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import asyncio
import re
from typing import List
import aiohttp
from bs4 import BeautifulSoup
import models
from models import Course, Module, Event, Support, Exam, Download, Contact
class Scraper:
def __init__(self):
self.base_url = 'https://www.fernuni-hagen.de'
self.modules_scraped = {}
async def scrape(self) -> None:
with models.db.transaction() as txn:
Module.delete().execute()
Event.delete().execute()
Support.delete().execute()
Exam.delete().execute()
Download.delete().execute()
Contact.delete().execute()
for course in Course.select():
print(f"Get modules for {course.name}")
await self.fetch_modules(course)
modules = Module.select()
for idx, module in enumerate(modules):
print(f"{idx + 1}/{len(modules)} Get infos for {module.title}")
await self.fetch_modules_infos(module)
txn.commit()
async def fetch_modules(self, course: Course) -> None:
module_links = self.parse_index_page(await self.fetch(course.url))
for module_link in module_links:
Module.get_or_create(number=module_link["number"], title=module_link["title"], url=module_link["url"])
async def fetch_modules_infos(self, module: Module) -> None:
html = await self.fetch(module.url)
self.parse_module_page(html, module)
@staticmethod
async def fetch(url: str) -> str:
async with aiohttp.ClientSession() as session:
req = await session.get(url, ssl=False)
text = await req.read()
return text
def prepare_url(self, url: str) -> str:
if re.search(r"^http(s)*://", url):
return url
elif re.search(r"^/", url):
return self.base_url + url
return self.base_url + "/" + url
def parse_index_page(self, html: str) -> List:
soup = BeautifulSoup(html, "html.parser")
module_links = soup.findAll('a', string=re.compile(r'^[0-9]{5} '))
return [{"title": module_link.get_text()[6:],
"number": int(re.search('^([0-9]+) ', module_link.get_text())[1]),
"url": self.prepare_url(module_link['href']).split("?")[0]}
for module_link in module_links]
def parse_module_page(self, html: str, module: Module) -> None:
soup = BeautifulSoup(html, "html.parser")
info = self.parse_info(soup)
Module.update(ects=info["ects"], effort=info["effort"], duration=info["duration"], interval=info["interval"],
notes=info["notes"], requirements=info["requirements"]).where(
Module.number == module.number).execute()
for event in self.parse_events(soup):
Event.create(name=event["name"], number=event["number"], url=event["url"], module=module)
for support_item in self.parse_support(soup):
Support.create(title=support_item["title"], city=support_item["city"], url=support_item["url"],
module=module)
for exam in self.parse_exams(soup):
Exam.create(name=exam["name"], type=exam["type"], requirements=exam["requirements"],
hard_requirements=exam["hard_requirements"], module=module)
for download in self.parse_downloads(soup):
models.Download.create(title=download["title"], url=download["url"], module=module)
for contact in self.parse_contacts(soup):
models.Contact.create(name=contact, module=module)
def parse_info(self, soup):
try:
info_source = soup.find(summary='Modulinformationen')
except:
return None
if info_source is None:
return None
return {
"ects": self.get_info(info_source, 'ECTS'),
"effort": self.get_info(info_source, 'Arbeitsaufwand'),
"duration": self.get_info(info_source, 'Dauer des Moduls'),
"interval": self.get_info(info_source, 'Häufigkeit des Moduls'),
"notes": self.get_info(info_source, 'Anmerkung'),
"requirements": self.get_info(info_source, 'Inhaltliche Voraussetzung')
}
def get_info(self, info_source, title):
th = info_source.find('th', string=title)
if th is not None:
td = th.findNext('td')
if td is not None:
return td.get_text()
return None
def parse_events(self, soup):
try:
course_source = soup.find('h2', string=re.compile(r'Aktuelles Angebot')) \
.findNext('div') \
.findAll('a')
return [{"name": re.sub('^Kurs [0-9]+ ', '', link.get_text()),
"number": re.sub('^0+', '', re.search('([^/]+)$', link['href'])[1]),
"url": self.prepare_url(link['href'])} for link in course_source]
except:
return []
def parse_support(self, soup):
try:
support_source = soup.find('h2', string=re.compile(
r'Mentorielle Betreuung an den Campusstandorten')).findNext('ul').findAll('li')
except:
support_source = []
return [{"title": item.get_text(), "city": item.find('a').get_text(),
"url": self.prepare_url(item.find('a')['href'])} for item in support_source]
@staticmethod
def parse_exams(soup):
try:
exam_source = soup.find(summary='Prüfungsinformationen')
except:
return []
stg = exam_source.findNext('th', colspan='2')
exams = []
while stg != None:
exam = {
"name": stg.get_text(),
"type": stg.findNext('th', string='Art der Prüfungsleistung').findNext('td').get_text(),
"requirements": stg.findNext('th', string='Voraussetzung').findNext('td').get_text(),
# "weight": stg.findNext('th', string='Stellenwert der Note').findNext('td').get_text(),
"hard_requirements": stg.findNext('th', string='Formale Voraussetzungen').findNext('td').get_text()
}
exams.append(exam)
stg = stg.findNext('th', colspan='2')
return exams
def parse_downloads(self, soup):
try:
downloads = soup.find('h2', string=re.compile(r'Download')) \
.findNext('ul', attrs={'class': 'pdfliste'}) \
.findAll('li')
except:
downloads = []
return [{"title": download.find('a').get_text(),
"url": self.prepare_url(download.find('a')['href'])}
for download in downloads]
@staticmethod
def parse_contacts(soup):
try:
contacts = soup.find('h2', string=re.compile(
r'Ansprechpersonen')).findNext('ul').findAll('h4')
except:
return []
return [contact.get_text() for contact in contacts]
if __name__ == "__main__":
scraper = Scraper()
asyncio.run(scraper.scrape())