refactor: modularize API routes into separate files and clean up dependencies

decnet/web/dependencies.py

@@ -0,0 +1,46 @@
+from typing import Any, Optional
+from pathlib import Path
+
+import jwt
+from fastapi import HTTPException, status, Request
+from fastapi.security import OAuth2PasswordBearer
+
+from decnet.web.auth import ALGORITHM, SECRET_KEY
+from decnet.web.sqlite_repository import SQLiteRepository
+
+# Root directory for database
+_ROOT_DIR = Path(__file__).parent.parent.parent.absolute()
+DB_PATH = _ROOT_DIR / "decnet.db"
+
+# Shared repository instance
+repo = SQLiteRepository(db_path=str(DB_PATH))
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")
+
+
+async def get_current_user(request: Request) -> str:
+    _credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    # Extract token from header or query param
+    token: str | None = None
+    auth_header = request.headers.get("Authorization")
+    if auth_header and auth_header.startswith("Bearer "):
+        token = auth_header.split(" ")[1]
+    elif request.query_params.get("token"):
+        token = request.query_params.get("token")
+        
+    if not token:
+        raise _credentials_exception
+
+    try:
+        _payload: dict[str, Any] = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        _user_uuid: Optional[str] = _payload.get("uuid")
+        if _user_uuid is None:
+            raise _credentials_exception
+        return _user_uuid
+    except jwt.PyJWTError:
+        raise _credentials_exception