feat(wordpress): upload selected image and set featured_media on draft publish

backend/app/wordpress.py

@@ -2,7 +2,10 @@ from __future__ import annotations
 
 import base64
 import json
+import mimetypes
+from pathlib import Path
 from typing import Any
+from urllib.parse import urlparse
 from urllib.request import Request, urlopen
 
 from .config import get_settings
@@ -56,6 +59,77 @@ def _selected_image_url_from_meta(meta_json: str | None) -> str | None:
     return selected if isinstance(selected, str) and selected.strip() else None
 
 
+def _download_image_bytes(url: str) -> tuple[bytes, str]:
+    req = Request(
+        url=url,
+        headers={
+            "User-Agent": "rss-news-publisher/1.0",
+            "Accept": "image/avif,image/webp,image/apng,image/*,*/*;q=0.8",
+        },
+    )
+    with urlopen(req, timeout=20) as resp:
+        raw = resp.read()
+        content_type = resp.headers.get("Content-Type", "application/octet-stream")
+    if not content_type.lower().startswith("image/"):
+        raise RuntimeError(f"Ausgewählte Bild-URL liefert kein Bild ({content_type})")
+    return raw, content_type
+
+
+def _guess_filename(image_url: str, content_type: str) -> str:
+    parsed = urlparse(image_url)
+    stem = Path(parsed.path).name or "article-image"
+    if "." not in stem:
+        ext = mimetypes.guess_extension(content_type.split(";")[0].strip()) or ".jpg"
+        stem = f"{stem}{ext}"
+    return stem
+
+
+def _upload_featured_media(
+    *,
+    base_url: str,
+    auth_header: str,
+    image_url: str,
+    article_title: str,
+    source_url: str,
+) -> int:
+    image_bytes, content_type = _download_image_bytes(image_url)
+    filename = _guess_filename(image_url, content_type)
+
+    media_url = f"{base_url.rstrip('/')}/wp-json/wp/v2/media"
+    media_req = Request(
+        url=media_url,
+        data=image_bytes,
+        method="POST",
+        headers={
+            "Authorization": auth_header,
+            "Content-Type": content_type,
+            "Content-Disposition": f'attachment; filename="{filename}"',
+            "Accept": "application/json",
+            "User-Agent": "rss-news-publisher/1.0",
+        },
+    )
+    with urlopen(media_req, timeout=30) as resp:
+        media_raw = resp.read().decode("utf-8", errors="replace")
+    media_payload = json.loads(media_raw) if media_raw else {}
+    media_id = int(media_payload.get("id", 0)) if isinstance(media_payload, dict) else 0
+    if media_id <= 0:
+        raise RuntimeError(f"WordPress Media-Upload fehlgeschlagen: {media_payload}")
+
+    # Optional metadata update for traceability.
+    _wp_request(
+        base_url=base_url,
+        auth_header=auth_header,
+        method="POST",
+        endpoint=f"media/{media_id}",
+        payload={
+            "title": f"{article_title[:120]} - Bild",
+            "caption": f"Quelle: {source_url}",
+            "alt_text": article_title[:200],
+        },
+    )
+    return media_id
+
+
 def publish_article_draft(article: dict[str, Any]) -> tuple[int, str | None]:
     settings = get_settings()
     if not settings.wordpress_base_url or not settings.wordpress_username or not settings.wordpress_app_password:
@@ -76,11 +150,24 @@ def publish_article_draft(article: dict[str, Any]) -> tuple[int, str | None]:
         footer += f"\n<p><strong>Canonical:</strong> <a href=\"{canonical_url}\">{canonical_url}</a></p>"
     content = f"{body}{footer}"
 
+    featured_media_id = None
+    selected_image_url = _selected_image_url_from_meta(article.get("meta_json"))
+    if selected_image_url:
+        featured_media_id = _upload_featured_media(
+            base_url=settings.wordpress_base_url,
+            auth_header=auth,
+            image_url=selected_image_url,
+            article_title=title,
+            source_url=source_url,
+        )
+
     payload = {
         "title": title,
         "content": content,
         "status": settings.wordpress_default_status,
     }
+    if featured_media_id:
+        payload["featured_media"] = featured_media_id
 
     wp_post_id = article.get("wp_post_id")
     if wp_post_id: