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scrape_autolab.py
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scrape_autolab.py
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import requests
from bs4 import BeautifulSoup
from slugify import slugify
import re
import os
class makedirs_cd:
"""Context manager for changing the current working directory"""
def __init__(self, newPath):
self.newPath = os.path.expanduser(newPath)
def __enter__(self):
self.savedPath = os.getcwd()
os.makedirs(self.newPath, exist_ok=True)
os.chdir(self.newPath)
def __exit__(self, etype, value, traceback):
os.chdir(self.savedPath)
# BEGIN
# replace this section with information from autolab network request
cookies = {
'browser.timezone': 'America/Los_Angeles',
'_autolab3_session': '_autolab3_session_value',
'_session_id': '_session_id_value',
}
headers = {
'Connection': 'keep-alive',
'Cache-Control': 'max-age=0',
'Upgrade-Insecure-Requests': '1',
'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'Sec-Fetch-Site': 'none',
'Sec-Fetch-Mode': 'navigate',
'Sec-Fetch-User': '?1',
'Sec-Fetch-Dest': 'document',
'Accept-Language': 'en-US,en;q=0.9',
'If-None-Match': 'W/"22217b9f695c7148f67bd1b593ba6fa4"',
}
# END
AUTOLAB_URL = 'https://autolab.andrew.cmu.edu/'
# the path where files will be outputted to
OUTPUT_PATH = "~/autolab_assignments/"
def request_autolab(path):
"""
Return the response to the get request to the page of autolab specified by path
"""
if not(path.startswith(AUTOLAB_URL)):
path = requests.compat.urljoin(AUTOLAB_URL, path)
response = requests.get(path, headers=headers, cookies=cookies)
return response
def soup_autolab(path):
"""
Get the soup of the page of autolab specified by path
"""
response = request_autolab(path)
soup = BeautifulSoup(response.text, 'html.parser')
return soup
def get_cards(soup):
"""
Find all divs that are cards in the soup
"""
return soup.findAll("div", {"class": "card"})
def get_card_title(card):
"""
Get the title of the card, where card is a BeautifulSoup object
"""
card_title = card.find("span", {"class": "card-title"})
assert card_title is not None
card_title = slugify(card_title.string)
return card_title
def get_courses():
"""
Get courses
"""
print("GETTING COURSES:")
soup = soup_autolab("/")
cards = get_cards(soup)
cards = list(
filter(
lambda x: x.find(
"div", {
"class": "col s3"}) is None, cards))
courses = []
for c in cards:
course_title = get_card_title(c)
print(course_title)
a = c.find('a', href=True)
course_link = a['href']
print(course_link)
courses.append((course_title, course_link))
return courses
def get_tasks(card):
"""
Get tasks from a card
"""
tasks = []
anchors = card.findAll("a", {"class": "collection-item"}, href=True)
for anchor in anchors:
task_title = slugify(anchor.string)
task_link = anchor['href']
tasks.append((task_title, task_link))
return tasks
def get_assns(soup):
"""
Get assignments from a course page
"""
print("GETTING ASSIGNMENTS")
cards = get_cards(soup)[1:]
assns = []
for c in cards:
assn_title = get_card_title(c)
tasks = get_tasks(c)
assns.append((assn_title, tasks))
return assns
def get_filename(response):
"""
Get the filename from the download link response
"""
if 'Content-Disposition' in response.headers:
filename_matches = re.findall(
r'filename="(.*)"',
response.headers['Content-Disposition'])
assert len(filename_matches) == 1
return filename_matches[0]
else:
return response.url.split("/")[-1]
DOWNLOAD_TITLES = [
"View the assessment writeup",
"Download handout materials and starter code",
"Download Submission",
]
def process_assn(assn, course_title):
"""
Scrape submissions, handouts, and writeups from a course's assignment type
"""
assn_title, tasks = assn
tasks_downloads = []
# for each task, download files from DOWNLOAD_TITLES if they exist
for task_title, task_link in tasks:
task_downloads = []
task_dir = os.path.expanduser(
os.path.join(
OUTPUT_PATH,
course_title,
assn_title,
task_title))
print(assn_title, task_title)
soup = soup_autolab(task_link)
for download_title in DOWNLOAD_TITLES:
download_link_soup = soup.find(
"a", {"title": download_title}, href=True)
assert download_link_soup is not None or download_title == "Download Submission"
if download_link_soup is None:
continue
download_link = download_link_soup['href']
download_response = request_autolab(download_link)
# When the download link does not contain a file, the response
# has Content-Type text/html
if download_response.headers['Content-Type'].startswith(
'text/html'):
continue
filename = get_filename(download_response)
print(filename, download_response.headers['Content-Type'])
with makedirs_cd(task_dir):
with open(filename, 'wb') as f:
f.write(download_response.content)
print("->", os.path.join(task_dir, filename))
task_downloads.append((filename, download_link))
print()
if len(task_downloads) > 0:
tasks_downloads.append((task_title, task_downloads))
def process_course(course):
"""
Scrape submissions, handouts, and writeups from a course
"""
course_title, course_link = course
print()
print("PROCESSING COURSE ", course)
soup = soup_autolab(course_link)
assns = get_assns(soup)
for assn in assns:
process_assn(assn, course_title)
if __name__ == "__main__":
courses = get_courses()
if len(courses) == 0:
print("Error: Autolab authentication failed, please make sure you followed the README instructions to copy over cookies")
for course in courses:
process_course(course)