refs #723: externalize backoffice catalogs and MCP tools
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devmrko
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package com.cloudhandson.vpdbackoffice.service;
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import com.cloudhandson.vpdbackoffice.config.BackofficeProperties;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.node.ArrayNode;
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import com.fasterxml.jackson.databind.node.ObjectNode;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.sql.CallableStatement;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.ResultSetMetaData;
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import java.sql.Statement;
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import java.util.regex.Pattern;
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import org.springframework.stereotype.Service;
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/** Generates and executes bounded read-only SQL through a configured Select AI profile. */
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@Service
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public class SelectAiService {
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private static final int MAX_PROMPT_LENGTH = 4_000;
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private static final int MAX_RESULT_ROWS = 100;
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private static final int QUERY_TIMEOUT_SECONDS = 30;
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private static final Pattern UNSAFE_SQL = Pattern.compile(
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"(?is)\\b(?:insert|update|delete|merge|alter|drop|create|truncate|grant|revoke|"
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+ "commit|rollback|savepoint|lock|call|exec(?:ute)?|begin|declare|for\\s+update|"
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+ "dbms_[a-z0-9_]*|utl_[a-z0-9_]*|sys\\s*\\.)\\b"
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);
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private final BackofficeProperties properties;
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private final HmmMcpBearerAuthenticator bearerAuthenticator;
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private final ObjectMapper objectMapper;
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public SelectAiService(
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BackofficeProperties properties,
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HmmMcpBearerAuthenticator bearerAuthenticator,
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ObjectMapper objectMapper
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) {
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this.properties = properties;
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this.bearerAuthenticator = bearerAuthenticator;
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this.objectMapper = objectMapper;
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}
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public JsonNode generateAndExecute(String bearerToken, String prompt) {
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bearerAuthenticator.authenticate(bearerToken);
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String normalizedPrompt = requiredPrompt(prompt);
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BackofficeProperties.SelectAi selectAi =
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properties == null ? null : properties.selectAi();
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if (selectAi == null || !selectAi.configured()) {
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throw new AppException("Select AI 연결 설정이 필요합니다. "
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+ "BACKOFFICE_SELECT_AI_DB_URL, BACKOFFICE_SELECT_AI_DB_USERNAME, "
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+ "BACKOFFICE_SELECT_AI_DB_PASSWORD, BACKOFFICE_SELECT_AI_PROFILE을 확인하세요.");
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}
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String generatedSql = generate(selectAi, normalizedPrompt);
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String normalizedSql = validateReadOnlySql(generatedSql);
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QueryExecution execution = executeReadOnly(
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selectAi, normalizedSql, bearerToken.trim());
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ObjectNode response = objectMapper.createObjectNode();
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response.put("status", "SHOWSQL_AND_EXECUTED");
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response.put("profile", selectAi.profile());
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response.put("generatedSql", normalizedSql);
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response.put("execution", "READ_ONLY_EXECUTED");
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response.put("rowCount", execution.items().size());
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response.put("truncated", execution.truncated());
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response.set("items", execution.items());
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response.put("nextStep", execution.truncated()
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? "최초 " + MAX_RESULT_ROWS + "건만 반환했습니다."
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: "생성 SQL을 읽기 전용으로 실행한 결과입니다.");
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return response;
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}
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private String requiredPrompt(String prompt) {
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String normalized = prompt == null ? "" : prompt.trim();
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if (normalized.isEmpty()) {
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throw new AppException("prompt는 필수입니다.");
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}
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if (normalized.length() > MAX_PROMPT_LENGTH) {
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throw new AppException("prompt는 " + MAX_PROMPT_LENGTH + "자 이하여야 합니다.");
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}
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return normalized;
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}
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private String generate(
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BackofficeProperties.SelectAi selectAi,
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String prompt
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) {
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String sql = "SELECT DBMS_CLOUD_AI.GENERATE(?, ?, 'showsql') FROM dual";
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try (Connection connection = DriverManager.getConnection(
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selectAi.dbUrl(), selectAi.dbUsername(), selectAi.dbPassword());
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PreparedStatement statement = connection.prepareStatement(sql)) {
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statement.setString(1, prompt);
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statement.setString(2, selectAi.profile());
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try (ResultSet resultSet = statement.executeQuery()) {
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if (!resultSet.next() || resultSet.getString(1) == null) {
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throw new AppException("Select AI가 생성 SQL을 반환하지 않았습니다.");
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}
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return resultSet.getString(1);
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}
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} catch (AppException exception) {
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throw exception;
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} catch (Exception exception) {
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throw new AppException("Select AI SHOWSQL 생성 실패: " + safeMessage(exception));
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}
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}
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private QueryExecution executeReadOnly(
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BackofficeProperties.SelectAi selectAi,
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String generatedSql,
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String bearerToken
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) {
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ArrayNode items = objectMapper.createArrayNode();
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boolean truncated = false;
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try (Connection connection = DriverManager.getConnection(
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selectAi.dbUrl(), selectAi.dbUsername(), selectAi.dbPassword())) {
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boolean contextSet = false;
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try {
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try (CallableStatement statement = connection.prepareCall(
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"BEGIN ADMIN.HMM_ACCESS_CTX_PKG.SET_USER_BY_BEARER(?); END;")) {
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statement.setString(1, bearerToken);
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statement.execute();
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contextSet = true;
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}
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connection.setAutoCommit(false);
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connection.setReadOnly(true);
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try (Statement transaction = connection.createStatement()) {
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transaction.execute("SET TRANSACTION READ ONLY");
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}
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try (PreparedStatement statement = connection.prepareStatement(generatedSql)) {
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statement.setQueryTimeout(QUERY_TIMEOUT_SECONDS);
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statement.setFetchSize(MAX_RESULT_ROWS + 1);
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statement.setMaxRows(MAX_RESULT_ROWS + 1);
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try (ResultSet resultSet = statement.executeQuery()) {
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ResultSetMetaData metadata = resultSet.getMetaData();
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while (resultSet.next()) {
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if (items.size() >= MAX_RESULT_ROWS) {
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truncated = true;
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break;
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}
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ObjectNode row = items.addObject();
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for (int columnIndex = 1;
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columnIndex <= metadata.getColumnCount();
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columnIndex++) {
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String column = metadata.getColumnLabel(columnIndex);
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if (column == null || column.isBlank()) {
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column = metadata.getColumnName(columnIndex);
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}
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putResultValue(row, column, resultSet.getObject(columnIndex));
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}
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}
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}
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}
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} finally {
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try {
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connection.rollback();
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} finally {
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if (contextSet) {
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try (CallableStatement statement = connection.prepareCall(
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"BEGIN ADMIN.HMM_ACCESS_CTX_PKG.CLEAR_USER; END;")) {
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statement.execute();
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}
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}
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}
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}
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} catch (Exception exception) {
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throw new AppException("Select AI 생성 SQL 실행 실패: " + safeMessage(exception));
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}
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return new QueryExecution(items, truncated);
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}
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private void putResultValue(ObjectNode row, String column, Object value) {
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if (value == null) {
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row.putNull(column);
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} else if (value instanceof BigDecimal number) {
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row.put(column, number);
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} else if (value instanceof BigInteger number) {
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row.put(column, number);
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} else if (value instanceof Integer number) {
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row.put(column, number);
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} else if (value instanceof Long number) {
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row.put(column, number);
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} else if (value instanceof Short number) {
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row.put(column, number);
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} else if (value instanceof Float number) {
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row.put(column, number);
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} else if (value instanceof Double number) {
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row.put(column, number);
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} else if (value instanceof Boolean bool) {
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row.put(column, bool);
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} else {
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row.put(column, String.valueOf(value));
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}
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}
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String validateReadOnlySql(String generatedSql) {
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String normalized = generatedSql == null ? "" : generatedSql.trim();
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if (normalized.startsWith("```")) {
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int firstLineEnd = normalized.indexOf('\n');
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int closingFence = normalized.lastIndexOf("```");
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if (firstLineEnd >= 0 && closingFence > firstLineEnd) {
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normalized = normalized.substring(firstLineEnd + 1, closingFence).trim();
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}
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}
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normalized = normalized.replaceFirst(";\\s*$", "").trim();
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if (!normalized.matches("(?is)^(select|with)\\b.*")) {
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throw new AppException("Select AI가 읽기 전용 SELECT/WITH SQL을 반환하지 않았습니다.");
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}
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if (normalized.contains(";")) {
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throw new AppException("Select AI 결과에 여러 SQL 문장이 포함되어 있어 실행하지 않습니다.");
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}
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if (normalized.contains("--")
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|| normalized.contains("/*")
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|| normalized.contains("*/")
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|| UNSAFE_SQL.matcher(normalized).find()) {
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throw new AppException("Select AI 결과에 실행이 허용되지 않는 SQL 구문이 포함되어 있습니다.");
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}
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return normalized;
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}
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private String safeMessage(Exception exception) {
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String message = exception.getMessage();
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return message == null || message.isBlank()
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? exception.getClass().getSimpleName()
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: message;
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}
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private record QueryExecution(ArrayNode items, boolean truncated) {
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}
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}
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