243 lines
9.2 KiB
Python
243 lines
9.2 KiB
Python
# -*- coding: utf-8 -*-
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'''
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feedgen.ext.podcast_entry
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~~~~~~~~~~~~~~~~~~~~~~~~~
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Extends the feedgen to produce podcasts.
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:copyright: 2013, Lars Kiesow <lkiesow@uos.de>
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:license: FreeBSD and LGPL, see license.* for more details.
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'''
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from lxml import etree
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from feedgen.ext.base import BaseEntryExtension
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class PodcastEntryExtension(BaseEntryExtension):
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'''FeedEntry extension for podcasts.
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'''
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def __init__(self):
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## ITunes tags
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# http://www.apple.com/itunes/podcasts/specs.html#rss
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self.__itunes_author = None
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self.__itunes_block = None
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self.__itunes_image = None
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self.__itunes_duration = None
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self.__itunes_explicit = None
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self.__itunes_is_closed_captioned = None
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self.__itunes_order = None
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self.__itunes_subtitle = None
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self.__itunes_summary = None
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def extend_rss(self, entry):
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'''Add additional fields to an RSS item.
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:param feed: The RSS item XML element to use.
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'''
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ITUNES_NS = 'http://www.itunes.com/dtds/podcast-1.0.dtd'
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if self.__itunes_author:
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author = etree.SubElement(entry, '{%s}author' % ITUNES_NS)
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author.text = self.__itunes_author
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if not self.__itunes_block is None:
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block = etree.SubElement(entry, '{%s}block' % ITUNES_NS)
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block.text = 'yes' if self.__itunes_block else 'no'
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if self.__itunes_image:
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image = etree.SubElement(entry, '{%s}image' % ITUNES_NS)
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image.text = self.__itunes_image
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if self.__itunes_duration:
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duration = etree.SubElement(entry, '{%s}duration' % ITUNES_NS)
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duration.text = self.__itunes_duration
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if self.__itunes_explicit in ('yes', 'no', 'clean'):
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explicit = etree.SubElement(entry, '{%s}explicit' % ITUNES_NS)
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explicit.text = self.__itunes_explicit
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if not self.__itunes_is_closed_captioned is None:
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is_closed_captioned = etree.SubElement(entry, '{%s}isClosedCaptioned' % ITUNES_NS)
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is_closed_captioned.text = 'yes' if self.__itunes_is_closed_captioned else 'no'
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if not self.__itunes_order is None and self.__itunes_order >= 0:
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order = etree.SubElement(entry, '{%s}order' % ITUNES_NS)
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order.text = str(self.__itunes_order)
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if self.__itunes_subtitle:
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subtitle = etree.SubElement(entry, '{%s}subtitle' % ITUNES_NS)
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subtitle.text = self.__itunes_subtitle
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if self.__itunes_summary:
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summary = etree.SubElement(entry, '{%s}summary' % ITUNES_NS)
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summary.text = self.__itunes_summary
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return entry
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def itunes_author(self, itunes_author=None):
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'''Get or set the itunes:author of the podcast episode. The content of
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this tag is shown in the Artist column in iTunes. If the tag is not
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present, iTunes uses the contents of the <author> tag. If <itunes:author>
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is not present at the feed level, iTunes will use the contents of
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<managingEditor>.
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:param itunes_author: The author of the podcast.
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:returns: The author of the podcast.
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'''
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if not itunes_author is None:
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self.__itunes_author = itunes_author
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return self.__itunes_author
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def itunes_block(self, itunes_block=None):
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'''Get or set the ITunes block attribute. Use this to prevent episodes
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from appearing in the iTunes podcast directory.
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:param itunes_block: Block podcast episodes.
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:returns: If the podcast episode is blocked.
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'''
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if not itunes_block is None:
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self.__itunes_block = itunes_block
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return self.__itunes_block
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def itunes_image(self, itunes_image=None):
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'''Get or set the image for the podcast episode. This tag specifies the
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artwork for your podcast. Put the URL to the image in the href attribute.
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iTunes prefers square .jpg images that are at least 1400x1400 pixels,
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which is different from what is specified for the standard RSS image tag.
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In order for a podcast to be eligible for an iTunes Store feature, the
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accompanying image must be at least 1400x1400 pixels.
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iTunes supports images in JPEG and PNG formats with an RGB color space
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(CMYK is not supported). The URL must end in ".jpg" or ".png". If the
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<itunes:image> tag is not present, iTunes will use the contents of the
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RSS image tag.
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If you change your podcast’s image, also change the file’s name. iTunes
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may not change the image if it checks your feed and the image URL is the
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same. The server hosting your cover art image must allow HTTP head
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requests for iTS to be able to automatically update your cover art.
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:param itunes_image: Image of the podcast.
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:returns: Image of the podcast.
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'''
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if not itunes_image is None:
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if not ( itunes_image.endswith('.jpg') or itunes_image.endswith('.png') ):
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ValueError('Image file must be png or jpg')
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self.__itunes_image = itunes_image
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return self.__itunes_image
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def itunes_duration(self, itunes_duration=None):
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'''Get or set the duration of the podcast episode. The content of this
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tag is shown in the Time column in iTunes.
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The tag can be formatted HH:MM:SS, H:MM:SS, MM:SS, or M:SS (H = hours,
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M = minutes, S = seconds). If an integer is provided (no colon present),
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the value is assumed to be in seconds. If one colon is present, the
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number to the left is assumed to be minutes, and the number to the right
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is assumed to be seconds. If more than two colons are present, the
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numbers farthest to the right are ignored.
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:param itunes_duration: Duration of the podcast episode.
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:returns: Duration of the podcast episode.
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'''
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if not itunes_duration is None:
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itunes_duration = str(itunes_duration)
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if len(itunes_duration.split(':')) > 3 or \
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itunes_duration.lstrip('0123456789:') != '':
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ValueError('Invalid duration format')
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self.__itunes_duration = itunes_duration
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return self.itunes_duration
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def itunes_explicit(self, itunes_explicit=None):
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'''Get or the the itunes:explicit value of the podcast episode. This tag
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should be used to indicate whether your podcast episode contains explicit
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material. The three values for this tag are "yes", "no", and "clean".
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If you populate this tag with "yes", an "explicit" parental advisory
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graphic will appear next to your podcast artwork on the iTunes Store and
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in the Name column in iTunes. If the value is "clean", the parental
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advisory type is considered Clean, meaning that no explicit language or
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adult content is included anywhere in the episodes, and a "clean" graphic
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will appear. If the explicit tag is present and has any other value
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(e.g., "no"), you see no indicator — blank is the default advisory type.
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:param itunes_explicit: If the podcast episode contains explicit material.
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:returns: If the podcast episode contains explicit material.
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'''
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if not itunes_explicit is None:
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if not itunes_explicit in ('', 'yes', 'no', 'clean'):
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raise ValueError('Invalid value for explicit tag')
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self.__itunes_explicit = itunes_explicit
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return self.__itunes_explicit
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def itunes_is_closed_captioned(self, itunes_is_closed_captioned=None):
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'''Get or set the is_closed_captioned value of the podcast episode. This
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tag should be used if your podcast includes a video episode with embedded
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closed captioning support. The two values for this tag are "yes" and
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"no”.
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:param is_closed_captioned: If the episode has closed captioning support.
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:returns: If the episode has closed captioning support.
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'''
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if not itunes_is_closed_captioned is None:
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self.__itunes_is_closed_captioned = itunes_is_closed_captioned in ('yes', True)
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return self.__itunes_is_closed_captioned
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def itunes_order(self, itunes_order=None):
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'''Get or set the itunes:order value of the podcast episode. This tag can
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be used to override the default ordering of episodes on the store.
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This tag is used at an <item> level by populating with the number value
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in which you would like the episode to appear on the store. For example,
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if you would like an <item> to appear as the first episode in the
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podcast, you would populate the <itunes:order> tag with “1”. If
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conflicting order values are present in multiple episodes, the store will
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use default ordering (pubDate).
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To remove the order from the episode set the order to a value below zero.
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:param itunes_order: The order of the episode.
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:returns: The order of the episode.
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'''
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if not itunes_order is None:
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self.__itunes_order = int(itunes_order)
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return self.__itunes_order
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def itunes_subtitle(self, itunes_subtitle=None):
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'''Get or set the itunes:subtitle value for the podcast episode. The
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contents of this tag are shown in the Description column in iTunes. The
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subtitle displays best if it is only a few words long.
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:param itunes_subtitle: Subtitle of the podcast episode.
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:returns: Subtitle of the podcast episode.
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'''
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if not itunes_subtitle is None:
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self.__itunes_subtitle = itunes_subtitle
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return self.__itunes_subtitle
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def itunes_summary(self, itunes_summary=None):
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'''Get or set the itunes:summary value for the podcast episode. The
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contents of this tag are shown in a separate window that appears when the
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"circled i" in the Description column is clicked. It also appears on the
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iTunes page for your podcast. This field can be up to 4000 characters. If
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<itunes:summary> is not included, the contents of the <description> tag
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are used.
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:param itunes_summary: Summary of the podcast episode.
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:returns: Summary of the podcast episode.
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'''
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if not itunes_summary is None:
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self.__itunes_summary = itunes_summary
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return self.__itunes_summary
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