feat: Imagen → Gemini Flash Image (gemini-2.5-flash-image)
- Gemini kann Image-to-Image (Cover+Landschaft), Imagen nur Text - generateContent statt predict, inlineData statt rawBytes - PNG-Output, optionale PIL-Konvertierung zu JPEG - image_base64 als Referenzbild im contents[].parts[] - Getestet: Text-to-Image + Image-to-Image
This commit is contained in:
Hermes Agent
+53
-47
@@ -66,26 +66,20 @@ MONTHS = {
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"September": 9, "Oktober": 10, "November": 11, "Dezember": 12
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}
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# ── Google Imagen API Configuration ────────────────────────────────────────
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IMAGEN_API_URL = (
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# ── Gemini Flash Image API Configuration ────────────────────────────────────
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GEMINI_IMAGE_MODEL = "gemini-2.5-flash-image"
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GEMINI_API_URL = (
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"https://generativelanguage.googleapis.com/v1beta/"
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"models/imagen-4.0-generate-001:predict"
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"models/" + GEMINI_IMAGE_MODEL + ":generateContent"
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)
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IMAGEN_KEY_SECRET = "bsn/google-imagen-key"
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# Resolution Mapping (Imagen 4.0 verwendet 1K/2K direkt)
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IMAGEN_SIZE_MAP = {
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"1K": "1K",
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"2K": "2K",
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"4K": "2K", # 4K nicht unterstützt → falle zurück auf 2K
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}
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GEMINI_KEY_SECRET = "bsn/google-imagen-key"
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def _get_imagen_key() -> str:
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"""Google Imagen API-Key aus bsn-secrets lesen."""
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def _get_gemini_key() -> str:
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"""Google Gemini API-Key aus bsn-secrets lesen."""
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try:
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r = subprocess.run(
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["/home/hermes/bin/bsn-secrets", "get", IMAGEN_KEY_SECRET],
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["/home/hermes/bin/bsn-secrets", "get", GEMINI_KEY_SECRET],
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capture_output=True, text=True, timeout=5
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)
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return r.stdout.strip()
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@@ -93,44 +87,57 @@ def _get_imagen_key() -> str:
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return ""
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def _imagen_generate(
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def _gemini_generate_image(
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prompt: str,
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image_base64: str | None,
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aspect_ratio: str,
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resolution: str
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) -> dict:
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"""Google Imagen aufrufen — synchron, liefert Base64-Bild direkt zurück.
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"""Gemini Flash Image aufrufen — Text-to-Image und Image-to-Image.
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Args:
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prompt: Text-Prompt für die Bildgenerierung.
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prompt: Text-Prompt.
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image_base64: Optionales Referenzbild als Base64 (Image-to-Image).
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aspect_ratio: Seitenverhältnis (z.B. "16:9").
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resolution: Auflösung ("1K", "2K", "4K").
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resolution: Behält Kompatibilität (von Gemini ignoriert).
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Returns:
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dict mit "image_base64" (PNG) oder "error".
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"""
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key = _get_imagen_key()
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key = _get_gemini_key()
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if not key:
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return {"error": "Kein Google Imagen API-Key"}
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return {"error": "Kein Gemini API-Key"}
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instance = {"prompt": prompt}
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parts = [{"text": f"{prompt}\n\nAspect ratio: {aspect_ratio}."}]
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if image_base64:
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instance["rawBytes"] = image_base64
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parts.append({
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"inlineData": {
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"mimeType": "image/jpeg",
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"data": image_base64
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}
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})
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body = json.dumps({
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"instances": [instance],
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"parameters": {
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"sampleCount": 1,
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"aspectRatio": aspect_ratio,
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"sampleImageSize": IMAGEN_SIZE_MAP.get(resolution, "2K"),
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"contents": [{"parts": parts}],
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"generationConfig": {
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"responseModalities": ["image", "text"]
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}
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}).encode()
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req = urllib.request.Request(IMAGEN_API_URL, data=body, method="POST")
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req = urllib.request.Request(GEMINI_API_URL, data=body, method="POST")
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req.add_header("x-goog-api-key", key)
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req.add_header("Content-Type", "application/json")
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try:
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with urllib.request.urlopen(req, timeout=30) as resp:
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return json.loads(resp.read())
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with urllib.request.urlopen(req, timeout=45) as resp:
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result = json.loads(resp.read())
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candidates = result.get("candidates") or []
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for cand in candidates:
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for part in cand.get("content", {}).get("parts", []):
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inline = part.get("inlineData")
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if inline and inline.get("data"):
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return {"image_base64": inline["data"]}
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return {"error": "Kein Bild in Gemini-Antwort"}
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except urllib.error.HTTPError as e:
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return {"error": f"HTTP {e.code}: {e.read().decode()[:300]}"}
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@@ -1031,46 +1038,45 @@ h1{color:#c0392b;}p{color:#888;}</style></head>
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self._json_reply(400, {"ok": False, "error": "Prompt fehlt"})
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return
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# Google Imagen aufrufen (synchron!)
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result = _imagen_generate(prompt, image_base64, aspect_ratio, resolution)
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# Gemini Flash Image aufrufen (synchron!)
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result = _gemini_generate_image(prompt, image_base64, aspect_ratio, resolution)
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if "error" in result:
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self._json_reply(500, {"ok": False, "error": result["error"]})
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return
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# Base64-Bild extrahieren
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predictions = result.get("predictions") or []
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if not predictions:
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self._json_reply(500, {"ok": False, "error": "Kein Bild in Imagen-Antwort"})
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return
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b64_data = predictions[0].get("bytesBase64Encoded", "")
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# Base64-Bild (PNG) dekodieren
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b64_data = result.get("image_base64", "")
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if not b64_data:
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self._json_reply(500, {"ok": False, "error": "Leeres Base64-Bild"})
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self._json_reply(500, {"ok": False, "error": "Leeres Bild von Gemini"})
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return
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img_bytes = b64.b64decode(b64_data)
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# Im media-Ordner speichern (wie normale Uploads)
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# Im media-Ordner speichern
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now = datetime.now()
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month_dir = os.path.join(MEDIA_DIR, now.strftime("%Y"), now.strftime("%m"))
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os.makedirs(month_dir, exist_ok=True)
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filename = f"imagen_{now.strftime('%H%M%S')}.jpg"
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filepath = os.path.join(month_dir, filename)
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base_name = f"gemini_{now.strftime('%H%M%S')}"
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ext = ".png" # Gemini liefert PNG
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filepath = os.path.join(month_dir, base_name + ext)
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with open(filepath, "wb") as f:
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f.write(img_bytes)
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# Optional: PIL-Normalisierung auf 1920x1080 @ 72 DPI
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# Optional: PIL-Konvertierung zu JPEG (1920x1080 @ 72 DPI)
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try:
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from PIL import Image
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img = Image.open(filepath)
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img = img.convert("RGB")
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img = img.resize((1920, 1080), Image.LANCZOS)
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img.save(filepath, "JPEG", dpi=(72, 72), quality=92)
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jpg_path = os.path.join(month_dir, base_name + ".jpg")
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img.save(jpg_path, "JPEG", dpi=(72, 72), quality=92)
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filepath = jpg_path
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ext = ".jpg"
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except Exception:
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pass # Original behalten wenn PIL fehlschlägt
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pass # PNG behalten wenn PIL fehlschlägt
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img_url = f"/media/{now.strftime('%Y')}/{now.strftime('%m')}/{filename}?key={ACCESS_TOKEN}"
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img_url = f"/media/{now.strftime('%Y')}/{now.strftime('%m')}/{base_name}{ext}?key={ACCESS_TOKEN}"
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self._json_reply(200, {
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"ok": True,
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"imageUrl": img_url,
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