Keep Daangn jobs detail resilient

Add an HTML metadata fallback because the public jobs detail _data route currently returns an empty response while the redirected public page still exposes read-only title/meta data.

Constraint: PR 237 must remain read-only and avoid proxy/auth additions for public Daangn surfaces
Rejected: Treating the 204 _data response as acceptable | it breaks the documented detail command
Confidence: high
Scope-risk: narrow
Directive: Keep Daangn jobs detail on public HTML/meta fallback unless a stable JSON detail surface is verified
Tested: npm run ci; live daangn_jobs.py search/detail smoke
Not-tested: authenticated or interactive Daangn actions, intentionally out of scope

daangn-jobs-search/SKILL.md

@@ -38,7 +38,7 @@ metadata:
 
 - Region resolver: `https://www.daangn.com/kr/api/v1/regions/keyword?keyword=<지역명>`
 - Search `_data`: `/kr/jobs/?in=<지역명>-<id>&search=<keyword>&_data=routes/kr.jobs._index`
-- Detail `_data`: `<job-url>?_data=routes%2Fkr.jobs.%24job_post_id`
+- Detail fallback: `<job-url>` redirects to `jobs.daangn.com/job-posts/<id>` and exposes public HTML title/meta/JSON-LD. The helper first tries the legacy `_data` route and falls back to HTML meta when that route returns an empty response.
 
 ## Workflow
 
@@ -58,7 +58,7 @@ python3 daangn-jobs-search/scripts/daangn_jobs.py detail "https://www.daangn.com
 ## Output fields
 
 - title, company, region, address, salary, salaryType, workDays, workTimeStart, workTimeEnd, closed, url
-- detail: jobPost 원문
+- detail: `jobPost` 원문 if the `_data` route is available; otherwise public page `title`, `meta`, and `json_ld`
 
 ## Region handling
 

daangn-jobs-search/scripts/daangn_jobs.py

@@ -7,7 +7,10 @@ HEADERS = {"User-Agent":"Mozilla/5.0", "Accept":"application/json,text/html;q=0.
 def fetch_json(url):
     req = urllib.request.Request(url, headers=HEADERS)
     with urllib.request.urlopen(req, timeout=25) as r:
-        return json.load(r)
+        body = r.read()
+        if not body:
+            raise ValueError(f'빈 JSON 응답: {url}')
+        return json.loads(body)
 
 def fetch_text(url):
     req = urllib.request.Request(url, headers={"User-Agent":"Mozilla/5.0", "Accept":"text/html"})
@@ -42,6 +45,27 @@ def absolute(href):
 def print_json(obj):
     print(json.dumps(obj, ensure_ascii=False, indent=2))
 
+def parse_html_detail(url):
+    html = fetch_text(url)
+    title = re.search(r'<title>(.*?)</title>', html, re.S)
+    meta = {}
+    for m in re.finditer(r'<meta[^>]+(?:property|name)=["\']([^"\']+)["\'][^>]+content=["\']([^"\']*)["\']', html):
+        key, value = m.group(1), unescape(m.group(2)).strip()
+        if key in ('description', 'og:title', 'og:description', 'og:image'):
+            meta[key] = value
+    json_ld = []
+    for m in re.finditer(r'<script[^>]*type=["\']application/ld\+json["\'][^>]*>(.*?)</script>', html, re.S):
+        try:
+            json_ld.append(json.loads(unescape(m.group(1))))
+        except Exception:
+            pass
+    return {
+        'source': url,
+        'title': unescape(title.group(1)).strip() if title else meta.get('og:title'),
+        'meta': meta,
+        'json_ld': json_ld[:3],
+    }
+
 
 def cmd_search(args):
     sel=resolve_region(args.region) if args.region else None
@@ -59,7 +83,13 @@ def cmd_search(args):
 
 def cmd_detail(args):
     u=args.url.rstrip('/')+'/?_data=routes%2Fkr.jobs.%24job_post_id'
-    data=fetch_json(u); print_json({'source':u,'jobPost':data.get('jobPost') or data})
+    try:
+        data=fetch_json(u)
+        print_json({'source':u,'jobPost':data.get('jobPost') or data})
+    except Exception:
+        detail = parse_html_detail(args.url)
+        detail['data_source_attempted'] = u
+        print_json(detail)
 
 p=argparse.ArgumentParser(description='Daangn jobs read-only search/detail')
 sub=p.add_subparsers(dest='cmd', required=True)

docs/features/daangn-jobs-search.md

@@ -14,7 +14,7 @@
 
 1. 지역 해석: `https://www.daangn.com/kr/api/v1/regions/keyword?keyword=<지역명>`
 2. 검색: `https://www.daangn.com/kr/jobs/?in=<지역명>-<id>&search=<키워드>&_data=routes/kr.jobs._index`
-3. 상세: `<공고 URL>?_data=routes%2Fkr.jobs.%24job_post_id`
+3. 상세: `<공고 URL>` → `jobs.daangn.com/job-posts/<id>` 공개 HTML의 title/meta/JSON-LD(헬퍼는 legacy `_data`를 먼저 시도 후 빈 응답이면 HTML 메타로 fallback)
 
 ## 로컬 실행
 
@@ -33,7 +33,7 @@ python3 daangn-jobs-search/scripts/daangn_jobs.py detail "https://www.daangn.com
 
 ## 출력 해석
 
-검색 결과는 `title`, `company`, `region`, `address`, `salary`, `salaryType`, `workDays`, `workTimeStart`, `workTimeEnd`, `closed`, `url`을 우선 확인합니다. 지원 가능 여부나 근무 조건은 상세 조회의 `jobPost` 원문까지 본 뒤 정리합니다.
+검색 결과는 `title`, `company`, `region`, `address`, `salary`, `salaryType`, `workDays`, `workTimeStart`, `workTimeEnd`, `closed`, `url`을 우선 확인합니다. 상세 조회는 가능하면 `jobPost` 원문을 사용하고, 공개 `_data`가 빈 응답이면 HTML title/meta/JSON-LD를 근거로 정리합니다.
 
 ## 제한사항