75 lines
2.6 KiB
JavaScript
75 lines
2.6 KiB
JavaScript
import { createRequire } from 'node:module';
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const require = createRequire(import.meta.url);
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const mysql2Version = require('mysql2/package.json').version;
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export const MYSQL2_EXPORTER_METADATA = Object.freeze({
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name: 'mysql2-show-create',
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version: '1.0.0',
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driverName: 'mysql2',
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driverVersion: mysql2Version,
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});
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export const DEFAULT_EXPORT_LIMITS = Object.freeze({
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connectTimeoutMs: 5_000,
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queryTimeoutMs: 5_000,
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totalTimeoutMs: 30_000,
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maxObjects: 5_000,
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maxDefinitionBytes: 1_048_576,
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});
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export class SchemaExportError extends Error {
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constructor(code, message) {
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super(message);
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this.name = 'SchemaExportError';
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this.code = code;
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}
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}
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/**
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* 配置在 Schema 治理入口已完成 development、主机白名单和固定库名校验；这里仅映射
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* 连接所需字段，固定禁用多语句以防止未来元数据查询被拼接为任意 SQL。
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*/
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export function buildConnectionOptions(config) {
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return {
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host: config.MYSQL_HOST,
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port: Number(config.MYSQL_PORT),
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user: config.MYSQL_USERNAME,
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password: config.MYSQL_PASSWORD,
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database: config.MYSQL_DATABASE,
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charset: 'utf8mb4',
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timezone: '+08:00',
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connectTimeout: DEFAULT_EXPORT_LIMITS.connectTimeoutMs,
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multipleStatements: false,
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enableKeepAlive: true,
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};
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}
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/**
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* 元数据对象名仍需防御性转义，避免控制字符破坏 `SHOW CREATE` 查询边界；名称不合法时
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* 不回显输入，确保异常路径不会把潜在敏感值写入日志。
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*/
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export function quoteIdentifier(identifier) {
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if (typeof identifier !== 'string' || identifier.length === 0 || /[\u0000-\u001F\u007F]/.test(identifier)) {
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throw new SchemaExportError('INVALID_IDENTIFIER', 'Schema 标识符不能为空且不得包含控制字符');
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}
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return `\`${identifier.replaceAll('`', '``')}\``;
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}
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/**
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* 导出器只接受项目数据库兼容基线，拒绝 MariaDB 和 MySQL 5.7 之外的服务器，避免相同
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* `SHOW CREATE` 文本在不兼容语义下被误认为可恢复的 Schema 快照。
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*/
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export function assertMysql57ServerMetadata(metadata) {
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if (!/^5\.7\.\d+(?:[-+].*)?$/.test(metadata?.serverVersion ?? '')) {
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throw new SchemaExportError('UNSUPPORTED_SERVER_VERSION', 'MySQL 服务端必须为 5.7.x');
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}
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if (metadata.databaseCharset !== 'utf8mb4') {
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throw new SchemaExportError('INVALID_DATABASE_CHARSET', '数据库字符集必须为 utf8mb4');
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}
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if (metadata.databaseCollation !== 'utf8mb4_general_ci') {
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throw new SchemaExportError('INVALID_DATABASE_COLLATION', '数据库排序规则必须为 utf8mb4_general_ci');
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}
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}
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