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scraper.py
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scraper.py
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import asyncio
import datetime
import ipaddress
import logging
import socket
import aiohttp
import tldextract
logger = logging.getLogger()
logging.basicConfig(level=logging.INFO, format="%(message)s")
default_headers: dict = {
"Connection": "keep-alive",
"Accept": "*/*",
}
def current_datetime_str() -> str:
"""Current time's datetime string in UTC
Returns:
str: Timestamp in strftime format "%d_%b_%Y_%H_%M_%S-UTC".
"""
return datetime.datetime.now(datetime.UTC).strftime("%d_%b_%Y_%H_%M_%S-UTC")
async def backoff_delay_async(
backoff_factor: float, number_of_retries_made: int
) -> None:
"""Asynchronous time delay that exponentially increases with `number_of_retries_made`
Args:
backoff_factor (float): Backoff delay multiplier
number_of_retries_made (int): More retries made -> Longer backoff delay
"""
await asyncio.sleep(backoff_factor * (2 ** (number_of_retries_made - 1)))
async def get_async(
endpoints: list[str], max_concurrent_requests: int = 5, headers: dict | None = None
) -> dict[str, bytes]:
"""Given a list of HTTP endpoints, make HTTP GET requests asynchronously
Args:
endpoints (list[str]): List of HTTP GET request endpoints
max_concurrent_requests (int, optional): Maximum number of concurrent async HTTP requests.
Defaults to 5.
headers (dict, optional): HTTP Headers to send with every request. Defaults to None.
Returns:
dict[str,bytes]: Mapping of HTTP GET request endpoint to its HTTP response content. If
the GET request failed, its HTTP response content will be `b"{}"`
"""
if headers is None:
headers = default_headers
async def gather_with_concurrency(
max_concurrent_requests: int, *tasks
) -> dict[str, bytes]:
semaphore = asyncio.Semaphore(max_concurrent_requests)
async def sem_task(task):
async with semaphore:
await asyncio.sleep(0.5)
return await task
tasklist = [sem_task(task) for task in tasks]
return dict([await f for f in asyncio.as_completed(tasklist)])
async def get(url, session):
max_retries: int = 8
errors: list[str] = []
for number_of_retries_made in range(max_retries):
try:
async with session.get(url, headers=headers) as response:
return (url, await response.read())
except Exception as error:
errors.append(repr(error))
logger.warning(
"%s | Attempt %d failed", error, number_of_retries_made + 1
)
if (
number_of_retries_made != max_retries - 1
): # No delay if final attempt fails
await backoff_delay_async(1, number_of_retries_made)
logger.error("URL: %s GET request failed! Errors: %s", url, errors)
return (url, b"{}") # Allow json.loads to parse body if request fails
# GET request timeout of 15 seconds
async with aiohttp.ClientSession(
connector=aiohttp.TCPConnector(limit=0, ttl_dns_cache=15),
raise_for_status=True,
timeout=aiohttp.ClientTimeout(total=15),
) as session:
# Only one instance of any duplicate endpoint will be used
return await gather_with_concurrency(
max_concurrent_requests, *[get(url, session) for url in set(endpoints)]
)
async def extract_urls():
endpoint = "https://www.usom.gov.tr/url-list.txt"
data = (await get_async([endpoint]))[endpoint]
non_ips: set[str] = set()
ips: set[str] = set()
fqdns: set[str] = set()
registered_domains: set[str] = set()
if data != b"{}":
urls = data.decode().split("\n")
for url in urls:
url = url.strip()
res = tldextract.extract(url)
registered_domain, domain, fqdn = (
res.registered_domain,
res.domain,
res.fqdn,
)
if domain and not fqdn:
# Possible IPv4 Address
try:
socket.inet_pton(socket.AF_INET, domain)
ips.add(domain)
except socket.error:
if url:
non_ips.add(url)
elif fqdn:
non_ips.add(url)
fqdns.add(fqdn)
registered_domains.add(registered_domain)
if not non_ips and not ips:
logger.error("No URLs found.")
else:
non_ips_timestamp: str = current_datetime_str()
non_ips_filename = "urls.txt"
with open(non_ips_filename, "w") as f:
f.write("\n".join(sorted(non_ips)))
logger.info(
"%d URLs written to %s at %s",
len(non_ips),
non_ips_filename,
non_ips_timestamp,
)
ips_timestamp: str = current_datetime_str()
ips_filename = "ips.txt"
with open(ips_filename, "w") as f:
f.write("\n".join(sorted(ips, key=ipaddress.IPv4Address)))
logger.info(
"%d IPs written to %s at %s",
len(ips),
ips_filename,
ips_timestamp,
)
fqdns_timestamp: str = current_datetime_str()
fqdns_filename = "urls_pihole.txt"
with open(fqdns_filename, "w") as f:
f.writelines("\n".join(sorted(fqdns)))
logger.info(
"%d FQDNs written to %s at %s",
len(fqdns),
fqdns_filename,
fqdns_timestamp,
)
registered_domains_timestamp: str = current_datetime_str()
registered_domains_filename = "urls_UBL.txt"
with open(registered_domains_filename, "w") as f:
f.writelines("\n".join(f"*://*.{r}/*" for r in sorted(registered_domains)))
logger.info(
"%d Registered Domains written to %s at %s",
len(registered_domains),
registered_domains_filename,
registered_domains_timestamp,
)
if __name__ == "__main__":
asyncio.run(extract_urls())