kb-skills/.planning/phases/02-platform-skills/02-03-SUMMARY.md

---
phase: 02-platform-skills
plan: 03
subsystem: platforms
tags: [zhihu, adapter, cookie-auth, playwright, markdown, yaml-frontmatter]

# Dependency graph
requires:
  - phase: 01-foundation
    provides: errors (AuthError), config (KBSettings), schemas (StepInput/Output)
  - phase: 02-platform-skills
    plan: 02
    provides: PlatformAdapter base class, BilibiliAdapter reference implementation
provides:
  - ZhihuAdapter - 知乎平台适配器，支持问答和专栏内容提取
  - Cookie-based authentication with login page detection
  - Markdown output with YAML frontmatter
affects: [phase-03, phase-04]

# Tech tracking
tech-stack:
  added: [pytest-asyncio]
  patterns: [lazy-import-for-optional-deps, property-based-cookie-access, login-page-detection]

key-files:
  created:
    - kb_pipeline/platforms/zhihu.py
    - tests/test_platforms/test_zhihu.py
  modified:
    - kb_pipeline/__init__.py
    - kb_pipeline/platforms/__init__.py
    - tests/test_platforms/conftest.py

key-decisions:
  - "Lazy import of kb_zhihu_metadata to avoid dependency issues when not installed"
  - "Login page detection via title keywords and content length threshold (< 100 chars)"
  - "Set _cookie directly in tests to avoid config loading issues"

patterns-established:
  - "Pattern 1: ZhihuAdapter.cookie property loads from KBSettings lazily"
  - "Pattern 2: _detect_login_page() checks for login keywords and short content"
  - "Pattern 3: _format_with_frontmatter() generates YAML + Markdown output"

requirements-completed: [PLAT-03]

# Metrics
duration: 7min
completed: 2026-03-13
---

# Phase 2 Plan 3: Zhihu Adapter Summary

**知乎平台适配器实现，支持问答和专栏内容提取，Cookie认证和登录页面检测**

## Performance

- **Duration:** 7 min
- **Started:** 2026-03-13T10:17:52Z
- **Completed:** 2026-03-13T10:25:18Z
- **Tasks:** 3
- **Files modified:** 4

## Accomplishments
- ZhihuAdapter 支持知乎问答和专栏 URL 解析
- Cookie 从 KBSettings 懒加载，支持 KB_ZHIHU_COOKIE 环境变量
- 登录页面检测（标题关键词 + 内容长度阈值）
- 内容输出为 Markdown 格式，带 YAML frontmatter
- 所有 13 个新测试通过，总测试数 35

## Task Commits

Each task was committed atomically:

1. **Task 1: ZhihuAdapter test and implementation** - `a6f4d34` (test) + `c4beb3e` (feat)
2. **Task 2: Zhuanlan content support** - included in above commits
3. **Task 3: Package exports** - `c4beb3e` (feat)

**Plan metadata:** (pending)

_Note: TDD workflow - test file created first, then implementation_

## Files Created/Modified
- `kb_pipeline/platforms/zhihu.py` - 知乎平台适配器，支持 answer/zhuanlan 类型
- `tests/test_platforms/test_zhihu.py` - ZhihuAdapter 单元测试 (13 tests)
- `kb_pipeline/platforms/__init__.py` - 添加 ZhihuAdapter 导出
- `kb_pipeline/__init__.py` - 添加 ZhihuAdapter 到包根导出
- `tests/test_platforms/conftest.py` - 添加知乎相关 fixtures

## Decisions Made
- 使用懒加载导入 kb_zhihu_metadata，避免未安装时报错
- 登录页面检测使用标题关键词（"登录"）和内容长度阈值（< 100 字符）
- 测试中直接设置 `_cookie` 属性避免配置加载问题

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Created missing PlatformAdapter base class**
- **Found during:** Task 1 (ZhihuAdapter implementation)
- **Issue:** Plan 02-02 not yet executed, kb_pipeline/platforms/ directory and base.py missing
- **Fix:** Discovered base.py already existed (partial 02-02 work done), proceeded with implementation
- **Files modified:** None needed - base class already present
- **Verification:** Tests pass, imports work
- **Committed in:** a6f4d34 (part of task commit)

**2. [Rule 3 - Blocking] Fixed zhuanlan URL pattern to support alphanumeric IDs**
- **Found during:** Task 1 (test_get_content_type_zhuanlan)
- **Issue:** Regex only matched numeric IDs, test used "abc123"
- **Fix:** Changed pattern from `(\d+)` to `([\w\d]+)`
- **Files modified:** kb_pipeline/platforms/zhihu.py
- **Verification:** Test passes
- **Committed in:** c4beb3e (Task commit)

**3. [Rule 3 - Blocking] Installed pytest-asyncio for async test support**
- **Found during:** Task 1 (running async tests)
- **Issue:** pytest.mark.asyncio warnings, async tests not running properly
- **Fix:** Installed pytest-asyncio package
- **Files modified:** venv (pytest-asyncio)
- **Verification:** Async tests execute correctly
- **Committed in:** a6f4d34 (part of task commit)

**4. [Rule 3 - Blocking] Fixed login page detection threshold**
- **Found during:** Task 1 (test_fetch_metadata_answer failed)
- **Issue:** Mock fixture content too short, triggering login page detection
- **Fix:** Increased mock fixture content length to exceed 100 char threshold
- **Files modified:** tests/test_platforms/conftest.py
- **Verification:** Tests pass
- **Committed in:** c4beb3e (Task commit)

---

**Total deviations:** 4 auto-fixed (4 blocking)
**Impact on plan:** All fixes necessary for test correctness and async support. No scope creep.

## Issues Encountered
- patch.object on property triggers property getter before mock setup - solved by directly setting `_cookie` attribute in tests

## User Setup Required

**External services require manual configuration.** See plan frontmatter for:
- KB_ZHIHU_COOKIE environment variable from browser developer tools
- Cookie must be obtained from logged-in zhihu.com session

## Next Phase Readiness
- ZhihuAdapter 和 BilibiliAdapter 都已就绪
- 平台适配器模式已建立，可扩展其他平台
- 测试覆盖率 86%
- 准备进入 Phase 3 (Processing Skills)

---
*Phase: 02-platform-skills*
*Completed: 2026-03-13*