CLAP-60 Feat: 로그인 기능 구현

<footer>
- 관련: #19

Author: joowojr

src/main/java/clap/server/application/AuthService.java

@@ -0,0 +1,29 @@
+package clap.server.application.mapper.response;
+
+import clap.server.adapter.inbound.web.dto.auth.LoginResponse;
+import clap.server.adapter.inbound.web.dto.auth.MemberInfoResponse;
+import clap.server.domain.model.member.Member;
+
+public class AuthResponseMapper {
+    private AuthResponseMapper() {
+        throw new IllegalArgumentException();
+    }
+
+    public static LoginResponse toLoginResponse(final String accessToken, final String refreshToken, final Member member) {
+        return new LoginResponse(
+                accessToken,
+                refreshToken,
+                toMemberInfoResponse(member)
+        );
+    }
+
+    public static MemberInfoResponse toMemberInfoResponse(Member member) {
+        return new MemberInfoResponse(
+                member.getMemberId(),
+                member.getMemberInfo().getName(),
+                member.getMemberInfo().getNickname(),
+                member.getMemberInfo().getRole(),
+                member.getStatus()
+        );
+    }
+}

src/main/java/clap/server/application/mapper/response/AuthResponseMapper.java

@@ -1,5 +1,7 @@
 package clap.server.application.port.inbound.auth;
 
-public interface AuthUsecase {
+import clap.server.adapter.inbound.web.dto.auth.LoginResponse;
 
+public interface AuthUsecase {
+    LoginResponse login(String nickname, String password);
 }

src/main/java/clap/server/application/port/inbound/auth/AuthUsecase.java

@@ -8,4 +8,6 @@ public interface LoadMemberPort {
     Optional<Member> findById(Long id);
 
     Optional<Member> findActiveMemberById(Long id);
+
+    Optional<Member> findByNickname(String nickname);
 }

src/main/java/clap/server/application/port/outbound/member/LoadMemberPort.java

@@ -0,0 +1,40 @@
+package clap.server.application.service.auth;
+
+import clap.server.adapter.inbound.web.dto.auth.LoginResponse;
+import clap.server.domain.model.auth.CustomJwts;
+import clap.server.application.mapper.response.AuthResponseMapper;
+import clap.server.application.port.inbound.auth.AuthUsecase;
+import clap.server.application.port.outbound.member.LoadMemberPort;
+import clap.server.common.annotation.architecture.ApplicationService;
+import clap.server.domain.model.member.Member;
+import clap.server.exception.ApplicationException;
+import clap.server.exception.code.MemberErrorCode;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.transaction.annotation.Transactional;
+
+@ApplicationService
+@RequiredArgsConstructor
+class AuthService implements AuthUsecase {
+    private final LoadMemberPort loadMemberPort;
+    private final IssueTokenService issueTokenService;
+    private final PasswordEncoder passwordEncoder;
+
+    @Override
+    @Transactional
+    public LoginResponse login(String nickname, String password) {
+        Member member = loadMemberPort.findByNickname(nickname).orElseThrow(
+                () -> new ApplicationException(MemberErrorCode.MEMBER_NOT_FOUND));
+        if (passwordEncoder.matches(password, member.getPassword())) {
+            CustomJwts jwts = issueTokenService.createToken(member);
+            return AuthResponseMapper.toLoginResponse(
+                    jwts.accessToken(),
+                    jwts.refreshToken(),
+                    member
+            );
+        } else {
+            throw new ApplicationException(MemberErrorCode.MEMBER_NOT_FOUND);
+        }
+    }
+}