feat: refactor commitAndPush to use a runner function and improve token security; add tests for git operations

Reviewed-on: jiantw83/code-review#66

.gitea/ai-review/findings.json

@@ -0,0 +1,58 @@
+[
+  {
+    "level": "critical",
+    "role": "Leo",
+    "location": "app/git.js:11",
+    "suggestion": "GITEA_TOKEN 直接嵌入 URL 中，可能導致憑證洩漏。建議使用環境變數或安全的憑證管理方式來處理敏感資訊。",
+    "is_new": true
+  },
+  {
+    "level": "critical",
+    "role": "Maya",
+    "location": "app/git.js:1",
+    "suggestion": "缺少對 commitAndPush 函數的單元測試，應該為其添加測試以確保其正確性。",
+    "is_new": true
+  },
+  {
+    "level": "warning",
+    "role": "Leo",
+    "location": "app/git.js:25",
+    "suggestion": "在使用 fs.existsSync 檢查目錄是否存在時，應考慮使用非同步方法以避免阻塞事件循環。",
+    "is_new": true
+  },
+  {
+    "level": "warning",
+    "role": "Leo",
+    "location": "app/git.js:29",
+    "suggestion": "在 git clone 時使用 --depth=1 可能會導致未來需要完整歷史紀錄時的性能問題，建議根據實際需求調整。",
+    "is_new": true
+  },
+  {
+    "level": "warning",
+    "role": "Leo",
+    "location": "app/git.js:11",
+    "suggestion": "在使用 fs.copyFileSync 時，未檢查目標檔案是否存在，可能會覆蓋重要資料。建議在複製之前檢查檔案是否存在。",
+    "is_new": true
+  },
+  {
+    "level": "warning",
+    "role": "Leo",
+    "location": "app/git.js:11",
+    "suggestion": "在 commitAndPush 函數中，對於 git 操作的錯誤處理不夠完善，應該添加更多的測試來驗證不同情況下的行為。",
+    "is_new": true
+  },
+  {
+    "level": "info",
+    "role": "Leo",
+    "location": ".gitea/workflows/review.yaml:5",
+    "suggestion": "建議在 'branches-ignore' 前加上空行，以提高可讀性。",
+    "is_new": true
+  },
+  {
+    "level": "info",
+    "role": "Leo",
+    "location": "app/git.js:45",
+    "suggestion": "考慮使用 async/await 來處理 fs.copyFileSync，以提高可讀性和錯誤處理能力。",
+    "is_new": true
+  }
+]

.gitea/workflows/review.yaml

@@ -1,6 +1,11 @@
 name: AI
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref }}
+  cancel-in-progress: true
 on:
   pull_request:
+    branches-ignore:
+    - master
     types: [opened, synchronize]
 jobs:
   version:

Dockerfile

@@ -1,9 +1,9 @@
-FROM node:20-slim
+FROM alpine
 
-# force rebuild to ensure git is installed
+RUN apk add --no-cache bash nodejs npm git \
-RUN apt-get update && apt-get install -y --no-install-recommends \
+    && node --version \
-    git \
+    && npm --version \
-    && rm -rf /var/lib/apt/lists/*
+    && git --version
 
 WORKDIR /action
 

app/git.js

@@ -1,36 +1,63 @@
 import { spawnSync } from 'child_process';
+import fs from 'fs';
 import path from 'path';
 import { GITEA_SERVER_URL, GITEA_REPOSITORY, GITEA_TOKEN, PR_HEAD_BRANCH, FINDINGS_PATH } from './config.js';
 
-function git(args, cwd) {
+function makeRunner(spawn) {
-  const result = spawnSync('git', args, { cwd, encoding: 'utf8' });
+  return function run(args, cwd, env) {
+    const opts = { cwd, encoding: 'utf8' };
+    if (env) opts.env = env;
+    const result = spawn('git', args, opts);
     if (result.error) throw result.error;
     if (result.status !== 0) throw new Error((result.stderr || result.stdout || '').trim());
     return (result.stdout || '').trim();
+  };
 }
 
-export async function commitAndPush(workspace) {
+export async function commitAndPush(workspace, _spawnSync = spawnSync) {
-  const repoDir = path.join(workspace, GITEA_REPOSITORY);
+  const run = makeRunner(_spawnSync);
-  const remoteUrl = GITEA_SERVER_URL.replace(/\/$/, '').replace('https://', `https://${GITEA_TOKEN}@`).replace('http://', `http://${GITEA_TOKEN}@`) + `/${GITEA_REPOSITORY}.git`;
+
+  const baseUrl = GITEA_SERVER_URL.replace(/\/$/, '');
+  const remoteUrl = `${baseUrl}/${GITEA_REPOSITORY}.git`;
+  const repoDir = path.join(workspace, 'repo');
+
+  // Write a temporary askpass script so the token never appears in the URL or process list
+  const askpassScript = path.join(workspace, '.git-askpass.sh');
+  fs.writeFileSync(askpassScript, `#!/bin/sh\necho "${GITEA_TOKEN}"\n`, { mode: 0o700 });
+
+  const credEnv = { ...process.env, GIT_ASKPASS: askpassScript, GIT_USERNAME: 'x-token' };
 
   try {
-    git(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);
+    if (!fs.existsSync(repoDir)) {
-    git(['config', 'user.name', 'AI Review Bot'], repoDir);
+      run(['clone', '--depth=1', '--branch', PR_HEAD_BRANCH, remoteUrl, repoDir], workspace, credEnv);
-    git(['fetch', 'origin', PR_HEAD_BRANCH], repoDir);
+    }
-    git(['checkout', PR_HEAD_BRANCH], repoDir);
-    git(['add', FINDINGS_PATH], repoDir);
 
-    const status = git(['status', '--porcelain'], repoDir);
+    run(['config', 'user.email', 'ai-review[bot]@gitea'], repoDir);
+    run(['config', 'user.name', 'AI Review Bot'], repoDir);
+    run(['fetch', 'origin', PR_HEAD_BRANCH], repoDir, credEnv);
+    run(['checkout', PR_HEAD_BRANCH], repoDir);
+
+    // 將 findings.json 從 workspace 複製到 clone 的 repo
+    const srcFindings = path.join(workspace, FINDINGS_PATH);
+    const destFindings = path.join(repoDir, FINDINGS_PATH);
+    fs.mkdirSync(path.dirname(destFindings), { recursive: true });
+    fs.copyFileSync(srcFindings, destFindings);
+
+    run(['add', FINDINGS_PATH], repoDir);
+
+    const status = run(['status', '--porcelain'], repoDir);
     if (!status) {
       console.log('  findings.json 無變更，跳過 commit');
       return;
     }
 
-    const out = git(['commit', '-m', 'chore: update ai-review findings [skip ci]'], repoDir);
+    const out = run(['commit', '-m', 'chore: update ai-review findings [skip ci]'], repoDir);
     const commitHash = out.match(/\[.+ ([a-f0-9]+)\]/)?.[1] || 'unknown';
-    git(['push', remoteUrl, PR_HEAD_BRANCH], repoDir);
+    run(['push', remoteUrl, PR_HEAD_BRANCH], repoDir, credEnv);
     console.log(`  ✅ persisted findings  commit=${commitHash}  push=${PR_HEAD_BRANCH}`);
   } catch (e) {
     console.log(`  ⚠️  Runner failed: commit/push 失敗: ${e.message}`);
+  } finally {
+    try { fs.unlinkSync(askpassScript); } catch {}
   }
 }

app/git.test.js

@@ -0,0 +1,93 @@
+import { describe, it, before, after, beforeEach } from 'node:test';
+import assert from 'node:assert/strict';
+import fs from 'fs';
+import os from 'os';
+import path from 'path';
+import { commitAndPush } from './git.js';
+
+// --- helpers ---
+function makeTmpWorkspace() {
+  const ws = fs.mkdtempSync(path.join(os.tmpdir(), 'git-test-'));
+  // Pre-create repo dir so clone branch is skipped
+  fs.mkdirSync(path.join(ws, 'repo'), { recursive: true });
+  // Create a findings.json to copy
+  const findingsDir = path.join(ws, '.gitea/ai-review');
+  fs.mkdirSync(findingsDir, { recursive: true });
+  fs.writeFileSync(path.join(findingsDir, 'findings.json'), '[]');
+  return ws;
+}
+
+// Default stub: all commands succeed, status returns changes
+function makeSpawn(overrides = {}) {
+  const calls = [];
+  const spawn = (cmd, args, opts) => {
+    const key = args[0];
+    calls.push({ cmd, args, opts });
+    if (overrides[key]) return overrides[key](args, opts);
+    if (key === 'status') return { status: 0, stdout: 'M .gitea/ai-review/findings.json', stderr: '', error: null };
+    if (key === 'commit') return { status: 0, stdout: '[feature-branch abc1234] chore', stderr: '', error: null };
+    return { status: 0, stdout: '', stderr: '', error: null };
+  };
+  spawn.calls = calls;
+  return spawn;
+}
+
+describe('commitAndPush', () => {
+  let workspace;
+
+  before(() => { workspace = makeTmpWorkspace(); });
+  after(() => { fs.rmSync(workspace, { recursive: true, force: true }); });
+  beforeEach(() => {
+    // Remove leftover askpass scripts between tests
+    for (const f of fs.readdirSync(workspace)) {
+      if (f.endsWith('.git-askpass.sh')) fs.unlinkSync(path.join(workspace, f));
+    }
+  });
+
+  it('does not embed token in any git command argument', async () => {
+    const spawn = makeSpawn();
+    await commitAndPush(workspace, spawn);
+
+    for (const { args } of spawn.calls) {
+      assert.ok(!args.join(' ').includes('test-token'), `Token leaked in git args: ${args.join(' ')}`);
+    }
+  });
+
+  it('uses GIT_ASKPASS env for network operations (fetch, push, clone)', async () => {
+    const spawn = makeSpawn();
+    await commitAndPush(workspace, spawn);
+
+    const networkOps = ['fetch', 'push', 'clone'];
+    const networkCalls = spawn.calls.filter(c => networkOps.includes(c.args[0]));
+    assert.ok(networkCalls.length > 0, 'expected at least one network git call');
+
+    for (const { args, opts } of networkCalls) {
+      assert.ok(opts?.env?.GIT_ASKPASS, `GIT_ASKPASS missing for git ${args[0]}`);
+    }
+  });
+
+  it('cleans up askpass script after successful run', async () => {
+    await commitAndPush(workspace, makeSpawn());
+    const leftover = fs.readdirSync(workspace).filter(f => f.endsWith('.git-askpass.sh'));
+    assert.equal(leftover.length, 0, 'askpass script was not cleaned up');
+  });
+
+  it('cleans up askpass script even when git fails', async () => {
+    const failSpawn = () => ({ status: 1, stdout: '', stderr: 'fatal: error', error: null });
+    await commitAndPush(workspace, failSpawn);
+    const leftover = fs.readdirSync(workspace).filter(f => f.endsWith('.git-askpass.sh'));
+    assert.equal(leftover.length, 0, 'askpass script was not cleaned up after failure');
+  });
+
+  it('skips commit when status shows no changes', async () => {
+    const spawn = makeSpawn({ status: () => ({ status: 0, stdout: '', stderr: '', error: null }) });
+    await commitAndPush(workspace, spawn);
+    const commitCalled = spawn.calls.some(c => c.args[0] === 'commit');
+    assert.equal(commitCalled, false, 'commit should not run when there are no changes');
+  });
+
+  it('does not throw when git command fails', async () => {
+    const failSpawn = () => ({ status: 1, stdout: '', stderr: 'fatal: error', error: null });
+    await assert.doesNotReject(() => commitAndPush(workspace, failSpawn));
+  });
+});

app/package.json

@@ -2,6 +2,9 @@
   "name": "ai-code-review",
   "version": "1.0.0",
   "type": "module",
+  "scripts": {
+    "test": "node --test app/git.test.js"
+  },
   "dependencies": {
     "axios": "^1.6.7",
     "js-yaml": "^4.1.0",