Add message-envelope type

schemas/data-ingress/message-envelope.json

@@ -0,0 +1,32 @@
+{
+    "$id": "https://schema.owlboard.info/data-ingress/message-envelope.schema.json",
+    "$schema": "https://json-schema.org/draft-07/schema#",
+    "title": "MessageEnvelope",
+    "type": "object",
+    "properties": {
+        "service_name": {
+            "type": "string",
+            "description": "Name of the service submitting the update"
+        },
+        "service_id": {
+            "type": "string",
+            "description": "ID of the service sending the message - usually a hostname"
+        },
+        "data_type": {
+            "type": "string",
+            "enum": ["file"],
+            "description": "The type of data contained in this message object"
+        },
+        "sent_timestamp": {
+            "type": "integer",
+            "description": "Unix timestamp representing the time the message was sent"
+        },
+        "data_kind": {
+            "type": "string",
+            "enum": ["pis", "timetable", "knowledgebase"],
+            "description": "The data type contained in the message.  Currently supported PIS: PIS Data, Timetable: CIF or VSTP Data, Knowledgebase: Station Data"
+        }
+    },
+    "required": ["service_name", "service_id", "data_type", "sent_timestamp"],
+    "additionalProperties": true
+}