configpanel: forbid extra props on BaseOption + accordingly fix tests

src/tests/test_questions.py

@@ -16,6 +16,7 @@ from yunohost import app, domain, user
 from yunohost.utils.form import (
     OPTIONS,
     FORBIDDEN_PASSWORD_CHARS,
+    READONLY_TYPES,
     ask_questions_and_parse_answers,
     BaseChoicesOption,
     BaseInputOption,
@@ -444,6 +445,9 @@ class BaseTest:
     def _test_basic_attrs(self):
         raw_option = self.get_raw_option(optional=True)
 
+        if raw_option["type"] in READONLY_TYPES:
+            del raw_option["optional"]
+
         if raw_option["type"] == "select":
             raw_option["choices"] = ["one"]
 

src/utils/form.py

@@ -258,6 +258,12 @@ class OptionType(str, Enum):
     group = "group"
 
 
+READONLY_TYPES = {
+    OptionType.display_text,
+    OptionType.markdown,
+    OptionType.alert,
+    OptionType.button,
+}
 FORBIDDEN_READONLY_TYPES = {
     OptionType.password,
     OptionType.app,
@@ -310,6 +316,7 @@ class BaseOption(BaseModel):
         arbitrary_types_allowed = True
         use_enum_values = True
         validate_assignment = True
+        extra = Extra.forbid
 
         @staticmethod
         def schema_extra(schema: dict[str, Any], model: Type["BaseOption"]) -> None:
@@ -1314,9 +1321,11 @@ class OptionsModel(BaseModel):
                     "type",
                     OptionType.select if "choices" in data else OptionType.string,
                 ),
-                "optional": data.get("optional", optional),
             }
 
+            if option["type"] not in READONLY_TYPES:
+                option["optional"] = option.get("optional", optional)
+
             # LEGACY (`choices` in option `string` used to be valid)
             if "choices" in option and option["type"] == OptionType.string:
                 logger.warning(