配置

app/config.py

@@ -1,9 +1,10 @@
 from __future__ import annotations
 
+import os
 from functools import lru_cache
 from pathlib import Path
 
-from pydantic import Field
+from pydantic import AliasChoices, Field, field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
@@ -25,7 +26,10 @@ class Settings(BaseSettings):
     cache_ttl_seconds: int = 900
     bundle_cache_ttl_seconds: int = 600
     max_proxy_name_length: int = 80
-    default_user_agent: str = "sub-provider/0.2"
+    default_user_agent: str = Field(
+        default="sub-provider/0.2",
+        validation_alias=AliasChoices("UPSTREAM_USER_AGENT", "DEFAULT_USER_AGENT"),
+    )
 
     sources_file: Path = CONFIG_DIR / "sources.yaml"
     conf_base_file: Path = CONFIG_DIR / "conf" / "base.conf"
@@ -40,6 +44,16 @@ class Settings(BaseSettings):
         extra="ignore",
     )
 
+    @field_validator("default_user_agent", mode="before")
+    @classmethod
+    def _coalesce_default_user_agent(cls, value: str) -> str:
+        if isinstance(value, str) and value.strip():
+            return value
+        legacy = os.getenv("DEFAULT_USER_AGENT", "").strip()
+        if legacy:
+            return legacy
+        return "sub-provider/0.2"
+
 
 @lru_cache(maxsize=1)
 def get_settings() -> Settings: