Implemented RSS 2.0 podcast feeds for course videos

feeds.py

@@ -40,6 +40,28 @@ def feed(handle=None):
 	course['updated'] = updated
 	return Response(render_template('feed.atom', course=course, entries=entries), 200, {'Content-Type': 'application/atom+xml'})
 
+@app.route('/<handle>/rssfeed')
+def rss_feed(handle):
+	course = query('SELECT * FROM courses WHERE handle = ? AND visible', handle)[0]
+	formats = query('''SELECT formats.* FROM formats
+			JOIN videos ON videos.video_format = formats.id
+			JOIN lectures ON lectures.id = videos.lecture_id
+			WHERE lectures.course_id = ?
+			GROUP BY formats.id
+			ORDER BY formats.player_prio DESC''', course['id'])
+	fmt = query('SELECT * FROM formats WHERE id = ?', request.values.get('format_id', formats[0]['id']))[0]
+	items = query('''SELECT lectures.*, "video" AS sep, videos.*
+			FROM lectures
+			JOIN courses ON courses.id = lectures.course_id
+			JOIN videos ON lectures.id = videos.lecture_id
+			WHERE courses.id = ? AND videos.video_format = ?AND courses.visible AND lectures.visible AND videos.visible
+			ORDER BY videos.time_created DESC
+			LIMIT 100''', course['id'], fmt['id'])
+	chapters = query('SELECT chapters.* FROM chapters JOIN lectures ON lectures.id = chapters.lecture_id WHERE lectures.course_id = ? AND NOT chapters.deleted AND chapters.visible ORDER BY time ASC', course['id'])
+	for item in items:
+		item['updated'] = max(item['video']['time_created'], item['video']['time_updated'], item['time_created'], item['time_updated'], key=fixdate)
+	return Response(render_template('feed.rss', course=course, format=fmt, formats=formats, items=items, chapters=chapters), 200, {'Content-Type': 'application/rss+xml; charset=UTF-8'})
+
 @app.route('/courses/feed')
 def courses_feed():
 	courses = query('SELECT * FROM courses WHERE visible AND listed ORDER BY time_created DESC LIMIT 100')

template_helper.py

 from server import *
 import subprocess
+from time import mktime
+from email.utils import formatdate
 
 app.jinja_env.trim_blocks = True
 app.jinja_env.lstrip_blocks = True
@@ -154,6 +156,10 @@ def human_time(d):
 def rfc3339(d):
 	return d.strftime('%Y-%m-%dT%H:%M:%S+02:00')
 
+@app.template_filter()
+def rfc822(d):
+	return formatdate(mktime(d.timetuple()))
+
 @app.template_global()
 def get_announcements(minlevel=0):
 	offset = timedelta()

templates/feed.rss

+{% macro title(fmt) %}
+{{ course.title }} ({{ fmt.description }}) — Video AG, FSMPI
+{%- endmacro %}
+<?xml version="1.0" encoding="UTF-8"?>
+<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:psc="http://podlove.org/simple-chapters" version="2.0">
+<channel>
+<title>{{ title(format) }}</title>
+<link>{{ url_for('course', handle=course.handle, _external=True) }}</link>
+<description><![CDATA[{{ course.description }}]]></description>
+<generator>Website der Video AG (+https://git.fsmpi.rwth-aachen.de/videoaginfra/website)</generator>
+<image>
+	<url>{{ url_for('static', filename='logo.png', _external=True) }}</url>
+	<title>{{ title(format) }}</title>
+	<link>{{ url_for('course', handle=course.handle, _external=True) }}</link>
+</image>
+<atom:link rel="self" type="application/rss+xml" title="{{ title(format) }}" href="{{ url_for('rss_feed', handle=course.handle, format_id=format.id, _external=True) }}"/>
+{% for fmt in formats %}
+{% if fmt.id != format.id %}
+<atom:link rel="alternate" type="application/rss+xml" title="{{ title(fmt) }}" href="{{ url_for('rss_feed', handle=course.handle, format_id=fmt.id, _external=True) }}"/>
+{% endif %}
+{% endfor %}
+{% for item in items %}
+<item>
+	<title>{{ item.title }}</title>
+	<link>{{ url_for('lecture', id=item.id, course=course.handle, _external=True) }}</link>
+	<pubDate>{{ item.updated|rfc822 }}</pubDate>
+	<guid>video.fsmpi.rwth-aachen.de:{{ item.video.id }}</guid>
+	<description><![CDATA[{{ item.comment|e }}]]></description>
+	<psc:chapters xmlns:psc="http://podlove.org/simple-chapters" version="1.2">
+		{% for chapter in chapters|selectattr('lecture_id','equalto',item.id) %}
+		<psc:chapter start="{{ chapter.time }}" title="{{ chapter.text }}"/>
+		{% endfor %}
+	</psc:chapters>
+	<enclosure url="{{ url_for('files', filename=item.video.path, _external=True) }}" length="{{ item.video.file_size }}" type="{{ format.mimetype }}"/>
+</item>
+{% endfor %}
+</channel>
+</rss>