#!/usr/bin/env node
/**
 * PreToolUse Hook: 宿法 ERROR 级规则预检 (v6.0 F2-4, v6.1 P1-13)
 * Matcher: Write|Edit
 *
 * constitution-guard.js 在 PostToolUse 阻不住写入前的错误。
 * 本钉子在 PreToolUse 阶段对最高风险 ERROR 规则进行前置拦截。
 *
 * 规则:
 *   exec-injection      — child_process 参数含变量拼接
 *   hardcoded-secret    — 硬编码 API Key / Token
 *   hidden-network-egress — 新增到非本地地址的网络请求 (从 constitution-guard 提升)
 *   prototype-pollution  — __proto__ / constructor.prototype 赋值 (从 constitution-guard 提升)
 *
 * 退出码: 0=放行 | 2=阻断  Fail-close: 异常时 exit(2) 阻断写入 (P1-11)
 */
'use strict';
const fs = require('fs');
const path = require('path');
const readStdin = require('./lib/read-stdin.js');
try {
  const { isEnabled } = require('../scripts/feature-flags.js');
  if (!isEnabled('constitution-precheck')) process.exit(0);
} catch {}
const CODE_EXTENSIONS = /.(?:js|ts|jsx|tsx|mjs|cjs|mts|cts|py|go|rs|java|rb|php|sh|bash|zsh|ps1|html|svg|xml|yaml|yml|json|toml)$/i; // [XC12] 扩展覆盖更多代码/配置文件类型
const PRECHECK_RULES = [
  {
    id: 'exec-injection',
    label: '命令注入: child_process 参数含变量拼接',
    pattern: /(?:exec|execSync|execFile|execFileSync|spawn|spawnSync|fork)\s*\(\s*(?:`[^`]*\$\{|['"][^'"]*['"]\s*\+)/,
  },
  {
    id: 'hardcoded-secret',
    label: '硬编码密鑰: 包含高熵密鑰字符串',
    pattern: /(?:api[_-]?key|api[_-]?secret|access[_-]?token|secret[_-]?key|auth[_-]?token|private[_-]?key|db[_-]?password|token|credential|password|passwd|pwd)\s*[=:]\s*['"`][A-Za-z0-9+\/=_\-]{20,}['"`]/i,
  },
  // #11: 从 constitution-guard warning 提升到 precheck 硬拦截
  {
    id: 'timed-network-call',
    label: '定时外联: setInterval/setTimeout 中包含网络请求',
    pattern: /(?:setInterval|setTimeout)\s*\(\s*(?:async\s*)?\(\s*\)\s*=>\s*\{[^}]*(?:fetch|https?\.request|https?\.get)/,
  },
  {
    id: 'base64-obfuscation',
    label: 'Base64 混淆: decode 后执行',
    pattern: /(?:Buffer\.from|atob)\s*\([^)]+,\s*['"]base64['"]\s*\).*(?:eval|Function|require)/,
  },
  // P1-13: 从 constitution-guard.js (PostToolUse) 提升到 PreToolUse 实现硬拦截
  {
    id: 'hidden-network-egress',
    label: '疑似隐蔽外联: 新增到非本地地址的网络请求',
    pattern: /(?:https?\.request|https?\.get|fetch)\s*\(\s*['"`]https?:\/\/(?!localhost|127\.|0\.0\.0\.0|10\.|192\.168\.|172\.(?:1[6-9]|2\d|3[01])\.|169\.254\.|::1|fe80:|fc[0-9a-f]{2}:|fd[0-9a-f]{2}:|2001:0?:|2002:|64:ff9b:)/,  // PATCH-SSRF-IPv6-RFC1918-V1: IPv6+RFC1918
  },
  {
    id: 'prototype-pollution',
    label: '原型污染风险: __proto__ 或 constructor.prototype 赋值',
    pattern: /(?:__proto__|constructor\s*\.\s*prototype)\s*(?:=|\[)/,
  },
  // P1-CC-W1: 宪法 11.1 禁止 eval/new Function/vm.runIn* (之前仅覆盖 exec)
  {
    id: 'eval-execution',
    label: '禁止 eval/new Function/vm.runIn*: 宪法第十一章硬拦截',
    pattern: /\b(?:eval|new\s+Function|vm\s*\.\s*runIn(?:NewContext|ThisContext|Context))\s*\(/,
  },
];
function extractContent(ti) {
  return ti ? (ti.content || '') + (ti.new_string || '') : '';
}
function detectViolation(content) {
  const lines = (content || '').split('\n');
  // Phase 1: 单行检测
  for (const rule of PRECHECK_RULES) {
    for (let i = 0; i < lines.length; i++) {
      if (rule.pattern && rule.pattern.test(lines[i])) {
        return { id: rule.id, label: rule.label, line: i + 1 };
      }
    }
  }
  // Phase 2: L3 多行检测 — 合并相邻行匹配高危规则
  const ML_IDS = new Set(['exec-injection', 'eval-execution', 'hardcoded-secret']);
  const mlRules = PRECHECK_RULES.filter(r => ML_IDS.has(r.id));
  if (mlRules.length > 0 && lines.length > 1 && content.length < 200 * 1024) {
    for (let i = 0; i < lines.length - 1; i++) {
      const m2 = lines[i].trimEnd() + " " + lines[i + 1].trimStart();
      for (const rule of mlRules) {
        if (rule.pattern && rule.pattern.test(m2)) {
          return { id: rule.id, label: rule.label + ' (跨行检测)', line: i + 1 };
        }
      }
      if (i < lines.length - 2) {
        const m3 = m2.trimEnd() + " " + lines[i + 2].trimStart();
        for (const rule of mlRules) {
          if (rule.pattern && rule.pattern.test(m3)) {
            return { id: rule.id, label: rule.label + ' (跨行检测)', line: i + 1 };
          }
        }
      }
    }
  }
  return null;
}
function logEvent(ruleId, filePath, lineNo) {
  try {
    const root = path.dirname(__filename).replace(/[\/\\]hooks$/, '');
    const dir = path.join(root, 'debug');
    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
    const f = path.join(dir, `security-${new Date().toISOString().slice(0,10)}.jsonl`);
    fs.appendFileSync(f, JSON.stringify({ ts: new Date().toISOString(), decision: 'deny', hook: 'constitution-precheck', rule: ruleId, line: lineNo }) + '\n');
  } catch {}
}
function main() {
  readStdin({ maxSize: 512 * 1024 }).then(input => {
    const fp = input.tool_input?.file_path || '';
    if (!fp || !CODE_EXTENSIONS.test(fp)) { process.exit(0); return; }
    const content = extractContent(input.tool_input);
    if (!content) { process.exit(0); return; }
    const v = detectViolation(content);
    if (v) {
      logEvent(v.id, fp, v.line);
      process.stderr.write(JSON.stringify({
        hookSpecificOutput: { permissionDecision: 'deny' },
        systemMessage: [
          '[constitution-precheck] ERROR 级违规，已阻断写入',
          `文件: ${path.basename(fp)}, 行: ${v.line}`,
          `规则: [${v.id}] ${v.label}`,
          '请修复后重试。参考: constitution/AI-CONSTITUTION.md 第十一章',
        ].join('\n'),
      }));
      process.exit(2); return;
    }
    process.exit(0);
  }).catch(() => process.exit(2)); // P1-11: fail-close
}
if (typeof module !== 'undefined') {
  module.exports = { PRECHECK_RULES, detectViolation, extractContent, CODE_EXTENSIONS };
}
if (require.main === module) main();