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# -*-*- encoding: utf-8 -*-*-
#
# This is gdata.photos.media, implementing parts of the MediaRSS spec in gdata structures
#
# $Id: __init__.py 81 2007-10-03 14:41:42Z havard.gulldahl $
#
# Copyright 2007 Håvard Gulldahl
# Portions copyright 2007 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.
"""Essential attributes of photos in Google Photos/Picasa Web Albums are
expressed using elements from the `media' namespace, defined in the
MediaRSS specification[1].
Due to copyright issues, the elements herein are documented sparingly, please
consult with the Google Photos API Reference Guide[2], alternatively the
official MediaRSS specification[1] for details.
(If there is a version conflict between the two sources, stick to the
Google Photos API).
[1]: http://search.yahoo.com/mrss (version 1.1.1)
[2]: http://code.google.com/apis/picasaweb/reference.html#media_reference
Keep in mind that Google Photos only uses a subset of the MediaRSS elements
(and some of the attributes are trimmed down, too):
media:content
media:credit
media:description
media:group
media:keywords
media:thumbnail
media:title
"""
__author__ = u'havard@gulldahl.no'# (Håvard Gulldahl)' #BUG: api chokes on non-ascii chars in __author__
__license__ = 'Apache License v2'
import atom
import gdata
MEDIA_NAMESPACE = 'http://search.yahoo.com/mrss/'
YOUTUBE_NAMESPACE = 'http://gdata.youtube.com/schemas/2007'
class MediaBaseElement(atom.AtomBase):
"""Base class for elements in the MEDIA_NAMESPACE.
To add new elements, you only need to add the element tag name to self._tag
"""
_tag = ''
_namespace = MEDIA_NAMESPACE
_children = atom.AtomBase._children.copy()
_attributes = atom.AtomBase._attributes.copy()
def __init__(self, name=None, extension_elements=None,
extension_attributes=None, text=None):
self.name = name
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
class Content(MediaBaseElement):
"""(attribute container) This element describes the original content,
e.g. an image or a video. There may be multiple Content elements
in a media:Group.
For example, a video may have a
<media:content medium="image"> element that specifies a JPEG
representation of the video, and a <media:content medium="video">
element that specifies the URL of the video itself.
Attributes:
url: non-ambigous reference to online object
width: width of the object frame, in pixels
height: width of the object frame, in pixels
medium: one of `image' or `video', allowing the api user to quickly
determine the object's type
type: Internet media Type[1] (a.k.a. mime type) of the object -- a more
verbose way of determining the media type. To set the type member
in the contructor, use the content_type parameter.
(optional) fileSize: the size of the object, in bytes
[1]: http://en.wikipedia.org/wiki/Internet_media_type
"""
_tag = 'content'
_attributes = atom.AtomBase._attributes.copy()
_attributes['url'] = 'url'
_attributes['width'] = 'width'
_attributes['height'] = 'height'
_attributes['medium'] = 'medium'
_attributes['type'] = 'type'
_attributes['fileSize'] = 'fileSize'
def __init__(self, url=None, width=None, height=None,
medium=None, content_type=None, fileSize=None, format=None,
extension_elements=None, extension_attributes=None, text=None):
MediaBaseElement.__init__(self, extension_elements=extension_elements,
extension_attributes=extension_attributes,
text=text)
self.url = url
self.width = width
self.height = height
self.medium = medium
self.type = content_type
self.fileSize = fileSize
def ContentFromString(xml_string):
return atom.CreateClassFromXMLString(Content, xml_string)
class Credit(MediaBaseElement):
"""(string) Contains the nickname of the user who created the content,
e.g. `Liz Bennet'.
This is a user-specified value that should be used when referring to
the user by name.
Note that none of the attributes from the MediaRSS spec are supported.
"""
_tag = 'credit'
def CreditFromString(xml_string):
return atom.CreateClassFromXMLString(Credit, xml_string)
class Description(MediaBaseElement):
"""(string) A description of the media object.
Either plain unicode text, or entity-encoded html (look at the `type'
attribute).
E.g `A set of photographs I took while vacationing in Italy.'
For `api' projections, the description is in plain text;
for `base' projections, the description is in HTML.
Attributes:
type: either `text' or `html'. To set the type member in the contructor,
use the description_type parameter.
"""
_tag = 'description'
_attributes = atom.AtomBase._attributes.copy()
_attributes['type'] = 'type'
def __init__(self, description_type=None,
extension_elements=None, extension_attributes=None, text=None):
MediaBaseElement.__init__(self, extension_elements=extension_elements,
extension_attributes=extension_attributes,
text=text)
self.type = description_type
def DescriptionFromString(xml_string):
return atom.CreateClassFromXMLString(Description, xml_string)
class Keywords(MediaBaseElement):
"""(string) Lists the tags associated with the entry,
e.g `italy, vacation, sunset'.
Contains a comma-separated list of tags that have been added to the photo, or
all tags that have been added to photos in the album.
"""
_tag = 'keywords'
def KeywordsFromString(xml_string):
return atom.CreateClassFromXMLString(Keywords, xml_string)
class Thumbnail(MediaBaseElement):
"""(attributes) Contains the URL of a thumbnail of a photo or album cover.
There can be multiple <media:thumbnail> elements for a given <media:group>;
for example, a given item may have multiple thumbnails at different sizes.
Photos generally have two thumbnails at different sizes;
albums generally have one cropped thumbnail.
If the thumbsize parameter is set to the initial query, this element points
to thumbnails of the requested sizes; otherwise the thumbnails are the
default thumbnail size.
This element must not be confused with the <gphoto:thumbnail> element.
Attributes:
url: The URL of the thumbnail image.
height: The height of the thumbnail image, in pixels.
width: The width of the thumbnail image, in pixels.
"""
_tag = 'thumbnail'
_attributes = atom.AtomBase._attributes.copy()
_attributes['url'] = 'url'
_attributes['width'] = 'width'
_attributes['height'] = 'height'
def __init__(self, url=None, width=None, height=None,
extension_attributes=None, text=None, extension_elements=None):
MediaBaseElement.__init__(self, extension_elements=extension_elements,
extension_attributes=extension_attributes,
text=text)
self.url = url
self.width = width
self.height = height
def ThumbnailFromString(xml_string):
return atom.CreateClassFromXMLString(Thumbnail, xml_string)
class Title(MediaBaseElement):
"""(string) Contains the title of the entry's media content, in plain text.
Attributes:
type: Always set to plain. To set the type member in the constructor, use
the title_type parameter.
"""
_tag = 'title'
_attributes = atom.AtomBase._attributes.copy()
_attributes['type'] = 'type'
def __init__(self, title_type=None,
extension_attributes=None, text=None, extension_elements=None):
MediaBaseElement.__init__(self, extension_elements=extension_elements,
extension_attributes=extension_attributes,
text=text)
self.type = title_type
def TitleFromString(xml_string):
return atom.CreateClassFromXMLString(Title, xml_string)
class Player(MediaBaseElement):
"""(string) Contains the embeddable player URL for the entry's media content
if the media is a video.
Attributes:
url: Always set to plain
"""
_tag = 'player'
_attributes = atom.AtomBase._attributes.copy()
_attributes['url'] = 'url'
def __init__(self, player_url=None,
extension_attributes=None, extension_elements=None):
MediaBaseElement.__init__(self, extension_elements=extension_elements,
extension_attributes=extension_attributes)
self.url= player_url
class Private(atom.AtomBase):
"""The YouTube Private element"""
_tag = 'private'
_namespace = YOUTUBE_NAMESPACE
class Duration(atom.AtomBase):
"""The YouTube Duration element"""
_tag = 'duration'
_namespace = YOUTUBE_NAMESPACE
_attributes = atom.AtomBase._attributes.copy()
_attributes['seconds'] = 'seconds'
class Category(MediaBaseElement):
"""The mediagroup:category element"""
_tag = 'category'
_attributes = atom.AtomBase._attributes.copy()
_attributes['term'] = 'term'
_attributes['scheme'] = 'scheme'
_attributes['label'] = 'label'
def __init__(self, term=None, scheme=None, label=None, text=None,
extension_elements=None, extension_attributes=None):
"""Constructor for Category
Args:
term: str
scheme: str
label: str
text: str The text data in the this element
extension_elements: list A list of ExtensionElement instances
extension_attributes: dict A dictionary of attribute value string pairs
"""
self.term = term
self.scheme = scheme
self.label = label
self.text = text
self.extension_elements = extension_elements or []
self.extension_attributes = extension_attributes or {}
class Group(MediaBaseElement):
"""Container element for all media elements.
The <media:group> element can appear as a child of an album, photo or
video entry."""
_tag = 'group'
_children = atom.AtomBase._children.copy()
_children['{%s}content' % MEDIA_NAMESPACE] = ('content', [Content,])
_children['{%s}credit' % MEDIA_NAMESPACE] = ('credit', Credit)
_children['{%s}description' % MEDIA_NAMESPACE] = ('description', Description)
_children['{%s}keywords' % MEDIA_NAMESPACE] = ('keywords', Keywords)
_children['{%s}thumbnail' % MEDIA_NAMESPACE] = ('thumbnail', [Thumbnail,])
_children['{%s}title' % MEDIA_NAMESPACE] = ('title', Title)
_children['{%s}category' % MEDIA_NAMESPACE] = ('category', [Category,])
_children['{%s}duration' % YOUTUBE_NAMESPACE] = ('duration', Duration)
_children['{%s}private' % YOUTUBE_NAMESPACE] = ('private', Private)
_children['{%s}player' % MEDIA_NAMESPACE] = ('player', Player)
def __init__(self, content=None, credit=None, description=None, keywords=None,
thumbnail=None, title=None, duration=None, private=None,
category=None, player=None, extension_elements=None,
extension_attributes=None, text=None):
MediaBaseElement.__init__(self, extension_elements=extension_elements,
extension_attributes=extension_attributes,
text=text)
self.content=content
self.credit=credit
self.description=description
self.keywords=keywords
self.thumbnail=thumbnail or []
self.title=title
self.duration=duration
self.private=private
self.category=category or []
self.player=player
def GroupFromString(xml_string):
return atom.CreateClassFromXMLString(Group, xml_string)
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