feat: 마이페이지 계정정보 조회 API 추가

src/main/java/com/gdschongik/gdsc/domain/member/api/CommonMemberController.java

@@ -1,6 +1,7 @@
 package com.gdschongik.gdsc.domain.member.api;
 
 import com.gdschongik.gdsc.domain.member.application.CommonMemberService;
+import com.gdschongik.gdsc.domain.member.dto.response.MemberAccountInfoResponse;
 import com.gdschongik.gdsc.domain.member.dto.response.MemberDepartmentResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
@@ -34,4 +35,11 @@ public ResponseEntity<List<MemberDepartmentResponse>> searchDepartments(
         List<MemberDepartmentResponse> response = commonMemberService.searchDepartments(departmentName);
         return ResponseEntity.ok().body(response);
     }
+
+    @Operation(summary = "내 계정 정보 조회", description = "내 계정 정보를 조회합니다.")
+    @GetMapping("/me/account-info")
+    public ResponseEntity<MemberAccountInfoResponse> getAccountInfo() {
+        MemberAccountInfoResponse response = commonMemberService.getAccountInfo();
+        return ResponseEntity.ok().body(response);
+    }
 }

src/main/java/com/gdschongik/gdsc/domain/member/application/CommonMemberService.java

@@ -5,10 +5,13 @@
 import com.gdschongik.gdsc.domain.member.dao.MemberRepository;
 import com.gdschongik.gdsc.domain.member.domain.Department;
 import com.gdschongik.gdsc.domain.member.domain.Member;
+import com.gdschongik.gdsc.domain.member.dto.response.MemberAccountInfoResponse;
 import com.gdschongik.gdsc.domain.member.dto.response.MemberDepartmentResponse;
 import com.gdschongik.gdsc.domain.membership.dao.MembershipRepository;
 import com.gdschongik.gdsc.domain.membership.domain.Membership;
 import com.gdschongik.gdsc.global.exception.CustomException;
+import com.gdschongik.gdsc.global.util.MemberUtil;
+import com.gdschongik.gdsc.infra.github.client.GithubClient;
 import java.util.Arrays;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
@@ -23,6 +26,8 @@ public class CommonMemberService {
 
     private final MembershipRepository membershipRepository;
     private final MemberRepository memberRepository;
+    private final MemberUtil memberUtil;
+    private final GithubClient githubClient;
 
     @Transactional(readOnly = true)
     public List<MemberDepartmentResponse> getDepartments() {
@@ -81,4 +86,11 @@ public void demoteMemberToAssociateByMembership(Long membershipId) {
 
         log.info("[CommonMemberService] 준회원 강등 완료: memberId={}", member.getId());
     }
+
+    @Transactional(readOnly = true)
+    public MemberAccountInfoResponse getAccountInfo() {
+        Member currentMember = memberUtil.getCurrentMember();
+        String githubHandle = githubClient.getGithubHandle(currentMember.getOauthId());
+        return MemberAccountInfoResponse.of(currentMember, githubHandle);
+    }
 }

src/main/java/com/gdschongik/gdsc/domain/member/dto/response/MemberAccountInfoResponse.java

@@ -0,0 +1,9 @@
+package com.gdschongik.gdsc.domain.member.dto.response;
+
+import com.gdschongik.gdsc.domain.member.domain.Member;
+
+public record MemberAccountInfoResponse(String name, String githubHandle) {
+    public static MemberAccountInfoResponse of(Member member, String githubHandle) {
+        return new MemberAccountInfoResponse(member.getName(), githubHandle);
+    }
+}

src/main/java/com/gdschongik/gdsc/global/common/constant/GithubConstant.java

@@ -4,6 +4,7 @@ public class GithubConstant {
 
     public static final String GITHUB_DOMAIN = "github.com/";
     public static final String GITHUB_ASSIGNMENT_PATH = "week%d/WIL.md";
+    public static final String GITHUB_USER_API_URL = "https://api.github.com/user/%s";
 
     private GithubConstant() {}
 }

src/main/java/com/gdschongik/gdsc/global/exception/ErrorCode.java

@@ -167,6 +167,7 @@ public enum ErrorCode {
     GITHUB_CONTENT_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 파일입니다."),
     GITHUB_FILE_READ_FAILED(HttpStatus.INTERNAL_SERVER_ERROR, "깃허브 파일 읽기에 실패했습니다."),
     GITHUB_COMMIT_DATE_FETCH_FAILED(HttpStatus.INTERNAL_SERVER_ERROR, "깃허브 커밋 날짜 조회에 실패했습니다."),
+    GITHUB_USER_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 깃허브 유저입니다."),
     ;
     private final HttpStatus status;
     private final String message;

src/main/java/com/gdschongik/gdsc/infra/github/GithubUserRequest.java

@@ -0,0 +1,58 @@
+package com.gdschongik.gdsc.infra.github;
+
+import static com.gdschongik.gdsc.global.common.constant.GithubConstant.*;
+
+import com.gdschongik.gdsc.global.exception.CustomException;
+import com.gdschongik.gdsc.global.exception.ErrorCode;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.List;
+import java.util.Map;
+import lombok.RequiredArgsConstructor;
+import org.kohsuke.github.connector.GitHubConnectorRequest;
+
+@RequiredArgsConstructor
+public class GithubUserRequest implements GitHubConnectorRequest {
+
+    private final String oauthId;
+
+    @Override
+    public String method() {
+        return "GET";
+    }
+
+    @Override
+    public Map<String, List<String>> allHeaders() {
+        return Map.of();
+    }
+
+    @Override
+    public String header(String s) {
+        return "";
+    }
+
+    @Override
+    public String contentType() {
+        return "";
+    }
+
+    @Override
+    public InputStream body() {
+        return null;
+    }
+
+    @Override
+    public URL url() {
+        try {
+            return new URL(GITHUB_USER_API_URL.formatted(oauthId));
+        } catch (MalformedURLException e) {
+            throw new CustomException(ErrorCode.INTERNAL_SERVER_ERROR);
+        }
+    }
+
+    @Override
+    public boolean hasBody() {
+        return false;
+    }
+}

src/main/java/com/gdschongik/gdsc/infra/github/client/GithubClient.java

@@ -3,26 +3,32 @@
 import static com.gdschongik.gdsc.global.common.constant.GithubConstant.*;
 import static com.gdschongik.gdsc.global.exception.ErrorCode.*;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.gdschongik.gdsc.domain.study.domain.AssignmentSubmission;
 import com.gdschongik.gdsc.domain.study.domain.AssignmentSubmissionFetchExecutor;
 import com.gdschongik.gdsc.domain.study.domain.AssignmentSubmissionFetcher;
 import com.gdschongik.gdsc.global.exception.CustomException;
+import com.gdschongik.gdsc.infra.github.GithubUserRequest;
 import java.io.IOException;
 import java.io.InputStream;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
+import java.util.Map;
 import lombok.RequiredArgsConstructor;
 import org.kohsuke.github.GHCommit;
 import org.kohsuke.github.GHContent;
 import org.kohsuke.github.GHRepository;
 import org.kohsuke.github.GitHub;
+import org.kohsuke.github.connector.GitHubConnector;
+import org.kohsuke.github.connector.GitHubConnectorResponse;
 import org.springframework.stereotype.Component;
 
 @Component
 @RequiredArgsConstructor
 public class GithubClient {
 
     private final GitHub github;
+    private final GitHubConnector gitHubConnector = GitHubConnector.DEFAULT;
 
     public GHRepository getRepository(String ownerRepo) {
         try {
@@ -32,6 +38,16 @@ public GHRepository getRepository(String ownerRepo) {
         }
     }
 
+    public String getGithubHandle(String oauthId) {
+        try (GitHubConnectorResponse response = gitHubConnector.send(new GithubUserRequest(oauthId));
+                InputStream inputStream = response.bodyStream(); ) {
+            // api가 login이라는 이름으로 사용자의 github handle을 반환합니다.
+            return (String) new ObjectMapper().readValue(inputStream, Map.class).get("login");
+        } catch (IOException e) {
+            throw new CustomException(GITHUB_USER_NOT_FOUND);
+        }
+    }
+
     /**
      * 직접 요청을 수행하는 대신, fetcher를 통해 요청을 수행합니다.
      * 요청 수행 시 발생하는 예외의 경우 과제 채점에 사용되므로, 실제 요청은 채점 로직 내부에서 수행되어야 합니다.