""" 统一的 Provider 请求构建工具。 负责: - 根据 API 格式或端点配置生成请求 URL - URL 脱敏(用于日志记录) - Provider transport hook 路由 """ from __future__ import annotations import re from typing import TYPE_CHECKING, Any, Callable from urllib.parse import urlencode, urlparse from src.core.api_format import ( EndpointKind, get_default_path_for_endpoint, make_signature_key, ) from src.core.logger import logger from src.core.provider_types import ProviderType, normalize_provider_type from src.services.provider.format import normalize_endpoint_signature from src.services.provider.provider_context import resolve_provider_type from src.services.provider.request_context import ( get_selected_base_url, set_selected_base_url, ) from src.utils.url_utils import is_codex_url if TYPE_CHECKING: from src.models.database import ProviderAPIKey, ProviderEndpoint # --------------------------------------------------------------------------- # Transport Hook Registry # --------------------------------------------------------------------------- # key: (provider_type, endpoint_sig) # value: Callable(endpoint, *, is_stream, effective_query_params) -> str _TransportHookFn = Callable[..., str] _transport_hooks: dict[tuple[str, str], _TransportHookFn] = {} def register_transport_hook( provider_type: str, endpoint_sig: str, hook: _TransportHookFn, ) -> None: """注册 provider 特有的 URL 构建 hook。""" pt = normalize_provider_type(provider_type) sig = str(endpoint_sig or "").strip().lower() _transport_hooks[(pt, sig)] = hook # URL 中需要脱敏的查询参数(正则模式) _SENSITIVE_QUERY_PARAMS_PATTERN = re.compile( r"([?&])(key|api_key|apikey|token|secret|password|credential)=([^&]*)", re.IGNORECASE, ) def redact_url_for_log(url: str) -> str: """ 对 URL 中的敏感查询参数进行脱敏,用于日志记录 将 ?key=xxx 替换为 ?key=*** Args: url: 原始 URL Returns: 脱敏后的 URL """ return _SENSITIVE_QUERY_PARAMS_PATTERN.sub(r"\1\2=***", url) # Vertex AI host 白名单:aiplatform.googleapis.com 及其区域子域名 _VERTEX_AI_HOST = "aiplatform.googleapis.com" _VERTEX_AI_ENDPOINT_SIGS = {"gemini:chat", "claude:chat"} _VERTEX_AI_AUTH_TYPES = {"api_key", "service_account", "vertex_ai"} def looks_like_vertex_ai_host( base_url: str, endpoint_sig: str = "", auth_type: str = "", ) -> bool: """根据 base_url + endpoint_sig/auth_type 判断是否属于 Vertex AI。 用于历史数据兼容:部分旧记录缺少 provider_type,但 base_url 已固定到 aiplatform。 """ try: host = (urlparse(base_url).netloc or "").strip().lower() except Exception: return False if not host: return False if host != _VERTEX_AI_HOST and not host.endswith(f".{_VERTEX_AI_HOST}"): return False sig = endpoint_sig.strip().lower() at = auth_type.strip().lower() return sig in _VERTEX_AI_ENDPOINT_SIGS or at in _VERTEX_AI_AUTH_TYPES def _normalize_base_url(base_url: str, path: str) -> str: """ 规范化 base_url,去除末尾的斜杠和可能与 path 重复的版本前缀。 只有当 path 以版本前缀开头时,才从 base_url 中移除该前缀, 避免拼接出 /v1/v1/messages 这样的重复路径。 兼容用户填写的各种格式: - https://api.example.com - https://api.example.com/ - https://api.example.com/v1 - https://api.example.com/v1/ """ base = base_url.rstrip("/") # 只在 path 以版本前缀开头时才去除 base_url 中的该前缀 # 例如:base="/v1", path="/v1/messages" -> 去除 /v1 # 例如:base="/v1", path="/chat/completions" -> 不去除(用户可能期望保留) for suffix in ("/v1beta", "/v1", "/v2", "/v3"): if base.endswith(suffix) and path.startswith(suffix): base = base[: -len(suffix)] break return base def get_antigravity_base_url() -> str | None: """Backward-compat alias for `get_selected_base_url()`.""" return get_selected_base_url() def _get_provider_type( endpoint: Any, key: "ProviderAPIKey" | None = None, decrypted_auth_config: dict[str, Any] | None = None, ) -> str | None: """尽力获取 Provider.provider_type(用于 Antigravity 等 Provider 特判)。 优先级: 1. endpoint.provider_type(如果调用方已做扁平化注入) 2. key.provider.provider_type 3. decrypted_auth_config["provider_type"](OAuth 导入的凭证) 4. provider_id 对应的 Provider 记录 """ resolved = resolve_provider_type( endpoint=endpoint, key=key, decrypted_auth_config=decrypted_auth_config, ) if resolved: return resolved # Fallback: 历史 Vertex 数据可能缺少 provider_type,但 base_url 已固定到 aiplatform。 try: base_url = str(getattr(endpoint, "base_url", "") or "").strip() endpoint_sig = str(getattr(endpoint, "api_format", "") or "").strip() auth_type = str(getattr(key, "auth_type", "") or "").strip() if key else "" if base_url and looks_like_vertex_ai_host(base_url, endpoint_sig, auth_type): return ProviderType.VERTEX_AI.value except Exception: pass return None def build_provider_url( endpoint: ProviderEndpoint, *, query_params: dict[str, Any] | None = None, path_params: dict[str, Any] | None = None, is_stream: bool = False, key: "ProviderAPIKey" | None = None, decrypted_auth_config: dict[str, Any] | None = None, ) -> str: """ 根据 endpoint 配置生成请求 URL 优先级: 1. Provider transport hook - 如有注册的 hook 则委托处理 2. endpoint.custom_path - 自定义路径(支持模板变量如 {model}) 3. API 格式默认路径 - 根据 api_format 自动选择 Args: endpoint: 端点配置 query_params: 查询参数 path_params: 路径模板参数 (如 {model}) is_stream: 是否为流式请求,用于 Gemini API 选择正确的操作方法 key: Provider API Key(用于 Vertex AI 等需要从密钥配置读取信息的场景) decrypted_auth_config: 已解密的认证配置(避免重复解密,由 get_provider_auth 提供) """ # 默认清理,避免上一次请求的 selected_base_url 泄漏到其他请求 set_selected_base_url(None) # endpoint signature(新模式) raw_family = getattr(endpoint, "api_family", None) raw_kind = getattr(endpoint, "endpoint_kind", None) endpoint_sig = "" if isinstance(raw_family, str) and isinstance(raw_kind, str) and raw_family and raw_kind: endpoint_sig = make_signature_key(raw_family, raw_kind) else: # 兜底:允许 api_format 已直接存 signature key 的情况 raw_format = getattr(endpoint, "api_format", None) if isinstance(raw_format, str) and ":" in raw_format: endpoint_sig = raw_format # endpoint_sig 为空时保持为空(更安全:默认路径回退到 "/",避免误判为 claude:chat) endpoint_sig = normalize_endpoint_signature(endpoint_sig) if endpoint_sig else "" provider_type = _get_provider_type(endpoint, key, decrypted_auth_config) # 合并查询参数(部分逻辑需要先拿到 query_params) effective_query_params = dict(query_params) if query_params else {} # Gemini family 下清除可能存在的 key 参数(避免客户端传入的认证信息泄露到上游) # 上游认证始终使用 header 方式,不使用 URL 参数 if endpoint_sig.startswith("gemini:"): effective_query_params.pop("key", None) # Provider transport hook: 如果有注册的 hook 则委托处理 from src.services.provider.envelope import ensure_providers_bootstrapped ensure_providers_bootstrapped(provider_types=[provider_type] if provider_type else None) if provider_type and endpoint_sig: hook = _transport_hooks.get((provider_type, endpoint_sig)) # Codex hook 仅在无 custom_path 时生效 if hook and not (provider_type == ProviderType.CODEX and endpoint.custom_path): return hook( endpoint, is_stream=is_stream, effective_query_params=effective_query_params, path_params=path_params, key=key, decrypted_auth_config=decrypted_auth_config, ) # 非 hook 路径:清除 contextvar,避免跨请求污染 set_selected_base_url(None) # 准备路径参数(Gemini chat/cli 需要 action) effective_path_params = dict(path_params) if path_params else {} if endpoint_sig.startswith("gemini:"): try: kind = EndpointKind(endpoint_sig.split(":", 1)[1]) except Exception: kind = None if kind in {EndpointKind.CHAT, EndpointKind.CLI} and "action" not in effective_path_params: effective_path_params["action"] = ( "streamGenerateContent" if is_stream else "generateContent" ) # 优先使用 custom_path 字段 if endpoint.custom_path: path = endpoint.custom_path if effective_path_params: try: path = path.format(**effective_path_params) except KeyError: # 如果模板变量不匹配,保持原路径 pass else: # 使用 API 格式的默认路径 path = _resolve_default_path(endpoint_sig) # Codex OAuth 端点(chatgpt.com/backend-api/codex)使用 /responses 而非 /v1/responses base_url = getattr(endpoint, "base_url", "") or "" if endpoint_sig in {"openai:cli", "openai:compact"} and is_codex_url(base_url): path = "/responses/compact" if endpoint_sig == "openai:compact" else "/responses" if effective_path_params: try: path = path.format(**effective_path_params) except KeyError: # 如果模板变量不匹配,保持原路径 pass if not path.startswith("/"): path = f"/{path}" # 先确定 path,再根据 path 规范化 base_url # base_url 在数据库中是 NOT NULL,类型标注为 Optional 是 SQLAlchemy 限制 base = _normalize_base_url(endpoint.base_url, path) # type: ignore[arg-type] url = f"{base}{path}" # Gemini streamGenerateContent 官方支持 `?alt=sse` 返回 SSE(data: {...})。 # 网关侧统一使用 SSE 输出,优先向上游请求 SSE 以减少解析分支;同时保留 JSON-array 兜底解析。 if endpoint_sig.startswith("gemini:") and is_stream: effective_query_params.setdefault("alt", "sse") # 添加查询参数 if effective_query_params: query_string = urlencode(effective_query_params, doseq=True) if query_string: url = f"{url}?{query_string}" return url def _resolve_default_path(endpoint_sig: str | None) -> str: """根据 endpoint signature 返回默认路径。""" try: return get_default_path_for_endpoint(endpoint_sig or "") except Exception: logger.warning(f"Unknown endpoint signature '{endpoint_sig}' for endpoint, fallback to '/'") return "/"