server.py 12.6 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
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import threading
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import os
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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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def timer_func():
	with app.test_request_context():
		pass # do something
	timer = threading.Timer(60*60, timer_func)
	timer.start()

timer = threading.Timer(0, timer_func)
timer.daemon = True
timer.start()

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config = app.config
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config['DB_SCHEMA'] = 'db_schema.sql'
config['DB_DATA'] = 'db_example.sql'
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config['DB_ENGINE'] = 'sqlite'
config['SQLITE_DB'] = 'db.sqlite'
config['SQLITE_INIT_SCHEMA'] = True
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config['SQLITE_INIT_DATA'] = False
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config['DEBUG'] = False
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config['VIDEOPREFIX'] = 'https://videoag.fsmpi.rwth-aachen.de'
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if __name__ == '__main__':
	config['SQLITE_INIT_DATA'] = True
	config['DEBUG'] = True
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config.from_pyfile('config.py', silent=True)
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from db import query, 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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def register_navbar(name, icon=None):
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	def wrapper(func):
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		endpoint = func.__name__
		app.jinja_env.globals['navbar'].append((endpoint, name, 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:
				return render_endpoint(endpoint, text, **epargs), code
		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.route('/')
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@register_navbar('Home', icon='home')
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def index():
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	return render_template('index.html', latestvideos=query('''
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				SELECT lectures.*, max(videos.time_updated) AS lastvidtime, courses.short, courses.downloadable, courses.title AS coursetitle
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				FROM lectures
				LEFT JOIN videos ON (videos.lecture_id = lectures.id)
				LEFT JOIN courses on (courses.id = lectures.course_id)
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				WHERE (? OR (courses.visible AND courses.listed AND lectures.visible AND videos.visible))
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				GROUP BY videos.lecture_id
				ORDER BY lastvidtime DESC
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				LIMIT 6
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			''', ismod()))
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@app.route('/course')
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@register_navbar('Videos', icon='film')
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def course():
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	courses = query('SELECT * FROM courses WHERE (? OR (visible AND listed))', ismod())
	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('course.html', courses=courses, groupedby=groupedby)
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@app.route('/course/<id>')
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@app.route('/course/<int:numid>')
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@handle_errors('course', 'Diese Veranstaltung existiert nicht!', 404, IndexError)
def course_id(numid=None, id=None):
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	if numid:
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		courses = query('SELECT * FROM courses WHERE id = ? AND (? OR visible)', numid, ismod())[0]
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	else:
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		courses = query('SELECT * FROM courses WHERE handle = ? AND (? OR visible)', id, ismod())[0]
	lectures = query('SELECT * FROM lectures WHERE course_id = ? AND (? OR visible)', courses['id'], ismod())
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	videos = query('''
			SELECT videos.*, (videos.downloadable AND courses.downloadable) as downloadable, formats.description AS format_description
			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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			''', courses['id'], ismod())
	return render_template('course_id.html', course=courses, 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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@handle_errors('course', 'Diese Vorlesung existiert nicht!', 404, IndexError)
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def play(id):
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	lectures = query('SELECT * FROM lectures WHERE id = ? AND (? OR visible)', id, ismod())
	videos = query('SELECT * FROM videos WHERE lecture_id = ? AND (? OR visible)', id, ismod())
	if not videos:
		flash('Zu dieser Vorlesung wurden noch keine Videos veröffentlicht!')
	courses = query('SELECT * FROM courses WHERE id = ? AND (? OR (visible AND listed))', lectures[0]['course_id'], ismod())
	if not courses:
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		return render_endpoint('course', 'Diese Veranstaltung existiert nicht!'), 404
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	return render_template('play.html', course=courses[0], lecture=lectures[0], videos=videos)
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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, courses.short, courses.downloadable, courses.title AS coursetitle',
			['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:
		query('INSERT INTO users (name, realname, fsacc, level, calendar_key, rfc6238) VALUES (?, ?, ?, 1, "", "")', user, session['user']['givenName'], user)
		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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@app.route('/edit', methods=['GET', 'POST'])
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@mod_required
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def edit():
	tabs = {
		'courses': ('courses_data', 'id', ['visible', 'listed', 'title', 'short',
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				'handle', 'organizer', 'subject', 'semester', 'downloadable',
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				'internal', 'responsible','deleted']),
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		'lectures': ('lectures_data', 'id', ['visible', 'title', 'comment',
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				'internal', 'speaker', 'place', 'time', 'duration', 'jumplist','deleted']),
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		'site_texts': ('site_texts', 'key', ['value']),
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		'videos': ('videos_data', 'id', ['visible','deleted'])
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	}
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	query('BEGIN')
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	if request.is_json:
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		changes = request.get_json().items()
	else:
		changes = request.args.items()
	for key, val in changes:
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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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		query('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']['givenName'])
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		query('UPDATE %s SET %s = ? WHERE %s = ?'%(tabs[table][0], column,tabs[table][1]), val, id)
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	query('COMMIT')
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	return "OK", 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
		query('INSERT INTO log VALUES (?, "", ?, "video", ?, ?)', ip, datetime.now(), videos[0]['id'], url)
	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('/schedule')
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@register_navbar('Drehplan', 'calendar')
@mod_required
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def schedule():
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	if 'kw' not in request.args:
		kw=0
	else:
		kw=int(request.args['kw'])
	start = date.today() - timedelta(days=date.today().weekday() -7*kw)
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	days = [{'date': start, 'lectures': [], 'atonce':0, 'index': 0 }]
	earlieststart=time(23,59)
	latestend=time(0,0)
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	for i in range(1,7):
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		days.append({'date': days[i-1]['date'] + timedelta(days=1), 'atonce':0, 'index': i, 'lectures':[] })
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	for i in days:
		# date and times are burning in sqlite
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		s = datetime.combine(i['date'],time())
		e = datetime.combine(i['date'],time(23,59))
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		i['lectures'] = query ('''
					SELECT lectures.*,courses.short
					FROM lectures 
					JOIN courses ON (lectures.course_id = courses.id) 
					WHERE (time < ?) AND (time > ?) 
					ORDER BY time ASC'''
				,e,s);
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		# sweepline to find out how many lectures overlap
		maxcol=0;
		curcol=0;
		freecol=[];
		for l in i['lectures']:
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			# who the hell inserts lectures with zero length?!?!?
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			l['time_end'] = l['time']+timedelta(minutes=max(l['duration'],1))
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		for l in sorted([(l['time'],True,l) for l in i['lectures']] + [(l['time_end'],False,l) for l in i['lectures']],key=lambda t:(t[0],t[1])):
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			if l[1]:
				curcol += 1
				if curcol > maxcol:
					maxcol = curcol
				if len(freecol) == 0:
					freecol.append(maxcol)
				l[2]['schedule_col'] = freecol.pop()
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				if earlieststart > l[0].time():
					earlieststart = l[0].time()
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			else:
				curcol -= 1
				freecol.append(l[2]['schedule_col'])
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				if latestend < l[0].time():
					latestend = l[0].time()
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		i['maxcol'] = max(maxcol,1)
	times=[]
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	s = min(earlieststart,time(8,0))
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	e = max(latestend,time(19,0))
	for i in range(s.hour*4,min(int((60*e.hour/15)/4)*4+5,24*4)):
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		t = i*15
		times.append(time(int(t/60),t%60))
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	return render_template('schedule.html',days=days,times=times,kw=kw)
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@app.route('/stats')
@register_navbar('Statistiken', 'stats')
@mod_required
def stats():
	return render_template('stats.html')
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@app.route('/log')
@register_navbar('Changelog', 'book')
@mod_required
def log():
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	changelog = query('SELECT *, ( "table" || "." || id_value || "." ||field) as path FROM changelog LEFT JOIN users ON (changelog.who = users.id) ORDER BY "when" DESC LIMIT 50')
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	return render_template('log.html', changelog=changelog)
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@app.route('/import/<source>/<id>')
@app.route('/import/<source>/<int:numid>')
@handle_errors('course', 'Diese Veranstaltung existiert nicht!', 404, IndexError)
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@mod_required
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def import_from(numid=None, source=None, id=None):
	if source != "campus":
		return "Unknown source", 404
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	if numid:
		courses = query('SELECT * FROM courses WHERE id = ?', numid)[0]
	else:
		courses = query('SELECT * FROM courses WHERE handle = ?', id)[0]
	lectures = query('SELECT * FROM lectures WHERE course_id = ?', courses['id'])
	return render_template('import_campus.html', course=courses, lectures=lectures)