author | Sverre Rabbelier <srabbelier@gmail.com> |
Mon, 16 Mar 2009 23:54:07 +0000 | |
changeset 1905 | 8065fd1f3e4c |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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from datetime import datetime, timedelta |
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from django.core.exceptions import ImproperlyConfigured, ObjectDoesNotExist |
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from django.template import loader, Template, TemplateDoesNotExist |
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from django.contrib.sites.models import Site, RequestSite |
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from django.utils import feedgenerator |
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from django.utils.tzinfo import FixedOffset |
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from django.utils.encoding import smart_unicode, iri_to_uri |
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from django.conf import settings |
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from django.template import RequestContext |
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def add_domain(domain, url): |
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if not (url.startswith('http://') or url.startswith('https://')): |
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# 'url' must already be ASCII and URL-quoted, so no need for encoding |
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# conversions here. |
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url = iri_to_uri(u'http://%s%s' % (domain, url)) |
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return url |
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|
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class FeedDoesNotExist(ObjectDoesNotExist): |
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pass |
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|
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class Feed(object): |
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item_pubdate = None |
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item_enclosure_url = None |
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feed_type = feedgenerator.DefaultFeed |
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title_template = None |
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description_template = None |
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def __init__(self, slug, request): |
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self.slug = slug |
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self.request = request |
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self.feed_url = request.path |
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self.title_template_name = self.title_template or ('feeds/%s_title.html' % slug) |
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self.description_template_name = self.description_template or ('feeds/%s_description.html' % slug) |
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def item_link(self, item): |
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try: |
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return item.get_absolute_url() |
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except AttributeError: |
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raise ImproperlyConfigured, "Give your %s class a get_absolute_url() method, or define an item_link() method in your Feed class." % item.__class__.__name__ |
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def __get_dynamic_attr(self, attname, obj, default=None): |
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try: |
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attr = getattr(self, attname) |
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except AttributeError: |
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return default |
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if callable(attr): |
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# Check func_code.co_argcount rather than try/excepting the |
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# function and catching the TypeError, because something inside |
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# the function may raise the TypeError. This technique is more |
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# accurate. |
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if hasattr(attr, 'func_code'): |
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argcount = attr.func_code.co_argcount |
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else: |
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argcount = attr.__call__.func_code.co_argcount |
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if argcount == 2: # one argument is 'self' |
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return attr(obj) |
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else: |
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return attr() |
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return attr |
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def feed_extra_kwargs(self, obj): |
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""" |
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Returns an extra keyword arguments dictionary that is used when |
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initializing the feed generator. |
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""" |
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return {} |
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def item_extra_kwargs(self, item): |
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""" |
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Returns an extra keyword arguments dictionary that is used with |
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the `add_item` call of the feed generator. |
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""" |
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return {} |
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def get_object(self, bits): |
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return None |
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|
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def get_feed(self, url=None): |
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""" |
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Returns a feedgenerator.DefaultFeed object, fully populated, for |
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this feed. Raises FeedDoesNotExist for invalid parameters. |
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""" |
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if url: |
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bits = url.split('/') |
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else: |
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bits = [] |
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|
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try: |
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obj = self.get_object(bits) |
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except ObjectDoesNotExist: |
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raise FeedDoesNotExist |
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|
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if Site._meta.installed: |
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current_site = Site.objects.get_current() |
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96 |
else: |
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current_site = RequestSite(self.request) |
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|
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link = self.__get_dynamic_attr('link', obj) |
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link = add_domain(current_site.domain, link) |
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101 |
|
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feed = self.feed_type( |
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title = self.__get_dynamic_attr('title', obj), |
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subtitle = self.__get_dynamic_attr('subtitle', obj), |
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link = link, |
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description = self.__get_dynamic_attr('description', obj), |
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language = settings.LANGUAGE_CODE.decode(), |
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feed_url = add_domain(current_site.domain, |
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self.__get_dynamic_attr('feed_url', obj)), |
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author_name = self.__get_dynamic_attr('author_name', obj), |
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author_link = self.__get_dynamic_attr('author_link', obj), |
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author_email = self.__get_dynamic_attr('author_email', obj), |
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categories = self.__get_dynamic_attr('categories', obj), |
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114 |
feed_copyright = self.__get_dynamic_attr('feed_copyright', obj), |
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115 |
feed_guid = self.__get_dynamic_attr('feed_guid', obj), |
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116 |
ttl = self.__get_dynamic_attr('ttl', obj), |
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117 |
**self.feed_extra_kwargs(obj) |
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118 |
) |
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119 |
|
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120 |
try: |
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121 |
title_tmp = loader.get_template(self.title_template_name) |
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122 |
except TemplateDoesNotExist: |
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123 |
title_tmp = Template('{{ obj }}') |
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124 |
try: |
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125 |
description_tmp = loader.get_template(self.description_template_name) |
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126 |
except TemplateDoesNotExist: |
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127 |
description_tmp = Template('{{ obj }}') |
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128 |
|
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129 |
for item in self.__get_dynamic_attr('items', obj): |
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130 |
link = add_domain(current_site.domain, self.__get_dynamic_attr('item_link', item)) |
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131 |
enc = None |
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132 |
enc_url = self.__get_dynamic_attr('item_enclosure_url', item) |
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133 |
if enc_url: |
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134 |
enc = feedgenerator.Enclosure( |
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135 |
url = smart_unicode(enc_url), |
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136 |
length = smart_unicode(self.__get_dynamic_attr('item_enclosure_length', item)), |
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137 |
mime_type = smart_unicode(self.__get_dynamic_attr('item_enclosure_mime_type', item)) |
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|
138 |
) |
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139 |
author_name = self.__get_dynamic_attr('item_author_name', item) |
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140 |
if author_name is not None: |
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141 |
author_email = self.__get_dynamic_attr('item_author_email', item) |
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142 |
author_link = self.__get_dynamic_attr('item_author_link', item) |
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|
143 |
else: |
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144 |
author_email = author_link = None |
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|
145 |
|
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|
146 |
pubdate = self.__get_dynamic_attr('item_pubdate', item) |
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|
147 |
if pubdate: |
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|
148 |
now = datetime.now() |
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|
149 |
utcnow = datetime.utcnow() |
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|
150 |
|
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|
151 |
# Must always subtract smaller time from larger time here. |
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|
152 |
if utcnow > now: |
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|
153 |
sign = -1 |
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|
154 |
tzDifference = (utcnow - now) |
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|
155 |
else: |
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|
156 |
sign = 1 |
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|
157 |
tzDifference = (now - utcnow) |
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|
158 |
|
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|
159 |
# Round the timezone offset to the nearest half hour. |
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|
160 |
tzOffsetMinutes = sign * ((tzDifference.seconds / 60 + 15) / 30) * 30 |
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|
161 |
tzOffset = timedelta(minutes=tzOffsetMinutes) |
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|
162 |
pubdate = pubdate.replace(tzinfo=FixedOffset(tzOffset)) |
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|
163 |
|
54
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|
164 |
feed.add_item( |
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|
165 |
title = title_tmp.render(RequestContext(self.request, {'obj': item, 'site': current_site})), |
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|
166 |
link = link, |
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|
167 |
description = description_tmp.render(RequestContext(self.request, {'obj': item, 'site': current_site})), |
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|
168 |
unique_id = self.__get_dynamic_attr('item_guid', item, link), |
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|
169 |
enclosure = enc, |
323
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|
170 |
pubdate = pubdate, |
54
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|
171 |
author_name = author_name, |
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|
172 |
author_email = author_email, |
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|
173 |
author_link = author_link, |
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|
174 |
categories = self.__get_dynamic_attr('item_categories', item), |
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|
175 |
item_copyright = self.__get_dynamic_attr('item_copyright', item), |
323
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parents:
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diff
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|
176 |
**self.item_extra_kwargs(item) |
54
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|
177 |
) |
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|
178 |
return feed |