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#!/usr/bin/env python
#
# Copyright (C) 2009 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This module is used for version 2 of the Google Data APIs.
import atom.core
XML_TEMPLATE = '{http://www.w3.org/XML/1998/namespace}%s'
ATOM_TEMPLATE = '{http://www.w3.org/2005/Atom}%s'
APP_TEMPLATE_V1 = '{http://purl.org/atom/app#}%s'
APP_TEMPLATE_V2 = '{http://www.w3.org/2007/app}%s'
class Name(atom.core.XmlElement):
"""The atom:name element."""
_qname = ATOM_TEMPLATE % 'name'
class Email(atom.core.XmlElement):
"""The atom:email element."""
_qname = ATOM_TEMPLATE % 'email'
class Uri(atom.core.XmlElement):
"""The atom:uri element."""
_qname = ATOM_TEMPLATE % 'uri'
class Person(atom.core.XmlElement):
"""A foundation class which atom:author and atom:contributor extend.
A person contains information like name, email address, and web page URI for
an author or contributor to an Atom feed.
"""
name = Name
email = Email
uri = Uri
class Author(Person):
"""The atom:author element.
An author is a required element in Feed unless each Entry contains an Author.
"""
_qname = ATOM_TEMPLATE % 'author'
class Contributor(Person):
"""The atom:contributor element."""
_qname = ATOM_TEMPLATE % 'contributor'
class Link(atom.core.XmlElement):
"""The atom:link element."""
_qname = ATOM_TEMPLATE % 'link'
href = 'href'
rel = 'rel'
type = 'type'
hreflang = 'hreflang'
title = 'title'
length = 'length'
class Generator(atom.core.XmlElement):
"""The atom:generator element."""
_qname = ATOM_TEMPLATE % 'generator'
uri = 'uri'
version = 'version'
class Text(atom.core.XmlElement):
"""A foundation class from which atom:title, summary, etc. extend.
This class should never be instantiated.
"""
type = 'type'
class Title(Text):
"""The atom:title element."""
_qname = ATOM_TEMPLATE % 'title'
class Subtitle(Text):
"""The atom:subtitle element."""
_qname = ATOM_TEMPLATE % 'subtitle'
class Rights(Text):
"""The atom:rights element."""
_qname = ATOM_TEMPLATE % 'rights'
class Summary(Text):
"""The atom:summary element."""
_qname = ATOM_TEMPLATE % 'summary'
class Content(Text):
"""The atom:content element."""
_qname = ATOM_TEMPLATE % 'content'
src = 'src'
class Category(atom.core.XmlElement):
"""The atom:category element."""
_qname = ATOM_TEMPLATE % 'category'
term = 'term'
scheme = 'scheme'
label = 'label'
class Id(atom.core.XmlElement):
"""The atom:id element."""
_qname = ATOM_TEMPLATE % 'id'
class Icon(atom.core.XmlElement):
"""The atom:icon element."""
_qname = ATOM_TEMPLATE % 'icon'
class Logo(atom.core.XmlElement):
"""The atom:logo element."""
_qname = ATOM_TEMPLATE % 'logo'
class Draft(atom.core.XmlElement):
"""The app:draft element which indicates if this entry should be public."""
_qname = (APP_TEMPLATE_V1 % 'draft', APP_TEMPLATE_V2 % 'draft')
class Control(atom.core.XmlElement):
"""The app:control element indicating restrictions on publication.
The APP control element may contain a draft element indicating whether or
not this entry should be publicly available.
"""
_qname = (APP_TEMPLATE_V1 % 'control', APP_TEMPLATE_V2 % 'control')
draft = Draft
class Date(atom.core.XmlElement):
"""A parent class for atom:updated, published, etc."""
class Updated(Date):
"""The atom:updated element."""
_qname = ATOM_TEMPLATE % 'updated'
class Published(Date):
"""The atom:published element."""
_qname = ATOM_TEMPLATE % 'published'
class LinkFinder(object):
"""An "interface" providing methods to find link elements
Entry elements often contain multiple links which differ in the rel
attribute or content type. Often, developers are interested in a specific
type of link so this class provides methods to find specific classes of
links.
This class is used as a mixin in Atom entries and feeds.
"""
def find_url(self, rel):
"""Returns the URL (as a string) in a link with the desired rel value."""
for link in self.link:
if link.rel == rel and link.href:
return link.href
return None
FindUrl = find_url
def get_link(self, rel):
"""Returns a link object which has the desired rel value.
If you are interested in the URL instead of the link object,
consider using find_url instead.
"""
for link in self.link:
if link.rel == rel and link.href:
return link
return None
GetLink = get_link
def find_self_link(self):
"""Find the first link with rel set to 'self'
Returns:
A str containing the link's href or None if none of the links had rel
equal to 'self'
"""
return self.find_url('self')
FindSelfLink = find_self_link
def get_self_link(self):
return self.get_link('self')
GetSelfLink = get_self_link
def find_edit_link(self):
return self.find_url('edit')
FindEditLink = find_edit_link
def get_edit_link(self):
return self.get_link('edit')
GetEditLink = get_edit_link
def find_edit_media_link(self):
link = self.find_url('edit-media')
# Search for media-edit as well since Picasa API used media-edit instead.
if link is None:
return self.find_url('media-edit')
return link
FindEditMediaLink = find_edit_media_link
def get_edit_media_link(self):
link = self.get_link('edit-media')
if link is None:
return self.get_link('media-edit')
return link
GetEditMediaLink = get_edit_media_link
def find_next_link(self):
return self.find_url('next')
FindNextLink = find_next_link
def get_next_link(self):
return self.get_link('next')
GetNextLink = get_next_link
def find_license_link(self):
return self.find_url('license')
FindLicenseLink = find_license_link
def get_license_link(self):
return self.get_link('license')
GetLicenseLink = get_license_link
def find_alternate_link(self):
return self.find_url('alternate')
FindAlternateLink = find_alternate_link
def get_alternate_link(self):
return self.get_link('alternate')
GetAlternateLink = get_alternate_link
class FeedEntryParent(atom.core.XmlElement, LinkFinder):
"""A super class for atom:feed and entry, contains shared attributes"""
author = [Author]
category = [Category]
contributor = [Contributor]
id = Id
link = [Link]
rights = Rights
title = Title
updated = Updated
def __init__(self, atom_id=None, text=None, *args, **kwargs):
if atom_id is not None:
self.id = atom_id
atom.core.XmlElement.__init__(self, text=text, *args, **kwargs)
class Source(FeedEntryParent):
"""The atom:source element."""
_qname = ATOM_TEMPLATE % 'source'
generator = Generator
icon = Icon
logo = Logo
subtitle = Subtitle
class Entry(FeedEntryParent):
"""The atom:entry element."""
_qname = ATOM_TEMPLATE % 'entry'
content = Content
published = Published
source = Source
summary = Summary
control = Control
class Feed(Source):
"""The atom:feed element which contains entries."""
_qname = ATOM_TEMPLATE % 'feed'
entry = [Entry]
class ExtensionElement(atom.core.XmlElement):
"""Provided for backwards compatibility to the v1 atom.ExtensionElement."""
def __init__(self, tag=None, namespace=None, attributes=None,
children=None, text=None, *args, **kwargs):
if namespace:
self._qname = '{%s}%s' % (namespace, tag)
else:
self._qname = tag
self.children = children or []
self.attributes = attributes or {}
self.text = text
_BecomeChildElement = atom.core.XmlElement._become_child