1 from inspect import getargspec
3 from django.contrib.contenttypes import generic
4 from django.contrib.contenttypes.models import ContentType
5 from django.contrib.sites.models import Site, RequestSite
6 from django.core.exceptions import ValidationError
7 from django.core.servers.basehttp import FileWrapper
8 from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch
9 from django.db import models
10 from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404
11 from django.template import add_to_builtins as register_templatetags
12 from django.utils.encoding import smart_str
14 from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED, ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths
15 from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model
16 from philo.models.fields import JSONField
17 from philo.utils import ContentTypeSubclassLimiter
18 from philo.validators import RedirectValidator
19 from philo.signals import view_about_to_render, view_finished_rendering
22 _view_content_type_limiter = ContentTypeSubclassLimiter(None)
25 class Node(TreeEntity):
26 view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter)
27 view_object_id = models.PositiveIntegerField()
28 view = generic.GenericForeignKey('view_content_type', 'view_object_id')
31 def accepts_subpath(self):
33 return self.view.accepts_subpath
36 def handles_subpath(self, subpath):
37 return self.view.handles_subpath(subpath)
39 def render_to_response(self, request, extra_context=None):
40 return self.view.render_to_response(request, extra_context)
42 def get_absolute_url(self, request=None, with_domain=False, secure=False):
43 return self.construct_url(request=request, with_domain=with_domain, secure=secure)
45 def construct_url(self, subpath="/", request=None, with_domain=False, secure=False):
47 This method will construct a URL based on the Node's location.
48 If a request is passed in, that will be used as a backup in case
49 the Site lookup fails. The Site lookup takes precedence because
50 it's what's used to find the root node. This will raise:
51 - NoReverseMatch if philo-root is not reverseable
52 - Site.DoesNotExist if a domain is requested but not buildable.
53 - AncestorDoesNotExist if the root node of the site isn't an
54 ancestor of this instance.
56 # Try reversing philo-root first, since we can't do anything if that fails.
57 root_url = reverse('philo-root')
60 current_site = Site.objects.get_current()
61 except Site.DoesNotExist:
62 if request is not None:
63 current_site = RequestSite(request)
65 # If they want a domain and we can't figure one out,
66 # best to reraise the error to let them know.
71 root = getattr(current_site, 'root_node', None)
72 path = self.get_path(root=root)
74 if current_site and with_domain:
75 domain = "http%s://%s" % (secure and "s" or "", current_site.domain)
79 if not path or subpath == "/":
82 return '%s%s%s%s' % (domain, root_url, path, subpath)
88 # the following line enables the selection of a node as the root for a given django.contrib.sites Site object
89 models.ForeignKey(Node, related_name='sites', null=True, blank=True).contribute_to_class(Site, 'root_node')
93 nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id')
95 accepts_subpath = False
97 def handles_subpath(self, subpath):
98 if not self.accepts_subpath and subpath != "/":
102 def reverse(self, view_name=None, args=None, kwargs=None, node=None, obj=None):
103 """Shortcut method to handle the common pattern of getting the
104 absolute url for a view's subpaths."""
105 if not self.accepts_subpath:
106 raise ViewDoesNotProvideSubpaths
109 # Perhaps just override instead of combining?
110 obj_view_name, obj_args, obj_kwargs = self.get_reverse_params(obj)
111 if view_name is None:
112 view_name = obj_view_name
113 args = list(obj_args) + list(args or [])
114 obj_kwargs.update(kwargs or {})
118 subpath = reverse(view_name, urlconf=self, args=args or [], kwargs=kwargs or {})
119 except NoReverseMatch, e:
120 raise ViewCanNotProvideSubpath(e.message)
123 return node.construct_url(subpath)
126 def get_reverse_params(self, obj):
127 """This method should return a view_name, args, kwargs tuple suitable for reversing a url for the given obj using self as the urlconf."""
128 raise NotImplementedError("View subclasses must implement get_reverse_params to support subpaths.")
130 def attributes_with_node(self, node):
131 return QuerySetMapper(self.attribute_set, passthrough=node.attributes)
133 def render_to_response(self, request, extra_context=None):
134 if not hasattr(request, 'node'):
135 raise MIDDLEWARE_NOT_CONFIGURED
137 extra_context = extra_context or {}
138 view_about_to_render.send(sender=self, request=request, extra_context=extra_context)
139 response = self.actually_render_to_response(request, extra_context)
140 view_finished_rendering.send(sender=self, response=response)
143 def actually_render_to_response(self, request, extra_context=None):
144 raise NotImplementedError('View subclasses must implement actually_render_to_response.')
150 _view_content_type_limiter.cls = View
153 class MultiView(View):
154 accepts_subpath = True
157 def urlpatterns(self):
158 raise NotImplementedError("MultiView subclasses must implement urlpatterns.")
160 def handles_subpath(self, subpath):
161 if not super(MultiView, self).handles_subpath(subpath):
164 resolve(subpath, urlconf=self)
169 def actually_render_to_response(self, request, extra_context=None):
171 subpath = request.node.subpath
172 view, args, kwargs = resolve(subpath, urlconf=self)
173 view_args = getargspec(view)
174 if extra_context is not None and ('extra_context' in view_args[0] or view_args[2] is not None):
175 if 'extra_context' in kwargs:
176 extra_context.update(kwargs['extra_context'])
177 kwargs['extra_context'] = extra_context
178 return view(request, *args, **kwargs)
180 def get_context(self):
181 """Hook for providing instance-specific context - such as the value of a Field - to all views."""
184 def basic_view(self, field_name):
186 Given the name of a field on ``self``, accesses the value of
187 that field and treats it as a ``View`` instance. Creates a
188 basic context based on self.get_context() and any extra_context
189 that was passed in, then calls the ``View`` instance's
190 render_to_response() method. This method is meant to be called
191 to return a view function appropriate for urlpatterns.
193 field = self._meta.get_field(field_name)
194 view = getattr(self, field.name, None)
196 def inner(request, extra_context=None, **kwargs):
199 context = self.get_context()
200 context.update(extra_context or {})
201 return view.render_to_response(request, extra_context=context)
209 class TargetURLModel(models.Model):
210 target_node = models.ForeignKey(Node, blank=True, null=True, related_name="%(app_label)s_%(class)s_related")
211 url_or_subpath = models.CharField(max_length=200, validators=[RedirectValidator()], blank=True, help_text="Point to this url or, if a node is defined and accepts subpaths, this subpath of the node.")
212 reversing_parameters = JSONField(blank=True, help_text="If reversing parameters are defined, url_or_subpath will instead be interpreted as the view name to be reversed.")
215 if not self.target_node and not self.url_or_subpath:
216 raise ValidationError("Either a target node or a url must be defined.")
218 if self.reversing_parameters and not (self.url_or_subpath or self.target_node):
219 raise ValidationError("Reversing parameters require either a view name or a target node.")
222 self.get_target_url()
223 except (NoReverseMatch, ViewCanNotProvideSubpath), e:
224 raise ValidationError(e.message)
226 super(TargetURLModel, self).clean()
228 def get_reverse_params(self):
229 params = self.reversing_parameters
231 if isinstance(params, list):
233 elif isinstance(params, dict):
234 # Convert unicode keys to strings for Python < 2.6.5. Compare
235 # http://stackoverflow.com/questions/4598604/how-to-pass-unicode-keywords-to-kwargs
236 kwargs = dict([(smart_str(k, 'ascii'), v) for k, v in params.items()])
237 return self.url_or_subpath, args, kwargs
239 def get_target_url(self):
240 node = self.target_node
241 if node is not None and node.accepts_subpath and self.url_or_subpath:
242 if self.reversing_parameters is not None:
243 view_name, args, kwargs = self.get_reverse_params()
244 subpath = node.view.reverse(view_name, args=args, kwargs=kwargs)
246 subpath = self.url_or_subpath
247 if subpath[0] != '/':
248 subpath = '/' + subpath
249 return node.construct_url(subpath)
250 elif node is not None:
251 return node.get_absolute_url()
253 if self.reversing_parameters is not None:
254 view_name, args, kwargs = self.get_reverse_params()
255 return reverse(view_name, args=args, kwargs=kwargs)
256 return self.url_or_subpath
257 target_url = property(get_target_url)
263 class Redirect(TargetURLModel, View):
268 status_code = models.IntegerField(choices=STATUS_CODES, default=302, verbose_name='redirect type')
270 def actually_render_to_response(self, request, extra_context=None):
271 response = HttpResponseRedirect(self.target_url)
272 response.status_code = self.status_code
280 """ For storing arbitrary files """
282 mimetype = models.CharField(max_length=255)
283 file = models.FileField(upload_to='philo/files/%Y/%m/%d')
285 def actually_render_to_response(self, request, extra_context=None):
286 wrapper = FileWrapper(self.file)
287 response = HttpResponse(wrapper, content_type=self.mimetype)
288 response['Content-Length'] = self.file.size
294 def __unicode__(self):
295 return self.file.name
298 register_templatetags('philo.templatetags.nodes')
299 register_value_model(Node)