Handlers

Warning

This is an internal API and should be used only for extend/customise core behaviours.

classDiagram
    BaseExtraHandler <-- ViewHandler
    ButtonMixin <-- ButtonHandler
    ViewHandler <-- ButtonHandler

    ButtonMixin <-- LinkHandler
    BaseExtraHandler <-- LinkHandler

    LinkHandler <-- ChoiceHandler

    Button <-- LinkButton
    LinkButton <-- ChoiceButton

admin_extra_buttons.handlers.BaseExtraHandler

Source code in src/admin_extra_buttons/handlers.py

class BaseExtraHandler:
    def __init__(self, func: HandlerFunction, **kwargs: Any) -> None:
        self.func: HandlerFunction = func
        self.url_name: str = ""
        self.func.extra_buttons_handler = self
        self.config = kwargs
        self.model_admin: "ExtraButtonsMixin" = kwargs.get("model_admin")  # type:ignore[assignment]
        self.decorators = kwargs.get("decorators", [])
        self.login_required = kwargs.get("login_required", True)
        self._pattern = kwargs.get("pattern", "") or ""
        self.permission: str | PermissionHandler | None = kwargs.get("permission")
        self._sig: inspect.Signature = inspect.signature(self.func)

    @cached_property
    def func_args(self) -> list[Any]:
        return list(self._sig.parameters)

    @cached_property
    def single_object_invocation(self) -> bool:
        return len(self.func_args) == 2  # noqa: PLR2004

    def __repr__(self) -> str:
        return f"<{self.__class__.__name__} {self.name}>"

    def get_instance(self, model_admin: "ExtraButtonsMixin") -> "BaseExtraHandler":
        """return a 'clone' of current Handler"""
        return self.__class__(self.func, model_admin=model_admin, **self.config)

    @cached_property
    def name(self) -> str:
        return self.func.__name__

    def __call__(
        self, model_admin: "ExtraButtonsMixin", request: HttpRequest, *args: Any, **kwargs: Any
    ) -> HttpResponseBase:
        obj = None
        self.model_admin = model_admin
        if not self.single_object_invocation:
            pk = str(kwargs.get(self.func_args[2]))
            obj = model_admin.get_object(request, pk)

        if self.permission:
            check_permission(self, self.permission, request, obj)
        elif self.login_required and not request.user.is_authenticated:
            raise PermissionDenied

        ret = self.func(model_admin, request, *args, **kwargs)

        if not isinstance(ret, HttpResponseBase):
            return HttpResponseRedirectToReferrer(request)
        return ret

admin_extra_buttons.handlers.ViewHandler

Bases: BaseExtraHandler

Source code in src/admin_extra_buttons/handlers.py

class ViewHandler(BaseExtraHandler):
    def __init__(
        self,
        func: "HandlerFunction",
        http_basic_auth: bool = False,
        http_auth_handler: Callable[[HttpRequest], AbstractBaseUser | AnonymousUser | None] | None = None,
        **kwargs: Any,
    ) -> None:
        if http_auth_handler:
            if http_basic_auth:
                raise ValueError("'http_basic_auth' and 'http_auth_handler' are mutually exclusive")
            self.http_auth_handler = http_auth_handler
            self.http_basic_auth = True
        else:
            self.http_basic_auth = http_basic_auth
            self.http_auth_handler = handle_basic_auth
        super().__init__(func, **kwargs)

    def __call__(
        self, model_admin: "ExtraButtonsMixin", request: HttpRequest, *args: Any, **kwargs: Any
    ) -> HttpResponseBase:
        self.model_admin = model_admin
        if self.login_required and self.http_basic_auth and not request.user.is_authenticated:
            self.http_auth_handler(request)
        return super().__call__(model_admin, request, *args, **kwargs)

    @cached_property
    def url_pattern(self) -> str:
        if self._pattern:
            return self._pattern
        pattern = ""
        for arg in list(self.func_args)[2:]:
            pattern += f"<path:{arg}>/"
        pattern += f"{self.name}/"
        return pattern

admin_extra_buttons.handlers.ButtonHandler

Bases: ButtonMixin, ViewHandler

View handler for @button decorated views

Source code in src/admin_extra_buttons/handlers.py

class ButtonHandler(ButtonMixin, ViewHandler):
    """View handler for `@button` decorated views"""

    button_class = ButtonWidget

    def get_button_params(self, context: RequestContext, **extra: Any) -> dict[str, Any]:
        return super().get_button_params(
            context,
            label=self.config.get("label", labelize(self.name)),
            login_required=self.login_required,
            **extra,
        )

admin_extra_buttons.handlers.LinkHandler

Bases: ButtonMixin, BaseExtraHandler

Source code in src/admin_extra_buttons/handlers.py

class LinkHandler(ButtonMixin, BaseExtraHandler):
    button_class: "type[VisibleButton]" = LinkButton
    url_pattern = None

    def __init__(self, func: HandlerFunction, **kwargs: Any) -> None:
        self.href = kwargs.pop("href", None)
        self.label = kwargs.get("label")
        super().__init__(func, href=self.href, **kwargs)

    def get_button_params(self, context: RequestContext, **extra: Any) -> dict[str, Any]:
        return super().get_button_params(
            context,
            href=self.href,
            label=self.label,
            url_pattern=self.url_pattern,
            **extra,
        )

    def get_button(self, context: "RequestContext") -> "ButtonWidget":
        params = self.get_button_params(context)
        button = self.button_class(**params)
        if not button.label:
            button.label = self.func.__name__
        self.func(self.model_admin, button)
        return button

admin_extra_buttons.handlers.ChoiceHandler

Bases: LinkHandler

Source code in src/admin_extra_buttons/handlers.py

class ChoiceHandler(LinkHandler):
    button_class: "type[VisibleButton]" = ChoiceButton

    def __init__(self, func: "HandlerFunction", **kwargs: Any) -> None:
        self.href = kwargs.pop("href", None)
        self.choices = kwargs.pop("choices", None)
        self.label = kwargs.get("label")
        self.selected_choice = None
        super().__init__(func, href=self.href, choices=self.choices, **kwargs)

    def get_button_params(self, context: RequestContext, **extra: Any) -> dict[str, Any]:
        return super().get_button_params(
            context,
            choices=self.choices,
            **extra,
        )

admin_extra_buttons.handlers.ButtonMixin

Source code in src/admin_extra_buttons/handlers.py

class ButtonMixin:
    button_class: "type[VisibleButton]" = ButtonWidget

    def __init__(
        self,
        func: "HandlerFunction",
        html_attrs: dict[str, str] | None = None,
        change_list: bool | None = None,
        change_form: bool | None = None,
        visible: bool = True,
        enabled: bool = True,
        **kwargs: Any,
    ) -> None:
        self.config = kwargs
        self.change_form = change_form
        self.change_list = change_list
        self.visible = visible
        self.enabled = enabled
        self.html_attrs = html_attrs or {}

        super().__init__(  # type:ignore[call-arg]
            func,
            change_form=change_form,
            change_list=change_list,
            html_attrs=html_attrs,
            enabled=enabled,
            visible=visible,
            **kwargs,
        )

    def get_button_params(self, context: "RequestContext", **extra: Any) -> dict[str, Any]:
        return {
            "handler": self,
            "html_attrs": self.html_attrs,
            "change_list": self.change_list,
            "change_form": self.change_form,
            "visible": self.visible,
            "enabled": self.enabled,
            "context": context,
            **extra,
        }

    def get_button(self, context: "RequestContext") -> "ButtonWidget":
        return self.button_class(**self.get_button_params(context))

admin_extra_buttons.buttons.LinkButton

Bases: ButtonWidget

Source code in src/admin_extra_buttons/buttons.py

class LinkButton(ButtonWidget):
    @property
    def url(self) -> str:
        return self.href

    def get_change_form_flag(self, arg: Any | None) -> bool:  # noqa: PLR6301
        if arg is None:
            return True
        return bool(arg)

    def get_change_list_flag(self, arg: Any | None) -> bool:  # noqa: PLR6301
        if arg is None:
            return True
        return bool(arg)

admin_extra_buttons.buttons.ChoiceButton

Bases: LinkButton

Source code in src/admin_extra_buttons/buttons.py

class ChoiceButton(LinkButton):
    default_template = "admin_extra_buttons/includes/choice.html"

    def __init__(  # noqa: PLR0917, PLR0913
        self,
        handler: "BaseExtraHandler",
        context: "RequestContext",
        label: str | None = None,
        visible: bool = True,
        enabled: bool = True,
        change_form: bool | None = None,
        change_list: bool | None = None,
        template: str | None = None,
        **config: Any,
    ) -> None:
        self.choices: list[BaseExtraHandler] = []
        super().__init__(handler, context, label, visible, enabled, change_form, change_list, template, **config)

    def get_choices(self) -> Generator[dict[str, Any], None, None]:
        for handler_config in self.choices:
            handler = handler_config.func.extra_buttons_handler
            if self.change_list and handler.single_object_invocation:
                url = reverse(f"admin:{handler.url_name}")
            elif not handler.single_object_invocation and self.change_form and self.original:
                url = reverse(f"admin:{handler.url_name}", args=[self.context["original"].pk])
            else:
                url = None
            if url:
                yield {
                    "label": handler.config.get("label", labelize(handler.name)),
                    "url": url,
                    "selected": self.request.path == url,
                }

    def can_render(self) -> bool:  # noqa: PLR6301
        return True

    @property
    def html_attrs(self) -> dict[str, str]:
        ret = super().html_attrs
        ret.setdefault("name", self.handler.name)
        return ret