prog2.py

import sys
from mechanize import Browser
import base64
import subprocess
import glob

# Downloads the Videos for Prog2
def start(items) :
	user = items["user"]
	password = base64.b64decode(items["pass"])
	saveto = items["saveto"]
	br = Browser()
	br.open("https://prog2.cdl.uni-saarland.de/users/login")	
	br.select_form(nr=0)
	br["data[User][username]"] = user
	br["data[User][password]"] = password
	response = br.submit()
	p = br.open("https://prog2.cdl.uni-saarland.de/units")
	dummy = p.read()
	for link in br.links(url_regex = "/units/view") :
		page = br.follow_link(link)
		content = page.read()
		ids = []
		endindex = 0
		index = content.find("videoId: '",endindex)
		while index > -1 :
			endindex = content.find("'",index + 10)
			ids.append(content[index+10:endindex])
			index = content.find("videoId: '",endindex)
		for id in ids :
			downloadYoutube(id, saveto, False)

# Downloads YouTuve-Video with id to saveto and overwrites (or not)
def downloadYoutube(id, saveto = "", overwrite = True):
	output = "-o \"" + saveto + "%(title)s-%(id)s.%(ext)s\""
	if (overwrite or len(glob.glob(saveto + "*" + id + "*")) == 0) :
		url = "http://www.youtube.com/watch?v="+id
		subprocess.call("youtube-dl " + output + " \"" + url + " \"", shell=True)
	else :
		print("Video with id " + id + " already exists.")