start vrf data model; move models to dedicated module

hyperglass/configuration/models/credentials.py

@@ -0,0 +1,44 @@
+"""
+Defines models for Credential config variables.
+
+Imports config variables and overrides default class attributes.
+
+Validates input for overridden parameters.
+"""
+
+# Third Party Imports
+from pydantic import BaseSettings
+from pydantic import SecretStr
+
+# Project Imports
+from hyperglass.configuration.models._utils import clean_name
+
+
+class Credential(BaseSettings):
+    """Model for per-credential config in devices.yaml"""
+
+    username: str
+    password: SecretStr
+
+
+class Credentials(BaseSettings):
+    """Base model for credentials class"""
+
+    @classmethod
+    def import_params(cls, input_params):
+        """
+        Imports passed dict from YAML config, removes unsupported
+        characters from device names, dynamically sets attributes for
+        the credentials class.
+        """
+        obj = Credentials()
+        for (credname, params) in input_params.items():
+            cred = clean_name(credname)
+            setattr(Credentials, cred, Credential(**params))
+        return obj
+
+    class Config:
+        """Pydantic Config"""
+
+        validate_all = True
+        validate_assignment = True