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# -*- coding: utf-8 -*-

"""Django page CMS ``models``."""

import mptt

 

from datetime import datetime

from django.db import models

from django.contrib.auth.models import User

from django.utils.translation import ugettext_lazy as _

from django.utils.safestring import mark_safe

from django.core.cache import cache

from django.core.urlresolvers import reverse

from django.contrib.sites.models import Site

 

from pages.utils import get_placeholders, normalize_url

from pages.managers import PageManager, ContentManager

from pages.managers import PagePermissionManager, PageAliasManager

from pages import settings

 

class Page(models.Model):

    """

    This model contain the status, dates, author, template.

    The real content of the page can be found in the

    :class:`Content <pages.models.Content>` model.

 

    .. attribute:: creation_date

    When the page has been created.

 

    .. attribute:: publication_date

    When the page should be visible.

 

    .. attribute:: publication_end_date

    When the publication of this page end.

 

    .. attribute:: last_modification_date

    Last time this page has been modified.

 

    .. attribute:: status

    The current status of the page. Could be DRAFT, PUBLISHED,

    EXPIRED or HIDDEN. You should the property :attr:`calculated_status` if

    you want that the dates are taken in account.

 

    .. attribute:: template

    A string containing the name of the template file for this page.

    """

 

    # some class constants to refer to, e.g. Page.DRAFT

    DRAFT = 0

    PUBLISHED = 1

    EXPIRED = 2

    HIDDEN = 3

    STATUSES = (

        (PUBLISHED, _('Published')),

        (HIDDEN, _('Hidden')),

        (DRAFT, _('Draft')),

    )

 

    PAGE_LANGUAGES_KEY = "page_%d_languages"

    PAGE_URL_KEY = "page_%d_language_%s_url"

    #PAGE_TEMPLATE_KEY = "page_%d_template"

    #PAGE_CHILDREN_KEY = "page_children_%d_%d"

    PAGE_CONTENT_DICT_KEY = "page_content_dict_%d_%s_%d"

    PAGE_BROKEN_LINK_KEY = "page_broken_link_%s"

 

    author = models.ForeignKey(User, verbose_name=_('author'))

 

    parent = models.ForeignKey('self', null=True, blank=True,

            related_name='children', verbose_name=_('parent'))

    creation_date = models.DateTimeField(_('creation date'), editable=False,

            default=datetime.now)

    publication_date = models.DateTimeField(_('publication date'),

            null=True, blank=True, help_text=_('''When the page should go

            live. Status must be "Published" for page to go live.'''))

    publication_end_date = models.DateTimeField(_('publication end date'),

            null=True, blank=True, help_text=_('''When to expire the page.

            Leave empty to never expire.'''))

 

    last_modification_date = models.DateTimeField(_('last modification date'))

 

    status = models.IntegerField(_('status'), choices=STATUSES, default=DRAFT)

    template = models.CharField(_('template'), max_length=100, null=True,

            blank=True)

 

    delegate_to = models.CharField(_('template'), max_length=100, null=True,

            blank=True)

 

    freeze_date = models.DateTimeField(_('freeze date'),

            null=True, blank=True, help_text=_('''Don't publish any content

            after this date.'''))

 

    # Disable could make site tests fail

    sites = models.ManyToManyField(Site, default=[settings.SITE_ID],

            help_text=_('The site(s) the page is accessible at.'),

            verbose_name=_('sites'))

    redirect_to_url = models.CharField(max_length=200, null=True, blank=True)

 

    redirect_to = models.ForeignKey('self', null=True, blank=True,

            related_name='redirected_pages')

 

    # Managers

    objects = PageManager()

 

    if settings.PAGE_TAGGING:

        from tagging import fields

        tags = fields.TagField(null=True)

 

    class Meta:

        """Make sure the default page ordering is correct."""

        ordering = ['tree_id', 'lft']

        verbose_name = _('page')

        verbose_name_plural = _('pages')

 

    def save(self, *args, **kwargs):

        """Override the default ``save`` method."""

        if not self.status:

            self.status = self.DRAFT

        # Published pages should always have a publication date

        if self.publication_date is None and self.status == self.PUBLISHED:

            self.publication_date = datetime.now()

        # Drafts should not, unless they have been set to the future

        if self.status == self.DRAFT:

            if settings.PAGE_SHOW_START_DATE:

                if (self.publication_date and

                        self.publication_date <= datetime.now()):

                    self.publication_date = None

            else:

                self.publication_date = None

        self.last_modification_date = datetime.now()

        # let's assume there is no more broken links after a save

        cache.delete(self.PAGE_BROKEN_LINK_KEY % self.id)

        super(Page, self).save(*args, **kwargs)

 

    def _get_calculated_status(self):

        """Get the calculated status of the page based on

        :attr:`Page.publication_date`,

        :attr:`Page.publication_end_date`,

        and :attr:`Page.status`."""

        if settings.PAGE_SHOW_START_DATE and self.publication_date:

            if self.publication_date > datetime.now():

                return self.DRAFT

 

        if settings.PAGE_SHOW_END_DATE and self.publication_end_date:

            if self.publication_end_date < datetime.now():

                return self.EXPIRED

 

        return self.status

    calculated_status = property(_get_calculated_status)

 

    def get_children_for_frontend(self):

        """Return a :class:`QuerySet` of published children page"""

        return Page.objects.filter_published(self.get_children())

 

    def invalidate(self):

        """Invalidate cached data for this page."""

 

        cache.delete(self.PAGE_LANGUAGES_KEY % (self.id))

        #cache.delete(self.PAGE_TEMPLATE_KEY % (self.id))

 

        p_names = [p.name for p in get_placeholders(self.get_template())]

        if 'slug' not in p_names:

            p_names.append('slug')

        if 'title' not in p_names:

            p_names.append('title')

        #frozen = int(bool(self.freeze_date))

        # delete content cache, frozen or not

        for name in p_names:

            cache.delete(self.PAGE_CONTENT_DICT_KEY %

                (self.id, name, 1))

            cache.delete(self.PAGE_CONTENT_DICT_KEY %

                (self.id, name, 0))

 

        for lang in settings.PAGE_LANGUAGES:

            cache.delete(self.PAGE_URL_KEY % (self.id, lang[0]))

        cache.delete(self.PAGE_URL_KEY % (self.id, "None"))

 

 

    def get_languages(self):

        """

        Return a list of all used languages for this page.

        """

        languages = cache.get(self.PAGE_LANGUAGES_KEY % (self.id))

        if languages:

            return languages

 

        languages = [c['language'] for

                            c in Content.objects.filter(page=self,

                            type="slug").values('language')]

        languages = list(set(languages)) # remove duplicates

        languages.sort()

        cache.set(self.PAGE_LANGUAGES_KEY % (self.id), languages)

        return languages

 

    def is_first_root(self):

        """Return ``True`` if the page is the first root page."""

        if self.parent:

            return False

        return Page.objects.root()[0].id == self.id

 

    def get_url_path(self, language=None):

        """Return the URL's path component. Add the language prefix if

        ``PAGE_USE_LANGUAGE_PREFIX`` setting is set to ``True``.

 

        :param language: the wanted url language.

        """

        url = reverse('pages-root')

        if settings.PAGE_USE_LANGUAGE_PREFIX:

            url += str(language) + '/'

        return url + self.get_complete_slug(language)

 

    def get_absolute_url(self, language=None):

        """Alias for `get_url_path`.

 

        This method is only there for backward compatibility and will be

        removed in a near futur.

 

        :param language: the wanted url language.

        """

        return self.get_url_path(self, language=language)

 

    def get_complete_slug(self, language=None):

        """Return the complete slug of this page by concatenating

        all parent's slugs.

 

        :param language: the wanted slug language."""

        url = cache.get(self.PAGE_URL_KEY % (self.id, language))

        if url:

            return url

        if settings.PAGE_HIDE_ROOT_SLUG and self.is_first_root():

            url = ''

        else:

            url = u'%s' % self.slug(language)

        for ancestor in self.get_ancestors(ascending=True):

            url = ancestor.slug(language) + u'/' + url

 

        cache.set(self.PAGE_URL_KEY % (self.id, language), url)

 

        return url

 

    def get_url(self, language=None):

        """Alias for `get_complete_slug`.

 

        This method is only there for backward compatibility and will be

        removed in a near futur.

 

        :param language: the wanted url language.

        """

        return self.get_complete_slug(self, language=language)

 

    def slug(self, language=None, fallback=True):

        """

        Return the slug of the page depending on the given language.

 

        :param language: wanted language, if not defined default is used.

        :param fallback: if ``True``, the slug will also be searched in other \

        languages.

        """

 

        slug = Content.objects.get_content(self, language, 'slug',

                                           language_fallback=fallback)

 

        return slug

 

    def title(self, language=None, fallback=True):

        """

        Return the title of the page depending on the given language.

 

        :param language: wanted language, if not defined default is used.

        :param fallback: if ``True``, the slug will also be searched in other \

        languages.

        """

        if not language:

            language = settings.PAGE_DEFAULT_LANGUAGE

 

        return Content.objects.get_content(self, language, 'title',

                                           language_fallback=fallback)

 

    def get_template(self):

        """

        Get the :attr:`template <Page.template>` of this page if

        defined or the closer parent's one if defined

        or :attr:`pages.settings.DEFAULT_PAGE_TEMPLATE` otherwise.

        """

        if self.template:

            return self.template

 

        template = None

        for p in self.get_ancestors(ascending=True):

            if p.template:

                template = p.template

                break

 

        if not template:

            template = settings.DEFAULT_PAGE_TEMPLATE

 

        return template

 

    def get_template_name(self):

        """

        Get the template name of this page if defined or if a closer

        parent has a defined template or

        :data:`pages.settings.DEFAULT_PAGE_TEMPLATE` otherwise.

        """

        template = self.get_template()

        page_templates = settings.get_page_templates()

        for t in page_templates:

            if t[0] == template:

                return t[1]

        return template

 

    def has_page_permission(self, request):

        """

        Return ``True`` if the current user has permission on the page.

        Return the string 'All' if the user has all rights.

        """

        if not settings.PAGE_PERMISSION:

            return True

        else:

            permission = PagePermission.objects.get_page_id_list(request.user)

            if permission == "All":

                return True

            if self.id in permission:

                return True

            return False

 

    def has_broken_link(self):

        """

        Return ``True`` if the page have broken links to other pages

        into the content.

        """

        return cache.get(self.PAGE_BROKEN_LINK_KEY % self.id)

 

    def valid_targets(self, perms="All"):

        """Return a :class:`QuerySet` of valid targets for moving a page

        into the tree.

 

        :param perms: the level of permission of the concerned user.

        """

        exclude_list = [self.id]

        for p in self.get_descendants():

            exclude_list.append(p.id)

        if perms != "All":

            return Page.objects.filter(id__in=perms).exclude(

                                                id__in=exclude_list)

        else:

            return Page.objects.exclude(id__in=exclude_list)

 

    def slug_with_level(self, language=None):

        """Display the slug of the page prepended with insecable

        spaces equal to the level of page in the hierarchy."""

        level = ''

        if self.level:

            for n in range(0, self.level):

                level += '&nbsp;&nbsp;&nbsp;'

        return mark_safe(level + self.slug(language))

 

    def margin_level(self):

        return self.level * 2

 

    def __unicode__(self):

        if self.id:

            slug = self.slug()

        else:

            return "Page %s" % self.id

        return slug

 

# Don't register the Page model twice.

try:

    mptt.register(Page)

except mptt.AlreadyRegistered:

    pass

 

if settings.PAGE_PERMISSION:

    class PagePermission(models.Model):

        """

        :class:`Page <pages.models.Page>` permission object

        """

        TYPES = (

            (0, _('All')),

            (1, _('This page only')),

            (2, _('This page and all children')),

        )

        page = models.ForeignKey(Page, null=True, blank=True,

                verbose_name=_('page'))

        user = models.ForeignKey(User, verbose_name=_('user'))

        type = models.IntegerField(_('type'), choices=TYPES, default=0)

 

        objects = PagePermissionManager()

 

        class Meta:

            verbose_name = _('page permission')

            verbose_name_plural = _('page permissions')

 

        def __unicode__(self):

            return "%s :: %s" % (self.user,

                    unicode(PagePermission.TYPES[self.type][1]))

 

 

class Content(models.Model):

    """A block of content, tied to a :class:`Page <pages.models.Page>`,

    for a particular language"""

 

    # languages could have five characters : Brazilian Portuguese is pt-br

    language = models.CharField(_('language'), max_length=5, blank=False)

    body = models.TextField(_('body'))

    type = models.CharField(_('type'), max_length=100, blank=False)

    page = models.ForeignKey(Page, verbose_name=_('page'))

 

    creation_date = models.DateTimeField(_('creation date'), editable=False,

            default=datetime.now)

    objects = ContentManager()

 

    class Meta:

        get_latest_by = 'creation_date'

        verbose_name = _('content')

        verbose_name_plural = _('contents')

 

    def __unicode__(self):

        return "%s :: %s" % (self.page.slug(), self.body[0:15])

 

 

class PageAlias(models.Model):

    """URL alias for a :class:`Page <pages.models.Page>`"""

    page = models.ForeignKey(Page, null=True, blank=True,

        verbose_name=_('page'))

    url = models.CharField(max_length=255, unique=True)

    objects = PageAliasManager()

    class Meta:

        verbose_name_plural = _('Aliases')

 

    def save(self, *args, **kwargs):

        # normalize url

        self.url = normalize_url(self.url)

        super(PageAlias, self).save(*args, **kwargs)

 

    def __unicode__(self):

        return "%s => %s" % (self.url, self.page.get_complete_slug())