add GET /api/v1/admin/backend_settings/{full/public} endpoint for api-clients (#830)

* add GET /api/v1/admin/backend_settings endpoint for trusted api-clients

* add backend_settings/public for untrusted api_clients

backend/oasst_backend/api/v1/admin.py

@@ -4,6 +4,7 @@ import pydantic
 from fastapi import APIRouter, Depends
 from loguru import logger
 from oasst_backend.api import deps
+from oasst_backend.config import Settings, settings
 from oasst_backend.models.api_client import ApiClient
 from oasst_backend.prompt_repository import PromptRepository
 from oasst_backend.tree_manager import TreeManager
@@ -21,7 +22,7 @@ class CreateApiClientRequest(pydantic.BaseModel):
     admin_email: str | None = None
 
 
-@router.post("/api_client")
+@router.post("/api_client", response_model=str)
 async def create_api_client(
     request: CreateApiClientRequest,
     root_token: str = Depends(deps.get_root_token),
@@ -39,6 +40,35 @@ async def create_api_client(
     return api_client.api_key
 
 
+@router.get("/backend_settings/full", response_model=Settings)
+async def get_backend_settings_full(api_client: ApiClient = Depends(deps.get_trusted_api_client)) -> Settings:
+    logger.info(
+        f"Backend settings requested by trusted api_client {api_client.id} (admin_email: {api_client.admin_email}, frontend_type: {api_client.frontend_type})"
+    )
+    return settings
+
+
+class PublicSettings(pydantic.BaseModel):
+    """Subset of backend settings which can be retrieved by untrusted API clients."""
+
+    PROJECT_NAME: str
+    API_V1_STR: str
+    DEBUG_USE_SEED_DATA: bool
+    DEBUG_ALLOW_SELF_LABELING: bool
+    DEBUG_SKIP_EMBEDDING_COMPUTATION: bool
+    DEBUG_SKIP_TOXICITY_CALCULATION: bool
+    DEBUG_DATABASE_ECHO: bool
+    USER_STATS_INTERVAL_DAY: int
+    USER_STATS_INTERVAL_WEEK: int
+    USER_STATS_INTERVAL_MONTH: int
+    USER_STATS_INTERVAL_TOTAL: int
+
+
+@router.get("/backend_settings/public", response_model=PublicSettings)
+async def get_backend_settings_public(api_client: ApiClient = Depends(deps.get_api_client)) -> PublicSettings:
+    return PublicSettings(**settings.dict())
+
+
 class PurgeResultModel(pydantic.BaseModel):
     before: SystemStats
     after: SystemStats