Try layers validation with json-schema

Author: chbrandt

validator/vector/geopackage_layers.schema.json

@@ -0,0 +1,23 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+
+    "definitions": {
+        "columns": {
+            "type": "string",
+            "enum": ["units", "contacts"]
+        }
+    },
+
+    "type": "array",
+    "items": [
+        {
+            "$ref": "#/definitions/columns"
+        },
+        {
+            "$ref": "#/definitions/columns"
+        }
+    ],
+    "minItems": 2,
+    "uniqueItems": true,
+    "additionalItems": { "type": "string" }
+}

validator/vector/geopackage_layers.validator.py

@@ -0,0 +1,13 @@
+import jsonschema
+import json
+
+_component = __file__.split('.')[0]
+_schemafile = '.'.join([_component, 'schmea', 'json'])
+
+def validate(geopackage):
+    import fiona
+    with open(_schemafile) as f:
+        schema = json.load(_schemafile)
+
+    data = fiona.listlayers(geopackage)
+    res = jsonschema.validate(data, schema)