[#3688] Fix some edge cases when parsing JSON Schemas

src/openforms/registrations/contrib/objects_api/json_schema.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import itertools
 from dataclasses import dataclass, field, replace
 from typing import Iterator, Literal, overload
 
@@ -76,31 +77,37 @@ def iter_json_schema_paths(
     def _iter_json_schema(
         json_schema: ObjectSchema, parent_json_path: JsonSchemaPath
     ) -> Iterator[tuple[JsonSchemaPath, ObjectSchema | InvalidReference]]:
-        assert json_schema.get("type") == "object"
 
         yield parent_json_path, json_schema
 
-        required = json_schema.get("required", [])
-
-        k: str
-        for k, v in json_schema["properties"].items():
-            json_path = parent_json_path / k
-            json_path.required = k in required
-
-            match v:
-                case {"type": "object"}:
-                    yield from _iter_json_schema(v, json_path)
-                case {"$ref": str(uri)}:
-                    try:
-                        resolved = resolver.lookup(uri)
-                    except Unresolvable as exc:
-                        if fail_fast:
-                            raise
-                        yield json_path, InvalidReference(uri, exc)
-                    else:
-                        yield from _iter_json_schema(resolved.contents, json_path)
-                case {}:
-                    yield json_path, v
+        if "properties" in json_schema:
+            required = json_schema.get("required", [])
+
+            k: str
+            for k, v in json_schema["properties"].items():
+                json_path = parent_json_path / k
+                json_path.required = k in required
+
+                match v:
+                    case {"properties": dict()}:
+                        # `type` is not required. But if provided, we want to make sure
+                        # it is 'object' (or a list of allowed types where 'object' is allowed).
+                        type_ = v.get("type", "object")
+                        assert isinstance(type_, (str, list))
+                        assert type_ == "object" or "object" in type_
+
+                        yield from _iter_json_schema(v, json_path)
+                    case {"$ref": str(uri)}:
+                        try:
+                            resolved = resolver.lookup(uri)
+                        except Unresolvable as exc:
+                            if fail_fast:
+                                raise
+                            yield json_path, InvalidReference(uri, exc)
+                        else:
+                            yield from _iter_json_schema(resolved.contents, json_path)
+                    case {}:
+                        yield json_path, v
 
     yield from _iter_json_schema(json_schema, parent_json_path)
 
@@ -131,9 +138,11 @@ def get_missing_required_paths(
     """
     missing_paths: list[list[str]] = []
 
-    for r_path, _ in iter_json_schema_paths(json_schema):
-        if not r_path.required:
-            continue
+    required_paths = [
+        r_path for r_path, _ in iter_json_schema_paths(json_schema) if r_path.required
+    ]
+
+    for r_path in required_paths:
 
         # If a child key is provided (e.g. "a.b"), any required parent key is dismissed (e.g. "a").
         if any(JsonSchemaPath(path).startswith(r_path) for path in paths):
@@ -146,6 +155,16 @@ def get_missing_required_paths(
         if any(r_path.startswith(path) for path in paths):
             continue
 
+        # If the required path is "a.b.c", the two previous checks tell us "a.b.c.x" and "a"/"a.b" wasn't provided.
+        # However, we need to check if *all* the sub segments (i.e. "a.b" and "a") are required, as we can't
+        # flag "a.b.c" as missing if for instance "a" is not required *and* not provided.
+        if not all(
+            JsonSchemaPath(subsegments, required=True) in required_paths
+            # fancy way of iterating over [["a"], ["a", "b"]]:
+            for subsegments in itertools.accumulate(map(lambda s: [s], r_path.segments))
+        ):
+            continue
+
         missing_paths.append(r_path.segments)
 
     return missing_paths

src/openforms/registrations/contrib/objects_api/tests/test_json_schema.py

@@ -17,11 +17,24 @@
             "properties": {
                 "first.name": {"type": "string"},
                 "last.name": {"type": "string"},
+                "two_types": {
+                    "type": ["string", "number"],
+                },
             },
         },
     },
 }
 
+JSON_SCHEMA_NO_TYPE = {
+    "$id": "noise-complaint.schema",
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "additionalProperties": False,
+    "properties": {
+        "complaintDescription": {"type": "string"},
+    },
+}
+
+
 JSON_SCHEMA_REFS = {
     "$id": "noise-complaint.schema",
     "$schema": "http://json-schema.org/draft-07/schema#",
@@ -30,6 +43,7 @@
     "properties": {
         "complainant": {"$ref": "#/definitions/person"},
         "noisyAddress": {"$ref": "#/definitions/address"},
+        "phoneNumber": {"$ref": "#/definitions/phoneNumber"},
     },
     "definitions": {
         "person": {
@@ -45,6 +59,9 @@
                 "street": {"type": "string"},
             },
         },
+        "phoneNumber": {
+            "type": "number",
+        },
     },
 }
 
@@ -118,6 +135,22 @@
     "required": ["a", "b"],
 }
 
+# "a" not required, but "a.b" is:
+JSON_SCHEMA_DEEP_REQUIRED = {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "type": "object",
+    "properties": {
+        "a": {
+            "type": "object",
+            "required": ["b"],
+            "properties": {
+                "b": {"type": "string"},
+                "c": {"type": "string"},
+            },
+        }
+    },
+}
+
 
 class IterJsonSchemaTests(SimpleTestCase):
     """Test cases to assert the JSON Schemas are correctly iterated over.
@@ -143,12 +176,27 @@ def test_iter_json_schema_no_refs(self):
                         "properties": {
                             "first.name": {"type": "string"},
                             "last.name": {"type": "string"},
+                            "two_types": {"type": ["string", "number"]},
                         },
                         "type": "object",
                     },
                 ),
                 (["complainant", "first.name"], {"type": "string"}),
                 (["complainant", "last.name"], {"type": "string"}),
+                (["complainant", "two_types"], {"type": ["string", "number"]}),
+            ],
+        )
+
+    def test_iter_json_schema_no_type(self):
+        paths_list = [
+            (path.segments, schema)
+            for path, schema in iter_json_schema_paths(JSON_SCHEMA_NO_TYPE)
+        ]
+
+        self.assertEqual(
+            paths_list[1:],
+            [
+                (["complaintDescription"], {"type": "string"}),
             ],
         )
 
@@ -183,6 +231,7 @@ def test_iter_json_schema_refs(self):
                     },
                 ),
                 (["noisyAddress", "street"], {"type": "string"}),
+                (["phoneNumber"], {"type": "number"}),
             ],
         )
 
@@ -309,3 +358,9 @@ def test_missing_required_paths(self):
             )
 
             self.assertEqual(missing_paths, [["b", "d", "e"]])
+
+    def test_required_path_deep(self):
+        """Test that "a.b" is not marked as required if "a" is not provided."""
+
+        missing_paths = get_missing_required_paths(JSON_SCHEMA_DEEP_REQUIRED, [])
+        self.assertEqual(missing_paths, [])