X-Git-Url: http://git.ithinksw.org/philo.git/blobdiff_plain/957c1a654f871388f37195315b6797bfbcda6a5e..eeb8a55da97f1b778b78324190f502c4cf7da77c:/philo/models/nodes.py diff --git a/philo/models/nodes.py b/philo/models/nodes.py index 0765f8c..7371a1d 100644 --- a/philo/models/nodes.py +++ b/philo/models/nodes.py @@ -1,50 +1,63 @@ from inspect import getargspec +import mimetypes +from os.path import basename +from django.conf import settings from django.contrib.contenttypes import generic from django.contrib.contenttypes.models import ContentType from django.contrib.sites.models import Site, RequestSite +from django.core.cache import cache from django.core.exceptions import ValidationError from django.core.servers.basehttp import FileWrapper from django.core.urlresolvers import resolve, clear_url_caches, reverse, NoReverseMatch from django.db import models from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404 -from django.template import add_to_builtins as register_templatetags from django.utils.encoding import smart_str from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED, ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths -from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model +from philo.models.base import SlugTreeEntity, Entity, register_value_model from philo.models.fields import JSONField from philo.utils import ContentTypeSubclassLimiter -from philo.validators import RedirectValidator +from philo.utils.entities import LazyPassthroughAttributeMapper from philo.signals import view_about_to_render, view_finished_rendering +__all__ = ('Node', 'View', 'MultiView', 'Redirect', 'File') + + _view_content_type_limiter = ContentTypeSubclassLimiter(None) +CACHE_PHILO_ROOT = getattr(settings, "PHILO_CACHE_PHILO_ROOT", True) -class Node(TreeEntity): +class Node(SlugTreeEntity): """ :class:`Node`\ s are the basic building blocks of a website using Philo. They define the URL hierarchy and connect each URL to a :class:`View` subclass instance which is used to generate an HttpResponse. """ - view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter) - view_object_id = models.PositiveIntegerField() + view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter, blank=True, null=True) + view_object_id = models.PositiveIntegerField(blank=True, null=True) #: :class:`GenericForeignKey` to a non-abstract subclass of :class:`View` view = generic.GenericForeignKey('view_content_type', 'view_object_id') @property def accepts_subpath(self): """A property shortcut for :attr:`self.view.accepts_subpath `""" - if self.view: - return self.view.accepts_subpath + if self.view_object_id and self.view_content_type_id: + return ContentType.objects.get_for_id(self.view_content_type_id).model_class().accepts_subpath return False def handles_subpath(self, subpath): - return self.view.handles_subpath(subpath) + if self.view_object_id and self.view_content_type_id: + return ContentType.objects.get_for_id(self.view_content_type_id).model_class().handles_subpath(subpath) + return False def render_to_response(self, request, extra_context=None): """This is a shortcut method for :meth:`View.render_to_response`""" - return self.view.render_to_response(request, extra_context) + if self.view_object_id and self.view_content_type_id: + view_model = ContentType.objects.get_for_id(self.view_content_type_id).model_class() + self.view = view_model._default_manager.select_related(depth=1).get(pk=self.view_object_id) + return self.view.render_to_response(request, extra_context) + raise Http404 def get_absolute_url(self, request=None, with_domain=False, secure=False): """ @@ -61,6 +74,8 @@ class Node(TreeEntity): Node urls will not contain a trailing slash unless a subpath is provided which ends with a trailing slash. Subpaths are expected to begin with a slash, as if returned by :func:`django.core.urlresolvers.reverse`. + Because this method will be called frequently and will always try to reverse ``philo-root``, the results of that reversal will be cached by default. This can be disabled by setting :setting:`PHILO_CACHE_PHILO_ROOT` to ``False``. + :meth:`construct_url` may raise the following exceptions: - :class:`NoReverseMatch` if "philo-root" is not reversable -- for example, if :mod:`philo.urls` is not included anywhere in your urlpatterns. @@ -75,7 +90,14 @@ class Node(TreeEntity): """ # Try reversing philo-root first, since we can't do anything if that fails. - root_url = reverse('philo-root') + if CACHE_PHILO_ROOT: + key = "CACHE_PHILO_ROOT__" + settings.ROOT_URLCONF + root_url = cache.get(key) + if root_url is None: + root_url = reverse('philo-root') + cache.set(key, root_url) + else: + root_url = reverse('philo-root') try: current_site = Site.objects.get_current() @@ -102,7 +124,7 @@ class Node(TreeEntity): return '%s%s%s%s' % (domain, root_url, path, subpath) - class Meta: + class Meta(SlugTreeEntity.Meta): app_label = 'philo' @@ -118,12 +140,13 @@ class View(Entity): #: A generic relation back to nodes. nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id') - #: Property or attribute which defines whether this :class:`View` can handle subpaths. Default: ``False`` + #: An attribute on the class which defines whether this :class:`View` can handle subpaths. Default: ``False`` accepts_subpath = False - def handles_subpath(self, subpath): - """Returns True if the the :class:`View` handles the given subpath, and False otherwise.""" - if not self.accepts_subpath and subpath != "/": + @classmethod + def handles_subpath(cls, subpath): + """Returns True if the :class:`View` handles the given subpath, and False otherwise.""" + if not cls.accepts_subpath and subpath != "/": return False return True @@ -133,17 +156,14 @@ class View(Entity): If ``obj`` is provided, :meth:`get_reverse_params` will be called and the results will be combined with any ``view_name``, ``args``, and ``kwargs`` that may have been passed in. - This method will raise the following exceptions: - - - :class:`~philo.exceptions.ViewDoesNotProvideSubpaths` if :attr:`accepts_subpath` is False. - - :class:`~philo.exceptions.ViewCanNotProvideSubpath` if a reversal is not possible. - :param view_name: The name of the view to be reversed. :param args: Extra args for reversing the view. :param kwargs: A dictionary of arguments for reversing the view. :param node: The node whose subpath this is. :param obj: An object to be passed to :meth:`get_reverse_params` to generate a view_name, args, and kwargs for reversal. :returns: A subpath beyond the node that reverses the view, or an absolute url that reverses the view if a node was passed in. + :except philo.exceptions.ViewDoesNotProvideSubpaths: if :attr:`accepts_subpath` is False + :except philo.exceptions.ViewCanNotProvideSubpath: if a reversal is not possible. """ if not self.accepts_subpath: @@ -174,10 +194,20 @@ class View(Entity): """ 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 attributes_with_node(self, node, mapper=LazyPassthroughAttributeMapper): + """ + Returns a :class:`LazyPassthroughAttributeMapper` which can be used to directly retrieve the values of :class:`Attribute`\ s related to the :class:`View`, falling back on the :class:`Attribute`\ s of the passed-in :class:`Node` and its ancestors. + + """ + return mapper((self, node)) def render_to_response(self, request, extra_context=None): + """ + Renders the :class:`View` as an :class:`HttpResponse`. This will raise :const:`~philo.exceptions.MIDDLEWARE_NOT_CONFIGURED` if the `request` doesn't have an attached :class:`Node`. This can happen if the :class:`~philo.middleware.RequestNodeMiddleware` is not in :setting:`settings.MIDDLEWARE_CLASSES` or if it is not functioning correctly. + + :meth:`render_to_response` will send the :data:`~philo.signals.view_about_to_render` signal, then call :meth:`actually_render_to_response`, and finally send the :data:`~philo.signals.view_finished_rendering` signal before returning the ``response``. + + """ if not hasattr(request, 'node'): raise MIDDLEWARE_NOT_CONFIGURED @@ -188,6 +218,7 @@ class View(Entity): return response def actually_render_to_response(self, request, extra_context=None): + """Concrete subclasses must override this method to provide the business logic for turning a ``request`` and ``extra_context`` into an :class:`HttpResponse`.""" raise NotImplementedError('View subclasses must implement actually_render_to_response.') class Meta: @@ -198,24 +229,25 @@ _view_content_type_limiter.cls = View class MultiView(View): + """ + :class:`MultiView` is an abstract model which represents a section of related pages - for example, a :class:`~philo.contrib.penfield.BlogView` might have a foreign key to :class:`Page`\ s for an index, an entry detail, an entry archive by day, and so on. :class:`!MultiView` subclasses :class:`View`, and defines the following additional methods and attributes: + + """ + #: Same as :attr:`View.accepts_subpath`. Default: ``True`` accepts_subpath = True @property def urlpatterns(self): + """Returns urlpatterns that point to views (generally methods on the class). :class:`MultiView`\ s can be thought of as "managing" these subpaths.""" raise NotImplementedError("MultiView subclasses must implement urlpatterns.") - 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): + """ + Resolves the remaining subpath left after finding this :class:`View`'s node using :attr:`self.urlpatterns ` and renders the view function (or method) found with the appropriate args and kwargs. + + """ clear_url_caches() - subpath = request.node.subpath + subpath = request.node._subpath 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): @@ -225,17 +257,33 @@ class MultiView(View): 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.""" + """Hook for providing instance-specific context - such as the value of a Field - to any view methods on the instance.""" return {} def basic_view(self, field_name): """ - Given the name of a field on ``self``, accesses the value of + Given the name of a field on the class, 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. + + :param field_name: The name of a field on the instance which contains a :class:`View` subclass instance. + :returns: A simple view function. + + Example:: + + class Foo(Multiview): + page = models.ForeignKey(Page) + + @property + def urlpatterns(self): + urlpatterns = patterns('', + url(r'^$', self.basic_view('page')) + ) + return urlpatterns + """ field = self._meta.get_field(field_name) view = getattr(self, field.name, None) @@ -254,8 +302,12 @@ class MultiView(View): class TargetURLModel(models.Model): + """An abstract parent class for models which deal in targeting a url.""" + #: An optional :class:`ForeignKey` to a :class:`.Node`. If provided, that node will be used as the basis for the redirect. target_node = models.ForeignKey(Node, blank=True, null=True, related_name="%(app_label)s_%(class)s_related") - 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.") + #: A :class:`CharField` which may contain an absolute or relative URL, or the name of a node's subpath. + url_or_subpath = models.CharField(max_length=200, blank=True, help_text="Point to this url or, if a node is defined and accepts subpaths, this subpath of the node.") + #: A :class:`~philo.models.fields.JSONField` instance. If the value of :attr:`reversing_parameters` is not None, the :attr:`url_or_subpath` will be treated as the name of a view to be reversed. The value of :attr:`reversing_parameters` will be passed into the reversal as args if it is a list or as kwargs if it is a dictionary. Otherwise it will be ignored. 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.") def clean(self): @@ -284,6 +336,7 @@ class TargetURLModel(models.Model): return self.url_or_subpath, args, kwargs def get_target_url(self): + """Calculates and returns the target url based on the :attr:`target_node`, :attr:`url_or_subpath`, and :attr:`reversing_parameters`.""" node = self.target_node if node is not None and node.accepts_subpath and self.url_or_subpath: if self.reversing_parameters is not None: @@ -308,13 +361,17 @@ class TargetURLModel(models.Model): class Redirect(TargetURLModel, View): + """Represents a 301 or 302 redirect to a different url on an absolute or relative path.""" + #: A choices tuple of redirect status codes (temporary or permanent). STATUS_CODES = ( (302, 'Temporary'), (301, 'Permanent'), ) + #: An :class:`IntegerField` which uses :attr:`STATUS_CODES` as its choices. Determines whether the redirect is considered temporary or permanent. status_code = models.IntegerField(choices=STATUS_CODES, default=302, verbose_name='redirect type') def actually_render_to_response(self, request, extra_context=None): + """Returns an :class:`HttpResponseRedirect` to :attr:`self.target_url`.""" response = HttpResponseRedirect(self.target_url) response.status_code = self.status_code return response @@ -324,23 +381,33 @@ class Redirect(TargetURLModel, View): class File(View): - """ For storing arbitrary files """ - - mimetype = models.CharField(max_length=255) + """Stores an arbitrary file.""" + #: The name of the uploaded file. This is meant for finding the file again later, not for display. + name = models.CharField(max_length=255) + #: Defines the mimetype of the uploaded file. This will not be validated. If no mimetype is provided, it will be automatically generated based on the filename. + mimetype = models.CharField(max_length=255, blank=True) + #: Contains the uploaded file. Files are uploaded to ``philo/files/%Y/%m/%d``. file = models.FileField(upload_to='philo/files/%Y/%m/%d') + def clean(self): + if not self.mimetype: + self.mimetype = mimetypes.guess_type(self.file.name, strict=False)[0] + if self.mimetype is None: + raise ValidationError("Unknown file type.") + 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 + response['Content-Disposition'] = "inline; filename=%s" % basename(self.file.name) return response class Meta: app_label = 'philo' def __unicode__(self): - return self.file.name + """Returns the value of :attr:`File.name`.""" + return self.name -register_templatetags('philo.templatetags.nodes') register_value_model(Node) \ No newline at end of file