feat(api-query-jpa): memberviewer 구현

modules/infrastructure/api-query-jpa/src/main/java/com/whoz_in/api_query_jpa/member/MemberViewerImpl.java

@@ -0,0 +1,42 @@
+package com.whoz_in.api_query_jpa.member;
+
+import com.whoz_in.main_api.query.member.application.MemberAuthInfo;
+import com.whoz_in.main_api.query.member.application.MemberViewer;
+import java.nio.ByteBuffer;
+import java.util.Optional;
+import java.util.UUID;
+import lombok.RequiredArgsConstructor;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+@Repository
+@RequiredArgsConstructor
+public class MemberViewerImpl implements MemberViewer {
+
+    private final JdbcClient jdbcClient;
+
+    @Override
+    public Optional<MemberAuthInfo> findAuthInfoByLoginId(String loginId) {
+        String sql = "select id, login_id, password from member_entity where login_id = ?";
+
+        return jdbcClient.sql(sql)
+                .param(loginId)
+                .query((rs, rowNum) -> {
+                    byte[] idBlob = rs.getBytes("id");
+                    UUID id = convertBlobToUUID(idBlob);
+
+                    return new MemberAuthInfo(
+                            id,
+                            rs.getString("login_id"),
+                            rs.getString("password")
+                    );
+                }).optional();
+    }
+
+    private UUID convertBlobToUUID(byte[] blob) {
+        ByteBuffer buffer = ByteBuffer.wrap(blob);
+        long mostSigBits = buffer.getLong();
+        long leastSigBits = buffer.getLong();
+        return new UUID(mostSigBits, leastSigBits);
+    }
+}