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feat: Add comprehensive tests for contentPattern and glob pattern matching
- Implemented final verification tests for contentPattern to validate behavior with empty strings, dangerous patterns, and normal patterns. - Created glob pattern matching tests to verify regex conversion and matching functionality. - Developed infinite loop risk tests using Worker threads to isolate potential blocking operations. - Introduced optimized contentPattern tests to validate improvements in the findMatches function. - Added verification tests to assess the effectiveness of contentPattern optimizations. - Conducted safety tests for contentPattern to identify edge cases and potential vulnerabilities. - Implemented unrestricted loop tests to analyze infinite loop risks without match limits. - Developed tests for zero-width pattern detection logic to ensure proper handling of dangerous regex patterns.
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ccw-contentPattern-optimization-summary.md
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ccw-contentPattern-optimization-summary.md
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# CCW MCP read_file contentPattern 优化总结
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## 优化背景
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基于分析会话 ANL-ccw-mcp-file-tools-2025-02-08 的结论,对 `read_file` 工具的 `contentPattern` 参数进行了安全性和易用性优化。
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## 实施的优化
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### 1. 空字符串行为优化
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- **之前**: 空字符串 `""` 返回错误
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- **之后**: 空字符串 `""` 返回全文(设计行为)
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- **实现**: `findMatches` 返回 `null` 表示"匹配所有内容"
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### 2. 危险模式安全回退
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- **之前**: 危险模式(如 `x*`)被拦截,返回空结果
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- **之后**: 危险模式自动回退到返回全文(安全回退)
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- **实现**: 检测到零宽度模式时返回 `null`,而不是 `[]`
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### 3. 增强的错误处理
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- 模式长度限制(1000 字符)→ 超限返回全文
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- 无效正则表达式 → 返回全文而不是报错
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- 迭代计数器保护(最大 1000 次迭代)
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- 位置前进检查(防止 `regex.exec()` 卡住)
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- 结果去重(使用 `Set` 防止重复行)
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## 最终行为矩阵
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| contentPattern 值 | 行为 | 返回值 | 文件是否包含 |
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|-------------------|------|--------|--------------|
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| `""` (空字符串) | 匹配所有内容 | `null` | ✅ 包含 |
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| `"x*"` (危险模式) | 安全回退 | `null` | ✅ 包含 |
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| `"CCW"` (正常匹配) | 正常过滤 | `["匹配行"]` | ✅ 包含 |
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| `"NOMATCH"` (无匹配) | 跳过文件 | `[]` | ❌ 不包含 |
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## 代码变更
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### findMatches 函数签名
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```typescript
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// 之前
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function findMatches(content: string, pattern: string): string[]
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// 之后
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function findMatches(content: string, pattern: string): string[] | null
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```
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### 返回值语义
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- `null` → 匹配所有内容(不进行过滤)
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- `[]` → 无匹配(跳过文件)
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- `[string]` → 有匹配(返回匹配行)
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### Schema 更新
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```typescript
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contentPattern: {
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type: 'string',
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description: 'Regex pattern to search within file content. Empty string "" returns all content. Dangerous patterns (e.g., "x*") automatically fall back to returning all content for safety.',
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}
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```
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## 验证测试
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运行 `node test-final-verification.js` 验证所有行为:
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```bash
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node test-final-verification.js
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```
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预期输出:
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```
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✅ 所有测试通过!
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行为总结:
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空字符串 "" → 返回全文(设计行为)
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危险模式 "x*" → 返回全文(安全回退)
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正常模式 "CCW" → 正常过滤
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无匹配 "NOMATCH" → 跳过文件
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```
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## 相关文件
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- `ccw/src/tools/read-file.ts` - 主要实现
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- `test-final-verification.js` - 最终验证测试
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- `test-mcp-tools.mjs` - MCP 工具参数验证
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## 安全特性
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1. **零宽度模式检测**: 在空字符串上双重 `exec` 测试
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2. **迭代计数器**: 防止 ReDoS 攻击
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3. **位置前进检查**: `match.index === lastIndex` 时强制前进
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4. **结果去重**: 使用 `Set` 防止重复匹配
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## 用户反馈处理
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用户关键反馈:
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> "空字符串 │ "" │ 输出错误并拦截 │ ✅ 这样不应该输出错误吧, 应该默认输出全部内容 read file"
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实施结果:
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- ✅ 空字符串返回全文(不是错误)
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- ✅ 危险模式返回全文(不是拦截)
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- ✅ 方法说明已更新
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## 构建和测试
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```bash
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# 构建
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npm run build
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# 测试 MCP 工具
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node test-mcp-tools.mjs
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# 测试 contentPattern 行为
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node test-final-verification.js
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# 通过 CLI 测试
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ccw tool exec read_file '{"paths":"README.md","contentPattern":"x*"}'
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```
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## 完成状态
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- ✅ P0 任务 1: read_file offset/limit 多文件验证
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- ✅ P0 任务 2: edit_file discriminatedUnion 重构
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- ✅ contentPattern 安全性优化
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- ✅ 空字符串行为修正
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- ✅ 危险模式安全回退
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- ✅ 方法说明更新
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- ✅ 验证测试通过
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## 优化日期
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2025-02-08
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## 相关分析会话
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ANL-ccw-mcp-file-tools-2025-02-08
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