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main.py
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main.py
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import requests
from lxml import html
from urllib.parse import urlsplit
import urllib
import re
import os
import json
import hashlib
import os.path
basefolder = "BlackBoard"
config_file = "config.json"
courses_files = {}
course_links_types = ("/webapps/blackboard/content/listContent.jsp", "/webapps/blackboard/execute/content/blankPage")
NEW=1
CHANGED=2
DOWNLOADED=3
def ensure_dir(d):
if not os.path.exists(d):
os.makedirs(d)
class BlackBoard:
def __init__(self, username, password):
self.session = requests.Session()
try:
with open("cache.json", "r") as f:
self.files = json.load(f)
except:
self.files = {}
self.courses = []
self.login(username, password)
def getRoot(self, url):
request = self.session.get(url)
return html.fromstring(request.text)
def postRoot(self, url, payload):
request = self.session.post(url, data=payload)
return html.fromstring(request.text)
def login(self, username, password):
print("Logging in")
root = self.getRoot("https://bb.au.dk/webapps/portal/execute/tabs/tabAction?tab_tab_group_id=_21_1")
link = root.xpath('//*[@id="module:_304_1"]/div[2]/div/div/p[2]/a/@href')[0]
request = self.session.get(link)
payload = {'username': username, 'password': password}
root = self.postRoot(request.url, payload)
payload = {root[1][1][2].get('name'): root[1][1][2].get('value')}
root = self.postRoot(root[1][1].get("action"), payload)
payload = {root[1][1][0].get('name'): root[1][1][0].get('value'), root[1][1][1].get('name'): root[1][1][1].get('value')}
root = self.postRoot(root[1][1].get("action"), payload)
print("\t" + username + " validated")
print("")
def getCourses(self):
print("Getting courses")
root = self.getRoot("https://bb.au.dk/webapps/portal/execute/tabs/tabAction?action=refreshAjaxModule&modId=_22_1&tabId=_2_1&tab_tab_group_id=_2_1")
course_titles = root.xpath("//div[1]/ul/li/a/text()")
course_urls = root.xpath("//div[1]/ul/li/a/@href")
course_ids = [re.search("&id=([^&]+)", url).group(1) for url in course_urls]
for id, title in zip(course_ids, course_titles):
print("\tFound: " + title)
self.courses.append({'id':id, 'title':title})
ensure_dir(basefolder + "\\" + title)
print("")
def getPageFolder(self, root):
print("Getting page")
#page_folder = self.files
folders = root.xpath('//*[@id="breadcrumbs"]/*[@role="navigation"]/ol/li/a/text()')
if len(root.xpath('//*[@id="breadcrumbs"]/*[@role="navigation"]/ol/li/text()')) > 0:
folders.append(root.xpath('//*[@id="breadcrumbs"]/*[@role="navigation"]/ol/li/text()')[-1])
folders = [x.strip() for x in folders]
folders = [re.sub('[^\w\[\]_\-\(\)\#\!\&\ ]*', '', x) for x in folders]
#for folder in folders:
# if folder not in page_folder:
# page_folder[folder] = {}
# page_folder = page_folder[folder]
print("\t" + ' -> '.join(folders))
return '\\'.join(folders)
def getFileinfo(self, url):
request = self.session.head(url, allow_redirects=True)
file = {}
id = self.sha256(request.url)
file['url'] = request.url
file['last-modified'] = request.headers.get('last-modified')
file['filename'] = urllib.parse.unquote(urlsplit(request.url).path.split("/")[-1])
file['status'] = NEW
return id, file
def parsePage(self, url):
#url = "https://bb.au.dk/webapps/blackboard/content/listContent.jsp?course_id=_33462_1&content_id=_194882_1&mode=reset"
root = self.getRoot(url)
folder = self.getPageFolder(root)
menu = root.xpath('//*[@id="courseMenuPalette_contents"]//li/a')
for link in menu:
url = link.get("href")
if url.startswith(course_links_types):
if url not in self.course_links:
self.course_links[url] = False
content = root.xpath('//*[@class="vtbegenerated"]//a')
for link in content:
url = link.get("href")
if url.startswith('/bbcswebdav/'):
(id, info) = self.getFileinfo("https://bb.au.dk" + url)
info['folder'] = folder
if id not in self.files:
self.files[id] = info
elif self.files[id]['last-modified'] != info['last-modified']:
self.files[id] = info
self.files[id]['status'] = CHANGED
print("\t\t[ " + str(self.files[id]['status']) + " ] " + self.files[id]['filename'])
elif url.startswith('https://blackboard.au.dk/bbcswebdav'):
(id, info) = self.getFileinfo(url)
info['folder'] = folder
if id not in self.files:
self.files[id] = info
elif self.files[id]['last-modified'] != info['last-modified']:
self.files[id] = info
self.files[id]['status'] = CHANGED
print("\t\t[ " + str(self.files[id]['status']) + " ] " + self.files[id]['filename'])
elif url.startswith(course_links_types):
if url not in self.course_links:
self.course_links[url] = False
content = root.xpath('//*[@id="content_listContainer"]//li//a')
for link in content:
url = link.get("href")
if url.startswith('/bbcswebdav/'):
(id, info) = self.getFileinfo("https://bb.au.dk" + url)
info['folder'] = folder
if id not in self.files:
self.files[id] = info
elif self.files[id]['last-modified'] != info['last-modified']:
self.files[id] = info
self.files[id]['status'] = CHANGED
print("\t\t[ " + str(self.files[id]['status']) + " ] " + self.files[id]['filename'])
elif url.startswith('https://blackboard.au.dk/bbcswebdav'):
(id, info) = self.getFileinfo(url)
info['folder'] = folder
if id not in self.files:
self.files[id] = info
elif self.files[id]['last-modified'] != info['last-modified']:
self.files[id] = info
self.files[id]['status'] = CHANGED
print("\t\t[ " + str(self.files[id]['status']) + " ] " + self.files[id]['filename'])
elif url.startswith(course_links_types):
if url not in self.course_links:
self.course_links[url] = False
return content
def sha256(self, string):
return hashlib.sha256(string.encode('utf-8')).hexdigest()
def parseCourse(self, id):
self.course_links = {}
self.course_links['/webapps/blackboard/execute/launcher?type=Course&url=&id=' + id] = False
missing = True
while missing:
missing = False
for url, visited in self.course_links.items():
if not visited:
missing = True
self.course_links[url] = True
self.parsePage("https://bb.au.dk" + url)
break
print("")
def downloadFiles(self):
print("Downloading files")
for id, file in self.files.items():
if file['status'] == NEW:
self.downloadFile(file)
if file['status'] == CHANGED:
self.downloadFile(file)
def downloadFile(self,file):
if file['filename'] == "":
return
ensure_dir(basefolder + "\\" + file['folder'])
print(file['folder'] + "\\" + file['filename'])
r = self.session.get(file['url'], stream=True)
with open(basefolder + "\\" + file['folder'] + "\\" + file['filename'], 'wb') as f:
for chunk in r.iter_content(chunk_size=1024):
if chunk: # filter out keep-alive new chunks
f.write(chunk)
f.flush()
file['status'] = DOWNLOADED
self.saveCache()
def saveCache(self):
with open("cache.json", "w") as f:
json.dump(self.files, f)
def getUserinfo():
try:
with open(config_file, "r") as f:
config = json.load(f)
except:
config = {}
config['username'] = input("Username: ")
config['password'] = input("Password: ")
with open(config_file, "w") as f:
json.dump(config, f)
return config
config = getUserinfo()
bb = BlackBoard(config['username'], config['password'])
bb.getCourses()
for course in bb.courses:
bb.parseCourse(course['id'])
bb.downloadFiles()