feat(user): 实现用户登录和身份验证功能

- 新增用户登录接口和相关逻辑
- 实现 token 生成和验证功能- 添加用户信息查询接口
- 集成拦截器进行身份验证
- 优化错误处理和提示信息

src/main/java/com/example/copykamanotes/config/WebConfig.java

@@ -0,0 +1,27 @@
+package com.example.copykamanotes.config;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import com.example.copykamanotes.interceptor.TokenInterceptor;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+    @Autowired
+    private TokenInterceptor tokenInterceptor;
+
+
+    /**
+     * 添加拦截器, 拦截所有请求，除了登录和注册
+     * @param registry 拦截器注册器
+     */
+    @Override
+    public void addInterceptors(InterceptorRegistry registry) {
+        registry.addInterceptor(tokenInterceptor)
+                .addPathPatterns("/api/**")
+                .excludePathPatterns("/api/users/login", "/api/users/register");
+    }
+
+}

src/main/java/com/example/copykamanotes/controller/UserController.java

@@ -1,7 +1,9 @@
 package com.example.copykamanotes.controller;
 
 import com.example.copykamanotes.model.base.ApiResponse;
+import com.example.copykamanotes.model.dto.user.LoginRequest;
 import com.example.copykamanotes.model.dto.user.RegisterRequest;
+import com.example.copykamanotes.model.vo.user.LoginUserVO;
 import com.example.copykamanotes.model.vo.user.RegisterVO;
 import com.example.copykamanotes.service.UserService;
 import lombok.extern.slf4j.Slf4j;
@@ -31,4 +33,18 @@ public class UserController {
     public ApiResponse<String> hello() {
         return ApiResponse.success("Hello World");
     }
+
+    @PostMapping("/users/login")
+    public ApiResponse<LoginUserVO> login(
+            @Valid
+            @RequestBody
+            LoginRequest loginRequest
+    ) {
+        return userService.login(loginRequest);
+    }
+
+    @PostMapping("/users/whoami")
+    public ApiResponse<LoginUserVO> whoami() {
+        return userService.whoami();
+    }
 }

src/main/java/com/example/copykamanotes/interceptor/TokenInterceptor.java

@@ -0,0 +1,44 @@
+package com.example.copykamanotes.interceptor;
+
+import com.example.copykamanotes.scope.RequestScopeData;
+import com.example.copykamanotes.utils.JwtUtil;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.web.servlet.HandlerInterceptor;
+
+@Component
+public class TokenInterceptor implements HandlerInterceptor {
+
+    @Autowired
+    private RequestScopeData requestScopeData;
+
+    @Autowired
+    private JwtUtil jwtUtil;
+
+    @Override
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
+        String token = request.getHeader("Authorization");
+
+        if (token == null) {
+            requestScopeData.setLogin(false);
+            requestScopeData.setUserId(null);
+            requestScopeData.setUserId(null);
+            return true;
+        }
+
+        token = token.replace("Bearer ", "");
+
+        if (!jwtUtil.validateToken(token)) {
+            Long userId = jwtUtil.getUserIdFromToken(token);
+            requestScopeData.setUserId(userId);
+            requestScopeData.setToken(token);
+            requestScopeData.setLogin(true);
+        } else {
+            requestScopeData.setLogin(false);
+        }
+        return HandlerInterceptor.super.preHandle(request, response, handler);
+    }
+}

src/main/java/com/example/copykamanotes/mapper/UserMapper.java

@@ -18,4 +18,6 @@ public interface UserMapper {
     User findByEmail(@Param("email") String email);
 
     int updateLastLoginAt(@Param("userId") Long userId);
+
+    User findById(@Param("userId") Long userId);
 }

src/main/java/com/example/copykamanotes/service/impl/UserServiceImpl.java

@@ -15,6 +15,7 @@ import com.example.copykamanotes.service.EmailService;
 import com.example.copykamanotes.service.UserService;
 import com.example.copykamanotes.utils.ApiResponseUtil;
 import com.example.copykamanotes.utils.JwtUtil;
+import com.google.protobuf.Api;
 import lombok.extern.log4j.Log4j2;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -86,18 +87,66 @@ public class UserServiceImpl implements UserService {
             return ApiResponseUtil.success("注册成功", registerVO, token);
         } catch (Exception e) {
             log.error("注册失败", e);
-            return ApiResponseUtil.error("注册失败");
+            return ApiResponseUtil.error("注册失败，请稍后再试");
         }
     }
 
     @Override
     public ApiResponse<LoginUserVO> login(LoginRequest loginRequest) {
-        return null;
+        User user = null;
+
+        if (loginRequest.getAccount() != null && !loginRequest.getAccount().isEmpty()) {
+            user = userMapper.findByAccount(loginRequest.getAccount());
+        } else if (loginRequest.getEmail() != null && !loginRequest.getEmail().isEmpty()) {
+            user = userMapper.findByEmail(loginRequest.getEmail());
+        } else {
+            return ApiResponseUtil.error("账号或邮箱不能为空");
+        }
+
+        if (user == null) {
+            return ApiResponseUtil.error("账号或邮箱不存在");
+        }
+
+        if (!passwordEncoder.matches(loginRequest.getPassword(), user.getPassword())) {
+            return ApiResponseUtil.error("密码错误");
+        }
+
+        String token = jwtUtil.generateToken(user.getUserId());
+
+        LoginUserVO loginUserVO = new LoginUserVO();
+        BeanUtils.copyProperties(user, loginUserVO);
+
+        userMapper.updateLastLoginAt(user.getUserId());
+
+        return ApiResponseUtil.success("登录成功", loginUserVO, token);
     }
 
     @Override
     public ApiResponse<LoginUserVO> whoami() {
-        return null;
+        Long userId = requestScopeData.getUserId();
+
+        if (userId == null) {
+            return ApiResponseUtil.error("未登录");
+        }
+
+        try {
+            User user = userMapper.findById(userId);
+            if (user == null) {
+                return ApiResponseUtil.error("用户不存在");
+            }
+
+            String newToken = jwtUtil.generateToken(userId);
+            if (newToken == null) {
+                return ApiResponseUtil.error("token生成失败");
+            }
+
+            LoginUserVO loginUserVO = new LoginUserVO();
+            BeanUtils.copyProperties(user, loginUserVO);
+            return ApiResponseUtil.success("获取用户信息成功", loginUserVO, newToken);
+        } catch (Exception e) {
+            log.error("获取用户信息失败", e);
+            return ApiResponseUtil.error("获取用户信息失败");
+        }
     }
 
     @Override

src/main/java/com/example/copykamanotes/utils/JwtUtil.java

@@ -45,7 +45,7 @@ public class JwtUtil {
     public Long getUserIdFromToken(String token) {
         try {
             Claims claims = Jwts.parser()
-                    .setSigningKey(secret)
+                    .setSigningKey(SECRET_KEY)
                     .parseClaimsJws(token)
                     .getBody();
             return Long.valueOf(claims.get("userId").toString());

src/main/resources/mapper/UserMapper.xml

@@ -31,6 +31,12 @@
                 NOW())
     </insert>
 
+    <select id="findById" resultType="com.example.copykamanotes.model.entity.User">
+        select *
+        from user
+        where user_id = #{userId}
+    </select>
+
     <select id="findByEmail" resultType="com.example.copykamanotes.model.entity.User">
         SELECT *
         FROM user