226 lines
6.9 KiB
Python
226 lines
6.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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数据隐私保护层
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核心原则:发给外部 LLM 的信息只包含 schema 级别的元数据,
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绝不包含真实数据值。所有真实数据仅在本地代码执行环境中使用。
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分级策略:
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- SAFE(安全级): 可发送给 LLM — 列名、数据类型、行列数、空值率、唯一值数量
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- LOCAL(本地级): 仅本地使用 — 真实数据值、TOP N 高频值、统计数值、样本行
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"""
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import re
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import pandas as pd
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from typing import List, Optional
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def build_safe_profile(file_paths: list) -> str:
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"""
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生成可安全发送给外部 LLM 的数据画像。
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只包含 schema 信息,不包含任何真实数据值。
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Args:
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file_paths: 数据文件路径列表
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Returns:
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安全的 Markdown 格式数据画像
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"""
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import os
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profile = "# 数据结构概览 (Schema Profile)\n\n"
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if not file_paths:
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return profile + "未提供数据文件。"
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for file_path in file_paths:
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file_name = os.path.basename(file_path)
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profile += f"## 文件: {file_name}\n\n"
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if not os.path.exists(file_path):
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profile += f"[WARN] 文件不存在: {file_path}\n\n"
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continue
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try:
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df = _load_dataframe(file_path)
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if df is None:
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continue
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rows, cols = df.shape
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profile += f"- **维度**: {rows} 行 x {cols} 列\n"
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profile += f"- **列名**: `{', '.join(df.columns)}`\n\n"
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profile += "### 列结构:\n\n"
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profile += "| 列名 | 数据类型 | 空值率 | 唯一值数 | 特征描述 |\n"
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profile += "|------|---------|--------|---------|----------|\n"
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for col in df.columns:
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dtype = str(df[col].dtype)
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null_count = df[col].isnull().sum()
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null_pct = f"{(null_count / rows) * 100:.1f}%" if rows > 0 else "0%"
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unique_count = df[col].nunique()
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# 特征描述:只描述数据特征,不暴露具体值
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feature_desc = _describe_column_safe(df[col], unique_count, rows)
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profile += f"| {col} | {dtype} | {null_pct} | {unique_count} | {feature_desc} |\n"
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profile += "\n"
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except Exception as e:
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profile += f"[ERROR] 读取文件失败: {str(e)}\n\n"
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return profile
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def build_local_profile(file_paths: list) -> str:
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"""
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生成完整的本地数据画像(包含真实数据值)。
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仅用于本地代码执行环境,不发送给 LLM。
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这是原来 load_and_profile_data 的功能,保留完整信息。
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"""
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from utils.data_loader import load_and_profile_data
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return load_and_profile_data(file_paths)
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def sanitize_execution_feedback(feedback: str, max_lines: int = 30) -> str:
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"""
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对代码执行反馈进行脱敏处理,移除可能包含真实数据的内容。
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保留:
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- 执行状态(成功/失败)
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- 错误信息
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- DataFrame 的 shape 信息
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- 图片保存路径
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- 列名信息
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移除/截断:
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- 具体的数据行(DataFrame 输出)
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- 大段的数值输出
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Args:
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feedback: 原始执行反馈
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max_lines: 最大保留行数
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Returns:
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脱敏后的反馈
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"""
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if not feedback:
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return feedback
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lines = feedback.split("\n")
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safe_lines = []
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in_dataframe_output = False
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df_line_count = 0
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for line in lines:
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stripped = line.strip()
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# 始终保留的关键信息
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if any(kw in stripped for kw in [
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"图片已保存", "保存至", "[OK]", "[WARN]", "[ERROR]",
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"[Auto-Save]", "数据表形状", "列名:", ".png",
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"shape", "columns", "dtype", "info()", "describe()",
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]):
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safe_lines.append(line)
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in_dataframe_output = False
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continue
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# 检测 DataFrame 输出的开始(通常有列头行)
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if _looks_like_dataframe_row(stripped):
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if not in_dataframe_output:
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in_dataframe_output = True
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df_line_count = 0
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safe_lines.append("[数据输出已省略 - 数据仅在本地执行环境中可见]")
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df_line_count += 1
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continue
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# 检测纯数值行
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if _is_numeric_heavy_line(stripped):
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if not in_dataframe_output:
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in_dataframe_output = True
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safe_lines.append("[数值输出已省略]")
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continue
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# 普通文本行
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in_dataframe_output = False
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safe_lines.append(line)
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# 限制总行数
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if len(safe_lines) > max_lines:
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safe_lines = safe_lines[:max_lines]
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safe_lines.append(f"[... 输出已截断,共 {len(lines)} 行]")
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return "\n".join(safe_lines)
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def _load_dataframe(file_path: str):
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"""加载 DataFrame,支持多种格式和编码"""
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import os
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ext = os.path.splitext(file_path)[1].lower()
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if ext == ".csv":
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for encoding in ["utf-8", "gbk", "gb18030", "latin1"]:
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try:
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return pd.read_csv(file_path, encoding=encoding)
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except (UnicodeDecodeError, Exception):
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continue
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elif ext in [".xlsx", ".xls"]:
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try:
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return pd.read_excel(file_path)
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except Exception:
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pass
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return None
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def _describe_column_safe(series: pd.Series, unique_count: int, total_rows: int) -> str:
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"""安全地描述列特征,不暴露具体值"""
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dtype = series.dtype
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if pd.api.types.is_numeric_dtype(dtype):
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if unique_count <= 5:
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return "低基数数值(可能是分类编码)"
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elif unique_count < total_rows * 0.05:
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return "离散数值"
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else:
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return "连续数值"
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if pd.api.types.is_datetime64_any_dtype(dtype):
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return "时间序列"
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# 文本/分类列
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if unique_count == 1:
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return "单一值(常量列)"
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elif unique_count <= 10:
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return f"低基数分类({unique_count}类)"
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elif unique_count <= 50:
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return f"中基数分类({unique_count}类)"
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elif unique_count > total_rows * 0.8:
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return "高基数文本(可能是ID或描述)"
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else:
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return f"文本分类({unique_count}类)"
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def _looks_like_dataframe_row(line: str) -> bool:
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"""判断一行是否看起来像 DataFrame 输出"""
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if not line:
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return False
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# DataFrame 输出通常有多个空格分隔的列
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parts = line.split()
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if len(parts) >= 3:
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# 第一个元素是索引(数字)
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try:
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int(parts[0])
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return True
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except ValueError:
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pass
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return False
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def _is_numeric_heavy_line(line: str) -> bool:
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"""判断一行是否主要由数值组成"""
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if not line or len(line) < 5:
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return False
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digits_and_dots = sum(1 for c in line if c.isdigit() or c in ".,-+eE ")
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return digits_and_dots / len(line) > 0.7
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