Function _extract_generation_params

src/core/model_resolver.py:406–613

从请求中提取 aspectRatio 和 imageSize 参数。 优先级： 1. request.generationConfig.imageConfig (顶层 Gemini 参数) 2. extra fields 中的 generationConfig (extra_body 透传) 3. OpenAI 风格字段（size/quality）兼容：可在 generationConfig/imageConfig 或顶层 extra 中出现 Returns: (aspect_ratio, image_size) 归一化后的值

(request)

def _extract_generation_params(request) -> Tuple[Optional[str], Optional[str]]:
    """从请求中提取 aspectRatio 和 imageSize 参数。

    优先级：
    1. request.generationConfig.imageConfig (顶层 Gemini 参数)
    2. extra fields 中的 generationConfig (extra_body 透传)
    3. OpenAI 风格字段（size/quality）兼容：可在 generationConfig/imageConfig 或顶层 extra 中出现

    Returns:
        (aspect_ratio, image_size) 归一化后的值
    """
    def _normalize_str(value: Any) -> Optional[str]:
        if not isinstance(value, str):
            return None
        text = value.strip()
        return text if text else None

    def _read_value(obj: Any, *keys: str) -> Any:
        if obj is None:
            return None
        if isinstance(obj, dict):
            for key in keys:
                if key in obj:
                    return obj.get(key)
            return None

        for key in keys:
            if hasattr(obj, key):
                value = getattr(obj, key, None)
                if value is not None:
                    return value

        extra = getattr(obj, "__pydantic_extra__", None) or {}
        for key in keys:
            if key in extra:
                return extra.get(key)
        return None

    def _normalize_aspect_ratio(value: Any) -> Optional[str]:
        raw = _normalize_str(value)
        if not raw:
            return None

        token = (
            raw.replace("：", ":")
            .replace("/", ":")
            .replace("x", ":")
            .replace("X", ":")
            .replace(" ", "")
            .strip()
        )

        mapped = ASPECT_RATIO_MAP.get(token)
        if mapped:
            return mapped
        mapped = ASPECT_RATIO_MAP.get(token.lower())
        if mapped:
            return mapped