add Greeting modal component

hyperglass/configuration/__init__.py

@@ -391,6 +391,12 @@ def _build_vrf_help():
     return all_help
 
 
+content_greeting = get_markdown(
+    config_path=params.web.greeting,
+    default="",
+    params={"title": params.web.greeting.title},
+)
+
 content_vrf = _build_vrf_help()
 
 content_help_params = copy.copy(content_params)
@@ -436,6 +442,7 @@ _frontend_params.update(
             "terms": content_terms,
             "credit": content_credit,
             "vrf": content_vrf,
+            "greeting": content_greeting,
         },
     }
 )

hyperglass/configuration/models/web.py

@@ -69,6 +69,23 @@ class HelpMenu(HyperglassModel):
     title: StrictStr = "Help"
 
 
+class Greeting(HyperglassModel):
+    """Validation model for greeting modal."""
+
+    enable: StrictBool = False
+    file: Optional[FilePath]
+    title: StrictStr = "Welcome"
+    button: StrictStr = "Continue"
+    required: StrictBool = False
+
+    @validator("file")
+    def validate_file(cls, value, values):
+        """Ensure file is specified if greeting is enabled."""
+        if values["enable"] and value is None:
+            raise ValueError("Greeting is enabled, but no file is specified.")
+        return value
+
+
 class Logo(HyperglassModel):
     """Validation model for logo configuration."""
 
@@ -214,6 +231,7 @@ class Web(HyperglassModel):
     credit: Credit = Credit()
     dns_provider: DnsOverHttps = DnsOverHttps()
     external_link: ExternalLink = ExternalLink()
+    greeting: Greeting = Greeting()
     help_menu: HelpMenu = HelpMenu()
     logo: Logo = Logo()
     opengraph: OpenGraph = OpenGraph()