migrate config models to models module

hyperglass/models/config/opengraph.py

@@ -0,0 +1,40 @@
+"""Validate OpenGraph Configuration Parameters."""
+
+# Standard Library
+import os
+from pathlib import Path
+
+# Third Party
+from pydantic import FilePath, validator
+
+# Local
+from ..main import HyperglassModel
+
+CONFIG_PATH = Path(os.environ["hyperglass_directory"])
+DEFAULT_IMAGES = Path(__file__).parent.parent.parent / "images"
+
+
+class OpenGraph(HyperglassModel):
+    """Validation model for params.opengraph."""
+
+    image: FilePath = DEFAULT_IMAGES / "hyperglass-opengraph.jpg"
+
+    @validator("image")
+    def validate_opengraph(cls, value):
+        """Ensure the opengraph image is a supported format.
+
+        Arguments:
+            value {FilePath} -- Path to opengraph image file.
+
+        Returns:
+            {Path} -- Opengraph image file path object
+        """
+        supported_extensions = (".jpg", ".jpeg", ".png")
+        if value is not None and value.suffix not in supported_extensions:
+            raise ValueError(
+                "OpenGraph image must be one of {e}".format(
+                    e=", ".join(supported_extensions)
+                )
+            )
+
+        return value