server.py 17.9 KB
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from flask import Flask, g, request, url_for, redirect, session, render_template, flash, Response
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from werkzeug.routing import Rule
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from functools import wraps
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from datetime import date, timedelta, datetime, time, MINYEAR
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import threading
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import os
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import sys
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import hashlib
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import random
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import sched
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app = Flask(__name__)
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app.jinja_env.trim_blocks = True
app.jinja_env.lstrip_blocks = True
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app.add_template_global(random.randint, name='randint')
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app.add_template_global(datetime, name='datetime')
app.add_template_global(timedelta, name='timedelta')
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scheduler = sched.scheduler()
def run_scheduler():
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	import time
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	time.sleep(1) # UWSGI does weird things on startup
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	while True:
		scheduler.run()
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		time.sleep(10)
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def sched_func(delay, priority=0, firstdelay=None, args=[], kargs={}):
	if firstdelay == None:
		firstdelay = random.randint(1, 120)
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	def wrapper(func):
		def sched_wrapper():
			with app.test_request_context():
				func(*args, *kargs)
			scheduler.enter(delay, priority, sched_wrapper)
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		scheduler.enter(firstdelay, priority, sched_wrapper)
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		return func
	return wrapper

threading.Thread(target=run_scheduler, daemon=True).start()
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config = app.config
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config.from_pyfile('config.py.example', silent=True)
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if sys.argv[0].endswith('run.py'): 
	config['SQLITE_INIT_DATA'] = True
	config['DEBUG'] = True
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config.from_pyfile('config.py', silent=True)
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if config['DEBUG']:
	app.jinja_env.auto_reload = True
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if not config.get('SECRET_KEY', None):
	config['SECRET_KEY'] = os.urandom(24)
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from db import query, modify, searchquery, ldapauth, ldapget
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mod_endpoints = []
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@app.template_global()
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def ismod(*args):
	return ('user' in session)

def mod_required(func):
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	mod_endpoints.append(func.__name__)
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	@wraps(func)
	def decorator(*args, **kwargs):
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		if not ismod():
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			flash('Diese Funktion ist nur für Moderatoren verfügbar!')
			return redirect(url_for('login', ref=request.url))
		else:
			return func(*args, **kwargs)
	return decorator

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app.jinja_env.globals['navbar'] = []
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# iconlib can be 'bootstrap'
# ( see: http://getbootstrap.com/components/#glyphicons )
# or 'fa'
# ( see: http://fontawesome.io/icons/ )
def register_navbar(name, iconlib='bootstrap', icon=None):
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	def wrapper(func):
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		endpoint = func.__name__
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		app.jinja_env.globals['navbar'].append((endpoint, name, iconlib, icon, not endpoint in mod_endpoints))
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		return func
	return wrapper

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def render_endpoint(endpoint, flashtext=None, **kargs):
	if flashtext:
		flash(flashtext)
	# request.endpoint is used for navbar highlighting
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	request.url_rule = Rule(request.path, endpoint=endpoint)
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	return app.view_functions[endpoint](**kargs)

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def handle_errors(endpoint, text, code, *errors, **epargs):
	def wrapper(func):
		@wraps(func)
		def decorator(*args, **kwargs):
			try:
				return func(*args, **kwargs)
			except errors:
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				if endpoint:
					return render_endpoint(endpoint, text, **epargs), code
				else:
					return text, code
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		return decorator
	return wrapper

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@app.errorhandler(404)
def handle_not_found(e):
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	return render_endpoint('index', 'Diese Seite existiert nicht!'), 404
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@app.template_filter(name='semester')
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def human_semester(s, long=False):
	if not s or s == 'zeitlos' or len(s) != 6:
		return 'Zeitlos'
	year = s[0:4]
	semester = s[4:6].upper()
	if not year.isdigit() or semester not in ['SS', 'WS']:
		print('Invalid semester string "%s"'%s)
		return '??'
	if not long:
		return semester+year[2:]
	elif semester == 'SS':
		return 'Sommersemester %s'%year
	else:
		return 'Wintersemester %s/%s'%(year, str(int(year)+1)[2:])
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@app.template_filter(name='date')
def human_date(d):
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	return d.strftime('%d.%m.%Y')
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@app.template_filter(name='time')
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def human_time(d):
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	return d.strftime('%H:%M')

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@app.template_filter()
def rfc3339(d):
	return d.strftime('%Y-%m-%dT%H:%M:%S+02:00')

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@app.template_global()
def get_announcements(minlevel=0):
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	offset = timedelta()
	if ismod():
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		offset = timedelta(hours=24)
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	return query('SELECT * FROM announcements WHERE NOT deleted AND (time_expire ISNULL OR time_expire > ?) AND (? OR (visible AND time_publish < ?)) AND level >= ? ORDER BY level DESC', datetime.now()-offset, ismod(), datetime.now(), minlevel)
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@app.template_filter()
def fixnl(s):
	# To be remove, as soon as db schema is cleaned-up
	return str(s).replace('\n', '<br>')

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@app.route('/')
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@register_navbar('Home', icon='home')
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def index():
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	start = date.today() - timedelta(days=1)
	end = start + timedelta(days=7)
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	upcomming = query('''
		SELECT lectures.*, "course" AS sep, courses.*
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		FROM lectures
		JOIN courses ON (lectures.course_id = courses.id)
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		WHERE (time > ?) AND (time < ?) and lectures.visible and courses.visible and courses.listed
		ORDER BY time ASC LIMIT 30''',start,end)
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	for i in upcomming:
		i['date'] = i['time'].date()
	latestvideos=query('''
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		SELECT lectures.*, "course" AS sep, courses.*
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		FROM lectures
		LEFT JOIN videos ON (videos.lecture_id = lectures.id)
		LEFT JOIN courses on (courses.id = lectures.course_id)
		WHERE (? OR (courses.visible AND courses.listed AND lectures.visible AND videos.visible))
		GROUP BY videos.lecture_id
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		ORDER BY MAX(videos.time_updated) DESC
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		LIMIT 6	''',ismod())
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	featured = query('SELECT * FROM featured WHERE NOT deleted AND (? OR visible)', ismod())
	return render_template('index.html', latestvideos=latestvideos, upcomming=upcomming, featured=featured)
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@app.route('/course')
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@register_navbar('Videos', icon='film')
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def courses():
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	courses = query('SELECT * FROM courses WHERE (? OR (visible AND listed)) ORDER BY title', ismod())
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	for course in courses:
		if course['semester'] == '':
			course['semester'] = 'zeitlos'
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	groupedby = request.args.get('groupedby')
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	if groupedby not in ['title', 'semester', 'organizer']:
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		groupedby = 'semester'
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	return render_template('courses.html', courses=courses, groupedby=groupedby)
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@app.route('/course/<handle>')
@app.route('/course/<int:id>')
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@handle_errors('courses', 'Diese Veranstaltung existiert nicht!', 404, IndexError)
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def course(id=None, handle=None):
	if id:
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		course = query('SELECT * FROM courses WHERE id = ? AND (? OR visible)', id, ismod())[0]
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	else:
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		course = query('SELECT * FROM courses WHERE handle = ? AND (? OR visible)', handle, ismod())[0]
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	course['auth'] = query('SELECT * FROM auth WHERE course_id = ? ORDER BY auth_type', course['id'])
	auths = query('SELECT auth.* FROM auth JOIN lectures ON (auth.lecture_id = lectures.id) WHERE lectures.course_id = ? ORDER BY auth.auth_type', course['id'])
	lectures = query('SELECT * FROM lectures WHERE course_id = ? AND (? OR visible) ORDER BY time, duration DESC', course['id'], ismod())
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	for lecture in lectures:
		lecture['auth'] = []
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		lecture['course'] = course
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		for auth in auths:
			if auth['lecture_id'] == lecture['id']:
				lecture['auth'].append(auth)
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	videos = query('''
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			SELECT videos.*, (videos.downloadable AND courses.downloadable) as downloadable, formats.description AS format_description, formats.player_prio, formats.prio
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			FROM videos
			JOIN lectures ON (videos.lecture_id = lectures.id)
			JOIN formats ON (videos.video_format = formats.id)
			JOIN courses ON (lectures.course_id = courses.id)
			WHERE lectures.course_id= ? AND (? OR videos.visible)
			ORDER BY lectures.time, formats.prio DESC
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			''', course['id'], ismod())
	return render_template('course.html', course=course, lectures=lectures, videos=videos)
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@app.route('/faq')
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@register_navbar('FAQ', icon='question-sign')
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def faq():
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	return render_template('faq.html')
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@app.route('/play/<int:id>')
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@app.route('/embed/<int:id>', endpoint='embed')
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@handle_errors('course', 'Diese Vorlesung existiert nicht!', 404, IndexError)
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def lecture(id):
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	lecture = query('SELECT * FROM lectures WHERE id = ? AND (? OR visible)', id, ismod())[0]
	videos = query('''
			SELECT videos.*, (videos.downloadable AND courses.downloadable) as downloadable, formats.description AS format_description, formats.player_prio, formats.prio
			FROM videos
			JOIN lectures ON (videos.lecture_id = lectures.id)
			JOIN formats ON (videos.video_format = formats.id)
			JOIN courses ON (lectures.course_id = courses.id)
			WHERE lectures.course_id= ? AND (? OR videos.visible)
			ORDER BY lectures.time, formats.prio DESC
			''', lecture['course_id'], ismod())
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	if not videos:
		flash('Zu dieser Vorlesung wurden noch keine Videos veröffentlicht!')
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	course = query('SELECT * FROM courses WHERE id = ? AND (? OR (visible AND listed))', lecture['course_id'], ismod())
	if not course:
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		return render_endpoint('course', 'Diese Veranstaltung existiert nicht!'), 404
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	chapters = query('SELECT * FROM chapters WHERE lecture_id = ? AND NOT deleted AND (? OR visible) ORDER BY time ASC', id, ismod())
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	return render_template('embed.html' if request.endpoint == 'embed' else 'lecture.html', course=course, lecture=lecture, videos=videos, chapters=chapters)
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@app.route('/search')
def search():
	if 'q' not in request.args:
		return redirect(url_for('index'))
	q = request.args['q']
	courses = searchquery(q, '*', ['title', 'short', 'organizer', 'subject', 'description'],
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			'courses', 'WHERE (? OR (visible AND listed)) GROUP BY id ORDER BY _score DESC, semester DESC LIMIT 20', ismod())
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	lectures = searchquery(q, 'lectures.*, courses.visible AS coursevisible, courses.listed, "course" AS sep, courses.*',
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			['lectures.title', 'lectures.comment', 'lectures.speaker', 'courses.short'],
			'lectures LEFT JOIN courses on (courses.id = lectures.course_id)',
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			'WHERE (? OR (coursevisible AND listed AND visible)) GROUP BY id ORDER BY _score DESC, time DESC LIMIT 30', ismod())
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	return render_template('search.html', searchtext=request.args['q'], courses=courses, lectures=lectures)
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def check_mod(user, groups):
	return user and 'users' in groups

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@app.route('/login', methods=['GET', 'POST'])
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def login():
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	if request.method == 'GET':
		return render_template('login.html')
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	user, groups = ldapauth(request.form.get('user'), request.form.get('password'))
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	if not check_mod(user, groups):
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		flash('Login fehlgeschlagen!')
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		return render_template('login.html')
	session['user'] = ldapget(user)
	dbuser = query('SELECT * FROM users WHERE name = ?', user)
	if not dbuser:
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		modify('INSERT INTO users (name, realname, fsacc, level, calendar_key, rfc6238) VALUES (?, ?, ?, 1, "", "")', user, session['user']['givenName'], user)
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		dbuser = query('SELECT * FROM users WHERE name = ?', user)
	session['user']['dbid'] = dbuser[0]['id']
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	return redirect(request.values.get('ref', url_for('index')))
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@app.route('/logout', methods=['GET', 'POST'])
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def logout():
	session.pop('user')
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	return redirect(request.values.get('ref', url_for('index')))
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# name: (tablename, idcolumn, [editable_fields], [fields_to_set_at_creation_time])
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tabs = {
	'courses': ('courses_data', 'id', ['visible', 'listed', 'title', 'short',
			'handle', 'organizer', 'subject', 'semester', 'downloadable',
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			'internal', 'responsible','deleted','description'],
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			['created_by', 'time_created', 'time_updated']),
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	'lectures': ('lectures_data', 'id', ['visible', 'title', 'comment',
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			'internal', 'speaker', 'place', 'time', 'duration', 'jumplist','deleted'],
			['course_id', 'time_created', 'time_updated']),
	'videos': ('videos_data', 'id', ['visible','deleted'],
			['created_by', 'time_created', 'time_updated']),
	'chapters': ('chapters', 'id', ['time', 'text', 'visible', 'deleted'],
			['created_by', 'time_created', 'time_updated']),
	'announcements': ('announcements', 'id', ['text', 'level', 'visible',
			'deleted', 'time_publish', 'time_expire'],
			['created_by', 'time_created', 'time_updated']),
	'featured': ('featured', 'id', ['title', 'text', 'internal', 'visible', 'deleted'],
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			['created_by', 'time_created', 'time_updated']),
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	'auth': ('auth_data', 'auth_id', ['auth_type', 'auth_user', 'auth_passwd', 'deleted'],
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			['course_id', 'lecture_id', 'video_id', 'created_by', 'time_created', 'time_updated']),
	'sorterrorlog': ('sorterrorlog_data', 'id', ['deleted'],
			['time_created', 'time_updated'])
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}

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@app.route('/edit', methods=['GET', 'POST'])
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@mod_required
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def edit(prefix='', ignore=[]):
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	# All editable tables are expected to have a 'time_updated' field
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	ignore.append('ref')
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	ignore.append('prefix')
	if not prefix and 'prefix' in request.args:
		prefix = request.args['prefix']
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	modify('BEGIN')
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	changes = request.values.items()
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	if request.is_json:
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		changes = request.get_json().items()
	for key, val in changes:
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		if key in ignore:
			continue
		key = prefix+key
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		table, id, column = key.split('.', 2)
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		assert table in tabs
		assert column in tabs[table][2]
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		modify('INSERT INTO changelog (`table`,id_value, id_key, field, value_new, value_old, `when`, who, executed) VALUES (?,?,?,?,?,(SELECT %s FROM %s WHERE %s = ?),?,?,1)'%(column, tabs[table][0], tabs[table][1]),
				table, id, tabs[table][1], column, val, id, datetime.now(), session['user']['dbid'])
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		modify('UPDATE %s SET %s = ?, time_updated = ? WHERE %s = ?'%(tabs[table][0], column, tabs[table][1]), val, datetime.now(), id)
	modify('COMMIT')
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	if 'ref' in request.values:
		return redirect(request.values['ref'])
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	return "OK", 200
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@app.route('/new/<table>', methods=['GET', 'POST'])
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@mod_required
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def create(table):
	assert table in tabs
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	defaults = {'created_by': session['user']['dbid'], 'time_created': datetime.now(), 'time_updated': datetime.now()}
	columns = []
	values = []
	for column, val in defaults.items():
		if column in tabs[table][3]:
			columns.append(column)
			values.append(val)
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	args = request.values
	if request.is_json:
		args = request.get_json()
	for column, val in args.items():
		if column == 'ref':
			continue
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		assert column in tabs[table][2]+tabs[table][3]
		assert column not in defaults
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		columns.append(column)
		values.append(val)
	id = modify('INSERT INTO %s (%s) VALUES (%s)'%(tabs[table][0],
				','.join(columns), ','.join(['?']*len(values))), *values)
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	if 'ref' in request.values:
		return redirect(request.values['ref'])
	return str(id), 200

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@app.route('/auth')
def auth(): # For use with nginx auth_request
	if 'X-Original-Uri' not in request.headers:
		return 'Internal Server Error', 500
	url = request.headers['X-Original-Uri'].lstrip(config['VIDEOPREFIX'])
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	ip = request.headers.get('X-Real-IP', '')
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	if url.endswith('jpg'):
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		return "OK", 200
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	videos = query('''SELECT videos.path, videos.id, lectures.id AS lecture_id, courses.id AS course_id, auth.*
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      FROM videos
      JOIN lectures ON (videos.lecture_id = lectures.id)
      JOIN courses ON (lectures.course_id = courses.id)
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			LEFT JOIN auth ON (videos.id = auth.video_id OR lectures.id = auth.lecture_id OR courses.id = auth.course_id)
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      WHERE videos.path = ?
      AND (? OR (courses.visible AND lectures.visible AND videos.visible))
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			ORDER BY auth.video_id DESC, auth.lecture_id DESC, auth.course_id DESC''',
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			url, ismod())
	if not videos:
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		return "Not allowed", 403
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	allowed = False
	types = []
	auth = request.authorization
	for video in videos:
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		if videos[0] and ((videos[0]['video_id'] and not video['video_id']) \
				or (videos[0]['lecture_id'] and not video['lecture_id'])):
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			break
		types.append(video['auth_type'])
		if video['auth_type'] == 'public':
			allowed = True
			break
		elif video['auth_type'] == 'password':
			if auth and video['auth_user'] == auth.username and video['auth_passwd'] == auth.password:
				allowed = True
				break
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	if not types[0] or allowed or ismod() or \
			(auth and check_mod(*ldapauth(auth.username, auth.password))):
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		return 'OK', 200
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		modify('INSERT INTO log VALUES (?, "", ?, "video", ?, ?)', ip, datetime.now(), videos[0]['id'], url)
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	elif 'password' in types:
		return Response("Login required", 401, {'WWW-Authenticate': 'Basic realm="Login Required"'})
	return "Not allowed", 403
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@app.route('/stats')
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@register_navbar('Statistiken', icon='stats')
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@mod_required
def stats():
	return render_template('stats.html')
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@app.route('/changelog')
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@register_navbar('Changelog', icon='book')
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@mod_required
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def changelog():
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	changelog = query('SELECT * FROM changelog LEFT JOIN users ON (changelog.who = users.id) ORDER BY `when` DESC LIMIT 50')
	for entry in changelog:
		entry['path'] = '.'.join([entry['table'], entry['id_value'], entry['field']])
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	return render_template('changelog.html', changelog=changelog)
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@app.route('/files/<filename>')
def files(filename):
	return redirect(config['VIDEOPREFIX']+'/'+filename)

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@app.route('/newchapter/<int:lectureid>', methods=['POST', 'GET'])
def suggest_chapter(lectureid):
	time = request.values['time']
	text = request.values['text']
	assert(time and text)
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	try:
		x = datetime.strptime(time,'%H:%M:%S')
		time= timedelta(hours=x.hour,minutes=x.minute,seconds=x.second).total_seconds()
		time = int(time)
	except ValueError:
		flash('Falsches Zeitformat, "%H:%M:%S" wird erwartet. Z.B. "01:39:42" für eine Kapitel bei Stunde 1, Minute 39, Sekunde 42')
		
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	submitter = None
	if not ismod():
		submitter = request.environ['REMOTE_ADDR']
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	id = modify('INSERT INTO chapters (lecture_id, time, text, time_created, time_updated, created_by, submitted_by) VALUES (?, ?, ?, ?, ?, ?, ?)',
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				lectureid, time, text, datetime.now(), datetime.now(), session.get('user', {'dbid':None})['dbid'], submitter)
	if 'ref' in request.values:
		return redirect(request.values['ref'])
	return 'OK',  200

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@app.route('/chapters/<int:lectureid>')
def chapters(lectureid):
	chapters = query("SELECT * FROM chapters WHERE lecture_id = ? and visible ORDER BY time DESC", lectureid)
	last = None
	for c in chapters:
		c['start'] = c['time']
		c['end'] = last['start'] if last else 9999
		last = c
	return Response(render_template('chapters.srt',chapters=chapters), 200, {'Content-Type':'text/vtt'})

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@app.route('/sitemap.xml')
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def sitemap():
	pages=[]
	# static pages
	for rule in app.url_map.iter_rules():
		if 'GET' in rule.methods and len(rule.arguments)==0:
			if rule.endpoint not in mod_endpoints:
				pages.append([rule.rule])
	for i in query('select * from courses where visible and listed'):
		pages.append([url_for('course',handle=i['handle'])])
		for j in query('select * from lectures where (course_id = ? and visible)',i['id']):
			pages.append([url_for('lecture',id=j['id'])])


	return Response(render_template('sitemap.xml', pages=pages), 200, {'Content-Type': 'application/atom+xml'} )

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import feeds
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import importer
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import timetable
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import sorter
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if 'ICAL_URL' in config:
	import meetings