feat(workflow): simplify article flow and add automated rewrite step

backend/app/rewrite.py

@@ -0,0 +1,83 @@
+from __future__ import annotations
+
+import json
+import re
+from typing import Any
+from urllib.request import Request, urlopen
+
+from .config import get_settings
+
+
+def _sanitize_source_text(text: str) -> str:
+    raw = (text or "").strip()
+    if not raw:
+        return ""
+
+    lines = [ln.strip() for ln in raw.splitlines() if ln.strip()]
+    if len(lines) > 3:
+        lines = lines[3:]
+
+    joined = "\n".join(lines)
+    # Remove press contact block at end from "Pressekontakt" onward.
+    joined = re.sub(
+        r"\n?\s*Pressekontakt[\s\S]*$",
+        "",
+        joined,
+        flags=re.IGNORECASE,
+    ).strip()
+    return joined
+
+
+def rewrite_article_text(article: dict[str, Any]) -> str:
+    settings = get_settings()
+    api_key = settings.openai_api_key
+    if not api_key:
+        raise RuntimeError("OPENAI_API_KEY fehlt")
+
+    source_text = _sanitize_source_text(article.get("content_raw") or "")
+    if not source_text:
+        source_text = (article.get("summary") or "").strip()
+    if not source_text:
+        raise RuntimeError("Kein Quelltext für Rewrite verfügbar")
+
+    title = (article.get("title") or "").strip()
+    prompt = (
+        "Schreibe den folgenden News-Text neu auf Deutsch in persönlicher Du-Form. "
+        "Stil: ausführlich, gut lesbar, ohne Einleitung mit Datum/Uhrzeit/Firma/Ort, "
+        "ohne Pressekontakt, ohne Quellenblock. "
+        "Nutze klare Absätze und Zwischenüberschriften in HTML (<h2>, <p>, <ul><li> falls passend). "
+        "Inhaltlich korrekt bleiben, nichts erfinden.\n\n"
+        f"Titel: {title}\n\n"
+        f"Originaltext:\n{source_text}"
+    )
+
+    payload = {
+        "model": settings.openai_model,
+        "temperature": 0.4,
+        "messages": [
+            {"role": "system", "content": "Du bist ein deutscher News-Redakteur."},
+            {"role": "user", "content": prompt},
+        ],
+    }
+    req = Request(
+        url="https://api.openai.com/v1/chat/completions",
+        method="POST",
+        data=json.dumps(payload).encode("utf-8"),
+        headers={
+            "Authorization": f"Bearer {api_key}",
+            "Content-Type": "application/json",
+            "Accept": "application/json",
+        },
+    )
+    with urlopen(req, timeout=60) as resp:
+        raw = resp.read().decode("utf-8", errors="replace")
+    data = json.loads(raw)
+    choices = data.get("choices")
+    if not isinstance(choices, list) or not choices:
+        raise RuntimeError(f"Ungültige OpenAI-Antwort: {data}")
+    message = choices[0].get("message", {})
+    content = message.get("content")
+    if not isinstance(content, str) or not content.strip():
+        raise RuntimeError("OpenAI lieferte keinen Rewrite-Text")
+    return content.strip()
+