-from django.db import models
-from django.contrib.contenttypes.models import ContentType
+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.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404
+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.template import add_to_builtins as register_templatetags
+from django.db import models
+from django.http import HttpResponse, HttpResponseServerError, HttpResponseRedirect, Http404
from django.utils.encoding import smart_str
-from inspect import getargspec
-from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED
-from philo.models.base import TreeEntity, Entity, QuerySetMapper, register_value_model
+
+from philo.exceptions import MIDDLEWARE_NOT_CONFIGURED, ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths
+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.exceptions import ViewCanNotProvideSubpath, ViewDoesNotProvideSubpaths, AncestorDoesNotExist
+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):
- view_content_type = models.ForeignKey(ContentType, related_name='node_view_set', limit_choices_to=_view_content_type_limiter)
- view_object_id = models.PositiveIntegerField()
+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, 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):
- if self.view:
- return self.view.accepts_subpath
+ """A property shortcut for :attr:`self.view.accepts_subpath <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):
- return self.view.render_to_response(request, extra_context)
+ """This is a shortcut method for :meth:`View.render_to_response`"""
+ 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):
+ """
+ This is essentially a shortcut for calling :meth:`construct_url` without a subpath.
+
+ :returns: The absolute url of the node on the current site.
+
+ """
return self.construct_url(request=request, with_domain=with_domain, secure=secure)
def construct_url(self, subpath="/", 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.
+ This method will do its best to construct a URL based on the Node's location. If with_domain is True, that URL will include a domain and a protocol; if secure is True as well, the protocol will be https. The request will be used to construct a domain in cases where a call to :meth:`Site.objects.get_current` fails.
+
+ 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.
+ - :class:`Site.DoesNotExist <ObjectDoesNotExist>` if with_domain is True but no :class:`Site` or :class:`RequestSite` can be built.
+ - :class:`~philo.exceptions.AncestorDoesNotExist` if the root node of the site isn't an ancestor of the node constructing the URL.
+
+ :param string subpath: The subpath to be constructed beyond beyond the node's URL.
+ :param request: :class:`HttpRequest` instance. Will be used to construct a :class:`RequestSite` if :meth:`Site.objects.get_current` fails.
+ :param with_domain: Whether the constructed URL should include a domain name and protocol.
+ :param secure: Whether the protocol, if included, should be http:// or https://.
+ :returns: A constructed url for accessing the given subpath of the current node instance.
+
"""
# 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()
return '%s%s%s%s' % (domain, root_url, path, subpath)
- class Meta:
+ class Meta(SlugTreeEntity.Meta):
app_label = 'philo'
class View(Entity):
+ """
+ :class:`View` is an abstract model that represents an item which can be "rendered", generally in response to an :class:`HttpRequest`.
+
+ """
+ #: A generic relation back to nodes.
nodes = generic.GenericRelation(Node, content_type_field='view_content_type', object_id_field='view_object_id')
+ #: An attribute on the class which defines whether this :class:`View` can handle subpaths. Default: ``False``
accepts_subpath = False
- def handles_subpath(self, subpath):
- 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
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 :attr:`accepts_subpath` is True, try to reverse a URL using the given parameters using ``self`` as the urlconf.
+
+ 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.
+
+ :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:
raise ViewDoesNotProvideSubpaths
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."""
+ """
+ This method is not implemented on the base class. It should return a (``view_name``, ``args``, ``kwargs``) tuple suitable for reversing a url for the given ``obj`` using ``self`` as the urlconf. If a reversal will not be possible, this method should raise :class:`~philo.exceptions.ViewCanNotProvideSubpath`.
+
+ """
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
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:
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 <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):
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)
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):
kwargs = dict([(smart_str(k, 'ascii'), v) for k, v in params.items()])
return self.url_or_subpath, args, kwargs
- def get_target_url(self):
+ def get_target_url(self, memoize=True):
+ """Calculates and returns the target url based on the :attr:`target_node`, :attr:`url_or_subpath`, and :attr:`reversing_parameters`. The results will be memoized by default; this can be prevented by passing in ``memoize=False``."""
+ if memoize:
+ memo_args = (self.target_node_id, self.url_or_subpath, self.reversing_parameters_json)
+ try:
+ return self._target_url_memo[memo_args]
+ except AttributeError:
+ self._target_url_memo = {}
+ except KeyError:
+ pass
+
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:
subpath = self.url_or_subpath
if subpath[0] != '/':
subpath = '/' + subpath
- return node.construct_url(subpath)
+ target_url = node.construct_url(subpath)
elif node is not None:
- return node.get_absolute_url()
+ target_url = node.get_absolute_url()
else:
if self.reversing_parameters is not None:
view_name, args, kwargs = self.get_reverse_params()
- return reverse(view_name, args=args, kwargs=kwargs)
- return self.url_or_subpath
+ target_url = reverse(view_name, args=args, kwargs=kwargs)
+ else:
+ target_url = self.url_or_subpath
+
+ if memoize:
+ self._target_url_memo[memo_args] = target_url
+ return target_url
target_url = property(get_target_url)
class Meta:
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
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
git.ithinksw.org / philo.git / blobdiff