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from bs4 import BeautifulSoup
import requests
from selenium.webdriver import Chrome
from selenium.webdriver.chrome.options import Options
import os
dir_path = os.path.dirname(os.path.realpath(__file__))
SAVE_PATH = dir_path + '/prescraped/codeforces/'
scraped_problems = os.listdir(SAVE_PATH + "Problems")
scraped_editorials = os.listdir(SAVE_PATH + "Editorials")
def anti_scrape(soup):
if soup.text == "Just a moment...Enable JavaScript and cookies to continue":
print("Bypassing anti-scrap protection...")
scr = soup.findAll("script")[-1].string
print(scr)
scr = scr[scr.index("var a=toNumbers"):].split(';')
line = scr[0]
abc = []
while "toNumbers" in line:
i = line.index("toNumbers")
line = line[i+11:]
abc.append(line[:line.index('"')])
from Crypto.Cipher import AES
def to_numbers(x):
return bytes(int(x[i:i+2], 16) for i in range(0, len(x), 2))
key, iv, cipher = map(to_numbers, abc)
aes = AES.new(key, AES.MODE_CBC, iv)
rcpc = aes.decrypt(cipher).hex()
print(f"RCPC = {rcpc}")
url = scr[-2]
url = url[url.index('"')+1:-1]
r = requests.get(url, cookies={"RCPC": rcpc})
s = r.text
soup = BeautifulSoup(s, "html.parser")
def read(file_path):
res = ""
with open(file_path, 'r') as f:
res = f.read()
return res
def from_url(url):
pid = url.split('/')[-3:]
pid.remove('problem')
pid = ''.join(pid);
return pid
def problem(url):
pid = from_url(url)
if (pid in scraped_problems):
statement = read(SAVE_PATH + "Problems/" + pid)
if (len(statement)):
return {"statement": statement}
chrome_options = Options()
chrome_options.add_argument("--headless") # Opens the browser up in background
with Chrome(options=chrome_options) as browser:
browser.get(url)
response = browser.page_source
# response = requests.get(url)
soup = BeautifulSoup(response, 'html.parser')
# anti_scrape(soup)
problem_statements = soup.find_all(class_='problem-statement')
# print(p)
for statement in problem_statements:
# title
title = statement.find(class_='title').text.strip()
# time limit
time_limit = statement.find(class_='time-limit').text.strip().replace('time limit per test', '')
# memory limit
memory_limit = statement.find(class_='memory-limit').text.strip().replace('memory limit per test', '')
# Fails for interactives (and presumably output only's)
# # input format
# input_spec = statement.find(class_='input-specification').text.strip().replace('Input', '')
# # print("Input Specification:", input_spec)
# # output format
# output_spec = statement.find(class_='output-specification').text.strip().replace('Output', '')
# # print("Output Specification:", output_spec)
problem = ""
for child in statement.children:
if child.name == 'div' and ('input-specification' in child.get('class', [])):
break
if child.name == 'div' and ('header' not in child.get('class', [])):
problem += child.text.strip()
# sample inputs
examples = statement.find(class_='sample-tests')
input_tests = examples.find_all(class_='test-example-line')
inputs = ""
for i in input_tests:
input_example_lines = i.text.strip()
inputs += input_example_lines
inputs += '\n'
# sample outputs
output_tests = examples.find_all(class_='output')
outputs = ""
# print(output_tests.text.strip())
for i in output_tests:
output_example_lines = i.text.strip().replace('Output\n', '')
outputs += output_example_lines
outputs += '\n'
note = statement.find(class_='note')
notes = ""
if note:
note_text = note.text.strip().replace('Note', '')
notes += note_text
# print("Note:", note_text)
data = {
"title": title,
"time_limit": time_limit,
"memory_limit": memory_limit,
# "input_format": input_spec,
# "output_format": output_spec,
"statement": problem,
"sample_input": inputs,
"sample_outputs": outputs,
"note": notes
}
with open(SAVE_PATH + 'Problems/' + pid, 'w') as f:
f.write(data["statement"])
scraped_problems.append(pid)
return data
def editorial(prob_url, edi_url, bot=None, query_func=None):
pid = from_url(prob_url)
if (pid in scraped_editorials):
edi = read(SAVE_PATH + "Editorials/" + pid)
if (len(edi)):
return edi
domain = 'https://codeforces.com/'
if (domain in prob_url):
prob_url=prob_url[len(domain):]
if ('problemset/problem/' in prob_url):
# print(prob_url)
prob_url=prob_url[len('problemset/problem/'):]
# print(prob_url)
prob_url = 'contest/' + '/problem/'.join(prob_url.split('/'))
chrome_options = Options()
chrome_options.add_argument("--headless") # Opens the browser up in background
with Chrome(options=chrome_options) as browser:
browser.get(edi_url)
response = browser.page_source
soup = BeautifulSoup(response, 'html.parser')
# anti_scrape(soup)
soup = soup.find_all(class_='content')[0]
while soup.pre != None: # removes all code
soup.pre.decompose()
edi = []
on = False # checks what problem we're on
contest_url = '/'.join(prob_url.split('/')[:-1])
for tag in soup.find_all(['p', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'li', 'center', 'b']):
links = tag.find_all(href=True)
# if (len(links)):
# print(links[0].prettify())
# print(prob_url)
# print(contest_url)
if (len(links) > 0 and prob_url in links[0].prettify()):
on=True
elif len(links) > 0 and contest_url in links[0].prettify():
on = False
elif on:
latex_content = ""
for elem in tag.descendants: # In case LaTeX doesn't render automatically with bs4
if (elem.find_parent().name != 'p' and elem.find_parent().name != 'a' and elem.find_parent().name !='b' and elem.find_parent().name != 'center' and elem.find_parent().name != 'li'):
continue
bold = elem.find_parent().name == 'b'
if isinstance(elem, str):
if ('code' in elem.lower() and bold):
continue
latex_content += '**' * bold + elem + '**' * bold
elif elem.name == "script" and elem.get("type") == "math/tex":
latex_content += "$$$" + elem.string + "$$$"
edi.append(latex_content)
edi = '\n'.join(edi)
# print('bot', bot)
# if (bot):
# edi = bot.chat(query_func(problem(prob_url), edi))
with open(SAVE_PATH + 'Editorials/' + pid, 'w') as f:
f.write(edi)
scraped_editorials.append(pid)
return edi
# print(problem('https://codeforces.com/problemset/problem/1985/G'))
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