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"""Django admin support for treebeard"""
import sys
from django.conf import settings
from django.contrib import admin, messages
from django.core.exceptions import PermissionDenied
from django.http import HttpResponse, HttpResponseBadRequest
from django.urls import path
from django.utils.encoding import force_str
from django.utils.translation import gettext_lazy as _
from treebeard.al_tree import AL_Node
from treebeard.exceptions import InvalidMoveToDescendant, InvalidPosition, MissingNodeOrderBy, PathOverflow
def check_empty_dict(GET_dict):
"""
Returns True if the GET query string contains no values, but it can contain
empty keys.
This is better than doing not bool(request.GET) as an empty key will return True
"""
for k, v in GET_dict.items():
# Don't disable on p(age) or 'all' GET param
if v and (k not in ["p", "all"]):
return False
return True
class TreeAdmin(admin.ModelAdmin):
"""Django Admin class for treebeard."""
change_list_template = "admin/tree_change_list.html"
def get_queryset(self, request):
if issubclass(self.model, AL_Node):
# AL Trees return a list instead of a QuerySet for .get_tree()
# So we're returning the regular .get_queryset cause we will use
# the old admin
return super().get_queryset(request)
else:
return self.model.get_tree()
def changelist_view(self, request, extra_context=None):
if issubclass(self.model, AL_Node):
# For AL trees, use the old admin display
self.change_list_template = "admin/tree_list.html"
if extra_context is None:
extra_context = {}
request_context = any(
map(
lambda tmpl: tmpl.get("BACKEND", None) == "django.template.backends.django.DjangoTemplates"
and tmpl.get("APP_DIRS", False)
and "django.template.context_processors.request"
in tmpl.get("OPTIONS", {}).get("context_processors", []),
settings.TEMPLATES,
)
)
lacks_request = "request" not in extra_context and not request_context
if lacks_request:
extra_context["request"] = request
extra_context["has_change_permission"] = self.has_change_permission(request)
extra_context["filtered"] = not check_empty_dict(request.GET)
return super().changelist_view(request, extra_context)
def get_urls(self):
"""
Adds a url to move nodes to this admin
"""
urls = super().get_urls()
from django.views.i18n import JavaScriptCatalog
jsi18n_url = path("jsi18n/", JavaScriptCatalog.as_view(packages=["treebeard"]), name="javascript-catalog")
new_urls = [
path(
"move/",
self.admin_site.admin_view(self.move_node),
),
jsi18n_url,
]
return new_urls + urls
def get_node(self, node_id):
return self.model.objects.get(pk=node_id)
def try_to_move_node(self, as_child, node, pos, request, target):
try:
node.move(target, pos=pos)
# Call the save method on the (reloaded) node in order to trigger
# possible signal handlers etc.
node = self.get_node(node.pk)
node.save()
except (MissingNodeOrderBy, PathOverflow, InvalidMoveToDescendant, InvalidPosition):
e = sys.exc_info()[1]
# An error was raised while trying to move the node, then set an
# error message and return 400, this will cause a reload on the
# client to show the message
messages.error(request, _("Exception raised while moving node: %s") % _(force_str(e)))
return HttpResponseBadRequest("Exception raised during move")
if as_child:
msg = _('Moved node "%(node)s" as child of "%(other)s"')
else:
msg = _('Moved node "%(node)s" as sibling of "%(other)s"')
messages.info(request, msg % {"node": node, "other": target})
return HttpResponse("OK")
def move_node(self, request):
try:
node_id = request.POST["node_id"]
target_id = request.POST["sibling_id"]
as_child = bool(int(request.POST.get("as_child", 0)))
except (KeyError, ValueError):
# Some parameters were missing return a BadRequest
return HttpResponseBadRequest("Malformed POST params")
node = self.get_node(node_id)
if not self.has_change_permission(request, node):
# The JS will trigger a page reload on error. This message will be displayed after reload.
messages.error(request, _("You do not have permission to change this object."))
raise PermissionDenied
target = self.get_node(target_id)
is_sorted = True if node.node_order_by else False
pos = {
(True, True): "sorted-child",
(True, False): "last-child",
(False, True): "sorted-sibling",
(False, False): "left",
}[as_child, is_sorted]
return self.try_to_move_node(as_child, node, pos, request, target)
def admin_factory(form_class):
"""Dynamically build a TreeAdmin subclass for the given form class.
:param form_class:
:return: A TreeAdmin subclass.
"""
return type(form_class.__name__ + "Admin", (TreeAdmin,), dict(form=form_class))
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