Merge branch 'enh-config-panel-file' of github.com:YunoHost/yunohost into enh-config-panel-file

src/yunohost/app.py

@@ -56,7 +56,7 @@ from yunohost.utils import packages
 from yunohost.utils.config import (
     ConfigPanel,
     parse_args_in_yunohost_format,
-    YunoHostArgumentFormatParser,
+    Question,
 )
 from yunohost.utils.i18n import _value_for_locale
 from yunohost.utils.error import YunohostError, YunohostValidationError
@@ -1769,7 +1769,7 @@ def app_config_set(
 
     config_ = AppConfigPanel(app)
 
-    YunoHostArgumentFormatParser.operation_logger = operation_logger
+    Question.operation_logger = operation_logger
     operation_logger.start()
 
     result = config_.set(key, value, args, args_file)
@@ -1792,7 +1792,8 @@ class AppConfigPanel(ConfigPanel):
         self.values = self._call_config_script("show")
 
     def _apply(self):
-        self.errors = self._call_config_script("apply", self.new_values)
+        env = {key: str(value) for key, value in self.new_values.items()}
+        self.errors = self._call_config_script("apply", env=env)
 
     def _call_config_script(self, action, env={}):
         from yunohost.hook import hook_exec

src/yunohost/utils/config.py

@@ -80,12 +80,16 @@ class ConfigPanel:
         result = {}
         for panel, section, option in self._iterate():
             key = f"{panel['id']}.{section['id']}.{option['id']}"
-            if mode == "export":
-                result[option["id"]] = option.get("current_value")
+            if mode == 'export':
+                result[option['id']] = option.get('current_value')
             else:
-                result[key] = {"ask": _value_for_locale(option["ask"])}
-                if "current_value" in option:
-                    result[key]["value"] = option["current_value"]
+                if 'ask' in option:
+                    result[key] = {'ask': _value_for_locale(option['ask'])}
+                elif 'i18n' in self.config:
+                    result[key] = {'ask': m18n.n(self.config['i18n'] + '_' + option['id'])}
+                if 'current_value' in option:
+                    question_class = ARGUMENTS_TYPE_PARSERS[option.get("type", "string")]
+                    result[key]['value'] = question_class.humanize(option['current_value'], option)
 
         return result
 
@@ -139,7 +143,7 @@ class ConfigPanel:
             raise
         finally:
             # Delete files uploaded from API
-            FileArgumentParser.clean_upload_dirs()
+            FileQuestion.clean_upload_dirs()
 
         if self.errors:
             return {
@@ -283,16 +287,42 @@ class ConfigPanel:
                 parse_args_in_yunohost_format(self.args, section["options"])
             )
         self.new_values = {
-            key: str(value[0])
+            key: value[0]
             for key, value in self.new_values.items()
             if not value[0] is None
         }
+        self.errors = None
+
+    def _get_default_values(self):
+        return { option['id']: option['default']
+                for _, _, option in self._iterate() if 'default' in option }
+
+    def _load_current_values(self):
+        """
+        Retrieve entries in YAML file
+        And set default values if needed
+        """
+
+        # Retrieve entries in the YAML
+        on_disk_settings = {}
+        if os.path.exists(self.save_path) and os.path.isfile(self.save_path):
+            on_disk_settings = read_yaml(self.save_path) or {}
+
+        # Inject defaults if needed (using the magic .update() ;))
+        self.values = self._get_default_values()
+        self.values.update(on_disk_settings)
 
     def _apply(self):
-        logger.info("Running config script...")
+        logger.info("Saving the new configuration...")
         dir_path = os.path.dirname(os.path.realpath(self.save_path))
         if not os.path.exists(dir_path):
             mkdir(dir_path, mode=0o700)
+
+        values_to_save = {**self.values, **self.new_values}
+        if self.save_mode == 'diff':
+            defaults = self._get_default_values()
+            values_to_save = {k: v for k, v in values_to_save.items() if defaults.get(k) != v}
+
         # Save the settings to the .yaml file
         write_to_yaml(self.save_path, self.new_values)
 
@@ -300,13 +330,14 @@ class ConfigPanel:
 
         from yunohost.service import service_reload_or_restart
 
-        logger.info("Reloading services...")
         services_to_reload = set()
         for panel, section, obj in self._iterate(["panel", "section", "option"]):
             services_to_reload |= set(obj.get("services", []))
 
         services_to_reload = list(services_to_reload)
         services_to_reload.sort(key="nginx".__eq__)
+        if services_to_reload:
+            logger.info("Reloading services...")
         for service in services_to_reload:
             service = service.replace("__APP__", self.app)
             service_reload_or_restart(service)
@@ -323,140 +354,138 @@ class ConfigPanel:
                         yield (panel, section, option)
 
 
-class Question:
-    "empty class to store questions information"
-
-
-class YunoHostArgumentFormatParser(object):
+class Question(object):
     hide_user_input_in_prompt = False
     operation_logger = None
 
-    def parse_question(self, question, user_answers):
-        parsed_question = Question()
-
-        parsed_question.name = question["name"]
-        parsed_question.type = question.get("type", "string")
-        parsed_question.default = question.get("default", None)
-        parsed_question.current_value = question.get("current_value")
-        parsed_question.optional = question.get("optional", False)
-        parsed_question.choices = question.get("choices", [])
-        parsed_question.pattern = question.get("pattern")
-        parsed_question.ask = question.get("ask", {"en": f"{parsed_question.name}"})
-        parsed_question.help = question.get("help")
-        parsed_question.helpLink = question.get("helpLink")
-        parsed_question.value = user_answers.get(parsed_question.name)
-        parsed_question.redact = question.get("redact", False)
+    def __init__(self, question, user_answers):
+        self.name = question["name"]
+        self.type = question.get("type", 'string')
+        self.default = question.get("default", None)
+        self.current_value = question.get("current_value")
+        self.optional = question.get("optional", False)
+        self.choices = question.get("choices", [])
+        self.pattern = question.get("pattern")
+        self.ask = question.get("ask", {'en': self.name})
+        self.help = question.get("help")
+        self.helpLink = question.get("helpLink")
+        self.value = user_answers.get(self.name)
+        self.redact = question.get('redact', False)
 
         # Empty value is parsed as empty string
-        if parsed_question.default == "":
-            parsed_question.default = None
+        if self.default == "":
+            self.default = None
 
-        return parsed_question
+    @staticmethod
+    def humanize(value, option={}):
+        return str(value)
 
-    def parse(self, question, user_answers):
-        question = self.parse_question(question, user_answers)
+    @staticmethod
+    def normalize(value, option={}):
+        return value
 
+
+    def ask_if_needed(self):
         while True:
             # Display question if no value filled or if it's a readonly message
-            if Moulinette.interface.type == "cli":
-                text_for_user_input_in_cli = self._format_text_for_user_input_in_cli(
-                    question
-                )
+            if Moulinette.interface.type== 'cli':
+                text_for_user_input_in_cli = self._format_text_for_user_input_in_cli()
                 if getattr(self, "readonly", False):
                     Moulinette.display(text_for_user_input_in_cli)
 
-                elif question.value is None:
+                elif self.value is None:
                     prefill = ""
-                    if question.current_value is not None:
-                        prefill = question.current_value
-                    elif question.default is not None:
-                        prefill = question.default
-                    question.value = Moulinette.prompt(
+                    if self.current_value is not None:
+                        prefill = self.humanize(self.current_value, self)
+                    elif self.default is not None:
+                        prefill = self.default
+                    self.value = Moulinette.prompt(
                         message=text_for_user_input_in_cli,
                         is_password=self.hide_user_input_in_prompt,
                         confirm=self.hide_user_input_in_prompt,
                         prefill=prefill,
-                        is_multiline=(question.type == "text"),
+                        is_multiline=(self.type == "text"),
                     )
 
+            # Normalization
+            # This is done to enforce a certain formating like for boolean
+            self.value = self.normalize(self.value, self)
+
             # Apply default value
-            if question.value in [None, ""] and question.default is not None:
-                question.value = (
+            if self.value in [None, ""] and self.default is not None:
+                self.value = (
                     getattr(self, "default_value", None)
-                    if question.default is None
-                    else question.default
+                    if self.default is None
+                    else self.default
                 )
 
             # Prevalidation
             try:
-                self._prevalidate(question)
+                self._prevalidate()
             except YunohostValidationError as e:
                 if Moulinette.interface.type == "api":
                     raise
                 Moulinette.display(str(e), "error")
-                question.value = None
+                self.value = None
                 continue
             break
-        # this is done to enforce a certain formating like for boolean
-        # by default it doesn't do anything
-        question.value = self._post_parse_value(question)
+        self.value = self._post_parse_value()
 
-        return (question.value, self.argument_type)
+        return (self.value, self.argument_type)
 
-    def _prevalidate(self, question):
-        if question.value in [None, ""] and not question.optional:
-            raise YunohostValidationError("app_argument_required", name=question.name)
+
+    def _prevalidate(self):
+        if self.value in [None, ""] and not self.optional:
+            raise YunohostValidationError("app_argument_required", name=self.name)
 
         # we have an answer, do some post checks
-        if question.value is not None:
-            if question.choices and question.value not in question.choices:
-                self._raise_invalid_answer(question)
-            if question.pattern and not re.match(
-                question.pattern["regexp"], str(question.value)
-            ):
+        if self.value is not None:
+            if self.choices and self.value not in self.choices:
+                self._raise_invalid_answer()
+            if self.pattern and not re.match(self.pattern['regexp'], str(self.value)):
                 raise YunohostValidationError(
-                    question.pattern["error"],
-                    name=question.name,
-                    value=question.value,
+                    self.pattern['error'],
+                    name=self.name,
+                    value=self.value,
                 )
 
-    def _raise_invalid_answer(self, question):
+    def _raise_invalid_answer(self):
         raise YunohostValidationError(
             "app_argument_choice_invalid",
-            name=question.name,
-            value=question.value,
-            choices=", ".join(question.choices),
+            name=self.name,
+            value=self.value,
+            choices=", ".join(self.choices),
         )
 
-    def _format_text_for_user_input_in_cli(self, question):
-        text_for_user_input_in_cli = _value_for_locale(question.ask)
+    def _format_text_for_user_input_in_cli(self):
+        text_for_user_input_in_cli = _value_for_locale(self.ask)
 
-        if question.choices:
-            text_for_user_input_in_cli += " [{0}]".format(" | ".join(question.choices))
+        if self.choices:
+            text_for_user_input_in_cli += " [{0}]".format(" | ".join(self.choices))
 
-        if question.help or question.helpLink:
+        if self.help or self.helpLink:
             text_for_user_input_in_cli += ":\033[m"
-        if question.help:
+        if self.help:
             text_for_user_input_in_cli += "\n - "
-            text_for_user_input_in_cli += _value_for_locale(question.help)
-        if question.helpLink:
-            if not isinstance(question.helpLink, dict):
-                question.helpLink = {"href": question.helpLink}
-            text_for_user_input_in_cli += f"\n - See {question.helpLink['href']}"
+            text_for_user_input_in_cli += _value_for_locale(self.help)
+        if self.helpLink:
+            if not isinstance(self.helpLink, dict):
+                self.helpLink = {"href": self.helpLink}
+            text_for_user_input_in_cli += f"\n - See {self.helpLink['href']}"
         return text_for_user_input_in_cli
 
-    def _post_parse_value(self, question):
-        if not question.redact:
-            return question.value
+    def _post_parse_value(self):
+        if not self.redact:
+            return self.value
 
         # Tell the operation_logger to redact all password-type / secret args
         # Also redact the % escaped version of the password that might appear in
         # the 'args' section of metadata (relevant for password with non-alphanumeric char)
         data_to_redact = []
-        if question.value and isinstance(question.value, str):
-            data_to_redact.append(question.value)
-        if question.current_value and isinstance(question.current_value, str):
-            data_to_redact.append(question.current_value)
+        if self.value and isinstance(self.value, str):
+            data_to_redact.append(self.value)
+        if self.current_value and isinstance(self.current_value, str):
+            data_to_redact.append(self.current_value)
         data_to_redact += [
             urllib.parse.quote(data)
             for data in data_to_redact
@@ -467,48 +496,58 @@ class YunoHostArgumentFormatParser(object):
         elif data_to_redact:
             raise YunohostError(f"Can't redact {question.name} because no operation logger available in the context", raw_msg=True)
 
-        return question.value
+        return self.value
 
 
-class StringArgumentParser(YunoHostArgumentFormatParser):
+class StringQuestion(Question):
     argument_type = "string"
     default_value = ""
 
 
-class TagsArgumentParser(YunoHostArgumentFormatParser):
+class TagsQuestion(Question):
     argument_type = "tags"
 
-    def _prevalidate(self, question):
-        values = question.value
-        for value in values.split(","):
-            question.value = value
-            super()._prevalidate(question)
-        question.value = values
+    @staticmethod
+    def humanize(value, option={}):
+        if isinstance(value, list):
+            return ','.join(value)
+        return value
+
+    def _prevalidate(self):
+        values = self.value
+        if isinstance(values, str):
+            values = values.split(",")
+        for value in values:
+            self.value = value
+            super()._prevalidate()
+        self.value = values
 
 
-class PasswordArgumentParser(YunoHostArgumentFormatParser):
+class PasswordQuestion(Question):
     hide_user_input_in_prompt = True
     argument_type = "password"
     default_value = ""
     forbidden_chars = "{}"
 
-    def parse_question(self, question, user_answers):
-        question = super(PasswordArgumentParser, self).parse_question(
-            question, user_answers
-        )
-        question.redact = True
-        if question.default is not None:
+    def __init__(self, question, user_answers):
+        super().__init__(question, user_answers)
+        self.redact = True
+        if self.default is not None:
             raise YunohostValidationError(
-                "app_argument_password_no_default", name=question.name
+                "app_argument_password_no_default", name=self.name
             )
 
-        return question
+    @staticmethod
+    def humanize(value, option={}):
+        if value:
+            return '***' # Avoid to display the password on screen
+        return ""
 
-    def _prevalidate(self, question):
-        super()._prevalidate(question)
+    def _prevalidate(self):
+        super()._prevalidate()
 
-        if question.value is not None:
-            if any(char in question.value for char in self.forbidden_chars):
+        if self.value is not None:
+            if any(char in self.value for char in self.forbidden_chars):
                 raise YunohostValidationError(
                     "pattern_password_app", forbidden_chars=self.forbidden_chars
                 )
@@ -516,184 +555,214 @@ class PasswordArgumentParser(YunoHostArgumentFormatParser):
             # If it's an optional argument the value should be empty or strong enough
             from yunohost.utils.password import assert_password_is_strong_enough
 
-            assert_password_is_strong_enough("user", question.value)
+            assert_password_is_strong_enough("user", self.value)
 
 
-class PathArgumentParser(YunoHostArgumentFormatParser):
+class PathQuestion(Question):
     argument_type = "path"
     default_value = ""
 
 
-class BooleanArgumentParser(YunoHostArgumentFormatParser):
+class BooleanQuestion(Question):
     argument_type = "boolean"
     default_value = False
+    yes_answers = ["1", "yes", "y", "true", "t", "on"]
+    no_answers = ["0", "no", "n", "false", "f", "off"]
 
-    def parse_question(self, question, user_answers):
-        question = super().parse_question(question, user_answers)
+    @staticmethod
+    def humanize(value, option={}):
+        yes = option.get('yes', 1)
+        no = option.get('no', 0)
+        value = str(value).lower()
+        if value == str(yes).lower():
+            return 'yes'
+        if value == str(no).lower():
+            return 'no'
+        if value in BooleanQuestion.yes_answers:
+            return 'yes'
+        if value in BooleanQuestion.no_answers:
+            return 'no'
 
-        if question.default is None:
-            question.default = False
+        if value in ['none', ""]:
+            return ''
 
-        return question
+        raise YunohostValidationError(
+            "app_argument_choice_invalid",
+            name=self.name,
+            value=self.value,
+            choices="yes, no, y, n, 1, 0",
+        )
 
-    def _format_text_for_user_input_in_cli(self, question):
-        text_for_user_input_in_cli = _value_for_locale(question.ask)
+    @staticmethod
+    def normalize(value, option={}):
+        yes = option.get('yes', 1)
+        no = option.get('no', 0)
+
+        if str(value).lower() in BooleanQuestion.yes_answers:
+            return yes
+
+        if str(value).lower() in BooleanQuestion.no_answers:
+            return no
+
+        if value in [None, ""]:
+            return None
+        raise YunohostValidationError(
+            "app_argument_choice_invalid",
+            name=self.name,
+            value=self.value,
+            choices="yes, no, y, n, 1, 0",
+        )
+
+    def __init__(self, question, user_answers):
+        super().__init__(question, user_answers)
+        self.yes = question.get('yes', 1)
+        self.no = question.get('no', 0)
+        if self.default is None:
+            self.default = False
+
+
+    def _format_text_for_user_input_in_cli(self):
+        text_for_user_input_in_cli = _value_for_locale(self.ask)
 
         text_for_user_input_in_cli += " [yes | no]"
 
-        if question.default is not None:
-            formatted_default = "yes" if question.default else "no"
+        if self.default is not None:
+            formatted_default = self.humanize(self.default)
             text_for_user_input_in_cli += " (default: {0})".format(formatted_default)
 
         return text_for_user_input_in_cli
 
-    def _post_parse_value(self, question):
-        if isinstance(question.value, bool):
-            return 1 if question.value else 0
-
-        if str(question.value).lower() in ["1", "yes", "y", "true"]:
-            return 1
-
-        if str(question.value).lower() in ["0", "no", "n", "false"]:
-            return 0
-
-        raise YunohostValidationError(
-            "app_argument_choice_invalid",
-            name=question.name,
-            value=question.value,
-            choices="yes, no, y, n, 1, 0",
-        )
+    def get(self, key, default=None):
+        try:
+            return getattr(self, key)
+        except AttributeError:
+            return default
 
 
-class DomainArgumentParser(YunoHostArgumentFormatParser):
+class DomainQuestion(Question):
     argument_type = "domain"
 
-    def parse_question(self, question, user_answers):
+    def __init__(self, question, user_answers):
         from yunohost.domain import domain_list, _get_maindomain
 
-        question = super(DomainArgumentParser, self).parse_question(
-            question, user_answers
-        )
+        super().__init__(question, user_answers)
 
-        if question.default is None:
-            question.default = _get_maindomain()
+        if self.default is None:
+            self.default = _get_maindomain()
 
-        question.choices = domain_list()["domains"]
+        self.choices = domain_list()["domains"]
 
-        return question
 
-    def _raise_invalid_answer(self, question):
+    def _raise_invalid_answer(self):
         raise YunohostValidationError(
-            "app_argument_invalid", field=question.name, error=m18n.n("domain_unknown")
+            "app_argument_invalid", field=self.name, error=m18n.n("domain_unknown")
         )
 
 
-class UserArgumentParser(YunoHostArgumentFormatParser):
+class UserQuestion(Question):
     argument_type = "user"
 
-    def parse_question(self, question, user_answers):
+    def __init__(self, question, user_answers):
         from yunohost.user import user_list, user_info
         from yunohost.domain import _get_maindomain
 
-        question = super(UserArgumentParser, self).parse_question(
-            question, user_answers
-        )
-        question.choices = user_list()["users"]
-        if question.default is None:
+        super().__init__(question, user_answers)
+        self.choices = user_list()["users"]
+        if self.default is None:
             root_mail = "root@%s" % _get_maindomain()
-            for user in question.choices.keys():
+            for user in self.choices.keys():
                 if root_mail in user_info(user).get("mail-aliases", []):
-                    question.default = user
+                    self.default = user
                     break
 
-        return question
 
-    def _raise_invalid_answer(self, question):
+    def _raise_invalid_answer(self):
         raise YunohostValidationError(
             "app_argument_invalid",
-            field=question.name,
-            error=m18n.n("user_unknown", user=question.value),
+            field=self.name,
+            error=m18n.n("user_unknown", user=self.value),
         )
 
 
-class NumberArgumentParser(YunoHostArgumentFormatParser):
+class NumberQuestion(Question):
     argument_type = "number"
     default_value = ""
 
-    def parse_question(self, question, user_answers):
-        question_parsed = super().parse_question(question, user_answers)
-        question_parsed.min = question.get("min", None)
-        question_parsed.max = question.get("max", None)
-        if question_parsed.default is None:
-            question_parsed.default = 0
+    @staticmethod
+    def humanize(value, option={}):
+        return str(value)
 
-        return question_parsed
+    def __init__(self, question, user_answers):
+        super().__init__(question, user_answers)
+        self.min = question.get("min", None)
+        self.max = question.get("max", None)
+        self.step = question.get("step", None)
 
-    def _prevalidate(self, question):
-        super()._prevalidate(question)
-        if not isinstance(question.value, int) and not (
-            isinstance(question.value, str) and question.value.isdigit()
+
+    def _prevalidate(self):
+        super()._prevalidate()
+        if not isinstance(self.value, int) and not (
+            isinstance(self.value, str) and self.value.isdigit()
         ):
             raise YunohostValidationError(
                 "app_argument_invalid",
-                field=question.name,
+                field=self.name,
                 error=m18n.n("invalid_number"),
             )
 
-        if question.min is not None and int(question.value) < question.min:
+        if self.min is not None and int(self.value) < self.min:
             raise YunohostValidationError(
                 "app_argument_invalid",
-                field=question.name,
+                field=self.name,
                 error=m18n.n("invalid_number"),
             )
 
-        if question.max is not None and int(question.value) > question.max:
+        if self.max is not None and int(self.value) > self.max:
             raise YunohostValidationError(
                 "app_argument_invalid",
-                field=question.name,
+                field=self.name,
                 error=m18n.n("invalid_number"),
             )
 
-    def _post_parse_value(self, question):
-        if isinstance(question.value, int):
-            return super()._post_parse_value(question)
+    def _post_parse_value(self):
+        if isinstance(self.value, int):
+            return super()._post_parse_value()
 
-        if isinstance(question.value, str) and question.value.isdigit():
-            return int(question.value)
+        if isinstance(self.value, str) and self.value.isdigit():
+            return int(self.value)
 
         raise YunohostValidationError(
-            "app_argument_invalid", field=question.name, error=m18n.n("invalid_number")
+            "app_argument_invalid", field=self.name, error=m18n.n("invalid_number")
         )
 
 
-class DisplayTextArgumentParser(YunoHostArgumentFormatParser):
+class DisplayTextQuestion(Question):
     argument_type = "display_text"
     readonly = True
 
-    def parse_question(self, question, user_answers):
-        question_parsed = super().parse_question(question, user_answers)
+    def __init__(self, question, user_answers):
+        super().__init__(question, user_answers)
 
-        question_parsed.optional = True
-        question_parsed.style = question.get("style", "info")
+        self.optional = True
+        self.style =  question.get("style", "info")
 
-        return question_parsed
 
-    def _format_text_for_user_input_in_cli(self, question):
-        text = question.ask["en"]
+    def _format_text_for_user_input_in_cli(self):
+        text = self.ask["en"]
 
-        if question.style in ["success", "info", "warning", "danger"]:
+        if self.style in ["success", "info", "warning", "danger"]:
             color = {
                 "success": "green",
                 "info": "cyan",
                 "warning": "yellow",
                 "danger": "red",
             }
-            return colorize(m18n.g(question.style), color[question.style]) + f" {text}"
+            return colorize(m18n.g(self.style), color[self.style]) + f" {text}"
         else:
             return text
 
 
-class FileArgumentParser(YunoHostArgumentFormatParser):
+class FileQuestion(Question):
     argument_type = "file"
     upload_dirs = []
 
@@ -705,71 +774,58 @@ class FileArgumentParser(YunoHostArgumentFormatParser):
                 if os.path.exists(upload_dir):
                     shutil.rmtree(upload_dir)
 
-    def parse_question(self, question, user_answers):
-        question_parsed = super().parse_question(question, user_answers)
+    def __init__(self, question, user_answers):
+        super().__init__(question, user_answers)
         if question.get("accept"):
-            question_parsed.accept = question.get("accept").replace(" ", "").split(",")
+            self.accept = question.get("accept").replace(" ", "").split(",")
         else:
-            question_parsed.accept = []
-        if Moulinette.interface.type == "api":
-            if user_answers.get(f"{question_parsed.name}[name]"):
-                question_parsed.value = {
-                    "content": question_parsed.value,
-                    "filename": user_answers.get(
-                        f"{question_parsed.name}[name]", question_parsed.name
-                    ),
+            self.accept = []
+        if Moulinette.interface.type== "api":
+            if user_answers.get(f"{self.name}[name]"):
+                self.value = {
+                    "content": self.value,
+                    "filename": user_answers.get(f"{self.name}[name]", self.name),
                 }
         # If path file are the same
-        if (
-            question_parsed.value
-            and str(question_parsed.value) == question_parsed.current_value
-        ):
-            question_parsed.value = None
+        if self.value and str(self.value) == self.current_value:
+            self.value = None
 
-        return question_parsed
 
-    def _prevalidate(self, question):
-        super()._prevalidate(question)
-        if (
-            isinstance(question.value, str)
-            and question.value
-            and not os.path.exists(question.value)
-        ):
+    def _prevalidate(self):
+        super()._prevalidate()
+        if isinstance(self.value, str) and self.value and not os.path.exists(self.value):
             raise YunohostValidationError(
                 "app_argument_invalid",
-                field=question.name,
+                field=self.name,
                 error=m18n.n("file_does_not_exists"),
             )
-        if question.value in [None, ""] or not question.accept:
+        if self.value in [None, ""] or not self.accept:
             return
 
-        filename = (
-            question.value
-            if isinstance(question.value, str)
-            else question.value["filename"]
-        )
-        if "." not in filename or "." + filename.split(".")[-1] not in question.accept:
+        filename = self.value if isinstance(self.value, str) else self.value["filename"]
+        if "." not in filename or "." + filename.split(".")[-1] not in self.accept:
             raise YunohostValidationError(
                 "app_argument_invalid",
-                field=question.name,
+                field=self.name,
                 error=m18n.n("file_extension_not_accepted"),
             )
 
-    def _post_parse_value(self, question):
+
+    def _post_parse_value(self):
         from base64 import b64decode
 
         # Upload files from API
         # A file arg contains a string with "FILENAME:BASE64_CONTENT"
-        if not question.value:
-            return question.value
+        if not self.value:
+            return self.value
 
         if Moulinette.interface.type == "api":
 
             upload_dir = tempfile.mkdtemp(prefix="tmp_configpanel_")
-            FileArgumentParser.upload_dirs += [upload_dir]
-            filename = question.value["filename"]
+            FileQuestion.upload_dirs += [upload_dir]
+            filename = self.value["filename"]
             logger.debug(
-                f"Save uploaded file {question.value['filename']} from API into {upload_dir}"
+                f"Save uploaded file {self.value['filename']} from API into {upload_dir}"
             )
 
             # Filename is given by user of the API. For security reason, we have replaced
@@ -782,35 +838,35 @@ class FileArgumentParser(YunoHostArgumentFormatParser):
             while os.path.exists(file_path):
                 file_path = os.path.normpath(upload_dir + "/" + filename + (".%d" % i))
                 i += 1
-            content = question.value["content"]
+            content = self.value["content"]
 
             write_to_file(file_path, b64decode(content), file_mode="wb")
 
-            question.value = file_path
-        return question.value
+            self.value = file_path
+        return self.value
 
 
 ARGUMENTS_TYPE_PARSERS = {
-    "string": StringArgumentParser,
-    "text": StringArgumentParser,
-    "select": StringArgumentParser,
-    "tags": TagsArgumentParser,
-    "email": StringArgumentParser,
-    "url": StringArgumentParser,
-    "date": StringArgumentParser,
-    "time": StringArgumentParser,
-    "color": StringArgumentParser,
-    "password": PasswordArgumentParser,
-    "path": PathArgumentParser,
-    "boolean": BooleanArgumentParser,
-    "domain": DomainArgumentParser,
-    "user": UserArgumentParser,
-    "number": NumberArgumentParser,
-    "range": NumberArgumentParser,
-    "display_text": DisplayTextArgumentParser,
-    "alert": DisplayTextArgumentParser,
-    "markdown": DisplayTextArgumentParser,
-    "file": FileArgumentParser,
+    "string": StringQuestion,
+    "text": StringQuestion,
+    "select": StringQuestion,
+    "tags": TagsQuestion,
+    "email": StringQuestion,
+    "url": StringQuestion,
+    "date": StringQuestion,
+    "time": StringQuestion,
+    "color": StringQuestion,
+    "password": PasswordQuestion,
+    "path": PathQuestion,
+    "boolean": BooleanQuestion,
+    "domain": DomainQuestion,
+    "user": UserQuestion,
+    "number": NumberQuestion,
+    "range": NumberQuestion,
+    "display_text": DisplayTextQuestion,
+    "alert": DisplayTextQuestion,
+    "markdown": DisplayTextQuestion,
+    "file": FileQuestion,
 }
 
 
@@ -828,10 +884,11 @@ def parse_args_in_yunohost_format(user_answers, argument_questions):
     parsed_answers_dict = OrderedDict()
 
     for question in argument_questions:
-        parser = ARGUMENTS_TYPE_PARSERS[question.get("type", "string")]()
+        question_class = ARGUMENTS_TYPE_PARSERS[question.get("type", "string")]
+        question = question_class(question, user_answers)
 
-        answer = parser.parse(question=question, user_answers=user_answers)
+        answer = question.ask_if_needed()
         if answer is not None:
-            parsed_answers_dict[question["name"]] = answer
+            parsed_answers_dict[question.name] = answer
 
     return parsed_answers_dict