Remove explicit initializers and meta fields from configspec classes

dlt/sources/helpers/rest_client/auth.py

@@ -43,12 +43,7 @@ class AuthConfigBase(AuthBase, CredentialsConfiguration):
 
 @configspec
 class BearerTokenAuth(AuthConfigBase):
-    type: Final[Literal["http"]] = "http"  # noqa: A003
-    scheme: Literal["bearer"] = "bearer"
-    token: TSecretStrValue
-
-    def __init__(self, token: TSecretStrValue = secrets.value) -> None:
-        self.token = token
+    token: TSecretStrValue = None
 
     def parse_native_representation(self, value: Any) -> None:
         if isinstance(value, str):
@@ -67,21 +62,10 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
 
 @configspec
 class APIKeyAuth(AuthConfigBase):
-    type: Final[Literal["apiKey"]] = "apiKey"  # noqa: A003
     name: str = "Authorization"
-    api_key: TSecretStrValue
+    api_key: TSecretStrValue = None
     location: TApiKeyLocation = "header"
 
-    def __init__(
-        self,
-        name: str = config.value,
-        api_key: TSecretStrValue = secrets.value,
-        location: TApiKeyLocation = "header",
-    ) -> None:
-        self.name = name
-        self.api_key = api_key
-        self.location = location
-
     def parse_native_representation(self, value: Any) -> None:
         if isinstance(value, str):
             self.api_key = cast(TSecretStrValue, value)
@@ -104,16 +88,8 @@ def __call__(self, request: PreparedRequest) -> PreparedRequest:
 
 @configspec
 class HttpBasicAuth(AuthConfigBase):
-    type: Final[Literal["http"]] = "http"  # noqa: A003
-    scheme: Literal["basic"] = "basic"
-    username: str
-    password: TSecretStrValue
-
-    def __init__(
-        self, username: str = config.value, password: TSecretStrValue = secrets.value
-    ) -> None:
-        self.username = username
-        self.password = password
+    username: str = ""
+    password: TSecretStrValue = None
 
     def parse_native_representation(self, value: Any) -> None:
         if isinstance(value, Iterable) and not isinstance(value, str):
@@ -138,11 +114,7 @@ class OAuth2AuthBase(AuthConfigBase):
     """Base class for oauth2 authenticators. requires access_token"""
 
     # TODO: Separate class for flows (implicit, authorization_code, client_credentials, etc)
-    type: Final[Literal["oauth2"]] = "oauth2"  # noqa: A003
-    access_token: TSecretStrValue
-
-    def __init__(self, access_token: TSecretStrValue = secrets.value) -> None:
-        self.access_token = access_token
+    access_token: TSecretStrValue = None
 
     def parse_native_representation(self, value: Any) -> None:
         if isinstance(value, str):
@@ -164,33 +136,20 @@ class OAuthJWTAuth(BearerTokenAuth):
     """This is a form of Bearer auth, actually there's not standard way to declare it in openAPI"""
 
     format: Final[Literal["JWT"]] = "JWT"  # noqa: A003
-    client_id: str
-    private_key: TSecretStrValue
-    auth_endpoint: str
-    scopes: Optional[str] = None
+    client_id: str = None
+    private_key: TSecretStrValue = None
+    auth_endpoint: str = None
+    scopes: Optional[Union[str, List[str]]] = None
     headers: Optional[Dict[str, str]] = None
     private_key_passphrase: Optional[TSecretStrValue] = None
     default_token_expiration: int = 3600
 
-    def __init__(
-        self,
-        client_id: str = config.value,
-        private_key: TSecretStrValue = secrets.value,
-        auth_endpoint: str = config.value,
-        scopes: Optional[Union[str, List[str]]] = None,
-        headers: Optional[Dict[str, str]] = None,
-        private_key_passphrase: Optional[TSecretStrValue] = None,
-        default_token_expiration: int = 3600,
-    ):
-        self.client_id = client_id
-        self.private_key = private_key
-        self.private_key_passphrase = private_key_passphrase
-        self.auth_endpoint = auth_endpoint
-        self.scopes = scopes if isinstance(scopes, str) else " ".join(scopes)
-        self.headers = headers
+    def __post_init__(self) -> None:
+        self.scopes = (
+            self.scopes if isinstance(self.scopes, str) else " ".join(self.scopes)
+        )
         self.token = None
         self.token_expiry: Optional[pendulum.DateTime] = None
-        self.default_token_expiration = default_token_expiration
 
     def __call__(self, r: PreparedRequest) -> PreparedRequest:
         if self.token is None or self.is_token_expired():
@@ -229,7 +188,7 @@ def create_jwt_payload(self) -> Dict[str, Union[str, int]]:
             "aud": self.auth_endpoint,
             "exp": math.floor((now.add(hours=1)).timestamp()),
             "iat": math.floor(now.timestamp()),
-            "scope": self.scopes,
+            "scope": cast(str, self.scopes),
         }
 
     def load_private_key(self) -> PrivateKeyTypes: