    }
+    
+    // ユーザーのレビューを削除
+    delete reviews[username];
+    
+    // 成功レスポンスを返す
+    return res.status(200).json({ 
+      message: "Review deleted successfully",
+      book: books[isbn].title,
+      isbn: isbn,
+      review: books[isbn].reviews
+    });
 });
 
 module.exports.authenticated = regd_users;
diff --git a/final_project/router/general.js b/final_project/router/general.js
index 9eb0ac1a91..807e4748cc 100644
--- a/final_project/router/general.js
+++ b/final_project/router/general.js
@@ -7,37 +7,187 @@ const public_users = express.Router();
 
 public_users.post("/register", (req,res) => {
   //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
+  // リクエストボディからユーザー名とパスワードを取得
+  const { username, password } = req.body;
+
+  // ユーザー名とパスワードが提供されているかチェック
+  if (!username || !password) {
+    return res.status(400).json({ message: "Username and password are required" });
+  }
+
+  // ユーザー名が有効かチェック
+  if (!isValid(username)) {
+    return res.status(400).json({ message: "Invalid username" });
+  }
+
+  // ユーザー名が既に存在するかチェック
+  const userExists = users.some(user => user.username === username);
+  if (userExists) {
+    return res.status(409).json({ message: "Username already exists" });
+  }
+
+  // 新しいユーザーを追加
+  users.push({ username, password });
+
+  // 成功レスポンスを返す
+  return res.status(201).json({ message: "User registered successfully" });
+  //return res.status(300).json({message: "Yet to be implemented"});
 });
 
 // Get the book list available in the shop
-public_users.get('/',function (req, res) {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
+public_users.get('/', function (req, res) {
+  // create promise for getting books
+  const getBooksPromise = new Promise((resolve, reject) => {
+
+    setTimeout(() => {
+      if (books && Object.keys(books).length > 0) {
+        resolve(books);
+      } else {
+        reject("Books data not available");
+      }
+    }, 100);
+  });
+
+  // Process results using promises
+  getBooksPromise
+    .then((booksData) => {
+      res.status(200).json(booksData);
+    })
+    .catch((error) => {
+      res.status(500).json({ message: error });
+    });
 });
 
 // Get book details based on ISBN
-public_users.get('/isbn/:isbn',function (req, res) {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
- });
+public_users.get('/isbn/:isbn', function (req, res) {
+    const isbn = req.params.isbn;
+    
+    //  create promise for getting books with ISBN
+    const getBookByISBNPromise = new Promise((resolve, reject) => {
+      // Simulate Async
+      setTimeout(() => {
+        if (books[isbn]) {
+          resolve(books[isbn]);
+        } else {
+          reject("Book not found with the given ISBN");
+        }
+      }, 100);
+    });
+    
+    // Process results using promises
+    getBookByISBNPromise
+      .then((book) => {
+        res.status(200).json(book);
+      })
+      .catch((error) => {
+        res.status(404).json({ message: error });
+      });
+});
   
-// Get book details based on author
-public_users.get('/author/:author',function (req, res) {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
+// Get book details based on author using Promise
+public_users.get('/author/:author', function (req, res) {
+    const requestedAuthor = req.params.author;
+    
+    //  create promise for getting books with author
+    const getBooksByAuthorPromise = new Promise((resolve, reject) => {
+      // Simulate Async
+      setTimeout(() => {
+        const bookIds = Object.keys(books);
+        const authorBooks = [];
+        
+        // Check each book and add matching authors to the results array
+        bookIds.forEach(id => {
+          if (books[id] && books[id].author && 
+              books[id].author.toLowerCase() === requestedAuthor.toLowerCase()) {
+            authorBooks.push({
+              isbn: id,
+              title: books[id].title,
+              author: books[id].author,
+              reviews: books[id].reviews
+            });
+          }
+        });
+        
+        if (authorBooks.length > 0) {
+          resolve(authorBooks);
+        } else {
+          reject("No books found for this author");
+        }
+      }, 100);
+    });
+    
+    // Process results using promises
+    getBooksByAuthorPromise
+      .then((books) => {
+        res.status(200).json(books);
+      })
+      .catch((error) => {
+        res.status(404).json({ message: error });
+      });
 });
 
-// Get all books based on title
-public_users.get('/title/:title',function (req, res) {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
+// Get all books based on title using Promise
+public_users.get('/title/:title', function (req, res) {
+    const requestedTitle = req.params.title.toLowerCase();
+    
+    // Create a promise to search for books by title
+    const getBooksByTitlePromise = new Promise((resolve, reject) => {
+      // Simulate Async
+      setTimeout(() => {
+        const bookIds = Object.keys(books);
+        const matchingBooks = [];
+        
+        // Check each book and add the ones whose title contains the search term to the results array
+        bookIds.forEach(id => {
+          if (books[id] && books[id].title && 
+              books[id].title.toLowerCase().includes(requestedTitle)) {
+            matchingBooks.push({
+              isbn: id,
+              title: books[id].title,
+              author: books[id].author,
+              reviews: books[id].reviews
+            });
+          }
+        });
+        
+        if (matchingBooks.length > 0) {
+          resolve(matchingBooks);
+        } else {
+          reject("No books found with this title");
+        }
+      }, 100);
+    });
+    
+    // Process results using promises
+    getBooksByTitlePromise
+      .then((books) => {
+        res.status(200).json(books);
+      })
+      .catch((error) => {
+        res.status(404).json({ message: error });
+      });
 });
 
 //  Get book review
-public_users.get('/review/:isbn',function (req, res) {
-  //Write your code here
-  return res.status(300).json({message: "Yet to be implemented"});
-});
+public_users.get('/review/:isbn', function (req, res) {
+    // リクエストパラメータからISBNを取得
+    const isbn = req.params.isbn;
+    
+    // 指定されたISBNの本が存在するかチェック
+    if (books[isbn]) {
+      // 本が存在する場合、そのレビューを返す
+      const reviews = books[isbn].reviews;
+      
+      // レビューがあるかチェック
+      if (Object.keys(reviews).length > 0) {
+        res.status(200).json(reviews);
+      } else {
+        res.status(404).json({ message: "No reviews found for this book" });
+      }
+    } else {
+      // 本が存在しない場合はエラーを返す
+      res.status(404).json({ message: "Book not found with the given ISBN" });
+    }
+  });
 
 module.exports.general = public_users;