#!/bin/env python # -*- coding: utf-8 -*- ''' feedgenerator.podcast ~~~~~~~~~~~~~~~~~~~~~ Extends the feedgenerator to produce podcasts. :copyright: 2013, Lars Kiesow :license: FreeBSD and LGPL, see LICENSE for more details. ''' from lxml import etree from datetime import datetime import dateutil.parser import dateutil.tz from feedgenerator.feed import FeedGenerator from feedgenerator.util import ensure_format class PodcastGenerator(FeedGenerator): ## ITunes tags # http://www.apple.com/itunes/podcasts/specs.html#rss __itunes_author = None __itunes_block = None __itunes_category = None __itunes_image = None __itunes_explicit = None __itunes_complete = None __itunes_new_feed_url = None def __create_podcast(self): '''Create an RSS feed xml structure containing all previously set fields. :returns: Tuple containing the feed root element and the element tree. ''' rss_feed, _ = super(PodcastGenerator,self)._create_rss() # Replace the root element to add the itunes namespace ITUNES_NS = 'http://www.itunes.com/dtds/podcast-1.0.dtd' feed = etree.Element('rss', version='2.0', nsmap={ 'atom' :'http://www.w3.org/2005/Atom', 'itunes':ITUNES_NS} ) feed[:] = rss_feed[:] channel = feed[0] doc = etree.ElementTree(feed) if self.__itunes_author: author = etree.SubElement(channel, '{%s}author' % ITUNES_NS) author.text = self.__itunes_author if not self.__itunes_block is None: block = etree.SubElement(channel, '{%s}block' % ITUNES_NS) block.text = 'yes' if self.__itunes_block else 'no' if self.__itunes_category: category = etree.SubElement(channel, '{%s}category' % ITUNES_NS) category.attrib['text'] = self.__itunes_category['cat'] if self.__itunes_category.get('sub'): subcategory = etree.SubElement(category, '{%s}category' % ITUNES_NS) subcategory.attrib['text'] = self.__itunes_category['sub'] if self.__itunes_explicit in ('yes', 'no', 'clean'): explicit = etree.SubElement(channel, '{%s}explicit' % ITUNES_NS) explicit.text = self.__itunes_explicit if self.__itunes_complete in ('yes', 'no'): complete = etree.SubElement(channel, '{%s}complete' % ITUNES_NS) complete.text = self.__itunes_complete if self.__itunes_new_feed_url: new_feed_url = etree.SubElement(channel, '{%s}new-feed-url' % ITUNES_NS) new_feed_url.text = self.__itunes_new_feed_url return feed, doc def podcast_str(self, pretty=False): '''Generates an RSS feed and returns the feed XML as string. :param pretty: If the feed should be split into multiple lines and properly indented. :returns: String representation of the RSS feed. ''' feed, doc = self.__create_podcast() return etree.tostring(feed, pretty_print=pretty) def podcast_file(self, filename): '''Generates an RSS feed and write the resulting XML to a file. :param filename: Name of file to write. ''' feed, doc = self.__create_podcast() with open(filename, 'w') as f: doc.write(f) def itunes_author(self, itunes_author=None): '''Get or set the itunes:author. The content of this tag is shown in the Artist column in iTunes. If the tag is not present, iTunes uses the contents of the tag. If is not present at the feed level, iTunes will use the contents of . :param itunes_author: The author of the podcast. :returns: The author of the podcast. ''' if not itunes_author is None: self.__itunes_author = itunes_author return self.__itunes_author def itunes_block(self, itunes_block=None): '''Get or set the ITunes block attribute. Use this to prevent the entire podcast from appearing in the iTunes podcast directory. :param itunes_block: Block the podcast. :returns: If the podcast is blocked. ''' if not itunes_block is None: self.__itunes_block = itunes_block return self.__itunes_block def itunes_category(self, itunes_category=None, itunes_subcategory=None): '''Get or set the ITunes category which appears in the category column and in iTunes Store Browser. The (sub-)category has to be one from the values defined at http://www.apple.com/itunes/podcasts/specs.html#categories :param itunes_category: Category of the podcast. :param itunes_subcategory: Subcategory of the podcast. :returns: Category data of the podcast. ''' if not itunes_category is None: if not itunes_category in self._itunes_categories.keys(): raise ValueError('Invalid category') cat = {'cat':itunes_category} if not itunes_subcategory is None: if not itunes_subcategory in self._itunes_categories[itunes_category]: raise ValueError('Invalid subcategory') cat['sub'] = itunes_subcategory self.__itunes_category = cat return self.__itunes_category def itunes_image(self, itunes_image=None): '''Get or set the image for the podcast. This tag specifies the artwork for your podcast. Put the URL to the image in the href attribute. iTunes prefers square .jpg images that are at least 1400x1400 pixels, which is different from what is specified for the standard RSS image tag. In order for a podcast to be eligible for an iTunes Store feature, the accompanying image must be at least 1400x1400 pixels. iTunes supports images in JPEG and PNG formats with an RGB color space (CMYK is not supported). The URL must end in ".jpg" or ".png". If the tag is not present, iTunes will use the contents of the RSS image tag. If you change your podcast’s image, also change the file’s name. iTunes may not change the image if it checks your feed and the image URL is the same. The server hosting your cover art image must allow HTTP head requests for iTS to be able to automatically update your cover art. :param itunes_image: Image of the podcast. :returns: Image of the podcast. ''' if not itunes_image is None: if not ( itunes_image.endswith('.jpg') or itunes_image.endswith('.png') ): ValueError('Image file must be png or jpg') self.__itunes_image = itunes_image return self.__itunes_image def itunes_explicit(self, itunes_explicit=None): '''Get or the the itunes:explicit value of the podcast. This tag should be used to indicate whether your podcast contains explicit material. The three values for this tag are "yes", "no", and "clean". If you populate this tag with "yes", an "explicit" parental advisory graphic will appear next to your podcast artwork on the iTunes Store and in the Name column in iTunes. If the value is "clean", the parental advisory type is considered Clean, meaning that no explicit language or adult content is included anywhere in the episodes, and a "clean" graphic will appear. If the explicit tag is present and has any other value (e.g., "no"), you see no indicator — blank is the default advisory type. :param itunes_explicit: If the podcast contains explicit material. :returns: If the podcast contains explicit material. ''' if not itunes_explicit is None: if not itunes_explicit in ('', 'yes', 'no', 'clean'): raise ValueError('Invalid value for explicit tag') self.__itunes_explicit = itunes_explicit return self.__itunes_explicit def itunes_complete(self, itunes_complete=None): '''Get or set the itunes:complete value of the podcast. This tag can be used to indicate the completion of a podcast. If you populate this tag with "yes", you are indicating that no more episodes will be added to the podcast. If the tag is present and has any other value (e.g. “no”), it will have no effect on the podcast. :param itunes_complete: If the podcast is complete. :returns: If the podcast is complete. ''' if not itunes_complete is None: if not itunes_complete in ('yes', 'no', '', True, False): raise ValueError('Invalid value for complete tag') if itunes_complete == True: itunes_complete = 'yes' if itunes_complete == False: itunes_complete = 'no' self.__itunes_complete = itunes_complete return self.__itunes_complete def itunes_new_feed_url(self, itunes_new_feed_url=None): '''Get or set the new-feed-url property of the podcast. This tag allows you to change the URL where the podcast feed is located After adding the tag to your old feed, you should maintain the old feed for 48 hours before retiring it. At that point, iTunes will have updated the directory with the new feed URL. :param itunes_new_feed_url: New feed URL. :returns: New feed URL. ''' if not itunes_new_feed_url is None: self.__itunes_new_feed_url = itunes_new_feed_url return self.__itunes_new_feed_url _itunes_categories = { 'Arts': [ 'Design', 'Fashion & Beauty', 'Food', 'Literature', 'Performing Arts', 'Visual Arts' ], 'Business' : [ 'Business News', 'Careers', 'Investing', 'Management & Marketing', 'Shopping' ], 'Comedy' : [], 'Education' : [ 'Education', 'Education Technology', 'Higher Education', 'K-12', 'Language Courses', 'Training' ], 'Games & Hobbies' : [ 'Automotive', 'Aviation', 'Hobbies', 'Other Games', 'Video Games' ], 'Government & Organizations' : [ 'Local', 'National', 'Non-Profit', 'Regional' ], 'Health' : [ 'Alternative Health', 'Fitness & Nutrition', 'Self-Help', 'Sexuality' ], 'Kids & Family' : [], 'Music' : [], 'News & Politics' : [], 'Religion & Spirituality' : [ 'Buddhism', 'Christianity', 'Hinduism', 'Islam', 'Judaism', 'Other', 'Spirituality' ], 'Science & Medicine' : [ 'Medicine', 'Natural Sciences', 'Social Sciences' ], 'Society & Culture' : [ 'History', 'Personal Journals', 'Philosophy', 'Places & Travel' ], 'Sports & Recreation' : [ 'Amateur', 'College & High School', 'Outdoor', 'Professional' ], 'Technology' : [ 'Gadgets', 'Tech News', 'Podcasting', 'Software How-To' ], 'TV & Film' : [] }