feat: 이미지 최적화 2·3차(imageAutoSizes/imageSizesPreset) 및 문서/플랜 반영 (TDD)

- ExportOptions.imageAutoSizes 추가 및 기본 sizes 자동 적용
- ExportOptions.imageSizesPreset 추가(mobile-first/desktop-fixed)
- 우선순위: imageSizes > preset > auto > none
- 테스트 케이스 확장(image.responsive.options.test.ts)
- README/MAIN_PLAN 업데이트

MAIN_PLAN.md

@@ -95,7 +95,15 @@
  - Exporter CSS 토큰 회귀 확대(:root --primary, body font, skip-link base/focus, focus outline, reduced-motion)
  - 컴포넌트 i18n 회귀 스냅샷(en/ko 주요 라벨/버튼 키 존재)
  - 섹션 a11y 자동 검증 템플릿(testUtils/sectionA11y) 도입 및 템플릿 테스트 추가
- - 신규 섹션 추가: Benefits
+ - 이미지 최적화 옵션 1차(TDD): hero 이미지에 `fetchpriority`/`srcset`/`sizes` 조건부 렌더링
+  - 테스트: `lib/exporter/image.responsive.options.test.ts` (속성 존재 검증)
+  - 구현: `lib/exporter/html.ts`(`ExportOptions`에 옵션 추가 및 `<img>` 렌더 반영)
+  - 브랜치: `feat/image-optimization` (로컬 커밋, 푸쉬 보류)
+ - 이미지 최적화 옵션 2차(TDD): `srcset`만 제공 시 기본 `sizes` 자동 적용(`imageAutoSizes`)
+  - 기본값: `(max-width: 640px) 100vw, 600px`
+  - 테스트: `image.responsive.options.test.ts` (auto on/off 케이스)
+  - 구현: `ExportOptions.imageAutoSizes` 추가 및 `renderHero` 적용
+  - 신규 섹션 추가: Benefits
   - 스키마 확장(`benefits`): props.items:string[]
   - Exporter 렌더 추가: `<section class="benefits" aria-labelledby>`, `<h2 id="benefits-heading">`, 리스트 렌더
   - 테스트: sections.benefits.test.ts (h2/aria-labelledby/리스트 아이템 검증)
@@ -369,8 +377,14 @@
 - `assets.index.json` 그룹 정렬/경로 전략(grouped/flat) 커버리지 확장
 - `referencedAt` 추적(HTML 내 `rewriteUrl('local:...')`) 매트릭스 테스트
 - `verifyIntegrity` 유틸 구현 및 TDD(정상/변조/누락/번들해시 불일치) 통과
+- `assets.integrity.index.json`에 `size`(byte) 추가, `verifyIntegrity`에서 크기 불일치 검증
+- `verifyIntegrity` 결과에 `summary`(total/missing/integrityMismatches/sizeMismatches/bundleHashMismatch) 추가
 - Export Options(폰트 프리커넥트/프리로드, 이미지 로딩/디코딩, robots 메타) UI/문서화
 - 브랜치 푸쉬 완료: `feat/export-bundle-integrity`
+ - 이미지 최적화 옵션(1차): `fetchpriority`/`srcset`/`sizes` 추가 및 테스트 그린
+
+### 하드닝
+- ZIP 경로 가드: `../`, 절대경로(`/`), 역슬래시(`\`) 차단 (테스트 포함)
 
 ### TDD 계획 및 상태
 - 테스트 선작성 → 최소 구현 → 리팩터/문서화
@@ -384,9 +398,10 @@
 
 ### 다음 작업
 1) PR 생성(템플릿/라벨): `feat/export-bundle-integrity` → `main`
-2) CI 무결성 검증 스텝 추가: `verifyIntegrity`로 빌드 산출물 검사
+2) CI 무결성 검증 스텝 추가: `verifyIntegrity`로 빌드 산출물 검사(요약 리포트 로깅)
 3) PR 라벨 자동화 및 조건부 머지(Gitea Actions/웹훅)
 4) README에 사용 가이드 보완(verifyIntegrity 활용 예시)
+5) 이미지 최적화 2차: `sizes` 기본 정책 프리셋 및 변환 파이프라인(AVIF/WebP) 설계 초안(TDD 스텁)
 
 ### CI/CD 계획(초안)
 - PR 오픈 시: 라벨 자동 지정, 테스트/빌드, 무결성 검증 스텝 실행

README.md

@@ -63,6 +63,13 @@ The Builder can export a production-ready ZIP that contains:
 - Image Options
   - Loading: `lazy` (default) or `eager` for `<img loading>`
   - Decoding: `async` (default) or `sync` for `<img decoding>`
+  - Fetch Priority: optional `high|low` for `<img fetchpriority>`
+  - Srcset/Sizes: optional responsive sources via `<img srcset>` and `<img sizes>`
+  - Auto Sizes: when enabled and only `srcset` is provided, a sensible default is applied to `<img sizes>`: `(max-width: 640px) 100vw, 600px`
+  - Sizes Preset: choose a preset for `<img sizes>` when `imageSizes` is not set.
+    - `mobile-first`: `(max-width: 640px) 100vw, 800px`
+    - `desktop-fixed`: `1200px`
+  - Precedence: explicit `imageSizes` > `imageSizesPreset` > `imageAutoSizes` > none
 
 ### site.webmanifest and robots.txt
 
@@ -97,15 +104,31 @@ Simple index to quickly find assets by group:
 
 ### assets.integrity.index.json
 
-- entries: array of `{ path, integrity }`
+- entries: array of `{ path, integrity, size }`
   - `path`: asset `zipPath` (e.g. `assets/abcd1234.png` or grouped `assets/images/...`)
   - `integrity`: `sha256-<base64>` (real SHA-256 of the asset bytes)
+  - `size`: byte length of the asset
 - bundleHash: `sha256-<base64>` over a deterministic join of `path` and `integrity` for all entries
 
 Usage:
 - Verify file-level integrity by recomputing SHA-256(base64) of each asset and comparing with `entries[].integrity`.
+- Verify file size matches `entries[].size`.
 - Verify bundle integrity by recomputing `bundleHash` from sorted entries; useful for quick tamper detection.
 
+Example (Node):
+
+```ts
+import { verifyIntegrity } from '@/lib/exporter/verify'
+
+// extras must include 'assets.integrity.index.json', assets is a map of zipPath -> bytes
+const result = verifyIntegrity(extras, assets)
+if (!result.ok) {
+  console.error('Integrity check failed:', result.errors)
+}
+console.log('Summary:', result.summary)
+// { total, missing, integrityMismatches, sizeMismatches, bundleHashMismatch }
+```
+
 ### Google Sheets template (optional)
 
 - When included, ZIP contains:

lib/exporter/assets.integrity.index.ts

@@ -1,7 +1,7 @@
 import type { AssetManager } from '@/lib/assets/assetManager'
 
 export type AssetsIntegrityIndex = {
-  entries: Array<{ path: string; integrity: string }>
+  entries: Array<{ path: string; integrity: string; size: number }>
   bundleHash: string
 }
 
@@ -84,6 +84,7 @@ export function buildAssetsIntegrityIndex(am: AssetManager): Uint8Array {
   const entries = am.list().map(ref => ({
     path: ref.path,
     integrity: `sha256-${sha256Base64(ref.bytes)}`,
+    size: ref.bytes.length,
   }))
   // 2) Sort entries by path for deterministic output
   entries.sort((a, b) => a.path.localeCompare(b.path))

lib/exporter/extras.ts

@@ -68,13 +68,25 @@ export function buildExtrasForPage(page: Page, overrides?: ExtrasOverrides): Rec
     const code = `/**
  * Google Apps Script Web App for form submissions
  * - Deploy as Web App and set URL as form action if needed.
+ * @tool: landing-builder
+ * @version: 1.0.0
  */
 function doPost(e){
-  // TODO: handle submission to Google Sheets
-  return ContentService.createTextOutput('OK')
+  try {
+    // TODO: map incoming fields to sheet columns
+    // Example:
+    // const payload = JSON.parse(e.postData.contents || '{}');
+    // const row = [payload.name, payload.email, new Date()];
+    // SpreadsheetApp.openById('YOUR_SHEET_ID').getSheetByName('Sheet1').appendRow(row);
+    return ContentService.createTextOutput('OK')
+  } catch (e) {
+    return ContentService
+      .createTextOutput('ERROR: ' + (e && (e as any).message ? (e as any).message : 'unknown'))
+      .setMimeType(ContentService.MimeType.TEXT)
+  }
 }
 `
-    const readme = `Google Sheets Apps Script Template\n\n1) Apps Script에서 새 프로젝트를 만들고 아래 Code.gs를 붙여넣으세요.\n2) 배포 > 웹 앱으로 배포 후 URL을 복사해 사용하세요.`
+    const readme = `Google Sheets Apps Script Template\n\n1) Apps Script에서 새 프로젝트를 만들고 아래 Code.gs를 붙여넣으세요.\n2) Deploy as Web App로 배포 후 URL을 복사해 사용하세요.\n3) Map fields to columns: 제출 payload의 필드를 시트 컬럼에 매핑하세요.`
     out['sheets/Code.gs'] = toBytes(code)
     out['sheets/README.txt'] = toBytes(readme)
   }

lib/exporter/html.ts

@@ -9,6 +9,11 @@ export type ExportOptions = {
   robotsMeta?: string
   imageLoading?: 'lazy' | 'eager'
   imageDecoding?: 'async' | 'sync'
+  imageFetchPriority?: 'high' | 'low'
+  imageSrcset?: string
+  imageSizes?: string
+  imageAutoSizes?: boolean
+  imageSizesPreset?: 'mobile-first' | 'desktop-fixed'
 }
 
 function renderFaq(section: { props: { items: Array<{ q: string; a: string }> } }) {
@@ -125,6 +130,17 @@ function renderHero(section: { props: { heading: string; subheading?: string; im
   const imageUrl = am ? am.rewriteUrl(imageUrlRaw) : imageUrlRaw
   const loading = opts?.imageLoading ?? 'lazy'
   const decoding = opts?.imageDecoding ?? 'async'
+  const fetchpriority = opts?.imageFetchPriority ? ` fetchpriority="${escapeHtml(opts.imageFetchPriority)}"` : ''
+  const srcset = opts?.imageSrcset ? ` srcset="${escapeHtml(opts.imageSrcset)}"` : ''
+  const defaultSizes = '(max-width: 640px) 100vw, 600px'
+  const presetSizes = (() => {
+    if (!opts?.imageSizesPreset) return ''
+    if (opts.imageSizesPreset === 'mobile-first') return '(max-width: 640px) 100vw, 800px'
+    if (opts.imageSizesPreset === 'desktop-fixed') return '1200px'
+    return ''
+  })()
+  const sizesValue = opts?.imageSizes ?? (presetSizes || (opts?.imageSrcset && opts?.imageAutoSizes ? defaultSizes : ''))
+  const sizes = sizesValue ? ` sizes="${escapeHtml(sizesValue)}"` : ''
   return `
     <section class="hero" aria-labelledby="hero-heading">
       <div class="container">
@@ -133,7 +149,7 @@ function renderHero(section: { props: { heading: string; subheading?: string; im
           ${subheading.length > 0 ? `<p>${escapeHtml(subheading)}</p>` : ''}
         </div>
         <div class="media">
-          <img src="${escapeHtml(imageUrl)}" alt="${escapeHtml(heading)}" loading="${escapeHtml(loading)}" decoding="${escapeHtml(decoding)}" width="1200" height="675" />
+          <img src="${escapeHtml(imageUrl)}" alt="${escapeHtml(heading)}" loading="${escapeHtml(loading)}" decoding="${escapeHtml(decoding)}"${fetchpriority}${srcset}${sizes} width="1200" height="675" />
         </div>
       </div>
     </section>

lib/exporter/image.responsive.options.test.ts

@@ -0,0 +1,87 @@
+import { describe, it, expect } from 'vitest'
+import { exportPage } from '@/lib/exporter/html'
+import type { ExportOptions } from '@/lib/exporter/html'
+import type { Page } from '@/lib/schema/page'
+
+const basePage: Page = {
+  title: 'Img Test',
+  locale: 'en',
+  theme: { primaryColor: '#0ea5e9', fontFamily: 'Inter' },
+  sections: [
+    { type: 'hero', props: { heading: 'Hero', subheading: '', imageUrl: 'https://example.com/hero.jpg' } },
+  ],
+  form: {
+    actionUrl: '',
+    fields: [],
+    spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 },
+  },
+  analytics: { ga4MeasurementId: '', metaPixelId: '', customHeadHtml: '' },
+  seo: { title: 'T', description: 'D' },
+}
+
+describe('image responsive/export options', () => {
+  it('applies fetchpriority when provided', () => {
+    const options: ExportOptions = { imageLoading: 'eager', imageDecoding: 'async', imageFetchPriority: 'high' }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*fetchpriority="high"/)
+  })
+
+  it('applies srcset and sizes when provided', () => {
+    const options: ExportOptions = {
+      imageSrcset: 'https://example.com/hero.jpg 1x, https://example.com/hero@2x.jpg 2x',
+      imageSizes: '(max-width: 640px) 100vw, 600px',
+    }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*srcset="https:\/\/example.com\/hero.jpg 1x, https:\/\/example.com\/hero@2x.jpg 2x"/)
+    expect(html).toMatch(/<img[^>]*sizes="\(max-width: 640px\) 100vw, 600px"/)
+  })
+
+  it('applies default sizes when srcset is provided and imageAutoSizes is true', () => {
+    const options: ExportOptions = {
+      imageSrcset: 'https://example.com/hero.jpg 1x, https://example.com/hero@2x.jpg 2x',
+      imageAutoSizes: true,
+    }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*srcset="https:\/\/example.com\/hero.jpg 1x, https:\/\/example.com\/hero@2x.jpg 2x"/)
+    expect(html).toMatch(/<img[^>]*sizes="\(max-width: 640px\) 100vw, 600px"/)
+  })
+
+  it('does not include sizes when srcset is provided but imageAutoSizes is false and sizes not provided', () => {
+    const options: ExportOptions = {
+      imageSrcset: 'https://example.com/hero.jpg 1x, https://example.com/hero@2x.jpg 2x',
+      imageAutoSizes: false,
+    }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*srcset="https:\/\/example.com\/hero.jpg 1x, https:\/\/example.com\/hero@2x.jpg 2x"/)
+    expect(html).not.toMatch(/<img[^>]*sizes="/)
+  })
+
+  it('applies preset sizes when imageSizesPreset is set (mobile-first)', () => {
+    const options: ExportOptions = {
+      imageSrcset: 'https://example.com/hero.jpg 1x, https://example.com/hero@2x.jpg 2x',
+      imageSizesPreset: 'mobile-first',
+    }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*sizes="\(max-width: 640px\) 100vw, 800px"/)
+  })
+
+  it('applies desktop-fixed preset when selected', () => {
+    const options: ExportOptions = {
+      imageSrcset: 'https://example.com/hero.jpg 1x, https://example.com/hero@2x.jpg 2x',
+      imageSizesPreset: 'desktop-fixed',
+    }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*sizes="1200px"/)
+  })
+
+  it('explicit imageSizes overrides presets and auto', () => {
+    const options: ExportOptions = {
+      imageSrcset: 'https://example.com/hero.jpg 1x, https://example.com/hero@2x.jpg 2x',
+      imageAutoSizes: true,
+      imageSizesPreset: 'desktop-fixed',
+      imageSizes: '(max-width: 768px) 100vw, 700px',
+    }
+    const { html } = exportPage(basePage, options)
+    expect(html).toMatch(/<img[^>]*sizes="\(max-width: 768px\) 100vw, 700px"/)
+  })
+})

lib/exporter/sheets.template.enhance.test.ts

@@ -0,0 +1,46 @@
+import { describe, it, expect } from 'vitest'
+import { buildExtrasForPage } from '@/lib/exporter/extras'
+import type { Page } from '@/lib/schema/page'
+
+function td(b: Uint8Array){ return new TextDecoder().decode(b) }
+
+const basePage: Page = {
+  title: 'Test',
+  seo: { title: 'T', description: 'D' },
+  theme: { primaryColor: '#0ea5e9', fontFamily: 'Inter' },
+  analytics: { ga4MeasurementId: '', metaPixelId: '', customHeadHtml: '' },
+  sections: [],
+  form: {
+    fields: [],
+    actionUrl: '',
+    spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 },
+  },
+  locale: 'en',
+}
+
+describe('Sheets template enhance', () => {
+  it('includes version/meta and mapping/error guide in Code.gs and README', () => {
+    const extras = buildExtrasForPage(basePage, { sheetsMode: 'include' })
+    const code = td(extras['sheets/Code.gs'])
+    const readme = td(extras['sheets/README.txt'])
+
+    // version/meta header
+    expect(code).toMatch(/@version:\s*\d+\.\d+\.\d+/)
+    expect(code).toMatch(/@tool:\s*landing-builder/i)
+
+    // field mapping and error handling guides
+    expect(code).toMatch(/TODO:\s*map incoming fields to sheet columns/i)
+    expect(code).toMatch(/try\s*\{/)
+    expect(code).toMatch(/catch\s*\(e\)/)
+
+    // README includes setup and mapping hint
+    expect(readme).toMatch(/Apps Script/i)
+    expect(readme).toMatch(/Deploy as Web App/i)
+    expect(readme).toMatch(/Map fields to columns/i)
+  })
+
+  it('respects exclude mode', () => {
+    const extras = buildExtrasForPage(basePage, { sheetsMode: 'exclude' })
+    expect(Object.keys(extras).some(k => k.startsWith('sheets/'))).toBe(false)
+  })
+})

lib/exporter/verify.integrity.test.ts

@@ -0,0 +1,81 @@
+import { describe, it, expect } from 'vitest'
+import { AssetManager } from '@/lib/assets/assetManager'
+import { buildAssetsIntegrityIndex } from '@/lib/exporter/assets.integrity.index'
+import { verifyIntegrity } from '@/lib/exporter/verify'
+
+function u8(n: number): Uint8Array { const a = new Uint8Array(n); for (let i=0;i<n;i++) a[i]=i&0xff; return a }
+
+function td(b: Uint8Array){ return new TextDecoder().decode(b) }
+function te(s: string){ return new TextEncoder().encode(s) }
+
+describe('verifyIntegrity', () => {
+  it('returns ok=true for valid assets and integrity index', async () => {
+    const am = new AssetManager({ maxBytes: 1024*1024, allowedExts: ['png','txt'] })
+    const a = await am.add({ name: 'a.png', type: 'image/png', bytes: u8(5) })
+    const b = await am.add({ name: 'b.txt', type: 'text/plain', bytes: u8(7) })
+    const assets = am.toZipStructure()
+    const idx = buildAssetsIntegrityIndex(am)
+    const extras: Record<string, Uint8Array> = { 'assets.integrity.index.json': idx }
+
+    const res = verifyIntegrity(extras, assets)
+    expect(res.ok).toBe(true)
+    expect(res.errors.length).toBe(0)
+    // summary
+    const parsedIdx = JSON.parse(td(idx)) as { entries: Array<{ path: string }> }
+    expect(res.summary.total).toBe(parsedIdx.entries.length)
+    expect(res.summary.missing).toBe(0)
+    expect(res.summary.integrityMismatches).toBe(0)
+    expect(res.summary.sizeMismatches).toBe(0)
+    expect(res.summary.bundleHashMismatch).toBe(false)
+    // sanity: index contains both paths
+    const parsed = JSON.parse(td(idx)) as { entries: Array<{ path: string }> }
+    const paths = parsed.entries.map(e => e.path)
+    expect(paths).toContain(a.path)
+    expect(paths).toContain(b.path)
+  })
+
+  it('detects byte tampering in an asset', async () => {
+    const am = new AssetManager({ maxBytes: 1024*1024, allowedExts: ['png','txt'] })
+    await am.add({ name: 'a.png', type: 'image/png', bytes: u8(5) })
+    await am.add({ name: 'b.txt', type: 'text/plain', bytes: u8(7) })
+    const assets = am.toZipStructure()
+    const idx = buildAssetsIntegrityIndex(am)
+    // tamper one asset byte
+    const somePath = Object.keys(assets)[0]
+    const tampered = assets[somePath].slice()
+    tampered[0] = (tampered[0] ^ 0xff) & 0xff
+    assets[somePath] = tampered
+
+    const res = verifyIntegrity({ 'assets.integrity.index.json': idx }, assets)
+    expect(res.ok).toBe(false)
+    expect(res.errors.some((e: string) => e.includes(somePath) && e.toLowerCase().includes('mismatch'))).toBe(true)
+    expect(res.summary.integrityMismatches).toBeGreaterThanOrEqual(1)
+  })
+
+  it('detects missing entry or missing asset referenced by index', async () => {
+    const am = new AssetManager({ maxBytes: 1024*1024, allowedExts: ['png','txt'] })
+    await am.add({ name: 'a.png', type: 'image/png', bytes: u8(5) })
+    await am.add({ name: 'b.txt', type: 'text/plain', bytes: u8(7) })
+    const assets = am.toZipStructure()
+    const idxRaw = buildAssetsIntegrityIndex(am)
+    const obj = JSON.parse(td(idxRaw)) as { entries: Array<{ path: string; integrity: string }>, bundleHash: string }
+    // remove one entry
+    const removed = obj.entries.shift()!
+    const idx2 = te(JSON.stringify(obj))
+
+    const res1 = verifyIntegrity({ 'assets.integrity.index.json': idx2 }, assets)
+    expect(res1.ok).toBe(false)
+    expect(res1.errors.some((e: string) => e.toLowerCase().includes('bundlehash'))).toBe(true)
+    expect(res1.summary.bundleHashMismatch).toBe(true)
+
+    // reference a missing path in index
+    obj.entries.unshift({ path: 'assets/missing.bin', integrity: 'sha256-AAAA' })
+    const idx3 = te(JSON.stringify(obj))
+    const res2 = verifyIntegrity({ 'assets.integrity.index.json': idx3 }, assets)
+    expect(res2.ok).toBe(false)
+    expect(res2.errors.some((e: string) => e.includes('assets/missing.bin') && e.toLowerCase().includes('missing'))).toBe(true)
+    expect(res2.summary.missing).toBeGreaterThanOrEqual(1)
+    // keep lints happy
+    expect(removed).toBeTruthy()
+  })
+})

lib/exporter/verify.ts

@@ -0,0 +1,146 @@
+export type VerifyResult = {
+  ok: boolean;
+  errors: string[];
+  summary: {
+    total: number;
+    missing: number;
+    integrityMismatches: number;
+    sizeMismatches: number;
+    bundleHashMismatch: boolean;
+  };
+}
+
+// Minimal synchronous SHA-256 implementation returning base64 string.
+function sha256Base64(bytes: Uint8Array): string {
+  const K = new Uint32Array([
+    0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
+    0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
+    0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
+    0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
+    0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
+    0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
+    0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
+    0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
+  ])
+  const H = new Uint32Array([
+    0x6a09e667,0xbb67ae85,0x3c6ef372,0xa54ff53a,0x510e527f,0x9b05688c,0x1f83d9ab,0x5be0cd19
+  ])
+  const l = bytes.length
+  const bitLenHi = Math.floor((l >>> 29))
+  const bitLenLo = (l << 3) >>> 0
+  const withOne = l + 1
+  const padLen = ((withOne % 64) <= 56) ? (56 - (withOne % 64)) : (56 + 64 - (withOne % 64))
+  const totalLen = withOne + padLen + 8
+  const m = new Uint8Array(totalLen)
+  m.set(bytes)
+  m[l] = 0x80
+  m[totalLen - 8] = (bitLenHi >>> 24) & 0xff
+  m[totalLen - 7] = (bitLenHi >>> 16) & 0xff
+  m[totalLen - 6] = (bitLenHi >>> 8) & 0xff
+  m[totalLen - 5] = (bitLenHi >>> 0) & 0xff
+  m[totalLen - 4] = (bitLenLo >>> 24) & 0xff
+  m[totalLen - 3] = (bitLenLo >>> 16) & 0xff
+  m[totalLen - 2] = (bitLenLo >>> 8) & 0xff
+  m[totalLen - 1] = (bitLenLo >>> 0) & 0xff
+  const W = new Uint32Array(64)
+  for (let i = 0; i < totalLen; i += 64) {
+    for (let t = 0; t < 16; t++) {
+      const j = i + t * 4
+      W[t] = (m[j] << 24) | (m[j + 1] << 16) | (m[j + 2] << 8) | (m[j + 3])
+    }
+    for (let t = 16; t < 64; t++) {
+      const s0 = (rotr(W[t - 15], 7) ^ rotr(W[t - 15], 18) ^ (W[t - 15] >>> 3)) >>> 0
+      const s1 = (rotr(W[t - 2], 17) ^ rotr(W[t - 2], 19) ^ (W[t - 2] >>> 10)) >>> 0
+      W[t] = (W[t - 16] + s0 + W[t - 7] + s1) >>> 0
+    }
+    let a = H[0], b = H[1], c = H[2], d = H[3], e = H[4], f = H[5], g = H[6], h = H[7]
+    for (let t = 0; t < 64; t++) {
+      const S1 = (rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25)) >>> 0
+      const ch = ((e & f) ^ (~e & g)) >>> 0
+      const temp1 = (h + S1 + ch + K[t] + W[t]) >>> 0
+      const S0 = (rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22)) >>> 0
+      const maj = ((a & b) ^ (a & c) ^ (b & c)) >>> 0
+      const temp2 = (S0 + maj) >>> 0
+      h = g; g = f; f = e; e = (d + temp1) >>> 0; d = c; c = b; b = a; a = (temp1 + temp2) >>> 0
+    }
+    H[0] = (H[0] + a) >>> 0
+    H[1] = (H[1] + b) >>> 0
+    H[2] = (H[2] + c) >>> 0
+    H[3] = (H[3] + d) >>> 0
+    H[4] = (H[4] + e) >>> 0
+    H[5] = (H[5] + f) >>> 0
+    H[6] = (H[6] + g) >>> 0
+    H[7] = (H[7] + h) >>> 0
+  }
+  const out = new Uint8Array(32)
+  for (let i = 0; i < 8; i++) {
+    out[i*4+0]=(H[i]>>>24)&0xff; out[i*4+1]=(H[i]>>>16)&0xff; out[i*4+2]=(H[i]>>>8)&0xff; out[i*4+3]=(H[i]>>>0)&0xff
+  }
+  if (typeof Buffer !== 'undefined') return Buffer.from(out).toString('base64')
+  let s = ''; for (let i=0;i<out.length;i++) s += String.fromCharCode(out[i])
+  const btoaFn = (globalThis as unknown as { btoa?: (s: string) => string }).btoa
+  if (!btoaFn) throw new Error('btoa not available')
+  return btoaFn(s)
+  function rotr(x: number, n: number) { return (x >>> n) | (x << (32 - n)) }
+}
+
+export function verifyIntegrity(
+  extras: Record<string, Uint8Array>,
+  assets: Record<string, Uint8Array>
+): VerifyResult {
+  const errors: string[] = []
+  const key = 'assets.integrity.index.json'
+  if (!Object.prototype.hasOwnProperty.call(extras, key)) {
+    return { ok: false, errors: ['Missing assets.integrity.index.json in extras'], summary: { total: 0, missing: 0, integrityMismatches: 0, sizeMismatches: 0, bundleHashMismatch: false } }
+  }
+  let parsed: { entries: Array<{ path: string; integrity: string; size?: number }>; bundleHash: string }
+  try {
+    parsed = JSON.parse(new TextDecoder().decode(extras[key]))
+  } catch {
+    return { ok: false, errors: ['Invalid assets.integrity.index.json JSON'], summary: { total: 0, missing: 0, integrityMismatches: 0, sizeMismatches: 0, bundleHashMismatch: false } }
+  }
+  // verify each entry exists and integrity matches
+  const recomputedLines: string[] = []
+  let missing = 0
+  let integrityMismatches = 0
+  let sizeMismatches = 0
+  for (const e of parsed.entries) {
+    const bytes = assets[e.path]
+    if (!bytes) {
+      errors.push(`Missing asset for path in integrity index: ${e.path}`)
+      missing++
+      continue
+    }
+    // optional size check when present in index
+    if (typeof e.size === 'number' && e.size !== bytes.length) {
+      errors.push(`Size mismatch for ${e.path}: expected ${e.size}, got ${bytes.length}`)
+      sizeMismatches++
+    }
+    const b64 = sha256Base64(bytes)
+    const integ = `sha256-${b64}`
+    if (integ !== e.integrity) {
+      errors.push(`Integrity mismatch for ${e.path}`)
+      integrityMismatches++
+    }
+    recomputedLines.push(e.path)
+    recomputedLines.push(integ)
+  }
+  // recompute bundle hash
+  const joined = new TextEncoder().encode(recomputedLines.join('\n'))
+  const bundle = `sha256-${sha256Base64(joined)}`
+  const bundleHashMismatch = bundle !== parsed.bundleHash
+  if (bundleHashMismatch) {
+    errors.push('BundleHash mismatch')
+  }
+  return {
+    ok: errors.length === 0,
+    errors,
+    summary: {
+      total: parsed.entries.length,
+      missing,
+      integrityMismatches,
+      sizeMismatches,
+      bundleHashMismatch,
+    },
+  }
+}

lib/exporter/zip.pathGuard.test.ts

@@ -0,0 +1,29 @@
+import { describe, it, expect } from 'vitest'
+import { buildZip } from '@/lib/exporter/zip'
+
+function u8(s: string): Uint8Array {
+  return new TextEncoder().encode(s)
+}
+
+describe('buildZip path guard', () => {
+  it('rejects dangerous asset paths with .. segments', async () => {
+    await expect(
+      buildZip({ html: '', css: '', js: '', assets: { '../evil.txt': u8('x') } })
+    ).rejects.toThrow(/invalid asset path/i)
+  })
+
+  it('rejects dangerous extras with absolute path and backslashes', async () => {
+    await expect(
+      buildZip({ html: '', css: '', js: '', extras: { '/abs.txt': u8('x') } })
+    ).rejects.toThrow(/invalid extra path/i)
+
+    await expect(
+      buildZip({ html: '', css: '', js: '', extras: { 'assets\\x.bin': u8('x') } })
+    ).rejects.toThrow(/invalid extra path/i)
+  })
+
+  it('accepts safe relative paths under assets/', async () => {
+    const zip = await buildZip({ html: '', css: '', js: '', assets: { 'assets/a.bin': u8('ok') } })
+    expect(zip.byteLength).toBeGreaterThan(0)
+  })
+})

lib/exporter/zip.ts

@@ -14,8 +14,19 @@ export async function buildZip(input: BuildZipInput): Promise<Uint8Array> {
   zip.file('index.html', input.html)
   zip.file('styles.css', input.css)
   zip.file('app.js', input.js)
+
+  // guard: basic path sanitizer to avoid directory traversal or absolute paths
+  const isSafePath = (p: string) => {
+    if (!p || typeof p !== 'string') return false
+    if (p.startsWith('/')) return false
+    if (p.includes('..')) return false
+    if (p.includes('\\')) return false
+    return true
+  }
+
   if (input.assets) {
     for (const [path, bytes] of Object.entries(input.assets)) {
+      if (!isSafePath(path)) throw new Error(`Invalid asset path: ${path}`)
       // In Node/Vitest, use Buffer for robust binary handling
       const buf = Buffer.from(bytes)
       zip.file(path, buf as unknown as Buffer)
@@ -33,6 +44,7 @@ export async function buildZip(input: BuildZipInput): Promise<Uint8Array> {
       }
     }
     for (const [path, bytes] of Object.entries(input.extras)) {
+      if (!isSafePath(path)) throw new Error(`Invalid extra path: ${path}`)
       const buf = Buffer.from(bytes)
       zip.file(path, buf as unknown as Buffer)
     }

메인플랜.md

@@ -0,0 +1,42 @@
+# 메인플랜
+
+## 목표
+- Export ZIP 무결성 강화(Option2): 자산 무결성 지표와 번들 검증 체계 구축
+- CI/CD(Gitea)에서 PR 자동화, 라벨링, 조건부 머지 적용
+- 모든 개발은 TDD로 진행하고, 기능 단위 커밋/대브랜치 단위 푸쉬
+
+## 브랜치 전략
+- 대범위 기능 묶음 브랜치: `feat/export-bundle-integrity`
+- 관련 기능 완료까지 로컬 커밋만 진행, 완료 시점에 일괄 푸쉬
+
+## 진행 현황
+- SHA-256(base64) 무결성 구현 및 `assets.integrity.index.json` 생성
+- `assets.index.json` 그룹 정렬/경로 전략(grouped/flat) 커버리지 확장
+- `referencedAt` 추적(HTML 내 `rewriteUrl('local:...')`) 매트릭스 테스트
+- `verifyIntegrity` 유틸 구현 및 TDD(정상/변조/누락/번들해시 불일치) 통과
+- Export Options(폰트 프리커넥트/프리로드, 이미지 로딩/디코딩, robots 메타) UI/문서화
+- 브랜치 푸쉬 완료: `feat/export-bundle-integrity`
+
+## TDD 계획 및 상태
+- 테스트 선작성 → 최소 구현 → 리팩터/문서화
+- 현재 테스트: 110 files / 173 tests 모두 통과
+- 무결성 인덱스/검증에 대한 정상/오류 케이스 커버 완료
+
+## 오류/디버깅 로그 요약
+- 그룹 경로(other) 정규식 기대값 수정으로 테스트 안정화
+- SHA-256 재계산 불일치 회피: 테스트에서 중복 해시 구현 제거, 산출물 기준 비교
+- Node/브라우저 호환 btoa/atob 제거, 안전한 변환 로직 적용
+
+## 다음 작업
+1) PR 생성(템플릿/라벨): `feat/export-bundle-integrity` → `main`
+2) CI 무결성 검증 스텝 추가: `verifyIntegrity`로 빌드 산출물 검사
+3) PR 라벨 자동화 및 조건부 머지(Gitea Actions/웹훅)
+4) README에 사용 가이드 보완(verifyIntegrity 활용 예시)
+
+## CI/CD 계획(초안)
+- PR 오픈 시: 라벨 자동 지정, 테스트/빌드, 무결성 검증 스텝 실행
+- main 머지 조건: 테스트/빌드 통과 + 무결성 검증 통과 + 최소 라벨 셋 충족
+
+## 커밋/푸쉬 원칙
+- 기능 단위 커밋은 한국어 메시지
+- 대범위 브랜치 완료 전에 푸쉬 금지(현 단계는 완료되어 푸쉬 수행)