Refactored Node.get_absolute_url and related functions (such as MultiView.reverse...

[philo.git] / models / nodes.py

diff --git a/models/nodes.py b/models/nodes.py
index 6bdc85d..ab8adf7 100644 (file)
--- a/models/nodes.py
+++ b/models/nodes.py
@@ -1,48 +1,216 @@
 from django.db import models
 from django.db import models

-from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes import generic
+from django.contrib.sites.models import Site, RequestSite
+from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404

 from django.core.servers.basehttp import FileWrapper
 from django.core.servers.basehttp import FileWrapper

-from philo.models.base import InheritableTreeEntity
+from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch
+from django.template import add_to_builtins as register_templatetags
+from inspect import getargspec
+from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED
+from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model
+from philo.utils import ContentTypeSubclassLimiter

 from philo.validators import RedirectValidator
 from philo.validators import RedirectValidator

+from philo.exceptions import ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths, AncestorDoesNotExist
+from philo.signals import view_about_to_render, view_finished_rendering

 
 
 
 

-class Node(InheritableTreeEntity):
-       accepts_subpath = False
+_view_content_type_limiter = ContentTypeSubclassLimiter(None)
+
+
+class Node(TreeEntity):
+       view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter)
+       view_object_id = models.PositiveIntegerField()
+       view = generic.GenericForeignKey('view_content_type', 'view_object_id')
+       
+       @property
+       def accepts_subpath(self):
+               if self.view:
+                       return self.view.accepts_subpath
+               return False
+       
+       def handles_subpath(self, subpath):
+               return self.view.handles_subpath(subpath)
+       
+       def render_to_response(self, request, extra_context=None):
+               return self.view.render_to_response(request, extra_context)

        
        

-       def render_to_response(self, request, path=None, subpath=None):
-               return HttpResponseServerError()
+       def get_absolute_url(self, request=None, with_domain=False, secure=False):
+               return self.construct_url(request=request, with_domain=with_domain, secure=secure)
+       
+       def construct_url(self, subpath=None, request=None, with_domain=False, secure=False):
+               """
+               This method will construct a URL based on the Node's location.
+               If a request is passed in, that will be used as a backup in case
+               the Site lookup fails. The Site lookup takes precedence because
+               it's what's used to find the root node. This will raise:
+               - NoReverseMatch if philo-root is not reverseable
+               - Site.DoesNotExist if a domain is requested but not buildable.
+               - AncestorDoesNotExist if the root node of the site isn't an
+                 ancestor of this instance.
+               """
+               # Try reversing philo-root first, since we can't do anything if that fails.
+               root_url = reverse('philo-root')
+               
+               try:
+                       current_site = Site.objects.get_current()
+               except Site.DoesNotExist:
+                       if request is not None:
+                               current_site = RequestSite(request)
+                       elif with_domain:
+                               # If they want a domain and we can't figure one out,
+                               # best to reraise the error to let them know.
+                               raise
+                       else:
+                               current_site = None
+               
+               root = getattr(current_site, 'root_node', None)
+               path = self.get_path(root=root)

                
                

+               if current_site and with_domain:
+                       domain = "http%s://%s" % (secure and "s" or "", current_site.domain)
+               else:
+                       domain = ""
+               
+               if not path:
+                       subpath = subpath[1:]
+               
+               return '%s%s%s%s' % (domain, root_url, path, subpath or "")
+       

        class Meta:
        class Meta:

-               unique_together = (('parent', 'slug'),)

                app_label = 'philo'
 
 
                app_label = 'philo'
 
 

-class MultiNode(Node):
+# the following line enables the selection of a node as the root for a given django.contrib.sites Site object
+models.ForeignKey(Node, related_name='sites', null=True, blank=True).contribute_to_class(Site, 'root_node')
+
+
+class View(Entity):
+       nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id')
+       
+       accepts_subpath = False
+       
+       def handles_subpath(self, subpath):
+               if not self.accepts_subpath and subpath != "/":
+                       return False
+               return True
+       
+       def reverse(self, view_name=None, args=None, kwargs=None, node=None, obj=None):
+               """Shortcut method to handle the common pattern of getting the
+               absolute url for a view's subpaths."""
+               if not self.accepts_subpath:
+                       raise ViewDoesNotProvideSubpaths
+               
+               if obj is not None:
+                       # Perhaps just override instead of combining?
+                       obj_view_name, obj_args, obj_kwargs = self.get_reverse_params(obj)
+                       if view_name is None:
+                               view_name = obj_view_name
+                       args = list(obj_args) + list(args or [])
+                       obj_kwargs.update(kwargs or {})
+                       kwargs = obj_kwargs
+               
+               try:
+                       subpath = reverse(view_name, urlconf=self, args=args or [], kwargs=kwargs or {})
+               except NoReverseMatch:
+                       raise ViewCanNotProvideSubpath
+               
+               if node is not None:
+                       return node.construct_url(subpath)
+               return subpath
+       
+       def get_reverse_params(self, obj):
+               """This method should return a view_name, args, kwargs tuple suitable for reversing a url for the given obj using self as the urlconf."""
+               raise NotImplementedError("View subclasses must implement get_reverse_params to support subpaths.")
+       
+       def attributes_with_node(self, node):
+               return QuerySetMapper(self.attribute_set, passthrough=node.attributes)
+       
+       def render_to_response(self, request, extra_context=None):
+               if not hasattr(request, 'node'):
+                       raise MIDDLEWARE_NOT_CONFIGURED
+               
+               extra_context = extra_context or {}
+               view_about_to_render.send(sender=self, request=request, extra_context=extra_context)
+               response = self.actually_render_to_response(request, extra_context)
+               view_finished_rendering.send(sender=self, response=response)
+               return response
+       
+       def actually_render_to_response(self, request, extra_context=None):
+               raise NotImplementedError('View subclasses must implement actually_render_to_response.')
+       
+       class Meta:
+               abstract = True
+
+
+_view_content_type_limiter.cls = View
+
+
+class MultiView(View):

        accepts_subpath = True
        
        accepts_subpath = True
        

-       urlpatterns = []
+       @property
+       def urlpatterns(self):
+               raise NotImplementedError("MultiView subclasses must implement urlpatterns.")

        
        

-       def render_to_response(self, request, path=None, subpath=None):
-               if not subpath:
-                       subpath = ""
-               subpath = "/" + subpath
-               from django.core.urlresolvers import resolve
+       def handles_subpath(self, subpath):
+               if not super(MultiView, self).handles_subpath(subpath):
+                       return False
+               try:
+                       resolve(subpath, urlconf=self)
+               except Http404:
+                       return False
+               return True
+       
+       def actually_render_to_response(self, request, extra_context=None):
+               clear_url_caches()
+               subpath = request.node.subpath

                view, args, kwargs = resolve(subpath, urlconf=self)
                view, args, kwargs = resolve(subpath, urlconf=self)

+               view_args = getargspec(view)
+               if extra_context is not None and ('extra_context' in view_args[0] or view_args[2] is not None):
+                       if 'extra_context' in kwargs:
+                               extra_context.update(kwargs['extra_context'])
+                       kwargs['extra_context'] = extra_context

                return view(request, *args, **kwargs)
        
                return view(request, *args, **kwargs)
        

+       def get_context(self):
+               """Hook for providing instance-specific context - such as the value of a Field - to all views."""
+               return {}
+       
+       def basic_view(self, field_name):
+               """
+               Given the name of a field on ``self``, accesses the value of
+               that field and treats it as a ``View`` instance. Creates a
+               basic context based on self.get_context() and any extra_context
+               that was passed in, then calls the ``View`` instance's
+               render_to_response() method. This method is meant to be called
+               to return a view function appropriate for urlpatterns.
+               """
+               field = self._meta.get_field(field_name)
+               view = getattr(self, field.name, None)
+               
+               def inner(request, extra_context=None, **kwargs):
+                       if not view:
+                               raise Http404
+                       context = self.get_context()
+                       context.update(extra_context or {})
+                       return view.render_to_response(request, extra_context=context)
+               
+               return inner
+       

        class Meta:
                abstract = True
        class Meta:
                abstract = True

-               app_label = 'philo'

 
 
 
 

-class Redirect(Node):
+class Redirect(View):

        STATUS_CODES = (
                (302, 'Temporary'),
                (301, 'Permanent'),
        )
        STATUS_CODES = (
                (302, 'Temporary'),
                (301, 'Permanent'),
        )

-       target = models.CharField(max_length=200,validators=[RedirectValidator()])
+       target = models.CharField(max_length=200, validators=[RedirectValidator()])

        status_code = models.IntegerField(choices=STATUS_CODES, default=302, verbose_name='redirect type')
        
        status_code = models.IntegerField(choices=STATUS_CODES, default=302, verbose_name='redirect type')
        

-       def render_to_response(self, request, path=None, subpath=None):
+       def actually_render_to_response(self, request, extra_context=None):

                response = HttpResponseRedirect(self.target)
                response.status_code = self.status_code
                return response
                response = HttpResponseRedirect(self.target)
                response.status_code = self.status_code
                return response


@@ -51,16 +219,24 @@ class Redirect(Node):
                app_label = 'philo'
 
 
                app_label = 'philo'
 
 

-class File(Node):
+class File(View):

        """ For storing arbitrary files """
        """ For storing arbitrary files """

+       

        mimetype = models.CharField(max_length=255)
        file = models.FileField(upload_to='philo/files/%Y/%m/%d')
        
        mimetype = models.CharField(max_length=255)
        file = models.FileField(upload_to='philo/files/%Y/%m/%d')
        

-       def render_to_response(self, request, path=None, subpath=None):
+       def actually_render_to_response(self, request, extra_context=None):

                wrapper = FileWrapper(self.file)
                response = HttpResponse(wrapper, content_type=self.mimetype)
                response['Content-Length'] = self.file.size
                return response
        
        class Meta:
                wrapper = FileWrapper(self.file)
                response = HttpResponse(wrapper, content_type=self.mimetype)
                response['Content-Length'] = self.file.size
                return response
        
        class Meta:

-               app_label = 'philo'
\ No newline at end of file
+               app_label = 'philo'
+       
+       def __unicode__(self):
+               return self.file.name
+
+
+register_templatetags('philo.templatetags.nodes')
+register_value_model(Node)
\ No newline at end of file