244 lines
8.5 KiB
Python
244 lines
8.5 KiB
Python
from __future__ import unicode_literals
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import inspect
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import logging
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import urllib
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import urlparse
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from django.core.exceptions import PermissionDenied
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from django.core.urlresolvers import resolve, reverse
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from django.template import VariableDoesNotExist, Variable
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from django.template.defaulttags import URLNode
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from django.utils.encoding import smart_str, smart_unicode
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from django.utils.http import urlencode, urlquote
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from django.utils.translation import ugettext_lazy as _
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from acls.models import AccessEntry
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from permissions.models import Permission
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logger = logging.getLogger(__name__)
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class ResolvedLink(object):
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active = False
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description = None
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icon = None
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text = _('Unnamed link')
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url = '#'
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class Menu(object):
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# TODO: Add support for position #{'link': links, 'position': position})
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_registry = {}
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@classmethod
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def get(cls, name):
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return cls._registry[name]
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def __init__(self, name):
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if name in self.__class__._registry:
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raise Exception('A menu with this name already exists')
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self.name = name
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self.bound_links = {}
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self.__class__._registry[name] = self
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def _add_links_to_source(self, links, source, position=None):
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source_links = self.bound_links.setdefault(source, [])
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for link in links:
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source_links.append(link)
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def bind_links(self, links, sources=None, position=None):
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"""
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Associate a link to a model, a view inside this menu
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"""
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if sources:
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for source in sources:
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self._add_links_to_source(links, source)
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else:
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# Unsourced links display always
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self._add_links_to_source(links, None)
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def resolve(self, context, source=None):
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request = Variable('request').resolve(context)
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current_path = request.META['PATH_INFO']
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# Get sources: view name, view objects
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current_view = resolve(current_path).view_name
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resolved_navigation_object_list = []
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result = []
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if source:
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resolved_navigation_object_list = [source]
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else:
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navigation_object_list = context.get('navigation_object_list', ['object'])
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# Multiple objects
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for navigation_object in navigation_object_list:
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try:
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resolved_navigation_object_list.append(Variable(navigation_object).resolve(context))
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except VariableDoesNotExist:
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pass
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for resolved_navigation_object in resolved_navigation_object_list:
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for source, links in self.bound_links.iteritems():
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try:
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if inspect.isclass(source) and isinstance(resolved_navigation_object, source) or source == CombinedSource(obj=resolved_navigation_object.__class__, view=current_view):
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for link in links:
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resolved_link = link.resolve(context=context, resolved_object=resolved_navigation_object)
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if resolved_link:
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result.append(resolved_link)
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break # No need for further content object match testing
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except TypeError:
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# When source is a dictionary
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pass
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# View links
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for link in self.bound_links.get(current_view, []):
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resolved_link = link.resolve(context)
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if resolved_link:
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result.append(resolved_link)
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# Main menu links
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for link in self.bound_links.get(None, []):
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resolved_link = link.resolve(context)
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if resolved_link:
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result.append(resolved_link)
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return result
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class Link(object):
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def __init__(self, text, view, args=None, condition=None,
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conditional_disable=None, description=None, icon=None,
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keep_query=False, klass=None, kwargs=None, permissions=None,
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remove_from_query=None):
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self.args = args or []
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self.condition = condition
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self.conditional_disable = conditional_disable
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self.description = description
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self.icon = icon
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self.keep_query = keep_query
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self.klass = klass
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self.kwargs = kwargs or {}
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self.permissions = permissions or []
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self.remove_from_query = remove_from_query or []
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self.text = text
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self.view = view
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def resolve(self, context, resolved_object=None):
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request = Variable('request').resolve(context)
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current_path = request.META['PATH_INFO']
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current_view = resolve(current_path).view_name
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# If this link has a required permission check that the user have it
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# too
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if self.permissions:
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try:
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Permission.objects.check_permissions(request.user, self.permissions)
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except PermissionDenied:
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# If the user doesn't have the permission, and we are passed
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# an instance, check to see if the user has at least ACL
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# access to the instance.
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if resolved_object:
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try:
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AccessEntry.objects.check_access(self.permissions, request.user, resolved_object)
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except PermissionDenied:
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return None
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else:
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return None
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# Check to see if link has conditional display function and only
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# display it if the result of the conditional display function is
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# True
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if self.condition:
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if not self.condition(context):
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return None
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resolved_link = ResolvedLink()
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resolved_link.description = self.description
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resolved_link.icon = self.icon
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resolved_link.klass = self.klass
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resolved_link.text = self.text
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view_name = Variable('"{}"'.format(self.view))
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if isinstance(self.args, list):
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args = [Variable(arg) for arg in self.args]
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else:
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args = [Variable(self.args)]
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kwargs = {key: Variable(value) for key, value in self.kwargs.iteritems()}
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# Use Django's exact {% url %} code to resolve the link
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node = URLNode(view_name=view_name, args=args, kwargs={}, asvar=None)
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# If we were passed an instance of the view context object we are
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# resolving, inject it into the context. This help resolve links for
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# object lists.
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if resolved_object:
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context['resolved_object'] = resolved_object
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resolved_link.url = node.render(context)
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# This is for links that should be displayed but that are not clickable
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if self.conditional_disable:
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resolved_link.disabled = self.conditional_disable(context)
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else:
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resolved_link.disabled = False
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# Lets a new link keep the same URL query string of the current URL
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if self.keep_query:
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# Sometimes we are required to remove a key from the URL QS
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previous_path = smart_unicode(urllib.unquote_plus(smart_str(request.get_full_path()) or smart_str(request.META.get('HTTP_REFERER', reverse(settings.LOGIN_REDIRECT_URL)))))
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query_string = urlparse.urlparse(previous_path).query
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parsed_query_string = urlparse.parse_qs(query_string)
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for key in self.remove_from_query:
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try:
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del parsed_query_string[key]
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except KeyError:
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pass
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resolved_link.url = '%s?%s' % (urlquote(resolved_link.url), urlencode(parsed_query_string, doseq=True))
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# Helps highligh in the UI the current link in effect
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resolved_link.active = self.view == current_view
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return resolved_link
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class ModelListColumn(object):
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_model_list_columns = {}
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@classmethod
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def get_model(cls, model):
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return cls._model_list_columns.get(model)
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def __init__(self, model, name, attribute):
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self.__class__._model_list_columns.setdefault(model, [])
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self.__class__._model_list_columns[model].extend(columns)
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class CombinedSource(object):
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"""
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Class that binds a link to a combination of an object and a view.
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This is used to show links relating to a specific object type but only
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in certain views.
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Used by the PageDocument class to show rotatio and zoom link only on
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certain views
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"""
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def __init__(self, obj, view):
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self.obj = obj
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self.view = view
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def __hash__(self):
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return hash((self.obj, self.view))
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def __eq__(self, other):
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return hash(self) == hash(other)
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